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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2005.02292 | Claudio Coriano | Claudio Corian\`o, Matteo Maria Maglio, Alessandro Tatullo,
Dimosthenis Theofilopoulos | Dark Matter with Light and Ultralight St\"uckelberg Axions | 29 pages, 3 figures, Proceedings of the Corfu Summer Institute 2019
"School and Workshops on Elementary Particle Physics and Gravity" 1-27
September 2019, Corfu, Greece | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Scenarios with axion-like particles of variable masses, from the milli-eV
range to ultralight, can be generated in a natural way in the context of
effective field theory models with anomalous $U(1)$ gauge symmetries. They
include dimension-5 operators which define a coupling of the axion to the gauge
anomaly. They provide a realization, in the domain of ordinary gauge theories,
of models for such particles, which evade the usual mass/coupling constraint of
ordinary (Peccei-Quinn) axions and are natural dark matter candidates. As an
illustration of these models, we present an overview of two of these scenarios.
One of them is built around the next-to-minimal MSSM (NMSSM), a model called
the USSM-A, which illustrates how the St\"uckelberg supermultiplet can be used
to generate two dark matter candidates, a neutralino containing an axino
component coming from the St\"uckelberg sector, plus the axion ($\textrm{Im}\,
b$). The real component of the complex St\"uckelberg field carries dilaton-like
($\textrm{Re}\, b\, FF$) interactions. In a second model, non-supersymmetric,
the St\"uckelberg scale is raised up to the GUT epoch. In this case the axion
mass can be ultralight ($\sim 10^{-20}$ eV). The periodic potential generated
at the GUT phase transition and the corresponding oscillations are related to a
particle whose De Broglie wavelength can be sub-galactic. A similar analysis is
also possible for the supersymmetric scenario.
| [
{
"created": "Tue, 5 May 2020 15:45:23 GMT",
"version": "v1"
}
] | 2020-05-06 | [
[
"Corianò",
"Claudio",
""
],
[
"Maglio",
"Matteo Maria",
""
],
[
"Tatullo",
"Alessandro",
""
],
[
"Theofilopoulos",
"Dimosthenis",
""
]
] | Scenarios with axion-like particles of variable masses, from the milli-eV range to ultralight, can be generated in a natural way in the context of effective field theory models with anomalous $U(1)$ gauge symmetries. They include dimension-5 operators which define a coupling of the axion to the gauge anomaly. They provide a realization, in the domain of ordinary gauge theories, of models for such particles, which evade the usual mass/coupling constraint of ordinary (Peccei-Quinn) axions and are natural dark matter candidates. As an illustration of these models, we present an overview of two of these scenarios. One of them is built around the next-to-minimal MSSM (NMSSM), a model called the USSM-A, which illustrates how the St\"uckelberg supermultiplet can be used to generate two dark matter candidates, a neutralino containing an axino component coming from the St\"uckelberg sector, plus the axion ($\textrm{Im}\, b$). The real component of the complex St\"uckelberg field carries dilaton-like ($\textrm{Re}\, b\, FF$) interactions. In a second model, non-supersymmetric, the St\"uckelberg scale is raised up to the GUT epoch. In this case the axion mass can be ultralight ($\sim 10^{-20}$ eV). The periodic potential generated at the GUT phase transition and the corresponding oscillations are related to a particle whose De Broglie wavelength can be sub-galactic. A similar analysis is also possible for the supersymmetric scenario. |
hep-ph/0303105 | Costas Papadopoulos | W. Beenakker, A.P. Chapovsky, A. Kanaki, C.G. Papadopoulos, R. Pittau | Towards an effective-action approach to fermion-loop corrections | 43 pages, 1 figure. Accepted for publication in Nuclear Physics B | Nucl.Phys. B667 (2003) 359-393 | 10.1016/S0550-3213(03)00545-5 | CERN-TH/2003-052 | hep-ph | null | We present a study of the effective action approach to incorporate
higher-order effects in e^+e^- -> n fermions. In its minimal version, the
effective action approach is found to exhibit problems with unitarity and
high-energy behaviour. We identify the origin of these problems by
investigating the zero-mode solutions of the Ward Identities. A numerical
analysis of the importance of the zero-mode solutions is presented for
four-fermion production processes.
| [
{
"created": "Thu, 13 Mar 2003 11:57:39 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Aug 2003 18:28:59 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Beenakker",
"W.",
""
],
[
"Chapovsky",
"A. P.",
""
],
[
"Kanaki",
"A.",
""
],
[
"Papadopoulos",
"C. G.",
""
],
[
"Pittau",
"R.",
""
]
] | We present a study of the effective action approach to incorporate higher-order effects in e^+e^- -> n fermions. In its minimal version, the effective action approach is found to exhibit problems with unitarity and high-energy behaviour. We identify the origin of these problems by investigating the zero-mode solutions of the Ward Identities. A numerical analysis of the importance of the zero-mode solutions is presented for four-fermion production processes. |
1503.01999 | Eligio Lisi | F. Capozzi, E. Lisi, A. Marrone (U. of Bari and INFN, Bari) | PINGU and the neutrino mass hierarchy: Statistical and systematic
aspects | 20 pages, including 8 figures and 3 tables | Phys. Rev. D 91, 073011 (2015) | 10.1103/PhysRevD.91.073011 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The proposed PINGU project (Precision IceCube Next Generation Upgrade) is
expected to collect O(10^5) atmospheric muon and electron neutrino in a few
years of exposure, and to probe the neutrino mass hierarchy through its imprint
on the event spectra in energy and direction. In the presence of nonnegligible
and partly unknown shape systematics, the analysis of high-statistics spectral
variations will face subtle challenges that are largely unprecedented in
neutrino physics. We discuss these issues both on general grounds and in the
currently envisaged PINGU configuration, where we find that possible shape
uncertainties at the (few) percent level can noticeably affect the sensitivity
to the hierarchy. We also discuss the interplay between the mixing angle
theta_23 and the PINGU sensitivity to the hierarchy. Our results suggest that
more refined estimates of spectral uncertainties are needed in next-generation,
large-volume atmospheric neutrino experiments.
| [
{
"created": "Fri, 6 Mar 2015 16:09:14 GMT",
"version": "v1"
}
] | 2015-04-22 | [
[
"Capozzi",
"F.",
"",
"U. of Bari and INFN, Bari"
],
[
"Lisi",
"E.",
"",
"U. of Bari and INFN, Bari"
],
[
"Marrone",
"A.",
"",
"U. of Bari and INFN, Bari"
]
] | The proposed PINGU project (Precision IceCube Next Generation Upgrade) is expected to collect O(10^5) atmospheric muon and electron neutrino in a few years of exposure, and to probe the neutrino mass hierarchy through its imprint on the event spectra in energy and direction. In the presence of nonnegligible and partly unknown shape systematics, the analysis of high-statistics spectral variations will face subtle challenges that are largely unprecedented in neutrino physics. We discuss these issues both on general grounds and in the currently envisaged PINGU configuration, where we find that possible shape uncertainties at the (few) percent level can noticeably affect the sensitivity to the hierarchy. We also discuss the interplay between the mixing angle theta_23 and the PINGU sensitivity to the hierarchy. Our results suggest that more refined estimates of spectral uncertainties are needed in next-generation, large-volume atmospheric neutrino experiments. |
0710.2275 | Alexander Bakulev P. | A. P. Bakulev, S. V. Mikhailov, A. V. Pimikov, N. G. Stefanis | Pion structure in QCD: From theory to lattice to experimental data | Invited plenary talk presented by the first author at ``Hadron
Structure '07'' International Conference, Modra-Harm{\'o}nia, Slovakia, Sept.
2--7, 2007. 14 pages, 10 figures | Fizika B17:217-230,2008 | null | RUB-TPII-06/07 | hep-ph | null | We describe the present status of the pion distribution amplitude (DA) as it
originates from several sources: (i) a nonperturbative approach based on QCD
sum rules with nonlocal condensates, (ii) an $O(\alpha_s)$ QCD analysis of the
CLEO data on F^{\gamma\gamma^*\pi}(Q^2) with asymptotic and renormalon models
for higher twists, and (iii) recent high-precision lattice QCD calculations of
the second moment of the pion DA. We show predictions for the pion
electromagnetic form factor, obtained in analytic QCD perturbation theory, and
compare it with the JLab data on F_{\pi}(Q^2). We also discuss in this context
an improved model for nonlocal condensates in QCD and show its consequences for
the pion DA and the \gamma\gamma^*\to\pi transition form factor. We include a
brief analysis of meson-induced massive lepton (muon) Drell--Yan production for
the process \pi^{-}N\to\mu^{+}\mu^{-}X, considering both an unpolarized nucleon
target and longitudinally polarized protons.
| [
{
"created": "Thu, 11 Oct 2007 15:26:46 GMT",
"version": "v1"
}
] | 2009-04-17 | [
[
"Bakulev",
"A. P.",
""
],
[
"Mikhailov",
"S. V.",
""
],
[
"Pimikov",
"A. V.",
""
],
[
"Stefanis",
"N. G.",
""
]
] | We describe the present status of the pion distribution amplitude (DA) as it originates from several sources: (i) a nonperturbative approach based on QCD sum rules with nonlocal condensates, (ii) an $O(\alpha_s)$ QCD analysis of the CLEO data on F^{\gamma\gamma^*\pi}(Q^2) with asymptotic and renormalon models for higher twists, and (iii) recent high-precision lattice QCD calculations of the second moment of the pion DA. We show predictions for the pion electromagnetic form factor, obtained in analytic QCD perturbation theory, and compare it with the JLab data on F_{\pi}(Q^2). We also discuss in this context an improved model for nonlocal condensates in QCD and show its consequences for the pion DA and the \gamma\gamma^*\to\pi transition form factor. We include a brief analysis of meson-induced massive lepton (muon) Drell--Yan production for the process \pi^{-}N\to\mu^{+}\mu^{-}X, considering both an unpolarized nucleon target and longitudinally polarized protons. |
0802.2396 | Hiroaki Abuki | H. Abuki (1), M. Ciminale (1 and 2), R. Gatto (3), G. Nardulli (1 and
2), and M. Ruggieri (1 and 2) ((1) INFN, Bari, (2) University of Bari, (3)
University of Geneva) | Enforced neutrality and color-flavor unlocking in the three-flavor
Polyakov-loop NJL model | 11 pages, REVTex4, 10 eps figures; v2: added two notes, added a
reference; version to appear in Phys. Rev. D | Phys.Rev.D77:074018,2008 | 10.1103/PhysRevD.77.074018 | BARI-TH/08-588 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study how the charge neutrality affects the phase structure of
three-flavor PNJL model. We point out that, within the conventional PNJL model
at finite density the color neutrality is missing because the Wilson line
serves as an external ``colored'' field coupled to dynamical quarks. In this
paper we heuristically assume that the model may still be applicable. To get
color neutrality one has then to allow non vanishing color chemical potentials.
We study how the quark matter phase diagram in $(T,m_s^2/\mu)$-plane is
affected by imposing neutrality and by including the Polyakov loop dynamics.
Although these two effects are correlated in a nonlinear way, the impact of the
Polyakov loop turns out to be significant in the $T$ direction, while imposing
neutrality brings a remarkable effect in the $m_s^2/\mu$ direction. In
particular, we find a novel unlocking transition, when the temperature is
increased, even in the chiral SU(3) limit. We clarify how and why this is
possible once the dynamics of the colored Polyakov loop is taken into account.
Also we succeed in giving an analytic expression for $T_c$ for the transition
from two-flavor pairing (2SC) to unpaired quark matter in the presence of the
Polyakov loop.
| [
{
"created": "Sun, 17 Feb 2008 20:36:14 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Apr 2008 19:49:45 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Abuki",
"H.",
"",
"1 and 2"
],
[
"Ciminale",
"M.",
"",
"1 and 2"
],
[
"Gatto",
"R.",
"",
"1 and\n 2"
],
[
"Nardulli",
"G.",
"",
"1 and\n 2"
],
[
"Ruggieri",
"M.",
"",
"1 and 2"
]
] | We study how the charge neutrality affects the phase structure of three-flavor PNJL model. We point out that, within the conventional PNJL model at finite density the color neutrality is missing because the Wilson line serves as an external ``colored'' field coupled to dynamical quarks. In this paper we heuristically assume that the model may still be applicable. To get color neutrality one has then to allow non vanishing color chemical potentials. We study how the quark matter phase diagram in $(T,m_s^2/\mu)$-plane is affected by imposing neutrality and by including the Polyakov loop dynamics. Although these two effects are correlated in a nonlinear way, the impact of the Polyakov loop turns out to be significant in the $T$ direction, while imposing neutrality brings a remarkable effect in the $m_s^2/\mu$ direction. In particular, we find a novel unlocking transition, when the temperature is increased, even in the chiral SU(3) limit. We clarify how and why this is possible once the dynamics of the colored Polyakov loop is taken into account. Also we succeed in giving an analytic expression for $T_c$ for the transition from two-flavor pairing (2SC) to unpaired quark matter in the presence of the Polyakov loop. |
hep-ph/0112066 | Tamas Csorgo | T. Csorgo, M. Gyulassy and D. Kharzeev | Buckyballs and gluon junction networks on the femtometer scale | 12 pages, 2 figures, uses elsart.cls | J.Phys.G30:L17-L25,2004; J.Phys.G30:L17-L26,2004 | 10.1088/0954-3899/30/10/L01 | null | hep-ph | null | We explore the possibility that novel geometrical structures analogous to
carbon Fullerenes may exist in Nature on the femtometer scale. QCD predicts the
existence of special topological gluon field configurations called baryon
junctions and anti-junctions. Here we show that femto-scale structures,
networks or closed (gluon field) cages, can be constructed in the theory of QCD
as tiny cousins of familiar nano-scale structures such as carbonic Fullerenes
C_{60}, C_{70}. The most symmetric polyhedra of QCD junctions (J-balls) are
characterized by the magic numbers 8, 24, 48, and 120, and zero net baryon
number. Tubes, prisms, tori and other topological structures can also be
created. In addition, special configurations can be constructed that are odd
under charge and parity conjugation (CP), although the QCD Lagrangian is CP
even. We provide a semi-classical estimate for the expected mass range of QCD
Buckyballs and discuss the possible conditions under which such novel
topological excitations of the QCD vacuum may be produced in experiments of
high energy physics.
| [
{
"created": "Tue, 4 Dec 2001 23:40:22 GMT",
"version": "v1"
}
] | 2009-10-09 | [
[
"Csorgo",
"T.",
""
],
[
"Gyulassy",
"M.",
""
],
[
"Kharzeev",
"D.",
""
]
] | We explore the possibility that novel geometrical structures analogous to carbon Fullerenes may exist in Nature on the femtometer scale. QCD predicts the existence of special topological gluon field configurations called baryon junctions and anti-junctions. Here we show that femto-scale structures, networks or closed (gluon field) cages, can be constructed in the theory of QCD as tiny cousins of familiar nano-scale structures such as carbonic Fullerenes C_{60}, C_{70}. The most symmetric polyhedra of QCD junctions (J-balls) are characterized by the magic numbers 8, 24, 48, and 120, and zero net baryon number. Tubes, prisms, tori and other topological structures can also be created. In addition, special configurations can be constructed that are odd under charge and parity conjugation (CP), although the QCD Lagrangian is CP even. We provide a semi-classical estimate for the expected mass range of QCD Buckyballs and discuss the possible conditions under which such novel topological excitations of the QCD vacuum may be produced in experiments of high energy physics. |
1609.06969 | Aritra Bandyopadhyay | Aritra Bandyopadhyay and Munshi G Mustafa | Power corrections to the electromagnetic spectral function and the
dilepton rate in QCD plasma within operator product expansion in D=4 | 24 pages, 8 figures; Discussion added on OPE scales, version accepted
in JHEP | null | 10.1007/JHEP11(2016)183 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We evaluate the electromagnetic spectral function in QCD plasma in a
nonperturbative background of in-medium quark and gluon condensates by
incorporating the leading order power corrections in a systematic framework
within the ambit of the operator product expansion in D=4 dimension. We
explicitly show that the mixing of the composite operators removes mass
singularities and renders Wilson coefficients finite and well defined. As a
spectral property, we then obtain the nonperturbative dilepton production rate
from QCD plasma. The operator product expansion automatically restricts the
dilepton rate to the intermediate mass range, which is found to be enhanced due
to the power corrections. We also compare our result with those from
nonperturbative calculations, e.g., lattice QCD and effective QCD models based
on Polyakov loop.
| [
{
"created": "Thu, 22 Sep 2016 13:37:33 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Nov 2016 17:13:48 GMT",
"version": "v2"
}
] | 2016-12-21 | [
[
"Bandyopadhyay",
"Aritra",
""
],
[
"Mustafa",
"Munshi G",
""
]
] | We evaluate the electromagnetic spectral function in QCD plasma in a nonperturbative background of in-medium quark and gluon condensates by incorporating the leading order power corrections in a systematic framework within the ambit of the operator product expansion in D=4 dimension. We explicitly show that the mixing of the composite operators removes mass singularities and renders Wilson coefficients finite and well defined. As a spectral property, we then obtain the nonperturbative dilepton production rate from QCD plasma. The operator product expansion automatically restricts the dilepton rate to the intermediate mass range, which is found to be enhanced due to the power corrections. We also compare our result with those from nonperturbative calculations, e.g., lattice QCD and effective QCD models based on Polyakov loop. |
hep-ph/0009352 | B. F. L. Ward | B.F.L. Ward (1,2,3), S. Jadach (1,2,4,5), W. P{\l}aczek (2,6), M.
