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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/9811207 | Andrei Kondashov | Andrei Kondashov | A study of the pi^0pi^0 system produced in charge exchange and central
collisions | 6 pages, 6 figures, use file stwol.sty, presented at International
High-Energy Physics Euroconference in Quantum Chromodynamics, 2-8 July 1998,
Montpellier, France on behalf of the GAMS and WA102 Collaborations | Nucl.Phys.Proc.Suppl. 74 (1999) 180-185 | 10.1016/S0920-5632(99)00158-9 | null | hep-ph | null | A study of the $\pi^0\pi^0$ system produced in charge exchange $\pi^-p$
collisions at 38 and 100 GeV/c and in central $pp$ interactions at 450 GeV/c
has been carried out. The $S$ wave has rather a complicated structure in both
processes indicating the existence of several scalar resonances. The $f_0(980)$
and $f_0(1500)$ appear as dips at 1 and 1.5 GeV in the $S$ wave for charge
exchange reaction, and as shoulders at these masses in the $S$ wave for central
production. The production of the $f_0(980)$, $f_0(1300)$ and $f_0(1500)$ in
the reaction $pp \to p_f\pi^0\pi^0p_s$ as a function of the $dP_{T}$
kinematical filter shows the behaviour differed from what has been observed for
the undisputed $q\bar{q}$ mesons. An extra $f_0(2000)$ state is seen in the $S$
wave for charge exchange reaction as a dip at 2 GeV. Resonances with higher
spins, $f_2(1270)$, $f_4(2050)$ and $f_6(2510)$, have also been studied. All
the three mesons are produced in the reaction $\pi^-p\to\pi^0\pi^0{n}$ mainly
via an one-pion exchange for small $-t$, whereas a natural-parity exchange
domimates for large $-t$. The behaviour of the centrally produced $f_2(1270)$
as a function of the $dP_{T}$ is consistent with what has been observed for
other $q\bar{q}$ states.
| [
{
"created": "Sun, 1 Nov 1998 08:04:51 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Kondashov",
"Andrei",
""
]
] | A study of the $\pi^0\pi^0$ system produced in charge exchange $\pi^-p$ collisions at 38 and 100 GeV/c and in central $pp$ interactions at 450 GeV/c has been carried out. The $S$ wave has rather a complicated structure in both processes indicating the existence of several scalar resonances. The $f_0(980)$ and $f_0(1500)$ appear as dips at 1 and 1.5 GeV in the $S$ wave for charge exchange reaction, and as shoulders at these masses in the $S$ wave for central production. The production of the $f_0(980)$, $f_0(1300)$ and $f_0(1500)$ in the reaction $pp \to p_f\pi^0\pi^0p_s$ as a function of the $dP_{T}$ kinematical filter shows the behaviour differed from what has been observed for the undisputed $q\bar{q}$ mesons. An extra $f_0(2000)$ state is seen in the $S$ wave for charge exchange reaction as a dip at 2 GeV. Resonances with higher spins, $f_2(1270)$, $f_4(2050)$ and $f_6(2510)$, have also been studied. All the three mesons are produced in the reaction $\pi^-p\to\pi^0\pi^0{n}$ mainly via an one-pion exchange for small $-t$, whereas a natural-parity exchange domimates for large $-t$. The behaviour of the centrally produced $f_2(1270)$ as a function of the $dP_{T}$ is consistent with what has been observed for other $q\bar{q}$ states. |
hep-ph/9906544 | Gevorg H. Arakelian | G.H.Arakelyan | Hadroproduction of particle with open charm | Talk presented at XXXIV Recontres de Moriond "QCD and High Energy
Hadronic Interactions", Les Arcs, France, March 20-27, 1999; Latex, 7 pages,
4 figs. in ps format | null | null | null | hep-ph | null | In the framework of Quark-Gluon-String Model (QGSM) we calculate the
inclusive spectra of meson and baryons with open charm in hadron-hadron
collisions, obtained by SELEX and BEATRICE collaborations, taking into account
the decays of corresponding S-wave resonances.
| [
{
"created": "Wed, 30 Jun 1999 09:28:22 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Arakelyan",
"G. H.",
""
]
] | In the framework of Quark-Gluon-String Model (QGSM) we calculate the inclusive spectra of meson and baryons with open charm in hadron-hadron collisions, obtained by SELEX and BEATRICE collaborations, taking into account the decays of corresponding S-wave resonances. |
hep-ph/9411403 | null | Mariano Quir\'os | Bounds on the Higgs Mass in the Standard Model and Minimal
Supersymmetric Standard Model | Based on talk given at "Physics from Planck scale to electroweak
scale", Warsaw, Poland 21-24 September 1994, 13 pages, latex, 5 postscript
figures included in the text by PSFIG.STY appended uuencoded compressed | null | null | CERN-TH.7507/94 | hep-ph | null | We present bounds on the Higgs mass in the Standard Model and in the Minimal
Supersymmetric Standard Model using the effective potential with
next-to-leading logarithms resummed by the renormalization group equations, and
physical (pole) masses for the top quark and Higgs boson. In the Standard Model
we obtain lower bounds from stability requirements: they depend on the top mass
and the cutoff scale. In the Minimal Supersymmetric Standard Model we obtain
upper bounds which depend on the top mass and the scale of supersymmetry
breaking. A Higgs mass measurement could discriminate, depending on the top
mass, between the two models. Higgs discovery at LEP-200 can put an upper bound
on the scale of new physics.
| [
{
"created": "Sat, 26 Nov 1994 19:51:37 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Quirós",
"Mariano",
""
]
] | We present bounds on the Higgs mass in the Standard Model and in the Minimal Supersymmetric Standard Model using the effective potential with next-to-leading logarithms resummed by the renormalization group equations, and physical (pole) masses for the top quark and Higgs boson. In the Standard Model we obtain lower bounds from stability requirements: they depend on the top mass and the cutoff scale. In the Minimal Supersymmetric Standard Model we obtain upper bounds which depend on the top mass and the scale of supersymmetry breaking. A Higgs mass measurement could discriminate, depending on the top mass, between the two models. Higgs discovery at LEP-200 can put an upper bound on the scale of new physics. |
2304.05711 | Naser Ahmadiniaz | Naser Ahmadiniaz, Rashid Shaisultanov, and Ralf Sch\"utzhold | Assisted neutrino pair production in combined external fields | 7 pages, 2 figures, minor improvements, matches published version | null | 10.1103/PhysRevD.108.036003 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Neutrino--antineutrino ($\nu\bar\nu$) pair production is one of the main
processes responsible for the energy loss of stars. Apart from the collision of
two ($\gamma\gamma\to\nu\bar\nu$) or three ($\gamma\gamma\gamma\to\nu\bar\nu$)
real photons, pair creation from a photon and photon collisions in the presence
of nuclear Coulomb fields or external magnetic fields have been considered
previously. Here, we study a pair production of neutrino and antineutrino from
a low-energy photon in the presence of a combined homogeneous magnetic field
and the Coulomb field of a nucleus with charge number $Z$.
| [
{
"created": "Wed, 12 Apr 2023 09:05:54 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Aug 2023 07:43:22 GMT",
"version": "v2"
}
] | 2023-08-29 | [
[
"Ahmadiniaz",
"Naser",
""
],
[
"Shaisultanov",
"Rashid",
""
],
[
"Schützhold",
"Ralf",
""
]
] | Neutrino--antineutrino ($\nu\bar\nu$) pair production is one of the main processes responsible for the energy loss of stars. Apart from the collision of two ($\gamma\gamma\to\nu\bar\nu$) or three ($\gamma\gamma\gamma\to\nu\bar\nu$) real photons, pair creation from a photon and photon collisions in the presence of nuclear Coulomb fields or external magnetic fields have been considered previously. Here, we study a pair production of neutrino and antineutrino from a low-energy photon in the presence of a combined homogeneous magnetic field and the Coulomb field of a nucleus with charge number $Z$. |
1103.3016 | Patrick Meade | Patrick Meade, Michele Papucci, Tomer Volansky | Odd Tracks at Hadron Colliders | 6 pages, 1 figure | null | 10.1103/PhysRevLett.109.031801 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | New physics that exhibits irregular tracks such as kinks, intermittent hits
or decay in flight may easily be missed at hadron colliders. We demonstrate
this by studying viable models of light, O(10 GeV), colored particles that
decay predominantly inside the tracker. Such particles can be produced at
staggering rates, and yet may not be identified or even triggered on at the
LHC, unless specifically searched for. In addition, the models we study provide
an explanation for the original measurement of the anomalous charged track
distribution by CDF. The presence of irregular tracks in these models reconcile
that measurement with the subsequent reanalysis and the null results of ATLAS
and CMS. Our study clearly illustrates the need for a comprehensive study of
irregular tracks at the LHC.
| [
{
"created": "Tue, 15 Mar 2011 20:03:28 GMT",
"version": "v1"
}
] | 2015-05-27 | [
[
"Meade",
"Patrick",
""
],
[
"Papucci",
"Michele",
""
],
[
"Volansky",
"Tomer",
""
]
] | New physics that exhibits irregular tracks such as kinks, intermittent hits or decay in flight may easily be missed at hadron colliders. We demonstrate this by studying viable models of light, O(10 GeV), colored particles that decay predominantly inside the tracker. Such particles can be produced at staggering rates, and yet may not be identified or even triggered on at the LHC, unless specifically searched for. In addition, the models we study provide an explanation for the original measurement of the anomalous charged track distribution by CDF. The presence of irregular tracks in these models reconcile that measurement with the subsequent reanalysis and the null results of ATLAS and CMS. Our study clearly illustrates the need for a comprehensive study of irregular tracks at the LHC. |
hep-ph/0410251 | Marc Vanderhaeghen | M. Guidal, M. V. Polyakov, A. V. Radyushkin, M. Vanderhaeghen | Nucleon Form Factors from Generalized Parton Distributions | 18 pages, 5 figures, replaced with published version | Phys.Rev.D72:054013,2005 | 10.1103/PhysRevD.72.054013 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the links between Generalized Parton Distributions (GPDs) and
elastic nucleon form factors. These links, in the form of sum rules, represent
powerful constraints on parametrizations of GPDs. A Regge parametrization for
GPDs at small momentum transfer, is extended to the large momentum transfer
region and it is found to describe the basic features of proton and neutron
electromagnetic form factor data. This parametrization is used to estimate the
quark contribution to the nucleon spin.
| [
{
"created": "Mon, 18 Oct 2004 18:45:09 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Aug 2009 14:55:56 GMT",
"version": "v2"
}
] | 2009-08-06 | [
[
"Guidal",
"M.",
""
],
[
"Polyakov",
"M. V.",
""
],
[
"Radyushkin",
"A. V.",
""
],
[
"Vanderhaeghen",
"M.",
""
]
] | We discuss the links between Generalized Parton Distributions (GPDs) and elastic nucleon form factors. These links, in the form of sum rules, represent powerful constraints on parametrizations of GPDs. A Regge parametrization for GPDs at small momentum transfer, is extended to the large momentum transfer region and it is found to describe the basic features of proton and neutron electromagnetic form factor data. This parametrization is used to estimate the quark contribution to the nucleon spin. |
1204.2300 | Christopher Bignamini Dr. | C. Bignamini, F. Becattini, F. Piccinini | A Monte-Carlo generator for statistical hadronization in high energy
e+e- collisions | 19 pages, 28 figures, 6 tables. v2: added sections on comparison
between the Statistical Hadronization Model and the Cluster Model and on the
interplay between Herwig cluster splitting algorithm and Statistical
Hadronization Model predictions. Fixed typos and references added. Version
accepted for publication in EPJC | Eur. Phys. J. C 72:2176, 2012 | 10.1140/epjc/s10052-012-2176-x | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a Monte-Carlo implementation of the Statistical Hadronization
Model in e+e- collisions. The physical scheme is based on the statistical
hadronization of massive clusters produced by the event generator Herwig within
the microcanonical ensemble. We present a preliminary comparison of several
observables with measurements in e+e- collisions at the Z peak. Although a fine
tuning of the model parameters is not carried out, a general good agreement
between its predictions and data is found.
| [
{
"created": "Tue, 10 Apr 2012 22:57:57 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Oct 2012 20:22:07 GMT",
"version": "v2"
}
] | 2015-06-04 | [
[
"Bignamini",
"C.",
""
],
[
"Becattini",
"F.",
""
],
[
"Piccinini",
"F.",
""
]
] | We present a Monte-Carlo implementation of the Statistical Hadronization Model in e+e- collisions. The physical scheme is based on the statistical hadronization of massive clusters produced by the event generator Herwig within the microcanonical ensemble. We present a preliminary comparison of several observables with measurements in e+e- collisions at the Z peak. Although a fine tuning of the model parameters is not carried out, a general good agreement between its predictions and data is found. |
2301.10254 | Roshan Mammen Abraham | Roshan Mammen Abraham, Saeid Foroughi-Abari, Felix Kling, Yu-Dai Tsai | Neutrino Electromagnetic Properties and the Weak Mixing Angle at the LHC
Forward Physics Facility | 14 pages, 3 figures, 1 table | null | null | DESY-22-196, UCI-HEP-TR-2022-06 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The LHC produces an intense beam of highly energetic neutrinos of all three
flavors in the forward direction, and the Forward Physics Facility (FPF) has
been proposed to house a suite of experiments taking advantage of this
opportunity. In this study, we investigate the FPF's potential to probe the
neutrino electromagnetic properties, including neutrino millicharge, magnetic
moment, and charge radius. We find that, due to the large flux of tau neutrinos
at the LHC, the FPF detectors will be able to provide the strongest
laboratory-based sensitivity to the tau neutrino magnetic moment and
millicharge by searching for excess in low recoil energy electron scattering
events. We also find that, by precisely measuring the rate of neutral current
deep inelastic scattering events, the FPF detectors have the potential to
obtain the strongest experimental bounds on the neutrino charge radius for the
electron neutrino, and one of the leading bounds for the muon neutrino flavor.
The same signature could also be used to measure the weak mixing angle, and we
estimate that $\sin^2 \theta_W$ could be measured to about $3\%$ precision at a
scale $Q \sim 10$ GeV, shedding new light on the long-standing NuTeV anomaly.
| [
{
"created": "Tue, 24 Jan 2023 19:00:01 GMT",
"version": "v1"
}
] | 2023-01-26 | [
[
"Abraham",
"Roshan Mammen",
""
],
[
"Foroughi-Abari",
"Saeid",
""
],
[
"Kling",
"Felix",
""
],
[
"Tsai",
"Yu-Dai",
""
]
] | The LHC produces an intense beam of highly energetic neutrinos of all three flavors in the forward direction, and the Forward Physics Facility (FPF) has been proposed to house a suite of experiments taking advantage of this opportunity. In this study, we investigate the FPF's potential to probe the neutrino electromagnetic properties, including neutrino millicharge, magnetic moment, and charge radius. We find that, due to the large flux of tau neutrinos at the LHC, the FPF detectors will be able to provide the strongest laboratory-based sensitivity to the tau neutrino magnetic moment and millicharge by searching for excess in low recoil energy electron scattering events. We also find that, by precisely measuring the rate of neutral current deep inelastic scattering events, the FPF detectors have the potential to obtain the strongest experimental bounds on the neutrino charge radius for the electron neutrino, and one of the leading bounds for the muon neutrino flavor. The same signature could also be used to measure the weak mixing angle, and we estimate that $\sin^2 \theta_W$ could be measured to about $3\%$ precision at a scale $Q \sim 10$ GeV, shedding new light on the long-standing NuTeV anomaly. |
2104.04640 | Miguel Angel Martin Contreras Dr. | Miguel Angel Martin Contreras, Eduardo Folco Capossoli, Danning Li,
Alfredo Vega, Henrique Boschi-Filho | Pion form factor from an AdS deformed background | V1, 23 pages, 4 figures | Nucl. Phys. B, 977 (2022), 115726 | 10.1016/j.nuclphysb.2022.115726 | null | hep-ph hep-th nucl-th | http://creativecommons.org/licenses/by/4.0/ | We consider a bottom-up AdS/QCD model with a conformal exponential
deformation $e^{k\,z^2}$ on a Lorentz invariant AdS background. In this model,
we assume the conformal dimension associated with the operator that creates
pions at the boundary as $\Delta=3$. Regarding the infrared scale related to
photon field $k_\gamma$, we analyze two cases: constant and depending on the
transferred momentum $q$. In these two cases, we computed the electromagnetic
pion form factor as well as the pion radius. We compare our results with
experimental data as well as other theoretical (holographic and
non-holographic) models. In particular, for the momentum-dependent infrared
scale, we find good agreement with the available experimental data as well as
non-holographic models.
| [
{
"created": "Fri, 9 Apr 2021 23:38:44 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Mar 2022 21:08:39 GMT",
"version": "v2"
}
] | 2022-03-29 | [
[
"Contreras",
"Miguel Angel Martin",
""
],
[
"Capossoli",
"Eduardo Folco",
""
],
[
"Li",
"Danning",
""
],
[
"Vega",
"Alfredo",
""
],
[
"Boschi-Filho",
"Henrique",
""
]
] | We consider a bottom-up AdS/QCD model with a conformal exponential deformation $e^{k\,z^2}$ on a Lorentz invariant AdS background. In this model, we assume the conformal dimension associated with the operator that creates pions at the boundary as $\Delta=3$. Regarding the infrared scale related to photon field $k_\gamma$, we analyze two cases: constant and depending on the transferred momentum $q$. In these two cases, we computed the electromagnetic pion form factor as well as the pion radius. We compare our results with experimental data as well as other theoretical (holographic and non-holographic) models. In particular, for the momentum-dependent infrared scale, we find good agreement with the available experimental data as well as non-holographic models. |
1202.4599 | Andrzej Bialas | A.Bialas | Wounded Constituents | 14 pages, 2 figures | Published: Acta Physica Polonica B43 (2012) 95 | 10.5506/APhysPolB.43.95 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The concept of the "wounded" hadronic constituents is formulated. Preliminary
estimates indicate that it may help to understand the transverse mass
dependence of particle production in hadron-nucleus and nucleus-nucleus
collisions.
| [
{
"created": "Tue, 21 Feb 2012 11:21:41 GMT",
"version": "v1"
}
] | 2012-02-22 | [
[
"Bialas",
"A.",
""
]
] | The concept of the "wounded" hadronic constituents is formulated. Preliminary estimates indicate that it may help to understand the transverse mass dependence of particle production in hadron-nucleus and nucleus-nucleus collisions. |
hep-ph/0605298 | Saurabh D. Rindani | Kumar Rao and Saurabh D. Rindani | Probing CP-violating contact interactions in e+e- --> HZ with polarized
beams | 22 pages latex, 9 figures included in submission | Phys.Lett.B642:85-92,2006 | 10.1016/j.physletb.2006.07.072 | null | hep-ph | null | We examine very general four-point interactions arising due to new physics
contributing to the Higgs production process e+e- --> HZ. We write all possible
forms for these interactions consistent with Lorentz invariance. We allow the
possibility of CP violation. Contributions to the process from anomalous ZZH
and gammaZH interactions studied earlier arise as a special case of our
four-point amplitude. Expressions for polar and azimuthal angular distributions
of Z arising from the interference of the four-point contribution with the
standard-model contribution in the presence of longitudinal and transverse beam
polarization are obtained. An interesting CP-odd and T-odd contribution is
found to be present only when both electron and positron beams are transversely
polarized. Such a contribution is absent when only anomalous ZZH and gammaZH
interactions are considered. We show how angular asymmetries can be used to
constrain CP-odd interactions at a linear collider operating at a
centre-of-mass energy of 500 GeV with transverse beam polarization.
| [
{
"created": "Sat, 27 May 2006 07:28:20 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Rao",
"Kumar",
""
],
[
"Rindani",
"Saurabh D.",
""
]
] | We examine very general four-point interactions arising due to new physics contributing to the Higgs production process e+e- --> HZ. We write all possible forms for these interactions consistent with Lorentz invariance. We allow the possibility of CP violation. Contributions to the process from anomalous ZZH and gammaZH interactions studied earlier arise as a special case of our four-point amplitude. Expressions for polar and azimuthal angular distributions of Z arising from the interference of the four-point contribution with the standard-model contribution in the presence of longitudinal and transverse beam polarization are obtained. An interesting CP-odd and T-odd contribution is found to be present only when both electron and positron beams are transversely polarized. Such a contribution is absent when only anomalous ZZH and gammaZH interactions are considered. We show how angular asymmetries can be used to constrain CP-odd interactions at a linear collider operating at a centre-of-mass energy of 500 GeV with transverse beam polarization. |
hep-ph/0404036 | Boris Kopeliovich | B.Z. Kopeliovich, B. Povh | Small Gluonic Spots in the Nucleon: Searching for Signatures in Data | Talk given by B. Povh at the Quark Matter 2004 | J.Phys.G30:S999-S1002,2004 | 10.1088/0954-3899/30/8/046 | null | hep-ph | null | Nuclear shadowing and color glass condensate are possible only at
sufficiently small x where parton clouds of different nucleons overlap in the
longitudinal direction. Another condition vital for these effect, an overlap of
partons in impact parameters, is not easy to fulfill for gluons which are
located within small spots, as follows from the observed weakness of
diffractive gluon radiation (smallness of the triple-Pomeron coupling). The
predicted weakness of the leading twist gluon shadowing has been confirmed
recently by data for J/Psi production and Cronin effect in d-Au collisions at
RHIC. Smallness of gluonic spots also leads to a rather low value of the slope
of the Pomeron trajectory, confirmed by ZEUS data on elastic photoproduction of
J/Psi. At the same time, saturation of unitarity for central pp collisions
leads to a substantial increase of the Pomeron slope in good agreement with
elastic pp data.
| [
{
"created": "Sun, 4 Apr 2004 19:46:20 GMT",
"version": "v1"
}
] | 2010-11-30 | [
[
"Kopeliovich",
"B. Z.",
""
],
[
"Povh",
"B.",
""
]
] | Nuclear shadowing and color glass condensate are possible only at sufficiently small x where parton clouds of different nucleons overlap in the longitudinal direction. Another condition vital for these effect, an overlap of partons in impact parameters, is not easy to fulfill for gluons which are located within small spots, as follows from the observed weakness of diffractive gluon radiation (smallness of the triple-Pomeron coupling). The predicted weakness of the leading twist gluon shadowing has been confirmed recently by data for J/Psi production and Cronin effect in d-Au collisions at RHIC. Smallness of gluonic spots also leads to a rather low value of the slope of the Pomeron trajectory, confirmed by ZEUS data on elastic photoproduction of J/Psi. At the same time, saturation of unitarity for central pp collisions leads to a substantial increase of the Pomeron slope in good agreement with elastic pp data. |
2011.08235 | Mauricio Martinez | A. Behtash, S. Kamata, M. Martinez, T. Schaefer and V. Skokov | Transasymptotics and hydrodynamization of the Fokker-Planck equation for
gluons | v2: 23 pages + appendices, 7 figures, updated references. Added new
subsection IVB which is related with transasymptotic matching and RG flow
equations of 1st. and 2nd. order transport coefficients for the most general
case. Accepted for publication in PRD | Phys. Rev. D 103, 056010 (2021) | 10.1103/PhysRevD.103.056010 | null | hep-ph cond-mat.stat-mech hep-th nucl-th physics.flu-dyn | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the non-linear transport processes and hydrodynamization of a
system of gluons undergoing longitudinal boost-invariant expansion. The
dynamics is described within the framework of the Boltzmann equation in the
small-angle approximation. The kinetic equations for a suitable set of moments
of the one-particle distribution function are derived. By investigating the
stability and asymptotic resurgent properties of this dynamical system, we
demonstrate, that its solutions exhibit a rather different behavior for large
(UV) and small (IR) effective Knudsen numbers. Close to the forward attractor
in the IR regime the constitutive relations of each moment can be written as a
multiparameter transseries. This resummation scheme allows us to extend the
definition of a transport coefficient to the non-equilibrium regime naturally.
