id stringlengths 9 14 | submitter stringlengths 1 56 ⌀ | authors stringlengths 5 7.68k | title stringlengths 3 299 | comments stringlengths 1 1.15k ⌀ | journal-ref stringlengths 9 298 ⌀ | doi stringlengths 12 97 ⌀ | report-no stringlengths 3 341 ⌀ | categories stringclasses 869 values | license stringclasses 9 values | orig_abstract stringlengths 16 2.44k | versions listlengths 1 39 | update_date stringlengths 10 10 | authors_parsed listlengths 1 565 | abstract stringlengths 13 2.44k |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2007.02898 | Digesh Raut | Nobuchika Okada, Satomi Okada, Digesh Raut, and Qaisar Shafi | Dark Matter $Z^\prime$ and XENON1T Excess from $U(1)_X$ Extended
Standard Model | 6 pages, version published in PLB | null | 10.1016/j.physletb.2020.135785 | null | hep-ph astro-ph.HE hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A gauged $U(1)_X$ symmetry appended to the Standard Model (SM) is
particularly well-motivated since it can account for the light neutrino masses
by the seesaw mechanism, explain the origin of baryon asymmetry of the universe
via leptogenesis, and help implement successful cosmological inflation with the
$U(1)_X$ breaking Higgs field as the inflaton. In this framework, we propose a
light dark matter (DM) scenario in which the $U(1)_X$ gauge boson $Z^\prime$
behaves as a DM particle in the universe. We discuss how this scenario with
$Z^\prime$ mass of a few keV and a $U(1)_X$ gauge coupling $g_X \simeq
10^{-16}$ can nicely fit the excess in the electronic recoil energy spectrum
recently reported by the XENON1T collaboration. In order to reproduce the
observed DM relic density in the presence of such a tiny gauge coupling, we
propose an extension of the model to a two-component DM scenario. The
$Z^\prime$ DM density can be comparable to the observed DM density by the
freeze-in mechanism through the coupling of $Z^\prime$ boson to a partner
Higgs-portal scalar DM with a large $U(1)_X$ charge.
| [
{
"created": "Mon, 6 Jul 2020 17:22:00 GMT",
"version": "v1"
},
{
"created": "Sun, 7 Mar 2021 20:29:29 GMT",
"version": "v2"
}
] | 2021-03-09 | [
[
"Okada",
"Nobuchika",
""
],
[
"Okada",
"Satomi",
""
],
[
"Raut",
"Digesh",
""
],
[
"Shafi",
"Qaisar",
""
]
] | A gauged $U(1)_X$ symmetry appended to the Standard Model (SM) is particularly well-motivated since it can account for the light neutrino masses by the seesaw mechanism, explain the origin of baryon asymmetry of the universe via leptogenesis, and help implement successful cosmological inflation with the $U(1)_X$ breaking Higgs field as the inflaton. In this framework, we propose a light dark matter (DM) scenario in which the $U(1)_X$ gauge boson $Z^\prime$ behaves as a DM particle in the universe. We discuss how this scenario with $Z^\prime$ mass of a few keV and a $U(1)_X$ gauge coupling $g_X \simeq 10^{-16}$ can nicely fit the excess in the electronic recoil energy spectrum recently reported by the XENON1T collaboration. In order to reproduce the observed DM relic density in the presence of such a tiny gauge coupling, we propose an extension of the model to a two-component DM scenario. The $Z^\prime$ DM density can be comparable to the observed DM density by the freeze-in mechanism through the coupling of $Z^\prime$ boson to a partner Higgs-portal scalar DM with a large $U(1)_X$ charge. |
1506.06351 | Andrea Addazi AndAdd | Andrea Addazi | Direct generation of a Majorana mass for the Neutron from Exotic
Instantons | Version accepted by Physics Letter B | null | 10.1016/j.physletb.2016.04.018 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss a new mechanism in which non-perturbative quantum gravity effects
directly generate a Majorana mass for the neutron. In particular, in string
theory, exotic instantons can generate an effective six quark operator by
calculable mixed disk amplitudes. In a low string scale scenario, with
$M_{S}\simeq 10\div 10^{5}\, \rm TeV$, a neutron-antineutron oscillation can be
reached in the next generation of experiments. we argue that protons and
neutralinos are not destabilized and that dangerous FCNCs are not generated. We
show an example of quiver theories, locally free by tadpoles and anomalies,
reproducing MSSM plus a Majorana neutron and a Majorana neutrino. These models
naturally provide a viable baryogenesis mechanism by resonant RH neutrino
decays, as well as a stable WIMP-like dark matter. We also discuss how LHC data
will provide useful inputs for our model, in the immediate future, testing
several different regions of the parameter space. Such a mechanism represents a
simple and calculable counter-example to the Wilsonian UV completion of
effective non-renormalizable operators.
| [
{
"created": "Sun, 21 Jun 2015 11:35:17 GMT",
"version": "v1"
},
{
"created": "Mon, 31 Aug 2015 12:44:03 GMT",
"version": "v2"
},
{
"created": "Tue, 15 Dec 2015 09:51:49 GMT",
"version": "v3"
},
{
"created": "Wed, 6 Apr 2016 14:29:08 GMT",
"version": "v4"
}
] | 2016-05-04 | [
[
"Addazi",
"Andrea",
""
]
] | We discuss a new mechanism in which non-perturbative quantum gravity effects directly generate a Majorana mass for the neutron. In particular, in string theory, exotic instantons can generate an effective six quark operator by calculable mixed disk amplitudes. In a low string scale scenario, with $M_{S}\simeq 10\div 10^{5}\, \rm TeV$, a neutron-antineutron oscillation can be reached in the next generation of experiments. we argue that protons and neutralinos are not destabilized and that dangerous FCNCs are not generated. We show an example of quiver theories, locally free by tadpoles and anomalies, reproducing MSSM plus a Majorana neutron and a Majorana neutrino. These models naturally provide a viable baryogenesis mechanism by resonant RH neutrino decays, as well as a stable WIMP-like dark matter. We also discuss how LHC data will provide useful inputs for our model, in the immediate future, testing several different regions of the parameter space. Such a mechanism represents a simple and calculable counter-example to the Wilsonian UV completion of effective non-renormalizable operators. |
1203.5137 | Sergey Troshin | S. M. Troshin, N. E. Tyurin | On the large-$t$ elastic scattering at $\sqrt{s}=7$ TeV | 7 pages, 1 figure, enlarged version | Mod. Phys. Lett. A, Vol. 27, No. 20 (2012) 1250111 | 10.1142/S021773231250118 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss discrimination of the scattering mechanisms on the basis of
functional dependencies of the large-$t$ elastic scattering suggested by the
recent data from the TOTEM experiment. It is shown that Orear exponent is in a
better agreement with the data than the power-like dependence used by the
TOTEM. This implies that the collective dynamics is dominating over the
point-like mechanism related to the scattering of the proton constituents.
| [
{
"created": "Wed, 21 Mar 2012 12:37:20 GMT",
"version": "v1"
},
{
"created": "Sat, 12 May 2012 07:19:33 GMT",
"version": "v2"
}
] | 2012-06-15 | [
[
"Troshin",
"S. M.",
""
],
[
"Tyurin",
"N. E.",
""
]
] | We discuss discrimination of the scattering mechanisms on the basis of functional dependencies of the large-$t$ elastic scattering suggested by the recent data from the TOTEM experiment. It is shown that Orear exponent is in a better agreement with the data than the power-like dependence used by the TOTEM. This implies that the collective dynamics is dominating over the point-like mechanism related to the scattering of the proton constituents. |
hep-ph/0109240 | Jonathan L. Rosner | Jonathan L. Rosner | CP Symmetry Violation | 5 pages, LaTeX, no figures, to be published in {\it Macmillan
Encylopedia of Physics, Supplement: Elementary Particle Physics}, edited by
John S. Rigden, Jonathan Bagger, and Roger H. Stuewer (Macmillan Reference
USA, New York, 2002). Revised version | null | null | EFI-01-40 | hep-ph | null | An elementary description of CP violation for the non-specialist is
presented. This article, for publication in {\it Macmillan Encylopedia of
Physics, Supplement: Elementary Particle Physics}, is being submitted to the
Archive for comments by colleagues.
| [
{
"created": "Tue, 25 Sep 2001 20:09:26 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Oct 2001 20:21:54 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Rosner",
"Jonathan L.",
""
]
] | An elementary description of CP violation for the non-specialist is presented. This article, for publication in {\it Macmillan Encylopedia of Physics, Supplement: Elementary Particle Physics}, is being submitted to the Archive for comments by colleagues. |
1201.2949 | Howard Baer | Howard Baer, Vernon Barger, Andre Lessa, Warintorn Sreethawong and
Xerxes Tata | Wh plus missing-E_T signature from gaugino pair production at the LHC | 5 pages with 4 .eps figures | null | 10.1103/PhysRevD.85.055022 | UH-511-1186-12 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In SUSY models with heavy squarks and gaugino mass unification, the gaugino
pair production reaction pp-> \tw_1^\pm\tz_2 dominates gluino pair production
for m_{\tg}\agt 1 TeV at LHC with \sqrt{s}=14 TeV (LHC14). For this mass range,
the two-body decays \tw_1\to W\tz_1 and \tz_2\to h\tz_1 are expected to
dominate the chargino and neutralino branching fractions. By searching for \ell
b\bar{b}+MET events from \tw_1^\pm\tz_2 production, we show that LHC14 with 100
fb^{-1} of integrated luminosity becomes sensitive to chargino masses in the
range m_{\tw_1}\sim 450-550 GeV corresponding to m_{\tg}\sim 1.5-2 TeV in
models with gaugino mass unification. For 10^3 fb^{-1}, LHC14 is sensitive to
the Wh channel for m_{\tw_1}\sim 300-800 GeV, corresponding to m_{\tg}\sim
1-2.8 TeV, which is comparable to the reach for gluino pair production followed
by cascade decays. The Wh+MET search channel opens up a new complementary
avenue for SUSY searches at LHC, and serves to point to SUSY as the origin of
any new physics discovered via multijet and multilepton + MET channels.
| [
{
"created": "Fri, 13 Jan 2012 21:04:22 GMT",
"version": "v1"
}
] | 2013-05-30 | [
[
"Baer",
"Howard",
""
],
[
"Barger",
"Vernon",
""
],
[
"Lessa",
"Andre",
""
],
[
"Sreethawong",
"Warintorn",
""
],
[
"Tata",
"Xerxes",
""
]
] | In SUSY models with heavy squarks and gaugino mass unification, the gaugino pair production reaction pp-> \tw_1^\pm\tz_2 dominates gluino pair production for m_{\tg}\agt 1 TeV at LHC with \sqrt{s}=14 TeV (LHC14). For this mass range, the two-body decays \tw_1\to W\tz_1 and \tz_2\to h\tz_1 are expected to dominate the chargino and neutralino branching fractions. By searching for \ell b\bar{b}+MET events from \tw_1^\pm\tz_2 production, we show that LHC14 with 100 fb^{-1} of integrated luminosity becomes sensitive to chargino masses in the range m_{\tw_1}\sim 450-550 GeV corresponding to m_{\tg}\sim 1.5-2 TeV in models with gaugino mass unification. For 10^3 fb^{-1}, LHC14 is sensitive to the Wh channel for m_{\tw_1}\sim 300-800 GeV, corresponding to m_{\tg}\sim 1-2.8 TeV, which is comparable to the reach for gluino pair production followed by cascade decays. The Wh+MET search channel opens up a new complementary avenue for SUSY searches at LHC, and serves to point to SUSY as the origin of any new physics discovered via multijet and multilepton + MET channels. |
1612.08206 | Mohamed Abu-Shady | E. M. Khokha, M. Abu-Shady, and T. A. Abdel-Karim | Quarkonium Masses in the N-dimensional Space Using the Analytical Exact
Iteration Method | 7 pages, 3 figures, and 6 tables | International Journal of Theoretical and Applied Mathematics, V.
2, 86-92 (2016) | 10.11648/j.ijtam.20160202.19 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The N-dimensional radial Schrodinger equation with an extended Cornell
potential is solved. The analytical exact iteration method is applied. The
energy eigenvalues are calculated in the N-dimensional space. The charmonium
meson, the bottomonium meson and the bc meson masses are calculated in the
N-dimensional space. The special cases are obtained from the general case. The
study of the effect of dimensionality number is studied. The mean value of the
radius and the mean square velocity of charmonium meson, bottomonium meson, and
bc meson are calculated. The present results are improved in comparison with
other recent studies and are in good agreement with the experimental data.
Therefore, the present method with the present potential gives successfully
description of heavy quarkonium properties.
| [
{
"created": "Sat, 24 Dec 2016 17:10:31 GMT",
"version": "v1"
}
] | 2017-01-11 | [
[
"Khokha",
"E. M.",
""
],
[
"Abu-Shady",
"M.",
""
],
[
"Abdel-Karim",
"T. A.",
""
]
] | The N-dimensional radial Schrodinger equation with an extended Cornell potential is solved. The analytical exact iteration method is applied. The energy eigenvalues are calculated in the N-dimensional space. The charmonium meson, the bottomonium meson and the bc meson masses are calculated in the N-dimensional space. The special cases are obtained from the general case. The study of the effect of dimensionality number is studied. The mean value of the radius and the mean square velocity of charmonium meson, bottomonium meson, and bc meson are calculated. The present results are improved in comparison with other recent studies and are in good agreement with the experimental data. Therefore, the present method with the present potential gives successfully description of heavy quarkonium properties. |
0904.4485 | John Mason | John D. Mason | Gauge Mediation with a small mu term and light squarks | 34 pages, 8 figures. References and minor clarifications added. To
appear in PRD | Phys.Rev.D80:015026,2009 | 10.1103/PhysRevD.80.015026 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a solution to the mu problem in the context of Non-Minimal Gauge
Mediation with two Singlets and Low-Scale Messengers. This solution reduces
tuning associated with the "Little Hierarchy" problem by permitting a naturally
small mu term (100-300 GeV) due to small mixing between the Singlets. The
smallness of mu also relies crucially on compressing the Gauge Mediated
sparticle spectrum resulting in 330-400 GeV squarks. In addition to a small mu
term, the theory achieves a Higgs mass > 114.4 GeV through a large Higgs
quartic coupling when tanbeta ~ 1.5. The vacua studied are globally stable with
all couplings perturbative to the GUT scale. The amount of tuning required to
get the correct Electroweak scale is of order 10%, with a similar residual
tuning associated with the region of parameter space where the lightest CP-even
Higgs mass is above the LEP bound.
| [
{
"created": "Wed, 29 Apr 2009 16:47:10 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Jul 2009 15:50:05 GMT",
"version": "v2"
}
] | 2010-05-28 | [
[
"Mason",
"John D.",
""
]
] | We consider a solution to the mu problem in the context of Non-Minimal Gauge Mediation with two Singlets and Low-Scale Messengers. This solution reduces tuning associated with the "Little Hierarchy" problem by permitting a naturally small mu term (100-300 GeV) due to small mixing between the Singlets. The smallness of mu also relies crucially on compressing the Gauge Mediated sparticle spectrum resulting in 330-400 GeV squarks. In addition to a small mu term, the theory achieves a Higgs mass > 114.4 GeV through a large Higgs quartic coupling when tanbeta ~ 1.5. The vacua studied are globally stable with all couplings perturbative to the GUT scale. The amount of tuning required to get the correct Electroweak scale is of order 10%, with a similar residual tuning associated with the region of parameter space where the lightest CP-even Higgs mass is above the LEP bound. |
2302.13510 | Katsuya Hashino | Tomohiro Abe, Katsuya Hashino | Gravitational waves from first-order phase transition in an
electroweakly interacting vector dark matter model | 33 pages, 10 figures, 1 table, version accepted by PTEP | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss gravitational waves in an electroweakly interacting vector dark
matter model. In the model, the electroweak gauge symmetry is extended to
SU(2)$_0 \times$ SU(2)$_1 \times$SU(2)$_2 \times$ U(1)$_Y$ and spontaneously
broken into SU(2)$_L \times$ U(1)$_Y$ at TeV scale. The model has an exchange
symmetry between SU(2)$_0$ and SU(2)$_2$. This symmetry stabilizes some massive
vector bosons associated with the spontaneous symmetry breaking described
above, and an electrically neutral one is a dark matter candidate. In the
previous study, it was found that the gauge couplings of SU(2)$_0$ and
SU(2)$_1$ are relatively large to explain the measured value of the dark matter
energy density via the freeze-out mechanism. With the large gauge couplings,
the gauge bosons potentially have a sizable effect on the scalar potential. In
this paper, we focus on the phase transition of SU(2)$_0 \times$ SU(2)$_1
\times$ SU(2)$_2 \to$ SU(2)$_L$. We calculate the effective potential at finite
temperature and find that the phase transition is first-order and strong in a
wide range of the parameter space. The strong first-order phase transition
generates gravitational waves. We calculate the gravitational wave spectrum and
find that it is possible to detect the gravitational waves predicted in the
model by future space-based gravitational wave interferometers. We explore the
regions of the parameter space probed by the gravitational wave detection. We
find that the gravitational wave detection can probe the region where the mass
of $h'$, a CP-even scalar in the model, is a few TeV.
| [
{
"created": "Mon, 27 Feb 2023 04:19:15 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Dec 2023 07:44:13 GMT",
"version": "v2"
},
{
"created": "Thu, 13 Jun 2024 05:55:51 GMT",
"version": "v3"
}
] | 2024-06-14 | [
[
"Abe",
"Tomohiro",
""
],
[
"Hashino",
"Katsuya",
""
]
] | We discuss gravitational waves in an electroweakly interacting vector dark matter model. In the model, the electroweak gauge symmetry is extended to SU(2)$_0 \times$ SU(2)$_1 \times$SU(2)$_2 \times$ U(1)$_Y$ and spontaneously broken into SU(2)$_L \times$ U(1)$_Y$ at TeV scale. The model has an exchange symmetry between SU(2)$_0$ and SU(2)$_2$. This symmetry stabilizes some massive vector bosons associated with the spontaneous symmetry breaking described above, and an electrically neutral one is a dark matter candidate. In the previous study, it was found that the gauge couplings of SU(2)$_0$ and SU(2)$_1$ are relatively large to explain the measured value of the dark matter energy density via the freeze-out mechanism. With the large gauge couplings, the gauge bosons potentially have a sizable effect on the scalar potential. In this paper, we focus on the phase transition of SU(2)$_0 \times$ SU(2)$_1 \times$ SU(2)$_2 \to$ SU(2)$_L$. We calculate the effective potential at finite temperature and find that the phase transition is first-order and strong in a wide range of the parameter space. The strong first-order phase transition generates gravitational waves. We calculate the gravitational wave spectrum and find that it is possible to detect the gravitational waves predicted in the model by future space-based gravitational wave interferometers. We explore the regions of the parameter space probed by the gravitational wave detection. We find that the gravitational wave detection can probe the region where the mass of $h'$, a CP-even scalar in the model, is a few TeV. |
hep-ph/0302166 | Adriano Doff Sotta Gomes | A. Doff, A. A. Natale | The origin of the first and third generation fermion masses in a
technicolor scenario | 10 pages, 9 figures as eps files, Latex; Abridged version of the
previous preprint. Title changed. Results remain the same | Eur.Phys.J.C32:417-426,2003 | 10.1140/epjc/s2003-01395-9 | null | hep-ph | null | We argue that the masses of the first and third fermionic generations, which
are respectively of the order of a few MeV up to a hundred GeV, are originated
in a dynamical symmetry breaking mechanism leading to masses of the order
$\alpha \mu$, where $\alpha$ is a small coupling constant and $\mu$, in the
case of the first fermionic generation, is the scale of the dynamical quark
mass ($\approx 250$ MeV). For the third fermion generation $\mu$ is the value
of the dynamical techniquark mass ($\approx 250$ GeV). We discuss how this
possibility can be implemented in a technicolor scenario, and how the mass of
the intermediate generation is generated.
| [
{
"created": "Wed, 19 Feb 2003 02:44:56 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Feb 2003 20:15:18 GMT",
"version": "v2"
},
{
"created": "Wed, 23 Jul 2003 19:43:19 GMT",
"version": "v3"
},
{
"created": "Thu, 22 Jan 2004 20:46:22 GMT",
"version": "v4"
}
] | 2011-09-13 | [
[
"Doff",
"A.",
""
],
[
"Natale",
"A. A.",
""
]
] | We argue that the masses of the first and third fermionic generations, which are respectively of the order of a few MeV up to a hundred GeV, are originated in a dynamical symmetry breaking mechanism leading to masses of the order $\alpha \mu$, where $\alpha$ is a small coupling constant and $\mu$, in the case of the first fermionic generation, is the scale of the dynamical quark mass ($\approx 250$ MeV). For the third fermion generation $\mu$ is the value of the dynamical techniquark mass ($\approx 250$ GeV). We discuss how this possibility can be implemented in a technicolor scenario, and how the mass of the intermediate generation is generated. |
2109.13321 | Pracheta Singha | Chowdhury Aminul Islam, Munshi G. Mustafa, Rajarshi Ray, Pracheta
Singha | Consistent approach to study gluon quasi-particles | 8 pages, 9 captioned figures, matches with the published version | Phys. Rev. D 106, 054002 (2022) | 10.1103/PhysRevD.106.054002 | null | hep-ph hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss a novel approach to estimate the partition function in effective
model frameworks when the effective potentials have multiple extrema, so that
ascertaining a mean field becomes difficult. Using this approach we present a
consistent model to study the thermodynamic properties of gluon quasi-particles
as a function of temperature, both in the color confined and the color
deconfined phases.
| [
{
"created": "Mon, 27 Sep 2021 19:47:31 GMT",
"version": "v1"
},
{
"created": "Sun, 12 Mar 2023 19:12:29 GMT",
"version": "v2"
}
] | 2023-03-14 | [
[
"Islam",
"Chowdhury Aminul",
""
],
[
"Mustafa",
"Munshi G.",
""
],
[
"Ray",
"Rajarshi",
""
],
[
"Singha",
"Pracheta",
""
]
] | We discuss a novel approach to estimate the partition function in effective model frameworks when the effective potentials have multiple extrema, so that ascertaining a mean field becomes difficult. Using this approach we present a consistent model to study the thermodynamic properties of gluon quasi-particles as a function of temperature, both in the color confined and the color deconfined phases. |
hep-ph/0011160 | Gary Felder | Gary Felder & Lev Kofman | The Development of Equilibrium After Preheating | 15 pages, 23 figures | Phys.Rev. D63 (2001) 103503 | 10.1103/PhysRevD.63.103503 | null | hep-ph astro-ph gr-qc hep-lat hep-th nlin.CD | null | We present a fully nonlinear study of the development of equilibrium after
preheating. Preheating is the exponentially rapid transfer of energy from the
nearly homogeneous inflaton field to fluctuations of other fields and/or the
inflaton itself. This rapid transfer leaves these fields in a highly nonthermal
state with energy concentrated in infrared modes. We have performed lattice
simulations of the evolution of interacting scalar fields during and after
preheating for a variety of inflationary models. We have formulated a set of
generic rules that govern the thermalization process in all of these models.