Skrzypek (2,5), Z. Was (2,5) ((1) Department of Physics and Astronomy,
University of Tennessee, Knoxville, TN, USA, (2) TH Div., CERN, Geneva,
Switzerland, (3) SLAC, Stanford UNiversity, Stanford, CA, USA, (4) Theory
Div., DESY, Hamburg, Germany, (5) Institute of Nuclear Physics, Krakow,
Poland, (6) Institute of Computer Science, Jagellonian University, Krakow,
Poland) | Coherent Exclusive Exponentiation for Precision Monte Carlo Calculations
of Fermion Pair Production / Precision Predictions for (Un)stable W+W- Pairs | 5 pages, 4 figures, Presented at ICHEP2000 | null | null | UTHEP-00-0901 | hep-ph | null | We present the new Coherent Exclusive Exponentiation (CEEX), in comparison to
the older Exclusive Exponentiation (EEX) and the semi-analytical Inclusive
Exponentiation (IEX), for the process e+e- -> f-bar f + n(gamma),
f=mu,tau,d,u,s,c,b, with validity for centre of mass energies from tau lepton
threshold to 1 TeV. We analyse 2f numerical results at the Z-peak, 189 GeV and
500 GeV. We also present precision calculations of the signal processes e+e- ->
4f in which the double resonant W+W- intermediate state occurs using our
YFSWW3-1.14 MC. Sample 4f Monte Carlo data are explicitly illustrated in
comparison to the literature at LEP2 energies. These comparisons show that a TU
for the signal process cross section of 0.4 percent is valid for the LEP2 200
GeV energy. LC energy results are also shown.
| [
{
"created": "Fri, 29 Sep 2000 14:22:31 GMT",
"version": "v1"
}
] | 2009-09-25 | [
[
"Ward",
"B. F. L.",
""
],
[
"Jadach",
"S.",
""
],
[
"Płaczek",
"W.",
""
],
[
"Skrzypek",
"M.",
""
],
[
"Was",
"Z.",
""
]
] | We present the new Coherent Exclusive Exponentiation (CEEX), in comparison to the older Exclusive Exponentiation (EEX) and the semi-analytical Inclusive Exponentiation (IEX), for the process e+e- -> f-bar f + n(gamma), f=mu,tau,d,u,s,c,b, with validity for centre of mass energies from tau lepton threshold to 1 TeV. We analyse 2f numerical results at the Z-peak, 189 GeV and 500 GeV. We also present precision calculations of the signal processes e+e- -> 4f in which the double resonant W+W- intermediate state occurs using our YFSWW3-1.14 MC. Sample 4f Monte Carlo data are explicitly illustrated in comparison to the literature at LEP2 energies. These comparisons show that a TU for the signal process cross section of 0.4 percent is valid for the LEP2 200 GeV energy. LC energy results are also shown. |
hep-ph/9210280 | My Account | J. Lopez, D. Nanopoulos, and A. Zichichi | The Simplest, String-Derivable, Supergravity Model and its Experimental
Predictions | 29 pages plus nine figures (not included). CTP-TAMU-68/92,
CERN-TH.6667/92 | Phys.Rev.D49:343-354,1994 | 10.1103/PhysRevD.49.343 | null | hep-ph | null | We present the simplest, string-derivable, supergravity model and discuss its
experimental consequences. This model is a new string-inspired flipped $SU(5)$
which unifies at the string scale $M_U=10^{18}\GeV$ due to the introduction of
an additional pair of \r{10},\rb{10} flipped $SU(5)$ representations which
contain new intermediate scale `gap' particles. We study various model-building
issues which should be addressed in string-derived incarnations of this model.
We focus our study on the no-scale supergravity mechanism and explore
thoroughly the three-dimensional parameter space of the model ($m_{\tilde
g},m_t,\tan\beta$), thus obtaining several simple relationships among the
particle masses, such as: $m_{\tilde q}\approx m_{\tilde g}$, $m_{\tilde
e_L}\approx m_{\tilde\nu}\approx0.30 m_{\tilde g}$, $m_{\tilde
e_R}\approx0.18m_{\tilde g}$, and $m_{\chi^0_2}\approx2m_{\chi^0_1}\approx
m_{\chi^\pm_1}$. In a strict interpretation of the no-scale supergravity
scenario we solve for $\tan\beta$ as a function of $m_t$ and $m_{\tilde g}$,
and show that $m_t$ determines not only the sign of the Higgs mixing parameter
$\mu$ but also whether the lightest Higgs boson mass is above or below
$100\GeV$. We also find that throughout the parameter space the neutralino
relic abundance is within observational bounds ($\Omega_\chi h^2_0\lsim0.25$)
and may account for a significant portion of the dark matter in the Universe.
| [
{
"created": "Fri, 30 Oct 1992 16:27:30 GMT",
"version": "v1"
}
] | 2009-08-25 | [
[
"Lopez",
"J.",
""
],
[
"Nanopoulos",
"D.",
""
],
[
"Zichichi",
"A.",
""
]
] | We present the simplest, string-derivable, supergravity model and discuss its experimental consequences. This model is a new string-inspired flipped $SU(5)$ which unifies at the string scale $M_U=10^{18}\GeV$ due to the introduction of an additional pair of \r{10},\rb{10} flipped $SU(5)$ representations which contain new intermediate scale `gap' particles. We study various model-building issues which should be addressed in string-derived incarnations of this model. We focus our study on the no-scale supergravity mechanism and explore thoroughly the three-dimensional parameter space of the model ($m_{\tilde g},m_t,\tan\beta$), thus obtaining several simple relationships among the particle masses, such as: $m_{\tilde q}\approx m_{\tilde g}$, $m_{\tilde e_L}\approx m_{\tilde\nu}\approx0.30 m_{\tilde g}$, $m_{\tilde e_R}\approx0.18m_{\tilde g}$, and $m_{\chi^0_2}\approx2m_{\chi^0_1}\approx m_{\chi^\pm_1}$. In a strict interpretation of the no-scale supergravity scenario we solve for $\tan\beta$ as a function of $m_t$ and $m_{\tilde g}$, and show that $m_t$ determines not only the sign of the Higgs mixing parameter $\mu$ but also whether the lightest Higgs boson mass is above or below $100\GeV$. We also find that throughout the parameter space the neutralino relic abundance is within observational bounds ($\Omega_\chi h^2_0\lsim0.25$) and may account for a significant portion of the dark matter in the Universe. |
hep-ph/0001056 | null | Kenneth Lane, Tonguc Rador, and Estia Eichten | Vacuum Alignment in Technicolor Theories-I. The Technifermion Sector | 19 pages, Latex with one postscript figure | Phys.Rev. D62 (2000) 015005 | 10.1103/PhysRevD.62.015005 | BUHEP-00-01, FERMILAB-PUB-00/008-T | hep-ph hep-ex | null | We have carried out numerical studies of vacuum alignment in technicolor
models of electroweak and flavor symmetry breaking. The goal is to understand
alignment's implications for strong and weak CP nonconservation in quark
interactions. In this first part, we restrict our attention to the
technifermion sector of simple models. We find several interesting phenomena,
including (1) the possibility that all observable phases in the technifermions'
unitary vacuum-alignment matrix are integer multiples of \pi/N' where N' \le N,
the number of technifermion doublets, and (2) the possibility of exceptionally
light pseudoGoldstone technipions.
| [
{
"created": "Fri, 7 Jan 2000 21:34:14 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Lane",
"Kenneth",
""
],
[
"Rador",
"Tonguc",
""
],
[
"Eichten",
"Estia",
""
]
] | We have carried out numerical studies of vacuum alignment in technicolor models of electroweak and flavor symmetry breaking. The goal is to understand alignment's implications for strong and weak CP nonconservation in quark interactions. In this first part, we restrict our attention to the technifermion sector of simple models. We find several interesting phenomena, including (1) the possibility that all observable phases in the technifermions' unitary vacuum-alignment matrix are integer multiples of \pi/N' where N' \le N, the number of technifermion doublets, and (2) the possibility of exceptionally light pseudoGoldstone technipions. |
0902.0372 | Martin Block | Martin M. Block and Loyal Durand | Analytic derivation of the leading-order gluon distribution function
$G(x,Q^2)=xg(x,Q^2)$ from the proton structure function $F_2^{\gamma
p}(x,Q^2)$. II. Effect of heavy quarks | 19 pages, 6 figures and 1 table Sign typos in Eqs. 32-35 and some
typos elsewhere corrected, results unchanged | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extend our previous derivation of an exact expression for the
leading-order (LO) gluon distribution function $G(x,Q^2)=xg(x,Q^2)$ from the
DGLAP evolution equation for the proton structure function $F_2^{\gamma
p}(x,Q^2)$ for deep inelastic $\gamma^* p$ scattering to include the effects of
heavy-quark masses. We derive the equation for $G(x,Q^2)$ in two different
ways, first using our original differential-equation method, and then using a
new method based on Laplace transforms. The results do not require the use of
the gluon evolution equation, or, to good approximation, knowledge of the
individual quark distributions. Given an analytic expression that successfully
reproduces the known experimental data for $F_2^{\gamma p}(x,Q^2)$ in a domain
${\cal D}(x,Q^2)$--where $x_{\rm min}(Q^2) \le x \le x_{\rm max}(Q^2)$,
$Q^2_{\rm min}\le Q^2\le Q^2_{\rm max}$ of the Bjorken variable $x$ and the
virtuality $Q^2$--$G(x,Q^2)$ is uniquely determined in the same domain. As an
application of the method, we construct a new global parametrization of the
complete set of ZEUS data on $F_2^{\gamma p}(x,Q^2)$, and use this to determine
the 5 quark gluon distribution, $G(x,Q^2)$, for massless $u, d, s$ and massive
$c, b$ quarks and discuss the mass effects evident in the result. We compare
these results to the gluon distributions for CTEQ6L, and in the domain ${\cal
D}(x,Q^2)$ where they should agree, they do not; the discrepancy is due to the
fact that the CTEQ6L results do not give an accurate description of the ZEUS
$F_2^{\gamma p}(x,Q^2)$ experimental data. We emphasize that our method for
obtaining the LO gluon distribution connects $G(x,Q^2)$ {\em directly} to the
proton structure function without either the need for individual parton
distributions or the gluon evolution equation.
| [
{
"created": "Mon, 2 Feb 2009 21:13:36 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Feb 2009 04:07:43 GMT",
"version": "v2"
},
{
"created": "Fri, 13 Feb 2009 21:26:39 GMT",
"version": "v3"
}
] | 2009-02-13 | [
[
"Block",
"Martin M.",
""
],
[
"Durand",
"Loyal",
""
]
] | We extend our previous derivation of an exact expression for the leading-order (LO) gluon distribution function $G(x,Q^2)=xg(x,Q^2)$ from the DGLAP evolution equation for the proton structure function $F_2^{\gamma p}(x,Q^2)$ for deep inelastic $\gamma^* p$ scattering to include the effects of heavy-quark masses. We derive the equation for $G(x,Q^2)$ in two different ways, first using our original differential-equation method, and then using a new method based on Laplace transforms. The results do not require the use of the gluon evolution equation, or, to good approximation, knowledge of the individual quark distributions. Given an analytic expression that successfully reproduces the known experimental data for $F_2^{\gamma p}(x,Q^2)$ in a domain ${\cal D}(x,Q^2)$--where $x_{\rm min}(Q^2) \le x \le x_{\rm max}(Q^2)$, $Q^2_{\rm min}\le Q^2\le Q^2_{\rm max}$ of the Bjorken variable $x$ and the virtuality $Q^2$--$G(x,Q^2)$ is uniquely determined in the same domain. As an application of the method, we construct a new global parametrization of the complete set of ZEUS data on $F_2^{\gamma p}(x,Q^2)$, and use this to determine the 5 quark gluon distribution, $G(x,Q^2)$, for massless $u, d, s$ and massive $c, b$ quarks and discuss the mass effects evident in the result. We compare these results to the gluon distributions for CTEQ6L, and in the domain ${\cal D}(x,Q^2)$ where they should agree, they do not; the discrepancy is due to the fact that the CTEQ6L results do not give an accurate description of the ZEUS $F_2^{\gamma p}(x,Q^2)$ experimental data. We emphasize that our method for obtaining the LO gluon distribution connects $G(x,Q^2)$ {\em directly} to the proton structure function without either the need for individual parton distributions or the gluon evolution equation. |
0807.0985 | Kazuhiro Tanaka | Hiroyuki Kawamura (1), Kazuhiro Tanaka (2) ((1) Univ. of Liverpool,
(2) Juntendo Univ.) | Double Transverse-Spin Asymmetries for Drell-Yan Process in pp and
p\bar{p} Collisions: Role of Nonleading QCD Corrections at Small Transverse
Momentum | 4 pages, 1 figure. To appear in the proceedings of the XVI
International Workshop on Deep Inelastic Scattering and Related Subjects, DIS
2008, London, U.K., 7-11 April, 2008 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the double-spin asymmetries in transversely polarized Drell-Yan
process, calculating all-order gluon resummation corrections up to the
next-to-leading logarithmic accuracy. This resummation is relevant when the
transverse-momentum Q_T of the produced lepton pair is small, and reproduces
the (fixed-order) next-to-leading QCD corrections upon integrating over Q_T.
The resummation corrections behave differently between pp- and
p\bar{p}-collision cases and are small for the latter case at the kinematics in
the proposed GSI experiments. This fact allows us to predict large value of the
double-spin asymmetries at GSI, using the recent empirical information on the
transversity.
| [
{
"created": "Mon, 7 Jul 2008 10:27:46 GMT",
"version": "v1"
}
] | 2008-07-08 | [
[
"Kawamura",
"Hiroyuki",
""
],
[
"Tanaka",
"Kazuhiro",
""
]
] | We discuss the double-spin asymmetries in transversely polarized Drell-Yan process, calculating all-order gluon resummation corrections up to the next-to-leading logarithmic accuracy. This resummation is relevant when the transverse-momentum Q_T of the produced lepton pair is small, and reproduces the (fixed-order) next-to-leading QCD corrections upon integrating over Q_T. The resummation corrections behave differently between pp- and p\bar{p}-collision cases and are small for the latter case at the kinematics in the proposed GSI experiments. This fact allows us to predict large value of the double-spin asymmetries at GSI, using the recent empirical information on the transversity. |
1307.3790 | Lei Wu | Chengcheng Han, Xuanting Ji, Lei Wu, Peiwen Wu, Jin Min Yang | Higgs pair production with SUSY QCD correction: revisited under current
experimental constraints | discussions and references added, accepted by JHEP | null | 10.1007/JHEP04(2014)003 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the current experimental constraints on the parameter space of
the MSSM and NMSSM. Then in the allowed parameter space we examine the Higgs
pair production at the 14 TeV LHC via $b\bar{b}\to hh$ ($h$ is the 125 GeV
SM-like Higg boson) with one-loop SUSY QCD correction and compare it with the
production via $gg\to hh$. We obtain the following observations: (i) For the
MSSM the production rate of $b\bar{b} \to hh$ can reach 50 fb and thus can be
competitive with $gg \to hh$, while for the NMSSM $b\bar{b} \to hh$ has a much
smaller rate than $gg \to hh$ due to the suppression of the $hb\bar{b}$
coupling; (ii) The SUSY-QCD correction to $b\bar{b} \to hh$ is sizable, which
can reach $45\%$ for the MSSM and $15\%$ for the NMSSM within the $1\sigma$
region of the Higgs data; (iii) In the heavy SUSY limit (all soft mass
parameters become heavy), the SUSY effects decouple rather slowly from the
Higgs pair production (especially the $gg\to hh$ process), which, for $M_{\rm
SUSY}=5$ TeV and $m_A<1$ TeV, can enhance the production rate by a factor of
1.5 and 1.3 for the MSSM and NMSSM, respectively. So, the Higgs pair production
may be helpful for unraveling the effects of heavy SUSY.
| [
{
"created": "Sun, 14 Jul 2013 22:50:37 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Mar 2014 13:56:31 GMT",
"version": "v2"
}
] | 2015-06-16 | [
[
"Han",
"Chengcheng",
""
],
[
"Ji",
"Xuanting",
""
],
[
"Wu",
"Lei",
""
],
[
"Wu",
"Peiwen",
""
],
[
"Yang",
"Jin Min",
""
]
] | We consider the current experimental constraints on the parameter space of the MSSM and NMSSM. Then in the allowed parameter space we examine the Higgs pair production at the 14 TeV LHC via $b\bar{b}\to hh$ ($h$ is the 125 GeV SM-like Higg boson) with one-loop SUSY QCD correction and compare it with the production via $gg\to hh$. We obtain the following observations: (i) For the MSSM the production rate of $b\bar{b} \to hh$ can reach 50 fb and thus can be competitive with $gg \to hh$, while for the NMSSM $b\bar{b} \to hh$ has a much smaller rate than $gg \to hh$ due to the suppression of the $hb\bar{b}$ coupling; (ii) The SUSY-QCD correction to $b\bar{b} \to hh$ is sizable, which can reach $45\%$ for the MSSM and $15\%$ for the NMSSM within the $1\sigma$ region of the Higgs data; (iii) In the heavy SUSY limit (all soft mass parameters become heavy), the SUSY effects decouple rather slowly from the Higgs pair production (especially the $gg\to hh$ process), which, for $M_{\rm SUSY}=5$ TeV and $m_A<1$ TeV, can enhance the production rate by a factor of 1.5 and 1.3 for the MSSM and NMSSM, respectively. So, the Higgs pair production may be helpful for unraveling the effects of heavy SUSY. |
2304.14153 | Zhi-Gang Wang | Zhi-Gang Wang | Analysis of the decay $Y(4500)\to D^*\bar{D}^*\pi$ with the light-cone
QCD sum rules | 11 pages, 3 figure | Nucl. Phys. B993 (2023) 116265 | 10.1016/j.nuclphysb.2023.116265 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In this work, we tentatively assign the $Y(4500)$ as the
$[uc]_{\tilde{A}}[\overline{uc}]_{V}+[uc]_{V}[\overline{uc}]_{\tilde{A}}+[dc]_{\tilde{A}}[\overline{dc}]_{V}
+[dc]_{V}[\overline{dc}]_{\tilde{A}}$ tetraquark state with the quantum numbers
$J^{PC}=1^{--}$, and study the three-body strong decay $Y(4500)\to
D^{*-}D^{*0}\pi^+$ with the light-cone QCD sum rules. It is the first time to
use the light-cone QCD sum rules to calculate the four-hadron coupling
constants, the approach can be extended to study other three-body strong decays
directly and diagnose the $X$, $Y$ and $Z$ states.
| [
{
"created": "Thu, 27 Apr 2023 12:49:44 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Jun 2023 13:22:09 GMT",
"version": "v2"
}
] | 2023-06-23 | [
[
"Wang",
"Zhi-Gang",
""
]
] | In this work, we tentatively assign the $Y(4500)$ as the $[uc]_{\tilde{A}}[\overline{uc}]_{V}+[uc]_{V}[\overline{uc}]_{\tilde{A}}+[dc]_{\tilde{A}}[\overline{dc}]_{V} +[dc]_{V}[\overline{dc}]_{\tilde{A}}$ tetraquark state with the quantum numbers $J^{PC}=1^{--}$, and study the three-body strong decay $Y(4500)\to D^{*-}D^{*0}\pi^+$ with the light-cone QCD sum rules. It is the first time to use the light-cone QCD sum rules to calculate the four-hadron coupling constants, the approach can be extended to study other three-body strong decays directly and diagnose the $X$, $Y$ and $Z$ states. |
hep-ph/0203169 | null | Abhijit Bandyopadhyay, Sandhya Choubey, Srubabati Goswami, D.P.Roy | What can the SNO Neutral Current Rate teach us about the Solar Neutrino
Anomaly | Brief discussion on the first NC result from SNO added; final version
to be published in the MPLA | Mod.Phys.Lett. A17 (2002) 1455-1464 | 10.1142/S021773230200734X | SINP/TNP/02-8,TIFR/TH/02-10 | hep-ph hep-ex | null | We investigate how the anticipated neutral current rate from $SNO$ will
sharpen our understanding of the solar neutrino anomaly. Quantitative analyses
are performed with representative values of this rate in the expected range of
$0.8 - 1.2$. This would provide a $5 - 10 \sigma$ signal for $\nu_e$ transition
into a state containing an active neutrino component. Assuming this state to be
purely active one can estimate both the $^8B$ neutrino flux and the $\nu_e$
survival probability to a much higher precision than currently possible.