Each transport coefficient is renormalized by the non-perturbative
contributions of the non-hydrodynamic modes. The Knudsen number dependence of
the transport coefficient is governed by the corresponding renormalization
group flow equation. An interesting feature of the Yang-Mills plasma in this
regime is that it exhibits transient non-Newtonian behavior while
hydrodynamizing. In the UV regime the solution for the moments can be written
as a power-law asymptotic series with a finite radius of convergence. We show
that radius of convergence of the UV perturbative expansion grows linearly as a
function of the shear viscosity to entropy density ratio. Finally, we compare
the universal properties in the pullback and forward attracting regions to
other kinetic models including the relaxation time approximation and the
effective kinetic Arnold-Moore-Yaffe (AMY) theory.
| [
{
"created": "Mon, 16 Nov 2020 19:23:52 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Mar 2021 20:00:34 GMT",
"version": "v2"
}
] | 2021-03-24 | [
[
"Behtash",
"A.",
""
],
[
"Kamata",
"S.",
""
],
[
"Martinez",
"M.",
""
],
[
"Schaefer",
"T.",
""
],
[
"Skokov",
"V.",
""
]
] | We investigate the non-linear transport processes and hydrodynamization of a system of gluons undergoing longitudinal boost-invariant expansion. The dynamics is described within the framework of the Boltzmann equation in the small-angle approximation. The kinetic equations for a suitable set of moments of the one-particle distribution function are derived. By investigating the stability and asymptotic resurgent properties of this dynamical system, we demonstrate, that its solutions exhibit a rather different behavior for large (UV) and small (IR) effective Knudsen numbers. Close to the forward attractor in the IR regime the constitutive relations of each moment can be written as a multiparameter transseries. This resummation scheme allows us to extend the definition of a transport coefficient to the non-equilibrium regime naturally. Each transport coefficient is renormalized by the non-perturbative contributions of the non-hydrodynamic modes. The Knudsen number dependence of the transport coefficient is governed by the corresponding renormalization group flow equation. An interesting feature of the Yang-Mills plasma in this regime is that it exhibits transient non-Newtonian behavior while hydrodynamizing. In the UV regime the solution for the moments can be written as a power-law asymptotic series with a finite radius of convergence. We show that radius of convergence of the UV perturbative expansion grows linearly as a function of the shear viscosity to entropy density ratio. Finally, we compare the universal properties in the pullback and forward attracting regions to other kinetic models including the relaxation time approximation and the effective kinetic Arnold-Moore-Yaffe (AMY) theory. |
hep-ph/9312235 | Jukka Maalampi | K. Huitu, J. Maalampi and M. Raidal | Supersymmetric Left-Right Model and its Tests in Linear Colliders | 23 pages + 11 pages of figures (available on request), HU-SEFT R
1993-16 | Nucl.Phys. B420 (1994) 449-467 | 10.1016/0550-3213(94)90073-6 | null | hep-ph | null | We investigate phenomenological implications of a supersymmetric left-right
model based on $SU(2)_L\times SU(2)_R\times U(1)_{B-L}\,$ gauge symmetry
testable in the next generation linear colliders. We concentrate in particular
on the doubly charged $SU(2)_R$ triplet higgsino $\tilde\Delta$, which we find
very suitable for experimental search. We estimate its production rate in
$e^+e^-$, $e^-e^-$, $e^-\gamma$ and $\gamma\gamma$ collisions and consider its
subsequent decays. These processes have a clear discovery signature with a very
low background from other processes.
| [
{
"created": "Tue, 7 Dec 1993 07:26:43 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Huitu",
"K.",
""
],
[
"Maalampi",
"J.",
""
],
[
"Raidal",
"M.",
""
]
] | We investigate phenomenological implications of a supersymmetric left-right model based on $SU(2)_L\times SU(2)_R\times U(1)_{B-L}\,$ gauge symmetry testable in the next generation linear colliders. We concentrate in particular on the doubly charged $SU(2)_R$ triplet higgsino $\tilde\Delta$, which we find very suitable for experimental search. We estimate its production rate in $e^+e^-$, $e^-e^-$, $e^-\gamma$ and $\gamma\gamma$ collisions and consider its subsequent decays. These processes have a clear discovery signature with a very low background from other processes. |
hep-ph/9211322 | M. Jezabek Th. T.. U. Karlsruhe | M.Jezabek and J.H.Kuehn | Light Gluinos in $Z^0$ Decays? | 4 pages,TTP92-37 | Phys.Lett. B301 (1993) 121-122 | 10.1016/0370-2693(93)90731-V | null | hep-ph | null | We point out that an apparent discrepancy between the values of
$\alpha_s(M_z)$ as determined from low versus high energy experiments can be
explained if an electrically neutral coloured fermion exists which slows down
the running of the strong coupling constant $\alpha_s$.
| [
{
"created": "Thu, 26 Nov 1992 12:45:36 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Jezabek",
"M.",
""
],
[
"Kuehn",
"J. H.",
""
]
] | We point out that an apparent discrepancy between the values of $\alpha_s(M_z)$ as determined from low versus high energy experiments can be explained if an electrically neutral coloured fermion exists which slows down the running of the strong coupling constant $\alpha_s$. |
hep-ph/9510447 | null | Giulia Ricciardi | Theoretical Review of Radiative Rare B Decays | 9 pages, latex, no figures; invited talk at European Physical Society
Conference on High Energy Physics, Brussels, July 1995; to be published in
the proceedings | null | null | DSF-T-95/39 | hep-ph | null | A status report on the theory of radiative rare $B$ decays in the standard
model is presented, with focus on inclusive decays $B \rightarrow X_{(s,d)}\,
\gamma$ and exclusive decays $B \rightarrow (K^\ast,\omega,\rho) \, \gamma$. CP
asymmetries are also briefly discussed.
| [
{
"created": "Mon, 30 Oct 1995 13:52:23 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Ricciardi",
"Giulia",
""
]
] | A status report on the theory of radiative rare $B$ decays in the standard model is presented, with focus on inclusive decays $B \rightarrow X_{(s,d)}\, \gamma$ and exclusive decays $B \rightarrow (K^\ast,\omega,\rho) \, \gamma$. CP asymmetries are also briefly discussed. |
hep-ph/0109024 | A. J. Buchmann | A. J. Buchmann (University of Tuebingen) | Relations between N and Delta electromagnetic form factors | 9 pages, 3 figures, Proceedings of the NSTAR 2000 conference, Newport
News, VA, USA, Febr. 16-19, 2000 | Excited Nucleons and Hadronic Structure, World Scientific, 2001,
eds. V. Burkert et al., pg.59 | null | null | hep-ph nucl-th | null | The inclusion of two-body exchange currents in the constituent quark model
leads to several new relations between the electromagnetic form factors of the
nucleon and Delta(1232). These are:(i) the neutron charge form factor can be
expressed as the difference between proton and Delta+ charge form factors, and
(ii) the N->Delta charge quadrupole (C2) transition form factor is connected to
the charge monopole (C0) form factor of the neutron. The latter relation is
used to estimate the charge radius of constituent quarks. Furthermore, we find
that exchange currents do not modify the SU(6) relation between the magnetic
N->Delta and the magnetic neutron form factors. Consequently, after including
exchange currents, the C2/M1 ratio in the N->Delta transition can be expressed
as a ratio of the elastic charge and magnetic form factors of the neutron.
| [
{
"created": "Tue, 4 Sep 2001 10:53:24 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Buchmann",
"A. J.",
"",
"University of Tuebingen"
]
] | The inclusion of two-body exchange currents in the constituent quark model leads to several new relations between the electromagnetic form factors of the nucleon and Delta(1232). These are:(i) the neutron charge form factor can be expressed as the difference between proton and Delta+ charge form factors, and (ii) the N->Delta charge quadrupole (C2) transition form factor is connected to the charge monopole (C0) form factor of the neutron. The latter relation is used to estimate the charge radius of constituent quarks. Furthermore, we find that exchange currents do not modify the SU(6) relation between the magnetic N->Delta and the magnetic neutron form factors. Consequently, after including exchange currents, the C2/M1 ratio in the N->Delta transition can be expressed as a ratio of the elastic charge and magnetic form factors of the neutron. |
1908.10615 | Christoph Englert | Christoph Englert, Joerg Jaeckel | Probing the Symmetric Higgs Portal with Di-Higgs Boson Production | 8 pages, 8 figures, v2: references added, version accepted for
publication in PRD | Phys. Rev. D 100, 095017 (2019) | 10.1103/PhysRevD.100.095017 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A coupling of a scalar, charged under an unbroken global U(1) symmetry, to
the Standard Model via the Higgs portal is one of the simplest gateways to a
dark sector. Yet, for masses $m_{S}\geq m_{H}/2$ there are few probes of such
an interaction. In this note we evaluate the sensitivity to the Higgs portal
coupling of di-Higgs boson production at the LHC as well as at a future high
energy hadron collider, FCC-hh, taking into account the full momentum
dependence of the process. This significantly impacts the sensitivity compared
to estimates of changes in the Higgs-coupling based on the effective potential.
We also compare our findings to precision single Higgs boson probes such as the
cross section for vector boson associated Higgs production at a future lepton
collider, e.g. FCC-ee, as well as searches for missing energy based signatures.
| [
{
"created": "Wed, 28 Aug 2019 09:52:27 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Nov 2019 14:32:25 GMT",
"version": "v2"
}
] | 2019-11-20 | [
[
"Englert",
"Christoph",
""
],
[
"Jaeckel",
"Joerg",
""
]
] | A coupling of a scalar, charged under an unbroken global U(1) symmetry, to the Standard Model via the Higgs portal is one of the simplest gateways to a dark sector. Yet, for masses $m_{S}\geq m_{H}/2$ there are few probes of such an interaction. In this note we evaluate the sensitivity to the Higgs portal coupling of di-Higgs boson production at the LHC as well as at a future high energy hadron collider, FCC-hh, taking into account the full momentum dependence of the process. This significantly impacts the sensitivity compared to estimates of changes in the Higgs-coupling based on the effective potential. We also compare our findings to precision single Higgs boson probes such as the cross section for vector boson associated Higgs production at a future lepton collider, e.g. FCC-ee, as well as searches for missing energy based signatures. |
1604.00406 | Ayres Freitas | Ayres Freitas | Numerical multi-loop integrals and applications | 60 pp., invited review for Prog.Part.Nucl.Phys., comments welcome;
v2: few minor corrections and references added, version to be published in
journal | Prog. Part. Nucl. Phys. 90, 201 (2016) | 10.1016/j.ppnp.2016.06.004 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Higher-order radiative corrections play an important role in precision
studies of the electroweak and Higgs sector, as well as for the detailed
understanding of large backgrounds to new physics searches. For corrections
beyond the one-loop level and involving many independent mass and momentum
scales, it is in general not possible to find analytic results, so that one
needs to resort to numerical methods instead. This article presents an overview
over a variety of numerical loop integration techniques, highlighting their
range of applicability, suitability for automatization, and numerical precision
and stability.
In a second part of this article, the application of numerical loop
integration methods in the area of electroweak precision tests is illustrated.
Numerical methods were essential for obtaining full two-loop predictions for
the most important precision observables within the Standard Model. The
theoretical foundations for these corrections will be described in some detail,
including aspects of the renormalization, resummation of leading loop
contributions, and the evaluation of the theory uncertainty from missing higher
orders.
| [
{
"created": "Fri, 1 Apr 2016 20:49:54 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Aug 2016 23:58:37 GMT",
"version": "v2"
}
] | 2016-08-16 | [
[
"Freitas",
"Ayres",
""
]
] | Higher-order radiative corrections play an important role in precision studies of the electroweak and Higgs sector, as well as for the detailed understanding of large backgrounds to new physics searches. For corrections beyond the one-loop level and involving many independent mass and momentum scales, it is in general not possible to find analytic results, so that one needs to resort to numerical methods instead. This article presents an overview over a variety of numerical loop integration techniques, highlighting their range of applicability, suitability for automatization, and numerical precision and stability. In a second part of this article, the application of numerical loop integration methods in the area of electroweak precision tests is illustrated. Numerical methods were essential for obtaining full two-loop predictions for the most important precision observables within the Standard Model. The theoretical foundations for these corrections will be described in some detail, including aspects of the renormalization, resummation of leading loop contributions, and the evaluation of the theory uncertainty from missing higher orders. |
hep-ph/9505219 | Frank Close | Claude Amsler and Frank Close | EVIDENCE FOR A SCALAR GLUEBALL | 10 pages. Latex. 3 figures available from authors | Phys.Lett.B353:385-390,1995 | 10.1016/0370-2693(95)00579-A | RAL-95-036 | hep-ph | null | We show that the newly discovered scalar meson $f_0(1500)$ at LEAR has
properties compatible with the lightest scalar glueball predicted by lattice
QCD and incompatible with a $\qqbar$ state. We suggest that decays of glueballs
are into pairs of glueballs (including $\eta, \eta'$ or $(\pi\pi)_S$) or by
mixing with nearby $Q\bar{Q}$ states. The partial widths of $f_0(1500)$ are in
accord with this hypothesis, tests of which include characteristic radiative
decays to $\gamma\phi,\gamma\omega, \gamma\rho$ and the prediction of a further
scalar state, $f_0'(1500 - 1800)$ which couples strongly to $K\bar{K}$,
$\eta\eta$ and $\eta\eta'$.
| [
{
"created": "Wed, 3 May 1995 14:40:00 GMT",
"version": "v1"
}
] | 2009-09-25 | [
[
"Amsler",
"Claude",
""
],
[
"Close",
"Frank",
""
]
] | We show that the newly discovered scalar meson $f_0(1500)$ at LEAR has properties compatible with the lightest scalar glueball predicted by lattice QCD and incompatible with a $\qqbar$ state. We suggest that decays of glueballs are into pairs of glueballs (including $\eta, \eta'$ or $(\pi\pi)_S$) or by mixing with nearby $Q\bar{Q}$ states. The partial widths of $f_0(1500)$ are in accord with this hypothesis, tests of which include characteristic radiative decays to $\gamma\phi,\gamma\omega, \gamma\rho$ and the prediction of a further scalar state, $f_0'(1500 - 1800)$ which couples strongly to $K\bar{K}$, $\eta\eta$ and $\eta\eta'$. |
hep-ph/0603253 | Alexander Snigirev | I.P.Lokhtin, S.V.Petrushanko, L.I.Sarycheva, A.M.Snigirev | Rapidity-dependence of jet shape broadening and quenching | 9 pages, 7 figures, 1 table, RevTex4, typos corrected, accepted for
publication in Phys. Rev. C | Phys.Rev.C73:064905,2006 | 10.1103/PhysRevC.73.064905 | null | hep-ph | null | The jet shape modification due to partonic energy loss in the dense QCD
matter is investigated by the help of the special transverse energy-energy
correlator in the vicinity of maximum energy deposition of every event. In the
accepted scenario with scattering of jet hard partons off comoving medium
constituents this correlator is independent of the pseudorapidity position of a
jet axis and becomes considerably broader (symmetrically over the
pseudorapidity and the azimuthal angle) in comparison with $pp$-collisions. At
scattering off "slow" medium constituents the broadening of correlation
functions is dependent on the pseudorapidity position of a jet axis and
increases noticeably in comparison with the previous scenario for jets with
large enough pseudorapidities. These two considered scenarios result also in
the different dependence of jet quenching on the pseudorapidity.
| [
{
"created": "Thu, 30 Mar 2006 09:42:34 GMT",
"version": "v1"
},
{
"created": "Wed, 24 May 2006 09:13:32 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Lokhtin",
"I. P.",
""
],
[
"Petrushanko",
"S. V.",
""
],
[
"Sarycheva",
"L. I.",
""
],
[
"Snigirev",
"A. M.",
""
]
] | The jet shape modification due to partonic energy loss in the dense QCD matter is investigated by the help of the special transverse energy-energy correlator in the vicinity of maximum energy deposition of every event. In the accepted scenario with scattering of jet hard partons off comoving medium constituents this correlator is independent of the pseudorapidity position of a jet axis and becomes considerably broader (symmetrically over the pseudorapidity and the azimuthal angle) in comparison with $pp$-collisions. At scattering off "slow" medium constituents the broadening of correlation functions is dependent on the pseudorapidity position of a jet axis and increases noticeably in comparison with the previous scenario for jets with large enough pseudorapidities. These two considered scenarios result also in the different dependence of jet quenching on the pseudorapidity. |
1503.01590 | G.R. Boroun | G.R. Boroun | Geometrical scaling behavior of the top structure functions ratio at the
LHeC | 6 pages, 1 table, 5 figures | Physics Letters B744(2015)142 | 10.1016/j.physletb.2015.03.051 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the ratio of the top structure functions $R^{t}(\tau_{t})$ in top
pair production as a probe of the top content of the proton at the LHeC
project. We study the top structure functions with the geometrical scaling of
gluon distribution at small $x$ and show that top reduced cross section
exhibits geometrical scaling in a large range of photon vitualities. This
analysis shows that top longitudinal structure function has sizeable impact on
the top reduced cross section at $Q^{2}{\approx}~ 4m_{t}^{2}$.
| [
{
"created": "Thu, 5 Mar 2015 09:54:35 GMT",
"version": "v1"
}
] | 2015-04-07 | [
[
"Boroun",
"G. R.",
""
]
] | We consider the ratio of the top structure functions $R^{t}(\tau_{t})$ in top pair production as a probe of the top content of the proton at the LHeC project. We study the top structure functions with the geometrical scaling of gluon distribution at small $x$ and show that top reduced cross section exhibits geometrical scaling in a large range of photon vitualities. This analysis shows that top longitudinal structure function has sizeable impact on the top reduced cross section at $Q^{2}{\approx}~ 4m_{t}^{2}$. |
1608.06815 | Alexandra Gurinovich | V.G. Baryshevsky | Depolarization of high-energy neutral particles in crystals and the
possibility to measure anomalous magnetic moments of short-lived hyperons | 10 pages | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The degree of depolarization of neutral particles in crystals can reach tens
of percents over the crystal length of several centimeters, which can be the
basis for possible experimental application of the depolarization effect for
measuring anomalous magnetic moments of short-lived neutral hyperons.
| [
{
"created": "Wed, 24 Aug 2016 13:57:53 GMT",
"version": "v1"
}
] | 2016-08-25 | [
[
"Baryshevsky",
"V. G.",
""
]
] | The degree of depolarization of neutral particles in crystals can reach tens of percents over the crystal length of several centimeters, which can be the basis for possible experimental application of the depolarization effect for measuring anomalous magnetic moments of short-lived neutral hyperons. |
0810.1647 | Sergey Mikhailov | S. V. Mikhailov, A. A. Vladimirov | ERBL and DGLAP kernels for transversity distributions. Two-loop
calculations in covariant gauge | 12 pages, 1 figure and 2 tables | Phys.Lett.B671:111-118,2009 | 10.1016/j.physletb.2008.11.051 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The results of a two-loop calculation in the Feynman gauge of both the DGLAP
and the ERBL evolution kernels for transversely polarized distributions are
presented. The structure of these evolution kernels is discussed in detail. In
addition, the effect of the two-loop evolution on the distribution amplitude of
a twist-2 transversely polarized meson is explored.
| [
{
"created": "Thu, 9 Oct 2008 12:51:59 GMT",
"version": "v1"
}
] | 2009-01-16 | [
[
"Mikhailov",
"S. V.",
""
],
[
"Vladimirov",
"A. A.",
""
]
] | The results of a two-loop calculation in the Feynman gauge of both the DGLAP and the ERBL evolution kernels for transversely polarized distributions are presented. The structure of these evolution kernels is discussed in detail. In addition, the effect of the two-loop evolution on the distribution amplitude of a twist-2 transversely polarized meson is explored. |
hep-ph/9512215 | Xing Zhi-Zhong | Zhi-zhong Xing | Possible Effects of $D^0-\bar{D}^0$ Mixing in Weak $B$ Decays | Postscript 10 pages | Phys.Lett. B371 (1996) 310-316 | 10.1016/0370-2693(96)00018-4 | LMU-17/95 | hep-ph | null | $D^0-\bar{D}^0$ mixing at a detectable level requires the presence of new
physics and may lead to some observable effects in weak decays of $B$ mesons.