Notably, we see that once one of the fields is amplified through parametric
resonance or other mechanisms it rapidly excites other coupled fields to
exponentially large occupation numbers. These fields quickly acquire nearly
thermal spectra in the infrared, which gradually propagates into higher
momenta. Prior to the formation of total equilibrium, the excited fields group
into subsets with almost identical characteristics (e.g. group effective
temperature). The way fields form into these groups and the properties of the
groups depend on the couplings between them. We also studied the onset of chaos
after preheating by calculating the Lyapunov exponent of the scalar fields.
| [
{
"created": "Mon, 13 Nov 2000 02:51:25 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Feb 2001 21:55:11 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Felder",
"Gary",
""
],
[
"Kofman",
"Lev",
""
]
] | We present a fully nonlinear study of the development of equilibrium after preheating. Preheating is the exponentially rapid transfer of energy from the nearly homogeneous inflaton field to fluctuations of other fields and/or the inflaton itself. This rapid transfer leaves these fields in a highly nonthermal state with energy concentrated in infrared modes. We have performed lattice simulations of the evolution of interacting scalar fields during and after preheating for a variety of inflationary models. We have formulated a set of generic rules that govern the thermalization process in all of these models. Notably, we see that once one of the fields is amplified through parametric resonance or other mechanisms it rapidly excites other coupled fields to exponentially large occupation numbers. These fields quickly acquire nearly thermal spectra in the infrared, which gradually propagates into higher momenta. Prior to the formation of total equilibrium, the excited fields group into subsets with almost identical characteristics (e.g. group effective temperature). The way fields form into these groups and the properties of the groups depend on the couplings between them. We also studied the onset of chaos after preheating by calculating the Lyapunov exponent of the scalar fields. |
1206.4921 | Kanako Yamazaki | Kanako Yamazaki and Tetsuo Matsui | Equation of state of a meson gas from the PNJL model for interacting
quarks | 6 pages, 3 figures. arXiv admin note: substantial text overlap with
arXiv:1212.6165 | null | null | UT-Komaba/12-3 | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the equation of state of hadronic matter at finite temperature
with zero net baryon density by the Nambu-Jona-Lasinio model for interacting
quarks in uniform background temporal color gauge fields. In the low
temperature confining phase, unphysical thermal quark-antiquark excitations
which would appear in the mean field approximation, are eliminated by enforcing
vanishing expectation value of the "Polyakov-loop" of the background gauge
field, while in the high temperature confining phase this expectation value is
taken as close to unity allowing thermal excitations of free quarks and
antiquarks. Mesonic excitations in the low temperature phase appear in the
correlation energy as contributions of collective excitations. We describe them
in terms of thermal fluctuations of auxiliary fields in one-loop (Gaussian)
approximation, where pions appear as Nambu-Goldstone modes associated with
dynamical symmetry breaking of the chiral symmetry in the limit of vanishing
bare quark masses. We show that the equations of state reduces to that of free
meson gas with numerically small corrections arising from the composite nature
of mesons.
| [
{
"created": "Thu, 21 Jun 2012 16:02:17 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Jan 2013 09:17:10 GMT",
"version": "v2"
}
] | 2013-01-21 | [
[
"Yamazaki",
"Kanako",
""
],
[
"Matsui",
"Tetsuo",
""
]
] | We compute the equation of state of hadronic matter at finite temperature with zero net baryon density by the Nambu-Jona-Lasinio model for interacting quarks in uniform background temporal color gauge fields. In the low temperature confining phase, unphysical thermal quark-antiquark excitations which would appear in the mean field approximation, are eliminated by enforcing vanishing expectation value of the "Polyakov-loop" of the background gauge field, while in the high temperature confining phase this expectation value is taken as close to unity allowing thermal excitations of free quarks and antiquarks. Mesonic excitations in the low temperature phase appear in the correlation energy as contributions of collective excitations. We describe them in terms of thermal fluctuations of auxiliary fields in one-loop (Gaussian) approximation, where pions appear as Nambu-Goldstone modes associated with dynamical symmetry breaking of the chiral symmetry in the limit of vanishing bare quark masses. We show that the equations of state reduces to that of free meson gas with numerically small corrections arising from the composite nature of mesons. |
1505.00177 | Sudipa Upadhaya | Kinkar Saha, Sudipa Upadhaya and Sabyasachi Ghosh | A comparative study on two different expressions of Bulk viscosity in
the PNJL model | 13 pages, 4 figures | null | 10.1142/S0217732317500183 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have gone through a comparative study on two different kind of bulk
viscosity expressions by using a common dynamical model. The
Polyakov-Nambu-Jona-Lasinio (PNJL) model in the realm of mean-field
approximation, including up to eight quark interactions for 2+1 flavor quark
matter, is treated for this common dynamics. We have probed the numerical
equivalence as well as discrepancy of two different expressions for bulk
viscosity at vanishing quark chemical potential. Our estimation of bulk
viscosity to entropy density ratio follows a decreasing trend with temperature,
which is observed in most of the earlier investigations. We have also extended
our estimation for finite values of quark chemical potential.
| [
{
"created": "Fri, 1 May 2015 13:40:20 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Nov 2016 09:34:28 GMT",
"version": "v2"
}
] | 2017-01-10 | [
[
"Saha",
"Kinkar",
""
],
[
"Upadhaya",
"Sudipa",
""
],
[
"Ghosh",
"Sabyasachi",
""
]
] | We have gone through a comparative study on two different kind of bulk viscosity expressions by using a common dynamical model. The Polyakov-Nambu-Jona-Lasinio (PNJL) model in the realm of mean-field approximation, including up to eight quark interactions for 2+1 flavor quark matter, is treated for this common dynamics. We have probed the numerical equivalence as well as discrepancy of two different expressions for bulk viscosity at vanishing quark chemical potential. Our estimation of bulk viscosity to entropy density ratio follows a decreasing trend with temperature, which is observed in most of the earlier investigations. We have also extended our estimation for finite values of quark chemical potential. |
1310.2793 | Subhasis Samanta | Abhijit Bhattacharyya, Supriya Das, Sanjay K. Ghosh, Rajarshi Ray and
Subhasis Samanta | Fluctuations and correlations of conserved charges in an excluded volume
hadron resonance gas model | 15 pages, 13 figures | Phys. Rev. C 90, 034909 (2014) | 10.1103/PhysRevC.90.034909 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present temperature ($T$) and baryonic chemical potential ($\mu_B$)
dependence of higher order fluctuations and correlation between conserved
charges in Excluded Volume Hadron Resonance Gas (EVHRG) model. Products of
moments, such as ratio of variance to mean ($\sigma^2/M)$, product of skewness
and standard deviation ($S\sigma$), product of kurtosis and variance
($\kappa\sigma^2$), for net-proton, net-kaon and net-charge have been evaluated
on the phenomenologically determined freeze-out curve. Further, products of
moments for net-proton and net-charge have been compared with the experimental
data measured by STAR experiment. The dependence of the model result on the
hadronic radius parameter has also been discussed.
| [
{
"created": "Thu, 10 Oct 2013 12:43:25 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Sep 2014 17:12:40 GMT",
"version": "v2"
}
] | 2015-06-17 | [
[
"Bhattacharyya",
"Abhijit",
""
],
[
"Das",
"Supriya",
""
],
[
"Ghosh",
"Sanjay K.",
""
],
[
"Ray",
"Rajarshi",
""
],
[
"Samanta",
"Subhasis",
""
]
] | We present temperature ($T$) and baryonic chemical potential ($\mu_B$) dependence of higher order fluctuations and correlation between conserved charges in Excluded Volume Hadron Resonance Gas (EVHRG) model. Products of moments, such as ratio of variance to mean ($\sigma^2/M)$, product of skewness and standard deviation ($S\sigma$), product of kurtosis and variance ($\kappa\sigma^2$), for net-proton, net-kaon and net-charge have been evaluated on the phenomenologically determined freeze-out curve. Further, products of moments for net-proton and net-charge have been compared with the experimental data measured by STAR experiment. The dependence of the model result on the hadronic radius parameter has also been discussed. |
hep-ph/0109019 | Vittorio Del Duca | J.R. Andersen, V. Del Duca, S. Frixione, F. Maltoni, C.R. Schmidt and
W.J. Stirling | Forward jets and forward $W$-boson production at hadron colliders | LaTeX, JHEP style, 10 pages, 3 figures. Based on a talk at EPS2001,
Budapest, Hungary | null | null | null | hep-ph | null | In this talk we give a short review of forward jets and forward $W$-boson
production at hadron colliders, in view of the extraction of footprints of BFKL
physics. We argue that at Tevatron energies, dijet production at large rapidity
intervals is still subasymptotic with respect to the BFKL regime, thus the
cross section is strongly dependent on the various cuts applied in the
experimental setup. In addition, the choice of equal transverse momentum cuts
on the tagging jets makes the cross section dependent on large logarithms of
non-BFKL origin, and thus may spoil the BFKL analysis. For vector boson
production in association with two jets, we argue that the configurations that
are kinematically favoured tend to have the vector boson forward in rapidity.
Thus $W + 2$ jet production lends itself naturally to extensions to the
high-energy limit.
| [
{
"created": "Mon, 3 Sep 2001 13:50:26 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Andersen",
"J. R.",
""
],
[
"Del Duca",
"V.",
""
],
[
"Frixione",
"S.",
""
],
[
"Maltoni",
"F.",
""
],
[
"Schmidt",
"C. R.",
""
],
[
"Stirling",
"W. J.",
""
]
] | In this talk we give a short review of forward jets and forward $W$-boson production at hadron colliders, in view of the extraction of footprints of BFKL physics. We argue that at Tevatron energies, dijet production at large rapidity intervals is still subasymptotic with respect to the BFKL regime, thus the cross section is strongly dependent on the various cuts applied in the experimental setup. In addition, the choice of equal transverse momentum cuts on the tagging jets makes the cross section dependent on large logarithms of non-BFKL origin, and thus may spoil the BFKL analysis. For vector boson production in association with two jets, we argue that the configurations that are kinematically favoured tend to have the vector boson forward in rapidity. Thus $W + 2$ jet production lends itself naturally to extensions to the high-energy limit. |
1111.5292 | Ricardo Torres Andres | R. Torres Andres, A. Gomez Nicola | Scalar susceptibilities and Electromagnetic thermal mass differences in
Chiral Perturbation Theory | Proceedings of the "International School of Nuclear Physics", Erice,
Italy, September 16th-September 24th 2011. 7 pages, 5 figures. To be
published in Prog. Part. Nucl. Phys | null | 10.1016/j.ppnp.2011.12.040 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We make a thermal analysis of the light scalar susceptibilities using
SU(3)-Chiral Perturbation Theory to one loop taking into account the QCD source
of isospin breaking (IB), i.e corrections coming from $m_u\neq m_d$. The value
of the connected scalar susceptibility in the infrared regime, the one relevant
when approaching chiral symmetry restoration, and below the critical
temperature is found to be entirely dominated by the $\pi^0-\eta$ mixing, which
leads to model-independent $\mathcal{O}(\epsilon^0)$ corrections, where
$\epsilon\sim m_d-m_u$, in the combination $\chi_{uu}-\chi_{ud}$ of flavour
breaking susceptibilities. We also present preliminary results for the
corrections to the real part of the pion self-energy at nexst-to-leading order
in SU(2)-Chiral Perturbation Theory taking into account electromagnetic
interaction. The zero and finite temperature results for the charged and
neutral pions are given in terms of the three-momentum of the external pion;
and their difference is calculated to this order stressing the fact that, at
low and moderate temperature, the mass splitting $M_{\pi^\pm}-M_{\pi^0}$ grows
with temperature for, at least, non-zero charged pion mass running inside the
loops.
| [
{
"created": "Tue, 22 Nov 2011 19:24:29 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Nov 2011 11:02:18 GMT",
"version": "v2"
}
] | 2015-06-03 | [
[
"Andres",
"R. Torres",
""
],
[
"Nicola",
"A. Gomez",
""
]
] | We make a thermal analysis of the light scalar susceptibilities using SU(3)-Chiral Perturbation Theory to one loop taking into account the QCD source of isospin breaking (IB), i.e corrections coming from $m_u\neq m_d$. The value of the connected scalar susceptibility in the infrared regime, the one relevant when approaching chiral symmetry restoration, and below the critical temperature is found to be entirely dominated by the $\pi^0-\eta$ mixing, which leads to model-independent $\mathcal{O}(\epsilon^0)$ corrections, where $\epsilon\sim m_d-m_u$, in the combination $\chi_{uu}-\chi_{ud}$ of flavour breaking susceptibilities. We also present preliminary results for the corrections to the real part of the pion self-energy at nexst-to-leading order in SU(2)-Chiral Perturbation Theory taking into account electromagnetic interaction. The zero and finite temperature results for the charged and neutral pions are given in terms of the three-momentum of the external pion; and their difference is calculated to this order stressing the fact that, at low and moderate temperature, the mass splitting $M_{\pi^\pm}-M_{\pi^0}$ grows with temperature for, at least, non-zero charged pion mass running inside the loops. |
1807.10606 | Alexei Prokudin | S. Bastami, H. Avakian, A. V. Efremov, A. Kotzinian, B. U. Musch, B.
Parsamyan, A. Prokudin, M. Schlegel, G. Schnell, P. Schweitzer, K. Tezgin | Semi-Inclusive Deep Inelastic Scattering in Wandzura-Wilczek-type
approximation | Published in JHEP, 71 pages, 21 figures, references updated,
discussion improved | JHEP 06 (2019) 007 | 10.1007/JHEP06(2019)007 | JLAB-THY-18-2775 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the complete cross-section for the production of unpolarized
hadrons in semi-inclusive deep-inelastic scattering up to power-suppressed
${\cal O}(1/Q^2)$ terms in the Wandzura--Wilczek-type approximation which
consists in systematically assuming that $\bar{q}gq$--terms are much smaller
than $\bar{q}q$--correlators. We compute all twist-2 and twist-3 structure
functions and the corresponding asymmetries, and discuss the applicability of
the Wandzura--Wilczek-type approximations on the basis of available data. We
make predictions that can be tested by data from Jefferson Lab, COMPASS,
HERMES, and the future Electron-Ion Collider. The results of this paper can be
readily used for phenomenology and for event generators, and will help to
improve our understanding of the TMD theory beyond leading twist.
| [
{
"created": "Fri, 27 Jul 2018 13:24:30 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Jan 2019 18:35:31 GMT",
"version": "v2"
},
{
"created": "Mon, 10 Jun 2019 15:46:16 GMT",
"version": "v3"
}
] | 2019-06-18 | [
[
"Bastami",
"S.",
""
],
[
"Avakian",
"H.",
""
],
[
"Efremov",
"A. V.",
""
],
[
"Kotzinian",
"A.",
""
],
[
"Musch",
"B. U.",
""
],
[
"Parsamyan",
"B.",
""
],
[
"Prokudin",
"A.",
""
],
[
"Schlegel",
"M.",
""
],
[
"Schnell",
"G.",
""
],
[
"Schweitzer",
"P.",
""
],
[
"Tezgin",
"K.",
""
]
] | We present the complete cross-section for the production of unpolarized hadrons in semi-inclusive deep-inelastic scattering up to power-suppressed ${\cal O}(1/Q^2)$ terms in the Wandzura--Wilczek-type approximation which consists in systematically assuming that $\bar{q}gq$--terms are much smaller than $\bar{q}q$--correlators. We compute all twist-2 and twist-3 structure functions and the corresponding asymmetries, and discuss the applicability of the Wandzura--Wilczek-type approximations on the basis of available data. We make predictions that can be tested by data from Jefferson Lab, COMPASS, HERMES, and the future Electron-Ion Collider. The results of this paper can be readily used for phenomenology and for event generators, and will help to improve our understanding of the TMD theory beyond leading twist. |
hep-ph/0603107 | Pasquale Di Bari | Steve Blanchet and Pasquale Di Bari | Leptogenesis beyond the limit of hierarchical heavy neutrino masses | 30 pages, 8 figures; corrected typo in Eq. (67); shortened
Introduction, Section 3 and Conclusions; one figure removed; added 2
references; to appear in JCAP | JCAP 0606:023,2006 | 10.1088/1475-7516/2006/06/023 | MPP-2006-20 | hep-ph | null | We calculate the baryon asymmetry of the Universe in thermal leptogenesis
beyond the usual lightest right-handed (RH) neutrino dominated scenario (N_1DS)
and in particular beyond the hierarchical limit (HL), M_1 << M_2 << M_3, for
the RH neutrino mass spectrum. After providing some orientation among the large
variety of models, we first revisit the central role of the N_1DS, with new
insights on the dynamics of the asymmetry generation and then discuss the main
routes departing from it, focusing on models beyond the HL. We study in detail
two examples of `strong-strong' wash-out scenarios: one with `maximal phase'
and the limit of very large M_3, studying the effects arising when
delta_2=(M_2-M_1)/M_1 is small. We extend analytical methods already applied to
the N_1DS showing, for example, that, in the degenerate limit (DL), the
efficiency factors of the RH neutrinos become equal with the single decay
parameter replaced by the sum. Both cases disprove the misconception that close
RH neutrino masses necessarily lead to a final asymmetry enhancement and to a
relaxation of the lower bounds on M_1 and on the initial temperature of the
radiation-dominated expansion. We also explain why leptogenesis tends to favor
normal hierarchy compared to inverted hierarchy for the left-handed neutrino
masses.
| [
{
"created": "Wed, 15 Mar 2006 18:57:26 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Jun 2006 10:07:34 GMT",
"version": "v2"
}
] | 2011-07-19 | [
[
"Blanchet",
"Steve",
""
],
[
"Di Bari",
"Pasquale",
""
]
] | We calculate the baryon asymmetry of the Universe in thermal leptogenesis beyond the usual lightest right-handed (RH) neutrino dominated scenario (N_1DS) and in particular beyond the hierarchical limit (HL), M_1 << M_2 << M_3, for the RH neutrino mass spectrum. After providing some orientation among the large variety of models, we first revisit the central role of the N_1DS, with new insights on the dynamics of the asymmetry generation and then discuss the main routes departing from it, focusing on models beyond the HL. We study in detail two examples of `strong-strong' wash-out scenarios: one with `maximal phase' and the limit of very large M_3, studying the effects arising when delta_2=(M_2-M_1)/M_1 is small. We extend analytical methods already applied to the N_1DS showing, for example, that, in the degenerate limit (DL), the efficiency factors of the RH neutrinos become equal with the single decay parameter replaced by the sum. Both cases disprove the misconception that close RH neutrino masses necessarily lead to a final asymmetry enhancement and to a relaxation of the lower bounds on M_1 and on the initial temperature of the radiation-dominated expansion. We also explain why leptogenesis tends to favor normal hierarchy compared to inverted hierarchy for the left-handed neutrino masses. |
1011.4905 | Peihong Gu | Pei-Hong Gu, Manfred Lindner | Natural Inflation and Flavor Mixing from Peccei-Quinn Symmetry Breaking | 4 pages, 2 figures | Phys.Lett.B697:229-232,2011 | 10.1016/j.physletb.2011.02.005 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a left-right symmetric model to simultaneously give natural
inflation and flavor mixing from a Peccei-Quinn symmetry breaking at the Planck
scale. Our model can be embedded in SO(10) grand unification theories.
| [
{
"created": "Mon, 22 Nov 2010 18:45:52 GMT",
"version": "v1"
}
] | 2011-05-26 | [
[
"Gu",
"Pei-Hong",
""
],
[
"Lindner",
"Manfred",
""
]
] | We propose a left-right symmetric model to simultaneously give natural inflation and flavor mixing from a Peccei-Quinn symmetry breaking at the Planck scale. Our model can be embedded in SO(10) grand unification theories. |
2007.08300 | Ignacio Borsa Sanjuan | Elke C. Aschenauer, Ignacio Borsa, Gonzalo Lucero, Ana S. Nunes,
Rodolfo Sassot | Revisiting Helicity Parton Distributions at a Future Electron-Ion
Collider | 19 pages, 19 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We studied the impact of future Electron Ion Collider inclusive and
semi-inclusive polarized deep inelastic scattering data will have on the
determination of the helicity parton distributions. Supplementing the Monte
Carlo sampling variant of the DSSV14 analysis with pseudo-data on polarized
inclusive and semi-inclusive electron-proton deep inelastic scattering with
updated uncertainty estimates and for two different center-of-mass-system
energies, $\sqrt{s}=44.7$ GeV and $\sqrt{s}=141.4$ GeV respectively, and on
inclusive electron-helium collisions at $\sqrt{s}=115.2$ GeV, we find a
remarkable improvement in the determination of the helicity distributions,
specially at low parton momentum fraction $x$. While inclusive electron-proton
data at the lowest energy configuration constrain significantly the gluon
polarization down to $x \sim 10^{-4}$, the higher energy configuration
strengthens the constraint and extends it one decade further. On the other
hand, semi-inclusive data achieves the hitherto elusive flavor separation for
sea quarks that can not be obtained from any other inclusive electromagnetic
measurement. Collisions with helium complement inclusive proton measurements,
pushing the constraints on the combined quark plus anti-quark $u, d$ and $s$
polarizations to an unprecedented level.
| [
{
"created": "Thu, 16 Jul 2020 12:38:39 GMT",
"version": "v1"
}
] | 2020-07-17 | [
[
"Aschenauer",
"Elke C.",
""
],
[
"Borsa",
"Ignacio",
""
],
[
"Lucero",
"Gonzalo",
""
],
[
"Nunes",
"Ana S.",
""
],
[
"Sassot",
"Rodolfo",
""
]
] | We studied the impact of future Electron Ion Collider inclusive and semi-inclusive polarized deep inelastic scattering data will have on the determination of the helicity parton distributions. Supplementing the Monte Carlo sampling variant of the DSSV14 analysis with pseudo-data on polarized inclusive and semi-inclusive electron-proton deep inelastic scattering with updated uncertainty estimates and for two different center-of-mass-system energies, $\sqrt{s}=44.7$ GeV and $\sqrt{s}=141.4$ GeV respectively, and on inclusive electron-helium collisions at $\sqrt{s}=115.2$ GeV, we find a remarkable improvement in the determination of the helicity distributions, specially at low parton momentum fraction $x$. While inclusive electron-proton data at the lowest energy configuration constrain significantly the gluon polarization down to $x \sim 10^{-4}$, the higher energy configuration strengthens the constraint and extends it one decade further. On the other hand, semi-inclusive data achieves the hitherto elusive flavor separation for sea quarks that can not be obtained from any other inclusive electromagnetic measurement. Collisions with helium complement inclusive proton measurements, pushing the constraints on the combined quark plus anti-quark $u, d$ and $s$ polarizations to an unprecedented level. |
hep-ph/0306122 | Gilberto Colangelo | I. Caprini, G. Colangelo, J. Gasser and H. Leutwyler | On the precision of the theoretical predictions for pi pi scattering | Added more material, mostly in Sects. 7, 8 and 9, in support of the
same conclusions. Latex, 28 pages, 3 figures | Phys.Rev. D68 (2003) 074006 | 10.1103/PhysRevD.68.074006 | null | hep-ph | null | In a recent paper, Pelaez and Yndurain evaluate some of the low energy
observables of pi pi scattering and obtain flat disagreement with our earlier
results. The authors work with unsubtracted dispersion relations, so that their
results are very sensitive to the poorly known high energy behaviour of the
scattering amplitude. They claim that the asymptotic representation we used is
incorrect and propose an alternative one. We repeat their calculations on the
basis of the standard, subtracted fixed-t dispersion relations, using their
asymptotics. The outcome fully confirms our earlier findings. Moreover, we show
that the Regge parametrization proposed by these authors for the region above
1.4 GeV violates crossing symmetry: Their ansatz is not consistent with the
behaviour observed at low energies.
| [
{
"created": "Fri, 13 Jun 2003 14:16:53 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Aug 2003 16:46:51 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Caprini",
"I.",
""
],
[
"Colangelo",
"G.",
""
],
[
"Gasser",
"J.",
""
],
[
"Leutwyler",
"H.",
""
]
] | In a recent paper, Pelaez and Yndurain evaluate some of the low energy observables of pi pi scattering and obtain flat disagreement with our earlier results. The authors work with unsubtracted dispersion relations, so that their results are very sensitive to the poorly known high energy behaviour of the scattering amplitude. They claim that the asymptotic representation we used is incorrect and propose an alternative one. We repeat their calculations on the basis of the standard, subtracted fixed-t dispersion relations, using their asymptotics. The outcome fully confirms our earlier findings. Moreover, we show that the Regge parametrization proposed by these authors for the region above 1.4 GeV violates crossing symmetry: Their ansatz is not consistent with the behaviour observed at low energies. |
hep-ph/0204034 | Kari J. Eskola | K.J. Eskola, K. Kajantie, P.V. Ruuskanen, K. Tuominen | Rapidity dependence of particle production in ultrarelativistic nuclear
collisions | 12 pages, 8 eps-figures | Phys.Lett.B543:208-216,2002 | 10.1016/S0370-2693(02)02457-7 | HIP-2002-10/TH, NORDITA-2002-20-HE | hep-ph nucl-th | null | We compute the rapidity dependence of particle and transverse energy
production in ultrarelativistic heavy ion collisions at various beam energies
and atomic numbers using the perturbative QCD + saturation model. The
distribution is a broad gaussian near $y=0$ but the rapid increase of particle
production with the beam energy will via energy conservation strongly constrain
the rapidity distribution at large $y$.
| [
{
"created": "Wed, 3 Apr 2002 10:23:26 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Eskola",
"K. J.",
""
],
[
"Kajantie",
"K.",
""
],
[
"Ruuskanen",
"P. V.",
""
],
[
"Tuominen",
"K.",
""
]
] | We compute the rapidity dependence of particle and transverse energy production in ultrarelativistic heavy ion collisions at various beam energies and atomic numbers using the perturbative QCD + saturation model. The distribution is a broad gaussian near $y=0$ but the rapid increase of particle production with the beam energy will via energy conservation strongly constrain the rapidity distribution at large $y$. |
2002.06411 | Yayun He | Y. He (1), S. Cao (2), W. Chen (1), T. Luo (1), L.-G. Pang (3 and 4)
and X.-N. Wang (1, 3 and 4) ((1) Central China Normal University, (2) Wayne
State University, (3) University of California, Berkeley, (4) Lawrence
Berkeley National Laboratory) | Interplaying mechanisms behind inclusive jet $R_{AA}$ and extraction of
jet energy loss distributions | 4 pages, 3 figures, contribution to the proceedings of XXVIIIth
International Conference on Ultrarelativistic Nucleus-Nucleus Collisions
(Quark Matter 2019) | null | 10.1016/j.nuclphysa.2020.122032 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The observed inclusive jet suppression in heavy-ion collisions at LHC has a
very weak $p_{T}$ dependence over a large range of $p_{T}$ = 50-1000 GeV and is
almost independent of the colliding energy, though the initial energy density
of the bulk medium has increased from $\sqrt{s}$ = 2.76 to 5.02 TeV by about
20%. This interesting phenomenon is investigated in the linear Boltzmann
transport (LBT) model for jet propagation in an event-by-event 3+1D hydro
background. We show that the $p_{T}$ dependence of jet $R_{AA}$ is determined
by the initial spectrum in $p+p$ collisions and $ p_{T} $ dependence of jet
energy loss. Furthermore, jet energy loss distributions for inclusive jet and $
\gamma-$jet at both LHC energies are extracted directly from experimental data
through the state-of-art Bayesian analysis. The averaged jet energy loss has a
weak $p_{T}$ dependence and the scaled jet energy loss distributions have a
large width, both of which are consistent with the LBT simulations and indicate
that jet quenching is caused by only a few out-of-cone jet medium scatterings.
| [
{
"created": "Sat, 15 Feb 2020 16:49:11 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Aug 2020 09:24:58 GMT",
"version": "v2"
}
] | 2021-02-03 | [
[
"He",
"Y.",
"",
"3 and 4"
],
[
"Cao",
"S.",
"",
"3 and 4"
],
[
"Chen",
"W.",
"",
"3 and 4"
],
[
"Luo",
"T.",
"",
"3 and 4"
],
[
"Pang",
"L. -G.",
"",
"3 and 4"
],
[
"Wang",
"X. -N.",
"",
"1, 3 and 4"
]
] | The observed inclusive jet suppression in heavy-ion collisions at LHC has a very weak $p_{T}$ dependence over a large range of $p_{T}$ = 50-1000 GeV and is almost independent of the colliding energy, though the initial energy density of the bulk medium has increased from $\sqrt{s}$ = 2.76 to 5.02 TeV by about 20%. This interesting phenomenon is investigated in the linear Boltzmann transport (LBT) model for jet propagation in an event-by-event 3+1D hydro background. We show that the $p_{T}$ dependence of jet $R_{AA}$ is determined by the initial spectrum in $p+p$ collisions and $ p_{T} $ dependence of jet energy loss. Furthermore, jet energy loss distributions for inclusive jet and $ \gamma-$jet at both LHC energies are extracted directly from experimental data through the state-of-art Bayesian analysis. The averaged jet energy loss has a weak $p_{T}$ dependence and the scaled jet energy loss distributions have a large width, both of which are consistent with the LBT simulations and indicate that jet quenching is caused by only a few out-of-cone jet medium scatterings. |
0710.2817 | Thomas Schutzmeier | Thomas Schutzmeier | Progress in the evaluation of the anti-B -> X_s gamma decay rate at NNLO | Presented at the XXXI International Conference of Theoretical Physics
"Matter To The Deepest: Recent Developments In Physics of Fundamental
Interactions", Ustron, 5-11 September 2007, Poland; 5 pages | Acta Phys.Polon.B38:3537-3542,2007 | null | null | hep-ph | null | The theoretical status of NNLO QCD corrections to the inclusive radiative
anti-B -> X_s gamma decay in the standard model is briefly overviewed. Emphasis
is put on recent results for three-loop fermionic corrections to matrix
elements of the most relevant four-quark operators.