Finally the measured value of the $NC$ rate will have profound implications for
the mass and mixing parameters of the solar neutrino oscillation solution.
| [
{
"created": "Mon, 18 Mar 2002 14:33:20 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Jun 2002 11:20:27 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Bandyopadhyay",
"Abhijit",
""
],
[
"Choubey",
"Sandhya",
""
],
[
"Goswami",
"Srubabati",
""
],
[
"Roy",
"D. P.",
""
]
] | We investigate how the anticipated neutral current rate from $SNO$ will sharpen our understanding of the solar neutrino anomaly. Quantitative analyses are performed with representative values of this rate in the expected range of $0.8 - 1.2$. This would provide a $5 - 10 \sigma$ signal for $\nu_e$ transition into a state containing an active neutrino component. Assuming this state to be purely active one can estimate both the $^8B$ neutrino flux and the $\nu_e$ survival probability to a much higher precision than currently possible. Finally the measured value of the $NC$ rate will have profound implications for the mass and mixing parameters of the solar neutrino oscillation solution. |
1410.2057 | Martin Spinrath | Julia Gehrlein, Jens P. Oppermann, Daniela Sch\"afer, Martin Spinrath | An SU(5) x A5 Golden Ratio Flavour Model | 34 pages, 5 figures; version published in Nucl. Phys. B | Nucl. Phys. B 890 (2015) 539 | 10.1016/j.nuclphysb.2014.11.023 | TTP14-028 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we study an SU(5) x A5 flavour model which exhibits a neutrino
mass sum rule and golden ratio mixing in the neutrino sector which is corrected
from the charged lepton Yukawa couplings. We give the full renormalizable
superpotential for the model which breaks SU(5) and A5 after integrating out
heavy messenger fields and minimising the scalar potential. The mass sum rule
allows for both mass orderings but we will show that inverted ordering is not
valid in this setup. For normal ordering we find the lightest neutrino to have
a mass of about 10-50 meV, and all leptonic mixing angles in agreement with
experiment.
| [
{
"created": "Wed, 8 Oct 2014 10:48:06 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Dec 2014 12:25:02 GMT",
"version": "v2"
}
] | 2014-12-15 | [
[
"Gehrlein",
"Julia",
""
],
[
"Oppermann",
"Jens P.",
""
],
[
"Schäfer",
"Daniela",
""
],
[
"Spinrath",
"Martin",
""
]
] | In this paper we study an SU(5) x A5 flavour model which exhibits a neutrino mass sum rule and golden ratio mixing in the neutrino sector which is corrected from the charged lepton Yukawa couplings. We give the full renormalizable superpotential for the model which breaks SU(5) and A5 after integrating out heavy messenger fields and minimising the scalar potential. The mass sum rule allows for both mass orderings but we will show that inverted ordering is not valid in this setup. For normal ordering we find the lightest neutrino to have a mass of about 10-50 meV, and all leptonic mixing angles in agreement with experiment. |
0708.4394 | Andre Sopczak | S. Hesselbach (Southampton U.), S. Moretti (Southampton U. and Orsay,
LPT), J. Rathsman (Uppsala U.) and A. Sopczak (Uppsala U. and Lancaster U.) | Studies of Spin Effects in Charged Higgs Boson Production with an
Iterative Discriminant Analysis at the Tevatron and LHC | 19 pages, 21 figures; updated title for EPJC | Eur.Phys.J.C53:311-327,2008 | 10.1140/epjc/s10052-007-0480-7 | SHEP-06-36, LPT-ORSAY-07-103 | hep-ph | null | We report on detailed Monte Carlo comparisons of selection variables to
separate tbH+ signal events from the Standard Model ttbar background using an
Iterative Discriminant Analysis (IDA) method. While kinematic differences exist
between the two processes whenever m(H+).ne.m(W+), the exploration of the spin
difference between the charged Higgs and the W+ gauge boson becomes crucial in
the particularly challenging case of near degeneracy of the charged Higgs boson
mass with the W+ mass. The TAUOLA package is used to decay the tau leptons
emerging from the charged Higgs and W+ boson decays taking the spin difference
properly into account. We demonstrate that, even if the individual selection
variables have limited discriminant power, the IDA method achieves a
significant separation between the expected signal and background. For both
Tevatron and LHC energies, the impact of the spin effects and H+ mass on the
separation of signal and background has been studied quantitatively. The effect
of a hard transverse momentum cut to remove QCD background has been studied and
it is found that the spin effects remain important. The separation is expressed
in purity versus efficiency curves. The study is performed for charged Higgs
boson masses between the W+ mass and near the top mass.
| [
{
"created": "Fri, 31 Aug 2007 18:16:09 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Jan 2008 17:07:48 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Hesselbach",
"S.",
"",
"Southampton U."
],
[
"Moretti",
"S.",
"",
"Southampton U. and Orsay,\n LPT"
],
[
"Rathsman",
"J.",
"",
"Uppsala U."
],
[
"Sopczak",
"A.",
"",
"Uppsala U. and Lancaster U."
]
] | We report on detailed Monte Carlo comparisons of selection variables to separate tbH+ signal events from the Standard Model ttbar background using an Iterative Discriminant Analysis (IDA) method. While kinematic differences exist between the two processes whenever m(H+).ne.m(W+), the exploration of the spin difference between the charged Higgs and the W+ gauge boson becomes crucial in the particularly challenging case of near degeneracy of the charged Higgs boson mass with the W+ mass. The TAUOLA package is used to decay the tau leptons emerging from the charged Higgs and W+ boson decays taking the spin difference properly into account. We demonstrate that, even if the individual selection variables have limited discriminant power, the IDA method achieves a significant separation between the expected signal and background. For both Tevatron and LHC energies, the impact of the spin effects and H+ mass on the separation of signal and background has been studied quantitatively. The effect of a hard transverse momentum cut to remove QCD background has been studied and it is found that the spin effects remain important. The separation is expressed in purity versus efficiency curves. The study is performed for charged Higgs boson masses between the W+ mass and near the top mass. |
hep-ph/0003298 | C. J. A. P. Martins | C.J.A.P. Martins and E.P.S. Shellard (DAMTP, CMS, Cambridge) | Extending the Velocity-dependent One-scale String Evolution Model | 16 pages, 6 figures, submitted to Phys. Rev. D | Phys.Rev.D65:043514,2002 | 10.1103/PhysRevD.65.043514 | null | hep-ph astro-ph gr-qc | null | We provide a general overview of the velocity-dependent one-scale model for
cosmic string evolution and discuss two further extensions to it. We introduce
and justify a new ansatz for the momentum parameter $k$, and also incorporate
the effect of radiation backreaction. We thus discuss the evolution of the
basic large-scale features of cosmic string networks in all relevant
cosmological scenarios, concentrating in particular on the `scaling' solutions
relevant for each case. In a companion paper, we show, by comparing with
numerical simulations, that this model provides an accurate description of the
large-scale features of cosmic string networks.
| [
{
"created": "Thu, 30 Mar 2000 14:36:07 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Martins",
"C. J. A. P.",
"",
"DAMTP, CMS, Cambridge"
],
[
"Shellard",
"E. P. S.",
"",
"DAMTP, CMS, Cambridge"
]
] | We provide a general overview of the velocity-dependent one-scale model for cosmic string evolution and discuss two further extensions to it. We introduce and justify a new ansatz for the momentum parameter $k$, and also incorporate the effect of radiation backreaction. We thus discuss the evolution of the basic large-scale features of cosmic string networks in all relevant cosmological scenarios, concentrating in particular on the `scaling' solutions relevant for each case. In a companion paper, we show, by comparing with numerical simulations, that this model provides an accurate description of the large-scale features of cosmic string networks. |
0910.2128 | Ingrid Kraus | H. Oeschler, J. Cleymans, K. Redlich and S. Wheaton | Statistical Model and the mesonic-baryonic transition region | 9 pages, 7 figures, CPOD conference proceedings | PoS CPOD2009:032,2009 | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The statistical model assuming chemical equilibriumand local strangeness
conservation describes most of the observed features of strange particle
production from SIS up to RHIC. Deviations are found as the maximum in the
measured K+/pi+ ratio is much sharper than in the model calculations. At the
incident energy of the maximum, the statistical model shows that freeze out
changes regime from one being dominated by baryons at the lower energies toward
one being dominated by mesons. It will be shown how deviations from the usual
freeze-out curve influence the various particle ratios. Furthermore, other
observables exhibit also changes just in this energy regime.
| [
{
"created": "Mon, 12 Oct 2009 10:19:46 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Oeschler",
"H.",
""
],
[
"Cleymans",
"J.",
""
],
[
"Redlich",
"K.",
""
],
[
"Wheaton",
"S.",
""
]
] | The statistical model assuming chemical equilibriumand local strangeness conservation describes most of the observed features of strange particle production from SIS up to RHIC. Deviations are found as the maximum in the measured K+/pi+ ratio is much sharper than in the model calculations. At the incident energy of the maximum, the statistical model shows that freeze out changes regime from one being dominated by baryons at the lower energies toward one being dominated by mesons. It will be shown how deviations from the usual freeze-out curve influence the various particle ratios. Furthermore, other observables exhibit also changes just in this energy regime. |
1301.3453 | P. S. Bhupal Dev | P. S. Bhupal Dev, Dilip Kumar Ghosh, Nobuchika Okada, Ipsita Saha | 125 GeV Higgs Boson and the Type-II Seesaw Model | 29 pages, 7 figures, 2 tables; corrected Eq. (5.11) and related
discussion, updated Table 2 and Figures 5-7 | JHEP 1303, 150 (2013) | 10.1007/JHEP05(2013)049, 10.1007/JHEP03(2013)150 | MAN/HEP/2012/021 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the vacuum stability and unitarity conditions for a 125 GeV Standard
Model (SM)-like Higgs boson mass in the type-II seesaw model. We find that, as
long as the seesaw scale is introduced below the SM vacuum instability bound,
there exists a large parameter space predicting a 125 GeV Higgs mass,
irrespective of the exact value of the seesaw scale, satisfying both stability
and unitarity conditions up to the Planck scale. We also study the model
predictions for the Higgs partial decay widths in the diphoton and Z+photon
channels with respect to their SM expectations and find that the decay rates
for these two processes are correlated. We further show that for any given
enhancement in the Higgs-to-diphoton rate over its SM expectation, there exists
an upper bound on the type-II seesaw scale, and hence, on the masses of the
associated doubly- and singly-charged Higgs bosons in the allowed parameter
space. For instance, if more than 10% enhancement persists in the
Higgs-to-diphoton channel, the upper limit on the type-II seesaw scale is about
450 GeV which is completely within the reach of the 14 TeV LHC. We believe this
to be an encouraging result for the experimental searches of the singly- and
doubly-charged Higgs bosons which, in combination with improved sensitivity in
the Higgs-to-diphoton and Higgs-to-Z+photon signal strengths, could probe the
entire allowed parameter space of the minimal type-II seesaw model, and
establish/eliminate it as a single viable extension of the SM.
| [
{
"created": "Tue, 15 Jan 2013 18:56:12 GMT",
"version": "v1"
},
{
"created": "Thu, 31 Jan 2013 14:57:54 GMT",
"version": "v2"
},
{
"created": "Mon, 29 Apr 2013 18:47:54 GMT",
"version": "v3"
}
] | 2014-10-13 | [
[
"Dev",
"P. S. Bhupal",
""
],
[
"Ghosh",
"Dilip Kumar",
""
],
[
"Okada",
"Nobuchika",
""
],
[
"Saha",
"Ipsita",
""
]
] | We study the vacuum stability and unitarity conditions for a 125 GeV Standard Model (SM)-like Higgs boson mass in the type-II seesaw model. We find that, as long as the seesaw scale is introduced below the SM vacuum instability bound, there exists a large parameter space predicting a 125 GeV Higgs mass, irrespective of the exact value of the seesaw scale, satisfying both stability and unitarity conditions up to the Planck scale. We also study the model predictions for the Higgs partial decay widths in the diphoton and Z+photon channels with respect to their SM expectations and find that the decay rates for these two processes are correlated. We further show that for any given enhancement in the Higgs-to-diphoton rate over its SM expectation, there exists an upper bound on the type-II seesaw scale, and hence, on the masses of the associated doubly- and singly-charged Higgs bosons in the allowed parameter space. For instance, if more than 10% enhancement persists in the Higgs-to-diphoton channel, the upper limit on the type-II seesaw scale is about 450 GeV which is completely within the reach of the 14 TeV LHC. We believe this to be an encouraging result for the experimental searches of the singly- and doubly-charged Higgs bosons which, in combination with improved sensitivity in the Higgs-to-diphoton and Higgs-to-Z+photon signal strengths, could probe the entire allowed parameter space of the minimal type-II seesaw model, and establish/eliminate it as a single viable extension of the SM. |
hep-ph/9608301 | Leonid Burakovsky | L. Burakovsky and L.P. Horwitz | Mass Spectrum of a Meson Nonet is Linear | 11 pages, LaTeX, 4 postscript figures following the main text | Found.Phys.Lett. 9 (1996) 561-574 | 10.1007/BF02190031 | LA-UR-96-2499, IASSNS-HEP-96/76 | hep-ph | null | It is argued that the mass spectrum of a meson nonet is linear, consistent
with the standard Gell-Mann--Okubo mass formula and leading to an extra
Gell-Mann--Okubo mass relation for the masses of the isoscalar states. This
relation is shown to hold with an accuracy of up to $\sim $3\% for all
well-established nonets. It also suggests a new $q\bar{q}$ assignment for the
scalar meson nonet.
| [
{
"created": "Fri, 9 Aug 1996 18:32:15 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Burakovsky",
"L.",
""
],
[
"Horwitz",
"L. P.",
""
]
] | It is argued that the mass spectrum of a meson nonet is linear, consistent with the standard Gell-Mann--Okubo mass formula and leading to an extra Gell-Mann--Okubo mass relation for the masses of the isoscalar states. This relation is shown to hold with an accuracy of up to $\sim $3\% for all well-established nonets. It also suggests a new $q\bar{q}$ assignment for the scalar meson nonet. |
hep-ph/0308273 | Alexei Nefediev | P.J.A.Bicudo (IST, Lisbon), A.V.Nefediev (ITEP, Moscow) | Vacuum replicas in two-dimensional QCD | LaTeX2e, 9 pages, 1 Postscript figure, uses epsfig.sty, to appear in
Phys.Lett.B | Phys.Lett. B573 (2003) 131-137 | 10.1016/j.physletb.2003.08.059 | null | hep-ph | null | Two-dimensional QCD is studied from the point of view of existence of
multiple chirally noninvariant solutions to the mass-gap equation. The
ground-state solution is reproduced and an infinite set of replica solutions is
discovered for this equation using the WKB quantisation procedure.
| [
{
"created": "Wed, 27 Aug 2003 09:39:43 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Bicudo",
"P. J. A.",
"",
"IST, Lisbon"
],
[
"Nefediev",
"A. V.",
"",
"ITEP, Moscow"
]
] | Two-dimensional QCD is studied from the point of view of existence of multiple chirally noninvariant solutions to the mass-gap equation. The ground-state solution is reproduced and an infinite set of replica solutions is discovered for this equation using the WKB quantisation procedure. |
2102.05412 | Yuhei Nakayama | Masahiro Ibe, Shin Kobayashi, Yuhei Nakayama, Satoshi Shirai | On Stability of Fermionic Superconducting Current in Cosmic String | 24 pages, 7 figures | null | 10.1007/JHEP05(2021)217 | IPMU21-0008 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, the chiral superconductivity of the cosmic string in the axion
model has gathered attention. The superconductive nature can alter the standard
understanding of the cosmology of the axion model. For example, a string loop
with a sizable superconducting current can become a stable configuration, which
is called a Vorton. The superconductive nature can also affect the cosmological
evolution of the string network. In this paper, we study the stability of the
superconducting current in the string. We find the superconductivity is indeed
stable for a straight string or infinitely small string core size, even if the
carrier particles are unstable in the vacuum. However we also find that the
carrier particle decays in a curved string in typical axion models, if the
carrier particles are unstable in the vacuum. Accordingly, the lifetime of the
Vorton is not far from that of the carrier particle in the vacuum.
| [
{
"created": "Wed, 10 Feb 2021 13:09:27 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Feb 2021 10:27:31 GMT",
"version": "v2"
},
{
"created": "Sat, 29 May 2021 02:32:35 GMT",
"version": "v3"
}
] | 2023-01-11 | [
[
"Ibe",
"Masahiro",
""
],
[
"Kobayashi",
"Shin",
""
],
[
"Nakayama",
"Yuhei",
""
],
[
"Shirai",
"Satoshi",
""
]
] | Recently, the chiral superconductivity of the cosmic string in the axion model has gathered attention. The superconductive nature can alter the standard understanding of the cosmology of the axion model. For example, a string loop with a sizable superconducting current can become a stable configuration, which is called a Vorton. The superconductive nature can also affect the cosmological evolution of the string network. In this paper, we study the stability of the superconducting current in the string. We find the superconductivity is indeed stable for a straight string or infinitely small string core size, even if the carrier particles are unstable in the vacuum. However we also find that the carrier particle decays in a curved string in typical axion models, if the carrier particles are unstable in the vacuum. Accordingly, the lifetime of the Vorton is not far from that of the carrier particle in the vacuum. |
hep-ph/0305184 | Michael Eides | Michael I. Eides (University of Kentucky, USA, and Petersburg Nuclear
Physics Institute, Russia) and Valery A. Shelyuto (D. I. Mendeleev Institute
of Metrology, Russia) | New Polarization Operator Contributions to Lamb Shift and Hyperfine
Splitting | 21 pages, 14 figs | Phys.Rev. A68 (2003) 042106 | 10.1103/PhysRevA.68.042106 | UK/03-06 | hep-ph physics.atom-ph | null | We calculate radiative corrections to the Lamb shift of order
$\alpha^3(Z\alpha)^5m$ and radiative corrections to hyperfine splitting of
order $\alpha^3(Z\alpha)E_F$ generated by the diagrams with insertions of
radiative photons and electron polarization loops in the graphs with two
external photons. We also obtain the radiative-recoil correction to hyperfine
splitting in muonium generated by the diagrams with the $\tau$ polarization
loop.