We show that $CP$ violation induced by $D^0-\bar{D}^0$ mixing can manifest
itself in the decay-rate asymmetry of $B^+_u\rightarrow D_{L(H)}l^+\nu^{~}_l$
vs $B^-_u\rightarrow D_{L(H)}l^-\bar{\nu}^{~}_l$. A rephasing-invariant
generalization of the Gronau-Wyler approach is made to determine the weak phase
shift in $B^{\pm}_u\rightarrow D_{L(H)}K^{\pm}$, which is only sensitive to the
underlying new physics in $D^0-\bar{D}^0$ mixing. We also demonstrate the
possible effect of $D^0-\bar{D}^0$ mixing on $CP$ violation in decay modes of
the type $B_d\rightarrow D_{L(H)}+(\pi^0, \rho^0, {\rm etc})$. Finally the
model of four quark families is taken as an example to illustrate how the new
physics affects $D^0-\bar{D}^0$ mixing, $B^0_d-\bar{B}^0_d$ mixing and $CP$
asymmetries in the relevant $B$ decays.
| [
{
"created": "Sun, 3 Dec 1995 10:39:58 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Xing",
"Zhi-zhong",
""
]
] | $D^0-\bar{D}^0$ mixing at a detectable level requires the presence of new physics and may lead to some observable effects in weak decays of $B$ mesons. We show that $CP$ violation induced by $D^0-\bar{D}^0$ mixing can manifest itself in the decay-rate asymmetry of $B^+_u\rightarrow D_{L(H)}l^+\nu^{~}_l$ vs $B^-_u\rightarrow D_{L(H)}l^-\bar{\nu}^{~}_l$. A rephasing-invariant generalization of the Gronau-Wyler approach is made to determine the weak phase shift in $B^{\pm}_u\rightarrow D_{L(H)}K^{\pm}$, which is only sensitive to the underlying new physics in $D^0-\bar{D}^0$ mixing. We also demonstrate the possible effect of $D^0-\bar{D}^0$ mixing on $CP$ violation in decay modes of the type $B_d\rightarrow D_{L(H)}+(\pi^0, \rho^0, {\rm etc})$. Finally the model of four quark families is taken as an example to illustrate how the new physics affects $D^0-\bar{D}^0$ mixing, $B^0_d-\bar{B}^0_d$ mixing and $CP$ asymmetries in the relevant $B$ decays. |
0905.4314 | Kentarou Mawatari | Kaoru Hagiwara, Qiang Li, Kentarou Mawatari | Jet angular correlation in vector-boson fusion processes at hadron
colliders | 47 pages, 7 figures, 10 tables; references added, version to appear
in JHEP | null | 10.1088/1126-6708/2009/07/101 | KEK-TH-1219, KA-TP-08-03, SFB/CPP-08-03, HD-THEP-09-6, KIAS-P08016 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Higgs boson and massive-graviton productions in association with two jets via
vector-boson fusion (VBF) processes and their decays into a vector-boson pair
at hadron colliders are studied. They include scalar and tensor boson
production processes via weak-boson fusion in quark-quark collisions, gluon
fusion in quark-quark, quark-gluon and gluon-gluon collisions, as well as their
decays into a pair of weak bosons or virtual gluons which subsequently decay
into $\ell\bar\ell$, $q\bar q$ or $gg$. We give the helicity amplitudes
explicitly for all the VBF subprocesses, and show that the VBF amplitudes
dominate the exact matrix elements not only for the weak-boson fusion processes
but also for all the gluon fusion processes when appropriate selection cuts are
applied, such as a large rapidity separation between two jets and a slicing cut
for the transverse momenta of the jets. We also show that our off-shell
vector-boson current amplitudes reduce to the standard quark and gluon
splitting amplitudes with appropriate gluon-polarization phases in the
collinear limit. Nontrivial azimuthal angle correlations of the jets in the
production and in the decay of massive spin-0 and -2 bosons are manifestly
expressed as the quantum interference among different helicity states of the
intermediate vector-bosons. Those correlations reflect the spin and the CP
nature of the Higgs bosons and the massive gravitons.
| [
{
"created": "Wed, 27 May 2009 01:59:23 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Jul 2009 13:11:58 GMT",
"version": "v2"
}
] | 2015-05-13 | [
[
"Hagiwara",
"Kaoru",
""
],
[
"Li",
"Qiang",
""
],
[
"Mawatari",
"Kentarou",
""
]
] | Higgs boson and massive-graviton productions in association with two jets via vector-boson fusion (VBF) processes and their decays into a vector-boson pair at hadron colliders are studied. They include scalar and tensor boson production processes via weak-boson fusion in quark-quark collisions, gluon fusion in quark-quark, quark-gluon and gluon-gluon collisions, as well as their decays into a pair of weak bosons or virtual gluons which subsequently decay into $\ell\bar\ell$, $q\bar q$ or $gg$. We give the helicity amplitudes explicitly for all the VBF subprocesses, and show that the VBF amplitudes dominate the exact matrix elements not only for the weak-boson fusion processes but also for all the gluon fusion processes when appropriate selection cuts are applied, such as a large rapidity separation between two jets and a slicing cut for the transverse momenta of the jets. We also show that our off-shell vector-boson current amplitudes reduce to the standard quark and gluon splitting amplitudes with appropriate gluon-polarization phases in the collinear limit. Nontrivial azimuthal angle correlations of the jets in the production and in the decay of massive spin-0 and -2 bosons are manifestly expressed as the quantum interference among different helicity states of the intermediate vector-bosons. Those correlations reflect the spin and the CP nature of the Higgs bosons and the massive gravitons. |
0810.0511 | Roman Nevzorov | S. Hesselbach, D. J. Miller, G. Moortgat-Pick, R. Nevzorov, M. Trusov | Lightest Neutralino Mass in the MNSSM | Poster presented at ICHEP08, Philadelphia, USA, July 2008. 3 pages,
LaTeX, 2 eps figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We argue that the allowed range of the mass of the lightest neutralino in the
MNSSM is limited. We establish the theoretical upper bound on the lightest
neutralino mass and obtain an approximate solution for this mass.
| [
{
"created": "Thu, 2 Oct 2008 18:49:12 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Oct 2008 22:02:01 GMT",
"version": "v2"
}
] | 2008-10-17 | [
[
"Hesselbach",
"S.",
""
],
[
"Miller",
"D. J.",
""
],
[
"Moortgat-Pick",
"G.",
""
],
[
"Nevzorov",
"R.",
""
],
[
"Trusov",
"M.",
""
]
] | We argue that the allowed range of the mass of the lightest neutralino in the MNSSM is limited. We establish the theoretical upper bound on the lightest neutralino mass and obtain an approximate solution for this mass. |
2310.16023 | Vineet Agotiya | Siddhartha Solanki, Manohar Lal, Rishabh Sharma and Vineet Kumar
Agotiya | Study of Quarkonium properties using SUSYQM method with baryonic
chemical potential | 20 pages, 9 figures | International Journal of Modern Physics A, Vol. 37, No. 31n32,
2250196 (2022) | 10.1142/S0217751X22501962 | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | In this article, we employed the Quasi-particle debye mass at finite baryonic
chemical potential which can be used in the medium modified heavy quark
potential to solve the N-dimensional Schroedinger equation. The bound state
solution of the Schroedinger equation using Cornell potential is obtained by
Super-Symmetry Quantum Mechanics (SUSYQM) method. The thermodynamical
properties of quark matter is calculated by using baryonic chemical potential
(mu). We found that the binding energy of quarkonia dissociates more with
quasi-particle debye mass in comparison to non-perturbative and leading order
debye mass. The medium modified form of potential (real part) has been used to
study the thermodynamical properties of quark matter with different equation of
states (EoS) (i.e., pressure, energy density and speed of sound) with {mu}. The
mass spectra of quarkonia has been also calculated in the N-dimensional space,
and compared with the experimental data at N=3. We have also calculated the
dissociation temperature (T_D) for the ground states of quarkonium using the
dissociation criteria of thermal width.
| [
{
"created": "Tue, 24 Oct 2023 17:32:32 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Oct 2023 17:30:24 GMT",
"version": "v2"
}
] | 2023-10-31 | [
[
"Solanki",
"Siddhartha",
""
],
[
"Lal",
"Manohar",
""
],
[
"Sharma",
"Rishabh",
""
],
[
"Agotiya",
"Vineet Kumar",
""
]
] | In this article, we employed the Quasi-particle debye mass at finite baryonic chemical potential which can be used in the medium modified heavy quark potential to solve the N-dimensional Schroedinger equation. The bound state solution of the Schroedinger equation using Cornell potential is obtained by Super-Symmetry Quantum Mechanics (SUSYQM) method. The thermodynamical properties of quark matter is calculated by using baryonic chemical potential (mu). We found that the binding energy of quarkonia dissociates more with quasi-particle debye mass in comparison to non-perturbative and leading order debye mass. The medium modified form of potential (real part) has been used to study the thermodynamical properties of quark matter with different equation of states (EoS) (i.e., pressure, energy density and speed of sound) with {mu}. The mass spectra of quarkonia has been also calculated in the N-dimensional space, and compared with the experimental data at N=3. We have also calculated the dissociation temperature (T_D) for the ground states of quarkonium using the dissociation criteria of thermal width. |
0712.2039 | Graham D. Kribs | Graham D. Kribs, Erich Poppitz, Neal Weiner | Flavor in Supersymmetry with an Extended R-symmetry | 15 pages, REVTEX4, 9 figure files, typos fixed, refs added, published
version | Phys.Rev.D78:055010,2008 | 10.1103/PhysRevD.78.055010 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a new solution to the supersymmetric flavor problem without
flavor-blind mediation. Our proposal is to enforce a continuous or a suitably
large discrete R-symmetry on weak scale supersymmetry, so that Majorana gaugino
masses, trilinear A-terms, and the mu-term are forbidden. We find that
replacing the MSSM with an R-symmetric supersymmetric model allows order one
flavor-violating soft masses, even for squarks of order a few hundred GeV. The
minimal R-symmetric supersymmetric model contains Dirac gaugino masses and
R-symmetric Higgsino masses with no left-right mixing in the squark or slepton
sector. Dirac gaugino masses of order a few TeV with vanishing A-terms solve
most flavor problems, while the R-symmetric Higgs sector becomes important at
large tan(beta). epsilon_K can be accommodated if CP is preserved in the SUSY
breaking sector, or if there is a moderate flavor degeneracy, which can arise
naturally. epsilon'/epsilon, as well as neutron and electron EDMs are easily
within experimental bounds. The most striking phenomenological distinction of
this model is the order one flavor violation in the squark and slepton sector,
while the Dirac gaugino masses tend to be significantly heavier than the
corresponding squark and slepton masses.
| [
{
"created": "Wed, 12 Dec 2007 21:00:16 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Oct 2008 18:11:38 GMT",
"version": "v2"
}
] | 2009-01-09 | [
[
"Kribs",
"Graham D.",
""
],
[
"Poppitz",
"Erich",
""
],
[
"Weiner",
"Neal",
""
]
] | We propose a new solution to the supersymmetric flavor problem without flavor-blind mediation. Our proposal is to enforce a continuous or a suitably large discrete R-symmetry on weak scale supersymmetry, so that Majorana gaugino masses, trilinear A-terms, and the mu-term are forbidden. We find that replacing the MSSM with an R-symmetric supersymmetric model allows order one flavor-violating soft masses, even for squarks of order a few hundred GeV. The minimal R-symmetric supersymmetric model contains Dirac gaugino masses and R-symmetric Higgsino masses with no left-right mixing in the squark or slepton sector. Dirac gaugino masses of order a few TeV with vanishing A-terms solve most flavor problems, while the R-symmetric Higgs sector becomes important at large tan(beta). epsilon_K can be accommodated if CP is preserved in the SUSY breaking sector, or if there is a moderate flavor degeneracy, which can arise naturally. epsilon'/epsilon, as well as neutron and electron EDMs are easily within experimental bounds. The most striking phenomenological distinction of this model is the order one flavor violation in the squark and slepton sector, while the Dirac gaugino masses tend to be significantly heavier than the corresponding squark and slepton masses. |
1604.04486 | Tigran Kalaydzhyan | Tigran Kalaydzhyan | Comment on "Testing Planck-Scale Gravity with Accelerators" | 1 page, 1 figure. Accepted for publication in Phys. Rev. Lett | Phys. Rev. Lett. 116, 209001 (2016) | 10.1103/PhysRevLett.116.209001 | null | hep-ph gr-qc hep-ex hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We challenge the analysis and conclusions of the paper Phys. Rev. Lett. 109,
141103 (2012) by V. Gharibyan on the tests of Planck-scale gravity with
accelerators. The main objective of the Comment is the observation that the
explored domain of "quantum gravity" parameters is already ruled out
experimentally from, e.g., absence of the vacuum Cherenkov radiation.
| [
{
"created": "Fri, 15 Apr 2016 13:13:15 GMT",
"version": "v1"
}
] | 2016-05-24 | [
[
"Kalaydzhyan",
"Tigran",
""
]
] | We challenge the analysis and conclusions of the paper Phys. Rev. Lett. 109, 141103 (2012) by V. Gharibyan on the tests of Planck-scale gravity with accelerators. The main objective of the Comment is the observation that the explored domain of "quantum gravity" parameters is already ruled out experimentally from, e.g., absence of the vacuum Cherenkov radiation. |
1109.5545 | Yu. A. Simonov | Yu. A. Simonov (ITEP, Moscow) | Theory of hadron decay into baryon-antibaryon final state | 24 pages,2 figures,new results added | Phys. Rev. D 85, 105025 (2012) | 10.1103/PhysRevD.85.105025 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The nonperturbative mechanism of baryon-antibaryon production due to double
quark pair $(q\bar q)$($q\bar q)$ generation inside a hadron is considered and
the amplitude is calculated as matrix element of the vertex operator between
initial and final hadron wave functions. The vertex operator is expressed
solely in terms of first principle input: current quark masses, string tension
$\sigma$ and $\alpha_s$. In contrast to meson-meson production via single pair
generation, in baryon case a new entity appears in the vertex: the vacuum
correlation length $\lambda $, which was computed before through string tension
$\sigma$. As an application electroproduction of $\Lambda_c \bar\Lambda_c$ was
calculated and an enhancement near 4.61 GeV was found in agreement with recent
experimental data.
| [
{
"created": "Mon, 26 Sep 2011 12:47:39 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Jan 2012 11:55:29 GMT",
"version": "v2"
}
] | 2014-01-29 | [
[
"Simonov",
"Yu. A.",
"",
"ITEP, Moscow"
]
] | The nonperturbative mechanism of baryon-antibaryon production due to double quark pair $(q\bar q)$($q\bar q)$ generation inside a hadron is considered and the amplitude is calculated as matrix element of the vertex operator between initial and final hadron wave functions. The vertex operator is expressed solely in terms of first principle input: current quark masses, string tension $\sigma$ and $\alpha_s$. In contrast to meson-meson production via single pair generation, in baryon case a new entity appears in the vertex: the vacuum correlation length $\lambda $, which was computed before through string tension $\sigma$. As an application electroproduction of $\Lambda_c \bar\Lambda_c$ was calculated and an enhancement near 4.61 GeV was found in agreement with recent experimental data. |
hep-ph/9301230 | Kurt Langfeld | K.Langfeld, H.Reinhardt | Instanton Condensation in Field Strength Formulated QCD | 38 Latex pages 5 figures not included (available on request),
UNITUE-THEP-18/1992 | null | null | null | hep-ph | null | Field strength formulated Yang-Mills theory is confronted with the
traditional formulation in terms of gauge fields. It is shown that both
formulations yield the same semiclassics, in particular the same instanton
physics. However, at the tree level the field strength approach is superior
because it already includes a good deal of of quantum fluctuations of the
standard formulation. These quantum fluctuations break the scale invariance of
classical QCD and give rise to an instanton interaction and this causes the
instantons to condense and form a homogeneous instanton solid. Such the
instanton solids show up in the field strength approach as homogeneous
(constant up to gauge transformations) vacuum solutions. A new class of SU(N)
instantons is presented which are not embeddings of SU(N-1) instantons but have
non-trivial SU(N) color structure and carry winding number $n=N(N^{2}-1)/6$.
These instantons generate (after condensation) the lowest action solutions of
the field strength approach. The statistical weight (entropy) of different
homogeneous solutions for SU(3) is numerically estimated by Parisi's stochastic
quantization method. Finally, we compare instanton induced quark condensation
with the condensation of quarks in the homogeneous field strength solutions.
Our investigations show that the homogeneous vacuum of the field strength
approach simulates in an efficient way a condensate of instantons.
| [
{
"created": "Tue, 12 Jan 1993 07:18:46 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Langfeld",
"K.",
""
],
[
"Reinhardt",
"H.",
""
]
] | Field strength formulated Yang-Mills theory is confronted with the traditional formulation in terms of gauge fields. It is shown that both formulations yield the same semiclassics, in particular the same instanton physics. However, at the tree level the field strength approach is superior because it already includes a good deal of of quantum fluctuations of the standard formulation. These quantum fluctuations break the scale invariance of classical QCD and give rise to an instanton interaction and this causes the instantons to condense and form a homogeneous instanton solid. Such the instanton solids show up in the field strength approach as homogeneous (constant up to gauge transformations) vacuum solutions. A new class of SU(N) instantons is presented which are not embeddings of SU(N-1) instantons but have non-trivial SU(N) color structure and carry winding number $n=N(N^{2}-1)/6$. These instantons generate (after condensation) the lowest action solutions of the field strength approach. The statistical weight (entropy) of different homogeneous solutions for SU(3) is numerically estimated by Parisi's stochastic quantization method. Finally, we compare instanton induced quark condensation with the condensation of quarks in the homogeneous field strength solutions. Our investigations show that the homogeneous vacuum of the field strength approach simulates in an efficient way a condensate of instantons. |
hep-ph/0210364 | Miguel Angel Sanchis | M.A. Sanchis-Lozano | Searching for a light Higgs in $\Upsilon$ leptonic decays | LaTeX, 4 pages, 1 EPS figure. Talk given at 5th International
Conference on Hyperons, Charm and Beauty Hadrons, Vancouver, Canada, June
25-29, 2002 | Nucl.Phys.Proc.Suppl. 115 (2003) 374-377 | 10.1016/S0920-5632(02)02022-4 | null | hep-ph | null | Leptonic decays of vector-states of bottomonium are analized searching for a
light pseudoscalar Higgs-like neutral boson manifesting via an apparent
breaking of lepton universality.
| [
{
"created": "Sat, 26 Oct 2002 17:59:40 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Sanchis-Lozano",
"M. A.",
""
]
] | Leptonic decays of vector-states of bottomonium are analized searching for a light pseudoscalar Higgs-like neutral boson manifesting via an apparent breaking of lepton universality. |
hep-ph/0411205 | Salah Hamieh | S. Hamieh, and C. Bertulani | $g_{s}$-factor quenching with quantum statistics | 3 pages | null | null | null | hep-ph nucl-th | null | We discuss the effect of quantum statistics on the $g_{s}$-factor quenching
in nuclear medium. We have found that the two nucleon correlation function can
be described by a Gaussian with correlation length $\sigma\sim1.2$ fm. An
estimate of the M1 quenching strength is given. The effect of quantum
statistics on the retardation of the paramagnetic susceptibility is also
discussed.
| [
{
"created": "Tue, 16 Nov 2004 08:35:05 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Hamieh",
"S.",
""
],
[
"Bertulani",
"C.",
""
]
] | We discuss the effect of quantum statistics on the $g_{s}$-factor quenching in nuclear medium. We have found that the two nucleon correlation function can be described by a Gaussian with correlation length $\sigma\sim1.2$ fm. An estimate of the M1 quenching strength is given. The effect of quantum statistics on the retardation of the paramagnetic susceptibility is also discussed. |
1111.4931 | Frans Klinkhamer | F. R. Klinkhamer | Spontaneously broken Lorentz invariance from the dynamics of a heavy
sterile neutrino | 4 pages, v7: published version | JETP Lett. 95, 497 (2012) | 10.1134/S0021364012100062 | KA-TP-36-2011 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A relativistic theory for neutrino superluminality is presented (in
principle, the same mechanism applies also to other fermions). The theory
involves the standard-model particles and one additional heavy sterile neutrino
with an energy-scale close to or above the electroweak one, all particles
propagating in the usual 3+1 spacetime dimensions. Lorentz violation results
from spontaneous symmetry breaking in the sterile-neutrino sector. The theory
tries, as far as possible, to be consistent with the existing experimental data
from neutrino physics and to keep the number of assumptions minimal. There are
clear experimental predictions which can be tested.
| [
{
"created": "Mon, 21 Nov 2011 17:01:29 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Nov 2011 18:55:11 GMT",
"version": "v2"
},
{
"created": "Mon, 5 Dec 2011 19:56:43 GMT",
"version": "v3"
},
{
"created": "Thu, 22 Dec 2011 19:52:39 GMT",
"version": "v4"
},
{
"cr... | 2017-08-23 | [
[
"Klinkhamer",
"F. R.",
""
]
] | A relativistic theory for neutrino superluminality is presented (in principle, the same mechanism applies also to other fermions). The theory involves the standard-model particles and one additional heavy sterile neutrino with an energy-scale close to or above the electroweak one, all particles propagating in the usual 3+1 spacetime dimensions. Lorentz violation results from spontaneous symmetry breaking in the sterile-neutrino sector. The theory tries, as far as possible, to be consistent with the existing experimental data from neutrino physics and to keep the number of assumptions minimal. There are clear experimental predictions which can be tested. |
1808.03612 | Nan Li | Yu-Chen Ding, Nan Li, Chun-Cheng Wei, Yue-Liang Wu and Yu-Feng Zhou | Prospects of detecting dark matter through cosmic-ray antihelium with
the antiproton constraints | 25 pages, 9 figures, 3 tables. Version to appear in JCAP | null | 10.1088/1475-7516/2019/06/004 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Cosmic-ray (CR) antihelium is an important observable for dark matter (DM)
indirect searches due to extremely low secondary backgrounds towards low
energies. In a given DM model, the predicted CR antihelium flux is expected to
be strongly correlated with that of CR antiprotons. In this work, we use the
AMS-02 $\bar p/p$ data to constrain the DM annihilation cross section, and the
ALICE data on the $^3\overline{\text{He}}$ and $\overline{\text{T}}$
productions to determine the parameters in the coalescence model for
anti-nucleus formation. The hadronic cross sections are estimated using
Monte-Carlo event generators including $\texttt{EPOS-LHC}$ and
$\texttt{DPMJET}$. Based on these constraints, we make predictions for the
maximal antihelium flux for typical DM annihilation final states, and perform a
detailed analysis on the uncertainties due to the DM density profiles and CR
propagation models. We find that the results are highly insensitive to both of
them, but still significantly depends on the hadronization models in event
generators. The prospects of detecting antihelium for the AMS-02 experiment is
discussed. We show that with very optimistic assumptions, CR
$^3\overline{\text{He}}$ is within the reach of the AMS-02 experiment. The
$^3\overline{\text{He}}$ events which can be detected by AMS-02 are likely to
have kinetic energy $T \gtrsim 30$~GeV, which is consistent with the
preliminary AMS-02 search results. The events which can be observed by AMS-02
are likely to arise dominantly from secondary backgrounds rather than DM
interactions.
| [
{
"created": "Fri, 10 Aug 2018 16:34:13 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Mar 2019 10:44:52 GMT",
"version": "v2"
},
{
"created": "Mon, 27 May 2019 12:08:13 GMT",
"version": "v3"
}
] | 2019-06-12 | [
[
"Ding",
"Yu-Chen",
""
],
[
"Li",
"Nan",
""
],
[
"Wei",
"Chun-Cheng",
""
],
[
"Wu",
"Yue-Liang",
""
],
[
"Zhou",
"Yu-Feng",
""
]
] | Cosmic-ray (CR) antihelium is an important observable for dark matter (DM) indirect searches due to extremely low secondary backgrounds towards low energies. In a given DM model, the predicted CR antihelium flux is expected to be strongly correlated with that of CR antiprotons. In this work, we use the AMS-02 $\bar p/p$ data to constrain the DM annihilation cross section, and the ALICE data on the $^3\overline{\text{He}}$ and $\overline{\text{T}}$ productions to determine the parameters in the coalescence model for anti-nucleus formation. The hadronic cross sections are estimated using Monte-Carlo event generators including $\texttt{EPOS-LHC}$ and $\texttt{DPMJET}$. Based on these constraints, we make predictions for the maximal antihelium flux for typical DM annihilation final states, and perform a detailed analysis on the uncertainties due to the DM density profiles and CR propagation models. We find that the results are highly insensitive to both of them, but still significantly depends on the hadronization models in event generators. The prospects of detecting antihelium for the AMS-02 experiment is discussed. We show that with very optimistic assumptions, CR $^3\overline{\text{He}}$ is within the reach of the AMS-02 experiment. The $^3\overline{\text{He}}$ events which can be detected by AMS-02 are likely to have kinetic energy $T \gtrsim 30$~GeV, which is consistent with the preliminary AMS-02 search results. The events which can be observed by AMS-02 are likely to arise dominantly from secondary backgrounds rather than DM interactions. |
2012.07408 | Siavash Neshatpour | S. Neshatpour, T. Hurth, F. Mahmoudi | Searching for New Physics with $B^{0} \to K^{*0} \mu^+ \mu^-$ | Based on talks given at FPCP2020 and ICHEP2020, 6 pages, 2 figures | null | null | CERN-TH-2020-210 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | One of the main indications for New Physics in rare $B$-decays is deduced
from the tension between experimental and Standard Model predictions of the
angular analysis of the $B^0 \to K^{*0} \mu^+\mu^-$ decay. There are however
possible non-local hadronic effects which in principle can also explain these
tensions. In this work, we consider a statistical approach for differentiating
the source of the tension in $B^0 \to K^{*0} \mu^+\mu^-$ observables and we
also investigate the prospects of such a comparison with future data from the
LHCb experiment.
| [
{
"created": "Mon, 14 Dec 2020 10:53:33 GMT",
"version": "v1"
}
] | 2020-12-24 | [
[
"Neshatpour",
"S.",
""
],
[
"Hurth",
"T.",
""
],
[
"Mahmoudi",
"F.",
""
]
] | One of the main indications for New Physics in rare $B$-decays is deduced from the tension between experimental and Standard Model predictions of the angular analysis of the $B^0 \to K^{*0} \mu^+\mu^-$ decay. There are however possible non-local hadronic effects which in principle can also explain these tensions. In this work, we consider a statistical approach for differentiating the source of the tension in $B^0 \to K^{*0} \mu^+\mu^-$ observables and we also investigate the prospects of such a comparison with future data from the LHCb experiment. |
1505.06335 | David Fogaca | S. M. Sanches Jr., D. A. Foga\c{c}a, F. S. Navarra and H. Marrochio | Cavitation in a quark gluon plasma with finite chemical potential and
several transport coefficients | null | Phys. Rev. C 92, 025204 (2015) | 10.1103/PhysRevC.92.025204 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the effects of a finite chemical potential on the occurrence of
cavitation in a quark gluon plasma (QGP). We solve the evolution equations of
second order viscous relativistic hydrodynamics using three different equations
of state. The first one was derived in lattice QCD and represents QGP at zero
chemical potential. It was previously used in the study of cavitation. The
second equation of state also comes from lattice QCD and is a recent
parametrization of the QGP at finite chemical potential. The third one is
similar to the MIT equation of state with chemical potential and includes
nonperturbative effects through the gluon condensates. We conclude that at
finite chemical potential cavitation in the QGP occurs earlier than at zero
chemical potential. We also consider transport coefficients from a holographic
model of a non-conformal QGP at zero chemical potential. In this case
cavitation does not occur.
| [
{
"created": "Sat, 23 May 2015 14:08:22 GMT",
"version": "v1"
},
{
"created": "Thu, 28 May 2015 16:54:22 GMT",
"version": "v2"
},
{
"created": "Fri, 14 Aug 2015 15:15:57 GMT",
"version": "v3"
}
] | 2015-08-17 | [
[
"Sanches",
"S. M.",
"Jr."