| [
{
"created": "Mon, 15 Oct 2007 13:47:36 GMT",
"version": "v1"
}
] | 2008-12-30 | [
[
"Schutzmeier",
"Thomas",
""
]
] | The theoretical status of NNLO QCD corrections to the inclusive radiative anti-B -> X_s gamma decay in the standard model is briefly overviewed. Emphasis is put on recent results for three-loop fermionic corrections to matrix elements of the most relevant four-quark operators. |
2003.05450 | Xing Wang | Anadi Canepa, Tao Han, Xing Wang | The Search for Electroweakinos | 33 pages, 13 figures. Invited review prepared for publication in the
Annual Review of Nuclear and Particle Science, Volume 70 (2020) | null | 10.1146/annurev-nucl-031020-121031 | FERMILAB-PUB-16-565-T; PITT-PACC-2001 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this review, we consider a general theoretical framework for fermionic
color-singlet states, including a singlet, a doublet and a triplet under the
standard model SU(2)$_{\rm L}$ gauge symmetry, corresponding to the Bino,
Higgsino and Wino in Supersymmetric theories, generically dubbed as
"electroweakinos" for their mass eigenstates. Depending on the relations among
their three mass parameters and the mixings after the electroweak symmetry
breaking, this sector leads to rich phenomenology potentially accessible at the
current and near-future experiments. We discuss the decay patterns of the
electroweakinos and their observable signatures at colliders. We review the
existing bounds on the model parameters. We summarize the current status for
the comprehensive searches from the ATLAS and CMS experiments at the LHC. We
comment on the prospects for future colliders. An important feature of the
theory is that the lightest neutral electroweakino can be identified as a WIMP
cold dark matter candidate. We take into account the existing bounds on the
parameters from the dark matter direct detection experiments and discuss the
complementarity for the electroweakino searches at colliders.
| [
{
"created": "Wed, 11 Mar 2020 18:00:00 GMT",
"version": "v1"
}
] | 2020-03-13 | [
[
"Canepa",
"Anadi",
""
],
[
"Han",
"Tao",
""
],
[
"Wang",
"Xing",
""
]
] | In this review, we consider a general theoretical framework for fermionic color-singlet states, including a singlet, a doublet and a triplet under the standard model SU(2)$_{\rm L}$ gauge symmetry, corresponding to the Bino, Higgsino and Wino in Supersymmetric theories, generically dubbed as "electroweakinos" for their mass eigenstates. Depending on the relations among their three mass parameters and the mixings after the electroweak symmetry breaking, this sector leads to rich phenomenology potentially accessible at the current and near-future experiments. We discuss the decay patterns of the electroweakinos and their observable signatures at colliders. We review the existing bounds on the model parameters. We summarize the current status for the comprehensive searches from the ATLAS and CMS experiments at the LHC. We comment on the prospects for future colliders. An important feature of the theory is that the lightest neutral electroweakino can be identified as a WIMP cold dark matter candidate. We take into account the existing bounds on the parameters from the dark matter direct detection experiments and discuss the complementarity for the electroweakino searches at colliders. |
hep-ph/0211232 | Philip G. Ratcliffe | Philip G. Ratcliffe | Single-Spin Asymmetries and Transversity | 10 pages, 11 figures, presented at the XV International Symposium on
High-Energy Spin Physics (Brookhaven, 9-14 Aug. 2002) | null | 10.1063/1.1607129 | null | hep-ph | null | A pedagogical introduction to single-spin asymmetries (SSA's) and
transversity is presented. Discussion in some detail is made of certain aspects
of (SSA's) in lepton-nucleon and in hadron-hadron scattering and the role of
pQCD and evolution in the context of transversity.
| [
{
"created": "Thu, 14 Nov 2002 23:22:32 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Ratcliffe",
"Philip G.",
""
]
] | A pedagogical introduction to single-spin asymmetries (SSA's) and transversity is presented. Discussion in some detail is made of certain aspects of (SSA's) in lepton-nucleon and in hadron-hadron scattering and the role of pQCD and evolution in the context of transversity. |
1011.1646 | Pomita Ghoshal | Pomita Ghoshal, S.T.Petcov | Neutrino Mass Hierarchy Determination Using Reactor Antineutrinos | 32 pages, 27 figures, accepted in Journal of High Energy Physics | JHEP 1103:058,2011 | 10.1007/JHEP03(2011)058 | Ref. SISSA 77/2010/EP | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Building on earlier studies, we investigate the possibility to determine the
type of neutrino mass spectrum (i.e., "the neutrino mass hierarchy") in a high
statistics reactor electron antineutrino experiment with a relatively large
KamLAND-like detector and an optimal baseline of 60 Km. We analyze
systematically the Fourier Sine and Cosine Transforms (FST and FCT) of
simulated reactor antineutrino data with reference to their specific mass
hierarchy-dependent features discussed earlier in the literature. We perform
also a binned \chi^2 analysis of the sensitivity of simulated reactor electron
antineutrino event spectrum data to the neutrino mass hierarchy, and determine,
in particular, the characteristics of the detector and the experiment (energy
resolution, visible energy threshold, exposure, systematic errors, binning of
data, etc.), which would allow us to get significant information on, or even
determine, the type of the neutrino mass spectrum. We find that if \sin^2
2\theta_{13} is sufficiently large, \sin^2 2\theta_{13} \gtap 0.02, the
requirements on the set-up of interest are very challenging, but not impossible
to realize.
| [
{
"created": "Sun, 7 Nov 2010 15:48:20 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Mar 2011 16:45:43 GMT",
"version": "v2"
}
] | 2011-03-28 | [
[
"Ghoshal",
"Pomita",
""
],
[
"Petcov",
"S. T.",
""
]
] | Building on earlier studies, we investigate the possibility to determine the type of neutrino mass spectrum (i.e., "the neutrino mass hierarchy") in a high statistics reactor electron antineutrino experiment with a relatively large KamLAND-like detector and an optimal baseline of 60 Km. We analyze systematically the Fourier Sine and Cosine Transforms (FST and FCT) of simulated reactor antineutrino data with reference to their specific mass hierarchy-dependent features discussed earlier in the literature. We perform also a binned \chi^2 analysis of the sensitivity of simulated reactor electron antineutrino event spectrum data to the neutrino mass hierarchy, and determine, in particular, the characteristics of the detector and the experiment (energy resolution, visible energy threshold, exposure, systematic errors, binning of data, etc.), which would allow us to get significant information on, or even determine, the type of the neutrino mass spectrum. We find that if \sin^2 2\theta_{13} is sufficiently large, \sin^2 2\theta_{13} \gtap 0.02, the requirements on the set-up of interest are very challenging, but not impossible to realize. |
hep-ph/0610224 | Conrado Albertus-Torres | C. Albertus, J. M. Flynn, E. Hernandez, J. Nieves, J. M.
Verde--Velasco | Quark model study of the semileptonic B -> pi decay | Three pages, two figures. To appear in the proceedings of Quark
Confinament and Hadron Spectrum VII. Azores, September 2006 | AIPConf.Proc.892:312-314,2007 | 10.1063/1.2714403 | SHEP 0633 | hep-ph | null | The semileptonic decay B->pi is studied starting from a simple quark model
and taking into account the effect of the B* resonance. A novel, multiply
subtracted, Omn\`es dispersion relation has been implemented to extend the
predictions of the quark model to all physical q^2 values. We find
|V_{ub}|=0.0034 +/- 0.0003(exp.)+/- 0.0007(theory), in good agreement with
experiment.
| [
{
"created": "Wed, 18 Oct 2006 09:27:56 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Albertus",
"C.",
""
],
[
"Flynn",
"J. M.",
""
],
[
"Hernandez",
"E.",
""
],
[
"Nieves",
"J.",
""
],
[
"Verde--Velasco",
"J. M.",
""
]
] | The semileptonic decay B->pi is studied starting from a simple quark model and taking into account the effect of the B* resonance. A novel, multiply subtracted, Omn\`es dispersion relation has been implemented to extend the predictions of the quark model to all physical q^2 values. We find |V_{ub}|=0.0034 +/- 0.0003(exp.)+/- 0.0007(theory), in good agreement with experiment. |
hep-ph/0103060 | Nestor Armesto Perez | N. S. Amelin, N. Armesto, C. Pajares and D. Sousa | Monte Carlo model for nuclear collisions from SPS to LHC energies | LaTeX, 48 pages, 6 tables, 15 postscript figures included using
epsfig | Eur.Phys.J.C22:149-163,2001 | 10.1007/s100520100761 | UCOFIS 1/01, US-FT/2-01, LPT Orsay 01-15 | hep-ph nucl-th | null | A Monte Carlo model to simulate nuclear collisions in the energy range going
from SPS to LHC, is presented. The model includes in its initial stage both
soft and semihard components, which lead to the formation of color strings.
Collectivity is taken into account considering the possibility of strings in
color representations higher than triplet or antitriplet, by means of string
fusion. String breaking leads to the production of secondaries. At this point,
the model can be used as initial condition for further evolution by a transport
model. In order to tune the parameters and see the results in nucleus-nucleus
collisions, a naif model for rescattering of secondaries is introduced. Results
of the model are compared with experimental data, and predictions for RHIC and
LHC are shown.
| [
{
"created": "Tue, 6 Mar 2001 16:40:26 GMT",
"version": "v1"
}
] | 2016-09-06 | [
[
"Amelin",
"N. S.",
""
],
[
"Armesto",
"N.",
""
],
[
"Pajares",
"C.",
""
],
[
"Sousa",
"D.",
""
]
] | A Monte Carlo model to simulate nuclear collisions in the energy range going from SPS to LHC, is presented. The model includes in its initial stage both soft and semihard components, which lead to the formation of color strings. Collectivity is taken into account considering the possibility of strings in color representations higher than triplet or antitriplet, by means of string fusion. String breaking leads to the production of secondaries. At this point, the model can be used as initial condition for further evolution by a transport model. In order to tune the parameters and see the results in nucleus-nucleus collisions, a naif model for rescattering of secondaries is introduced. Results of the model are compared with experimental data, and predictions for RHIC and LHC are shown. |
1211.2130 | Ilkka Helenius | Ilkka Helenius, Kari J. Eskola, Heli Honkanen and Carlos A. Salgado | EPS09s and EKS98s: Impact parameter dependent nPDF sets | 4 pages, 4 figures, Contribution to the proceedings of the Quark
Matter 2012, Washington D.C., August 12-18, 2012 | null | 10.1016/j.nuclphysa.2013.02.183 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In our recent study we have determined two new spatially dependent nuclear
PDF (nPDF) sets, EPS09s and EKS98s. With these, the hard-process cross-sections
can be calculated in different centrality classes consistently with the
globally analyzed nPDFs for the first time. The sets were determined by
exploiting the $A$-systematics of the globally fitted nPDF sets, EPS09 and
EKS98. For the spatial dependence of the nPDFs we used a power series ansatz in
the nuclear thickness function $T_A$. In this flash talk we introduce the
framework, and present our NLO EPS09s-based predictions for the nuclear
modification factor in four centrality classes for inclusive neutral pion
production in p+Pb collisions at the LHC and for inclusive prompt photon
production in d+Au collisions at RHIC at midrapidity.
| [
{
"created": "Fri, 9 Nov 2012 13:40:57 GMT",
"version": "v1"
}
] | 2015-06-12 | [
[
"Helenius",
"Ilkka",
""
],
[
"Eskola",
"Kari J.",
""
],
[
"Honkanen",
"Heli",
""
],
[
"Salgado",
"Carlos A.",
""
]
] | In our recent study we have determined two new spatially dependent nuclear PDF (nPDF) sets, EPS09s and EKS98s. With these, the hard-process cross-sections can be calculated in different centrality classes consistently with the globally analyzed nPDFs for the first time. The sets were determined by exploiting the $A$-systematics of the globally fitted nPDF sets, EPS09 and EKS98. For the spatial dependence of the nPDFs we used a power series ansatz in the nuclear thickness function $T_A$. In this flash talk we introduce the framework, and present our NLO EPS09s-based predictions for the nuclear modification factor in four centrality classes for inclusive neutral pion production in p+Pb collisions at the LHC and for inclusive prompt photon production in d+Au collisions at RHIC at midrapidity. |
0912.1566 | Richard F. Lebed | Thomas D. Cohen, Daniel L. Shafer, Richard F. Lebed | Baryons in QCD_{AS} at Large N_c: A Roundabout Approach | 9 pages, 9 pdf figures, ReVTeX with pdflatex | Phys.Rev.D81:036006,2010 | 10.1103/PhysRevD.81.036006 | DOE-40762-475, INT-PUB-09-061 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | QCD_{AS}, a variant of large N_c QCD in which quarks transform under the
color two-index antisymmetric representation, reduces to standard QCD at N_c =
3 and provides an alternative to the usual large N_c extrapolation that uses
fundamental representation quarks. Previous strong plausibility arguments
assert that the QCD_{AS} baryon mass scales as N_c^2; however, the complicated
combinatoric problem associated with quarks carrying two color indices impeded
a complete demonstration. We develop a diagrammatic technique to solve this
problem. The key ingredient is the introduction of an effective multi-gluon
vertex: a "traffic circle" or "roundabout" diagram. We show that arbitrarily
complicated diagrams can be reduced to simple ones with the same leading N_c
scaling using this device, and that the leading contribution to baryon mass
does, in fact, scale as N_c^2.
| [
{
"created": "Tue, 8 Dec 2009 18:49:32 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Cohen",
"Thomas D.",
""
],
[
"Shafer",
"Daniel L.",
""
],
[
"Lebed",
"Richard F.",
""
]
] | QCD_{AS}, a variant of large N_c QCD in which quarks transform under the color two-index antisymmetric representation, reduces to standard QCD at N_c = 3 and provides an alternative to the usual large N_c extrapolation that uses fundamental representation quarks. Previous strong plausibility arguments assert that the QCD_{AS} baryon mass scales as N_c^2; however, the complicated combinatoric problem associated with quarks carrying two color indices impeded a complete demonstration. We develop a diagrammatic technique to solve this problem. The key ingredient is the introduction of an effective multi-gluon vertex: a "traffic circle" or "roundabout" diagram. We show that arbitrarily complicated diagrams can be reduced to simple ones with the same leading N_c scaling using this device, and that the leading contribution to baryon mass does, in fact, scale as N_c^2. |
hep-ph/0007140 | Fredrick Olness | S. Kuhlmann, J. Huston, J. Morfin, F. Olness, J. Pumplin, J.F. Owens,
W.K. Tung, J.J. Whitmore | Large-x Parton Distributions | LaTeX, 9 pages, 7 figures. Invited talk presented at the ``Workshop
on Nucleon Structure in the High x-Bjorken Region (HiX2000),'' Temple
University, Philadelphia, Pennsylvania, March 30-April 1, 2000 | null | null | SMU-HEP/00-10 | hep-ph | null | Reliable knowledge of parton distributions at large x is crucial for many
searches for new physics signals in the next generation of collider
experiments. Although these are generally well determined in the small and
medium x range, it has been shown that their uncertainty grows rapidly for
x>0.1. We examine the status of the gluon and quark distributions in light of
new questions that have been raised in the past two years about "large-x"
parton distributions, as well as recent measurements which have improved the
parton uncertainties. Finally, we provide a status report of the data used in
the global analysis, and note some of the open issues where future experiments,
including those planned for Jefferson Labs, might contribute.
| [
{
"created": "Thu, 13 Jul 2000 16:37:00 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kuhlmann",
"S.",
""
],
[
"Huston",
"J.",
""
],
[
"Morfin",
"J.",
""
],
[
"Olness",
"F.",
""
],
[
"Pumplin",
"J.",
""
],
[
"Owens",
"J. F.",
""
],
[
"Tung",
"W. K.",
""
],
[
"Whitmore",
"J. J.",
""
]
] | Reliable knowledge of parton distributions at large x is crucial for many searches for new physics signals in the next generation of collider experiments. Although these are generally well determined in the small and medium x range, it has been shown that their uncertainty grows rapidly for x>0.1. We examine the status of the gluon and quark distributions in light of new questions that have been raised in the past two years about "large-x" parton distributions, as well as recent measurements which have improved the parton uncertainties. Finally, we provide a status report of the data used in the global analysis, and note some of the open issues where future experiments, including those planned for Jefferson Labs, might contribute. |
hep-ph/9301234 | K. Kang | Kyungsik Kang and Alan R. White | Color--Sextet Quark Condensation in QCD | 5 pages | null | null | BROWN-HET-886, ANL-HEP-CP-92-118 | hep-ph | null | We suggest that the sextet color condensation model is not only the simplest
and most attractive scheme to modify the standard model but also may already
have some ``experimental" support. The crucial test may be to observe a short--
lived axion--like $\eta_6$ of mass around 60 GeV/$c^2$ that can produce high
energy photon pairs diffractively at hadron colliders and also radiatively from
$Z^0$ at high energy $e^+ e^-$ colliders. Here we show how high--energy forward
scattering can be affected by diffractive production of the $\eta_6$. Presented
to the DPF-92 meeting.
| [
{
"created": "Tue, 12 Jan 1993 21:32:56 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kang",
"Kyungsik",
""
],
[
"White",
"Alan R.",
""
]
] | We suggest that the sextet color condensation model is not only the simplest and most attractive scheme to modify the standard model but also may already have some ``experimental" support. The crucial test may be to observe a short-- lived axion--like $\eta_6$ of mass around 60 GeV/$c^2$ that can produce high energy photon pairs diffractively at hadron colliders and also radiatively from $Z^0$ at high energy $e^+ e^-$ colliders. Here we show how high--energy forward scattering can be affected by diffractive production of the $\eta_6$. Presented to the DPF-92 meeting. |
1509.06199 | Glenn D. Starkman | Bryan W. Lynn and Glenn D. Starkman | Global $SU(3)_C\times SU(2)_L\times U(1)_Y$ linear sigma model:
axial-vector Ward Takahashi identities, and decoupling of certain heavy BSM
particles due to the Goldstone theorem | Focus on technical results -- existence of a new symmetry represented
by two towers of Ward-Takahashi Identities | Phys. Rev. D 96, 065006 (2017) | 10.1103/PhysRevD.96.065006 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Dedicated to the memory of Raymond Stora (1930-2015). In the $SU(2)_L\times
SU(2)_R$ Linear Sigma Model with PCAC, towers of Ward-Takahashi Identities
(WTI) have long been known to give relations among
1-Scalar-Particle-Irreducible Green's functions, and among I-
Scalar-Particle-Reducible T-Matrix elements, for external scalars (i.e. the
Brout-Englert-Higgs scalar and 3 pseudoscalars). We extend these WTI and the
resulting relations to the $SU(3)_C\times SU(2)_L\times U(1)_Y$ Linear Sigma
Model including the heaviest generation of Standard Model (SM) fermions
supplemented with the minimum necessary neutrino content -- right-handed
neutrinos and Yukawa-coupling-induced Dirac neutrino mass. We extract powerful
constraints on the effective Lagrangian: e.g. showing that they make separate
tadpole renormalization unnecessary, and guarantee infra-red finiteness.
Crucially, ultra-violet quadratic divergences (UVQD) and all other relevant
operators contribute only to $m_\pi^2$, a Nambu-Goldstone boson (NGB)
mass-squared. A WTI between T-Matrix elements (i.e. the Goldstone Theorem) then
enforces $ m_\pi^2=0$ for the true NGB in the spontaneous symmetry breaking
mode of the theory. All relevant operator contributions originating to
all-loop-orders from virtual scalars, quarks and leptons, vanish identically!
Our regularization-scheme-independent results are unchanged by the addition
of certain heavy CP-conserving matter, such as originate in certain Beyond the
SM models. We demonstrate this with two examples: a heavy singlet real scalar
field with $Z_2$ symmetry and no VEV; and a heavy singlet right-handed Type I
See-saw Majorana neutrino. Specifically, we prove that these heavy degrees of
freedom decouple completely from the low-energy effective Lagrangian,
contributing only irrelevant operators after quartic-coupling renormalization.
| [
{
"created": "Mon, 21 Sep 2015 12:06:13 GMT",
"version": "v1"
},
{
"created": "Sun, 14 Aug 2016 18:11:20 GMT",
"version": "v2"
},
{
"created": "Thu, 6 Jul 2017 17:49:39 GMT",
"version": "v3"
},
{
"created": "Sat, 15 Jul 2017 04:42:32 GMT",
"version": "v4"
}
] | 2017-09-20 | [
[
"Lynn",
"Bryan W.",
""
],
[
"Starkman",
"Glenn D.",
""
]
] | Dedicated to the memory of Raymond Stora (1930-2015). In the $SU(2)_L\times SU(2)_R$ Linear Sigma Model with PCAC, towers of Ward-Takahashi Identities (WTI) have long been known to give relations among 1-Scalar-Particle-Irreducible Green's functions, and among I- Scalar-Particle-Reducible T-Matrix elements, for external scalars (i.e. the Brout-Englert-Higgs scalar and 3 pseudoscalars). We extend these WTI and the resulting relations to the $SU(3)_C\times SU(2)_L\times U(1)_Y$ Linear Sigma Model including the heaviest generation of Standard Model (SM) fermions supplemented with the minimum necessary neutrino content -- right-handed neutrinos and Yukawa-coupling-induced Dirac neutrino mass. We extract powerful constraints on the effective Lagrangian: e.g. showing that they make separate tadpole renormalization unnecessary, and guarantee infra-red finiteness. Crucially, ultra-violet quadratic divergences (UVQD) and all other relevant operators contribute only to $m_\pi^2$, a Nambu-Goldstone boson (NGB) mass-squared. A WTI between T-Matrix elements (i.e. the Goldstone Theorem) then enforces $ m_\pi^2=0$ for the true NGB in the spontaneous symmetry breaking mode of the theory. All relevant operator contributions originating to all-loop-orders from virtual scalars, quarks and leptons, vanish identically! Our regularization-scheme-independent results are unchanged by the addition of certain heavy CP-conserving matter, such as originate in certain Beyond the SM models. We demonstrate this with two examples: a heavy singlet real scalar field with $Z_2$ symmetry and no VEV; and a heavy singlet right-handed Type I See-saw Majorana neutrino. Specifically, we prove that these heavy degrees of freedom decouple completely from the low-energy effective Lagrangian, contributing only irrelevant operators after quartic-coupling renormalization. |
1605.01629 | Qin Chang | Qin Chang, Xiaohui Hu, Junfeng Sun, Xiaolin Wang and Yueling Yang | Study of nonleptonic $B_{q}^{\ast}$ ${\to}$ $D_{q}V$ and $P_{q} D^*$
weak decays | 15 pages, 3 tables; the version published in Adv. High Energy Phys | Adv.High Energy Phys. 2015 (2015) 767523 | 10.1155/2015/767523 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by the powerful capability of measurement for the $b$-flavored
hadron rare decays at LHC and SuperKEKB/Belle-II, the nonleptonic
$\bar{B}^{\ast}$ ${\to}$ $D\bar{D}^{\ast}$, $D{\rho^-}$, $DK^{\ast-}$,
${\pi}D^{\ast}$ and $KD^{\ast}$ weak decays are studied in detail. With the
amplitudes calculated with factorization approach and the form factors of
$B^{\ast}$ transition into pseudoscalar meson evaluated with the BSW model,
branching fractions and polarization fractions are firstly presented.