| [
{
"created": "Fri, 16 May 2003 16:00:33 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Eides",
"Michael I.",
"",
"University of Kentucky, USA, and Petersburg Nuclear\n Physics Institute, Russia"
],
[
"Shelyuto",
"Valery A.",
"",
"D. I. Mendeleev Institute\n of Metrology, Russia"
]
] | We calculate radiative corrections to the Lamb shift of order $\alpha^3(Z\alpha)^5m$ and radiative corrections to hyperfine splitting of order $\alpha^3(Z\alpha)E_F$ generated by the diagrams with insertions of radiative photons and electron polarization loops in the graphs with two external photons. We also obtain the radiative-recoil correction to hyperfine splitting in muonium generated by the diagrams with the $\tau$ polarization loop. |
1807.11937 | Gilberto Colangelo | Gilberto Colangelo, Stefan Lanz, Heinrich Leutwyler and Emilie
Passemar | Dispersive analysis of $\mathbf\eta \rightarrow 3 \pi$ | 65 pages, 25 figures, version to appear on EPJC | null | null | JLAB-THY-18-2776 | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The dispersive analysis of the decay $\eta\to3\pi$ is reviewed and thoroughly
updated with the aim of determining the quark mass ratio
~$Q^2=(m_s^2-m_{ud}^2)/(m_d^2-m_u^2)$. With the number of subtractions we are
using, the effects generated by the final state interaction are dominated by
low energy $\pi\pi$ scattering. Since the corresponding phase shifts are now
accurately known, causality and unitarity determine the decay amplitude within
small uncertainties -- except for the values of the subtraction constants. Our
determination of these constants relies on the Dalitz plot distribution of the
charged channel, which is now measured with good accuracy. The theoretical
constraints that follow from the fact that the particles involved in the
transition represent Nambu-Goldstone bosons of a hidden approximate symmetry
play an equally important role. The ensuing predictions for the Dalitz plot
distribution of the neutral channel and for the branching ratio
$\Gamma_{\eta\to3\pi^0}/ \Gamma_{\eta\to\pi^+\pi^-\pi^0}$ are in very good
agreement with experiment. Relying on a known low-energy theorem that relates
the meson masses to the masses of the three lightest quarks, our analysis leads
to $Q=22.1(7)$, where the error covers all of the uncertainties encountered in
the course of the calculation: experimental uncertainties in decay rates and
Dalitz plot distributions, noise in the input used for the phase shifts, as
well as theoretical uncertainties in the constraints imposed by chiral symmetry
and in the evaluation of isospin breaking effects. Our result indicates that
the current algebra formulae for the meson masses only receive small
corrections from higher orders of the chiral expansion, but not all of the
recent lattice results are consistent with this conclusion.
| [
{
"created": "Tue, 31 Jul 2018 17:55:47 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Nov 2018 16:45:12 GMT",
"version": "v2"
}
] | 2018-11-20 | [
[
"Colangelo",
"Gilberto",
""
],
[
"Lanz",
"Stefan",
""
],
[
"Leutwyler",
"Heinrich",
""
],
[
"Passemar",
"Emilie",
""
]
] | The dispersive analysis of the decay $\eta\to3\pi$ is reviewed and thoroughly updated with the aim of determining the quark mass ratio ~$Q^2=(m_s^2-m_{ud}^2)/(m_d^2-m_u^2)$. With the number of subtractions we are using, the effects generated by the final state interaction are dominated by low energy $\pi\pi$ scattering. Since the corresponding phase shifts are now accurately known, causality and unitarity determine the decay amplitude within small uncertainties -- except for the values of the subtraction constants. Our determination of these constants relies on the Dalitz plot distribution of the charged channel, which is now measured with good accuracy. The theoretical constraints that follow from the fact that the particles involved in the transition represent Nambu-Goldstone bosons of a hidden approximate symmetry play an equally important role. The ensuing predictions for the Dalitz plot distribution of the neutral channel and for the branching ratio $\Gamma_{\eta\to3\pi^0}/ \Gamma_{\eta\to\pi^+\pi^-\pi^0}$ are in very good agreement with experiment. Relying on a known low-energy theorem that relates the meson masses to the masses of the three lightest quarks, our analysis leads to $Q=22.1(7)$, where the error covers all of the uncertainties encountered in the course of the calculation: experimental uncertainties in decay rates and Dalitz plot distributions, noise in the input used for the phase shifts, as well as theoretical uncertainties in the constraints imposed by chiral symmetry and in the evaluation of isospin breaking effects. Our result indicates that the current algebra formulae for the meson masses only receive small corrections from higher orders of the chiral expansion, but not all of the recent lattice results are consistent with this conclusion. |
1904.05129 | Michael Kachelrie{\ss} | M.Kachelriess, I.V.Moskalenko, S.Ostapchenko | AAfrag: Interpolation routines for Monte Carlo results on secondary
production in proton-proton, proton-nucleus and nucleus-nucleus interactions | 9 pages, 7 eps figures; v2: minor cosmetic changes, accepted version | Comp. Phys. Comm. 245, 106846 (2019) | 10.1016/j.cpc.2019.08.001 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide a compilation of predictions of the QGSJET-II-04m model for the
production of secondary species (photons, neutrinos, electrons, positrons, and
antinucleons) that are covering a wide range of energies of the beam particles
in proton-proton, proton-nucleus, nucleus-proton, and nucleus-nucleus
reactions. The current version of QGSJET-II-04m has an improved treatment of
the production of secondary particles at low energies: the parameters of the
hadronization procedure have been fine-tuned, based on a number of recent
benchmark experimental data, notably, from the LHCf, LHCb, and NA61
experiments. Our results for the production spectra are made publicly
accessible through the interpolation routines AAfrag which are described below.
Besides, we comment on the impact of Feynman scaling violation and isospin
symmetry effects on antinucleon production.
| [
{
"created": "Wed, 10 Apr 2019 12:10:40 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Aug 2019 20:04:13 GMT",
"version": "v2"
}
] | 2020-01-16 | [
[
"Kachelriess",
"M.",
""
],
[
"Moskalenko",
"I. V.",
""
],
[
"Ostapchenko",
"S.",
""
]
] | We provide a compilation of predictions of the QGSJET-II-04m model for the production of secondary species (photons, neutrinos, electrons, positrons, and antinucleons) that are covering a wide range of energies of the beam particles in proton-proton, proton-nucleus, nucleus-proton, and nucleus-nucleus reactions. The current version of QGSJET-II-04m has an improved treatment of the production of secondary particles at low energies: the parameters of the hadronization procedure have been fine-tuned, based on a number of recent benchmark experimental data, notably, from the LHCf, LHCb, and NA61 experiments. Our results for the production spectra are made publicly accessible through the interpolation routines AAfrag which are described below. Besides, we comment on the impact of Feynman scaling violation and isospin symmetry effects on antinucleon production. |
1601.07526 | Satomi Okada | Nobuchika Okada and Satomi Okada | $Z^\prime_{BL}$ portal dark matter and LHC Run-2 results | 17 pages, 5 figures, typographical errors corrected | Phys. Rev. D 93, 075003 (2016) | 10.1103/PhysRevD.93.075003 | YGHP16-03 | hep-ph astro-ph.CO hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a concise dark matter scenario in the minimal gauged $B-L$
extension of the Standard Model (SM), where the global $B-L$ (baryon number
minus lepton number) symmetry in the SM is gauged, and three generations of
right-handed neutrinos and a $B-L$ Higgs field are introduced. Associated with
the $B-L$ gauge symmetry breaking by a VEV of the $B-L$ Higgs field, the seesaw
mechanism for generating the neutrino mass is automatically implemented after
the electroweak symmetry breaking in the SM. In this model context, we
introduce a $Z_2$-parity and assign an odd parity for one right-handed neutrino
while even parities for the other fields. Therefore, the dark matter candidate
is identified as the right-handed Majorana neutrino with odd $Z_2$ parity,
keeping the minimality of the particle content intact. When the dark matter
particle communicates with the SM particles mainly through the $B-L$ gauge
boson ($Z^\prime_{BL}$ boson), its relic abundance is determined by only three
free parameters, the $B-L$ gauge coupling ($\alpha_{BL}$), the $Z^\prime_{BL}$
boson mass ($m_{Z^\prime}$) and the dark matter mass ($m_{DM}$). With the
cosmological upper bound on the dark matter relic abundance we find a lower
bound on $\alpha_{BL}$ as a function of $m_{Z^\prime}$. On the other hand, we
interpret the recent LHC Run-2 results on search for $Z^\prime$ boson resonance
to an upper bound on $\alpha_{BL}$ as a function of $m_{Z^\prime}$. Combining
the two results we identify an allowed parameter region for this
"$Z^\prime_{BL}$ portal" dark matter scenario, which turns out to be a narrow
window with the lower mass bound of $m_{Z^\prime} > 2.5$ TeV.
| [
{
"created": "Wed, 27 Jan 2016 20:15:16 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Feb 2016 07:49:31 GMT",
"version": "v2"
},
{
"created": "Tue, 12 Apr 2016 04:24:39 GMT",
"version": "v3"
},
{
"created": "Sun, 5 Feb 2017 05:45:28 GMT",
"version": "v4"
}
] | 2017-02-07 | [
[
"Okada",
"Nobuchika",
""
],
[
"Okada",
"Satomi",
""
]
] | We consider a concise dark matter scenario in the minimal gauged $B-L$ extension of the Standard Model (SM), where the global $B-L$ (baryon number minus lepton number) symmetry in the SM is gauged, and three generations of right-handed neutrinos and a $B-L$ Higgs field are introduced. Associated with the $B-L$ gauge symmetry breaking by a VEV of the $B-L$ Higgs field, the seesaw mechanism for generating the neutrino mass is automatically implemented after the electroweak symmetry breaking in the SM. In this model context, we introduce a $Z_2$-parity and assign an odd parity for one right-handed neutrino while even parities for the other fields. Therefore, the dark matter candidate is identified as the right-handed Majorana neutrino with odd $Z_2$ parity, keeping the minimality of the particle content intact. When the dark matter particle communicates with the SM particles mainly through the $B-L$ gauge boson ($Z^\prime_{BL}$ boson), its relic abundance is determined by only three free parameters, the $B-L$ gauge coupling ($\alpha_{BL}$), the $Z^\prime_{BL}$ boson mass ($m_{Z^\prime}$) and the dark matter mass ($m_{DM}$). With the cosmological upper bound on the dark matter relic abundance we find a lower bound on $\alpha_{BL}$ as a function of $m_{Z^\prime}$. On the other hand, we interpret the recent LHC Run-2 results on search for $Z^\prime$ boson resonance to an upper bound on $\alpha_{BL}$ as a function of $m_{Z^\prime}$. Combining the two results we identify an allowed parameter region for this "$Z^\prime_{BL}$ portal" dark matter scenario, which turns out to be a narrow window with the lower mass bound of $m_{Z^\prime} > 2.5$ TeV. |
2207.12273 | Ekta Chaubey | Ekta Chaubey | Analytic representations of two-loop scattering amplitudes with internal
masses | Loops and Legs in Quantum Field Theory conference | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We highlight the latest developments in computing higher-order scattering
amplitudes with massive internal propagators. The contributing Feynman
integrals often lead to special classes of functions, for example, functions
associated with elliptic curves. With the presence of more scales in the
amplitudes, it becomes imperative to have a better understanding of the
contributing Feynman integrals and using current cutting-edge technologies to
tackle the growth in analytic and algebraic complexities. In particular, we
start with discussing two-loop scattering amplitudes for top-quark pair
production and conclude with motivating important steps towards obtaining
next-to-next-to leading-order corrections for five-point processes.
| [
{
"created": "Mon, 25 Jul 2022 15:44:13 GMT",
"version": "v1"
}
] | 2022-07-26 | [
[
"Chaubey",
"Ekta",
""
]
] | We highlight the latest developments in computing higher-order scattering amplitudes with massive internal propagators. The contributing Feynman integrals often lead to special classes of functions, for example, functions associated with elliptic curves. With the presence of more scales in the amplitudes, it becomes imperative to have a better understanding of the contributing Feynman integrals and using current cutting-edge technologies to tackle the growth in analytic and algebraic complexities. In particular, we start with discussing two-loop scattering amplitudes for top-quark pair production and conclude with motivating important steps towards obtaining next-to-next-to leading-order corrections for five-point processes. |
hep-ph/9312278 | null | O.J.P. Eboli, M.C. Gonzalez-Garcia, A. Lopez-Fernandez, S.F. Novaes
and J.W.F. Valle | Searching for an Invisibly Decaying Higgs Boson in E^+E^-, E-Gamma, and
Gamma-Gamma Collisions | (LaTex file, 9 figures in postcript available upon request.
MAD/PH/810 | Nucl.Phys.B421:65-79,1994 | 10.1016/0550-3213(94)90224-0 | null | hep-ph | null | Higgs bosons can have a substantial ``invisible'' branching ratio in many
extensions of the Standard Model, such as models where the Higgs bosons decay
predominantly into light or massless weakly interacting Goldstone bosons. In
this work, we examine the production mechanisms and backgrounds for invisibly
decaying Higgs bosons at the Next Linear $e^+e^-$ Collider operating in the
modes $e^+e^-$, $e\gamma$, and $\gamma\gamma$. We demonstrate that such machine
is much more efficient to survey for invisibly decaying Higgs bosons than the
Large Hadron Collider at CERN.
| [
{
"created": "Tue, 14 Dec 1993 15:27:00 GMT",
"version": "v1"
}
] | 2009-09-17 | [
[
"Eboli",
"O. J. P.",
""
],
[
"Gonzalez-Garcia",
"M. C.",
""
],
[
"Lopez-Fernandez",
"A.",
""
],
[
"Novaes",
"S. F.",
""
],
[
"Valle",
"J. W. F.",
""
]
] | Higgs bosons can have a substantial ``invisible'' branching ratio in many extensions of the Standard Model, such as models where the Higgs bosons decay predominantly into light or massless weakly interacting Goldstone bosons. In this work, we examine the production mechanisms and backgrounds for invisibly decaying Higgs bosons at the Next Linear $e^+e^-$ Collider operating in the modes $e^+e^-$, $e\gamma$, and $\gamma\gamma$. We demonstrate that such machine is much more efficient to survey for invisibly decaying Higgs bosons than the Large Hadron Collider at CERN. |
1802.00944 | Amine Ahriche Dr. | Meziane Chekkal, Amine Ahriche, Amine Bouziane Hammou and Salah Nasri | Right-Handed Neutrinos: DM and LFV $vs$ Collider | 9 pages, 7 figures, 1 table. Talk given at "Les Rencontres de
Physique de la Vall\'ee d'Aoste: Results and Perspectives in Particle
Physics" 2017 | IL NUOVO CIMENTO 40 C (2017) 165 | 10.1393/ncc/i2017-17165-7 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a class of neutrino mass models with a lepton flavor violation (LFV)
Yukawa interaction term that involves a heavy right handed neutrino, a charged
scalar and a charged lepton, we investigate at the ILC@500 GeV the possibility
of observing news physics. These models can address neutrino mass and dark
matter without being in conflict with different LFV constraints. By imposing DM
relic density and LFV constraints, we recast the analysis done by L3
collaboration at LEP-II of monophoton searches on our space parameter and look
for new physics in such channels like monophoton and $S S(\gamma)$, where we
give different cuts and show the predicted distributions. We show also that
using polarized beams could improve the statistical significance.
| [
{
"created": "Sat, 3 Feb 2018 09:47:42 GMT",
"version": "v1"
}
] | 2018-02-06 | [
[
"Chekkal",
"Meziane",
""
],
[
"Ahriche",
"Amine",
""
],
[
"Hammou",
"Amine Bouziane",
""
],
[
"Nasri",
"Salah",
""
]
] | In a class of neutrino mass models with a lepton flavor violation (LFV) Yukawa interaction term that involves a heavy right handed neutrino, a charged scalar and a charged lepton, we investigate at the ILC@500 GeV the possibility of observing news physics. These models can address neutrino mass and dark matter without being in conflict with different LFV constraints. By imposing DM relic density and LFV constraints, we recast the analysis done by L3 collaboration at LEP-II of monophoton searches on our space parameter and look for new physics in such channels like monophoton and $S S(\gamma)$, where we give different cuts and show the predicted distributions. We show also that using polarized beams could improve the statistical significance. |
hep-ph/0510207 | Recai Erdem | Recai Erdem, Cem S. Un | Reconsidering extra time-like dimensions | The version to appear in EPJC | Eur.Phys.J.C47:845-850,2006 | 10.1140/epjc/s2006-02587-5 | IZTECH-P08-2005 | hep-ph gr-qc hep-th | null | In this study we reconsider the phenomenological problems related to
tachyonic modes in the context of extra time-like dimensions. First we
reconsider a lower bound on the size of extra time-like dimensions. Next we
discuss the issues of spontaneous decay of stable fermions through tachyonic
decays and disappearance of fermions due to tachyonic contributions to their
self-energies. We find that the tachyonic modes due to extra time-like
dimensions are less problematic than the tachyonic modes in the usual
4-dimensional setting because the most troublesome Feynman diagrams are
forbidden once the conservation of momentum in the extra time-like dimensions
is imposed.
| [
{
"created": "Sat, 15 Oct 2005 16:19:26 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Jul 2006 07:00:30 GMT",
"version": "v2"
}
] | 2009-01-07 | [
[
"Erdem",
"Recai",
""
],
[
"Un",
"Cem S.",
""
]
] | In this study we reconsider the phenomenological problems related to tachyonic modes in the context of extra time-like dimensions. First we reconsider a lower bound on the size of extra time-like dimensions. Next we discuss the issues of spontaneous decay of stable fermions through tachyonic decays and disappearance of fermions due to tachyonic contributions to their self-energies. We find that the tachyonic modes due to extra time-like dimensions are less problematic than the tachyonic modes in the usual 4-dimensional setting because the most troublesome Feynman diagrams are forbidden once the conservation of momentum in the extra time-like dimensions is imposed. |
2402.12449 | Vishal Singh Ngairangbam | Akanksha Bhardwaj, Christoph Englert, Wrishik Naskar, Vishal S.