],
[
"Fogaça",
"D. A.",
""
],
[
"Navarra",
"F. S.",
""
],
[
"Marrochio",
"H.",
""
]
] | We study the effects of a finite chemical potential on the occurrence of cavitation in a quark gluon plasma (QGP). We solve the evolution equations of second order viscous relativistic hydrodynamics using three different equations of state. The first one was derived in lattice QCD and represents QGP at zero chemical potential. It was previously used in the study of cavitation. The second equation of state also comes from lattice QCD and is a recent parametrization of the QGP at finite chemical potential. The third one is similar to the MIT equation of state with chemical potential and includes nonperturbative effects through the gluon condensates. We conclude that at finite chemical potential cavitation in the QGP occurs earlier than at zero chemical potential. We also consider transport coefficients from a holographic model of a non-conformal QGP at zero chemical potential. In this case cavitation does not occur. |
hep-ph/0406171 | Bo-Qiang Ma | Zhun Lu, Bo-Qiang Ma | Sivers function in light-cone quark model and azimuthal spin asymmetries
in pion electroproduction | 17 LaTex pages, 2 figures. Final version for journal publication | Nucl.Phys. A741 (2004) 200-214 | 10.1016/j.nuclphysa.2004.06.006 | null | hep-ph hep-ex | null | We perform a calculation of Sivers function in a light-cone SU(6)
quark-diquark model with both scalar diquark and vector diquark spectators. We
derive the transverse momentum dependent light-cone wave function of the proton
by taking into account the Melosh-Wigner rotation. By adopting one-gluon
exchange, we obtain a non-vanishing Sivers function of $down$ quark from
interference of proton spin amplitudes. We analyze the $\frac{|P_{h\perp}|}{M}$
weighted Sivers asymmetries in $\pi^+$, $\pi^-$ and $\pi^0$ electroproduction
off transverse polarized proton target, averaged and not averaged by the
kinematics of HERMES experiment.
| [
{
"created": "Tue, 15 Jun 2004 23:08:02 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Lu",
"Zhun",
""
],
[
"Ma",
"Bo-Qiang",
""
]
] | We perform a calculation of Sivers function in a light-cone SU(6) quark-diquark model with both scalar diquark and vector diquark spectators. We derive the transverse momentum dependent light-cone wave function of the proton by taking into account the Melosh-Wigner rotation. By adopting one-gluon exchange, we obtain a non-vanishing Sivers function of $down$ quark from interference of proton spin amplitudes. We analyze the $\frac{|P_{h\perp}|}{M}$ weighted Sivers asymmetries in $\pi^+$, $\pi^-$ and $\pi^0$ electroproduction off transverse polarized proton target, averaged and not averaged by the kinematics of HERMES experiment. |
hep-ph/9906356 | Michal Czakon | M. Czakon, M. Zralek (Univ. Silesia, Katowice), J. Gluza (DESY
Zeuthen, Univ. Silesia) | Left-right symmetry and heavy particle quantum effects | 23 pages, 3 figures | Nucl.Phys.B573:57-74,2000 | 10.1016/S0550-3213(99)00717-8 | null | hep-ph | null | We have renormalized a classical left-right model with a bidoublet, and left
and right triplets in the Higgs sector. We focus on oblique corrections and
show the interplay between the top quark, heavy neutrinos and Higgses
contribution to the muon $\Delta r$ parameter. In the SM, custodial symmetry
prevents large oblique corrections to appear. Although in LR models there is no
such symmetry to make vanish the quadratically diverging terms, we have shown,
that heavy Higgses contributions to $\Delta r$ are under control. Also the top
contribution to $\Delta r$, quite different from that in the SM, is discussed.
However, heavy neutrinos seem to give the most important contributions. From
oblique corrections, they can be as large as the SM top one. Moreover, vertex
and box diagrams give additional non-decoupling effects and only concrete
numerical estimates are able to answer whether the model is still
self-consistent.
| [
{
"created": "Mon, 14 Jun 1999 11:32:50 GMT",
"version": "v1"
}
] | 2011-01-13 | [
[
"Czakon",
"M.",
"",
"Univ. Silesia, Katowice"
],
[
"Zralek",
"M.",
"",
"Univ. Silesia, Katowice"
],
[
"Gluza",
"J.",
"",
"DESY\n Zeuthen, Univ. Silesia"
]
] | We have renormalized a classical left-right model with a bidoublet, and left and right triplets in the Higgs sector. We focus on oblique corrections and show the interplay between the top quark, heavy neutrinos and Higgses contribution to the muon $\Delta r$ parameter. In the SM, custodial symmetry prevents large oblique corrections to appear. Although in LR models there is no such symmetry to make vanish the quadratically diverging terms, we have shown, that heavy Higgses contributions to $\Delta r$ are under control. Also the top contribution to $\Delta r$, quite different from that in the SM, is discussed. However, heavy neutrinos seem to give the most important contributions. From oblique corrections, they can be as large as the SM top one. Moreover, vertex and box diagrams give additional non-decoupling effects and only concrete numerical estimates are able to answer whether the model is still self-consistent. |
1210.1855 | Tuhin Roy | Stephen D. Ellis, Tuhin S. Roy, and Jakub Scholtz | Jets and Photons | updated references | null | 10.1103/PhysRevLett.110.122003 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This Letter applies the concept of `jets', as constructed from calorimeter
cell four-vectors, to jets composed (primarily) of photons (or leptons). Thus
jets become a superset of both traditional objects such as QCD-jets, photons,
and electrons, and more unconventional objects such as photon-jets and
electron-jets, defined as collinear photons and electrons, respectively. Since
standard objects such as single photons become a subset of jets in this
approach, standard jet substructure techniques are incorporated into the photon
finder toolbox. We demonstrate that, for a single photon identification
efficiency of 80% or above, the use of jet substructure techniques reduces the
number of QCD-jets faking photons by factors of 2.5 to 4. Depending on the
topology of the photon-jets, the substructure variables reduce the number of
photon-jets faking single photons by factors of 10 to 10^3 at a single photon
identification efficiency of 80%.
| [
{
"created": "Fri, 5 Oct 2012 20:02:33 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Oct 2012 17:15:25 GMT",
"version": "v2"
}
] | 2013-03-27 | [
[
"Ellis",
"Stephen D.",
""
],
[
"Roy",
"Tuhin S.",
""
],
[
"Scholtz",
"Jakub",
""
]
] | This Letter applies the concept of `jets', as constructed from calorimeter cell four-vectors, to jets composed (primarily) of photons (or leptons). Thus jets become a superset of both traditional objects such as QCD-jets, photons, and electrons, and more unconventional objects such as photon-jets and electron-jets, defined as collinear photons and electrons, respectively. Since standard objects such as single photons become a subset of jets in this approach, standard jet substructure techniques are incorporated into the photon finder toolbox. We demonstrate that, for a single photon identification efficiency of 80% or above, the use of jet substructure techniques reduces the number of QCD-jets faking photons by factors of 2.5 to 4. Depending on the topology of the photon-jets, the substructure variables reduce the number of photon-jets faking single photons by factors of 10 to 10^3 at a single photon identification efficiency of 80%. |
hep-ph/0407316 | Jure Zupan | Michael Gronau | CP violation in B meson decays | Talk presented at the Sixth International Conference on Hyperons,
Charm and Beauty Hadrons, IIT, Chicago, June 27--July 3 2004 | Nucl.Phys.Proc.Suppl.142:263-270,2005 | 10.1016/j.nuclphysbps.2005.01.047 | null | hep-ph | null | Recent CP asymmetry measurements in tree-dominated processes, $B^0\to
\pi^+\pi^-, \rho^+\rho^-, \rho^{\pm}\pi^{\mp}, B^+\to DK^+$, and in
penguin-dominated decays, $B \to \pi^0 K_S, \eta' K_S, \phi K_S$, are
interpreted in the framework of the Kobayashi-Maskawa (KM) mechanism of CP
violation. The KM phase emerges as the dominant source of CP violation in
tree-dominated decays, which are beginning to constrain the unitarity triangle
beyond other constraints. Improving precision of CP asymmetry measurements in
penguin-dominated decays may indicate the need for new physics.
| [
{
"created": "Wed, 28 Jul 2004 08:46:58 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Gronau",
"Michael",
""
]
] | Recent CP asymmetry measurements in tree-dominated processes, $B^0\to \pi^+\pi^-, \rho^+\rho^-, \rho^{\pm}\pi^{\mp}, B^+\to DK^+$, and in penguin-dominated decays, $B \to \pi^0 K_S, \eta' K_S, \phi K_S$, are interpreted in the framework of the Kobayashi-Maskawa (KM) mechanism of CP violation. The KM phase emerges as the dominant source of CP violation in tree-dominated decays, which are beginning to constrain the unitarity triangle beyond other constraints. Improving precision of CP asymmetry measurements in penguin-dominated decays may indicate the need for new physics. |
hep-ph/9209298 | Andrew Jaffe | Andrew H. Jaffe, Ed Fenimore, Michael S. Turner | Limits on Neutrino Radiative Decay from Sn1987a | 5 Pages, 2 Figures (avalable on request). LaTeX, WorldSci.sty | null | null | null | hep-ph astro-ph | null | We calculate limits on the properties of neutrinos using data from gamma-ray
detectors on the Pioneer Venus Orbiter and Solar Max Mission satellites. A
massive neutrino decaying in flight from the supernova would produce gamma rays
detectable by these instruments. The lack of such a signal allows us to
constrain the mass, radiative lifetime, and branching ratio to photons of a
massive neutrino species produced in the supernova. Presented at Beyond The
Standard Model III, June, 1992.
| [
{
"created": "Wed, 30 Sep 1992 19:39:20 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Jaffe",
"Andrew H.",
""
],
[
"Fenimore",
"Ed",
""
],
[
"Turner",
"Michael S.",
""
]
] | We calculate limits on the properties of neutrinos using data from gamma-ray detectors on the Pioneer Venus Orbiter and Solar Max Mission satellites. A massive neutrino decaying in flight from the supernova would produce gamma rays detectable by these instruments. The lack of such a signal allows us to constrain the mass, radiative lifetime, and branching ratio to photons of a massive neutrino species produced in the supernova. Presented at Beyond The Standard Model III, June, 1992. |
hep-ph/9310357 | Vladimir Braun | V.M Braun | Deep Inelastic Scattering Beyond Perturbation Theory | Talk given at the Leipzig workshop on High Energy Physics,
Kyffhaeuser, September 20-24,1993, LATEX, 12 pages, 3 figures included as
uu-encoded file, MPI-Ph/93-78 | null | null | null | hep-ph | null | I discuss possibilities to observe the instanton-induced contributions to
deep inelastic scattering which correspond to nonperturbative exponential
corrections to the coefficient functions in front of parton distributions of
the leading twist.
| [
{
"created": "Wed, 27 Oct 1993 11:25:33 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Braun",
"V. M",
""
]
] | I discuss possibilities to observe the instanton-induced contributions to deep inelastic scattering which correspond to nonperturbative exponential corrections to the coefficient functions in front of parton distributions of the leading twist. |
hep-ph/9908401 | Stephen Wong | S.M.H. Wong | Color Screening Effects on Hadronization in Relativistic Heavy Ion
Collisions | 8 embedded EPS figures, revtex style, 13 pages, Phys. Rev. C insisted
on title change | Phys.Rev. C61 (2000) 064903 | 10.1103/PhysRevC.61.064903 | NUC-MINN-99/11-T | hep-ph nucl-th | null | The effects of color screening on the hadronization of a parton plasma into a
hadron gas are examined at the energies of the relativistic heavy ion collider.
It is found to have the tendency to prevent hadronization and therefore
delaying the conversion of the partons into a hadron gas. Because of the
continual expansion, the resulting hadron gas number densities are lower when
screening is included. This should reduce the hadronic noise to genuine signals
of the quark-gluon plasma. In this sense, color screening is favorable and
should be included in numerical models. In any case, we advocate that numerical
models should allow the confining forces and color screening to act on each
other so as to undergo the phase transition in a natural way. Hadronization is
also shown to seriously disrupt parton equilibration and is yet another reason
why full parton chemical equilibration should not be expected.
| [
{
"created": "Wed, 18 Aug 1999 16:30:23 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Mar 2000 01:10:02 GMT",
"version": "v2"
},
{
"created": "Tue, 16 May 2000 16:19:36 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Wong",
"S. M. H.",
""
]
] | The effects of color screening on the hadronization of a parton plasma into a hadron gas are examined at the energies of the relativistic heavy ion collider. It is found to have the tendency to prevent hadronization and therefore delaying the conversion of the partons into a hadron gas. Because of the continual expansion, the resulting hadron gas number densities are lower when screening is included. This should reduce the hadronic noise to genuine signals of the quark-gluon plasma. In this sense, color screening is favorable and should be included in numerical models. In any case, we advocate that numerical models should allow the confining forces and color screening to act on each other so as to undergo the phase transition in a natural way. Hadronization is also shown to seriously disrupt parton equilibration and is yet another reason why full parton chemical equilibration should not be expected. |
hep-ph/9902309 | J. Gunion | C.-H. Chen, M. Drees and J.F. Gunion | Addendum/Erratum for `Searching for Invisible and Almost Invisible
Particles at $\bf e^+e^-$ Colliders' [hep-ph/9512230] and `A Non-Standard
String/SUSY Scenario and its Phenomenological Implications' [hep-ph/9607421] | 4 pages, 1 figure, latex. In this slight revision of the addendum, we
further refine our discussion of small but possibly observable chargino path
lengths | null | null | UCD-99-2 | hep-ph | null | We correct our treatment of decays of the lightest chargino to final states
containing the lightest neutralino in the case where the chargino and
neutralino masses differ by less than 1 GeV. A brief summary of the
phenomenological implications is given.
| [
{
"created": "Wed, 10 Feb 1999 23:16:04 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Feb 1999 02:52:26 GMT",
"version": "v2"
},
{
"created": "Sat, 27 Feb 1999 01:24:06 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Chen",
"C. -H.",
""
],
[
"Drees",
"M.",
""
],
[
"Gunion",
"J. F.",
""
]
] | We correct our treatment of decays of the lightest chargino to final states containing the lightest neutralino in the case where the chargino and neutralino masses differ by less than 1 GeV. A brief summary of the phenomenological implications is given. |
1008.2765 | Ilia Gogoladze | Ilia Gogoladze, Rizwan Khalid, Shabbar Raza, Qaisar Shafi | t-b-tau Yukawa unification for mu < 0 with a sub-TeV sparticle spectrum | 10 pages, 7 figures, 1 table, v3: Journal Version | null | 10.1007/JHEP12(2010)055 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show compatibility with all known experimental constraints of t-b-tau
Yukawa coupling unification in supersymmetric SU(4)_c x SU(2)_L x SU(2)_R which
has non-universal gaugino masses and the MSSM parameter mu < 0. In particular,
the relic neutralino abundance satisfies the WMAP bounds and Delta (g-2)_mu is
in good agreement with the observations. We identify benchmark points for the
sparticle spectra which can be tested at the LHC, including those associated
with gluino and stau coannihilation channels, mixed bino-Higgsino state and the
A-funnel region. We also briefly discuss prospects for testing Yukawa
unification with the ongoing and planned direct detection experiments.
| [
{
"created": "Mon, 16 Aug 2010 20:12:09 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Aug 2010 18:46:05 GMT",
"version": "v2"
},
{
"created": "Wed, 19 Jan 2011 22:49:37 GMT",
"version": "v3"
}
] | 2015-05-19 | [
[
"Gogoladze",
"Ilia",
""
],
[
"Khalid",
"Rizwan",
""
],
[
"Raza",
"Shabbar",
""
],
[
"Shafi",
"Qaisar",
""
]
] | We show compatibility with all known experimental constraints of t-b-tau Yukawa coupling unification in supersymmetric SU(4)_c x SU(2)_L x SU(2)_R which has non-universal gaugino masses and the MSSM parameter mu < 0. In particular, the relic neutralino abundance satisfies the WMAP bounds and Delta (g-2)_mu is in good agreement with the observations. We identify benchmark points for the sparticle spectra which can be tested at the LHC, including those associated with gluino and stau coannihilation channels, mixed bino-Higgsino state and the A-funnel region. We also briefly discuss prospects for testing Yukawa unification with the ongoing and planned direct detection experiments. |
1809.11021 | Keith R. Dienes | David Curtin, Keith R. Dienes, Brooks Thomas | Dynamical Dark Matter, MATHUSLA, and the Lifetime Frontier | 11 pages, LaTeX, 2 figures. A preliminary version of some of the
results of this paper has been included within the official MATHUSLA white
paper arXiv:1806.07396, which summarizes the physics case for the MATHUSLA
detector | Phys. Rev. D 98, 115005 (2018) | 10.1103/PhysRevD.98.115005 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | MATHUSLA is a proposed surface detector at CERN that would be able to observe
the decays of non-hadronic electrically neutral long-lived particles (LLPs)
with almost no background or trigger limitations. This would allow MATHUSLA to
probe sub-GeV to TeV masses and lifetimes up to $c\tau \sim 10^7~{\rm m}$.
MATHUSLA can play an important role in probing dark-matter scenarios involving
extended hidden sectors, where additional dark states often manifest as LLPs. A
prime example of such a scenario is furnished by the Dynamical Dark Matter
(DDM) framework, which intrinsically gives rise to large ensembles of dark
states exhibiting a broad range of masses and lifetimes. In this paper, we
examine the extent to which MATHUSLA can probe the DDM parameter space, and we
demonstrate that MATHUSLA may be capable of providing direct confirmation of
certain unique aspects of the DDM framework which might be difficult to probe
in other ways.
| [
{
"created": "Fri, 28 Sep 2018 19:13:57 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Jan 2019 23:16:35 GMT",
"version": "v2"
}
] | 2019-01-03 | [
[
"Curtin",
"David",
""
],
[
"Dienes",
"Keith R.",
""
],
[
"Thomas",
"Brooks",
""
]
] | MATHUSLA is a proposed surface detector at CERN that would be able to observe the decays of non-hadronic electrically neutral long-lived particles (LLPs) with almost no background or trigger limitations. This would allow MATHUSLA to probe sub-GeV to TeV masses and lifetimes up to $c\tau \sim 10^7~{\rm m}$. MATHUSLA can play an important role in probing dark-matter scenarios involving extended hidden sectors, where additional dark states often manifest as LLPs. A prime example of such a scenario is furnished by the Dynamical Dark Matter (DDM) framework, which intrinsically gives rise to large ensembles of dark states exhibiting a broad range of masses and lifetimes. In this paper, we examine the extent to which MATHUSLA can probe the DDM parameter space, and we demonstrate that MATHUSLA may be capable of providing direct confirmation of certain unique aspects of the DDM framework which might be difficult to probe in other ways. |
1208.4858 | Daniel Duffty | Daniel Duffty, Zack Sullivan | Model independent reach for W-prime bosons at the LHC | 9 pages, 10 figures, RevTex format | null | 10.1103/PhysRevD.86.075018 | IIT-CAPP-12-07 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The semileptonic decay of single-top-quark production provides a strong probe
for W-prime bosons at the CERN Large Hadron Collider. We propose an explicit
search strategy for pp -> W-prime -> tb -> l nu b j for use at 7 TeV and 8 TeV
collider energies, and integrated luminosities ranging from 5 to 20 fb^-1.