Numerically, the CKM-favored $\bar{B}_{q}^{\ast}$ ${\to}$
$D_{q}D_{s}^{{\ast}-}$ and $D_{q}{\rho}^{-}$ decays have large branching
fractions, $\sim$ $10^{-8}$, which should be sought for with priority and
firstly observed by LHC and Belle-II experiments. The $\bar{B}^{\ast}_q$
${\to}$ $D_qK^{\ast}$ and $D_q{\rho}$ decays are dominated by the longitudinal
polarization states. While, the parallel polarization fractions of
$\bar{B}^{\ast}_q$ ${\to}$ $D_q\bar{D}^{\ast}$ decays are comparable with the
longitudinal ones, numerically, $f_{\parallel}$ $+$ $f_{L}$ ${\simeq}$ 95\% and
$f_{L}:f_{\parallel}$ $\simeq$ $5:4$. Some comparisons between $\bar{B}^{*0}_q$
$\to$ $D_q V$ and their corresponding $\bar{B}^{0}_q$ $\to$ $D^*_q V$ decays
are performed, and the relation $ f_{L,\parallel}(\bar{B}^{\ast 0}\to D
V)\simeq f_{L,\parallel}(\bar{B}^0\to D^{\ast +} V^-) $ is presented. Besides,
with the implication of $SU(3)$ flavor symmetry, some useful ratios $ R_{\rm
du}$ and $ R_{\rm ds}$ are discussed in detail, and suggested to be verified
experimentally.
| [
{
"created": "Thu, 5 May 2016 15:48:59 GMT",
"version": "v1"
}
] | 2016-05-06 | [
[
"Chang",
"Qin",
""
],
[
"Hu",
"Xiaohui",
""
],
[
"Sun",
"Junfeng",
""
],
[
"Wang",
"Xiaolin",
""
],
[
"Yang",
"Yueling",
""
]
] | Motivated by the powerful capability of measurement for the $b$-flavored hadron rare decays at LHC and SuperKEKB/Belle-II, the nonleptonic $\bar{B}^{\ast}$ ${\to}$ $D\bar{D}^{\ast}$, $D{\rho^-}$, $DK^{\ast-}$, ${\pi}D^{\ast}$ and $KD^{\ast}$ weak decays are studied in detail. With the amplitudes calculated with factorization approach and the form factors of $B^{\ast}$ transition into pseudoscalar meson evaluated with the BSW model, branching fractions and polarization fractions are firstly presented. Numerically, the CKM-favored $\bar{B}_{q}^{\ast}$ ${\to}$ $D_{q}D_{s}^{{\ast}-}$ and $D_{q}{\rho}^{-}$ decays have large branching fractions, $\sim$ $10^{-8}$, which should be sought for with priority and firstly observed by LHC and Belle-II experiments. The $\bar{B}^{\ast}_q$ ${\to}$ $D_qK^{\ast}$ and $D_q{\rho}$ decays are dominated by the longitudinal polarization states. While, the parallel polarization fractions of $\bar{B}^{\ast}_q$ ${\to}$ $D_q\bar{D}^{\ast}$ decays are comparable with the longitudinal ones, numerically, $f_{\parallel}$ $+$ $f_{L}$ ${\simeq}$ 95\% and $f_{L}:f_{\parallel}$ $\simeq$ $5:4$. Some comparisons between $\bar{B}^{*0}_q$ $\to$ $D_q V$ and their corresponding $\bar{B}^{0}_q$ $\to$ $D^*_q V$ decays are performed, and the relation $ f_{L,\parallel}(\bar{B}^{\ast 0}\to D V)\simeq f_{L,\parallel}(\bar{B}^0\to D^{\ast +} V^-) $ is presented. Besides, with the implication of $SU(3)$ flavor symmetry, some useful ratios $ R_{\rm du}$ and $ R_{\rm ds}$ are discussed in detail, and suggested to be verified experimentally. |
hep-ph/0406226 | M. Benjamin Portheault | Benjamin Portheault | Strange sea asymmetry from global QCD fits | Presentation at the DIS 2003 conference | International Workshop On Deep Inelastic Scattering, Russie (2003) | null | null | hep-ph | null | We present a preliminary account of a new global QCD analysis of DIS data,
including recent $\nu, \bar \nu$ DIS measurements. The model-independent cross
section reanalysis by CCFR allows a new determination of the strange sea
asymmetry, whose first moment is found to be small. The impact on the NuTeV
measurement of $\sin^2 \theta_W$ is discussed.
| [
{
"created": "Mon, 21 Jun 2004 14:21:00 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Portheault",
"Benjamin",
""
]
] | We present a preliminary account of a new global QCD analysis of DIS data, including recent $\nu, \bar \nu$ DIS measurements. The model-independent cross section reanalysis by CCFR allows a new determination of the strange sea asymmetry, whose first moment is found to be small. The impact on the NuTeV measurement of $\sin^2 \theta_W$ is discussed. |
2005.02009 | Michel Planat Dr | Michel Planat, Raymond Aschheim, Marcelo M. Amaral and Klee Irwin | Informationally complete characters for quark and lepton mixings | 14 pages, 1 figure, 8 tables | MDPI Symmetry 12 (6), 1000 (2020) | 10.3390/sym12061000 | null | hep-ph math.GR math.RT quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A popular account of the mixing patterns for the three generations of quarks
and leptons is through the characters $\kappa$ of a finite group $G$. Here we
introduce a $d$-dimensional Hilbert space with $d=cc(G)$, the number of
conjugacy classes of $G$. Groups under consideration should follow two rules,
(a) the character table contains both two- and three-dimensional
representations with at least one of them faithful and (b) there are minimal
informationally complete measurements under the action of a $d$-dimensional
Pauli group over the characters of these representations. Groups with small $d$
that satisfy these rules coincide in a large part with viable ones derived so
far for reproducing simultaneously the CKM (quark) and PNMS (lepton) mixing
matrices. Groups leading to physical $CP$ violation are singled out.
| [
{
"created": "Tue, 5 May 2020 08:48:52 GMT",
"version": "v1"
}
] | 2020-06-19 | [
[
"Planat",
"Michel",
""
],
[
"Aschheim",
"Raymond",
""
],
[
"Amaral",
"Marcelo M.",
""
],
[
"Irwin",
"Klee",
""
]
] | A popular account of the mixing patterns for the three generations of quarks and leptons is through the characters $\kappa$ of a finite group $G$. Here we introduce a $d$-dimensional Hilbert space with $d=cc(G)$, the number of conjugacy classes of $G$. Groups under consideration should follow two rules, (a) the character table contains both two- and three-dimensional representations with at least one of them faithful and (b) there are minimal informationally complete measurements under the action of a $d$-dimensional Pauli group over the characters of these representations. Groups with small $d$ that satisfy these rules coincide in a large part with viable ones derived so far for reproducing simultaneously the CKM (quark) and PNMS (lepton) mixing matrices. Groups leading to physical $CP$ violation are singled out. |
hep-ph/9612482 | Tomohiro Matsuda | Tomohiro Matsuda | Large N expansion in global and local supersymmetric theories | 64 pages, Latex | null | null | UT-765 | hep-ph hep-th | null | A systematic study of large N expansion in supersymmetric theories are given.
Supersymmetric O(N) non-linear sigma model in two and three dimensions,
massless and massive supersymmetric QCD with $N_{f}<N_{c}-1$ and supergravity
models are analyzed in detail. Our main motivation is to discuss how the
previously studied mechanism for dynamical generation of gaugino condensation
and superpotential is realized in the framework of large N expansion.
| [
{
"created": "Sun, 29 Dec 1996 05:44:12 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Jul 1997 04:32:38 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Matsuda",
"Tomohiro",
""
]
] | A systematic study of large N expansion in supersymmetric theories are given. Supersymmetric O(N) non-linear sigma model in two and three dimensions, massless and massive supersymmetric QCD with $N_{f}<N_{c}-1$ and supergravity models are analyzed in detail. Our main motivation is to discuss how the previously studied mechanism for dynamical generation of gaugino condensation and superpotential is realized in the framework of large N expansion. |
hep-ph/9211257 | null | L. Nellen, K. Mannheim, P.L. Biermann | Neutrino production through hadronic cascades in AGN accretion disks | 12 Pages, LaTeX, TK 92 08 | Phys.Rev.D47:5270-5274,1993 | 10.1103/PhysRevD.47.5270 | null | hep-ph astro-ph | null | We consider the production of neutrinos in active galactic nuclei (AGN)
through hadronic cascades. The initial, high energy nucleons are accelerated in
a source above the accretion disk around the central black hole. From the
source, the particles diffuse back to the disk and initiate hadronic cascades.
The observable output from the cascade are electromagnetic radiation and
neutrinos. We use the observed diffuse background X-ray luminosity, which
presumably results {}from this process, to predict the diffuse neutrino flux
close to existing limits from the Frejus experiment. The resulting neutrino
spectrum is $E^{-2}$ down to the $\GeV$ region. We discuss modifications of
this scenario which reduce the predicted neutrino flux.
| [
{
"created": "Tue, 17 Nov 1992 11:09:31 GMT",
"version": "v1"
}
] | 2009-02-18 | [
[
"Nellen",
"L.",
""
],
[
"Mannheim",
"K.",
""
],
[
"Biermann",
"P. L.",
""
]
] | We consider the production of neutrinos in active galactic nuclei (AGN) through hadronic cascades. The initial, high energy nucleons are accelerated in a source above the accretion disk around the central black hole. From the source, the particles diffuse back to the disk and initiate hadronic cascades. The observable output from the cascade are electromagnetic radiation and neutrinos. We use the observed diffuse background X-ray luminosity, which presumably results {}from this process, to predict the diffuse neutrino flux close to existing limits from the Frejus experiment. The resulting neutrino spectrum is $E^{-2}$ down to the $\GeV$ region. We discuss modifications of this scenario which reduce the predicted neutrino flux. |
hep-ph/9906377 | Dario Sassi Thober | Dario Sassi Thober | The monopoles in the structure of the electron | 8 pages | null | null | CPTUS-05/1999 | hep-ph | null | The classical electron is presented as made up of an electric charge and two
Dirac monopoles of opposite charge performing a magnetic dipole. It is
discussed that a valid variational principle for this system can be defined.
The Dirac quantization condition for charges can be derived in Quantum
Electrodynamics as monopoles are properly defined in the structure. Further
comments on the subject are addressed since the proper care of Dirac strings is
still an open issue.
| [
{
"created": "Tue, 15 Jun 1999 20:04:41 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Thober",
"Dario Sassi",
""
]
] | The classical electron is presented as made up of an electric charge and two Dirac monopoles of opposite charge performing a magnetic dipole. It is discussed that a valid variational principle for this system can be defined. The Dirac quantization condition for charges can be derived in Quantum Electrodynamics as monopoles are properly defined in the structure. Further comments on the subject are addressed since the proper care of Dirac strings is still an open issue. |
0812.4910 | Ramon Herrera | Sergio del Campo and Ramon Herrera | Intermediate inflation on the brane | 12 pages and 2 figures | Phys.Lett.B670:266-270,2009 | 10.1016/j.physletb.2008.11.014 | null | hep-ph astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Brane inflationary universe model in the context of intermediate inflation is
studied. General conditions for this model to be realizable are discussed. In
the high-energy limit we describe in great details the characteristic of this
model.
| [
{
"created": "Mon, 29 Dec 2008 14:10:20 GMT",
"version": "v1"
}
] | 2009-02-26 | [
[
"del Campo",
"Sergio",
""
],
[
"Herrera",
"Ramon",
""
]
] | Brane inflationary universe model in the context of intermediate inflation is studied. General conditions for this model to be realizable are discussed. In the high-energy limit we describe in great details the characteristic of this model. |
hep-ph/0206065 | Giuseppe Nardulli | G. Nardulli (Dipartimento di Fisica Universita' di Bari and I.N.F.N.
Sezione di Bari, Italy) | Effective Fields in Dense Quantum Chromodynamics | 17 pages, Invited review talk at Workshop on Quark Gluon Plasma and
Relativistic Heavy Ions, Frascati, Italy, 14-18 Jan 2002 | null | 10.1142/9789812776532_0020 | BARI-TH 441/02 | hep-ph | null | In the high density, low temperature limit, Quantum Chromodynamics exhibits a
transition to phases characterized by color superconductivity and energy gaps
in the fermion spectra. We review some fundamental results obtained in this
area and in particular we describe the low energy effective lagrangian
describing the motion of the quasi-particles in the high density medium (High
Density Effective Theory).
| [
{
"created": "Thu, 6 Jun 2002 08:05:55 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Nardulli",
"G.",
"",
"Dipartimento di Fisica Universita' di Bari and I.N.F.N.\n Sezione di Bari, Italy"
]
] | In the high density, low temperature limit, Quantum Chromodynamics exhibits a transition to phases characterized by color superconductivity and energy gaps in the fermion spectra. We review some fundamental results obtained in this area and in particular we describe the low energy effective lagrangian describing the motion of the quasi-particles in the high density medium (High Density Effective Theory). |
hep-ph/0502001 | Keith Olive | John Ellis, Keith A. Olive, Yudi Santoso, and Vassilis C. Spanos | Update on the Direct Detection of Supersymmetric Dark Matter | 25 pages, 28 eps figures | Phys.Rev.D71:095007,2005 | 10.1103/PhysRevD.71.095007 | CERN-PH-TH/2005-002, UMN-TH-2342/05, FTPI-MINN-05/01 | hep-ph astro-ph | null | We compare updated predictions for the elastic scattering of supersymmetric
neutralino dark matter with the improved experimental upper limit recently
published by CDMS II. We take into account the possibility that the \pi-nucleon
\Sigma term may be somewhat larger than was previously considered plausible, as
may be supported by the masses of exotic baryons reported recently. We also
incorporate the new central value of m_t, which affects indirectly constraints
on the supersymmetric parameter space, for example via calculations of the
relic density. Even if a large value of \Sigma is assumed, the CDMS II data
currently exclude only small parts of the parameter space in the constrained
MSSM (CMSSM) with universal soft supersymmetry-breaking Higgs, squark and
slepton masses. None of the previously-proposed CMSSM benchmark scenarios is
excluded for any value of \Sigma, and the CDMS II data do not impinge on the
domains of the CMSSM parameter space favoured at the 90 % confidence level in a
recent likelihood analysis. However, some models with non-universal Higgs,
squark and slepton masses and neutralino masses \lappeq 700 GeV are excluded by
the CDMS II data.
| [
{
"created": "Mon, 31 Jan 2005 21:00:28 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Ellis",
"John",
""
],
[
"Olive",
"Keith A.",
""
],
[
"Santoso",
"Yudi",
""
],
[
"Spanos",
"Vassilis C.",
""
]
] | We compare updated predictions for the elastic scattering of supersymmetric neutralino dark matter with the improved experimental upper limit recently published by CDMS II. We take into account the possibility that the \pi-nucleon \Sigma term may be somewhat larger than was previously considered plausible, as may be supported by the masses of exotic baryons reported recently. We also incorporate the new central value of m_t, which affects indirectly constraints on the supersymmetric parameter space, for example via calculations of the relic density. Even if a large value of \Sigma is assumed, the CDMS II data currently exclude only small parts of the parameter space in the constrained MSSM (CMSSM) with universal soft supersymmetry-breaking Higgs, squark and slepton masses. None of the previously-proposed CMSSM benchmark scenarios is excluded for any value of \Sigma, and the CDMS II data do not impinge on the domains of the CMSSM parameter space favoured at the 90 % confidence level in a recent likelihood analysis. However, some models with non-universal Higgs, squark and slepton masses and neutralino masses \lappeq 700 GeV are excluded by the CDMS II data. |
2103.06773 | Johannes Braathen | Johannes Braathen, Mark D. Goodsell, Sebastian Pa{\ss}ehr, Emanuelle
Pinsard | Expectation management | 25 pages, 13 figures; v2: added explanations, matches version
published in EPJC | null | 10.1140/epjc/s10052-021-09285-4 | DESY 21-030, TTK-21-07 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We consider the application of a Fleischer$-$Jegerlehner-like treatment of
tadpoles to the calculation of neutral scalar masses (including the Higgs) in
general theories beyond the Standard Model. This is especially useful when the
theory contains new scalars associated with a small expectation value, but
comes with its own disadvantages. We show that these can be overcome by
combining with effective field theory matching. We provide the formalism in
this modified approach for matching the quartic coupling of the Higgs via pole
masses at one loop, and apply it to both a toy model and to the $\mu$NMSSM as
prototypes where the standard treatment can break down.
| [
{
"created": "Thu, 11 Mar 2021 16:33:50 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Aug 2021 17:28:08 GMT",
"version": "v2"
}
] | 2021-08-06 | [
[
"Braathen",
"Johannes",
""
],
[
"Goodsell",
"Mark D.",
""
],
[
"Paßehr",
"Sebastian",
""
],
[
"Pinsard",
"Emanuelle",
""
]
] | We consider the application of a Fleischer$-$Jegerlehner-like treatment of tadpoles to the calculation of neutral scalar masses (including the Higgs) in general theories beyond the Standard Model. This is especially useful when the theory contains new scalars associated with a small expectation value, but comes with its own disadvantages. We show that these can be overcome by combining with effective field theory matching. We provide the formalism in this modified approach for matching the quartic coupling of the Higgs via pole masses at one loop, and apply it to both a toy model and to the $\mu$NMSSM as prototypes where the standard treatment can break down. |
2204.05510 | Yan Li | Yan Li and Jia-Jun Wu | Inverse scattering problem with a bare state | 28 pages 2 figures | Phys. Rev. D 105, 116024 (2022) | 10.1103/PhysRevD.105.116024 | null | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In hadron physics, molecular-like multihadron states can interact with
compact multiquark states. The latter are modeled as bare states in the Hilbert
space of a potential model. In this work, we study several potential models
relevant to the bare state, and solve their inverse scattering problems. The
first model, called "cc", is a separable potential model. We show that it can
approximate (single-channel short-range) $S$-wave near-threshold physics with
an error of $\mathcal{O}(\beta^3/M_V^3)$, where $\beta$ sets the maximum
momentum of the near-threshold region and $M_V$ is the typical scale of the
potential. The second model, called "bc", serves as the bare-state-dominance
approximation, where interaction between continuum states is ignored. Under
this model, even though the bare state is always crucial for a bound state's
generation, a shallow bound state naturally tends to have a small bare-state
proportion. Therefore, we need other quantities to quantify the importance of
the bare state. The last model, called "bcc", is a combination of the first two
models. This model not only serves as a correction to the bare-state-dominance
approximation, but can also be used to understand the interplay between quark
and hadron degrees of freedom. This model naturally leads to the presence of a
Castillejo-Dalitz-Dyson (CDD) zero. We consider the energy decomposition of a
bound state. The potential ratio of the bare-continuum interaction to the
continuum self-interaction is proposed to understand how the bound state is
generated. Model independently, an inequality for the potential ratio is
derived. Based on the model "bcc", the CDD zero can be used to estimate the
potential ratio. Finally, we apply these studies to the deuteron, $\rho$ meson,
and $D_{s0}^*(2317)$, and analyze their properties.
| [
{
"created": "Tue, 12 Apr 2022 03:47:10 GMT",
"version": "v1"
},
{
"created": "Sun, 3 Jul 2022 00:16:05 GMT",
"version": "v2"
}
] | 2022-07-05 | [
[
"Li",
"Yan",
""
],
[
"Wu",
"Jia-Jun",
""
]
] | In hadron physics, molecular-like multihadron states can interact with compact multiquark states. The latter are modeled as bare states in the Hilbert space of a potential model. In this work, we study several potential models relevant to the bare state, and solve their inverse scattering problems. The first model, called "cc", is a separable potential model. We show that it can approximate (single-channel short-range) $S$-wave near-threshold physics with an error of $\mathcal{O}(\beta^3/M_V^3)$, where $\beta$ sets the maximum momentum of the near-threshold region and $M_V$ is the typical scale of the potential. The second model, called "bc", serves as the bare-state-dominance approximation, where interaction between continuum states is ignored. Under this model, even though the bare state is always crucial for a bound state's generation, a shallow bound state naturally tends to have a small bare-state proportion. Therefore, we need other quantities to quantify the importance of the bare state. The last model, called "bcc", is a combination of the first two models. This model not only serves as a correction to the bare-state-dominance approximation, but can also be used to understand the interplay between quark and hadron degrees of freedom. This model naturally leads to the presence of a Castillejo-Dalitz-Dyson (CDD) zero. We consider the energy decomposition of a bound state. The potential ratio of the bare-continuum interaction to the continuum self-interaction is proposed to understand how the bound state is generated. Model independently, an inequality for the potential ratio is derived. Based on the model "bcc", the CDD zero can be used to estimate the potential ratio. Finally, we apply these studies to the deuteron, $\rho$ meson, and $D_{s0}^*(2317)$, and analyze their properties. |
2312.08796 | Xu-Chang Zheng | Guang-Yu Wang, Xu-Chang Zheng, Xing-Gang Wu, Guang-Zhi Xu | $Z$-boson decays into $S$-wave quarkonium plus a photon up to ${\cal
O}(\alpha_{s} v^2)$ corrections | 8 pages, 2 figures | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In this paper, we calculate the decay widths and branching fractions for the
decays $Z \to H+ \gamma$ up to ${\cal O}(\alpha_{s} v^2)$ accuracy within the
framework of nonrelativistic QCD, where $H$ stands for the $S$-wave quarkonium
$\eta_c$, $J/\psi$, $\eta_b$ or $\Upsilon$, respectively. To compare with the
leading-order terms, those corrections show good perturbative behavior as
expected. It is found that contributions from the next-to-leading order QCD
correction ${\cal O}(\alpha_{s}v^0)$, the relativistic correction ${\cal
O}(\alpha^{0}_{s}v^2)$ and their joint correction ${\cal O}(\alpha_{s} v^2)$
are sizable and comparable to each other, especially for the charmonium case.
Thus we need to take all of them into consideration for a sound estimation. For
a high luminosity electron-positron collider running around the $Z$-pole, due
to $Z$-boson resonance effect, sizable events could be produced from those rare
decay channels.
| [
{
"created": "Thu, 14 Dec 2023 10:30:32 GMT",
"version": "v1"
}
] | 2023-12-15 | [
[
"Wang",
"Guang-Yu",
""
],
[
"Zheng",
"Xu-Chang",
""
],
[
"Wu",
"Xing-Gang",
""
],
[
"Xu",
"Guang-Zhi",
""
]
] | In this paper, we calculate the decay widths and branching fractions for the decays $Z \to H+ \gamma$ up to ${\cal O}(\alpha_{s} v^2)$ accuracy within the framework of nonrelativistic QCD, where $H$ stands for the $S$-wave quarkonium $\eta_c$, $J/\psi$, $\eta_b$ or $\Upsilon$, respectively. To compare with the leading-order terms, those corrections show good perturbative behavior as expected. It is found that contributions from the next-to-leading order QCD correction ${\cal O}(\alpha_{s}v^0)$, the relativistic correction ${\cal O}(\alpha^{0}_{s}v^2)$ and their joint correction ${\cal O}(\alpha_{s} v^2)$ are sizable and comparable to each other, especially for the charmonium case. Thus we need to take all of them into consideration for a sound estimation. For a high luminosity electron-positron collider running around the $Z$-pole, due to $Z$-boson resonance effect, sizable events could be produced from those rare decay channels. |
hep-ph/0512275 | Takuya Mizoguchi | Minoru Biyajima, Takuya Mizoguchi and Naomichi Suzuki | Third order Bose-Einstein correlations by means of Coulomb wave function
revisited | 9 pages, 5 figures | Phys.Lett. B637 (2006) 64-68 | 10.1016/j.physletb.2006.03.067 | null | hep-ph | null | In previous works, in order to include correction by the Coulomb wave
function in Bose-Einstein correlations (BEC), the two-body Coulomb scattering
wave functions have been utilized in the formulation of three-body BEC.
However, the three-body Coulomb scattering wave function, which satisfies
approximately the three-body Coulomb scattering Schrodinger equation, cannot be
written by the product of the two-body scattering wave functions. Therefore, we
reformulate the three-body BEC, and reanalyze the data. A set of reasonable
parameters is obtained.
| [
{
"created": "Wed, 21 Dec 2005 18:23:56 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Mar 2006 18:19:41 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Biyajima",
"Minoru",
""
],
[
"Mizoguchi",
"Takuya",
""
],
[
"Suzuki",
"Naomichi",
""
]
] | In previous works, in order to include correction by the Coulomb wave function in Bose-Einstein correlations (BEC), the two-body Coulomb scattering wave functions have been utilized in the formulation of three-body BEC. However, the three-body Coulomb scattering wave function, which satisfies approximately the three-body Coulomb scattering Schrodinger equation, cannot be written by the product of the two-body scattering wave functions. Therefore, we reformulate the three-body BEC, and reanalyze the data. A set of reasonable parameters is obtained. |
1212.2886 | John Ellis | M. Citron, J. Ellis, F. Luo, J. Marrouche, K. A. Olive and K. J. de
Vries | The End of the CMSSM Coannihilation Strip is Nigh | 33 pages, 19 pdf figures | null | 10.1103/PhysRevD.87.036012 | KCL-PH-TH/2012-46; LCTS/2012-32; CERN-PH-TH/2012-331;
UMN--TH--3127/12; FTPI--MINN--12/38 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A recent global fit to the CMSSM incorporating current constraints on
supersymmetry, including missing transverse energy searches at the LHC, BR(B_s
to mu+ mu-) and the direct XENON100 search for dark matter, favours points
towards the end of the stau-neutralino (stau_1- chi) coannihilation strip with
relatively large m_1/2 and 10 < tan beta < 40 and points in the H/A
rapid-annihilation funnel with tan beta ~ 50. The coannihilation points
typically have m_stau_1-m_chi < 5 GeV, and a significant fraction, including
the most-favoured point, has m_stau_1-m_chi < m_tau. In such a case, the stau_1
lifetime would be so long that the stau_1 would be detectable as a long-lived
massive charged particle that may decay inside or outside the apparatus. We
show that CMSSM scenarios close to the tip of the coannihilation strip for tan
beta < 40 are already excluded by LHC searches for massive charged particles,
and discuss the prospects for their detection in the CMS and ATLAS detectors
via time-of-flight measurements, anomalous heavy ionization or decays into one
or more soft charged particles.
| [
{
"created": "Wed, 12 Dec 2012 17:04:47 GMT",
"version": "v1"
}
] | 2013-03-14 | [
[
"Citron",
"M.",
""
],
[
"Ellis",
"J.",
""
],
[
"Luo",
"F.",
""
],
[
"Marrouche",
"J.",
""
],
[
"Olive",
"K. A.",
""
],
[
"de Vries",
"K. J.",
""
]
] | A recent global fit to the CMSSM incorporating current constraints on supersymmetry, including missing transverse energy searches at the LHC, BR(B_s to mu+ mu-) and the direct XENON100 search for dark matter, favours points towards the end of the stau-neutralino (stau_1- chi) coannihilation strip with relatively large m_1/2 and 10 < tan beta < 40 and points in the H/A rapid-annihilation funnel with tan beta ~ 50. The coannihilation points typically have m_stau_1-m_chi < 5 GeV, and a significant fraction, including the most-favoured point, has m_stau_1-m_chi < m_tau. In such a case, the stau_1 lifetime would be so long that the stau_1 would be detectable as a long-lived massive charged particle that may decay inside or outside the apparatus. We show that CMSSM scenarios close to the tip of the coannihilation strip for tan beta < 40 are already excluded by LHC searches for massive charged particles, and discuss the prospects for their detection in the CMS and ATLAS detectors via time-of-flight measurements, anomalous heavy ionization or decays into one or more soft charged particles. |
1101.4611 | Chong Sheng Li | Jun Gao, Chong Sheng Li, Jian Wang, Hua Xing Zhu, and C.-P. Yuan | Next-to-leading QCD effect to the quark compositeness search at the LHC | Published version in Phys.Rev.Lett | Phys.Rev.Lett.106:142001,2011 | 10.1103/PhysRevLett.106.142001 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, the CMS and ATLAS Collaborations at the CERN Large Hadron Collider
(LHC) have set exclusion limits on the quark compositeness scale by comparing
their data to the leading order and the scaled next-to-leading order (NLO) QCD
calculations, respectively. In this Letter, we present the exact NLO QCD
corrections to the dijet production induced by the quark contact interactions.