Ngairangbam, and Michael Spannowsky | Equivariant, Safe and Sensitive -- Graph Networks for New Physics | 15 pages, 3 figures, 1 table | null | null | IPPP/24/07 | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | This study introduces a novel Graph Neural Network (GNN) architecture that
leverages infrared and collinear (IRC) safety and equivariance to enhance the
analysis of collider data for Beyond the Standard Model (BSM) discoveries. By
integrating equivariance in the rapidity-azimuth plane with IRC-safe
principles, our model significantly reduces computational overhead while
ensuring theoretical consistency in identifying BSM scenarios amidst Quantum
Chromodynamics backgrounds. The proposed GNN architecture demonstrates superior
performance in tagging semi-visible jets, highlighting its potential as a
robust tool for advancing BSM search strategies at high-energy colliders.
| [
{
"created": "Mon, 19 Feb 2024 19:00:09 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Mar 2024 10:50:12 GMT",
"version": "v2"
}
] | 2024-03-04 | [
[
"Bhardwaj",
"Akanksha",
""
],
[
"Englert",
"Christoph",
""
],
[
"Naskar",
"Wrishik",
""
],
[
"Ngairangbam",
"Vishal S.",
""
],
[
"Spannowsky",
"Michael",
""
]
] | This study introduces a novel Graph Neural Network (GNN) architecture that leverages infrared and collinear (IRC) safety and equivariance to enhance the analysis of collider data for Beyond the Standard Model (BSM) discoveries. By integrating equivariance in the rapidity-azimuth plane with IRC-safe principles, our model significantly reduces computational overhead while ensuring theoretical consistency in identifying BSM scenarios amidst Quantum Chromodynamics backgrounds. The proposed GNN architecture demonstrates superior performance in tagging semi-visible jets, highlighting its potential as a robust tool for advancing BSM search strategies at high-energy colliders. |
2203.02299 | Aleksandr Mikheev | Aleksandr N. Mikheev, Aleksas Mazeliauskas, and J\"urgen Berges | Stability analysis of non-thermal fixed points in longitudinally
expanding kinetic theory | 9 pages, 2 figures. Minor changes, published version | Phys. Rev. D 105, 116025 (2022) | 10.1103/PhysRevD.105.116025 | CERN-TH-2022-030 | hep-ph cond-mat.quant-gas nucl-th | http://creativecommons.org/licenses/by/4.0/ | We use the Hamiltonian formulation of kinetic theory to perform a stability
analysis of non-thermal fixed points in a non-Abelian plasma. We construct a
perturbative expansion of the Fokker-Planck collision kernel in an adiabatic
approximation and show that the (next-to-)leading order solutions reproduce the
known non-thermal fixed point scaling exponents. Working at next-to-leading
order, we derive the stability equations for scaling exponents and find the
relaxation rate to the non-thermal fixed point. This approach provides the
basis for an understanding of the prescaling phenomena observed in QCD kinetic
theory and non-relativistic Bose gas systems.
| [
{
"created": "Fri, 4 Mar 2022 13:16:04 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Jun 2022 18:13:50 GMT",
"version": "v2"
}
] | 2022-07-01 | [
[
"Mikheev",
"Aleksandr N.",
""
],
[
"Mazeliauskas",
"Aleksas",
""
],
[
"Berges",
"Jürgen",
""
]
] | We use the Hamiltonian formulation of kinetic theory to perform a stability analysis of non-thermal fixed points in a non-Abelian plasma. We construct a perturbative expansion of the Fokker-Planck collision kernel in an adiabatic approximation and show that the (next-to-)leading order solutions reproduce the known non-thermal fixed point scaling exponents. Working at next-to-leading order, we derive the stability equations for scaling exponents and find the relaxation rate to the non-thermal fixed point. This approach provides the basis for an understanding of the prescaling phenomena observed in QCD kinetic theory and non-relativistic Bose gas systems. |
1712.00033 | Jo\~ao Moreira | J. Moreira, J. Morais, B. Hiller, A. A. Osipov and A. H. Blin | Strongly Interacting Matter Phase Diagram in the presence of Magnetic
Fields in an Extended Effective Lagrangian Approach with Explicit Chiral
Symmetry Breaking Interactions | Submitted for the proceedings of Hadron 2017 -XVII International
Conference on Hadron Spectroscopy and Structure, September 25th-29th 2017,
Salamanca, Spain | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Extensions of the NJL model which go beyond the original 4-quark interaction,
which drives the dynamical mass generation, have proven to be quite successful
in describing low energy hadronic phenomenology. The inclusion of 8-quark
interaction terms solved a metastability problem of the effective potential
introduced by the inclusion of the 6-quark 't Hooft determinant term in the
3-flavor version of the model (needed to eliminate the unwanted U(1) axial
symmetry) . This model, that has proven to be quite powerful and feature-rich,
has been expanded to include all the spin-0 terms, without and with explicit
chiral symmetry breaking, which are of the same order as the 't Hooft flavor
determinant in a 1/Nc expansion resulting in an unprecedented success in
reproducing the low lying scalar and pseudoscalar meson spectra. This success
can be seen as a result of the inclusion of the full chiral symmetry breaking
pattern. The two critical endpoints which are obtained in the
temperature/chemical potential phase diagram are shifted to lower chemical
potential and higher temperature when the effect of magnetic field is taken
into account. For the studied magnetic field strengths (in the range
$eH=0-0.4~GeV^2$) no significant extra transitions are seen to appear.
| [
{
"created": "Thu, 30 Nov 2017 19:10:55 GMT",
"version": "v1"
}
] | 2017-12-04 | [
[
"Moreira",
"J.",
""
],
[
"Morais",
"J.",
""
],
[
"Hiller",
"B.",
""
],
[
"Osipov",
"A. A.",
""
],
[
"Blin",
"A. H.",
""
]
] | Extensions of the NJL model which go beyond the original 4-quark interaction, which drives the dynamical mass generation, have proven to be quite successful in describing low energy hadronic phenomenology. The inclusion of 8-quark interaction terms solved a metastability problem of the effective potential introduced by the inclusion of the 6-quark 't Hooft determinant term in the 3-flavor version of the model (needed to eliminate the unwanted U(1) axial symmetry) . This model, that has proven to be quite powerful and feature-rich, has been expanded to include all the spin-0 terms, without and with explicit chiral symmetry breaking, which are of the same order as the 't Hooft flavor determinant in a 1/Nc expansion resulting in an unprecedented success in reproducing the low lying scalar and pseudoscalar meson spectra. This success can be seen as a result of the inclusion of the full chiral symmetry breaking pattern. The two critical endpoints which are obtained in the temperature/chemical potential phase diagram are shifted to lower chemical potential and higher temperature when the effect of magnetic field is taken into account. For the studied magnetic field strengths (in the range $eH=0-0.4~GeV^2$) no significant extra transitions are seen to appear. |
1705.00598 | Marek Sch\"onherr | S. Kallweit, J. M. Lindert, S. Pozzorini, M. Schonherr | NLO QCD+EW predictions for $2\ell2\nu$ diboson signatures at the LHC | 25 pages + appendices, 22 figures | JHEP 1711 (2017) 120 | 10.1007/JHEP11(2017)120 | IPPP/17/32, MCNET--17--05, CERN-TH-2017-097, ZU-TH 09/17 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present next-to-leading order (NLO) calculations including QCD and
electroweak (EW) corrections for $2\ell2\nu$ diboson signatures with two
opposite-charge leptons and two neutrinos. Specifically, we study the processes
$pp\to e^+ \mu^- \nu_{e}\bar\nu_{\mu}$ and $pp\to e^+ e^-\nu\bar\nu$, including
all relevant off-shell diboson channels, $W^+W^-$, $ZZ$, $\gamma Z$, as well as
non-resonant contributions. Photon-induced processes are computed at NLO EW,
and we discuss subtle differences related to the definition and the
renormalisation of the coupling $\alpha$ for processes with initial- and
final-state photons. All calculations are performed within the automated
Munich/Sherpa+OpenLoops frameworks, and we provide numerical predictions for
the LHC at 13 TeV. The behaviour of the corrections is investigated with
emphasis on the high-energy regime, where NLO EW effects can amount to tens of
percent due to large Sudakov logarithms. The interplay between $WW$ and $ZZ$
contributions to the same-flavour channel, $pp\to e^+ e^-\nu\bar\nu$, is
discussed in detail, and a quantitative analysis of photon-induced
contributions is presented. Finally, we consider approximations that account
for all sources of large logarithms, at high and low energy, by combining
virtual EW corrections with a YFS soft-photon resummation or a QED parton
shower.
| [
{
"created": "Mon, 1 May 2017 17:29:02 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Dec 2017 13:21:04 GMT",
"version": "v2"
}
] | 2017-12-25 | [
[
"Kallweit",
"S.",
""
],
[
"Lindert",
"J. M.",
""
],
[
"Pozzorini",
"S.",
""
],
[
"Schonherr",
"M.",
""
]
] | We present next-to-leading order (NLO) calculations including QCD and electroweak (EW) corrections for $2\ell2\nu$ diboson signatures with two opposite-charge leptons and two neutrinos. Specifically, we study the processes $pp\to e^+ \mu^- \nu_{e}\bar\nu_{\mu}$ and $pp\to e^+ e^-\nu\bar\nu$, including all relevant off-shell diboson channels, $W^+W^-$, $ZZ$, $\gamma Z$, as well as non-resonant contributions. Photon-induced processes are computed at NLO EW, and we discuss subtle differences related to the definition and the renormalisation of the coupling $\alpha$ for processes with initial- and final-state photons. All calculations are performed within the automated Munich/Sherpa+OpenLoops frameworks, and we provide numerical predictions for the LHC at 13 TeV. The behaviour of the corrections is investigated with emphasis on the high-energy regime, where NLO EW effects can amount to tens of percent due to large Sudakov logarithms. The interplay between $WW$ and $ZZ$ contributions to the same-flavour channel, $pp\to e^+ e^-\nu\bar\nu$, is discussed in detail, and a quantitative analysis of photon-induced contributions is presented. Finally, we consider approximations that account for all sources of large logarithms, at high and low energy, by combining virtual EW corrections with a YFS soft-photon resummation or a QED parton shower. |
1311.2188 | Salah Nasri | Cherif Hamzaoui, Salah Nasri, Manuel Toharia | Partial $\mu-\tau$ Textures and Leptogenesis | 18 pages. Few typos fixed and included more figures in the
leptogenesis section with some discussion | Phys. Rev. D 89, 073019 (2014) | 10.1103/PhysRevD.89.073019 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by the recent results from Daya Bay, Reno and Double Chooz
Collaborations, we study the consequences of small departures from exact
$\mu-\tau$ symmetry in the neutrino sector, to accommodate a non-vanishing
value of the element $V_{e3}$ from the leptonic mixing matrix. Within the
see-saw framework, we identify simple patterns of Dirac mass matrices that lead
to approximate $\mu-\tau$ symmetric neutrino mass matrices, which are
consistent with the neutrino oscillation data and lead to non-vanishing mixing
angle $V_{e3}$ as well as precise predictions for the CP violating phases. We
also show that there is a transparent link between neutrino mixing angles and
see-saw parameters, which we further explore within the context of leptogenesis
as well as double beta decay phenomenology.
| [
{
"created": "Sat, 9 Nov 2013 17:05:22 GMT",
"version": "v1"
},
{
"created": "Sat, 10 May 2014 17:46:34 GMT",
"version": "v2"
}
] | 2014-05-13 | [
[
"Hamzaoui",
"Cherif",
""
],
[
"Nasri",
"Salah",
""
],
[
"Toharia",
"Manuel",
""
]
] | Motivated by the recent results from Daya Bay, Reno and Double Chooz Collaborations, we study the consequences of small departures from exact $\mu-\tau$ symmetry in the neutrino sector, to accommodate a non-vanishing value of the element $V_{e3}$ from the leptonic mixing matrix. Within the see-saw framework, we identify simple patterns of Dirac mass matrices that lead to approximate $\mu-\tau$ symmetric neutrino mass matrices, which are consistent with the neutrino oscillation data and lead to non-vanishing mixing angle $V_{e3}$ as well as precise predictions for the CP violating phases. We also show that there is a transparent link between neutrino mixing angles and see-saw parameters, which we further explore within the context of leptogenesis as well as double beta decay phenomenology. |
hep-ph/0007345 | null | G. Gabadadze, M. Shifman | Vacuum Structure and the Axion Walls in Gluodynamics and QCD with Light
Quarks | 22 pages Latex, no figures | Phys.Rev. D62 (2000) 114003 | 10.1103/PhysRevD.62.114003 | NYU-TH/00/05/05, TPI-MINN-16/00, UMN-TH-1850/00 | hep-ph hep-th | null | Large N gluodynamics was shown to have a set of metastable vacua with the
gluonic domain walls interpolating between them. The walls may separate the
genuine vacuum from an excited one, or two excited vacua which are unstable at
finite N (here N is the number of colors). One may attempt to stabilize them by
switching on the axion field. We study how the light quarks and the axion
affect the structure of the domain walls. In pure gluodynamics (with the axion
field) the axion walls acquire a very hard gluonic core. Thus, we deal with a
wall "sandwich" which is stable at finite N. In the case of the minimal axion,
the wall "sandwich" is in fact a "2-pi" wall, i.e., the corresponding field
configuration interpolates between identical hadronic vacua. The same
properties hold in QCD with three light quarks and very large number of colors.
However, in the realistic case of three-color QCD the phase corresponding to
the axion field profile in the axion wall is screened by a dynamical phase
associated with the eta-prime, so that the gluon component of the wall is not
excited. We propose a toy Lagrangian which models these properties and allows
one to get exact solutions for the domain walls.
| [
{
"created": "Fri, 28 Jul 2000 23:55:49 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Gabadadze",
"G.",
""
],
[
"Shifman",
"M.",
""
]
] | Large N gluodynamics was shown to have a set of metastable vacua with the gluonic domain walls interpolating between them. The walls may separate the genuine vacuum from an excited one, or two excited vacua which are unstable at finite N (here N is the number of colors). One may attempt to stabilize them by switching on the axion field. We study how the light quarks and the axion affect the structure of the domain walls. In pure gluodynamics (with the axion field) the axion walls acquire a very hard gluonic core. Thus, we deal with a wall "sandwich" which is stable at finite N. In the case of the minimal axion, the wall "sandwich" is in fact a "2-pi" wall, i.e., the corresponding field configuration interpolates between identical hadronic vacua. The same properties hold in QCD with three light quarks and very large number of colors. However, in the realistic case of three-color QCD the phase corresponding to the axion field profile in the axion wall is screened by a dynamical phase associated with the eta-prime, so that the gluon component of the wall is not excited. We propose a toy Lagrangian which models these properties and allows one to get exact solutions for the domain walls. |
1902.02273 | Sergi Gonz\`alez-Sol\'is | Sergi Gonz\`alez-Sol\'is, Pablo Roig | A dispersive analysis of the pion vector form factor and $\tau^{-}\to
K^{-}K_{S}\nu_{\tau}$ decay | 35 pages, 8 figures, 2 ancillary files | null | 10.1140/epjc/s10052-019-6943-9 | null | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore the potential of a combined analysis of the decays
$\tau^{-}\to\pi^{-}\pi^{0}\nu_{\tau}$ and $\tau^{-}\to K^{-}K_{S}\nu_{\tau}$ in
the determination of the $\rho(1450)$ and $\rho(1700)$ resonance properties in
the frame of resonance Chiral Theory supplemented by dispersion relations. On
the one hand, we take advantage of the very precise data on the modulus squared
of the pion vector form factor $|F_{V}^{\pi}|^{2}$ obtained by Belle to carry
out a very dedicated analysis of the region where these resonances come up into
play. Our study provides an improved treatment of the systematic theoretical
errors and, as a most important result, we conclude that they dominate over the
fit uncertainties in the determination of the $\rho(1450)$ and $\rho(1700)$
pole parameters and tend to be larger than in other determinations quoted in
the literature where these errors were ignored or underestimated. The results
of our analysis are summarized in numerical tables for the form factor modulus
and phase, including both statistical and systematic errors, that can be found
as ancillary material of this paper. As a byproduct, we also determine the
low-energy observables of the pion vector form factor and the $\rho$-pole
position. On the other hand, we benefit from the recent experimental data for
the transition $\tau^{-}\to K^{-}K_{S}\nu_{\tau}$ released by BaBar to perform
a first analysis of its decay spectrum and discuss the role of these resonances
in this decay. We point out that higher-quality data on the $K^{-}K_{S}$ decay
channel will allow compete with the $|F_{V}^{\pi}|^{2}$ ones and improve the
determination of the $\rho(1450)$ and $\rho(1700)$ resonance parameters as a
result of a combined analysis. We hope our study to be of interest for present
and future experimental analysis of these decays.
| [
{
"created": "Wed, 6 Feb 2019 17:01:32 GMT",
"version": "v1"
}
] | 2019-06-26 | [
[
"Gonzàlez-Solís",
"Sergi",
""
],
[
"Roig",
"Pablo",
""
]
] | We explore the potential of a combined analysis of the decays $\tau^{-}\to\pi^{-}\pi^{0}\nu_{\tau}$ and $\tau^{-}\to K^{-}K_{S}\nu_{\tau}$ in the determination of the $\rho(1450)$ and $\rho(1700)$ resonance properties in the frame of resonance Chiral Theory supplemented by dispersion relations. On the one hand, we take advantage of the very precise data on the modulus squared of the pion vector form factor $|F_{V}^{\pi}|^{2}$ obtained by Belle to carry out a very dedicated analysis of the region where these resonances come up into play. Our study provides an improved treatment of the systematic theoretical errors and, as a most important result, we conclude that they dominate over the fit uncertainties in the determination of the $\rho(1450)$ and $\rho(1700)$ pole parameters and tend to be larger than in other determinations quoted in the literature where these errors were ignored or underestimated. The results of our analysis are summarized in numerical tables for the form factor modulus and phase, including both statistical and systematic errors, that can be found as ancillary material of this paper. As a byproduct, we also determine the low-energy observables of the pion vector form factor and the $\rho$-pole position. On the other hand, we benefit from the recent experimental data for the transition $\tau^{-}\to K^{-}K_{S}\nu_{\tau}$ released by BaBar to perform a first analysis of its decay spectrum and discuss the role of these resonances in this decay. We point out that higher-quality data on the $K^{-}K_{S}$ decay channel will allow compete with the $|F_{V}^{\pi}|^{2}$ ones and improve the determination of the $\rho(1450)$ and $\rho(1700)$ resonance parameters as a result of a combined analysis. We hope our study to be of interest for present and future experimental analysis of these decays. |
hep-ph/0306121 | Simon Dalley | S. Dalley | Impact parameter dependent quark distribution of the pion | 9 pages, 2 figures, LaTeX | Phys.Lett.B570:191-197,2003 | 10.1016/j.physletb.2003.07.052 | SWAT/376 | hep-ph nucl-th | null | We present first results for the impact parameter dependent quark
distribution in the pion obtained in transverse lattice gauge theory, and
discuss recent predictions from other models.