Based on detector-simulated results, we predict that a lower bound can be
placed on the mass of right-handed W-prime_R with standard model-like couplings
of m_{W-prime_R} > 1800 GeV at sqrt{S}=7 TeV with 5 fb^-1, and of m_{W-prime_R}
> 2000 GeV at 8 TeV with 20 fb^-1. For left-handed W-prime_L bosons we find a
lower bound of 1750-1800 GeV at 7 TeV and 5 fb^-1 depending on the sign of the
interference with standard model single-top-quark production. We present
effective coupling g^prime dependent limits for accessible masses, and stress
the importance of these limits for comparison with theoretical models.
| [
{
"created": "Thu, 23 Aug 2012 20:41:10 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Sep 2012 18:26:30 GMT",
"version": "v2"
}
] | 2015-06-11 | [
[
"Duffty",
"Daniel",
""
],
[
"Sullivan",
"Zack",
""
]
] | The semileptonic decay of single-top-quark production provides a strong probe for W-prime bosons at the CERN Large Hadron Collider. We propose an explicit search strategy for pp -> W-prime -> tb -> l nu b j for use at 7 TeV and 8 TeV collider energies, and integrated luminosities ranging from 5 to 20 fb^-1. Based on detector-simulated results, we predict that a lower bound can be placed on the mass of right-handed W-prime_R with standard model-like couplings of m_{W-prime_R} > 1800 GeV at sqrt{S}=7 TeV with 5 fb^-1, and of m_{W-prime_R} > 2000 GeV at 8 TeV with 20 fb^-1. For left-handed W-prime_L bosons we find a lower bound of 1750-1800 GeV at 7 TeV and 5 fb^-1 depending on the sign of the interference with standard model single-top-quark production. We present effective coupling g^prime dependent limits for accessible masses, and stress the importance of these limits for comparison with theoretical models. |
hep-ph/9409222 | Matthias Jamin | Matthias Jamin | QCD corrections to inclusive $\Delta S=1,2$ transitions | 3 pages, Invited talk presented at ``QCD'94'', Montpellier, France,
July 7 - 13, 1994, hep-ph/yymmnnn | Nucl.Phys.Proc.Suppl. 39BC (1995) 260-262 | 10.1016/0920-5632(95)00082-K | null | hep-ph | null | The talk summarises a calculation of the two-point functions for $\Delta S=1$
current-current and QCD-penguin operators, as well as for the $\Delta S=2$
operator, at the next-to-leading order. The size of the gluonic corrections to
current-current operators is large, providing a qualitative understanding of
the observed enhancement in $\Delta I=1/2$ transitions. In the $\Delta S=2$
sector the QCD corrections are quite moderate ($\approx -20\%$). This work has
been done in collaboration with Antonio Pich.
| [
{
"created": "Mon, 5 Sep 1994 10:34:12 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Jamin",
"Matthias",
""
]
] | The talk summarises a calculation of the two-point functions for $\Delta S=1$ current-current and QCD-penguin operators, as well as for the $\Delta S=2$ operator, at the next-to-leading order. The size of the gluonic corrections to current-current operators is large, providing a qualitative understanding of the observed enhancement in $\Delta I=1/2$ transitions. In the $\Delta S=2$ sector the QCD corrections are quite moderate ($\approx -20\%$). This work has been done in collaboration with Antonio Pich. |
1308.6799 | Matthew Dolan | O. Buchmueller, Matthew J. Dolan, Christopher McCabe | Beyond Effective Field Theory for Dark Matter Searches at the LHC | 23 pages, 7 figures | null | 10.1007/JHEP01(2014)025 | IPPP/13/63; DCPT/13/128 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the validity of effective field theory (EFT) interpretations of
monojet searches for dark matter at the LHC for vector and axial-vector
interactions. We show that the EFT approach is valid when the mediator has mass
m_med greater than 2.5 TeV. We find that the current limits on the contact
interaction scale Lambda in the EFT apply to theories that are perturbative for
dark matter mass m_DM < 800 GeV. However, for all values of m_DM in these
theories, the mediator width is larger than the mass, so that a particle-like
interpretation of the mediator is doubtful. Furthermore, consistency with the
thermal relic density occurs only for 170 <m_DM < 520 GeV. For lighter mediator
masses, the EFT limit either under-estimates the true limit (because the
process is resonantly enhanced) or over-estimates it (because the missing
energy distribution is too soft). We give some `rules of thumb' that can be
used to estimate the limit on Lambda (to an accuracy of about 50%) for any dark
matter and mediator masses from knowledge of the EFT limit. We also compare the
relative sensitivities of monojet and dark matter direct detection searches
finding that both dominate in different regions of the m_DM-m_med plane.
Comparing only the EFT limit with direct searches is misleading and can lead to
incorrect conclusions about the relative sensitivity of the two search
approaches.
| [
{
"created": "Fri, 30 Aug 2013 17:07:52 GMT",
"version": "v1"
}
] | 2015-06-17 | [
[
"Buchmueller",
"O.",
""
],
[
"Dolan",
"Matthew J.",
""
],
[
"McCabe",
"Christopher",
""
]
] | We study the validity of effective field theory (EFT) interpretations of monojet searches for dark matter at the LHC for vector and axial-vector interactions. We show that the EFT approach is valid when the mediator has mass m_med greater than 2.5 TeV. We find that the current limits on the contact interaction scale Lambda in the EFT apply to theories that are perturbative for dark matter mass m_DM < 800 GeV. However, for all values of m_DM in these theories, the mediator width is larger than the mass, so that a particle-like interpretation of the mediator is doubtful. Furthermore, consistency with the thermal relic density occurs only for 170 <m_DM < 520 GeV. For lighter mediator masses, the EFT limit either under-estimates the true limit (because the process is resonantly enhanced) or over-estimates it (because the missing energy distribution is too soft). We give some `rules of thumb' that can be used to estimate the limit on Lambda (to an accuracy of about 50%) for any dark matter and mediator masses from knowledge of the EFT limit. We also compare the relative sensitivities of monojet and dark matter direct detection searches finding that both dominate in different regions of the m_DM-m_med plane. Comparing only the EFT limit with direct searches is misleading and can lead to incorrect conclusions about the relative sensitivity of the two search approaches. |
2010.12437 | Elena Santopinto | Roelof Bijker, Hugo Garc\'ia-Tecocoatzi, Alessandro Giachino, Emmanuel
Ortiz-Pacheco, Elena Santopinto | Masses and decay widths of $\Xi_{c/b}$ and $\Xi^\prime_{c/b}$ baryons | references added | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article, we present a complete classification of the negative parity
$\Xi'_{c/b}$ and $\Xi_{c/b}$ $P$-wave states: 7 belonging to the $SU(3)$ flavor
sextet and 7 to the flavor anti-triplet, the calculation of the $\Xi'_{c/b}$
and $\Xi_{c/b}$ strong partial decay widths into $^2\Sigma_c \bar{K}$,
$^2\Xi_c^{'} \pi$, $^2\Sigma_c \bar{K}$, $^4\Xi_c^{'} \pi$, $\Lambda_c^{'}
\bar{K}$, $\Xi_c^{} \pi$ and $\Xi_c^{} \eta$ channels both within the
Elementary Emission Model (EEM) and the $^3P_0$ model, and the calculation of
the electromagnetic decay widths for $\Xi'_{c/b}$ and $\Xi_{c/b}$ radiative
decays. By means of the equal-spacing mass rule and by the analysis of the
strong partial decay widths, we suggest possible assignments for the new LHCb
$\Xi_{c}(2923)$, $\Xi_{c}(2939)$, and $\Xi_{c}(2965)$ states, as well as for
the $\Xi_{c}$'s previously reported by Belle and BaBar. Our results can be
tested by future experiments, at LHCb and Belle, disentangling the remaining
missing piece of information, {\it i.e.} the quantum numbers. Finally, a
comparison is made between a three-quark and a quark-diquark description of
$\Xi_c$ states. Very recently the LHCb collaboration reported the observation
of two new $\Xi_b$ states, namely $\Xi_b(6327)^{0}$ and $\Xi_b(6333)$, in
$\Lambda_b^0 K^{-} \pi^{+}$ channel with a statistical significance larger than
nine standard deviations. The experimental masses and widths of these two
states are consistent with our mass and width predictions for the doublet of
D-wave excitations of the $\Xi_b$ system with
$J^{P}_{\Xi_b(6327)^{0}}=\frac{3}{2}^{+}$ and
$J^{P}_{\Xi_b(6333)^{0}}=\frac{5}{2}^{+}$.
| [
{
"created": "Fri, 23 Oct 2020 14:30:50 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Dec 2020 16:35:51 GMT",
"version": "v2"
},
{
"created": "Mon, 25 Oct 2021 15:42:32 GMT",
"version": "v3"
}
] | 2021-10-26 | [
[
"Bijker",
"Roelof",
""
],
[
"García-Tecocoatzi",
"Hugo",
""
],
[
"Giachino",
"Alessandro",
""
],
[
"Ortiz-Pacheco",
"Emmanuel",
""
],
[
"Santopinto",
"Elena",
""
]
] | In this article, we present a complete classification of the negative parity $\Xi'_{c/b}$ and $\Xi_{c/b}$ $P$-wave states: 7 belonging to the $SU(3)$ flavor sextet and 7 to the flavor anti-triplet, the calculation of the $\Xi'_{c/b}$ and $\Xi_{c/b}$ strong partial decay widths into $^2\Sigma_c \bar{K}$, $^2\Xi_c^{'} \pi$, $^2\Sigma_c \bar{K}$, $^4\Xi_c^{'} \pi$, $\Lambda_c^{'} \bar{K}$, $\Xi_c^{} \pi$ and $\Xi_c^{} \eta$ channels both within the Elementary Emission Model (EEM) and the $^3P_0$ model, and the calculation of the electromagnetic decay widths for $\Xi'_{c/b}$ and $\Xi_{c/b}$ radiative decays. By means of the equal-spacing mass rule and by the analysis of the strong partial decay widths, we suggest possible assignments for the new LHCb $\Xi_{c}(2923)$, $\Xi_{c}(2939)$, and $\Xi_{c}(2965)$ states, as well as for the $\Xi_{c}$'s previously reported by Belle and BaBar. Our results can be tested by future experiments, at LHCb and Belle, disentangling the remaining missing piece of information, {\it i.e.} the quantum numbers. Finally, a comparison is made between a three-quark and a quark-diquark description of $\Xi_c$ states. Very recently the LHCb collaboration reported the observation of two new $\Xi_b$ states, namely $\Xi_b(6327)^{0}$ and $\Xi_b(6333)$, in $\Lambda_b^0 K^{-} \pi^{+}$ channel with a statistical significance larger than nine standard deviations. The experimental masses and widths of these two states are consistent with our mass and width predictions for the doublet of D-wave excitations of the $\Xi_b$ system with $J^{P}_{\Xi_b(6327)^{0}}=\frac{3}{2}^{+}$ and $J^{P}_{\Xi_b(6333)^{0}}=\frac{5}{2}^{+}$. |
0803.1422 | Celso C. Nishi | C. C. Nishi and M. M. Guzzo | Flavor mixing in a Lee-type model | v2: 25pp in preprint form, typos corrected and references added, one
paragraph around Eq.(90) added in conclusions | Phys.Rev.D78:033008,2008 | 10.1103/PhysRevD.78.033008 | null | hep-ph hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An exactly solvable Quantum Field Theory (QFT) model of Lee-type is
constructed to study how neutrino flavor eigenstates are created through
interactions and how the localization properties of neutrinos follows from the
parent particle that decays. The two-particle states formed by the neutrino and
the accompanying charged lepton can be calculated exactly as well as their
creation probabilities. We can show that the coherent creation of neutrino
flavor eigenstates follows from the common negligible contribution of neutrino
masses to their creation probabilities. On the other hand, it is shown that it
is not possible to associate a well defined "flavor" to mixed states of charged
leptons.
| [
{
"created": "Mon, 10 Mar 2008 14:27:04 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Aug 2008 20:21:19 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Nishi",
"C. C.",
""
],
[
"Guzzo",
"M. M.",
""
]
] | An exactly solvable Quantum Field Theory (QFT) model of Lee-type is constructed to study how neutrino flavor eigenstates are created through interactions and how the localization properties of neutrinos follows from the parent particle that decays. The two-particle states formed by the neutrino and the accompanying charged lepton can be calculated exactly as well as their creation probabilities. We can show that the coherent creation of neutrino flavor eigenstates follows from the common negligible contribution of neutrino masses to their creation probabilities. On the other hand, it is shown that it is not possible to associate a well defined "flavor" to mixed states of charged leptons. |
hep-ph/9604318 | Robert Perry | Robert J. Perry | A Constituent Picture of Hadrons from Light-Front QCD | 10 pages, Contribution to the proceedings of Hadron Structure 96,
Slovakia, Feb., 1996 | null | null | null | hep-ph nucl-th | null | It may be possible to derive a constituent approximation for bound states in
QCD using hamiltonian light-front field theory. Cutoffs that violate explicit
gauge invariance and Lorentz covariance must be employed. A similarity
renormalization group and coupling coherence are used to compute the effective
hamiltonian as an expansion in powers of the canonical QCD running coupling
constant. At second order the QCD hamiltonian contains a confining interaction,
which is being studied using bound state perturbation theory. Explicit
constituent masses appear because of symmetry violations, and confinement also
produces mass gaps, leading to the possibility of an accurate non-perturbative
constituent approximation emerging in light-front QCD.
| [
{
"created": "Fri, 12 Apr 1996 21:00:18 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Perry",
"Robert J.",
""
]
] | It may be possible to derive a constituent approximation for bound states in QCD using hamiltonian light-front field theory. Cutoffs that violate explicit gauge invariance and Lorentz covariance must be employed. A similarity renormalization group and coupling coherence are used to compute the effective hamiltonian as an expansion in powers of the canonical QCD running coupling constant. At second order the QCD hamiltonian contains a confining interaction, which is being studied using bound state perturbation theory. Explicit constituent masses appear because of symmetry violations, and confinement also produces mass gaps, leading to the possibility of an accurate non-perturbative constituent approximation emerging in light-front QCD. |
1901.02010 | Miguel Escudero | Miguel Escudero, Dan Hooper, Gordan Krnjaic and Mathias Pierre | Cosmology With a Very Light $L_\mu - L_\tau$ Gauge Boson | 13 pages + 5 appendices, 10 figures. v2: Added comment to reflect
that $\Delta N_{eff}$ is only modified for $m_{Z'} > {\rm eV}$ and cropped
Fig. 2 accordingly. Added comment on possible cosmological energy injection
bounds. Main conclusions unchanged. Added references. v3: Matches the
published version, typos fixed, references added | JHEP 1903 (2019) 071 | 10.1007/JHEP03(2019)071 | FERMILAB-PUB-19-001-A, LPT-Orsay-18-15, IFIC-19-02, KCL-19-01,
IFT-UAM/CSIC-19-7 | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we explore in detail the cosmological implications of an
abelian $L_\mu-L_\tau$ gauge extension of the Standard Model featuring a light
and weakly coupled $Z'$. Such a scenario is motivated by the longstanding $\sim
\, 4 \sigma$ discrepancy between the measured and predicted values of the
muon's anomalous magnetic moment, $(g-2)_\mu$, as well as the tension between
late and early time determinations of the Hubble constant. If sufficiently
light, the $Z'$ population will decay to neutrinos, increasing the overall
energy density of radiation and altering the expansion history of the early
universe. We identify two distinct regions of parameter space in this model in
which the Hubble tension can be significantly relaxed. The first of these is
the previously identified region in which a $\sim \, 10-20$ MeV $Z'$ reaches
equilibrium in the early universe and then decays, heating the neutrino
population and delaying the process of neutrino decoupling. For a coupling of
$g_{\mu-\tau} \simeq (3-8) \times 10^{-4}$, such a particle can also explain
the observed $(g-2)_{\mu}$ anomaly. In the second region, the $Z'$ is very
light ($m_{Z'} \sim 1\,\text{eV}$ to $\text{MeV}$) and very weakly coupled
($g_{\mu-\tau} \sim 10^{-13}$ to $10^{-9}$). In this case, the $Z'$ population
is produced through freeze-in, and decays to neutrinos after neutrino
decoupling. Across large regions of parameter space, we predict a contribution
to the energy density of radiation that can appreciably relax the reported
Hubble tension, $\Delta N_{\rm eff} \simeq 0.2$.
| [
{
"created": "Mon, 7 Jan 2019 19:00:00 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Jan 2019 18:58:44 GMT",
"version": "v2"
},
{
"created": "Thu, 14 Mar 2019 10:43:58 GMT",
"version": "v3"
}
] | 2019-03-15 | [
[
"Escudero",
"Miguel",
""
],
[
"Hooper",
"Dan",
""
],
[
"Krnjaic",
"Gordan",
""
],
[
"Pierre",
"Mathias",
""
]
] | In this paper, we explore in detail the cosmological implications of an abelian $L_\mu-L_\tau$ gauge extension of the Standard Model featuring a light and weakly coupled $Z'$. Such a scenario is motivated by the longstanding $\sim \, 4 \sigma$ discrepancy between the measured and predicted values of the muon's anomalous magnetic moment, $(g-2)_\mu$, as well as the tension between late and early time determinations of the Hubble constant. If sufficiently light, the $Z'$ population will decay to neutrinos, increasing the overall energy density of radiation and altering the expansion history of the early universe. We identify two distinct regions of parameter space in this model in which the Hubble tension can be significantly relaxed. The first of these is the previously identified region in which a $\sim \, 10-20$ MeV $Z'$ reaches equilibrium in the early universe and then decays, heating the neutrino population and delaying the process of neutrino decoupling. For a coupling of $g_{\mu-\tau} \simeq (3-8) \times 10^{-4}$, such a particle can also explain the observed $(g-2)_{\mu}$ anomaly. In the second region, the $Z'$ is very light ($m_{Z'} \sim 1\,\text{eV}$ to $\text{MeV}$) and very weakly coupled ($g_{\mu-\tau} \sim 10^{-13}$ to $10^{-9}$). In this case, the $Z'$ population is produced through freeze-in, and decays to neutrinos after neutrino decoupling. Across large regions of parameter space, we predict a contribution to the energy density of radiation that can appreciably relax the reported Hubble tension, $\Delta N_{\rm eff} \simeq 0.2$. |
hep-ph/0203025 | Hannes Jung | S.P. Baranov (Moscow), H. Jung (Lund), L. Joensson (Lund), S. Padhi
(Montreal), N.P. Zotov (Moscow) | A phenomenological interpretation of open charm production at HERA in
terms of the semi-hard approach | DESY 02-017, LUNFD6/(NFFL--7209) 2002 | Eur.Phys.J.C24:425-437,2002 | 10.1007/s10052-002-0957-3 | null | hep-ph | null | In the framework of the semi-hard (k_t-factorization) approach, we analyze
the various charm production processes in the kinematic region covered by the
HERA experiments.
| [
{
"created": "Mon, 4 Mar 2002 14:49:28 GMT",
"version": "v1"
}
] | 2011-09-13 | [
[
"Baranov",
"S. P.",
"",
"Moscow"
],
[
"Jung",
"H.",
"",
"Lund"
],
[
"Joensson",
"L.",
"",
"Lund"
],
[
"Padhi",
"S.",
"",
"Montreal"
],
[
"Zotov",
"N. P.",
"",
"Moscow"
]
] | In the framework of the semi-hard (k_t-factorization) approach, we analyze the various charm production processes in the kinematic region covered by the HERA experiments. |
1411.4151 | Eef van Beveren | Eef van Beveren, Susana Coito and George Rupp | On the existence of a superlight scalar boson | Lecture prepared for 3rd International Conference on New Frontiers in
Physics, 28 July - 6 August, Kolymbari (Crete, Greece). 19 pages, figures,
plain LaTeX | Eur. Phys. J. Web Conf 95, 02007 (2015) | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this lecture we show that the study of hadronic resonances is severely
hampered by the lack of accurate data and, moreover, that for similar reason
the study of Weak substructure does not make sufficient progress. We
furthermore report on an unexplained high statistics signal that may indicate
the existence of a superlight scalar boson.
| [
{
"created": "Sat, 15 Nov 2014 14:31:12 GMT",
"version": "v1"
}
] | 2017-12-19 | [
[
"van Beveren",
"Eef",
""
],
[
"Coito",
"Susana",
""
],
[
"Rupp",
"George",
""
]
] | In this lecture we show that the study of hadronic resonances is severely hampered by the lack of accurate data and, moreover, that for similar reason the study of Weak substructure does not make sufficient progress. We furthermore report on an unexplained high statistics signal that may indicate the existence of a superlight scalar boson. |
hep-ph/0510093 | BingAn Li | Bing An Li (Univ. of Kentucky) | A possible 0^{-+} glueball candidate X(1835) | 19 pages | Phys.Rev.D74:034019,2006 | 10.1103/PhysRevD.74.034019 | null | hep-ph | null | The possibility of X(1835) as a 0^{-+} glueball is investigated.
| [
{
"created": "Fri, 7 Oct 2005 12:41:09 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Oct 2005 14:27:27 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Li",
"Bing An",
"",
"Univ. of Kentucky"
]
] | The possibility of X(1835) as a 0^{-+} glueball is investigated. |
hep-ph/9412212 | null | Pran Nath and R.Arnowitt | The Decay b-s+gamma in SUSY Extensions of the Standard Model | Based on invited talk at the ICHEP94 Conf.at Glasgow, July
94;postscript file 3pages plus one fig available on request | null | null | null | hep-ph | null | A brief review is given of the decay b-s+gamma in SUSY extensions of the
Standard Model.It is found that the recent CLEO results put strong constraints
on the parameter space of the minimal N=1 Supergravity unified theory.Dark
matter analyses are also strongly constrained for mu>0.
| [
{
"created": "Thu, 1 Dec 1994 20:33:06 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Nath",
"Pran",
""
],
[
"Arnowitt",
"R.",
""
]
] | A brief review is given of the decay b-s+gamma in SUSY extensions of the Standard Model.It is found that the recent CLEO results put strong constraints on the parameter space of the minimal N=1 Supergravity unified theory.Dark matter analyses are also strongly constrained for mu>0. |
2208.11771 | Gonzalo Sanchez Garcia | Sabya Sachi Chatterjee, St\'ephane Lavignac, O. G. Miranda, G. Sanchez
Garcia | Constraining Non-Standard Interactions with Coherent Elastic
Neutrino-Nucleus Scattering at the European Spallation Source | 25 pages, 9 figures | null | 10.1103/PhysRevD.107.055019 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The European Spallation Source (ESS), currently under construction in Sweden,
will provide an intense pulsed neutrino flux allowing for high-statistics
measurements of coherent elastic neutrino-nucleus scattering (CE{\nu}NS) with
advanced nuclear recoil detectors. In this paper, we investigate in detail the
possibility of constraining non-standard neutrino interactions (NSIs) through
such precision CE{\nu}NS measurements at the ESS, considering the different
proposed detection technologies, either alone or in combination. We first study
the sensitivity to neutral-current NSI parameters that each detector can reach
in 3 years of data taking. We then show that operating two detectors
simultaneously can significantly improve the expected sensitivity on
flavor-diagonal NSI parameters. Combining the results of two detectors turns
out to be even more useful when two NSI parameters are assumed to be
nonvanishing at a time. In this case, suitably chosen detector combinations can
reduce the degeneracies between some pairs of NSI parameters to a small region
of the parameter space.
| [
{
"created": "Wed, 24 Aug 2022 20:56:15 GMT",
"version": "v1"
},
{
"created": "Fri, 31 Mar 2023 15:07:19 GMT",
"version": "v2"
}
] | 2023-04-03 | [
[
"Chatterjee",
"Sabya Sachi",
""
],
[
"Lavignac",
"Stéphane",
""
],
[
"Miranda",
"O. G.",
""
],
[
"Garcia",
"G. Sanchez",
""
]
] | The European Spallation Source (ESS), currently under construction in Sweden, will provide an intense pulsed neutrino flux allowing for high-statistics measurements of coherent elastic neutrino-nucleus scattering (CE{\nu}NS) with advanced nuclear recoil detectors. In this paper, we investigate in detail the possibility of constraining non-standard neutrino interactions (NSIs) through such precision CE{\nu}NS measurements at the ESS, considering the different proposed detection technologies, either alone or in combination. We first study the sensitivity to neutral-current NSI parameters that each detector can reach in 3 years of data taking. We then show that operating two detectors simultaneously can significantly improve the expected sensitivity on flavor-diagonal NSI parameters. Combining the results of two detectors turns out to be even more useful when two NSI parameters are assumed to be nonvanishing at a time. In this case, suitably chosen detector combinations can reduce the degeneracies between some pairs of NSI parameters to a small region of the parameter space. |
2402.12893 | Jasmina Nasufi | Rikkert Frederix, Leif Gellersen and Jasmina Nasufi | Matrix Element Corrections in top quark decays for the ttW process | 14 pages, 5 figures | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We present a method that allows enabling Matrix Element Corrections (MECs) in
Pythia8 with MC@NLO matching, without incurring double counting. MECs are an
interesting feature that may contribute to the accuracy of theoretical
predictions, alongside matching and merging. We directly compare our method to
a specific choice of settings in Pythia8, which can remove double-counting for
MECs in certain processes. We show results by taking the ttW process as an
example. This choice allows us to study the impact of decay MECs in the 2SSl
and 3l final states. We find that jet-related observables receive these
corrections unevenly throughout the phase space. They can contribute up to $\pm
6\% in certain regions.
| [
{
"created": "Tue, 20 Feb 2024 10:37:30 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Apr 2024 09:20:31 GMT",
"version": "v2"
}
] | 2024-04-09 | [
[
"Frederix",
"Rikkert",
""
],
[
"Gellersen",
"Leif",
""
],
[
"Nasufi",
"Jasmina",
""
]
] | We present a method that allows enabling Matrix Element Corrections (MECs) in Pythia8 with MC@NLO matching, without incurring double counting. MECs are an interesting feature that may contribute to the accuracy of theoretical predictions, alongside matching and merging. We directly compare our method to a specific choice of settings in Pythia8, which can remove double-counting for MECs in certain processes. We show results by taking the ttW process as an example. This choice allows us to study the impact of decay MECs in the 2SSl and 3l final states. We find that jet-related observables receive these corrections unevenly throughout the phase space. They can contribute up to $\pm 6\% in certain regions. |
1210.4133 | Alexei Prokudin | Alexei Prokudin | QCD Evolution Workshop: Introduction | 8 pages, 3 figures; needs ws-ijmpcs.cls (supplied). Talk presented at
QCD Evolution Workshop, 14 - 17 May 2012, Thomas Jefferson National
Accelerator Facility, Newport News (VA), USA | null | 10.1142/S2010194512009038 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The introduction talk given at the beginning of QCD Evolution workshop held
in Thomas Jefferson National Accelerator Facility (Jefferson Lab) on May 14
-17, 2012.
| [
{
"created": "Mon, 15 Oct 2012 18:18:28 GMT",
"version": "v1"
}
] | 2015-06-11 | [
[
"Prokudin",
"Alexei",
""
]
] | The introduction talk given at the beginning of QCD Evolution workshop held in Thomas Jefferson National Accelerator Facility (Jefferson Lab) on May 14 -17, 2012. |
hep-ph/9908329 | Amir Fariborz | Amir H. Fariborz | Lowest-Lying Scalar Mesons and a Possible Probe of Their Quark
Substructure | Talk given at 21st Annual MRST Conference: High Energy Physics at the
Millenium, Ottawa, Ontario, Canada, 10-12 May 1999, 8 pages | null | 10.1063/1.1301287 | null | hep-ph | null | In this talk, an overview of the status of the light scalar mesons in the
context of the non linear chiral Lagrangian of references [1-3] is presented.