We show that as compared to the exact calculation, the scaled NLO QCD
prediction adopted by the ATLAS Collaboration has overestimated the new physics
effect on some direct observables by more than 30% and renders a higher limit
on the quark compositeness scale. The destructive contribution from the exact
NLO correction will also lower the compositeness scale limit set by the CMS
Collaboration.
| [
{
"created": "Mon, 24 Jan 2011 18:15:12 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Apr 2011 13:37:17 GMT",
"version": "v2"
}
] | 2011-04-20 | [
[
"Gao",
"Jun",
""
],
[
"Li",
"Chong Sheng",
""
],
[
"Wang",
"Jian",
""
],
[
"Zhu",
"Hua Xing",
""
],
[
"Yuan",
"C. -P.",
""
]
] | Recently, the CMS and ATLAS Collaborations at the CERN Large Hadron Collider (LHC) have set exclusion limits on the quark compositeness scale by comparing their data to the leading order and the scaled next-to-leading order (NLO) QCD calculations, respectively. In this Letter, we present the exact NLO QCD corrections to the dijet production induced by the quark contact interactions. We show that as compared to the exact calculation, the scaled NLO QCD prediction adopted by the ATLAS Collaboration has overestimated the new physics effect on some direct observables by more than 30% and renders a higher limit on the quark compositeness scale. The destructive contribution from the exact NLO correction will also lower the compositeness scale limit set by the CMS Collaboration. |
2006.07174 | Giorgio Arcadi | Tommi Alanne, Giorgio Arcadi, Florian Goertz, Valentin Tenorth, Stefan
Vogl | Model-independent constraints with extended dark matter EFT | 42 pages, 16 figures | null | 10.1007/JHEP10(2020)172 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We systematically explore the phenomenology of the recently proposed extended
dark matter effective field theory (\eDMEFT), which allows for a consistent
effective description of DM scenarios across different energy scales. The
framework remains applicable at collider energies and is capable of reproducing
the correct relic abundance by including a dynamical mediator particle to the
dark sector, while maintaining correlations dictated by gauge invariance in a
`model-independent' way. Taking into account present and future constraints
from direct- and indirect-detection experiments, from collider searches for
missing energy and for scalar resonances in vector-boson, di-jet, and
Higgs-pair final states, as well as from the relic abundance as measured by
Planck, we determine viable regions in the parameter space, both for scalar and
pseudoscalar mediator. In particular, we point out regions where cancellations
in the direct-detection cross section appear leading to allowed islands for
scalar mediators that could be missed in a naive simplified-model approach, but
are present in the full $D=5$ effective theory, as well as a general opening of
the parameter space due to consistently considering all operators at a given
mass dimension. Thus, canonical WIMP-like scenarios can survive even the next
generation of direct-detection experiments in different mass regimes, while
potentially becoming testable at the high-luminosity LHC.
| [
{
"created": "Fri, 12 Jun 2020 13:32:22 GMT",
"version": "v1"
}
] | 2020-12-02 | [
[
"Alanne",
"Tommi",
""
],
[
"Arcadi",
"Giorgio",
""
],
[
"Goertz",
"Florian",
""
],
[
"Tenorth",
"Valentin",
""
],
[
"Vogl",
"Stefan",
""
]
] | We systematically explore the phenomenology of the recently proposed extended dark matter effective field theory (\eDMEFT), which allows for a consistent effective description of DM scenarios across different energy scales. The framework remains applicable at collider energies and is capable of reproducing the correct relic abundance by including a dynamical mediator particle to the dark sector, while maintaining correlations dictated by gauge invariance in a `model-independent' way. Taking into account present and future constraints from direct- and indirect-detection experiments, from collider searches for missing energy and for scalar resonances in vector-boson, di-jet, and Higgs-pair final states, as well as from the relic abundance as measured by Planck, we determine viable regions in the parameter space, both for scalar and pseudoscalar mediator. In particular, we point out regions where cancellations in the direct-detection cross section appear leading to allowed islands for scalar mediators that could be missed in a naive simplified-model approach, but are present in the full $D=5$ effective theory, as well as a general opening of the parameter space due to consistently considering all operators at a given mass dimension. Thus, canonical WIMP-like scenarios can survive even the next generation of direct-detection experiments in different mass regimes, while potentially becoming testable at the high-luminosity LHC. |
2406.11312 | Laurin Pannullo | Laurin Pannullo, Marc Wagner, Marc Winstel | Regularization effects in the Nambu-Jona-Lasinio model: Strong scheme
dependence of inhomogeneous phases and persistence of the moat regime | 16 pages, 11 figures, 12 pages appendix & references | null | null | null | hep-ph hep-lat | http://creativecommons.org/licenses/by/4.0/ | This work investigates the phase structure of the non-renormalizable
(3+1)-dimensional Nambu-Jona-Lasinio (NJL) model with particular focus on
inhomogeneous phases (IPs), where the chiral condensate is non-uniform in
space, and the closely related moat regimes, where mesonic dispersion relations
favor non-vanishing momenta. We use the mean-field approximation and consider
five different regularization schemes including three lattice discretizations.
The results within the different regularization schemes are systematically
analyzed in order to study the dependence of the IP on the choice of
regulatization scheme and regulator value. The IP exhibits a drastic dependence
on the chosen regularization scheme rendering any physical interpretation of
results on inhomogeneous phases in this model doubtful. In contrast, we find
only a mild scheme dependence of the moat regime suggesting that its existence
is a consequence of the action of the NJL model and its symmetries and, thus,
that it might also exist in QCD.
| [
{
"created": "Mon, 17 Jun 2024 08:19:16 GMT",
"version": "v1"
}
] | 2024-06-18 | [
[
"Pannullo",
"Laurin",
""
],
[
"Wagner",
"Marc",
""
],
[
"Winstel",
"Marc",
""
]
] | This work investigates the phase structure of the non-renormalizable (3+1)-dimensional Nambu-Jona-Lasinio (NJL) model with particular focus on inhomogeneous phases (IPs), where the chiral condensate is non-uniform in space, and the closely related moat regimes, where mesonic dispersion relations favor non-vanishing momenta. We use the mean-field approximation and consider five different regularization schemes including three lattice discretizations. The results within the different regularization schemes are systematically analyzed in order to study the dependence of the IP on the choice of regulatization scheme and regulator value. The IP exhibits a drastic dependence on the chosen regularization scheme rendering any physical interpretation of results on inhomogeneous phases in this model doubtful. In contrast, we find only a mild scheme dependence of the moat regime suggesting that its existence is a consequence of the action of the NJL model and its symmetries and, thus, that it might also exist in QCD. |
2102.11303 | Jorge C. Romao | S\'ergio Carr\^olo, Jorge C. Rom\~ao, Jo\~ao P. Silva and Francisco
Vaz\~ao | Symmetry and decoupling in multi Higgs models | 12 pages | Phys. Rev. D 103, 075026 (2021) | 10.1103/PhysRevD.103.075026 | CFTP/21-004 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We study the scalar sector of the most general multi Higgs doublet model
satisfying explicitly an exact symmetry. We prove that such a model will
exhibit decoupling if and only if the vacuum also satisfies the same symmetry.
This general property is also shown independently and explicitly for three
Higgs doublet models, by considering in detail all symmetry-constrained models
and their possible vacua. We also discuss some specific characteristics of
different decoupling patterns.
| [
{
"created": "Mon, 22 Feb 2021 19:01:03 GMT",
"version": "v1"
}
] | 2021-04-28 | [
[
"Carrôlo",
"Sérgio",
""
],
[
"Romão",
"Jorge C.",
""
],
[
"Silva",
"João P.",
""
],
[
"Vazão",
"Francisco",
""
]
] | We study the scalar sector of the most general multi Higgs doublet model satisfying explicitly an exact symmetry. We prove that such a model will exhibit decoupling if and only if the vacuum also satisfies the same symmetry. This general property is also shown independently and explicitly for three Higgs doublet models, by considering in detail all symmetry-constrained models and their possible vacua. We also discuss some specific characteristics of different decoupling patterns. |
hep-ph/0510247 | Dmitry Shirkov V. | D.V.Shirkov | QCD Effective Couplings in Minkowskian and Euclidean Domains | Contribution to proceedings of "QCD@Work2005" meeting (Bari, July
2005), 7 pages, 3 figures; v2: few other applications (with related
references)added | null | 10.1063/1.2163751 | null | hep-ph | null | We argue for essential upgrading of the defining equations (9.5) and (9.6) in
Section 9.2 "The QCD coupling ... " of PDG review and their use for data
analysis in the light of recent development of the QCD theory. Our claim is
twofold. First, instead of universal expression (9.5) for QCD coupling
$\bar{\alpha}_s$, one should use various ghost-free couplings $\alpha_E(Q^2),
\alpha_M(s)...$ specific for a given physical representation, Euclidean,
Mincowskian etc. Second, instead of power expansion (9.6) for observable, we
recommend to use nonpower functional ones over particular functional sets
${{\cal A}_k(Q^2)}$, ${{\mathfrak A}_k(s)}...$ related by suitable integral
transformations. We remind that use of this modified prescription results in a
better correspondence of reanalyzed low energy data with the high energy ones.
| [
{
"created": "Wed, 19 Oct 2005 09:30:32 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Oct 2005 09:00:49 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Shirkov",
"D. V.",
""
]
] | We argue for essential upgrading of the defining equations (9.5) and (9.6) in Section 9.2 "The QCD coupling ... " of PDG review and their use for data analysis in the light of recent development of the QCD theory. Our claim is twofold. First, instead of universal expression (9.5) for QCD coupling $\bar{\alpha}_s$, one should use various ghost-free couplings $\alpha_E(Q^2), \alpha_M(s)...$ specific for a given physical representation, Euclidean, Mincowskian etc. Second, instead of power expansion (9.6) for observable, we recommend to use nonpower functional ones over particular functional sets ${{\cal A}_k(Q^2)}$, ${{\mathfrak A}_k(s)}...$ related by suitable integral transformations. We remind that use of this modified prescription results in a better correspondence of reanalyzed low energy data with the high energy ones. |
hep-ph/0511266 | Emmanuel Lipmanov | E. M. Lipmanov | On lepton flavor mass-degeneracy-deviation hierarchies and QD-neutrino
mass | 29 pages, footnote corrected, some phrases corrected | null | null | null | hep-ph | null | Two guiding new phenomenological flavor and flavor-electroweak ideas are
expounded in this paper: (I) Oppositeness relation between neutrino and Charged
Lepton Mass-Degeneracy-Deviation quantities. With inputs from the mass and
neutrino oscillation data, it enables two independent estimations of the
neutrino masses m =(0.11-0.30)eV and m =(0.11-0.16) eV. Small value of the
neutrino oscillation hierarchy parameter is a consistency condition. (II)
Essential connection between lepton mass hierarchies and low energy electroweak
coupling constants. It enables an independent estimation of the QD-neutrino
mass m = (0.11-0.14) eV, and renders three sequential charged lepton copies
into one flavor system with the elementary charge encoded in the three-flavor
mass hierarchy. An exact relation between the fine structure constant at Q2=0
and the experimental charged lepton mass-ratio parameter exp(-5) is observed.
Experimental evidence is suggesting that this parameter has physical meaning of
a dimensionless universal parameter that links flavor and electroweak
quantities in accord with the guiding idea (II).
| [
{
"created": "Wed, 23 Nov 2005 00:25:21 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Dec 2005 19:55:39 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Lipmanov",
"E. M.",
""
]
] | Two guiding new phenomenological flavor and flavor-electroweak ideas are expounded in this paper: (I) Oppositeness relation between neutrino and Charged Lepton Mass-Degeneracy-Deviation quantities. With inputs from the mass and neutrino oscillation data, it enables two independent estimations of the neutrino masses m =(0.11-0.30)eV and m =(0.11-0.16) eV. Small value of the neutrino oscillation hierarchy parameter is a consistency condition. (II) Essential connection between lepton mass hierarchies and low energy electroweak coupling constants. It enables an independent estimation of the QD-neutrino mass m = (0.11-0.14) eV, and renders three sequential charged lepton copies into one flavor system with the elementary charge encoded in the three-flavor mass hierarchy. An exact relation between the fine structure constant at Q2=0 and the experimental charged lepton mass-ratio parameter exp(-5) is observed. Experimental evidence is suggesting that this parameter has physical meaning of a dimensionless universal parameter that links flavor and electroweak quantities in accord with the guiding idea (II). |
hep-ph/9803305 | Sven Bergmann | Sven Bergmann, Alex Kagan | Z-induced FCNCs and their effects on Neutrino Oscillations | 23 pages (including 5 eps-figures), Latex; references [29-34] were
added to the revised version | Nucl.Phys.B538:368-386,1999 | 10.1016/S0550-3213(98)00686-5 | WIS-98/4/MAR-DPP | hep-ph | null | Adding singlet neutrinos to the standard model spectrum in general gives rise
to Z-induced flavor-changing neutral currents. We study the impact of these
currents on matter-induced neutrino oscillations in the sun and in supernovae.
While the effects for solar neutrinos are negligible, dramatic effects are
possible for supernova neutrinos.
| [
{
"created": "Wed, 11 Mar 1998 16:42:37 GMT",
"version": "v1"
},
{
"created": "Tue, 31 Mar 1998 11:03:11 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Bergmann",
"Sven",
""
],
[
"Kagan",
"Alex",
""
]
] | Adding singlet neutrinos to the standard model spectrum in general gives rise to Z-induced flavor-changing neutral currents. We study the impact of these currents on matter-induced neutrino oscillations in the sun and in supernovae. While the effects for solar neutrinos are negligible, dramatic effects are possible for supernova neutrinos. |
hep-ph/0608056 | Bertram Klein | L. Jendges (1), B. Klein (2), H.-J. Pirner (1 and 3), K. Schwenzer (4)
((1) Institute for Theoretical Physics, University of Heidelberg, (2) GSI,
Darmstadt, (3) Max-Planck-Institut fuer Kernphysik, Heidelberg, (4) Institute
for Physics, University of Graz) | Chiral Expansion from Renormalization Group Flow Equations | 31 pages, 6 figures, revtex 4 | null | null | null | hep-ph | null | We explore the influence of the current quark mass on observables in the low
energy regime of hadronic interactions within a renormalization group analysis
of the Nambu-Jona-Lasinio model in its bosonized form. We derive current quark
mass expansions for the pion decay constant and the pion mass, and we recover
analytically the universal logarithmic dependence. A numerical solution of the
renormalization group flow equations enables us to determine effective low
energy constants from the model. We find values consistent with the
phenomenological estimates used in chiral perturbation theory.
| [
{
"created": "Fri, 4 Aug 2006 14:06:58 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Jendges",
"L.",
"",
"1 and 3"
],
[
"Klein",
"B.",
"",
"1 and 3"
],
[
"Pirner",
"H. -J.",
"",
"1 and 3"
],
[
"Schwenzer",
"K.",
""
]
] | We explore the influence of the current quark mass on observables in the low energy regime of hadronic interactions within a renormalization group analysis of the Nambu-Jona-Lasinio model in its bosonized form. We derive current quark mass expansions for the pion decay constant and the pion mass, and we recover analytically the universal logarithmic dependence. A numerical solution of the renormalization group flow equations enables us to determine effective low energy constants from the model. We find values consistent with the phenomenological estimates used in chiral perturbation theory. |
1704.03412 | Ismail Zahed | Yizhuang Liu and Ismail Zahed | Heavy Baryons and their Exotics from Instantons in Holographic QCD | 11 pages, 1 figure. arXiv admin note: text overlap with
arXiv:1611.03757 | null | 10.1103/PhysRevD.95.116012 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use a variant of the $D4$-$D8$ construction that includes two chiral and
one heavy meson, to describe heavy-light baryons and their exotics as heavy
mesons bound to a flavor instanton in bulk. At strong coupling, the heavy meson
is shown to {\it always bind} in the form of a flavor instanton zero mode in
the fundamental representation. The ensuing instanton moduli for the heavy
baryons exhibits both chiral and heavy quark symmetry. We detail how to
quantize it, and derive model independent mass relations for heavy bayons with
a single-heavy quark in leading order, in overall agreement with the reported
baryonic spectra with one charm or bottom. We also discuss the low-lying masses
and quantum assignments for the even and odd parity states, some of which are
yet to be observed. We extend our analysis to double-heavy pentaquarks with
hidden charm and bottom. In leading order, we find a pair of doube-heavy
iso-doublets with $IJ^\pi=\frac 12 {\frac 12}^-, \frac 12 {\frac 32}^-$
assignments for all heavy flavor combinations. We also find five new Delta-like
pentaquark states with $IJ^\pi=\frac 32 {\frac 12}^-, \frac 32 {\frac 32}^-,
\frac 32 {\frac 52}^-$ assignments for both charm and bottom.
| [
{
"created": "Tue, 11 Apr 2017 16:56:52 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Apr 2017 20:08:47 GMT",
"version": "v2"
},
{
"created": "Fri, 21 Apr 2017 13:27:32 GMT",
"version": "v3"
},
{
"created": "Wed, 26 Apr 2017 23:49:08 GMT",
"version": "v4"
}
] | 2017-08-02 | [
[
"Liu",
"Yizhuang",
""
],
[
"Zahed",
"Ismail",
""
]
] | We use a variant of the $D4$-$D8$ construction that includes two chiral and one heavy meson, to describe heavy-light baryons and their exotics as heavy mesons bound to a flavor instanton in bulk. At strong coupling, the heavy meson is shown to {\it always bind} in the form of a flavor instanton zero mode in the fundamental representation. The ensuing instanton moduli for the heavy baryons exhibits both chiral and heavy quark symmetry. We detail how to quantize it, and derive model independent mass relations for heavy bayons with a single-heavy quark in leading order, in overall agreement with the reported baryonic spectra with one charm or bottom. We also discuss the low-lying masses and quantum assignments for the even and odd parity states, some of which are yet to be observed. We extend our analysis to double-heavy pentaquarks with hidden charm and bottom. In leading order, we find a pair of doube-heavy iso-doublets with $IJ^\pi=\frac 12 {\frac 12}^-, \frac 12 {\frac 32}^-$ assignments for all heavy flavor combinations. We also find five new Delta-like pentaquark states with $IJ^\pi=\frac 32 {\frac 12}^-, \frac 32 {\frac 32}^-, \frac 32 {\frac 52}^-$ assignments for both charm and bottom. |
2011.01212 | Marco Fedele | Marco Ciuchini, Marco Fedele, Enrico Franco, Ayan Paul, Luca
Silvestrini and Mauro Valli | Lessons from the $B^{0,+}\to K^{*0,+}\mu^+\mu^-$ angular analyses | References added, typos fixed, conclusions unchanged. 7 pages, 3
figures, 1 table | Phys. Rev. D 103, 015030 (2021) | 10.1103/PhysRevD.103.015030 | DESY 20-190, HU-EP-20/30, TTP20-037, P3H-20-064, UCI-TR 2020-18 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform an analysis within the Standard Model of $B^{0,+} \to K^{*0,+}
\mu^+ \mu^-$ decays in light of the recent measurements from the LHCb
experiment, showing that new data strengthen the need for sizable hadronic
contributions and correlations among them. We then extend our analysis to New
Physics via the Standard Model Effective Theory, and carry out a
state-of-the-art fit of available $b \to s \ell^+ \ell^-$ data, including
possible hadronic contributions. We find the case of a fully left-handed
operator standing out as the simplest scenario with a significance of almost
$6\sigma$.
| [
{
"created": "Mon, 2 Nov 2020 18:57:51 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Nov 2020 19:46:22 GMT",
"version": "v2"
}
] | 2021-02-03 | [
[
"Ciuchini",
"Marco",
""
],
[
"Fedele",
"Marco",
""
],
[
"Franco",
"Enrico",
""
],
[
"Paul",
"Ayan",
""
],
[
"Silvestrini",
"Luca",
""
],
[
"Valli",
"Mauro",
""
]
] | We perform an analysis within the Standard Model of $B^{0,+} \to K^{*0,+} \mu^+ \mu^-$ decays in light of the recent measurements from the LHCb experiment, showing that new data strengthen the need for sizable hadronic contributions and correlations among them. We then extend our analysis to New Physics via the Standard Model Effective Theory, and carry out a state-of-the-art fit of available $b \to s \ell^+ \ell^-$ data, including possible hadronic contributions. We find the case of a fully left-handed operator standing out as the simplest scenario with a significance of almost $6\sigma$. |
1803.10242 | Alfredo Urbano | Christian Gross, Antonello Polosa, Alessandro Strumia, Alfredo Urbano,
Wei Xue | Dark Matter in the Standard Model? | 31 pages, 11 figures. v2: final version to appear on PRD; added
comments about arXiv:1805.03723 | Phys. Rev. D 98, 063005 (2018) | 10.1103/PhysRevD.98.063005 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We critically reexamine two possible Dark Matter candidate within the
Standard Model. First, we consider the $uuddss$ exa-quark. Its QCD binding
energy could be large enough to make it (quasi) stable. We show that the
cosmological Dark Matter abundance is reproduced thermally if its mass is 1.2
GeV. However, we also find that such mass is excluded by the stability of
Oxygen nuclei. Second, we consider the possibility that the instability in the
Higgs potential leads to the formation of primordial black holes while avoiding
vacuum decay during inflation. We show that the non-minimal Higgs coupling to
gravity must be as small as allowed by quantum corrections, $|\xi_H| < 0.01$.
Even so, one must assume that the Universe survived in $e^{120}$ independent
regions to fluctuations that lead to vacuum decay with probability 1/2 each.
| [
{
"created": "Tue, 27 Mar 2018 18:00:07 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Sep 2018 06:47:21 GMT",
"version": "v2"
}
] | 2018-09-19 | [
[
"Gross",
"Christian",
""
],
[
"Polosa",
"Antonello",
""
],
[
"Strumia",
"Alessandro",
""
],
[
"Urbano",
"Alfredo",
""
],
[
"Xue",
"Wei",
""
]
] | We critically reexamine two possible Dark Matter candidate within the Standard Model. First, we consider the $uuddss$ exa-quark. Its QCD binding energy could be large enough to make it (quasi) stable. We show that the cosmological Dark Matter abundance is reproduced thermally if its mass is 1.2 GeV. However, we also find that such mass is excluded by the stability of Oxygen nuclei. Second, we consider the possibility that the instability in the Higgs potential leads to the formation of primordial black holes while avoiding vacuum decay during inflation. We show that the non-minimal Higgs coupling to gravity must be as small as allowed by quantum corrections, $|\xi_H| < 0.01$. Even so, one must assume that the Universe survived in $e^{120}$ independent regions to fluctuations that lead to vacuum decay with probability 1/2 each. |
1809.06985 | David R. Entem | D.R. Entem, P.G. Ortega, J. Segovia, F. Fern\'andez | Heavy mesons in the Quark Model | Contribution to the Proceedings of the 15th International Workshop on
Meson Physics - MESON2018 | null | 10.1051/epjconf/201919901012 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Since the discovery of the $J/\psi$, the quark model was very successful in
describing the spectrum and properties of heavy mesons including only $q\bar q$
components. However since 2003, with the discovery of the $X(3872)$, many
states that can not be accommodated on the naive quark model have been
discovered, and they made unavoidable to include higher Fock components on the
heavy meson states. We will give an overview of the success of the quark model
for heavy mesons and point some of the states that are likely to be more
complicated structures such as meson-meson molecules.
| [
{
"created": "Wed, 19 Sep 2018 02:17:49 GMT",
"version": "v1"
}
] | 2019-02-20 | [
[
"Entem",
"D. R.",
""
],
[
"Ortega",
"P. G.",
""
],
[
"Segovia",
"J.",
""
],
[
"Fernández",
"F.",
""
]
] | Since the discovery of the $J/\psi$, the quark model was very successful in describing the spectrum and properties of heavy mesons including only $q\bar q$ components. However since 2003, with the discovery of the $X(3872)$, many states that can not be accommodated on the naive quark model have been discovered, and they made unavoidable to include higher Fock components on the heavy meson states. We will give an overview of the success of the quark model for heavy mesons and point some of the states that are likely to be more complicated structures such as meson-meson molecules. |
hep-ph/0512088 | HockSeng Goh | Z. Chacko, Hock-Seng Goh (Arizona U.), Roni Harnik (SLAC & Stanford
U.) | A Twin Higgs Model from Left-Right Symmetry | 9 pages, 1 figure | JHEP 0601 (2006) 108 | 10.1088/1126-6708/2006/01/108 | SLAC-PUB-11595 | hep-ph | null | We present twin Higgs models based on the extension of the Standard Model to
left-right symmetry that protect the weak scale against radiative corrections
up to scales of order 5 TeV. In the ultra-violet the Higgs sector of these
theories respects an approximate global symmetry, in addition to the discrete
parity symmetry characteristic of left-right symmetric models. The Standard
Model Higgs field emerges as the pseudo-Goldstone boson associated with the
breaking of the global symmetry. The parity symmetry tightly constrains the
form of radiative corrections to the Higgs potential, allowing natural
electroweak breaking. The minimal model predicts a rich spectrum of exotic
particles that will be accessible to upcoming experiments, and which are
necessary for the cancellation of one-loop quadratic divergences. These include
right-handed gauge bosons with masses not to exceed a few TeV and a pair of
vector-like quarks with masses of order several hundred GeV.
| [
{
"created": "Wed, 7 Dec 2005 18:50:18 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Chacko",
"Z.",
"",
"Arizona U."
],
[
"Goh",
"Hock-Seng",
"",
"Arizona U."
],
[
"Harnik",
"Roni",
"",
"SLAC & Stanford\n U."