| [
{
"created": "Fri, 13 Jun 2003 13:38:02 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Jun 2003 13:12:09 GMT",
"version": "v2"
},
{
"created": "Wed, 23 Jul 2003 14:34:24 GMT",
"version": "v3"
}
] | 2011-07-19 | [
[
"Dalley",
"S.",
""
]
] | We present first results for the impact parameter dependent quark distribution in the pion obtained in transverse lattice gauge theory, and discuss recent predictions from other models. |
hep-ph/9411375 | null | Jaume Garriga and Tanmay Vachaspati | Zero Modes on Linked Strings | LaTeX, 27 text pages + 2 figures, Fig. 1 file fixed | Nucl.Phys. B438 (1995) 161-181 | 10.1016/0550-3213(95)00012-H | null | hep-ph gr-qc hep-th | null | We study linked loops of string in the presence of bosonic condensates and
fermionic zero modes on the strings. We find that the strings necessarily carry
a current if the bosons have an Aharanov-Bohm interaction with the string. The
fermionic case is analyzed in the context of the standard model where there are
lepton and quark zero modes on $Z-$strings. Here we find that the fermionic
ground state in the linked string background is lower than the ground state
when the loops are unlinked but otherwise identical. As in the bosonic case,
the $Z-$strings carry a non-vanishing electric current in the ground state. The
baryon number of the linked configuration is found to agree with previous
indirect results. We also evaluate the angular momentum, electromagnetic charge
and baryonic three current on the linked $Z-$string configuration. Finally we
point out a possible gravitational analogue of the linked string system.
| [
{
"created": "Wed, 23 Nov 1994 15:20:00 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Nov 1994 11:07:00 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Garriga",
"Jaume",
""
],
[
"Vachaspati",
"Tanmay",
""
]
] | We study linked loops of string in the presence of bosonic condensates and fermionic zero modes on the strings. We find that the strings necessarily carry a current if the bosons have an Aharanov-Bohm interaction with the string. The fermionic case is analyzed in the context of the standard model where there are lepton and quark zero modes on $Z-$strings. Here we find that the fermionic ground state in the linked string background is lower than the ground state when the loops are unlinked but otherwise identical. As in the bosonic case, the $Z-$strings carry a non-vanishing electric current in the ground state. The baryon number of the linked configuration is found to agree with previous indirect results. We also evaluate the angular momentum, electromagnetic charge and baryonic three current on the linked $Z-$string configuration. Finally we point out a possible gravitational analogue of the linked string system. |
hep-ph/0703287 | Sherstnev Alexander | S. Belov, L. Dudko, E. Galkin, A. Gusev, W. Pokorski, A. Sherstnev | LCG MCDB -- a Knowledgebase of Monte Carlo Simulated Events | null | Comput.Phys.Commun.178:222-229,2008 | 10.1016/j.cpc.2007.08.010 | null | hep-ph | null | In this paper we report on LCG Monte Carlo Data Base (MCDB) and software
which has been developed to operate MCDB. The main purpose of the LCG MCDB
project is to provide a storage and documentation system for sophisticated
event samples simulated for the LHC collaborations by experts. In many cases,
the modern Monte Carlo simulation of physical processes requires expert
knowledge in Monte Carlo generators or significant amount of CPU time to
produce the events. MCDB is a knowledgebase mainly dedicated to accumulate
simulated events of this type. The main motivation behind LCG MCDB is to make
the sophisticated MC event samples available for various physical groups. All
the data from MCDB is accessible in several convenient ways. LCG MCDB is being
developed within the CERN LCG Application Area Simulation project.
| [
{
"created": "Tue, 27 Mar 2007 18:03:19 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Mar 2007 09:15:35 GMT",
"version": "v2"
},
{
"created": "Fri, 9 Nov 2007 10:58:28 GMT",
"version": "v3"
},
{
"created": "Thu, 10 Jan 2008 10:36:56 GMT",
"version": "v4"
}
] | 2011-04-11 | [
[
"Belov",
"S.",
""
],
[
"Dudko",
"L.",
""
],
[
"Galkin",
"E.",
""
],
[
"Gusev",
"A.",
""
],
[
"Pokorski",
"W.",
""
],
[
"Sherstnev",
"A.",
""
]
] | In this paper we report on LCG Monte Carlo Data Base (MCDB) and software which has been developed to operate MCDB. The main purpose of the LCG MCDB project is to provide a storage and documentation system for sophisticated event samples simulated for the LHC collaborations by experts. In many cases, the modern Monte Carlo simulation of physical processes requires expert knowledge in Monte Carlo generators or significant amount of CPU time to produce the events. MCDB is a knowledgebase mainly dedicated to accumulate simulated events of this type. The main motivation behind LCG MCDB is to make the sophisticated MC event samples available for various physical groups. All the data from MCDB is accessible in several convenient ways. LCG MCDB is being developed within the CERN LCG Application Area Simulation project. |
2405.18466 | Hugo Sch\'erer | Hugo Sch\'erer, Katelin Schutz | Photon self-energy at all temperatures and densities in all of phase
space | 13 pages, 4 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In an isotropic background comprised of free charges, the transverse and
longitudinal modes of the photon acquire large corrections to their dispersion
relations, described by the in-medium photon self-energy. Previous work has
developed simple approximations that describe the propagation of on-shell
photons in plasmas of varying temperatures and densities. However, off-shell
excitations can also receive large medium-induced corrections, and the on-shell
approximations have often been used in an effort to capture these effects. In
this work we show that the off-shell self-energy can be qualitatively very
different than the on-shell case. We develop analytic approximations that are
accurate everywhere in phase space, especially in classical and degenerate
plasmas. From these, we recover the on-shell expressions in the appropriate
limit. Our expressions also reproduce the well-known Lindhard response function
from solid-state physics for the longitudinal mode.
| [
{
"created": "Tue, 28 May 2024 18:00:00 GMT",
"version": "v1"
}
] | 2024-05-30 | [
[
"Schérer",
"Hugo",
""
],
[
"Schutz",
"Katelin",
""
]
] | In an isotropic background comprised of free charges, the transverse and longitudinal modes of the photon acquire large corrections to their dispersion relations, described by the in-medium photon self-energy. Previous work has developed simple approximations that describe the propagation of on-shell photons in plasmas of varying temperatures and densities. However, off-shell excitations can also receive large medium-induced corrections, and the on-shell approximations have often been used in an effort to capture these effects. In this work we show that the off-shell self-energy can be qualitatively very different than the on-shell case. We develop analytic approximations that are accurate everywhere in phase space, especially in classical and degenerate plasmas. From these, we recover the on-shell expressions in the appropriate limit. Our expressions also reproduce the well-known Lindhard response function from solid-state physics for the longitudinal mode. |
0909.4812 | Gregory Moreau | Charles Bouchart and Gregory Moreau | Higgs boson phenomenology and VEV shift in the RS scenario | Latex file, 37 pages, 4 figures, 1 table | Phys.Rev.D80:095022,2009 | 10.1103/PhysRevD.80.095022 | LPT-ORSAY-09-70 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the framework of warped extra dimension models addressing the gauge
hierarchy problem, we consider the Randall-Sundrum (RS) scenario under the
usual hypothesis of a bulk custodial symmetry. It is shown in detail that there
can exist large corrections to the Higgs boson Vacuum Expectation Value (VEV)
induced by mixings of the gauge bosons with their Kaluza-Klein (KK)
excitations. The connection with electroweak precision tests is developed. A
noteworthy result is that the correct treatment of the Higgs VEV leads to an
increase of the lower limit at 95% C.L. on KK masses that can reach +30% (from
usually accepted values). For a Higgs mass 120 GeV < m_h < 150 GeV, the
obtained limit [from updated precision data] on the first KK gauge boson mass
lies in the range 3.3 - 4.0 TeV. The VEV corrections also play a central role
in the corrections to the Higgs couplings. We find possibly substantial RS
corrections to the various Higgs couplings able to affect its phenomenology,
starting with a Higgs discovery at LHC more challenging than in the Standard
Model (SM). The deviations to the Higgs production/decay rates found in RS will
be testable at ILC as well as at LHC. Such RS signatures could even be used at
ILC to discriminate among several models beyond the SM. Finally, the
possibility of a light Higgs boson (m_h ~ 99 GeV) interpreting the excess at
2.3 Sigma observed at LEP2 is pointed out.
| [
{
"created": "Fri, 25 Sep 2009 22:24:17 GMT",
"version": "v1"
}
] | 2011-01-13 | [
[
"Bouchart",
"Charles",
""
],
[
"Moreau",
"Gregory",
""
]
] | In the framework of warped extra dimension models addressing the gauge hierarchy problem, we consider the Randall-Sundrum (RS) scenario under the usual hypothesis of a bulk custodial symmetry. It is shown in detail that there can exist large corrections to the Higgs boson Vacuum Expectation Value (VEV) induced by mixings of the gauge bosons with their Kaluza-Klein (KK) excitations. The connection with electroweak precision tests is developed. A noteworthy result is that the correct treatment of the Higgs VEV leads to an increase of the lower limit at 95% C.L. on KK masses that can reach +30% (from usually accepted values). For a Higgs mass 120 GeV < m_h < 150 GeV, the obtained limit [from updated precision data] on the first KK gauge boson mass lies in the range 3.3 - 4.0 TeV. The VEV corrections also play a central role in the corrections to the Higgs couplings. We find possibly substantial RS corrections to the various Higgs couplings able to affect its phenomenology, starting with a Higgs discovery at LHC more challenging than in the Standard Model (SM). The deviations to the Higgs production/decay rates found in RS will be testable at ILC as well as at LHC. Such RS signatures could even be used at ILC to discriminate among several models beyond the SM. Finally, the possibility of a light Higgs boson (m_h ~ 99 GeV) interpreting the excess at 2.3 Sigma observed at LEP2 is pointed out. |
1711.03680 | Jose Alonso Carpio Dumler | Jose Carpio, E. Massoni and A.M. Gago | Revisiting quantum decoherence for neutrino oscillations in constant
matter density | 12 pages, 5 figures. Accepted for publication in PRD | Phys. Rev. D 97, 115017 (2018) | 10.1103/PhysRevD.97.115017 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We re-examine the matter neutrino oscillation probabilities considering the
decoherence phenomenon as a sub-leading effect. In this paper we point out the
relevance of having the correct interpretation of the decoherence matrix in the
different quantum bases, within the framework of neutrino oscillation
probabilities in matter. Based on this treatment we develop an analytical
formula for matter neutrino oscillation probabilities for three generations,
with a range of application up to the decoherence parameter $\Gamma \sim
10^{-23}$ GeV. We observe that, due to decoherence, the amplitudes of the
neutrino/antineutrino oscillation probabilities increase in an energy
independent way. We also find that decoherence can reduce the absolute value of
the CP asymmetry, relative to its value at the pure oscillation case. As a side
effect we have found a degeneracy between the decoherence parameter $\Gamma$
and the CP violation phase $\delta$.
| [
{
"created": "Fri, 10 Nov 2017 03:57:13 GMT",
"version": "v1"
},
{
"created": "Sun, 27 May 2018 06:07:02 GMT",
"version": "v2"
},
{
"created": "Tue, 19 May 2020 04:05:43 GMT",
"version": "v3"
}
] | 2020-05-20 | [
[
"Carpio",
"Jose",
""
],
[
"Massoni",
"E.",
""
],
[
"Gago",
"A. M.",
""
]
] | We re-examine the matter neutrino oscillation probabilities considering the decoherence phenomenon as a sub-leading effect. In this paper we point out the relevance of having the correct interpretation of the decoherence matrix in the different quantum bases, within the framework of neutrino oscillation probabilities in matter. Based on this treatment we develop an analytical formula for matter neutrino oscillation probabilities for three generations, with a range of application up to the decoherence parameter $\Gamma \sim 10^{-23}$ GeV. We observe that, due to decoherence, the amplitudes of the neutrino/antineutrino oscillation probabilities increase in an energy independent way. We also find that decoherence can reduce the absolute value of the CP asymmetry, relative to its value at the pure oscillation case. As a side effect we have found a degeneracy between the decoherence parameter $\Gamma$ and the CP violation phase $\delta$. |
1904.10954 | Tyler Corbett | B.C. Allanach, J.M. Butterworth, Tyler Corbett | Collider Constraints on $Z^\prime$ Models for Neutral Current
$B-$Anomalies | 22 pages, 8 figures. Updated to include more accurate version of
cross-section, including off-shell Z' effects | null | 10.1007/JHEP08(2019)106 | MCnet-19-08 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine current collider constraints on some simple $Z^\prime$ models that
fit neutral current $B-$anomalies, including constraints coming from
measurements of Standard Model (SM) signatures at the LHC. The `MDM' simplified
model is not constrained by the SM measurements but {\em is} strongly
constrained by a 139 fb$^{-1}$ 13 TeV ATLAS di-muon search. Constraints upon
the `MUM' simplified model are much weaker. A combination of the current $B_s$
mixing constraint and ATLAS' $Z^\prime$ search implies $M_{Z^\prime}>1.2$ TeV
in the Third Family Hypercharge Model example case. LHC SM measurements rule
out a portion of the parameter space of the model for $M_{Z^\prime}<1.5$ TeV.
| [
{
"created": "Wed, 24 Apr 2019 17:59:50 GMT",
"version": "v1"
},
{
"created": "Wed, 1 May 2019 16:11:26 GMT",
"version": "v2"
},
{
"created": "Tue, 2 Jul 2019 11:40:50 GMT",
"version": "v3"
},
{
"created": "Tue, 6 Aug 2019 14:57:21 GMT",
"version": "v4"
},
{
"crea... | 2020-01-29 | [
[
"Allanach",
"B. C.",
""
],
[
"Butterworth",
"J. M.",
""
],
[
"Corbett",
"Tyler",
""
]
] | We examine current collider constraints on some simple $Z^\prime$ models that fit neutral current $B-$anomalies, including constraints coming from measurements of Standard Model (SM) signatures at the LHC. The `MDM' simplified model is not constrained by the SM measurements but {\em is} strongly constrained by a 139 fb$^{-1}$ 13 TeV ATLAS di-muon search. Constraints upon the `MUM' simplified model are much weaker. A combination of the current $B_s$ mixing constraint and ATLAS' $Z^\prime$ search implies $M_{Z^\prime}>1.2$ TeV in the Third Family Hypercharge Model example case. LHC SM measurements rule out a portion of the parameter space of the model for $M_{Z^\prime}<1.5$ TeV. |
hep-ph/0011315 | Andrei Ivanov | A. Ya. Berdnikov, Ya. A. Berdnikov, A. N. Ivanov, V. F. Kosmach, M. D.
Scadron, and N. I. Troitskaya | On the reactions p + p -> p + Lambda + K^+ and p + p -> p + Sigma^0 +
K^+ near thresholds | 15 pages, 1 Postscript figure, Latex, to appear in Eur. Phys. JA | Eur.Phys.J. A9 (2000) 425-432 | 10.1007/s100500070027 | null | hep-ph | null | The cross sections for the reactions of the strange production p + p -> p +
Lambda + K^+ and p + p -> p + Sigma^0 + K^+ near thresholds of the final states
p Lambda K^+ and p Sigma^0 K^+ are calculated in the effective Lagrangian
approach. Our approach is based on the dominant contribution of the one-pion
exchange and strong interaction of the colliding protons in the initial state.
The theoretical values of the cross sections agree reasonably well with the
experimental data. The polarization properties of the Lambda and Sigma^0
hyperons are discussed.
| [
{
"created": "Sat, 25 Nov 2000 12:18:34 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Berdnikov",
"A. Ya.",
""
],
[
"Berdnikov",
"Ya. A.",
""
],
[
"Ivanov",
"A. N.",
""
],
[
"Kosmach",
"V. F.",
""
],
[
"Scadron",
"M. D.",
""
],
[
"Troitskaya",
"N. I.",
""
]
] | The cross sections for the reactions of the strange production p + p -> p + Lambda + K^+ and p + p -> p + Sigma^0 + K^+ near thresholds of the final states p Lambda K^+ and p Sigma^0 K^+ are calculated in the effective Lagrangian approach. Our approach is based on the dominant contribution of the one-pion exchange and strong interaction of the colliding protons in the initial state. The theoretical values of the cross sections agree reasonably well with the experimental data. The polarization properties of the Lambda and Sigma^0 hyperons are discussed. |
2206.13196 | Yuji Shi | Yu-Ji Shi, Zhen-Xing Zhao, Ye Xing and Ulf-G. Mei{\ss}ner | W-exchange contribution to the decays
$\Xi_{cc}^{++}\to\Xi_{c}^{+(\prime)}\pi^{+}$ using light-cone sum rules | 18 pages, 4 figures, 4 tables | null | 10.1103/PhysRevD.106.034004 | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | We calculate the W-exchange contribution to the
$\Xi_{cc}^{++}\to\Xi_{c}^{+(\prime)}\pi^{+}$ decay using light-cone sum rules.
The two-particle light-cone distribution amplitudes of the pion are used as
non-perturbative input for the sum rules calculation, and the perturbative
kernel is calculated at the leading order. We obtain the corresponding decay
branching fractions by combining our W-exchange amplitudes with the
factorizable amplitudes given by various theoretical methods from the
literature. It is shown that with the factorizable amplitudes from heavy quark
effective theory, we obtain the branching fraction ratio ${\cal
B}(\Xi_{cc}^{++}\to\Xi_{c}^{+\prime}\pi^{+})/{\cal
B}(\Xi_{cc}^{++}\to\Xi_{c}^{+}\pi^{+})= 1.42\pm 0.78$, which is consistent with
the experimental value of $1.41\pm 0.17\pm 0.1$.
| [
{
"created": "Mon, 27 Jun 2022 11:23:47 GMT",
"version": "v1"
}
] | 2022-08-17 | [
[
"Shi",
"Yu-Ji",
""
],
[
"Zhao",
"Zhen-Xing",
""
],
[
"Xing",
"Ye",
""
],
[
"Meißner",
"Ulf-G.",
""
]
] | We calculate the W-exchange contribution to the $\Xi_{cc}^{++}\to\Xi_{c}^{+(\prime)}\pi^{+}$ decay using light-cone sum rules. The two-particle light-cone distribution amplitudes of the pion are used as non-perturbative input for the sum rules calculation, and the perturbative kernel is calculated at the leading order. We obtain the corresponding decay branching fractions by combining our W-exchange amplitudes with the factorizable amplitudes given by various theoretical methods from the literature. It is shown that with the factorizable amplitudes from heavy quark effective theory, we obtain the branching fraction ratio ${\cal B}(\Xi_{cc}^{++}\to\Xi_{c}^{+\prime}\pi^{+})/{\cal B}(\Xi_{cc}^{++}\to\Xi_{c}^{+}\pi^{+})= 1.42\pm 0.78$, which is consistent with the experimental value of $1.41\pm 0.17\pm 0.1$. |
1605.01532 | Paul Hoyer | Paul Hoyer | Lectures on Bound states | Based on lectures presented during 2014-15 at NIKHEF, Amsterdam; IPhT
Saclay; CP$^3$, Odense; GSI, Darmstadt; Bloomington, IN and Subatech, Nantes.