The evidence for the existence of a scalar nonet below 1 GeV is reviewed, and
it is shown that by introducing a scalar nonet an indirect way of probing the
quark substructure of these scalars through the scalar mixing angle can be
obtained. It is then reviewed that consistency of this non-linear chiral
Lagrangian framework with the experimental data on pi pi and pi K scattering,
as well as the decay eta' to eta pi pi, results in a range for the mixing angle
which indicates that the quark substructure of these light scalars are closer
to a four quark picture.
| [
{
"created": "Wed, 11 Aug 1999 23:28:34 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Fariborz",
"Amir H.",
""
]
] | In this talk, an overview of the status of the light scalar mesons in the context of the non linear chiral Lagrangian of references [1-3] is presented. The evidence for the existence of a scalar nonet below 1 GeV is reviewed, and it is shown that by introducing a scalar nonet an indirect way of probing the quark substructure of these scalars through the scalar mixing angle can be obtained. It is then reviewed that consistency of this non-linear chiral Lagrangian framework with the experimental data on pi pi and pi K scattering, as well as the decay eta' to eta pi pi, results in a range for the mixing angle which indicates that the quark substructure of these light scalars are closer to a four quark picture. |
1406.6787 | Matthias Steinhauser | Matthias Steinhauser | $B_s\to \mu^+\mu^-$ and $\bar{B} \to X_s \gamma$ to NNLO | 8 pages, contribution to the proceedings of Loops and Legs in Quantum
Field Theory, 27 April - 2 May 2014, Weimar, Germany | null | null | TTP14-016, SFB/CPP-14-32 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this contribution, the recent calculation of next-to-next-to-leading order
QCD and next-to-leading order electroweak corrections to the decay $B_s\to
\mu^+\mu^-$ is reviewed, and a detailed discussion of the uncertainty of the
theory prediction is provided. Furthermore, we discuss the status of the
next-to-next-to-leading order QCD corrections to $\bar{B} \to X_s \gamma$.
| [
{
"created": "Thu, 26 Jun 2014 07:07:13 GMT",
"version": "v1"
}
] | 2014-06-27 | [
[
"Steinhauser",
"Matthias",
""
]
] | In this contribution, the recent calculation of next-to-next-to-leading order QCD and next-to-leading order electroweak corrections to the decay $B_s\to \mu^+\mu^-$ is reviewed, and a detailed discussion of the uncertainty of the theory prediction is provided. Furthermore, we discuss the status of the next-to-next-to-leading order QCD corrections to $\bar{B} \to X_s \gamma$. |
1610.05682 | Gui-Jun Ding | Jun-Nan Lu, Gui-Jun Ding | Alternative Schemes of Predicting Lepton Mixing Parameters from Discrete
Flavor and CP Symmetry | 47 pages, 12 figures | Phys. Rev. D 95, 015012 (2017) | 10.1103/PhysRevD.95.015012 | USTC-ICTS-16-11 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We suggest two alternative schemes to predict lepton mixing angles as well as
$CP$ violating phases from a discrete flavor symmetry group combined with $CP$
symmetry. In the first scenario, the flavor and $CP$ symmetry is broken to the
residual groups of the structure $Z_2\times CP$ in the neutrino and charged
lepton sectors. The resulting lepton mixing matrix depends on two free
parameters $\theta_{\nu}$ and $\theta_{l}$. This type of breaking pattern is
extended to the quark sector. In the second scheme, an abelian subgroup
contained in the flavor group is preserved by the charged lepton mass matrix
and the neutrino mass matrix is invariant under a single remnant $CP$
transformation, all lepton mixing parameter are determined in terms of three
free parameters $\theta_{1, 2, 3}$. We derive the most general criterion to
determine whether two distinct residual symmetries lead to the same mixing
pattern if the redefinition of the free parameters $\theta_{\nu, l}$ and
$\theta_{1, 2, 3}$ is taken into account. We have studied the lepton mixing
patterns arising from the flavor group $S_4$ and $CP$ symmetry which are
subsequently broken to all of the possible residual symmetries discussed in
this work.
| [
{
"created": "Tue, 18 Oct 2016 15:54:17 GMT",
"version": "v1"
}
] | 2017-01-25 | [
[
"Lu",
"Jun-Nan",
""
],
[
"Ding",
"Gui-Jun",
""
]
] | We suggest two alternative schemes to predict lepton mixing angles as well as $CP$ violating phases from a discrete flavor symmetry group combined with $CP$ symmetry. In the first scenario, the flavor and $CP$ symmetry is broken to the residual groups of the structure $Z_2\times CP$ in the neutrino and charged lepton sectors. The resulting lepton mixing matrix depends on two free parameters $\theta_{\nu}$ and $\theta_{l}$. This type of breaking pattern is extended to the quark sector. In the second scheme, an abelian subgroup contained in the flavor group is preserved by the charged lepton mass matrix and the neutrino mass matrix is invariant under a single remnant $CP$ transformation, all lepton mixing parameter are determined in terms of three free parameters $\theta_{1, 2, 3}$. We derive the most general criterion to determine whether two distinct residual symmetries lead to the same mixing pattern if the redefinition of the free parameters $\theta_{\nu, l}$ and $\theta_{1, 2, 3}$ is taken into account. We have studied the lepton mixing patterns arising from the flavor group $S_4$ and $CP$ symmetry which are subsequently broken to all of the possible residual symmetries discussed in this work. |
2307.09459 | Chiara Bissolotti | Chiara Bissolotti, Radja Boughezal, Kaan Simsek | SMEFT analysis with LHeC, FCC-eh, and EIC DIS pseudodata | 6 pages, 2 figures. Presented at DIS2023: XXX International Workshop
on Deep-Inelastic Scattering and Related Subjects, Michigan State University,
USA, 27-31 March 2023 | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In this study, we examine the possibilities opened by upcoming high-energy
deep-inelastic scattering (DIS) experiments to investigate new physics within
the framework of the Standard Model Effective Field Theory (SMEFT).
Specifically, we investigate the beyond-the-Standard-Model (BSM) potential of
the Large Hadron-electron Collider (LHeC) and the Future Circular lepton-hadron
Collider (FCC-eh), and we improve previous simulations of the Electron-Ion
Collider (EIC) by incorporating $Z$-boson vertex corrections. Our fits,
performed using DIS pseudodata, reveal that the LHeC and the FCC-eh can play a
crucial role in resolving degeneracies observed in the parameter space of
Wilson coefficients in global fits using the Higgs, diboson, electroweak, and
top data. This emphasizes the significance of precision DIS measurements in
advancing our understanding of new physics.
| [
{
"created": "Tue, 18 Jul 2023 17:40:57 GMT",
"version": "v1"
}
] | 2023-07-19 | [
[
"Bissolotti",
"Chiara",
""
],
[
"Boughezal",
"Radja",
""
],
[
"Simsek",
"Kaan",
""
]
] | In this study, we examine the possibilities opened by upcoming high-energy deep-inelastic scattering (DIS) experiments to investigate new physics within the framework of the Standard Model Effective Field Theory (SMEFT). Specifically, we investigate the beyond-the-Standard-Model (BSM) potential of the Large Hadron-electron Collider (LHeC) and the Future Circular lepton-hadron Collider (FCC-eh), and we improve previous simulations of the Electron-Ion Collider (EIC) by incorporating $Z$-boson vertex corrections. Our fits, performed using DIS pseudodata, reveal that the LHeC and the FCC-eh can play a crucial role in resolving degeneracies observed in the parameter space of Wilson coefficients in global fits using the Higgs, diboson, electroweak, and top data. This emphasizes the significance of precision DIS measurements in advancing our understanding of new physics. |
1510.08514 | Masaki Yamada | Masaki Yamada | Affleck-Dine leptogenesis and its backreaction to inflaton dynamics | 6 pages, 2 figures | null | 10.1016/j.physletb.2015.12.080 | IPMU 15-0189; DESY 15-195 | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the backreaction of the Affleck-Dine leptogenesis to inflaton
dynamics in the F-term hybrid and chaotic inflation models in supergravity. We
determine the lightest neutrino mass in both models so that the predictions of
spectral index, tensor-to-scalar ratio, and baryon abundance are consistent
with observations.
| [
{
"created": "Wed, 28 Oct 2015 22:30:11 GMT",
"version": "v1"
}
] | 2016-02-17 | [
[
"Yamada",
"Masaki",
""
]
] | We investigate the backreaction of the Affleck-Dine leptogenesis to inflaton dynamics in the F-term hybrid and chaotic inflation models in supergravity. We determine the lightest neutrino mass in both models so that the predictions of spectral index, tensor-to-scalar ratio, and baryon abundance are consistent with observations. |
hep-ph/0006105 | Deog Ki Hong | Deog Ki Hong | Radiative mass in QCD at high density | 8 pages, 2 figures. One reference and a footnote added. To appear in
Phys. Rev. D. Rapid. Comm | Phys.Rev.D62:091501,2000 | 10.1103/PhysRevD.62.091501 | null | hep-ph | null | We show that radiatively generated Majorana mass for antiquarks is same as
the Cooper-pair gap. We then calculate the electromagnetic corrections to mass
of particles in the color-flavor locking phase of QCD at high density. The mass
spectrum forms multiplets under $SU(2)_V\times U(1)_V$. The charged pions and
kaons get the electromagnetic mass which is proportional to the Cooper-pair
gap.
| [
{
"created": "Sun, 11 Jun 2000 10:42:14 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Sep 2000 06:49:00 GMT",
"version": "v2"
}
] | 2009-12-30 | [
[
"Hong",
"Deog Ki",
""
]
] | We show that radiatively generated Majorana mass for antiquarks is same as the Cooper-pair gap. We then calculate the electromagnetic corrections to mass of particles in the color-flavor locking phase of QCD at high density. The mass spectrum forms multiplets under $SU(2)_V\times U(1)_V$. The charged pions and kaons get the electromagnetic mass which is proportional to the Cooper-pair gap. |
hep-ph/0302086 | Yukinari Sumino | Y. Sumino | Top quark and QCD physics at e+e- linear colliders: recent progress | 9 pages, 1 figure; Talk given at the International Linear Collider
Workshop (LCWS02), Jeju, Korea, Aug. 2002 | null | null | null | hep-ph | null | I review the studies, which were reported after the last Linear Collider
Workshop, on top quark physics and QCD physics at a future e+e- linear
collider.
| [
{
"created": "Wed, 12 Feb 2003 03:29:24 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Sumino",
"Y.",
""
]
] | I review the studies, which were reported after the last Linear Collider Workshop, on top quark physics and QCD physics at a future e+e- linear collider. |
hep-ph/0605254 | Rajiv V. Gavai | Rajiv V. Gavai and Sourendu Gupta | Lattice QCD Results on Strangeness and Quasi-Quarks in Heavy-Ion
Collisions | 9 pages, 6 Figures, Invited Talk at the International Conference on
Strangeness in Quark Matter, ``SQM2006'', UCLA, Los Angeles, USA, Mar. 26-31,
2006 | J.Phys. G32 (2006) S275-S282 | 10.1088/0954-3899/32/12/S34 | TIFR/TH/06-11 | hep-ph hep-lat nucl-th | null | Fluctuations of conserved quantities in heavy-ion collisions have been argued
to be diagnostic tools for the nature of the produced phase. These can be
related to the predictions of quark number susceptibilities (QNS) from lattice
QCD. Using the diagonal QNS, we extracted the Wroblewski parameter in a
dynamical QCD computation. Our results on the cross correlations \chi_{BQ},
\chi_{BY}, \chi_{BS} and \chi_{QY} allow us to explore the charge and baryon
number of objects that carry flavour. We present evidence that in the high
temperature phase of QCD the different flavour quantum numbers are excited in
linkages which are exactly the same as one expects from quarks.
| [
{
"created": "Wed, 24 May 2006 09:17:00 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Gavai",
"Rajiv V.",
""
],
[
"Gupta",
"Sourendu",
""
]
] | Fluctuations of conserved quantities in heavy-ion collisions have been argued to be diagnostic tools for the nature of the produced phase. These can be related to the predictions of quark number susceptibilities (QNS) from lattice QCD. Using the diagonal QNS, we extracted the Wroblewski parameter in a dynamical QCD computation. Our results on the cross correlations \chi_{BQ}, \chi_{BY}, \chi_{BS} and \chi_{QY} allow us to explore the charge and baryon number of objects that carry flavour. We present evidence that in the high temperature phase of QCD the different flavour quantum numbers are excited in linkages which are exactly the same as one expects from quarks. |
hep-ph/9810320 | null | David H Lyth | Inflation with TeV-scale gravity | 6 pages, to appear in PLB. v3 has Same conclusion stated more
precisely | Phys.Lett. B448 (1999) 191-194 | 10.1016/S0370-2693(99)00051-9 | null | hep-ph | null | Allowing for the possibility of large extra dimensions, the fundamental
Planck scale $M$ could be anywhere in the range $\TeV\lsim M\lsim \mpl$, where
$\mpl=2.4\times 10^{18}\GeV$ is the four-dimensional Planck scale. If
$M\sim\TeV$, quantum corrections would not destabilize the Higgs mass even if
there were no supersymmetry. But we point out that supersymmetry must in fact
be present, if there is an era of cosmological inflation, since during such an
era the inflaton mass satisfies $m\ll M^2/\mpl=10^{-15}(M/\TeV)$ and
supersymmetry will be needed to protect it. If the inflation hypothesis is
accepted, there is no reason to think that Nature has chosen the low value
$M\sim \TeV$, however convenient that choice might have been for the next
generation of collider experiments.
| [
{
"created": "Sun, 11 Oct 1998 13:30:43 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Oct 1998 15:11:32 GMT",
"version": "v2"
},
{
"created": "Wed, 20 Jan 1999 15:10:45 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Lyth",
"David H",
""
]
] | Allowing for the possibility of large extra dimensions, the fundamental Planck scale $M$ could be anywhere in the range $\TeV\lsim M\lsim \mpl$, where $\mpl=2.4\times 10^{18}\GeV$ is the four-dimensional Planck scale. If $M\sim\TeV$, quantum corrections would not destabilize the Higgs mass even if there were no supersymmetry. But we point out that supersymmetry must in fact be present, if there is an era of cosmological inflation, since during such an era the inflaton mass satisfies $m\ll M^2/\mpl=10^{-15}(M/\TeV)$ and supersymmetry will be needed to protect it. If the inflation hypothesis is accepted, there is no reason to think that Nature has chosen the low value $M\sim \TeV$, however convenient that choice might have been for the next generation of collider experiments. |
hep-ph/9607201 | Grossman Yuval | Yuval Grossman and Harry J. Lipkin | Flavor Oscillations from a Spatially Localized Source: A Simple General
Treatment | 20 pages, revtex, no figures | Phys.Rev. D55 (1997) 2760-2767 | 10.1103/PhysRevD.55.2760 | WIS-96/27/Jun-PH, TAUP 2346-96 | hep-ph | null | A unique description avoiding confusion is presented for all flavor
oscillation experiments in which particles of a definite flavor are emitted
from a localized source. The probability for finding a particle with the wrong
flavor must vanish at the position of the source for all times. This condition
requires flavor-time and flavor-energy factorizations which determine uniquely
the flavor mixture observed at a detector in the oscillation region; i.e. where
the overlaps between the wave packets for different mass eigenstates are almost
complete. Oscillation periods calculated for ``gedanken'' time-measurement
experiments are shown to give the correct measured oscillation wave length in
space when multiplied by the group velocity. Examples of neutrinos propagation
in a weak field and in a gravitational field are given. In these cases the
relative phase is modified differently for measurements in space and time.
Energy-momentum (frequency-wave number) and space-time descriptions are
complementary, equally valid and give the same results. The two identical phase
shifts obtained describe the same physics; adding them together to get a factor
of two is double counting.
| [
{
"created": "Mon, 1 Jul 1996 06:16:14 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Grossman",
"Yuval",
""
],
[
"Lipkin",
"Harry J.",
""
]
] | A unique description avoiding confusion is presented for all flavor oscillation experiments in which particles of a definite flavor are emitted from a localized source. The probability for finding a particle with the wrong flavor must vanish at the position of the source for all times. This condition requires flavor-time and flavor-energy factorizations which determine uniquely the flavor mixture observed at a detector in the oscillation region; i.e. where the overlaps between the wave packets for different mass eigenstates are almost complete. Oscillation periods calculated for ``gedanken'' time-measurement experiments are shown to give the correct measured oscillation wave length in space when multiplied by the group velocity. Examples of neutrinos propagation in a weak field and in a gravitational field are given. In these cases the relative phase is modified differently for measurements in space and time. Energy-momentum (frequency-wave number) and space-time descriptions are complementary, equally valid and give the same results. The two identical phase shifts obtained describe the same physics; adding them together to get a factor of two is double counting. |
hep-ph/0305197 | Wei-Min Sun | Wei-Min Sun, Hong-Shi Zong, Xiang-Song Chen and Fan Wang | A Note on Transverse Axial Vector and Vector Anomalies in U(1) Gauge
Theories | Revtex4, 8 pages, two figures. Largely revised, using the
Pauli-Villars regularization instead of dimensional regularization in the
main proof. Final form to be published in Physics Letters B | Phys.Lett.B569:211-218,2003 | 10.1016/j.physletb.2003.07.033 | null | hep-ph | null | The transverse axial vector and vector anomalies in four-dimensional U(1)
gauge theories studied in [10] is reexamined by means of perturbative methods.
The absence of transverse anomalies for both axial vector and vector current is
verified. We also show that the Pauli-Villars regularization and dimensional
regularization give the same result on the transverse anomaly of both axial
vector and vector current.
| [
{
"created": "Sun, 18 May 2003 01:44:10 GMT",
"version": "v1"
},
{
"created": "Sat, 19 Jul 2003 12:44:07 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Sun",
"Wei-Min",
""
],
[
"Zong",
"Hong-Shi",
""
],
[
"Chen",
"Xiang-Song",
""
],
[
"Wang",
"Fan",
""
]
] | The transverse axial vector and vector anomalies in four-dimensional U(1) gauge theories studied in [10] is reexamined by means of perturbative methods. The absence of transverse anomalies for both axial vector and vector current is verified. We also show that the Pauli-Villars regularization and dimensional regularization give the same result on the transverse anomaly of both axial vector and vector current. |
1605.01114 | Xiangdong Ji | Xiangdong Ji | Proton Tomography Through Deeply Virtual Compton Scattering | 17 pages, 13 figures; Feshbach Prize in theoretical nuclear physics
talk at APS April Meeting, Salt Lake City, April 18, 2016 | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this prize talk, I recall some of the history surrounding the discovery of
deeply virtual Compton scattering, and explain why it is an exciting
experimental tool to obtain novel tomographic pictures of the nucleons at
Jefferson Lab 12 GeV facility and the planned Electron-Ion Collider in the
United States.
| [
{
"created": "Tue, 3 May 2016 23:39:40 GMT",
"version": "v1"
}
] | 2016-05-05 | [
[
"Ji",
"Xiangdong",
""
]
] | In this prize talk, I recall some of the history surrounding the discovery of deeply virtual Compton scattering, and explain why it is an exciting experimental tool to obtain novel tomographic pictures of the nucleons at Jefferson Lab 12 GeV facility and the planned Electron-Ion Collider in the United States. |
hep-ph/9912332 | null | Eef van Beveren (University of Coimbra, Portugal) and George Rupp
(Instituto Superior Tecnico, Lisboa, Portugal) | Scalar mesons as simple quark+antiquark states | 8 pages, plain LaTeX (aipproc style) | AIP Conf. Proc. 508 (1999) 310-317, Hadron Physics, Sept. 1999,
Coimbra, Portugal | null | null | hep-ph | null | The Nijmegen Unitarized Meson Model and its application to scalar mesons is
briefly revisited. It is shown that all scalar states up to 1.5 GeV can be
described as triplet-P-zero quark+antiquark states coupled to the OZI-allowed
open and closed two-meson channels consisting of pseudoscalar and vector
mesons. Crucial are the manifestation of a resonance-doubling phenomenon,
typical for strong S-wave decay, and the employment of truly flavor-symmetric
coupling constants. Also S-wave meson-meson scattering is thus reasonably well
described, without any parameter fit.
| [
{
"created": "Tue, 14 Dec 1999 11:01:54 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"van Beveren",
"Eef",
"",
"University of Coimbra, Portugal"
],
[
"Rupp",
"George",
"",
"Instituto Superior Tecnico, Lisboa, Portugal"
]
] | The Nijmegen Unitarized Meson Model and its application to scalar mesons is briefly revisited. It is shown that all scalar states up to 1.5 GeV can be described as triplet-P-zero quark+antiquark states coupled to the OZI-allowed open and closed two-meson channels consisting of pseudoscalar and vector mesons. Crucial are the manifestation of a resonance-doubling phenomenon, typical for strong S-wave decay, and the employment of truly flavor-symmetric coupling constants. Also S-wave meson-meson scattering is thus reasonably well described, without any parameter fit. |
2008.10911 | Eugene Levin | E. Gotsman (Tel Aviv U.) and E. Levin (Tel Aviv U. and UTFSM) | High energy QCD: multiplicity dependence of quarkonia production | 18pp 15 figures in pdf files | null | 10.1140/epjc/s10052-020-08775-1 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we propose an approach which demonstrates the dependence of
quarkoni production on the multiplicity of the accompanying hadrons. Our
approach is based on the three gluons fusion mechanism, without assuming the
multiplicity dependence of the saturation scale. We show, that we describe the
experimental data, which has a dependence that is much steeper than the
multiplicity of the hadrons.
| [
{
"created": "Tue, 25 Aug 2020 09:45:20 GMT",
"version": "v1"
},
{
"created": "Sun, 8 Nov 2020 07:38:42 GMT",
"version": "v2"
}
] | 2021-02-24 | [
[
"Gotsman",
"E.",
"",
"Tel Aviv U."