]
] | We present twin Higgs models based on the extension of the Standard Model to left-right symmetry that protect the weak scale against radiative corrections up to scales of order 5 TeV. In the ultra-violet the Higgs sector of these theories respects an approximate global symmetry, in addition to the discrete parity symmetry characteristic of left-right symmetric models. The Standard Model Higgs field emerges as the pseudo-Goldstone boson associated with the breaking of the global symmetry. The parity symmetry tightly constrains the form of radiative corrections to the Higgs potential, allowing natural electroweak breaking. The minimal model predicts a rich spectrum of exotic particles that will be accessible to upcoming experiments, and which are necessary for the cancellation of one-loop quadratic divergences. These include right-handed gauge bosons with masses not to exceed a few TeV and a pair of vector-like quarks with masses of order several hundred GeV. |
1803.07224 | Fukuko Yuasa | H Daisaka, N Nakasato, T Ishikawa, F Yuasa, K Nitadori | A development of an accelerator board dedicated for multi-precision
arithmetic operations and its application to Feynman loop integrals II | 7 pages, 4 figures, in proceedings of the 18th International Workshop
on Advanced Computing and Analysis Techniques in Physics Research (ACAT 2017) | null | null | null | hep-ph physics.comp-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Evaluation of a wide variety of Feynman diagrams with multi-loop integrals
and physical parameters and its comparison with high energy experiments are
expected to investigate new physics beyond the Standard Model. We have been
developing a direct computation method of multi-loop integrals of Feynman
diagrams. One of features of our method is that we adopt the double exponential
rule for numerical integrations which enables us to evaluate loop integrals
with boundary singularities. Another feature is that in order to accelerate the
numerical integrations with multi-precision calculations, we develop an
accelerator system with Field Programmable Gate Array boards on which
processing elements with dedicated logic for quadruple/hexuple/octuple
precision arithmetic operations are implemented. In addition, we also develop a
programming interface designed for easy use of the system. The development is
continued for practical use of the system. We present the current development
of our system, and the numerical results of higher-loop diagrams performed
using our system.
| [
{
"created": "Tue, 20 Mar 2018 02:38:08 GMT",
"version": "v1"
}
] | 2018-03-21 | [
[
"Daisaka",
"H",
""
],
[
"Nakasato",
"N",
""
],
[
"Ishikawa",
"T",
""
],
[
"Yuasa",
"F",
""
],
[
"Nitadori",
"K",
""
]
] | Evaluation of a wide variety of Feynman diagrams with multi-loop integrals and physical parameters and its comparison with high energy experiments are expected to investigate new physics beyond the Standard Model. We have been developing a direct computation method of multi-loop integrals of Feynman diagrams. One of features of our method is that we adopt the double exponential rule for numerical integrations which enables us to evaluate loop integrals with boundary singularities. Another feature is that in order to accelerate the numerical integrations with multi-precision calculations, we develop an accelerator system with Field Programmable Gate Array boards on which processing elements with dedicated logic for quadruple/hexuple/octuple precision arithmetic operations are implemented. In addition, we also develop a programming interface designed for easy use of the system. The development is continued for practical use of the system. We present the current development of our system, and the numerical results of higher-loop diagrams performed using our system. |
0906.3773 | Yoshiharu Kawamura | Yoshiharu Kawamura | Misleading Coupling Unification and Lifshitz Type Gauge Theory | 15 pages, 1 figure, two footnotes with references added, typos
corrected | Prog.Theor.Phys.122:831-845,2010 | 10.1143/PTP.122.831 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a new grand unification scenario for ensuring proton stability.
Our scenario is based on the idea that the proton decay problem is an
artificial one, which is caused from the identification of the gauge coupling
unification scale with the grand unification scale or the grand unified
symmetry breaking scale. We discuss a Lifshitz type gauge theory as a candidate
to realize our scenario.
| [
{
"created": "Sat, 20 Jun 2009 03:32:24 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Jun 2009 08:25:44 GMT",
"version": "v2"
},
{
"created": "Wed, 15 Jul 2009 06:42:46 GMT",
"version": "v3"
},
{
"created": "Mon, 10 Aug 2009 07:07:41 GMT",
"version": "v4"
},
{
"created": "Fri, 14 Aug 2009 01:27:51 GMT",
"version": "v5"
}
] | 2010-01-15 | [
[
"Kawamura",
"Yoshiharu",
""
]
] | We propose a new grand unification scenario for ensuring proton stability. Our scenario is based on the idea that the proton decay problem is an artificial one, which is caused from the identification of the gauge coupling unification scale with the grand unification scale or the grand unified symmetry breaking scale. We discuss a Lifshitz type gauge theory as a candidate to realize our scenario. |
1208.2784 | Adam Martin | R. Fok, Graham D. Kribs, Adam Martin, Yuhsin Tsai | Electroweak Baryogenesis in R-symmetric Supersymmetry | 17 pages, 8 figures | null | 10.1103/PhysRevD.87.055018 | FERMILAB-PUB-12-454-T | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We demonstrate that electroweak baryogenesis can occur in a supersymmetric
model with an exact R-symmetry. The minimal R-symmetric supersymmetric model
contains chiral superfields in the adjoint representation, giving Dirac gaugino
masses, and an additional set of "R-partner" Higgs superfields, giving
R-symmetric \mu-terms. New superpotential couplings between the adjoints and
the Higgs fields can simultaneously increase the strength of the electroweak
phase transition and provide additional tree-level contributions to the
lightest Higgs mass. Notably, no light stop is present in this framework, and
in fact, we require both stops to be above a few TeV to provide sufficient
radiative corrections to the lightest Higgs mass to bring it up to 125 GeV.
Large CP-violating phases in the gaugino/higgsino sector allow us to match the
baryon asymmetry of the Universe with no constraints from electric dipole
moments due to R-symmetry. We briefly discuss some of the more interesting
phenomenology, particularly of the of the lightest CP-odd scalar.
| [
{
"created": "Tue, 14 Aug 2012 04:55:49 GMT",
"version": "v1"
}
] | 2013-03-27 | [
[
"Fok",
"R.",
""
],
[
"Kribs",
"Graham D.",
""
],
[
"Martin",
"Adam",
""
],
[
"Tsai",
"Yuhsin",
""
]
] | We demonstrate that electroweak baryogenesis can occur in a supersymmetric model with an exact R-symmetry. The minimal R-symmetric supersymmetric model contains chiral superfields in the adjoint representation, giving Dirac gaugino masses, and an additional set of "R-partner" Higgs superfields, giving R-symmetric \mu-terms. New superpotential couplings between the adjoints and the Higgs fields can simultaneously increase the strength of the electroweak phase transition and provide additional tree-level contributions to the lightest Higgs mass. Notably, no light stop is present in this framework, and in fact, we require both stops to be above a few TeV to provide sufficient radiative corrections to the lightest Higgs mass to bring it up to 125 GeV. Large CP-violating phases in the gaugino/higgsino sector allow us to match the baryon asymmetry of the Universe with no constraints from electric dipole moments due to R-symmetry. We briefly discuss some of the more interesting phenomenology, particularly of the of the lightest CP-odd scalar. |
hep-ph/0108006 | Shrihari Gopalakrishna | Shrihari Gopalakrishna, James Wells | Superlight gravitinos in electron-photon collisions | 8 pages Added 2 terms to eqn(3) for easy reference and other minor
changes to improve clarity | Phys.Lett.B518:123-127,2001 | 10.1016/S0370-2693(01)01038-3 | LBNL-48649 | hep-ph | null | Motivated by recent studies of supersymmetry in higher-dimensional spaces, we
discuss the experimental signatures of a superlight gravitino, mass < 0.001 eV.
We concentrate on the process (e- gamma -> selectronR gravitino) as a probe of
supersymmetry, where a single heavy superpartner and a superlight gravitino are
produced. The fact that there is only one heavy superpartner in the final state
in this process would require a lower center-of-mass energy for on-shell
production compared to conventional pair production. For instance, for a 500
GeV machine, we find that a positive signal will be found if the supersymmetry
breaking scale is less than about 2 TeV. If no positive signal is found, this
process puts a bound on the supersymmetry breaking scale.
| [
{
"created": "Wed, 1 Aug 2001 20:15:51 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Aug 2001 20:47:24 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Gopalakrishna",
"Shrihari",
""
],
[
"Wells",
"James",
""
]
] | Motivated by recent studies of supersymmetry in higher-dimensional spaces, we discuss the experimental signatures of a superlight gravitino, mass < 0.001 eV. We concentrate on the process (e- gamma -> selectronR gravitino) as a probe of supersymmetry, where a single heavy superpartner and a superlight gravitino are produced. The fact that there is only one heavy superpartner in the final state in this process would require a lower center-of-mass energy for on-shell production compared to conventional pair production. For instance, for a 500 GeV machine, we find that a positive signal will be found if the supersymmetry breaking scale is less than about 2 TeV. If no positive signal is found, this process puts a bound on the supersymmetry breaking scale. |
1510.00311 | Stefan de Boer | Stefan de Boer and Gudrun Hiller | Flavor & new physics opportunities with rare charm decays into leptons | 19 pages plus references and appendices, 5 figures; v2:
$\eta^{(\prime)}$ contribution fixed, references added, conclusion unchanged;
v3: typos corrected and clarifications and references added, conclusions
unchanged | Phys. Rev. D 93, 074001 (2016) | 10.1103/PhysRevD.93.074001 | DO-TH 15/10, QFET-2015-25 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Updated standard model predictions for $D_{(s)} \to P l^+ l^-$, $l=e,\mu$,
$P=\pi,K$ and inclusive decays are presented. Model-independent constraints on
$|\Delta C|=|\Delta U|=1$ Wilson coefficients are worked out. New physics (NP)
opportunities arise in semileptonic branching ratios for very large couplings
only, however, are not excluded outside the resonance regions yet. The NP
potential of resonance-assisted CP asymmetries and angular observables is
worked out. Predictions are given for leptoquark models, and include lepton
flavor violating and dineutrino decays. Whether NP can be seen depends on
flavor patterns, and vice versa.
| [
{
"created": "Thu, 1 Oct 2015 16:50:31 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Oct 2015 13:37:37 GMT",
"version": "v2"
},
{
"created": "Tue, 22 Mar 2016 16:37:18 GMT",
"version": "v3"
}
] | 2016-04-06 | [
[
"de Boer",
"Stefan",
""
],
[
"Hiller",
"Gudrun",
""
]
] | Updated standard model predictions for $D_{(s)} \to P l^+ l^-$, $l=e,\mu$, $P=\pi,K$ and inclusive decays are presented. Model-independent constraints on $|\Delta C|=|\Delta U|=1$ Wilson coefficients are worked out. New physics (NP) opportunities arise in semileptonic branching ratios for very large couplings only, however, are not excluded outside the resonance regions yet. The NP potential of resonance-assisted CP asymmetries and angular observables is worked out. Predictions are given for leptoquark models, and include lepton flavor violating and dineutrino decays. Whether NP can be seen depends on flavor patterns, and vice versa. |
1604.06161 | Kunihiko Terasaki | Kunihiko Terasaki | Production of Neutral and Doubly Charged Partners of D_{s0}^+(2317)
Revisited | 6 pages, 1 figure | null | null | YITP-16-51 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Rates for productions of neutral and doubly charged partners of
D_{s0}^+(2317) in B meson decays are studied by using a hard D meson
approximation in the infinite momentum frame, and the results are of the same
order of magnitude as that of D_{s0}^+(2317). Because the bottom-strange
X^{+-}(5568) which can be interpreted as iso-triplet bottom partners of
D_{s0}^+(2317) have recently been discovered, observations of neutral and
doubly charged partners of D_{s0}^+(2317) are strongly desired.
| [
{
"created": "Thu, 21 Apr 2016 02:33:34 GMT",
"version": "v1"
}
] | 2016-04-22 | [
[
"Terasaki",
"Kunihiko",
""
]
] | Rates for productions of neutral and doubly charged partners of D_{s0}^+(2317) in B meson decays are studied by using a hard D meson approximation in the infinite momentum frame, and the results are of the same order of magnitude as that of D_{s0}^+(2317). Because the bottom-strange X^{+-}(5568) which can be interpreted as iso-triplet bottom partners of D_{s0}^+(2317) have recently been discovered, observations of neutral and doubly charged partners of D_{s0}^+(2317) are strongly desired. |
hep-ph/9912239 | A. N. Mitra | A.N.Mitra | 3D-4D Interlinkage Of B-S Amplitudes : Unified View Of QQbar And QQQ
Dynamics | LaTex file, 37 pages | null | null | null | hep-ph | null | This article has a 3-fold objective: i) to provide a panoramic view of
several types of 3D vs 4D approaches in Field Theory (Tamm-Dancoff, Bethe
Salpeter Equation (BSE), Quasi-potentials, Light-Front Dynamics, etc) for
strong interaction dunamics; ii) to focus on the role of the Markov-Yukawa
Transversality Principle (MYTP) as a novel paradigm for an exact 3D-4D
interlinkage between the corresponding BSE amplitudes; iii) Stress on a closely
parallel treatment of $q{\bar q}$ and qqq BSE's stemming from a common
4-fermion Lagrangian mediated by gluon (vector)-like exchange. The two-way
interlinkage offered by MYTP between the 3D and 4D BSE forms via a
Lorentz-covariant 3D support to the BS kernel, gives it a unique status which
distinguishes it from most other 3D approaches to strong interaction dynamics,
which give at most a one-way connection. Two specific types of MYTP which
provide 3D support to the BSE kernel, are considered: a) Covariant
Instantaneity Ansatz (CIA); b) Covariant LF/NP ansatz (Cov.LF). Both lead to
formaly identical 3D BSE reductions (thus ensuring common spectral
predictions), but their 4D manifestations differ sharply: Under CIA, the 4D
loop integrals suffer from Lorentz mismatch of the vertex functions, leading to
ill-defined time-like momentum integrals, but Cov LF is free from this disease.
Some practical uses of MYTP as a basis for evaluating various types of 4D loop
integrals are outlined. PACS: 11.10 st ; 12.38 Lg ; 13.40.Fn Keywords:
Tamm-Dancoff, Bethe-Salpeter, Quasi-potentials, Light-front (LF),
Markov-Yukawa, 3D-4D Interlinkage, CIA, Cov-LF, Spectroscopy.
| [
{
"created": "Sat, 4 Dec 1999 06:45:00 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Mitra",
"A. N.",
""
]
] | This article has a 3-fold objective: i) to provide a panoramic view of several types of 3D vs 4D approaches in Field Theory (Tamm-Dancoff, Bethe Salpeter Equation (BSE), Quasi-potentials, Light-Front Dynamics, etc) for strong interaction dunamics; ii) to focus on the role of the Markov-Yukawa Transversality Principle (MYTP) as a novel paradigm for an exact 3D-4D interlinkage between the corresponding BSE amplitudes; iii) Stress on a closely parallel treatment of $q{\bar q}$ and qqq BSE's stemming from a common 4-fermion Lagrangian mediated by gluon (vector)-like exchange. The two-way interlinkage offered by MYTP between the 3D and 4D BSE forms via a Lorentz-covariant 3D support to the BS kernel, gives it a unique status which distinguishes it from most other 3D approaches to strong interaction dynamics, which give at most a one-way connection. Two specific types of MYTP which provide 3D support to the BSE kernel, are considered: a) Covariant Instantaneity Ansatz (CIA); b) Covariant LF/NP ansatz (Cov.LF). Both lead to formaly identical 3D BSE reductions (thus ensuring common spectral predictions), but their 4D manifestations differ sharply: Under CIA, the 4D loop integrals suffer from Lorentz mismatch of the vertex functions, leading to ill-defined time-like momentum integrals, but Cov LF is free from this disease. Some practical uses of MYTP as a basis for evaluating various types of 4D loop integrals are outlined. PACS: 11.10 st ; 12.38 Lg ; 13.40.Fn Keywords: Tamm-Dancoff, Bethe-Salpeter, Quasi-potentials, Light-front (LF), Markov-Yukawa, 3D-4D Interlinkage, CIA, Cov-LF, Spectroscopy. |
hep-ph/9904210 | Steve King | S. F. King | Atmospheric and Solar Neutrinos from Single Right-Handed Neutrino
Dominance and U(1) Family Symmetry | 30 latex pages. Final version to appear in Nucl.Phys.B | Nucl.Phys.B562:57-77,1999 | 10.1016/S0550-3213(99)00542-8 | null | hep-ph | null | We argue that in order to provide a natural explanation of both neutrino mass
hierarchies and large neutrino mixing angles, as required by the atmospheric
neutrino data, a single right-handed neutrino must give the dominant
contribution to the 23 block of the light effective neutrino matrix, and
illustrate this mechanism in the framework of models with U(1) family
symmetries. Sub-dominant contributions from other right-handed neutrinos are
required to give small mass splittings appropriate to the small angle MSW
solution to the solar neutrino problem. We give general conditions for
achieving this in the framework of U(1) family symmetry models containing
arbitrary numbers of right-handed neutrinos, and show how the resulting
neutrino mass hierarchies and mixing angles may be expanded in terms of the
Wolfenstein parameter.
| [
{
"created": "Thu, 1 Apr 1999 19:47:17 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Apr 1999 11:44:22 GMT",
"version": "v2"
},
{
"created": "Fri, 16 Apr 1999 16:53:13 GMT",
"version": "v3"
},
{
"created": "Thu, 26 Aug 1999 15:57:47 GMT",
"version": "v4"
}
] | 2014-11-17 | [
[
"King",
"S. F.",
""
]
] | We argue that in order to provide a natural explanation of both neutrino mass hierarchies and large neutrino mixing angles, as required by the atmospheric neutrino data, a single right-handed neutrino must give the dominant contribution to the 23 block of the light effective neutrino matrix, and illustrate this mechanism in the framework of models with U(1) family symmetries. Sub-dominant contributions from other right-handed neutrinos are required to give small mass splittings appropriate to the small angle MSW solution to the solar neutrino problem. We give general conditions for achieving this in the framework of U(1) family symmetry models containing arbitrary numbers of right-handed neutrinos, and show how the resulting neutrino mass hierarchies and mixing angles may be expanded in terms of the Wolfenstein parameter. |
1310.6982 | Alessandro Strumia | Alberto Salvio, Alessandro Strumia, Wei Xue | Thermal axion production | 16 pages, 5 figures. v3: we thank Daniel Green and Benjamin Wallisch
for having pointed out a numerical error in the electroweak gauge
contribution in fig. 5, which has been corrected | null | 10.1088/1475-7516/2014/01/011 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We reconsider thermal production of axions in the early universe, including
axion couplings to all Standard Model (SM) particles. Concerning the axion
coupling to gluons, we find that thermal effects enhance the axion production
rate by a factor of few with respect to previous computations performed in the
limit of small strong gauge coupling. Furthermore, we find that the top Yukawa
coupling induces a much larger axion production rate, unless the axion couples
to SM particles only via anomalies.
| [
{
"created": "Fri, 25 Oct 2013 17:23:11 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Dec 2013 21:21:31 GMT",
"version": "v2"
},
{
"created": "Mon, 2 May 2016 10:01:18 GMT",
"version": "v3"
}
] | 2016-05-03 | [
[
"Salvio",
"Alberto",
""
],
[
"Strumia",
"Alessandro",
""
],
[
"Xue",
"Wei",
""
]
] | We reconsider thermal production of axions in the early universe, including axion couplings to all Standard Model (SM) particles. Concerning the axion coupling to gluons, we find that thermal effects enhance the axion production rate by a factor of few with respect to previous computations performed in the limit of small strong gauge coupling. Furthermore, we find that the top Yukawa coupling induces a much larger axion production rate, unless the axion couples to SM particles only via anomalies. |
1410.6282 | Valentina Sadovnikova | E. G. Drukarev, M. G. Ryskin, V. A. Sadovnikova | On the loop approximation in nucleon QCD sum rules | 11 pages, 3 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | There was a general believe that the nucleon QCD sum rules which include only
the quark loops and thus contain only the condensates of dimension d=3 and d=4
have only a trivial solution. We demonstrate that there is also a nontrivial
solution. We show that it can be treated as the lowest order approximation to
the solution which includes the higher terms of the Operator Product Expansion.
Inclusion of the radiative corrections improves the convergence of the series.
| [
{
"created": "Thu, 23 Oct 2014 08:11:47 GMT",
"version": "v1"
}
] | 2014-10-24 | [
[
"Drukarev",
"E. G.",
""
],
[
"Ryskin",
"M. G.",
""
],
[
"Sadovnikova",
"V. A.",
""
]
] | There was a general believe that the nucleon QCD sum rules which include only the quark loops and thus contain only the condensates of dimension d=3 and d=4 have only a trivial solution. We demonstrate that there is also a nontrivial solution. We show that it can be treated as the lowest order approximation to the solution which includes the higher terms of the Operator Product Expansion. Inclusion of the radiative corrections improves the convergence of the series. |
1511.06002 | Sven Heinemeyer | S. Heinemeyer, C. Schappacher | Neutral Higgs Boson Production at e+e- Colliders in the Complex MSSM: A
Full One-Loop Analysis | 34 pages, 16 figures. arXiv admin note: text overlap with
arXiv:1503.02996, arXiv:1410.2787 | null | 10.1140/epjc/s10052-016-4038-4 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For the search for additional Higgs bosons in the Minimal Supersymmetric
Standard Model (MSSM) as well as for future precision analyses in the Higgs
sector a precise knowledge of their production properties is mandatory. We
evaluate the cross sections for the neutral Higgs boson production at e^+e^-
colliders in the MSSM with complex parameters (cMSSM). The evaluation is based
on a full one-loop calculation of the production channels e^+e^- -> h_i Z, h_i
gamma, h_i h_j (i,j = 1,2,3), including soft and hard QED radiation. The
dependence of the Higgs boson production cross sections on the relevant cMSSM
parameters is analyzed numerically. We find sizable contributions to many cross
sections. They are, depending on the production channel, roughly of 10-20% of
the tree-level results, but can go up to 50% or higher. The full one-loop
contributions are important for a future linear e^+e^- collider such as the ILC
or CLIC. There are plans to implement the evaluation of the Higgs boson
production cross sections into the code FeynHiggs.
| [
{
"created": "Wed, 18 Nov 2015 22:17:12 GMT",
"version": "v1"
}
] | 2016-05-25 | [
[
"Heinemeyer",
"S.",
""
],
[
"Schappacher",
"C.",
""
]
] | For the search for additional Higgs bosons in the Minimal Supersymmetric Standard Model (MSSM) as well as for future precision analyses in the Higgs sector a precise knowledge of their production properties is mandatory. We evaluate the cross sections for the neutral Higgs boson production at e^+e^- colliders in the MSSM with complex parameters (cMSSM). The evaluation is based on a full one-loop calculation of the production channels e^+e^- -> h_i Z, h_i gamma, h_i h_j (i,j = 1,2,3), including soft and hard QED radiation. The dependence of the Higgs boson production cross sections on the relevant cMSSM parameters is analyzed numerically. We find sizable contributions to many cross sections. They are, depending on the production channel, roughly of 10-20% of the tree-level results, but can go up to 50% or higher. The full one-loop contributions are important for a future linear e^+e^- collider such as the ILC or CLIC. There are plans to implement the evaluation of the Higgs boson production cross sections into the code FeynHiggs. |
2212.00493 | Juan M. Torres-Rincon | Juan M. Torres-Rincon | Transport coefficients of heavy mesons in a thermal medium | 6 pages, 4 figures. Contribution to the proceedings of ICHEP 2022
conference, see https://www.ichep2022.it/ | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have investigated the many-body equations of $D$ and $\bar{B}$ mesons in a
thermal medium by applying an effective field theory based on chiral and
heavy-quark symmetries. Exploiting these symmetries within kinetic theory, we
have derived an off-shell Fokker-Planck equation which incorporates information
of the full spectral functions of these states. In this contribution we present
our latest results on heavy-flavor transport coefficients below the chiral
restoration temperature, in both charm and bottom sectors. The calculation
incorporating temperature-dependent spectral functions and interactions,
together with off-shell effects, allows for an improved matching to the
state-of-the-art calculations above the chiral transition temperature.
| [
{
"created": "Thu, 1 Dec 2022 13:43:09 GMT",
"version": "v1"
}
] | 2022-12-02 | [
[
"Torres-Rincon",
"Juan M.",
""
]
] | We have investigated the many-body equations of $D$ and $\bar{B}$ mesons in a thermal medium by applying an effective field theory based on chiral and heavy-quark symmetries. Exploiting these symmetries within kinetic theory, we have derived an off-shell Fokker-Planck equation which incorporates information of the full spectral functions of these states. In this contribution we present our latest results on heavy-flavor transport coefficients below the chiral restoration temperature, in both charm and bottom sectors. The calculation incorporating temperature-dependent spectral functions and interactions, together with off-shell effects, allows for an improved matching to the state-of-the-art calculations above the chiral transition temperature. |
hep-ph/9809386 | Du Dong-Sheng | Youshan Dai, Dongsheng Du | CP Violation in Two-Body Hadronic Decays of $B_c$ Meson | 19 pages, 3 figures, corrected some typos and sentences | Eur.Phys.J.C9:557-564,1999 | 10.1007/s100529900073 | null | hep-ph | null | Using the next-to-leading order low energy effective Hamiltonian, the CP
asymmetries for the $B_{c}$ meson decays into meson pair are calculated in the
spectator approximation. We do not compute the hadronic matrix elements
directly, instead, we use the amplitude ratios to estimate the CP asymmetries.