59 pages, 21 figures | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Even a first approximation of bound states requires contributions of all
powers in the coupling. This means that the concept of "lowest order bound
state" needs to be defined. In these lectures I discuss the "Born" (no loop,
lowest order in $\hbar$) approximation. Born level states are bound by gauge
fields which satisfy the classical field equations.
As a check of the method, Positronium states of any momentum are determined
as eigenstates of the QED Hamiltonian, quantized at equal time. Analogously,
states bound by a strong external field $A^\mu(\boldsymbol{x})$ are found as
eigenstates of the Dirac Hamiltonian. Their Fock states have dynamically
created $e^+e^-$ pairs, whose distribution is determined by the Dirac wave
function. The linear potential of $D=1+1$ dimensions confines electrons but
repels positrons. As a result, the mass spectrum is continuous and the wave
functions have features of both bound states and plane waves.
The classical solutions of Gauss' law are explored for hadrons in QCD. A
non-vanishing boundary condition at spatial infinity generates a constant
\order{\alpha_s^0} color electric field between quarks of specific colors.
Poincar\'e invariance limits the spectrum to color singlet $q\bar q$ and $qqq$
states, which do not generate an external color field. This restricts the
\order{\alpha_s^0} interactions between hadrons to string breaking dynamics as
in dual diagrams. Light mesons lie on linear Regge and parallel daughter
trajectories. There are massless states which may be significant for chiral
symmetry breaking. Since the bound states are defined at equal time in all
frames they have a non-trivial Lorentz covariance.
| [
{
"created": "Thu, 5 May 2016 09:01:19 GMT",
"version": "v1"
}
] | 2016-06-21 | [
[
"Hoyer",
"Paul",
""
]
] | Even a first approximation of bound states requires contributions of all powers in the coupling. This means that the concept of "lowest order bound state" needs to be defined. In these lectures I discuss the "Born" (no loop, lowest order in $\hbar$) approximation. Born level states are bound by gauge fields which satisfy the classical field equations. As a check of the method, Positronium states of any momentum are determined as eigenstates of the QED Hamiltonian, quantized at equal time. Analogously, states bound by a strong external field $A^\mu(\boldsymbol{x})$ are found as eigenstates of the Dirac Hamiltonian. Their Fock states have dynamically created $e^+e^-$ pairs, whose distribution is determined by the Dirac wave function. The linear potential of $D=1+1$ dimensions confines electrons but repels positrons. As a result, the mass spectrum is continuous and the wave functions have features of both bound states and plane waves. The classical solutions of Gauss' law are explored for hadrons in QCD. A non-vanishing boundary condition at spatial infinity generates a constant \order{\alpha_s^0} color electric field between quarks of specific colors. Poincar\'e invariance limits the spectrum to color singlet $q\bar q$ and $qqq$ states, which do not generate an external color field. This restricts the \order{\alpha_s^0} interactions between hadrons to string breaking dynamics as in dual diagrams. Light mesons lie on linear Regge and parallel daughter trajectories. There are massless states which may be significant for chiral symmetry breaking. Since the bound states are defined at equal time in all frames they have a non-trivial Lorentz covariance. |
1206.3304 | Nikita Blinov | Nikita Blinov, David E. Morrissey, Kris Sigurdson, Sean Tulin | Dark Matter Antibaryons from a Supersymmetric Hidden Sector | 33 pages, 10 figures. Minor changes to match published version | Phys.Rev. D86 (2012) 095021 | 10.1103/PhysRevD.86.095021 | MCTP-12-13 | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The cosmological origin of both dark and baryonic matter can be explained
through a unified mechanism called hylogenesis where baryon and antibaryon
number are divided between the visible sector and a GeV-scale hidden sector,
while the Universe remains net baryon symmetric. The "missing" antibaryons, in
the form of exotic hidden states, are the dark matter. We study model-building,
cosmological, and phenomenological aspects of this scenario within the
framework of supersymmetry, which naturally stabilizes the light hidden sector
and electroweak mass scales. Inelastic dark matter scattering on visible matter
destroys nucleons, and nucleon decay searches offer a novel avenue for the
direct detection of the hidden antibaryonic dark matter sea.
| [
{
"created": "Thu, 14 Jun 2012 20:00:01 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Dec 2012 06:26:40 GMT",
"version": "v2"
}
] | 2012-12-04 | [
[
"Blinov",
"Nikita",
""
],
[
"Morrissey",
"David E.",
""
],
[
"Sigurdson",
"Kris",
""
],
[
"Tulin",
"Sean",
""
]
] | The cosmological origin of both dark and baryonic matter can be explained through a unified mechanism called hylogenesis where baryon and antibaryon number are divided between the visible sector and a GeV-scale hidden sector, while the Universe remains net baryon symmetric. The "missing" antibaryons, in the form of exotic hidden states, are the dark matter. We study model-building, cosmological, and phenomenological aspects of this scenario within the framework of supersymmetry, which naturally stabilizes the light hidden sector and electroweak mass scales. Inelastic dark matter scattering on visible matter destroys nucleons, and nucleon decay searches offer a novel avenue for the direct detection of the hidden antibaryonic dark matter sea. |
1105.4624 | Susanne Westhoff | Susanne Westhoff | Top-Quark Forward-Backward Symmetry | prepared for the proceedings of Moriond 2011 EW | null | null | MZ-TH-11-13 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Top-quark pair production at the Tevatron is discussed within the
Randall-Sundrum model of warped extra dimensions. Generically, the exchange of
massive Kaluza-Klein gluons has the potential to generate a large
forward-backward asymmetry. In models with an anarchic flavor structure,
however, their coupling to the light quarks inside the proton is strongly
suppressed. The consequent suppression of the asymmetry at tree level is lifted
at next-to-leading order. Still, it is not possible to increase the
forward-backward asymmetry with respect to the Standard-Model prediction in
this framework.
| [
{
"created": "Mon, 23 May 2011 20:15:25 GMT",
"version": "v1"
}
] | 2015-03-19 | [
[
"Westhoff",
"Susanne",
""
]
] | Top-quark pair production at the Tevatron is discussed within the Randall-Sundrum model of warped extra dimensions. Generically, the exchange of massive Kaluza-Klein gluons has the potential to generate a large forward-backward asymmetry. In models with an anarchic flavor structure, however, their coupling to the light quarks inside the proton is strongly suppressed. The consequent suppression of the asymmetry at tree level is lifted at next-to-leading order. Still, it is not possible to increase the forward-backward asymmetry with respect to the Standard-Model prediction in this framework. |
hep-ph/0405252 | Luc Marleau | L. Marleau and J.-F. Rivard | B=2 Oblate Skyrmions | RevTeX, 8 pages, 2 figures | null | null | null | hep-ph | null | The numerical solution for the B=2 static soliton of the SU(2) Skyrme model
shows a profile function dependence which is not exactly radial. We propose to
quantify this with the introduction of an axially symmetric oblate ansatz
parametrized by a scale factor d. We then obtain a relatively deformed bound
soliton configuration with M_{B=2}/M_{B=1}=1.958. This is the first step
towards to description of B>1 quantized states such as the deuteron with a
non-rigid oblate ansatz where deformations due to centrifugal effects are
expected to be more important.
| [
{
"created": "Tue, 25 May 2004 15:27:49 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Jan 2005 01:10:21 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Marleau",
"L.",
""
],
[
"Rivard",
"J. -F.",
""
]
] | The numerical solution for the B=2 static soliton of the SU(2) Skyrme model shows a profile function dependence which is not exactly radial. We propose to quantify this with the introduction of an axially symmetric oblate ansatz parametrized by a scale factor d. We then obtain a relatively deformed bound soliton configuration with M_{B=2}/M_{B=1}=1.958. This is the first step towards to description of B>1 quantized states such as the deuteron with a non-rigid oblate ansatz where deformations due to centrifugal effects are expected to be more important. |
1401.4193 | Hilario Perez | Hilario P\'erez, Piotr Kielanowski, S. Rebeca Ju\'arez W., Gerardo
Mora | Asymptotic properties of CP violation in the Standard Model | 8 pages, 9 figures | Phys. Rev. D 89, 073014 (2014) | 10.1103/PhysRevD.89.073014 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the analysis of the renormalization based evolution of the
CP-violation observables obtained from the $C$ matrix introduced by Jarlskog.
We show that the observables $\vert\det C\vert$ and $\operatorname{Tr}C^{2}$
decrease very fast with the energy and their value is reduced at the Planck's
scale by 5 and 3 orders of magnitude with respect to their low energy values.
On the other hand the Jarlskog's CKM matrix rephasing invariant $J$ increases
with energy and at the Planck's scale is 25 % larger than at low energy. The
absolute value of the coefficient $a_{CP}\sim \det
C/(\operatorname{Tr}C^{2})^{3/2}$ decreases with energy and at the Planck's
scale it is 12 % smaller than at low energy. We also find that the pattern of
the eigenvalues of the $C$ matrix is such that two eigenvalues almost cancel
each other and their absolute values are much bigger than the absolute value of
the third eigenvalue. The low rate of the CP-violation is a consequence of this
pattern of the eigenvalues.
| [
{
"created": "Thu, 16 Jan 2014 22:24:02 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Jan 2014 01:20:58 GMT",
"version": "v2"
},
{
"created": "Tue, 24 Feb 2015 02:35:34 GMT",
"version": "v3"
}
] | 2015-02-25 | [
[
"Pérez",
"Hilario",
""
],
[
"Kielanowski",
"Piotr",
""
],
[
"W.",
"S. Rebeca Juárez",
""
],
[
"Mora",
"Gerardo",
""
]
] | We present the analysis of the renormalization based evolution of the CP-violation observables obtained from the $C$ matrix introduced by Jarlskog. We show that the observables $\vert\det C\vert$ and $\operatorname{Tr}C^{2}$ decrease very fast with the energy and their value is reduced at the Planck's scale by 5 and 3 orders of magnitude with respect to their low energy values. On the other hand the Jarlskog's CKM matrix rephasing invariant $J$ increases with energy and at the Planck's scale is 25 % larger than at low energy. The absolute value of the coefficient $a_{CP}\sim \det C/(\operatorname{Tr}C^{2})^{3/2}$ decreases with energy and at the Planck's scale it is 12 % smaller than at low energy. We also find that the pattern of the eigenvalues of the $C$ matrix is such that two eigenvalues almost cancel each other and their absolute values are much bigger than the absolute value of the third eigenvalue. The low rate of the CP-violation is a consequence of this pattern of the eigenvalues. |
hep-ph/0204281 | Joseph Manjavidze | J. Manjavidze and A. Sissakian | Phenomenology of Very High Multiplicity Hadron Processes | 6 pages, 4 figures | null | null | null | hep-ph | null | We discuss the possibility to suppress the nonperturbative effects if the
very high multiplicity hadron final states are chosen. The theoretical
uncertainties and possible experimental measurements are described.
| [
{
"created": "Wed, 24 Apr 2002 13:00:53 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Oct 2002 18:34:57 GMT",
"version": "v2"
},
{
"created": "Thu, 10 Oct 2002 14:20:14 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Manjavidze",
"J.",
""
],
[
"Sissakian",
"A.",
""
]
] | We discuss the possibility to suppress the nonperturbative effects if the very high multiplicity hadron final states are chosen. The theoretical uncertainties and possible experimental measurements are described. |
hep-ph/0008168 | Mankiewicz | N. Kivel, L. Mankiewicz | Power corrections to the process $\gamma\gamma^*\to \pi\pi$ in the
Light-Cone Sum Rules approach | 20 pages, 6 figures | Eur.Phys.J.C18:107-116,2000 | 10.1007/s100520000524 | TPR-00-12 | hep-ph | null | We applied QCD Light Cone Sum Rules to estimate power corrections to the
helicity-conserving amplitude in the process $\gamma^*\gamma\to \pi\pi$. We
found that above $Q^2 \sim 4$ GeV$^2$ power corrections are numerically small
and the twist-2 part dominates.The amplitude can be reliably calculated in this
region using models of $2 \pi$ distribution amplitudes as an input. We found
that the magnitude of the NLO corrections depends rather strongly on the
normalization of the gluonic distribution amplitude.
| [
{
"created": "Wed, 16 Aug 2000 15:09:11 GMT",
"version": "v1"
}
] | 2011-09-13 | [
[
"Kivel",
"N.",
""
],
[
"Mankiewicz",
"L.",
""
]
] | We applied QCD Light Cone Sum Rules to estimate power corrections to the helicity-conserving amplitude in the process $\gamma^*\gamma\to \pi\pi$. We found that above $Q^2 \sim 4$ GeV$^2$ power corrections are numerically small and the twist-2 part dominates.The amplitude can be reliably calculated in this region using models of $2 \pi$ distribution amplitudes as an input. We found that the magnitude of the NLO corrections depends rather strongly on the normalization of the gluonic distribution amplitude. |
hep-ph/0407021 | Dilip Kumar Ghosh | N.G. Deshpande, Dilip Kumar Ghosh, Xiao-Gang He | Constraints on New Physics from $K \to \pi \nu \bar{\nu}$ | K_L --> pi^0 e+ e- section has been altered, new references to this
process are cited. One Figure has been removed and other Figure modified | Phys.Rev. D70 (2004) 093003 | 10.1103/PhysRevD.70.093003 | OITS-754 | hep-ph | null | We study constraints on new physics from the recent measurement of Br ($K^+
\to \pi^+ \nu \bar \nu)$ by the E787 and E949 Collaborations. In our analysis
we consider two models of new physics: $(a)$ extra down type singlet quark
model (EDSQ) and $(b)$ R-parity violating Minimal Supersymmetric Standard
Model(MSSM). We find that $K^+\to \pi^+ \nu\bar \nu$ along with other processes
like $K_L \to \mu^+ \mu^-, \epsilon^\prime/\epsilon $ provide useful bounds on
the parameter $U_{sd}$, characterizing the off-diagonal $Z-d-\bar s $ coupling
of model $(a)$. The bounds on the ${\rm Re}(U_{sd})$ from $(K_L \to
\mu^+\mu^-)_{\rm SD}$ and ${\rm Im}(U_{sd})$ from $\epsilon^\prime/\epsilon$
are so tight that the branching ratio of $K^+\to \pi^+ \nu \bar \nu $ can
exceed the standard model value by at most a factor of two For model b), we
also obtain stringent bounds on certain combinations of product of two
$\lp_{ijk}$ couplings originating from $L$ number violating operator $ L_i Q_j
D^c_k $ using $K^+ \to \pi^+ \nu \bar \nu $ and $K_L \to \mu^+ \mu^-$
processes. Even with the stringent constraints on $U_{sd}$ (in model $(a)$) and
on products of two $\rp$couplings (model $(b)$), we find that the branching
ratios for $K_L \to \pi^0 \nu \bar \nu$ and $K_L \to \pi^0 e^+ e^-$ can be
substantially different in both the above models from those predicted in the
standard model.
| [
{
"created": "Fri, 2 Jul 2004 01:01:04 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Jul 2004 23:03:40 GMT",
"version": "v2"
},
{
"created": "Mon, 30 Aug 2004 21:17:37 GMT",
"version": "v3"
}
] | 2009-11-10 | [
[
"Deshpande",
"N. G.",
""
],
[
"Ghosh",
"Dilip Kumar",
""
],
[
"He",
"Xiao-Gang",
""
]
] | We study constraints on new physics from the recent measurement of Br ($K^+ \to \pi^+ \nu \bar \nu)$ by the E787 and E949 Collaborations. In our analysis we consider two models of new physics: $(a)$ extra down type singlet quark model (EDSQ) and $(b)$ R-parity violating Minimal Supersymmetric Standard Model(MSSM). We find that $K^+\to \pi^+ \nu\bar \nu$ along with other processes like $K_L \to \mu^+ \mu^-, \epsilon^\prime/\epsilon $ provide useful bounds on the parameter $U_{sd}$, characterizing the off-diagonal $Z-d-\bar s $ coupling of model $(a)$. The bounds on the ${\rm Re}(U_{sd})$ from $(K_L \to \mu^+\mu^-)_{\rm SD}$ and ${\rm Im}(U_{sd})$ from $\epsilon^\prime/\epsilon$ are so tight that the branching ratio of $K^+\to \pi^+ \nu \bar \nu $ can exceed the standard model value by at most a factor of two For model b), we also obtain stringent bounds on certain combinations of product of two $\lp_{ijk}$ couplings originating from $L$ number violating operator $ L_i Q_j D^c_k $ using $K^+ \to \pi^+ \nu \bar \nu $ and $K_L \to \mu^+ \mu^-$ processes. Even with the stringent constraints on $U_{sd}$ (in model $(a)$) and on products of two $\rp$couplings (model $(b)$), we find that the branching ratios for $K_L \to \pi^0 \nu \bar \nu$ and $K_L \to \pi^0 e^+ e^-$ can be substantially different in both the above models from those predicted in the standard model. |
2001.05415 | Anselm Vossen | Mauro Anselmino, Asmita Mukherjee, Anselm Vossen | Transverse spin effects in hard semi-inclusive collisions | 75 pages, 23 figures, accepted for publication in "Progress in
Particle and Nuclear Physics" | Prog.Part.Nucl.Phys. 114 (2020) 103806 | 10.1016/j.ppnp.2020.103806 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The nucleons (protons and neutrons) are by far the most abundant form of
matter in our visible Universe; they are composite particles made of quarks and
gluons, the fundamental quanta of Quantum Chromo Dynamics (QCD). The usual
interpretation of the nucleon dynamics in high energy interactions is often
limited to a simple one-dimensional picture of a fast moving nucleon as a
collection of co-linearly moving quarks and gluons (partons), interacting
accordingly to perturbative QCD rules. However, massive experimental evidence
shows that, in particular when transverse spin dependent observables are
involved, such a simple picture is not adequate. The intrinsic transverse
motion of partons has to be taken into account; this opens the way to a new,
truly 3-dimensional (3D) study of the nucleon structure. A review of the main
experimental data, their interpretation and understanding in terms of new
transverse momentum dependent partonic distributions, and the progress in
building a 3D imaging of the nucleon is presented.