],
[
"Levin",
"E.",
"",
"Tel Aviv U. and UTFSM"
]
] | In this paper we propose an approach which demonstrates the dependence of quarkoni production on the multiplicity of the accompanying hadrons. Our approach is based on the three gluons fusion mechanism, without assuming the multiplicity dependence of the saturation scale. We show, that we describe the experimental data, which has a dependence that is much steeper than the multiplicity of the hadrons. |
1412.7814 | Yuhei Miyamoto | Takashi Hiramatsu, Yuhei Miyamoto, Jun'ichi Yokoyama | Effects of thermal fluctuations on thermal inflation | 14 pages, 4 figures | null | 10.1088/1475-7516/2015/03/024 | RESCEU-52/14, YITP-14-100 | hep-ph astro-ph.CO gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The mechanism of thermal inflation, a relatively short period of accelerated
expansion after primordial inflation, is a desirable ingredient for a certain
class of particle physics models if they are not to be in contention with the
cosmology of the early Universe. Though thermal inflation is most simply
described in terms of a thermal effective potential, a thermal environment also
gives rise to thermal fluctuations that must be taken into account. We
numerically study the effects of these thermal fluctuations using lattice
simulations. We conclude that though they do not ruin the thermal inflation
scenario, the phase transition at the end of thermal inflation proceeds through
phase mixing and is therefore not accompanied by the formations of bubbles nor
appreciable amplitude of gravitational waves.
| [
{
"created": "Thu, 25 Dec 2014 11:57:40 GMT",
"version": "v1"
}
] | 2015-06-23 | [
[
"Hiramatsu",
"Takashi",
""
],
[
"Miyamoto",
"Yuhei",
""
],
[
"Yokoyama",
"Jun'ichi",
""
]
] | The mechanism of thermal inflation, a relatively short period of accelerated expansion after primordial inflation, is a desirable ingredient for a certain class of particle physics models if they are not to be in contention with the cosmology of the early Universe. Though thermal inflation is most simply described in terms of a thermal effective potential, a thermal environment also gives rise to thermal fluctuations that must be taken into account. We numerically study the effects of these thermal fluctuations using lattice simulations. We conclude that though they do not ruin the thermal inflation scenario, the phase transition at the end of thermal inflation proceeds through phase mixing and is therefore not accompanied by the formations of bubbles nor appreciable amplitude of gravitational waves. |
2209.01980 | Hong-Hao Zhang | Zhao Zhang, Chengfeng Cai, Hong-Hao Zhang | Hidden SU(2)_D vector dark matter with a scalar septuplet | 26 pages, 4 figures | null | 10.1103/PhysRevD.106.115022 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We propose a vector dark matter model from a hidden SU(2)_D gauge symmetry at
TeV scale. A scalar septuplet is introduced to break the SU(2)_D symmetry
spontaneously. The septuplet also play the role of a portal between the
standard model and the dark sector. We find that there are two different vacuum
configurations corresponding to the sign of the quartic coupling $\lambda_3$,
which yields different mass spectrum for the gauge bosons. For a $\lambda_3<0$,
the masses of gauge bosons are splitting, while for a $\lambda_3\geq0$, the
masses are degenerate. We also study the RG evolutions of the couplings, and
find that the perturbativity and vacuum stability can set a stringent bound on
the parameter space. For the phenomenological aspect, we consider the
experimental constraints including dark matter direct detection, indirect
detection, relic density, and Higgs couplings measurements. We find that there
are parameter space survive from all the constraints, and they can be tested in
future dark matter direct and indirect detection experiments.
| [
{
"created": "Mon, 5 Sep 2022 14:25:42 GMT",
"version": "v1"
}
] | 2023-01-04 | [
[
"Zhang",
"Zhao",
""
],
[
"Cai",
"Chengfeng",
""
],
[
"Zhang",
"Hong-Hao",
""
]
] | We propose a vector dark matter model from a hidden SU(2)_D gauge symmetry at TeV scale. A scalar septuplet is introduced to break the SU(2)_D symmetry spontaneously. The septuplet also play the role of a portal between the standard model and the dark sector. We find that there are two different vacuum configurations corresponding to the sign of the quartic coupling $\lambda_3$, which yields different mass spectrum for the gauge bosons. For a $\lambda_3<0$, the masses of gauge bosons are splitting, while for a $\lambda_3\geq0$, the masses are degenerate. We also study the RG evolutions of the couplings, and find that the perturbativity and vacuum stability can set a stringent bound on the parameter space. For the phenomenological aspect, we consider the experimental constraints including dark matter direct detection, indirect detection, relic density, and Higgs couplings measurements. We find that there are parameter space survive from all the constraints, and they can be tested in future dark matter direct and indirect detection experiments. |
1912.11689 | Nikolai Krasnikov | N.V. Krasnikov | Implications of last NA64 results and the electron $g_{e}-2$ anomaly for
the X(16.7) boson survival | 6 pages | null | 10.1142/S0217732320501163 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We point out that last NA64 bound on coupling constant of hypothetical
$X(16.7 MeV)$ vector boson with electrons plus the recent value of the
anomalous electron magnetic moment exclude at 90 \% C.L. purely vector or axial
vector couplings of $X(16.7)$ boson with electrons. Models with nonzero $V \pm
A$ coupling constant with electron survive and they can explain both the
electron and muon $g - 2$ anomalies.
| [
{
"created": "Wed, 25 Dec 2019 16:34:25 GMT",
"version": "v1"
}
] | 2020-06-24 | [
[
"Krasnikov",
"N. V.",
""
]
] | We point out that last NA64 bound on coupling constant of hypothetical $X(16.7 MeV)$ vector boson with electrons plus the recent value of the anomalous electron magnetic moment exclude at 90 \% C.L. purely vector or axial vector couplings of $X(16.7)$ boson with electrons. Models with nonzero $V \pm A$ coupling constant with electron survive and they can explain both the electron and muon $g - 2$ anomalies. |
2311.05564 | Amit Tiwari | Adeela Afzal, Qaisar Shafi, Amit Tiwari | Gravitational wave emission from metastable current-carrying strings in
$E_6$ | We added a paragraph summarizing Section 2 at the end of Section 2
for better clarity | Phys.Lett.B 850 (2024) 138516 | 10.1016/j.physletb.2024.138516 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We discuss $E_6$ based extensions of the Standard Model (SM) containing two
varieties of superheavy metastable cosmic strings (CSs) that respectively have
neutral and electrically charged current carriers. We employ an extended
version of the velocity-dependent one-scale (VOS) model, recently discussed by
some authors, to estimate the gravitational wave (GW) spectrum emitted by
metastable strings with a dimensionless string tension $G \mu \approx 10^{-6}$
that carry a right-handed neutrino (RHN) current. We find that with a low to
moderate amount of current, the spectrum is compatible with the LIGO O3 run and
also consistent at the 1$\sigma$ level with the recent PTA signals.
| [
{
"created": "Thu, 9 Nov 2023 18:20:04 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Feb 2024 17:25:12 GMT",
"version": "v2"
}
] | 2024-02-15 | [
[
"Afzal",
"Adeela",
""
],
[
"Shafi",
"Qaisar",
""
],
[
"Tiwari",
"Amit",
""
]
] | We discuss $E_6$ based extensions of the Standard Model (SM) containing two varieties of superheavy metastable cosmic strings (CSs) that respectively have neutral and electrically charged current carriers. We employ an extended version of the velocity-dependent one-scale (VOS) model, recently discussed by some authors, to estimate the gravitational wave (GW) spectrum emitted by metastable strings with a dimensionless string tension $G \mu \approx 10^{-6}$ that carry a right-handed neutrino (RHN) current. We find that with a low to moderate amount of current, the spectrum is compatible with the LIGO O3 run and also consistent at the 1$\sigma$ level with the recent PTA signals. |
2211.13212 | Aurora Ireland | Aurora Ireland, Seth Koren | Asymmetric Reheating via Inverse Symmetry Breaking | 8 pages, 4 figures; v3: accepted for publication in PRD | null | null | null | hep-ph astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | Asymmetric reheating is a generic requirement for models of dark sectors with
light species, but its implementation is usually in tension with unique
phenomenologies otherwise possible in compelling theories containing dark
copies of the Standard Model. We present a simple module to implement
asymmetric reheating during a $\mathbb{Z}_2$-breaking phase above some critical
temperature. This reinvigorates the possibility of an exactly degenerate mirror
sector and the striking phenomenology of composite particles oscillating into
their mirror counterparts.
| [
{
"created": "Wed, 23 Nov 2022 18:54:07 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Sep 2023 00:11:55 GMT",
"version": "v2"
},
{
"created": "Wed, 24 Apr 2024 04:23:33 GMT",
"version": "v3"
}
] | 2024-04-25 | [
[
"Ireland",
"Aurora",
""
],
[
"Koren",
"Seth",
""
]
] | Asymmetric reheating is a generic requirement for models of dark sectors with light species, but its implementation is usually in tension with unique phenomenologies otherwise possible in compelling theories containing dark copies of the Standard Model. We present a simple module to implement asymmetric reheating during a $\mathbb{Z}_2$-breaking phase above some critical temperature. This reinvigorates the possibility of an exactly degenerate mirror sector and the striking phenomenology of composite particles oscillating into their mirror counterparts. |
hep-ph/0609128 | Cheng-Wei Chiang | Cheng-Wei Chiang and Yu-Feng Zhou | Flavor SU(3) analysis of charmless B meson decays to two pseudoscalar
mesons | 22 pages and 2 figures; some comments and references added; more
references added, version to appear in journal | JHEP 0612:027,2006 | 10.1088/1126-6708/2006/12/027 | KEK TH-1103 | hep-ph hep-ex | null | Global fits to charmless B --> PP decays in the framework of flavor SU(3)
symmetry are updated and improved without reference to the \sin2\beta measured
from the charmonium decay modes. Fit results directly constrain the
(\bar\rho,\bar\eta) vertex of the unitarity triangle, and are used to predict
the branching ratios and CP asymmetries of all decay modes, including those of
the B_s system. Different schemes of SU(3) breaking in decay amplitude sizes
are analyzed. The major breaking effect between strangeness-conserving and
strangeness-changing decays can be accounted for by including a ratio of decay
constants in tree and color-suppressed amplitudes. The possibility of having a
new physics contribution to K \pi decays is also examined from the data fitting
point of view.
| [
{
"created": "Wed, 13 Sep 2006 14:31:13 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Oct 2006 07:24:37 GMT",
"version": "v2"
},
{
"created": "Thu, 16 Nov 2006 08:55:59 GMT",
"version": "v3"
}
] | 2011-03-23 | [
[
"Chiang",
"Cheng-Wei",
""
],
[
"Zhou",
"Yu-Feng",
""
]
] | Global fits to charmless B --> PP decays in the framework of flavor SU(3) symmetry are updated and improved without reference to the \sin2\beta measured from the charmonium decay modes. Fit results directly constrain the (\bar\rho,\bar\eta) vertex of the unitarity triangle, and are used to predict the branching ratios and CP asymmetries of all decay modes, including those of the B_s system. Different schemes of SU(3) breaking in decay amplitude sizes are analyzed. The major breaking effect between strangeness-conserving and strangeness-changing decays can be accounted for by including a ratio of decay constants in tree and color-suppressed amplitudes. The possibility of having a new physics contribution to K \pi decays is also examined from the data fitting point of view. |
2401.16673 | Wei Kou | Wei Kou and Xurong Chen | Exploring quantum entanglement in chiral symmetry partial restoration
with 1+1 string model | 8 pages, 3 figures and 1 table, published in Physics letter B | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Within the confining color flux tube picture, we assess the color electric
field generated by quark-antiquark pairs within the framework of the Schwinger
model and estimate its impact on the chiral condensate. We observe differences
in the distribution of the color flux tube generated by quark-antiquark pairs
at different separation distances, leading to discrepancies in the partial
restoration of chiral symmetry. Furthermore, we suggest incorporating the color
magnetic field in the calculation of chiral condensate, leading to quantum
entanglement effects, and proceed to compute the entanglement entropy. We
observe that the entanglement entropy increases with the distance of the color
source (the separation distance between quark and anti-quark), and the
magnitude of the color electric field and chiral condensate restoration after
spatial integration also increases with the distance of the color source. Then,
we try to provide a qualitative explanation for the existence of these
phenomena.
| [
{
"created": "Tue, 30 Jan 2024 01:47:35 GMT",
"version": "v1"
},
{
"created": "Mon, 6 May 2024 12:38:00 GMT",
"version": "v2"
}
] | 2024-05-07 | [
[
"Kou",
"Wei",
""
],
[
"Chen",
"Xurong",
""
]
] | Within the confining color flux tube picture, we assess the color electric field generated by quark-antiquark pairs within the framework of the Schwinger model and estimate its impact on the chiral condensate. We observe differences in the distribution of the color flux tube generated by quark-antiquark pairs at different separation distances, leading to discrepancies in the partial restoration of chiral symmetry. Furthermore, we suggest incorporating the color magnetic field in the calculation of chiral condensate, leading to quantum entanglement effects, and proceed to compute the entanglement entropy. We observe that the entanglement entropy increases with the distance of the color source (the separation distance between quark and anti-quark), and the magnitude of the color electric field and chiral condensate restoration after spatial integration also increases with the distance of the color source. Then, we try to provide a qualitative explanation for the existence of these phenomena. |
0907.4234 | Kazuki Sakurai | Sung-Gi Kim, Nobuhiro Maekawa, Keiko I. Nagao, Mihoko M. Nojiri,
Kazuki Sakurai | LHC signature of supersymmetric models with non-universal sfermion
masses | 36 pages, 17 figures | JHEP 0910:005,2009 | 10.1088/1126-6708/2009/10/005 | KEK-TH-1324 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the LHC signature of the minimal supersymmetric standard model with
non-universal sfermion masses. In the model, soft masses of gauginos and the
3rd generation of 10 of SU(5) are around the weak scale, while other sfermion
soft mass is universal and around a few TeV. Such sfermion mass spectrum is
motivated not only from flavor, CP and naturalness constraints but also from
E_6 grand unified model with non-Abelian horizontal (flavor) symmetry. The
characteristic signature of the model at the LHC is the dominance of the events
with 4 b partons in the final state together with high rate of mildly boosted
top quark arising from gluino decay. The prominent high p_T jet also arises
from squark decay. We show it is possible to find the characteristic signature
in the early stage of the LHC. The discrimination of our scenario from some
CMSSM model points with similar signature may be possible with large integrated
luminosity. The result of sparticle mass measurement using exclusive channel
with the help of hemisphere analysis, and inclusive measurement of gluino and
squark masses using M_{T2} and M_{T2}^{min} in some representative model points
are presented.
| [
{
"created": "Fri, 24 Jul 2009 08:43:00 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Jul 2009 06:08:48 GMT",
"version": "v2"
},
{
"created": "Sun, 30 Aug 2009 10:26:57 GMT",
"version": "v3"
}
] | 2010-03-02 | [
[
"Kim",
"Sung-Gi",
""
],
[
"Maekawa",
"Nobuhiro",
""
],
[
"Nagao",
"Keiko I.",
""
],
[
"Nojiri",
"Mihoko M.",
""
],
[
"Sakurai",
"Kazuki",
""
]
] | We study the LHC signature of the minimal supersymmetric standard model with non-universal sfermion masses. In the model, soft masses of gauginos and the 3rd generation of 10 of SU(5) are around the weak scale, while other sfermion soft mass is universal and around a few TeV. Such sfermion mass spectrum is motivated not only from flavor, CP and naturalness constraints but also from E_6 grand unified model with non-Abelian horizontal (flavor) symmetry. The characteristic signature of the model at the LHC is the dominance of the events with 4 b partons in the final state together with high rate of mildly boosted top quark arising from gluino decay. The prominent high p_T jet also arises from squark decay. We show it is possible to find the characteristic signature in the early stage of the LHC. The discrimination of our scenario from some CMSSM model points with similar signature may be possible with large integrated luminosity. The result of sparticle mass measurement using exclusive channel with the help of hemisphere analysis, and inclusive measurement of gluino and squark masses using M_{T2} and M_{T2}^{min} in some representative model points are presented. |
hep-ph/9807273 | Luca Silvestrini | A. Masiero and L. Silvestrini | Pre-LHC SUSY Searches: an Overview | LaTeX, 23 pages, invited talks given by A. Masiero at the Tropical
Workshop on Particle Physics and Cosmology and at the Second Latin American
Symposium on High Energy Physics, Puerto Rico, April 1-10, 1998 | null | 10.1063/1.56593 | TUM-HEP-318/98 | hep-ph | null | We discuss the prospects for searches of low-energy supersymmetry in the time
interval separating us from the advent of LHC. In this period of time
"indirect" searches may play a very relevant role. We refer to manifestations
of supersymmetry in flavour changing neutral current and CP violating phenomena
and to signals of the lightest supersymmetric particle in searches of dark
matter. In the first part of the talk we critically review the status of the
minimal supersymmetric model to discuss the chances that direct and indirect
supersymmetric searches may have before the LHC start. In the second part we
point out what we consider to be the most promising grounds where departures
from the standard model prediction may signal the presence of new physics,
possibly of supersymmetric nature. We argue that the often invoked
complementarity of direct and indirect searches of low-energy supersymmetry is
becoming even more true in the pre-LHC era.
| [
{
"created": "Tue, 7 Jul 1998 13:07:18 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Masiero",
"A.",
""
],
[
"Silvestrini",
"L.",
""
]
] | We discuss the prospects for searches of low-energy supersymmetry in the time interval separating us from the advent of LHC. In this period of time "indirect" searches may play a very relevant role. We refer to manifestations of supersymmetry in flavour changing neutral current and CP violating phenomena and to signals of the lightest supersymmetric particle in searches of dark matter. In the first part of the talk we critically review the status of the minimal supersymmetric model to discuss the chances that direct and indirect supersymmetric searches may have before the LHC start. In the second part we point out what we consider to be the most promising grounds where departures from the standard model prediction may signal the presence of new physics, possibly of supersymmetric nature. We argue that the often invoked complementarity of direct and indirect searches of low-energy supersymmetry is becoming even more true in the pre-LHC era. |
hep-ph/0612332 | Jonathan Rosner | Jonathan L. Rosner | Heavy Quark Spectroscopy -- Theory Overview | 13 pages, 6 figures. Presented at Second Meeting of APS Topical Group
on Hadron Physics, Nashville, TN, 22-24. Proceedings to be published by
Journal of Physics (UK), Conference Series. Uses jpconf.cls, jpconf11.clo.
Some corrections; references updated | J.Phys.Conf.Ser.69:012002,2007 | 10.1088/1742-6596/69/1/012002 | EFI 06-25 | hep-ph | null | Some recent discoveries in the spectroscopy of hadrons containing heavy
quarks, and some of their theoretical interpretations, are reviewed.
| [
{
"created": "Tue, 26 Dec 2006 22:25:38 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Jan 2007 02:42:24 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Rosner",
"Jonathan L.",
""
]
] | Some recent discoveries in the spectroscopy of hadrons containing heavy quarks, and some of their theoretical interpretations, are reviewed. |
hep-ph/9905207 | Thomas Paul | T. Paul, J. Swain and Z. Was | Library of anomalous tau-tau-gamma couplings for tau+ tau- (n gamma)
Monte Carlo programs | 4 pages | null | null | CERN-TH/99-121 | hep-ph | null | We briefly describe a library that may be used with any e+ e- --> tau+ tau-
(n gamma) Monte Carlo program to account for the effects of anomalous
tau-tau-gamma couplings. The implementation of this library in KORALZ version
4.04 is discussed.
| [
{
"created": "Mon, 3 May 1999 14:27:37 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Paul",
"T.",
""
],
[
"Swain",
"J.",
""
],
[
"Was",
"Z.",
""
]
] | We briefly describe a library that may be used with any e+ e- --> tau+ tau- (n gamma) Monte Carlo program to account for the effects of anomalous tau-tau-gamma couplings. The implementation of this library in KORALZ version 4.04 is discussed. |
hep-ph/0511248 | Alicia Broncano | A. Anisimov, A. Broncano, M. Plumacher | The CP-asymmetry in resonant leptogenesis | 15 pages | Nucl.Phys. B737 (2006) 176-189 | 10.1016/j.nuclphysb.2006.01.003 | MPP-2005-147 | hep-ph | null | We study the resonantly enhanced CP-asymmetry in the decays of nearly
mass-degenerate heavy right-handed Majorana neutrinos for which different
formulae have been presented in the literature, depending on the method used to
calculate it. We consider two different techniques and show that they lead to
the same result, thereby reconciling the different approaches.
| [
{
"created": "Mon, 21 Nov 2005 13:54:49 GMT",
"version": "v1"
}
] | 2010-04-05 | [
[
"Anisimov",
"A.",
""
],
[
"Broncano",
"A.",
""
],
[
"Plumacher",
"M.",
""
]
] | We study the resonantly enhanced CP-asymmetry in the decays of nearly mass-degenerate heavy right-handed Majorana neutrinos for which different formulae have been presented in the literature, depending on the method used to calculate it. We consider two different techniques and show that they lead to the same result, thereby reconciling the different approaches. |
2112.15122 | Andrew Larkoski | Andrew J. Larkoski | Jet Physics from the Ground Up | 4 hour-long lectures; 32 pages; 29 figures; based on material from
arXiv:1709.06195 and arXiv:2008.09673 | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | These are lecture notes presented at the online 2021 QUC Winter School on
Energy Frontier hosted by the Korea Institute for Advanced Study. They extend
lectures presented at the 2017 and 2018 CTEQ summer schools and the 2020 Hadron
Collider Physics Summer School hosted by Fermilab. Jets in quantum
chromodynamics (QCD) are motivated from familiar results in classical
electricity and magnetism, through identification of structures that exhibit
approximate scale invariance. From this point, an effective description of QCD
jets is developed from simple assumptions that necessitate all-orders
resummation for obtaining finite results. With machine learning becoming an
increasingly important tool of particle physics, I discuss its utility
exclusively from the biased view for increasing human knowledge. A simple
argument that the likelihood for quark versus gluon discrimination is infrared
and collinear safe is presented as an example of this approach. End-of-lecture
exercises are also provided.