This is quite,different from the previous works in the literature. The values
of the momentum squared carried by the virtual particles in timelike penguin
dirgrams are also carefully discussed. From our calculated results, the best
decay modes to observe CP violation in $B_{c}$ decays would be $B_{c}^-\to{\bar
D}^{*0}K^{*-}$, ${\bar D}^{0}K^{*-}$, ${\bar D}^{*0} K^{-}$, ${\bar
D}^{0}K^{-}$ and $B_{c}^-\to{\eta}_{c}D^{-}$, which need about $10^8$ of
$B_{c}^{\pm}$ events in experiment.
| [
{
"created": "Tue, 15 Sep 1998 03:34:47 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Dec 1998 06:56:06 GMT",
"version": "v2"
}
] | 2011-09-13 | [
[
"Dai",
"Youshan",
""
],
[
"Du",
"Dongsheng",
""
]
] | Using the next-to-leading order low energy effective Hamiltonian, the CP asymmetries for the $B_{c}$ meson decays into meson pair are calculated in the spectator approximation. We do not compute the hadronic matrix elements directly, instead, we use the amplitude ratios to estimate the CP asymmetries. This is quite,different from the previous works in the literature. The values of the momentum squared carried by the virtual particles in timelike penguin dirgrams are also carefully discussed. From our calculated results, the best decay modes to observe CP violation in $B_{c}$ decays would be $B_{c}^-\to{\bar D}^{*0}K^{*-}$, ${\bar D}^{0}K^{*-}$, ${\bar D}^{*0} K^{-}$, ${\bar D}^{0}K^{-}$ and $B_{c}^-\to{\eta}_{c}D^{-}$, which need about $10^8$ of $B_{c}^{\pm}$ events in experiment. |
2312.04977 | Hongxia Huang | Ye Yan, Hongxia Huang, Xinmei Zhu and Jialun Ping | Prediction of $P_{cc}$ states in quark model | 13 pages, 6 figures. arXiv admin note: text overlap with
arXiv:2309.15380 | null | null | null | hep-ph hep-ex nucl-th | http://creativecommons.org/licenses/by/4.0/ | Inspired by the observation of hidden-charm pentaquark $P_c$ and $P_{cs}$
states by the LHCb Collaboration, we explore the $qqc\bar{c}c$ ($q~=~u$ or $d$)
pentaquark systems in the quark delocalization color screening model. The
interaction between baryons and mesons and the influence of channel coupling
are studied in this work. Three compact $qqc\bar{c}c$ pentaquark states are
obtained, whose masses are 5259 MeV with $I(J^P)$ = $0(1/2^-)$, 5396 MeV with
$I(J^P)$ = $1(1/2^-)$, and 5465 MeV with $I(J^P)$ = $1(3/2^-)$. Two molecular
states are obtained, which are $I(J^P)$ = $0(1/2^-)$ $\Lambda_c J/\psi$ with
5367 MeV and $I(J^P)$ = $0(5/2^-)$ $\Xi_{cc}^* \bar{D}^*$ with 5690 MeV. These
predicted states may provide important information for future experimental
search.
| [
{
"created": "Fri, 8 Dec 2023 11:19:06 GMT",
"version": "v1"
}
] | 2023-12-11 | [
[
"Yan",
"Ye",
""
],
[
"Huang",
"Hongxia",
""
],
[
"Zhu",
"Xinmei",
""
],
[
"Ping",
"Jialun",
""
]
] | Inspired by the observation of hidden-charm pentaquark $P_c$ and $P_{cs}$ states by the LHCb Collaboration, we explore the $qqc\bar{c}c$ ($q~=~u$ or $d$) pentaquark systems in the quark delocalization color screening model. The interaction between baryons and mesons and the influence of channel coupling are studied in this work. Three compact $qqc\bar{c}c$ pentaquark states are obtained, whose masses are 5259 MeV with $I(J^P)$ = $0(1/2^-)$, 5396 MeV with $I(J^P)$ = $1(1/2^-)$, and 5465 MeV with $I(J^P)$ = $1(3/2^-)$. Two molecular states are obtained, which are $I(J^P)$ = $0(1/2^-)$ $\Lambda_c J/\psi$ with 5367 MeV and $I(J^P)$ = $0(5/2^-)$ $\Xi_{cc}^* \bar{D}^*$ with 5690 MeV. These predicted states may provide important information for future experimental search. |
1810.12525 | Zhen Fang | Zhen Fang, Yue-Liang Wu, Lin Zhang | Chiral phase transition and QCD phase diagram from AdS/QCD | null | Phys. Rev. D 99, 034028 (2019) | 10.1103/PhysRevD.99.034028 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the chemical potential effects on the chiral phase transition in a
simply improved soft-wall AdS/QCD model, which can realize consistently the
properties of linear confinement and spontaneous chiral symmetry breaking. The
$\mu-T$ phase diagrams with both zero and physical quark masses have been
obtained from this model. For the case of physical quark mass, the chiral
transition has a crossover behavior at low chemical potential. With the
increase of the chemical potential $\mu$, the critical temperature $T_c$
descends towards zero, and the crossover transition turns into a first-order
one at some intermediate value of $\mu$, which implies that a critical end
point naturally exists in this improved soft-wall model. All these features
agree with our current perspective on the QCD phase diagram.
| [
{
"created": "Tue, 30 Oct 2018 04:40:37 GMT",
"version": "v1"
}
] | 2019-03-06 | [
[
"Fang",
"Zhen",
""
],
[
"Wu",
"Yue-Liang",
""
],
[
"Zhang",
"Lin",
""
]
] | We study the chemical potential effects on the chiral phase transition in a simply improved soft-wall AdS/QCD model, which can realize consistently the properties of linear confinement and spontaneous chiral symmetry breaking. The $\mu-T$ phase diagrams with both zero and physical quark masses have been obtained from this model. For the case of physical quark mass, the chiral transition has a crossover behavior at low chemical potential. With the increase of the chemical potential $\mu$, the critical temperature $T_c$ descends towards zero, and the crossover transition turns into a first-order one at some intermediate value of $\mu$, which implies that a critical end point naturally exists in this improved soft-wall model. All these features agree with our current perspective on the QCD phase diagram. |
1208.3244 | Qiaoli Yang | H. Tam and Q. Yang | Detecting Sub-eV Scale Physics by Interferometry | 4 pages, no figures. Contributed to the 8th Patras Workshop on
Axions, WIMPs and WISPs, Chicago, July 18-22, 2012; A summary of authors'
previous paper: arXiv:1107.1712 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a new interferometry-based experiment to detect sub-eV scale
particles such as axion-like particles (ALPs).
| [
{
"created": "Wed, 15 Aug 2012 23:01:28 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Aug 2012 20:41:49 GMT",
"version": "v2"
},
{
"created": "Wed, 12 Dec 2012 07:49:48 GMT",
"version": "v3"
}
] | 2012-12-13 | [
[
"Tam",
"H.",
""
],
[
"Yang",
"Q.",
""
]
] | We propose a new interferometry-based experiment to detect sub-eV scale particles such as axion-like particles (ALPs). |
2112.09103 | Santiago Tanco | Anibal D. Medina, Nicol\'as I. Mileo, Alejandro Szynkman, Santiago A.
Tanco | The Elusive Muonic WIMP | 26 pages, 7 figures; Published version | Phys. Rev. D 106, 075018 (2022) | 10.1103/PhysRevD.106.075018 | null | hep-ph astro-ph.HE hep-ex | http://creativecommons.org/licenses/by/4.0/ | The Weakly Interacting Massive Particle (WIMP) paradigm is one of the most
popular scenarios for Dark Matter (DM) theories that however is strongly
constrained, in particular by direct detection experiments. We stick with the
WIMP hypothesis and consider a Dirac fermion candidate for DM that interacts
with the Standard Model (SM) via a spin-1 $Z'$, arising from the spontaneous
breaking of an Abelian $U(1)'_{\mu}$ gauge symmetry, under which only second
generation leptons and the DM are appropriately charged. Due to the charge
assignment, the model is gauge anomalous and can only be interpreted as an
effective field theory (EFT) at low energy. The $Z'$ couples at tree level only
to the vector DM current, to the axial muon current and to left-handed muonic
neutrinos, so the WIMP-nucleon cross section is beyond the experimental reach
of spin-independent (SI) direct detection searches. We study the current bounds
on this model coming from direct and indirect detection of DM, collider
searches, contributions to $(g-2)_{\mu}$ and to neutrino trident production. We
find that large regions of the parameter space remains to be explored. In the
context of LHC searches, we study the impact of a muon-exclusive signal region
for the $3\mu$ + ${E}^{{\rm miss}}_T$ channel with an invariant mass window
around $m_{Z'}$. We show that this search can significantly improve the current
collider bounds. Finally, from the anomalous nature of our EFT, there remain at
low energy triboson anomalous interactions between the $Z'$ and the electroweak
(EW) SM gauge bosons. We explore the possibilities of probing these
interactions at the LHC and at a 100 TeV proton collider finding it extremely
challenging. On the other hand, for a muon collider the resonant channel
$\mu^{+}\mu^{-}\to Z'\to ZZ$ could be discovered in the most promising scenario
with luminosity of $\mathcal{O}({\rm few}\; 10)$ ${\rm fb}^{-1}$.
| [
{
"created": "Thu, 16 Dec 2021 18:36:53 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Oct 2022 16:37:07 GMT",
"version": "v2"
}
] | 2022-10-24 | [
[
"Medina",
"Anibal D.",
""
],
[
"Mileo",
"Nicolás I.",
""
],
[
"Szynkman",
"Alejandro",
""
],
[
"Tanco",
"Santiago A.",
""
]
] | The Weakly Interacting Massive Particle (WIMP) paradigm is one of the most popular scenarios for Dark Matter (DM) theories that however is strongly constrained, in particular by direct detection experiments. We stick with the WIMP hypothesis and consider a Dirac fermion candidate for DM that interacts with the Standard Model (SM) via a spin-1 $Z'$, arising from the spontaneous breaking of an Abelian $U(1)'_{\mu}$ gauge symmetry, under which only second generation leptons and the DM are appropriately charged. Due to the charge assignment, the model is gauge anomalous and can only be interpreted as an effective field theory (EFT) at low energy. The $Z'$ couples at tree level only to the vector DM current, to the axial muon current and to left-handed muonic neutrinos, so the WIMP-nucleon cross section is beyond the experimental reach of spin-independent (SI) direct detection searches. We study the current bounds on this model coming from direct and indirect detection of DM, collider searches, contributions to $(g-2)_{\mu}$ and to neutrino trident production. We find that large regions of the parameter space remains to be explored. In the context of LHC searches, we study the impact of a muon-exclusive signal region for the $3\mu$ + ${E}^{{\rm miss}}_T$ channel with an invariant mass window around $m_{Z'}$. We show that this search can significantly improve the current collider bounds. Finally, from the anomalous nature of our EFT, there remain at low energy triboson anomalous interactions between the $Z'$ and the electroweak (EW) SM gauge bosons. We explore the possibilities of probing these interactions at the LHC and at a 100 TeV proton collider finding it extremely challenging. On the other hand, for a muon collider the resonant channel $\mu^{+}\mu^{-}\to Z'\to ZZ$ could be discovered in the most promising scenario with luminosity of $\mathcal{O}({\rm few}\; 10)$ ${\rm fb}^{-1}$. |
1608.00336 | Kazuya Mameda | Shu Ebihara, Kenji Fukushima, Kazuya Mameda | Boundary effects and gapped dispersion in rotating fermionic matter | 6 pages, 1 figure | Phys. Lett. B764, 94 (2017) | 10.1016/j.physletb.2016.11.010 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the importance of boundary effects on fermionic matter in a
rotating frame. By explicit calculations at zero temperature we show that the
scalar condensate of fermion and anti-fermion cannot be modified by the
rotation once the boundary condition is properly implemented. The situation is
qualitatively changed at finite temperature and/or in the presence of a
sufficiently strong magnetic field that supersedes the boundary effects.
Therefore, to establish an interpretation of the rotation as an effective
chemical potential, it is crucial to consider further environmental effects
such as the finite temperature and magnetic field.
| [
{
"created": "Mon, 1 Aug 2016 07:05:13 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Aug 2016 17:43:00 GMT",
"version": "v2"
},
{
"created": "Sun, 13 Nov 2016 14:25:18 GMT",
"version": "v3"
}
] | 2016-11-23 | [
[
"Ebihara",
"Shu",
""
],
[
"Fukushima",
"Kenji",
""
],
[
"Mameda",
"Kazuya",
""
]
] | We discuss the importance of boundary effects on fermionic matter in a rotating frame. By explicit calculations at zero temperature we show that the scalar condensate of fermion and anti-fermion cannot be modified by the rotation once the boundary condition is properly implemented. The situation is qualitatively changed at finite temperature and/or in the presence of a sufficiently strong magnetic field that supersedes the boundary effects. Therefore, to establish an interpretation of the rotation as an effective chemical potential, it is crucial to consider further environmental effects such as the finite temperature and magnetic field. |
hep-ph/9504434 | Carl Schmidt | Carl R. Schmidt | Top Quark Production and Decay at Next-to-leading Order in $e^+e^-$
Annihilation | 44 pages, LaTex, 10 embedded postscript figures, tarred and uuencoded
in separate file | Phys.Rev. D54 (1996) 3250-3265 | 10.1103/PhysRevD.54.3250 | SCIPP 95/14 | hep-ph | null | We study the effects of QCD corrections to the process $e^+e^-\rightarrow
t\bar t+X\rightarrow b\ell^+\nu \bar b\ell^-\bar \nu+X$ above threshold. We
show how to treat consistently to ${\cal O}(\alpha_s)$ the gluon radiation in
both the production and the decay of the top quarks, while maintaining all
angular correlations in the event. At this order there is an ambiguity in the
event reconstruction whenever a real gluon occurs in the final state. We study
the effects of this ambiguity on the top mass and helicity angle distributions.
For a top mass of 175 GeV and collider energy of 400 GeV the gluon radiation is
emitted predominantly in the decay of the top quarks.
| [
{
"created": "Mon, 1 May 1995 03:49:38 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Schmidt",
"Carl R.",
""
]
] | We study the effects of QCD corrections to the process $e^+e^-\rightarrow t\bar t+X\rightarrow b\ell^+\nu \bar b\ell^-\bar \nu+X$ above threshold. We show how to treat consistently to ${\cal O}(\alpha_s)$ the gluon radiation in both the production and the decay of the top quarks, while maintaining all angular correlations in the event. At this order there is an ambiguity in the event reconstruction whenever a real gluon occurs in the final state. We study the effects of this ambiguity on the top mass and helicity angle distributions. For a top mass of 175 GeV and collider energy of 400 GeV the gluon radiation is emitted predominantly in the decay of the top quarks. |
hep-ph/9808350 | Heinrich Paes | H.V. Klapdor-Kleingrothaus, H. P\"as | New physics potential of double beta decay and dark matter search | Talk presented by H. Paes at the at the 6th Symp. on Particles,
Strings and Cosmology (PASCOS'98), Boston, March 1998; 11 pages, 5 figures
included, needs sprocl.sty | null | null | null | hep-ph | null | The search for neutrinoless double beta decay and WIMP dark matter has a
broad potential to test particle physics beyond the standard model. During the
last years, the analysis of various contributions to the double beta decay rate
by the Heidelberg group led, besides the most restrictive limit on the
effective Majorana neutrino mass, to bounds on left-right-symmetric models,
leptoquarks and supersymmetry. In a general framework bounds on arbitrary
lepton number violating theories can be derived. Using double beta technology
for direct dark matter detection, stringent limits on the spin-independent
WIMP--nucleon interaction have been obtained. These results deduced from the
Heidelberg-Moscow double beta decay experiment are reviewed. Also an outlook on
the future of double beta decay and dark matter search, the GENIUS proposal, is
given.
| [
{
"created": "Tue, 18 Aug 1998 15:33:45 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Klapdor-Kleingrothaus",
"H. V.",
""
],
[
"Päs",
"H.",
""
]
] | The search for neutrinoless double beta decay and WIMP dark matter has a broad potential to test particle physics beyond the standard model. During the last years, the analysis of various contributions to the double beta decay rate by the Heidelberg group led, besides the most restrictive limit on the effective Majorana neutrino mass, to bounds on left-right-symmetric models, leptoquarks and supersymmetry. In a general framework bounds on arbitrary lepton number violating theories can be derived. Using double beta technology for direct dark matter detection, stringent limits on the spin-independent WIMP--nucleon interaction have been obtained. These results deduced from the Heidelberg-Moscow double beta decay experiment are reviewed. Also an outlook on the future of double beta decay and dark matter search, the GENIUS proposal, is given. |
2203.01685 | Sanjin Beni\'c | Sanjin Beni\'c, Oscar Garcia-Montero, Anton Perkov | Isolated photon-hadron production in high energy $pp$ and $pA$
collisions at RHIC and LHC | minor corrections, matches the published version | null | 10.1103/PhysRevD.105.114052 | ZTF-EP-22-01 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We compute the isolated photon production in association with a charged
hadron at mid rapidity in $pp$ and $pA$ based on the Color Glass Condensate
(CGC) framework of high energy QCD where, for the first time, we incorporate
the Sudakov effect of soft gluon emissions. Our results are based on the
leading order $q g \to q \gamma$ channel in the CGC framework and confronted
with the recent data from RHIC and LHC concerning the angular distributions and
out-of-plane transverse momentum distributions. We find that, while the CGC
computation alone results in too narrow distributions, with the help of the
Sudakov effect, we can get a satisfactory description of the data. With this as
a benchmark, we provide predictions for the magnitude of the nuclear effect
brought by the phenomena of gluon saturation in the CGC.
| [
{
"created": "Thu, 3 Mar 2022 12:47:55 GMT",
"version": "v1"
},
{
"created": "Sun, 3 Jul 2022 02:34:36 GMT",
"version": "v2"
}
] | 2022-07-05 | [
[
"Benić",
"Sanjin",
""
],
[
"Garcia-Montero",
"Oscar",
""
],
[
"Perkov",
"Anton",
""
]
] | We compute the isolated photon production in association with a charged hadron at mid rapidity in $pp$ and $pA$ based on the Color Glass Condensate (CGC) framework of high energy QCD where, for the first time, we incorporate the Sudakov effect of soft gluon emissions. Our results are based on the leading order $q g \to q \gamma$ channel in the CGC framework and confronted with the recent data from RHIC and LHC concerning the angular distributions and out-of-plane transverse momentum distributions. We find that, while the CGC computation alone results in too narrow distributions, with the help of the Sudakov effect, we can get a satisfactory description of the data. With this as a benchmark, we provide predictions for the magnitude of the nuclear effect brought by the phenomena of gluon saturation in the CGC. |
1405.3831 | Xiang Liu | Li-Ping He, Dian-Yong Chen, Xiang Liu and Takayuki Matsuki | Prediction of a missing higher charmonium around 4.26 GeV in $J/\psi$
family | 5 pages, 5 figures and 1 table. More discussions added. Accepted by
Eur. Phys. J. C | Eur. Phys. J. C 74, 3208 (2014) | 10.1140/epjc/s10052-014-3208-5 | null | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Inspired by the similarity of mass gaps of $J/\psi$ and $\Upsilon$ families,
the prediction of missing higher charmonium with mass $4263$ MeV and very
narrow width is made. In addition, the properties of two charmonium-like
states, $X(3940)$ and $X(4160)$, and charmonium $\psi(4415)$ are discussed.
Here, $X(3940)$ as $\eta_c(3S)$ is established while the explanation of
$X(4160)$ to be $\eta_c(4S)$ is fully excluded and $\eta_c(4S)$ is typically a
very narrow state. These predictions can be accessible at BESIII, Belle and
BelleII in near future.
| [
{
"created": "Thu, 15 May 2014 13:02:18 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Nov 2014 12:53:22 GMT",
"version": "v2"
},
{
"created": "Wed, 10 Dec 2014 02:28:27 GMT",
"version": "v3"
}
] | 2014-12-11 | [
[
"He",
"Li-Ping",
""
],
[
"Chen",
"Dian-Yong",
""
],
[
"Liu",
"Xiang",
""
],
[
"Matsuki",
"Takayuki",
""
]
] | Inspired by the similarity of mass gaps of $J/\psi$ and $\Upsilon$ families, the prediction of missing higher charmonium with mass $4263$ MeV and very narrow width is made. In addition, the properties of two charmonium-like states, $X(3940)$ and $X(4160)$, and charmonium $\psi(4415)$ are discussed. Here, $X(3940)$ as $\eta_c(3S)$ is established while the explanation of $X(4160)$ to be $\eta_c(4S)$ is fully excluded and $\eta_c(4S)$ is typically a very narrow state. These predictions can be accessible at BESIII, Belle and BelleII in near future. |
0906.3789 | Pierpaolo Mastrolia | Pierpaolo Mastrolia | Unitarity-Cuts and Berry's Phase | 3 pages, 1 figure | Lett.Math.Phys.91:199-204,2010 | 10.1007/s11005-010-0370-z | CERN-PH-TH-2009-104 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Elaborating on the observation that two-particle unitarity-cuts of scattering
amplitudes can be computed by applying Stokes' Theorem, we relate the Optical
Theorem to the Berry Phase, showing how the imaginary part of arbitrary
one-loop Feynman amplitudes can be interpreted as the flux of a complex 2-form.
| [
{
"created": "Mon, 22 Jun 2009 18:59:35 GMT",
"version": "v1"
}
] | 2010-02-11 | [
[
"Mastrolia",
"Pierpaolo",
""
]
] | Elaborating on the observation that two-particle unitarity-cuts of scattering amplitudes can be computed by applying Stokes' Theorem, we relate the Optical Theorem to the Berry Phase, showing how the imaginary part of arbitrary one-loop Feynman amplitudes can be interpreted as the flux of a complex 2-form. |
1905.08190 | Oleksandr Sobol Dr. | O.O. Sobol | Electrical conductivity of hot Abelian plasma with scalar charge
carriers | 36 pages, 2 figures, 4 tables | Phys. Rev. D 100, 056012 (2019) | 10.1103/PhysRevD.100.056012 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the electrical conductivity of hot Abelian plasma containing scalar
charge carriers in the leading logarithmic order in coupling constant $\alpha$
using the Boltzmann kinetic equation. The leading contribution to the collision
integral is due to the M{\o}ller and Bhabha scattering of scalar particles with
a singular cross section in the region of small momentum transfer. Regularizing
this singularity by taking into account the hard thermal loop corrections to
the propagators of intermediate particles, we derive the second order
differential equation which determines the kinetic function. We solve this
equation numerically and also use a variational approach in order to find a
simple analytical formula for the conductivity. It has the standard parametric
dependence on the coupling constant $\sigma\approx 2.38\, T/(\alpha
\log\alpha^{-1})$ with the prefactor taking a somewhat lower value compared to
the fermionic case. Finally, we consider the general case of hot Abelian plasma
with an arbitrary number of scalar and fermionic particle species and derive
the simple analytical formula for its conductivity.
| [
{
"created": "Mon, 20 May 2019 16:06:32 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Sep 2019 16:00:10 GMT",
"version": "v2"
}
] | 2019-09-20 | [
[
"Sobol",
"O. O.",
""
]
] | We study the electrical conductivity of hot Abelian plasma containing scalar charge carriers in the leading logarithmic order in coupling constant $\alpha$ using the Boltzmann kinetic equation. The leading contribution to the collision integral is due to the M{\o}ller and Bhabha scattering of scalar particles with a singular cross section in the region of small momentum transfer. Regularizing this singularity by taking into account the hard thermal loop corrections to the propagators of intermediate particles, we derive the second order differential equation which determines the kinetic function. We solve this equation numerically and also use a variational approach in order to find a simple analytical formula for the conductivity. It has the standard parametric dependence on the coupling constant $\sigma\approx 2.38\, T/(\alpha \log\alpha^{-1})$ with the prefactor taking a somewhat lower value compared to the fermionic case. Finally, we consider the general case of hot Abelian plasma with an arbitrary number of scalar and fermionic particle species and derive the simple analytical formula for its conductivity. |
1903.06927 | Xin-Qiang Li | Quan-Yi Hu, Xin-Qiang Li, Ya-Dong Yang, and Min-Di Zheng | $B_{s(d)}-\bar{B}_{s(d)}$ Mixing and $B_s\to\mu^+\mu^-$ Decay in the
NMSSM with the Flavour Expansion Theorem | 48 pages, 7 figures, and 2 tables; More discussions and references
added, final version to be published in JHEP | null | 10.1007/JHEP06(2019)133 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, motivated by the observation that the Standard Model
predictions are now above the experimental data for the mass difference $\Delta
M_{s(d)}$, we perform a detailed study of $B_{s(d)}-\bar{B}_{s(d)}$ mixing and
$B_s\to\mu^+\mu^-$ decay in the $\mathbb{Z}_3$-invariant NMSSM with non-minimal
flavour violation, using the recently developed procedure based on the Flavour
Expansion Theorem, with which one can perform a purely algebraic mass-insertion
expansion of an amplitude written in the mass eigenstate basis without
performing any diagrammatic calculations in the interaction/flavour basis.
Specifically, we consider the finite orders of mass insertions for neutralinos
but the general orders for squarks and charginos, under two sets of assumptions
for the squark flavour structures (\textit{i.e.}, while the flavour-conserving
off-diagonal element $\delta_{33}^\text{LR}$ is kept in both of these two
sectors, only the flavour-violating off-diagonal elements
$\delta_{23}^\text{LL}$ and $\delta_{i3}^\text{RR}$ ($i=1,2$) are kept in the
\text{LL} and \text{RR} sectors, respectively). Our analytic results are then
expressed directly in terms of the initial Lagrangian parameters in the
interaction/flavour basis, making it easy to impose the experimental bounds on
them. It is found numerically that the NMSSM effects with the above two
assumptions for the squark flavour structures can accommodate the observed
deviation for $\Delta M_{s(d)}$, while complying with the experimental
constraints from the branching ratios of $B_s\to \mu^+ \mu^-$ and $B\to
X_s\gamma$ decays.
| [
{
"created": "Sat, 16 Mar 2019 14:08:09 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Jun 2019 01:07:44 GMT",
"version": "v2"
}
] | 2022-10-12 | [
[
"Hu",
"Quan-Yi",
""
],
[
"Li",
"Xin-Qiang",
""
],
[
"Yang",
"Ya-Dong",
""
],
[
"Zheng",
"Min-Di",
""
]
] | In this paper, motivated by the observation that the Standard Model predictions are now above the experimental data for the mass difference $\Delta M_{s(d)}$, we perform a detailed study of $B_{s(d)}-\bar{B}_{s(d)}$ mixing and $B_s\to\mu^+\mu^-$ decay in the $\mathbb{Z}_3$-invariant NMSSM with non-minimal flavour violation, using the recently developed procedure based on the Flavour Expansion Theorem, with which one can perform a purely algebraic mass-insertion expansion of an amplitude written in the mass eigenstate basis without performing any diagrammatic calculations in the interaction/flavour basis. Specifically, we consider the finite orders of mass insertions for neutralinos but the general orders for squarks and charginos, under two sets of assumptions for the squark flavour structures (\textit{i.e.}, while the flavour-conserving off-diagonal element $\delta_{33}^\text{LR}$ is kept in both of these two sectors, only the flavour-violating off-diagonal elements $\delta_{23}^\text{LL}$ and $\delta_{i3}^\text{RR}$ ($i=1,2$) are kept in the \text{LL} and \text{RR} sectors, respectively). Our analytic results are then expressed directly in terms of the initial Lagrangian parameters in the interaction/flavour basis, making it easy to impose the experimental bounds on them. It is found numerically that the NMSSM effects with the above two assumptions for the squark flavour structures can accommodate the observed deviation for $\Delta M_{s(d)}$, while complying with the experimental constraints from the branching ratios of $B_s\to \mu^+ \mu^-$ and $B\to X_s\gamma$ decays. |
hep-ph/0604243 | B. L. G. Bakker | A.M.Badalian (Institute of Theoretical and Experimental Physics,
Moscow, Russia.) B.L.G.Bakker (Department of Physics and Astronomy, Vrije
Universiteit, Amsterdam, The Netherlands) | Higher $\eta_c(nS)$ and $\eta_b (nS)$ mesons | 23 pages | null | 10.1134/S1063778807100134 | null | hep-ph | null | The hyperfine splittings in heavy quarkonia are studied in a
model-independent way using the experimental data on di-electron widths.