| [
{
"created": "Thu, 30 Dec 2021 16:39:37 GMT",
"version": "v1"
}
] | 2022-01-03 | [
[
"Larkoski",
"Andrew J.",
""
]
] | These are lecture notes presented at the online 2021 QUC Winter School on Energy Frontier hosted by the Korea Institute for Advanced Study. They extend lectures presented at the 2017 and 2018 CTEQ summer schools and the 2020 Hadron Collider Physics Summer School hosted by Fermilab. Jets in quantum chromodynamics (QCD) are motivated from familiar results in classical electricity and magnetism, through identification of structures that exhibit approximate scale invariance. From this point, an effective description of QCD jets is developed from simple assumptions that necessitate all-orders resummation for obtaining finite results. With machine learning becoming an increasingly important tool of particle physics, I discuss its utility exclusively from the biased view for increasing human knowledge. A simple argument that the likelihood for quark versus gluon discrimination is infrared and collinear safe is presented as an example of this approach. End-of-lecture exercises are also provided. |
hep-ph/0202212 | C. S. Kim | G. Cvetic, C. Dib, C. S. Kim and J. D. Kim | On Lepton Flavor Violation in Tau Decays | 19 pages, 5 ps-figures; minor changes, accepted for publication in
Phys. Rev. D | Phys.Rev.D66:034008,2002; Erratum-ibid.D68:059901,2003 | 10.1103/PhysRevD.66.034008 10.1103/PhysRevD.68.059901 | USM-TH-123 | hep-ph | null | We study lepton flavor violation (LFV) in tau decays induced by heavy
Majorana neutrinos within two models: (I) the Standard Model with additional
right-handed heavy Majorana neutrinos, i.e., a typical seesaw-type model; (II)
the Standard Model with left-handed and right-handed neutral singlets, which
are inspired by certain scenarios of SO(10)models and heterotic superstring
models with E_6 symmetry. We calculate various LFV branching ratios and a T-odd
asymmetry. The seesaw Model I predicts very small branching ratios for LFV
processes in most of the parameter space, although in a very restricted
parameter region it can reach maximal branching ratios Br(tau to mu gamma)
approx 10^-9 and Br(tau to 3mu) approx 10^-10. In contrast, Model II may show
branching ratios Br(tau to e gamma) approx 10^-8 and Br(tau to 3e) < 10^-9,
over a sizable region of the parameter space, large enough to be tested by
experiments in the near future.
| [
{
"created": "Fri, 22 Feb 2002 13:06:43 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Jun 2002 16:15:54 GMT",
"version": "v2"
},
{
"created": "Thu, 27 Jun 2002 21:49:15 GMT",
"version": "v3"
}
] | 2014-11-17 | [
[
"Cvetic",
"G.",
""
],
[
"Dib",
"C.",
""
],
[
"Kim",
"C. S.",
""
],
[
"Kim",
"J. D.",
""
]
] | We study lepton flavor violation (LFV) in tau decays induced by heavy Majorana neutrinos within two models: (I) the Standard Model with additional right-handed heavy Majorana neutrinos, i.e., a typical seesaw-type model; (II) the Standard Model with left-handed and right-handed neutral singlets, which are inspired by certain scenarios of SO(10)models and heterotic superstring models with E_6 symmetry. We calculate various LFV branching ratios and a T-odd asymmetry. The seesaw Model I predicts very small branching ratios for LFV processes in most of the parameter space, although in a very restricted parameter region it can reach maximal branching ratios Br(tau to mu gamma) approx 10^-9 and Br(tau to 3mu) approx 10^-10. In contrast, Model II may show branching ratios Br(tau to e gamma) approx 10^-8 and Br(tau to 3e) < 10^-9, over a sizable region of the parameter space, large enough to be tested by experiments in the near future. |
hep-ph/0006283 | Uwe Gunther | U. Guenther, A. Zhuk | A note on dynamical stabilization of internal spaces in multidimensional
cosmology | 15 pages, LaTeX2e | Class.Quant.Grav.18:1441-1460,2001 | 10.1088/0264-9381/18/8/303 | null | hep-ph astro-ph gr-qc hep-th | null | The possibility of dynamical stabilization of an internal space is
investigated for a multidimensional cosmological model with minimal coupled
scalar field as inflaton. It is shown that a successful dynamical
compactification crucially depends on the type of interaction between the
geometrical modulus field and the inflaton and its decay products. In the
considered model a stable compactification can be ensured via trapping of the
modulus field by a minimum of the effective potential.
| [
{
"created": "Sat, 24 Jun 2000 22:18:25 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Guenther",
"U.",
""
],
[
"Zhuk",
"A.",
""
]
] | The possibility of dynamical stabilization of an internal space is investigated for a multidimensional cosmological model with minimal coupled scalar field as inflaton. It is shown that a successful dynamical compactification crucially depends on the type of interaction between the geometrical modulus field and the inflaton and its decay products. In the considered model a stable compactification can be ensured via trapping of the modulus field by a minimum of the effective potential. |
hep-ph/0607267 | Sergio Pastor | Gianpiero Mangano, Gennaro Miele, Sergio Pastor, Teguayco Pinto,
Ofelia Pisanti, Pasquale D. Serpico | Effects of non-standard neutrino-electron interactions on relic neutrino
decoupling | 23 pages, 5 figures. To be published in NPB | Nucl.Phys. B756 (2006) 100-116 | 10.1016/j.nuclphysb.2006.09.002 | DSF-23/2006, IFIC/06-24, MPP-2006-80 | hep-ph astro-ph | null | We consider the decoupling of neutrinos in the early Universe in presence of
non-standard neutral current neutrino-electron interactions (NSI). We first
discuss a semi-analytical approach to solve the relevant kinetic equations and
then present the results of fully numerical and momentum-dependent
calculations, including flavor neutrino oscillations. We present our results in
terms of both the effective number of neutrino species (N_eff) and the impact
on the abundance of He-4 produced during Big Bang Nucleosynthesis. We find
that, for NSI parameters within the ranges allowed by present laboratory data,
non-standard neutrino-electron interactions do not essentially modify the
density of relic neutrinos nor the bounds on neutrino properties from
cosmological observables, such as their mass. Nonetheless, the presence of
neutrino-electron NSI may enhance the entropy transfer from electron-positron
pairs into neutrinos instead of photons, up to a value of N_eff=3.12. This is
almost three times the correction to N_eff=3 that appears for standard weak
interactions.
| [
{
"created": "Tue, 25 Jul 2006 13:23:25 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Sep 2006 10:02:36 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Mangano",
"Gianpiero",
""
],
[
"Miele",
"Gennaro",
""
],
[
"Pastor",
"Sergio",
""
],
[
"Pinto",
"Teguayco",
""
],
[
"Pisanti",
"Ofelia",
""
],
[
"Serpico",
"Pasquale D.",
""
]
] | We consider the decoupling of neutrinos in the early Universe in presence of non-standard neutral current neutrino-electron interactions (NSI). We first discuss a semi-analytical approach to solve the relevant kinetic equations and then present the results of fully numerical and momentum-dependent calculations, including flavor neutrino oscillations. We present our results in terms of both the effective number of neutrino species (N_eff) and the impact on the abundance of He-4 produced during Big Bang Nucleosynthesis. We find that, for NSI parameters within the ranges allowed by present laboratory data, non-standard neutrino-electron interactions do not essentially modify the density of relic neutrinos nor the bounds on neutrino properties from cosmological observables, such as their mass. Nonetheless, the presence of neutrino-electron NSI may enhance the entropy transfer from electron-positron pairs into neutrinos instead of photons, up to a value of N_eff=3.12. This is almost three times the correction to N_eff=3 that appears for standard weak interactions. |
hep-ph/9502240 | Yasuhiro Okada | Yasuhiro Okada (KEK) | SUSY and CP Violation | 14pages, figures not included, to appear in the Proceedings of 1994
International Workshop on B Physics, October 26-28 1994, Nagoya, Japan. | null | null | KEK Preprint 94-192, KEK-TH-428 | hep-ph | null | Flavor changing neutral current and CP violating processes are discussed in
the minimal supergravity model. The constraint on charged Higgs mass from the
new measurement of the inclusive branching ratio of the $b\rightarrow s\gamma$
process is obtained. The $B^0_d-\bar{B}^0_d$ mixing parameter ($x_d$) and the
CP violating parameter in the $K^0-\bar{K}^0$ mixing ($\epsilon _K$) are
calculated in this model and it is shown that these parameters can be enhanced
by 10\% $\sim$ 20 \% compared to the prediction within the standard model.
Impacts on new physics search at B factories are also discussed.
| [
{
"created": "Tue, 7 Feb 1995 06:28:35 GMT",
"version": "v1"
}
] | 2016-09-01 | [
[
"Okada",
"Yasuhiro",
"",
"KEK"
]
] | Flavor changing neutral current and CP violating processes are discussed in the minimal supergravity model. The constraint on charged Higgs mass from the new measurement of the inclusive branching ratio of the $b\rightarrow s\gamma$ process is obtained. The $B^0_d-\bar{B}^0_d$ mixing parameter ($x_d$) and the CP violating parameter in the $K^0-\bar{K}^0$ mixing ($\epsilon _K$) are calculated in this model and it is shown that these parameters can be enhanced by 10\% $\sim$ 20 \% compared to the prediction within the standard model. Impacts on new physics search at B factories are also discussed. |
hep-ph/0611249 | Yasunori Nomura | Yasunori Nomura and David Poland | Predictive Supersymmetry from Criticality | 18 pages, 4 figures, reference added | Phys.Lett.B648:213-223,2007 | 10.1016/j.physletb.2007.03.012 | UCB-PTH-06/20, LBNL-61989 | hep-ph hep-th | null | Motivated by the absence of any direct signal of new physics so far, we
present a simple supersymmetric model in which the up-type Higgs mass-squared
parameter crosses zero at a scale close to the weak scale. Such a theory may be
motivated either by the conventional naturalness picture or by the landscape
picture with certain assumptions on prior probability distributions of
parameters. The model arises from a simple higher dimensional setup in which
the gauge and Higgs fields propagate in the bulk while the matter fields are on
a brane. The soft supersymmetry breaking parameters receive contributions from
both moduli and anomaly mediations, and their weak scale values can be
analytically solved for in terms of a single overall mass scale M. The expected
size for M depends on whether one adopts the naturalness or landscape pictures,
allowing for the possibility of distinguishing between these two cases. We also
present possible variations of the model, and discuss more general implications
of the landscape picture in this context.
| [
{
"created": "Sun, 19 Nov 2006 00:56:07 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Dec 2006 21:09:59 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Nomura",
"Yasunori",
""
],
[
"Poland",
"David",
""
]
] | Motivated by the absence of any direct signal of new physics so far, we present a simple supersymmetric model in which the up-type Higgs mass-squared parameter crosses zero at a scale close to the weak scale. Such a theory may be motivated either by the conventional naturalness picture or by the landscape picture with certain assumptions on prior probability distributions of parameters. The model arises from a simple higher dimensional setup in which the gauge and Higgs fields propagate in the bulk while the matter fields are on a brane. The soft supersymmetry breaking parameters receive contributions from both moduli and anomaly mediations, and their weak scale values can be analytically solved for in terms of a single overall mass scale M. The expected size for M depends on whether one adopts the naturalness or landscape pictures, allowing for the possibility of distinguishing between these two cases. We also present possible variations of the model, and discuss more general implications of the landscape picture in this context. |
1903.11604 | Jonathan Kozaczuk | Oliver Gould, Jonathan Kozaczuk, Lauri Niemi, Michael J.
Ramsey-Musolf, Tuomas V. I. Tenkanen, David J. Weir | Nonperturbative analysis of the gravitational waves from a first-order
electroweak phase transition | 18 pages + references, 6 figures | Phys. Rev. D 100, 115024 (2019) | 10.1103/PhysRevD.100.115024 | ACFI T19-04, HIP-2019-5/TH | hep-ph astro-ph.CO hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the first end-to-end nonperturbative analysis of the gravitational
wave power spectrum from a thermal first-order electroweak phase transition
(EWPT), using the framework of dimensionally reduced effective field theory and
pre-existing nonperturbative simulation results. We are able to show that a
first-order EWPT in any beyond the Standard Model (BSM) scenario that can be
described by a Standard Model-like effective theory at long distances will
produce gravitational wave signatures too weak to be observed at existing and
planned detectors. This implies that colliders are likely to provide the best
chance of exploring the phase structure of such theories, while transitions
strong enough to be detected at gravitational wave experiments require either
previously neglected higher-dimension operators or light BSM fields to be
included in the dimensionally reduced effective theory and therefore
necessitate dedicated nonperturbative studies. As a concrete application, we
analyze the real singlet-extended Standard Model and identify regions of
parameter space with single-step first-order transitions, comparing our
findings to those obtained using a fully perturbative method. We discuss the
prospects for exploring the electroweak phase diagram in this model at collider
and gravitational wave experiments in light of our nonperturbative results.
| [
{
"created": "Wed, 27 Mar 2019 18:00:00 GMT",
"version": "v1"
}
] | 2019-12-18 | [
[
"Gould",
"Oliver",
""
],
[
"Kozaczuk",
"Jonathan",
""
],
[
"Niemi",
"Lauri",
""
],
[
"Ramsey-Musolf",
"Michael J.",
""
],
[
"Tenkanen",
"Tuomas V. I.",
""
],
[
"Weir",
"David J.",
""
]
] | We present the first end-to-end nonperturbative analysis of the gravitational wave power spectrum from a thermal first-order electroweak phase transition (EWPT), using the framework of dimensionally reduced effective field theory and pre-existing nonperturbative simulation results. We are able to show that a first-order EWPT in any beyond the Standard Model (BSM) scenario that can be described by a Standard Model-like effective theory at long distances will produce gravitational wave signatures too weak to be observed at existing and planned detectors. This implies that colliders are likely to provide the best chance of exploring the phase structure of such theories, while transitions strong enough to be detected at gravitational wave experiments require either previously neglected higher-dimension operators or light BSM fields to be included in the dimensionally reduced effective theory and therefore necessitate dedicated nonperturbative studies. As a concrete application, we analyze the real singlet-extended Standard Model and identify regions of parameter space with single-step first-order transitions, comparing our findings to those obtained using a fully perturbative method. We discuss the prospects for exploring the electroweak phase diagram in this model at collider and gravitational wave experiments in light of our nonperturbative results. |
hep-ph/9706236 | null | Stanley J. Brodsky | The Light-Cone Fock State Expansion and Hadron Physics Phenomenology | LaTex, 10 pages | null | null | SLAC-PUB-7542 | hep-ph | null | The ensemble of light-cone Fock wavefunctions $\{\psi_{n/H}(x_i,\vec k_{\perp
i},\lambda_i)\}$ provides a conceptual basis for representing physical hadrons
and nuclei in terms of their fundamental quark and gluon degrees of freedom. A
number of applications of the light-cone formalism to QCD phenomenology are
briefly reviewed, such as the origin of Regge behavior of polarized structure
functions, the high momentum transfer behavior of exclusive reactions, the
color transparency properties of diffractive vector meson photoproduction, and
the behavior of quark distributions at large $x_{bj}$. The light-cone formalism
illuminates novel features of hadron physics, such as the intrinsic gluon and
heavy quark distributions, the quark - antiquark asymmetry of the intrinsic
heavy quark sea, and the importance of rearrangement mechanisms in heavy
quarkonium decay. I also discuss the potential for measuring the shape of the
valence light-cone Fock wavefunction of hadrons and photons in nuclear
diffractive multi-jet production.
| [
{
"created": "Tue, 3 Jun 1997 20:57:43 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Brodsky",
"Stanley J.",
""
]
] | The ensemble of light-cone Fock wavefunctions $\{\psi_{n/H}(x_i,\vec k_{\perp i},\lambda_i)\}$ provides a conceptual basis for representing physical hadrons and nuclei in terms of their fundamental quark and gluon degrees of freedom. A number of applications of the light-cone formalism to QCD phenomenology are briefly reviewed, such as the origin of Regge behavior of polarized structure functions, the high momentum transfer behavior of exclusive reactions, the color transparency properties of diffractive vector meson photoproduction, and the behavior of quark distributions at large $x_{bj}$. The light-cone formalism illuminates novel features of hadron physics, such as the intrinsic gluon and heavy quark distributions, the quark - antiquark asymmetry of the intrinsic heavy quark sea, and the importance of rearrangement mechanisms in heavy quarkonium decay. I also discuss the potential for measuring the shape of the valence light-cone Fock wavefunction of hadrons and photons in nuclear diffractive multi-jet production. |
1710.02256 | Philipp Gubler | Philipp Gubler, Daisuke Satow | Finite temperature sum rules in the vector channel at finite momentum | 21 pages, 10 figures; published version | Phys. Rev. D 96, 114028 (2017) | 10.1103/PhysRevD.96.114028 | null | hep-ph hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Exact sum rules for the longitudinal and transverse part of the vector
channel spectral functions at nonzero momentum are derived in the first part of
the paper. The sum rules are formulated for the finite temperature spectral
functions, from which the vacuum component has been subtracted, and represent a
generalization of previous work in which sum rules were derived only for the
zero-momentum limit. In the second part of the paper, we demonstrate how the
sum rules can be used as constraints in spectral fits to lattice data at
various temperatures, with the latest dynamical lattice QCD data at zero
momentum.
| [
{
"created": "Fri, 6 Oct 2017 01:57:37 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Dec 2017 15:52:18 GMT",
"version": "v2"
}
] | 2018-01-01 | [
[
"Gubler",
"Philipp",
""
],
[
"Satow",
"Daisuke",
""
]
] | Exact sum rules for the longitudinal and transverse part of the vector channel spectral functions at nonzero momentum are derived in the first part of the paper. The sum rules are formulated for the finite temperature spectral functions, from which the vacuum component has been subtracted, and represent a generalization of previous work in which sum rules were derived only for the zero-momentum limit. In the second part of the paper, we demonstrate how the sum rules can be used as constraints in spectral fits to lattice data at various temperatures, with the latest dynamical lattice QCD data at zero momentum. |
1204.2902 | Tho Hue Le | P. T. Giang, L. T. Hue, D. T. Huong, H. N. Long | Lepton-flavor violating decays of neutral Higgs to muon and tauon in
supersymmetric economical 3-3-1 model | Journal version | Nuclear Physics B, 864 (2012) 85-112 | 10.1016/j.nuclphysb.2012.06.008 | null | hep-ph | http://creativecommons.org/licenses/publicdomain/ | We investigate Lepton-Flavor Violating (LFV) decays of Higgs to muon-tau in
the supersymmetric economical 3-3-1 (SUSYE331) model. In the presence of flavor
mixing in sleptons {mu,tau} and large values of v/v', the ratio of Br(H
-->tau^+mu^-)/Br(H -->tau^+tau^-) can reach to non-negligible values
O(10^{-3}), as in many known SUSY models. We predict that for the Standard
Model Higgs boson, the LHC may detect its decay to muon and tauon. We also
investigate the asymmetry between left and right LFV values of corrections and
prove that the LFV effects are dominated by the left FLV term, which is O(10^3)
times larger than the right LFV term in the limit of small values of
|\mu_\rho|/m_SUSY.
The contributions of Higgs-mediated effects to the decay tau --> mu mu mu are
also discussed.
| [
{
"created": "Fri, 13 Apr 2012 07:27:01 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Jul 2012 05:47:51 GMT",
"version": "v2"
}
] | 2012-07-11 | [
[
"Giang",
"P. T.",
""
],
[
"Hue",
"L. T.",
""
],
[
"Huong",
"D. T.",
""
],
[
"Long",
"H. N.",
""
]
] | We investigate Lepton-Flavor Violating (LFV) decays of Higgs to muon-tau in the supersymmetric economical 3-3-1 (SUSYE331) model. In the presence of flavor mixing in sleptons {mu,tau} and large values of v/v', the ratio of Br(H -->tau^+mu^-)/Br(H -->tau^+tau^-) can reach to non-negligible values O(10^{-3}), as in many known SUSY models. We predict that for the Standard Model Higgs boson, the LHC may detect its decay to muon and tauon. We also investigate the asymmetry between left and right LFV values of corrections and prove that the LFV effects are dominated by the left FLV term, which is O(10^3) times larger than the right LFV term in the limit of small values of |\mu_\rho|/m_SUSY. The contributions of Higgs-mediated effects to the decay tau --> mu mu mu are also discussed. |
1805.00775 | Naoto Tanji | Naoto Tanji | Nonequilibrium axial charge production in expanding glasma flux tubes | 30 pages, 13 figures; version published in Phys. Rev. D | Phys. Rev. D 98, 014025 (2018) | 10.1103/PhysRevD.98.014025 | null | hep-ph hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Axial charge production at the early stage of heavy-ion collisions is
investigated within the framework of real-time lattice simulations at leading
order in QCD coupling. Starting from color glass condensate initial conditions,
the time evolution of quantum quark fields under classical color gauge fields
is computed on a lattice in longitudinally expanding geometry. We consider
simple color charge distributions in Lorentz contracted nuclei that realize
flux tube-like configurations of color fields carrying nonzero topological
charge after a collision. By employing the Wilson fermion extended to the
longitudinally expanding geometry, we demonstrate the realization of the axial
anomaly on the real-time lattice.
| [
{
"created": "Wed, 2 May 2018 13:01:20 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Jul 2018 10:26:31 GMT",
"version": "v2"
}
] | 2018-07-20 | [
[
"Tanji",
"Naoto",
""
]
] | Axial charge production at the early stage of heavy-ion collisions is investigated within the framework of real-time lattice simulations at leading order in QCD coupling. Starting from color glass condensate initial conditions, the time evolution of quantum quark fields under classical color gauge fields is computed on a lattice in longitudinally expanding geometry. We consider simple color charge distributions in Lorentz contracted nuclei that realize flux tube-like configurations of color fields carrying nonzero topological charge after a collision. By employing the Wilson fermion extended to the longitudinally expanding geometry, we demonstrate the realization of the axial anomaly on the real-time lattice. |
hep-ph/9501411 | Jacques Bloch | J. C. R. Bloch and M. R. Pennington | Numerical cancellation of photon quadratic divergence in the study of
the Schwinger-Dyson equations in Strong Coupling QED | 9 pages, Latex, 5 figures. Complete postscript file available from:
ftp://cpt1.dur.ac.uk/pub/preprints/dtp94/dtp94100/dtp94100.ps | Mod.Phys.Lett.A10:1225-1233,1995 | 10.1142/S0217732395001344 | DTP-94/100 | hep-ph hep-th | null | The behaviour of the photon renormalization function in strong coupling QED
has been recently studied by Kondo, Mino and Nakatani. We find that the sharp
decrease in its behaviour at intermediate photon momenta is an artefact of the
method used to remove the quadratic divergence in the vacuum polarization. We
discuss how this can be avoided in numerical studies of the Schwinger-Dyson
equations.
| [
{
"created": "Tue, 31 Jan 1995 12:45:19 GMT",
"version": "v1"
}
] | 2009-01-14 | [
[
"Bloch",
"J. C. R.",
""
],
[
"Pennington",
"M. R.",
""
]
] | The behaviour of the photon renormalization function in strong coupling QED has been recently studied by Kondo, Mino and Nakatani. We find that the sharp decrease in its behaviour at intermediate photon momenta is an artefact of the method used to remove the quadratic divergence in the vacuum polarization. We discuss how this can be avoided in numerical studies of the Schwinger-Dyson equations. |
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