Relativistic correlations are taken into account together with the smearing of
the spin-spin interaction. The radius of smearing is fixed by the known
$J/\psi-\eta_c(1S)$ and $\psi(2S)-\eta'_c(2S)$ splittings and appears to be
small, $r_{ss} \cong 0.06$ fm. Nevertheless, even with such a small radius an
essential suppression of the hyperfine splittings ($\sim 50%)$ is observed in
bottomonium. For the $nS~ b\bar b$ states $(n=1,2,...,6)$ we predict the values
(in MeV) 28, 12, 10, 6, 6, and 3, respectively. For the $3S$ and $4S$
charmonium states the splittings 16(2) MeV and 12(4) MeV are obtained.
| [
{
"created": "Thu, 27 Apr 2006 14:46:46 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Badalian",
"A. M.",
"",
"Institute of Theoretical and Experimental Physics,\n Moscow, Russia."
],
[
"Bakker",
"B. L. G.",
"",
"Department of Physics and Astronomy, Vrije\n Universiteit, Amsterdam, The Netherlands"
]
] | The hyperfine splittings in heavy quarkonia are studied in a model-independent way using the experimental data on di-electron widths. Relativistic correlations are taken into account together with the smearing of the spin-spin interaction. The radius of smearing is fixed by the known $J/\psi-\eta_c(1S)$ and $\psi(2S)-\eta'_c(2S)$ splittings and appears to be small, $r_{ss} \cong 0.06$ fm. Nevertheless, even with such a small radius an essential suppression of the hyperfine splittings ($\sim 50%)$ is observed in bottomonium. For the $nS~ b\bar b$ states $(n=1,2,...,6)$ we predict the values (in MeV) 28, 12, 10, 6, 6, and 3, respectively. For the $3S$ and $4S$ charmonium states the splittings 16(2) MeV and 12(4) MeV are obtained. |
hep-ph/0610321 | Bjorn Garbrecht | Bjorn Garbrecht and Thomas Konstandin | Hybrid Inflation Exit through Tunneling | 17 pages, 2 figures | JHEP 0701:033,2007 | 10.1088/1126-6708/2007/01/033 | MAN/HEP/2006/29 | hep-ph | null | For hybrid inflationary potentials, we derive the tunneling rate from field
configurations along the flat direction towards the waterfall regime. This
process competes with the classically rolling evolution of the scalar fields
and needs to be strongly subdominant for phenomenologically viable models.
Tunneling may exclude models with a mass scale below 10^12 GeV, but can be
suppressed by small values of the coupling constants. We find that tunneling is
negligible for those models, which do not require fine tuning in order to
cancel radiative corrections, in particular for GUT-scale SUSY inflation. In
contrast, electroweak scale hybrid inflation is not viable, unless the
inflaton-waterfall field coupling is smaller than approximately 10^-11.
| [
{
"created": "Tue, 24 Oct 2006 18:44:30 GMT",
"version": "v1"
}
] | 2010-10-27 | [
[
"Garbrecht",
"Bjorn",
""
],
[
"Konstandin",
"Thomas",
""
]
] | For hybrid inflationary potentials, we derive the tunneling rate from field configurations along the flat direction towards the waterfall regime. This process competes with the classically rolling evolution of the scalar fields and needs to be strongly subdominant for phenomenologically viable models. Tunneling may exclude models with a mass scale below 10^12 GeV, but can be suppressed by small values of the coupling constants. We find that tunneling is negligible for those models, which do not require fine tuning in order to cancel radiative corrections, in particular for GUT-scale SUSY inflation. In contrast, electroweak scale hybrid inflation is not viable, unless the inflaton-waterfall field coupling is smaller than approximately 10^-11. |
2111.04514 | Hua-Xing Chen | Hua-Xing Chen, Wei Chen and Shi-Lin Zhu | New hadron configuration: The double-gluon hybrid state | 5 pages, 3 figures, 1 table, revised version to be published in PRD | Phys. Rev. D 105, L051501 (2022) | 10.1103/PhysRevD.105.L051501 | null | hep-ph hep-ex hep-lat nucl-ex nucl-th | http://creativecommons.org/licenses/by/4.0/ | This is the first study on the double-gluon hybrid, which consists of one
valence quark and one valence antiquark together with two valence gluons. We
concentrate on the one with the exotic quantum number $J^{PC} = 2^{+-}$ that
conventional $\bar q q$ mesons can not reach. We apply QCD sum rule method to
evaluate its mass to be $2.26^{+0.20}_{-0.25}$ GeV, and study its possible
decay patterns. Especially, its three-meson decay patterns are generally not
suppressed severely compared to two-meson decay patterns, so the $S$-wave
three-meson decay channels $f_1\omega\pi/f_1\rho\pi$ can be useful in
identifying its nature, which is of particular importance to the direct test of
QCD in the low energy sector.
| [
{
"created": "Mon, 8 Nov 2021 13:57:18 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Nov 2021 09:51:31 GMT",
"version": "v2"
},
{
"created": "Fri, 4 Mar 2022 01:08:46 GMT",
"version": "v3"
}
] | 2022-03-07 | [
[
"Chen",
"Hua-Xing",
""
],
[
"Chen",
"Wei",
""
],
[
"Zhu",
"Shi-Lin",
""
]
] | This is the first study on the double-gluon hybrid, which consists of one valence quark and one valence antiquark together with two valence gluons. We concentrate on the one with the exotic quantum number $J^{PC} = 2^{+-}$ that conventional $\bar q q$ mesons can not reach. We apply QCD sum rule method to evaluate its mass to be $2.26^{+0.20}_{-0.25}$ GeV, and study its possible decay patterns. Especially, its three-meson decay patterns are generally not suppressed severely compared to two-meson decay patterns, so the $S$-wave three-meson decay channels $f_1\omega\pi/f_1\rho\pi$ can be useful in identifying its nature, which is of particular importance to the direct test of QCD in the low energy sector. |
hep-ph/9404337 | Hiroyuki Siomi | H. Shiomi and T. Hatsuda | Vector Mesons in Nuclear Medium -- an Effective Lagrangian Approach -- | LaTeX 9 pages, 3 figures are available on request, report UTHEP-276 | Phys.Lett. B334 (1994) 281-286 | 10.1016/0370-2693(94)90688-2 | null | hep-ph nucl-th | null | Effective masses of $\rho$ and $\omega$ mesons in nuclear medium are studied
in a hadronic effective theory. Both the pole position and the screening mass
decrease in nuclear matter due to the polarization of the nucleon Dirac sea.
The physical origin of the decrease is a reduction of the wave function
renormalization constant induced by the tensor (vector) interaction of the
$\rho$ ($\omega$) with the nucleon. Relation to the results of the QCD sum
rules is also discussed.
| [
{
"created": "Tue, 26 Apr 1994 06:02:02 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Shiomi",
"H.",
""
],
[
"Hatsuda",
"T.",
""
]
] | Effective masses of $\rho$ and $\omega$ mesons in nuclear medium are studied in a hadronic effective theory. Both the pole position and the screening mass decrease in nuclear matter due to the polarization of the nucleon Dirac sea. The physical origin of the decrease is a reduction of the wave function renormalization constant induced by the tensor (vector) interaction of the $\rho$ ($\omega$) with the nucleon. Relation to the results of the QCD sum rules is also discussed. |
0806.3140 | Qiang Zhao | Yuan-Jiang Zhang, Qiang Zhao, and Cong-Feng Qiao | Possible contributions to $e^+e^- \to J/\psi + \eta_c$ due to
intermediate meson rescatterings | revised version to appear in Phys. Rev. D | Phys.Rev.D78:054014,2008 | 10.1103/PhysRevD.78.054014 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Inspired by the obvious discrepancies between experiment and non-relativistic
QCD (NRQCD) studies of $e^+ e^-\to J/\psi+\eta_c$ at $\sqrt{s}\simeq 10.6$ GeV,
we investigate contributions from intermediate meson loops as long-range
interaction transitions to this process. The intermediate meson loops include
$D\bar D(\bar D^\ast)$, $D\bar D^\ast(D {or} D^\ast)$, $D^\ast \bar D^\ast(D)$
and corresponding $D_s$ intermediate mesons. With the constraints from
experimental data on the vertex couplings, we find that the intermediate meson
loops account for $2.7\sim 6.7 fb$ of the cross sections within a reasonable
range of cut-off energies of the factor parameter. We also investigate
contributions from the absorptive part and find that it accounts for
approximately $0.58\sim 1.38 fb$. These results imply that contributions from
long-range interaction transitions may still play a role in such an energy
region.
| [
{
"created": "Thu, 19 Jun 2008 07:13:52 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Jun 2008 07:11:03 GMT",
"version": "v2"
},
{
"created": "Wed, 27 Aug 2008 02:26:26 GMT",
"version": "v3"
}
] | 2009-01-09 | [
[
"Zhang",
"Yuan-Jiang",
""
],
[
"Zhao",
"Qiang",
""
],
[
"Qiao",
"Cong-Feng",
""
]
] | Inspired by the obvious discrepancies between experiment and non-relativistic QCD (NRQCD) studies of $e^+ e^-\to J/\psi+\eta_c$ at $\sqrt{s}\simeq 10.6$ GeV, we investigate contributions from intermediate meson loops as long-range interaction transitions to this process. The intermediate meson loops include $D\bar D(\bar D^\ast)$, $D\bar D^\ast(D {or} D^\ast)$, $D^\ast \bar D^\ast(D)$ and corresponding $D_s$ intermediate mesons. With the constraints from experimental data on the vertex couplings, we find that the intermediate meson loops account for $2.7\sim 6.7 fb$ of the cross sections within a reasonable range of cut-off energies of the factor parameter. We also investigate contributions from the absorptive part and find that it accounts for approximately $0.58\sim 1.38 fb$. These results imply that contributions from long-range interaction transitions may still play a role in such an energy region. |
1510.02797 | Marek Lewicki | Zygmunt Lalak, Marek Lewicki and Pawe{\l} Olszewski | Standard Model vacuum stability in the presence of gauge invariant
nonrenormalizable operators | Talk given at 18th International Conference `From the Planck Scale to
the Electroweak Scale', 25-29 May 2015, Ioannina, Greece | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Analysis of the Standard Model effective potential can reveal certain
properties of the UV completion of SM. We discuss the issue of stability of the
SM potential after inclusion of new nonrenormalizable interactions. We present
the map of lifetimes resulting from different configurations of the new
operators. The key result is proof of gauge independence of our results after
inclusion of nonrenormalizable operators. We also discuss the consequences of
RGE improvement of the potential.
| [
{
"created": "Fri, 9 Oct 2015 20:03:41 GMT",
"version": "v1"
}
] | 2015-10-13 | [
[
"Lalak",
"Zygmunt",
""
],
[
"Lewicki",
"Marek",
""
],
[
"Olszewski",
"Paweł",
""
]
] | Analysis of the Standard Model effective potential can reveal certain properties of the UV completion of SM. We discuss the issue of stability of the SM potential after inclusion of new nonrenormalizable interactions. We present the map of lifetimes resulting from different configurations of the new operators. The key result is proof of gauge independence of our results after inclusion of nonrenormalizable operators. We also discuss the consequences of RGE improvement of the potential. |
0910.5237 | Hai-Yang Cheng | Hai-Yang Cheng, Chun-Khiang Chua | QCD Factorization for Charmless Hadronic B_s Decays Revisited | 38 pages | Phys.Rev.D80:114026,2009 | 10.1103/PhysRevD.80.114026 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Branching fractions and CP-violating asymmetries of charmless $\bar B_s\to
PP, VP, VV$ decays (P and V denoting pseudoscalar and vector mesons,
respectively) are re-examined in the framework of QCD factorization (QCDF). We
take into account subleading power corrections to the penguin annihilation
topology and to color-suppressed tree amplitudes that are crucial for resolving
the CP puzzles and rate deficit problems with penguin-dominated two-body decays
and color-suppressed tree-dominated $\pi^0\pi^0$ and $\rho^0\pi^0$ modes in the
$B_{u,d}$ sector. Many of the $B_s\to h_1h_2$ decays can be related to $B_d\to
h_1h_2$ ones via U-spin or SU(3) symmetry. Some useful model-independent
relations can be derived and tested. Mixing-induced CP asymmetries for many of
the penguin-dominated decays are predicted to be very small in the standard
model. They are sensitive to New Physics and offer rich possibilities of new
discoveries. Measurements of direct CP-violating asymmetries can be used to
discriminate QCDF from other competing approaches such as pQCD and
soft-collinear effective theory.
| [
{
"created": "Tue, 27 Oct 2009 20:38:30 GMT",
"version": "v1"
}
] | 2010-01-07 | [
[
"Cheng",
"Hai-Yang",
""
],
[
"Chua",
"Chun-Khiang",
""
]
] | Branching fractions and CP-violating asymmetries of charmless $\bar B_s\to PP, VP, VV$ decays (P and V denoting pseudoscalar and vector mesons, respectively) are re-examined in the framework of QCD factorization (QCDF). We take into account subleading power corrections to the penguin annihilation topology and to color-suppressed tree amplitudes that are crucial for resolving the CP puzzles and rate deficit problems with penguin-dominated two-body decays and color-suppressed tree-dominated $\pi^0\pi^0$ and $\rho^0\pi^0$ modes in the $B_{u,d}$ sector. Many of the $B_s\to h_1h_2$ decays can be related to $B_d\to h_1h_2$ ones via U-spin or SU(3) symmetry. Some useful model-independent relations can be derived and tested. Mixing-induced CP asymmetries for many of the penguin-dominated decays are predicted to be very small in the standard model. They are sensitive to New Physics and offer rich possibilities of new discoveries. Measurements of direct CP-violating asymmetries can be used to discriminate QCDF from other competing approaches such as pQCD and soft-collinear effective theory. |
1605.04402 | Teruyuki Kitabayashi | Teruyuki Kitabayashi and Masaki Yasu\`e | Maximal CP Violation in Minimal Seesaw Model | 9 pages, no figure,version accepted for publication in Physical
Review D | Phys. Rev. D 94, 075020 (2016) | 10.1103/PhysRevD.94.075020 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the minimal seesaw model, we derive required constraints on Dirac neutrino
masses inducing maximal CP violation in neutrino oscillations. If the maximal
atmospheric neutrino mixing is further assumed, Dirac neutrino masses are
uniquely determined to respect $\mu$-$\tau$ flavored CP symmetry for neutrinos.
| [
{
"created": "Sat, 14 May 2016 10:01:25 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Nov 2016 08:36:59 GMT",
"version": "v2"
}
] | 2016-11-18 | [
[
"Kitabayashi",
"Teruyuki",
""
],
[
"Yasuè",
"Masaki",
""
]
] | In the minimal seesaw model, we derive required constraints on Dirac neutrino masses inducing maximal CP violation in neutrino oscillations. If the maximal atmospheric neutrino mixing is further assumed, Dirac neutrino masses are uniquely determined to respect $\mu$-$\tau$ flavored CP symmetry for neutrinos. |
hep-ph/9606430 | Thomas Meissner | Thomas Meissner and Michael Frank | Low-Energy QCD: Chiral Coefficients, UA(1)-Breaking and the Quark-Quark
Interaction | Contributed Paper at PANIC 96, 2 pages, LATEX, uses sprocl.sty and
axodraw.sty | null | null | null | hep-ph | null | A detailed investigation of the low-energy chiral expansion is presented
within a model truncation of QCD. The model dependence of the chiral
coefficients is tested for several forms of the quark-quark interaction by
varying the form of the running coupling in the infrared region. Furthermore we
demonstrate how the UA(1)$ anomaly and a mass for the eta' can arise in this
approach.
| [
{
"created": "Tue, 25 Jun 1996 16:10:36 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Meissner",
"Thomas",
""
],
[
"Frank",
"Michael",
""
]
] | A detailed investigation of the low-energy chiral expansion is presented within a model truncation of QCD. The model dependence of the chiral coefficients is tested for several forms of the quark-quark interaction by varying the form of the running coupling in the infrared region. Furthermore we demonstrate how the UA(1)$ anomaly and a mass for the eta' can arise in this approach. |
hep-ph/0604097 | Boris Kopeliovich | B.Z. Kopeliovich, I.K. Potashnikova, Ivan Schmidt | Diffraction in QCD | Based on the lecture given by B.K. at I LAWHEP, Porto Alegre, Brazil,
December 1-3, 2005 | Braz.J.Phys.37:473-483,2007 | 10.1590/S0103-97332007000400002 | USM-TH 183 | hep-ph | null | This lecture presents a short review of the main features of diffractive
processes and QCD inspired models. It includes the following topics: (1)
Quantum mechanics of diffraction: general properties; (2) Color dipole
description of diffraction; (3) Color transparency; (4) Soft diffraction in
hard reactions: DIS, Drell-Yan, Higgs production; (5) Why Pomerons interact
weakly; (6) Small gluonic spots in the proton; (7) Diffraction near the
unitarity bound: the Goulianos-Schlein "puzzle"; (8) Diffraction on nuclei:
diffractive Color Glass; (9) CGC and gluon shadowing.
| [
{
"created": "Tue, 11 Apr 2006 17:27:53 GMT",
"version": "v1"
}
] | 2011-08-04 | [
[
"Kopeliovich",
"B. Z.",
""
],
[
"Potashnikova",
"I. K.",
""
],
[
"Schmidt",
"Ivan",
""
]
] | This lecture presents a short review of the main features of diffractive processes and QCD inspired models. It includes the following topics: (1) Quantum mechanics of diffraction: general properties; (2) Color dipole description of diffraction; (3) Color transparency; (4) Soft diffraction in hard reactions: DIS, Drell-Yan, Higgs production; (5) Why Pomerons interact weakly; (6) Small gluonic spots in the proton; (7) Diffraction near the unitarity bound: the Goulianos-Schlein "puzzle"; (8) Diffraction on nuclei: diffractive Color Glass; (9) CGC and gluon shadowing. |
0904.2646 | Fernand Renard M | M. Beccaria, F.M. Renard, C. Verzegnassi | A peculiar property of SUSY amplitudes at high energy | 23 pqges, 4 eps figures | Int.J.Mod.Phys.A24:6123-6140,2009 | 10.1142/S0217751X09047569 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We observe that the electroweak one loop correction to the quark+gluon to
quark+Higgs amplitude at high energy involves both single and quadratic
logarithms of the energy in the SM case but only quadratic logarithms in the
MSSM case. We explore the origin of this special SUSY cancellation, both in a
diagrammatic way and through the splitting+Parameter Renormalization procedure.
We show that it is not an accident but a remarkableand general SUSY property of
the renormalized Higgs-fermion-fermion and Higgsino-sfermion-fermion vertices
which directly reflects in such processes, for example in $bg\to tH^-$, $bg\to
bH^0$, $bg\to bh^0$, $bg\to bA^0$, and through equivalence in $bg\to
tW^-_{long}$, $bg\to bZ_{long}$, as well as in $bg\to \tilde{t}\chi^-$,
$bg\to\tilde{b}\chi^0$. This simplification of the high energy behaviour (which
only leaves quadratic logarithms involving pure gauge couplings without any
free parameter) allows to write simple relations among these various processes
which constitute genuine tests of the assumed SUSY model.
| [
{
"created": "Fri, 17 Apr 2009 07:22:03 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Sep 2009 10:08:05 GMT",
"version": "v2"
}
] | 2010-01-21 | [
[
"Beccaria",
"M.",
""
],
[
"Renard",
"F. M.",
""
],
[
"Verzegnassi",
"C.",
""
]
] | We observe that the electroweak one loop correction to the quark+gluon to quark+Higgs amplitude at high energy involves both single and quadratic logarithms of the energy in the SM case but only quadratic logarithms in the MSSM case. We explore the origin of this special SUSY cancellation, both in a diagrammatic way and through the splitting+Parameter Renormalization procedure. We show that it is not an accident but a remarkableand general SUSY property of the renormalized Higgs-fermion-fermion and Higgsino-sfermion-fermion vertices which directly reflects in such processes, for example in $bg\to tH^-$, $bg\to bH^0$, $bg\to bh^0$, $bg\to bA^0$, and through equivalence in $bg\to tW^-_{long}$, $bg\to bZ_{long}$, as well as in $bg\to \tilde{t}\chi^-$, $bg\to\tilde{b}\chi^0$. This simplification of the high energy behaviour (which only leaves quadratic logarithms involving pure gauge couplings without any free parameter) allows to write simple relations among these various processes which constitute genuine tests of the assumed SUSY model. |
0705.4357 | Bodo Geyer | B.Geyer and O. Witzel | Heavy Meson Distribution Amplitudes of Definite Geometric Twist with
Contribution of 3-Particle Distribution Amplitudes | 24 pages | Phys.Rev.D76:074022,2007 | 10.1103/PhysRevD.76.074022 | HU-EP-07/19, SFB/CPP-07-23 | hep-ph | null | Under the constraints of HQET the equations of motion of heavy meson
distribution amplitudes of definite geometric twist, using the knowledge of
their off-cone structure, are reformulated as a set of algebraic equations.
Together with equations due to various Dirac structures various relations
between the (sets of) independent two- and three particle distribution
amplitudes of definite geometric twist are derived and presented using both the
notion of (double) Mellin moments and re-summed non-local distribution
amplitudes. Resolving these relations for the independent two-particle moments
in terms of three-particle double moments we confirmed the representation of
$\Phi_{\pm|n}$ by Kawamura et al. (Phys. Lett. B \bf{523} (2001) 111).
| [
{
"created": "Wed, 30 May 2007 09:00:21 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Jul 2007 09:27:51 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Geyer",
"B.",
""
],
[
"Witzel",
"O.",
""
]
] | Under the constraints of HQET the equations of motion of heavy meson distribution amplitudes of definite geometric twist, using the knowledge of their off-cone structure, are reformulated as a set of algebraic equations. Together with equations due to various Dirac structures various relations between the (sets of) independent two- and three particle distribution amplitudes of definite geometric twist are derived and presented using both the notion of (double) Mellin moments and re-summed non-local distribution amplitudes. Resolving these relations for the independent two-particle moments in terms of three-particle double moments we confirmed the representation of $\Phi_{\pm|n}$ by Kawamura et al. (Phys. Lett. B \bf{523} (2001) 111). |
hep-ph/9707219 | Oleg Selugin | S.V. Goloskokov, S.P. Kuleshov, O.V. Selyugin | Elastic nucleon scattering at small angles at LHC energies | LaTex file, with 3 figs (file.ps) | null | null | null | hep-ph | null | Predictions of the elastic proton-proton cross sections at energies of LHC
are calculate on the base of the high energy dynamical model. The growth of
$ds/dt$ at fixed transfer momenta are shown. The form of eikonal of elastic
hadron scattering at super high energies is discussed.
| [
{
"created": "Wed, 2 Jul 1997 09:28:51 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Goloskokov",
"S. V.",
""
],
[
"Kuleshov",
"S. P.",
""
],
[
"Selyugin",
"O. V.",
""
]
] | Predictions of the elastic proton-proton cross sections at energies of LHC are calculate on the base of the high energy dynamical model. The growth of $ds/dt$ at fixed transfer momenta are shown. The form of eikonal of elastic hadron scattering at super high energies is discussed. |
hep-ph/0012180 | Gilberto Tavares Velasco | F. Larios, M.A. Perez, G. Tavares-Velasco and J.J. Toscano | Trilinear Neutral Gauge Boson Couplings in Effective Theories | 21 pages, 2 figures, RevTex formatted | Phys.Rev. D63 (2001) 113014 | 10.1103/PhysRevD.63.113014 | null | hep-ph | null | We list all the lowest dimension effective operators inducing off-shell
trilinear neutral gauge boson couplings Z-Z-Photon, Z-Photon-Photon, and ZZZ
within the effective Lagrangian approach, both in the linear and nonlinear
realizations of the SU(2)_{L} X U(1)_Y gauge symmetry. In the linear scenario
we find that these couplings can be generated only by dimension eight operators
necessarily including the Higgs boson field, whereas in the nonlinear case they
are induced by dimension six operators. We consider the impact of these
couplings on some precision measurements such as the magnetic and electric
dipole moments of fermions, as well as the Z boson rare decay Z ->
neutrino+antineutrino+ photon. If the underlying new physics is of a decoupling
nature, it is not expected that trilinear neutral gauge boson couplings may
affect considerably any of these observables. On the contrary, it is just in
the nonlinear scenario where these couplings have the more promising prospects
of being perceptible through high precision experiments.
| [
{
"created": "Thu, 14 Dec 2000 22:12:38 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Larios",
"F.",
""
],
[
"Perez",
"M. A.",
""
],
[
"Tavares-Velasco",
"G.",
""
],
[
"Toscano",
"J. J.",
""
]
] | We list all the lowest dimension effective operators inducing off-shell trilinear neutral gauge boson couplings Z-Z-Photon, Z-Photon-Photon, and ZZZ within the effective Lagrangian approach, both in the linear and nonlinear realizations of the SU(2)_{L} X U(1)_Y gauge symmetry. In the linear scenario we find that these couplings can be generated only by dimension eight operators necessarily including the Higgs boson field, whereas in the nonlinear case they are induced by dimension six operators. We consider the impact of these couplings on some precision measurements such as the magnetic and electric dipole moments of fermions, as well as the Z boson rare decay Z -> neutrino+antineutrino+ photon. If the underlying new physics is of a decoupling nature, it is not expected that trilinear neutral gauge boson couplings may affect considerably any of these observables. On the contrary, it is just in the nonlinear scenario where these couplings have the more promising prospects of being perceptible through high precision experiments. |
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