| [
{
"created": "Wed, 15 Jan 2020 16:34:26 GMT",
"version": "v1"
},
{
"created": "Wed, 20 May 2020 13:29:27 GMT",
"version": "v2"
}
] | 2020-08-17 | [
[
"Anselmino",
"Mauro",
""
],
[
"Mukherjee",
"Asmita",
""
],
[
"Vossen",
"Anselm",
""
]
] | The nucleons (protons and neutrons) are by far the most abundant form of matter in our visible Universe; they are composite particles made of quarks and gluons, the fundamental quanta of Quantum Chromo Dynamics (QCD). The usual interpretation of the nucleon dynamics in high energy interactions is often limited to a simple one-dimensional picture of a fast moving nucleon as a collection of co-linearly moving quarks and gluons (partons), interacting accordingly to perturbative QCD rules. However, massive experimental evidence shows that, in particular when transverse spin dependent observables are involved, such a simple picture is not adequate. The intrinsic transverse motion of partons has to be taken into account; this opens the way to a new, truly 3-dimensional (3D) study of the nucleon structure. A review of the main experimental data, their interpretation and understanding in terms of new transverse momentum dependent partonic distributions, and the progress in building a 3D imaging of the nucleon is presented. |
hep-ph/9609298 | null | Estia Eichten and Kenneth Lane | Electroweak and Flavor Dynamics at Hadron Colliders--II | 12 pages; TeX using harvmac macros | null | null | FERMILAB-CONF-96/298-T, BUHEP-96-34 | hep-ph hep-ex | null | This is the second of two reports cataloging the principal signatures of
electroweak and flavor dynamics at $\pbarp$ and $pp$ colliders. Here, we
complete our overview of technicolor with a discussion of signatures specific
to topcolor-assisted technicolor. We also review signatures of flavor dynamics
associated with quark and lepton substructure. These occur in excess production
rates for dijets and dileptons with high $E_T$ and high invariant mass. An
important feature of these processes is that they exhibit fairly central
angular and rapidity distributions. This report will appear in the Proceedings
of the 1996 DPF/DPB Summer Study on New Directions for High Energy Physics
(Snowmass 96).
| [
{
"created": "Mon, 9 Sep 1996 18:43:07 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Eichten",
"Estia",
""
],
[
"Lane",
"Kenneth",
""
]
] | This is the second of two reports cataloging the principal signatures of electroweak and flavor dynamics at $\pbarp$ and $pp$ colliders. Here, we complete our overview of technicolor with a discussion of signatures specific to topcolor-assisted technicolor. We also review signatures of flavor dynamics associated with quark and lepton substructure. These occur in excess production rates for dijets and dileptons with high $E_T$ and high invariant mass. An important feature of these processes is that they exhibit fairly central angular and rapidity distributions. This report will appear in the Proceedings of the 1996 DPF/DPB Summer Study on New Directions for High Energy Physics (Snowmass 96). |
1004.3852 | Koichi Yoshioka | Shigeki Matsumoto, Takehiro Nabeshima, Koichi Yoshioka | Seesaw Neutrino Signals at the Large Hadron Collider | 27 pages, 4 figures | JHEP 1006:058,2010 | 10.1007/JHEP06(2010)058 | UT-HET 036, KUNS-2263 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the scenario with gauge singlet fermions (right-handed neutrinos)
accessible at the energy of the Large Hadron Collider. The singlet fermions
generate tiny neutrino masses via the seesaw mechanism and also have sizable
couplings to the standard-model particles. We demonstrate that these two facts,
which are naively not satisfied simultaneously, are reconciled in the
five-dimensional framework in various fashions, which make the seesaw mechanism
observable. The collider signal of tri-lepton final states with transverse
missing energy is investigated for two explicit examples of the observable
seesaw, taking account of three types of neutrino mass spectrum and the
constraint from lepton flavor violation. We find by showing the significance of
signal discovery that the collider experiment has a potential to find signals
of extra dimensions and the origin of small neutrino masses.
| [
{
"created": "Thu, 22 Apr 2010 07:23:17 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Jun 2010 10:06:55 GMT",
"version": "v2"
}
] | 2014-11-20 | [
[
"Matsumoto",
"Shigeki",
""
],
[
"Nabeshima",
"Takehiro",
""
],
[
"Yoshioka",
"Koichi",
""
]
] | We discuss the scenario with gauge singlet fermions (right-handed neutrinos) accessible at the energy of the Large Hadron Collider. The singlet fermions generate tiny neutrino masses via the seesaw mechanism and also have sizable couplings to the standard-model particles. We demonstrate that these two facts, which are naively not satisfied simultaneously, are reconciled in the five-dimensional framework in various fashions, which make the seesaw mechanism observable. The collider signal of tri-lepton final states with transverse missing energy is investigated for two explicit examples of the observable seesaw, taking account of three types of neutrino mass spectrum and the constraint from lepton flavor violation. We find by showing the significance of signal discovery that the collider experiment has a potential to find signals of extra dimensions and the origin of small neutrino masses. |
1605.08619 | Mikl\'os Horv\'ath | Mikl\'os Horv\'ath | Statistical and Thermodynamical Studies of the Strongly Interacting
Matter | Ph.D. thesis, supervised by Tamas Sandor Biro and Antal Jakovac; v2:
several typos corrected, minor corrections according to the reviewers'
advices, additional selected Q&As available as an ancillary file | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this thesis we discuss three separate analysis of various phenomenological
aspects of heavy-ion collisions (HIC). The first one is a possible
generalization of the kinetic theory framework for dense systems. We
investigate its long-time behaviour and the properties of the equilibrium. The
second discussion is about the phenomenological analysis of the azimuthal
asymmetry of the particle yields in a HIC, where we link the initial stage
geometrical asymmetry to the particle yields and examine the possible
organizing mechanisms that could be responsible for such a relation. The third,
and also the most thorough part of the thesis is about the relation of the
spectral density of quasi-particle states and the macroscopic fluidity measure
(the ratio of shear viscosity and the entropy density) and other transport
properties of the system. We extensively study the liquid-gas crossover with
the help of model spectral functions. The main conclusion is that the relative
intensification of the continuum of the scattering states compared to the
quasi-particle peak makes the matter more fluent.
| [
{
"created": "Fri, 27 May 2016 13:01:59 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Jul 2016 13:45:42 GMT",
"version": "v2"
}
] | 2016-07-27 | [
[
"Horváth",
"Miklós",
""
]
] | In this thesis we discuss three separate analysis of various phenomenological aspects of heavy-ion collisions (HIC). The first one is a possible generalization of the kinetic theory framework for dense systems. We investigate its long-time behaviour and the properties of the equilibrium. The second discussion is about the phenomenological analysis of the azimuthal asymmetry of the particle yields in a HIC, where we link the initial stage geometrical asymmetry to the particle yields and examine the possible organizing mechanisms that could be responsible for such a relation. The third, and also the most thorough part of the thesis is about the relation of the spectral density of quasi-particle states and the macroscopic fluidity measure (the ratio of shear viscosity and the entropy density) and other transport properties of the system. We extensively study the liquid-gas crossover with the help of model spectral functions. The main conclusion is that the relative intensification of the continuum of the scattering states compared to the quasi-particle peak makes the matter more fluent. |
1208.5578 | Pietro Falgari | M. Beneke, P. Falgari, S. Klein, J. Piclum, C. Schwinn, M. Ubiali, F.
Yan | The total top-pair production cross section at NNLL | LaTeX, 4 pages, 2 figures. To appear in the proceedings of the 16th
International Conference in Quantum ChromoDynamics (QCD12), 2-6 July 2012,
Montpellier. v2: reference added | null | 10.1016/j.nuclphysbps.2012.11.024 | TUM-HEP 853/12, TTK-12-36, ITP-UU-12/30, SPIN-12/28,
FR-PHENO-2012-022, SFB/CPP-12-65 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present results for the total top-pair production cross section at the
Tevatron and the LHC. Our predictions supplement fixed-order results with
resummation of soft logarithms and Coulomb singularities to
next-to-next-to-leading (NNLL) logarithmic accuracy and include top-antitop
bound-state effects. The effects of resummation, the dependence on the PDF set
used, the residual sources of theoretical uncertainty and their implication for
measurements of the top-quark mass are discussed.
| [
{
"created": "Tue, 28 Aug 2012 07:49:46 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Aug 2012 16:17:31 GMT",
"version": "v2"
}
] | 2015-06-11 | [
[
"Beneke",
"M.",
""
],
[
"Falgari",
"P.",
""
],
[
"Klein",
"S.",
""
],
[
"Piclum",
"J.",
""
],
[
"Schwinn",
"C.",
""
],
[
"Ubiali",
"M.",
""
],
[
"Yan",
"F.",
""
]
] | We present results for the total top-pair production cross section at the Tevatron and the LHC. Our predictions supplement fixed-order results with resummation of soft logarithms and Coulomb singularities to next-to-next-to-leading (NNLL) logarithmic accuracy and include top-antitop bound-state effects. The effects of resummation, the dependence on the PDF set used, the residual sources of theoretical uncertainty and their implication for measurements of the top-quark mass are discussed. |
hep-ph/0304178 | Jonathan L. Rosner | Michael Gronau and Jonathan L. Rosner | I-spin, U-spin, and penguin dominance in $B \to K K \bar K$ | 9 pages, LaTeX, no figures, to be submitted to Physics Letters B.
Revision of earlier version, new title | Phys.Lett. B564 (2003) 90-96 | 10.1016/S0370-2693(03)00702-0 | EFI 03-14 | hep-ph | null | Isospin and U-spin symmetries are useful approximations for studying penguin
dominance in $B$ meson decays to three kaons, $B\to KK\bar K$. We point out
certain subtleties in treating these decays in these approximations. Resulting
uncertainties are discussed in determining the CP content of the final state in
$B \to K^+K^-K_S$, and in relating the CP asymmetry in this process to the
value of $\sin 2\beta$.
| [
{
"created": "Thu, 17 Apr 2003 21:31:28 GMT",
"version": "v1"
},
{
"created": "Sun, 20 Apr 2003 18:27:10 GMT",
"version": "v2"
},
{
"created": "Tue, 29 Apr 2003 18:40:24 GMT",
"version": "v3"
}
] | 2010-04-05 | [
[
"Gronau",
"Michael",
""
],
[
"Rosner",
"Jonathan L.",
""
]
] | Isospin and U-spin symmetries are useful approximations for studying penguin dominance in $B$ meson decays to three kaons, $B\to KK\bar K$. We point out certain subtleties in treating these decays in these approximations. Resulting uncertainties are discussed in determining the CP content of the final state in $B \to K^+K^-K_S$, and in relating the CP asymmetry in this process to the value of $\sin 2\beta$. |
1709.05354 | Ken Van Tilburg | Asimina Arvanitaki, Savas Dimopoulos, Ken Van Tilburg | Resonant absorption of bosonic dark matter in molecules | 41 pages, 13 figures | Phys. Rev. X 8, 041001 (2018) | 10.1103/PhysRevX.8.041001 | null | hep-ph hep-th physics.atom-ph physics.optics | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a new class of bosonic dark matter (DM) detectors based on
resonant absorption onto a gas of small polyatomic molecules. Bosonic DM acts
on the molecules as a narrow-band perturbation, like an intense but weakly
coupled laser. The excited molecules emit the absorbed energy into fluorescence
photons that are picked up by sensitive photodetectors with low dark count
rates. This setup is sensitive to any DM candidate that couples to electrons,
photons, and nuclei, and may improve on current searches by several orders of
magnitude in coupling for DM masses between 0.2 eV and 20 eV. This type of
detector has excellent intrinsic energy resolution, along with several control
variables---pressure, temperature, external electromagnetic fields, molecular
species/isotopes---that allow for powerful background rejection methods as well
as precision studies of a potential DM signal. The proposed experiment does not
require usage of novel exotic materials or futuristic technologies, relying
instead on the well-established field of molecular spectroscopy, and on recent
advances in single-photon detection. Cooperative radiation effects, which arise
due to the large spatial coherence of the nonrelativistic DM field in certain
detector geometries, can tightly focus the DM-induced fluorescence photons in a
direction that depends on the DM's velocity, possibly permitting a detailed
reconstruction of the full 3D velocity distribution in our Galactic
neighborhood, as well as further background rejection.
| [
{
"created": "Fri, 15 Sep 2017 18:00:36 GMT",
"version": "v1"
}
] | 2018-10-10 | [
[
"Arvanitaki",
"Asimina",
""
],
[
"Dimopoulos",
"Savas",
""
],
[
"Van Tilburg",
"Ken",
""
]
] | We propose a new class of bosonic dark matter (DM) detectors based on resonant absorption onto a gas of small polyatomic molecules. Bosonic DM acts on the molecules as a narrow-band perturbation, like an intense but weakly coupled laser. The excited molecules emit the absorbed energy into fluorescence photons that are picked up by sensitive photodetectors with low dark count rates. This setup is sensitive to any DM candidate that couples to electrons, photons, and nuclei, and may improve on current searches by several orders of magnitude in coupling for DM masses between 0.2 eV and 20 eV. This type of detector has excellent intrinsic energy resolution, along with several control variables---pressure, temperature, external electromagnetic fields, molecular species/isotopes---that allow for powerful background rejection methods as well as precision studies of a potential DM signal. The proposed experiment does not require usage of novel exotic materials or futuristic technologies, relying instead on the well-established field of molecular spectroscopy, and on recent advances in single-photon detection. Cooperative radiation effects, which arise due to the large spatial coherence of the nonrelativistic DM field in certain detector geometries, can tightly focus the DM-induced fluorescence photons in a direction that depends on the DM's velocity, possibly permitting a detailed reconstruction of the full 3D velocity distribution in our Galactic neighborhood, as well as further background rejection. |
hep-ph/9807403 | Lucchesi | J.-P. Derendinger, C. Lucchesi | Realizations of Thermal Supersymmetry | 27 pages, no figures, LaTeX. Typos corrected and references added. To
appear in Nucl. Phys. B | Nucl.Phys. B536 (1998) 483-510 | 10.1016/S0550-3213(98)00634-8 | NEIP-98-006 | hep-ph hep-th | null | We investigate realizations of supersymmetry at finite temperature in terms
of thermal superfields, in a thermally constrained superspace: the Grassmann
coordinates are promoted to be time-dependent and antiperiodic, with a period
given by the inverse temperature. This approach allows to formulate a
Kubo-Martin-Schwinger (KMS) condition at the level of thermal superfield
propagators. The latter is proven directly in thermal superspace, and is shown
to imply the correct (bosonic and fermionic) KMS conditions for the component
fields. In thermal superspace, we formulate thermal covariant derivatives and
supercharges and derive the thermal super-Poincar\'e algebra. Finally, we
briefly investigate field realizations of this thermal supersymmetry algebra,
focussing on the Wess-Zumino model. The thermal superspace formalism is used to
characterize the breaking of global supersymmetry at finite temperature.
| [
{
"created": "Fri, 17 Jul 1998 12:49:45 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Sep 1998 10:20:55 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Derendinger",
"J. -P.",
""
],
[
"Lucchesi",
"C.",
""
]
] | We investigate realizations of supersymmetry at finite temperature in terms of thermal superfields, in a thermally constrained superspace: the Grassmann coordinates are promoted to be time-dependent and antiperiodic, with a period given by the inverse temperature. This approach allows to formulate a Kubo-Martin-Schwinger (KMS) condition at the level of thermal superfield propagators. The latter is proven directly in thermal superspace, and is shown to imply the correct (bosonic and fermionic) KMS conditions for the component fields. In thermal superspace, we formulate thermal covariant derivatives and supercharges and derive the thermal super-Poincar\'e algebra. Finally, we briefly investigate field realizations of this thermal supersymmetry algebra, focussing on the Wess-Zumino model. The thermal superspace formalism is used to characterize the breaking of global supersymmetry at finite temperature. |
2407.15419 | Danny Marfatia | Danny Marfatia, Po-Yan Tseng, Yu-Min Yeh | Phenomenology of bubble size distributions in a first-order phase
transition | 15 pages, 7 figures, 1 table | null | null | null | hep-ph astro-ph.CO hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Fermi balls (FBs) and primordial black holes (PBHs) can be copiously produced
during a dark first-order phase transition (FOPT). The radius distribution of
false vacuum bubbles causes FBs and PBHs to have extended mass distributions.
We show how gravitational wave (GW), microlensing and Hawking evaporation
signals deviate from the case of monochromatic distributions. The peak of the
GW spectrum is shifted to lower frequencies and the spectrum is broadened at
frequencies below the peak frequency. Thus, the radius distribution of true
vacuum bubbles introduces another uncertainty in the evaluation of the GW
spectrum from a FOPT. The extragalactic gamma-ray signal at AMEGO-X/e-ASTROGAM
from PBH evaporation may evince a break in the power-law spectrum between 5~MeV
and 10~MeV for an extended PBH mass distribution. Optical microlensing surveys
may observe PBHs lighter than $10^{-10}M_\odot$, which is not possible for
monochromatic mass distributions. This expands the FOPT parameter space that
can be explored with microlensing.
| [
{
"created": "Mon, 22 Jul 2024 06:46:38 GMT",
"version": "v1"
}
] | 2024-07-25 | [
[
"Marfatia",
"Danny",
""
],
[
"Tseng",
"Po-Yan",
""
],
[
"Yeh",
"Yu-Min",
""
]
] | Fermi balls (FBs) and primordial black holes (PBHs) can be copiously produced during a dark first-order phase transition (FOPT). The radius distribution of false vacuum bubbles causes FBs and PBHs to have extended mass distributions. We show how gravitational wave (GW), microlensing and Hawking evaporation signals deviate from the case of monochromatic distributions. The peak of the GW spectrum is shifted to lower frequencies and the spectrum is broadened at frequencies below the peak frequency. Thus, the radius distribution of true vacuum bubbles introduces another uncertainty in the evaluation of the GW spectrum from a FOPT. The extragalactic gamma-ray signal at AMEGO-X/e-ASTROGAM from PBH evaporation may evince a break in the power-law spectrum between 5~MeV and 10~MeV for an extended PBH mass distribution. Optical microlensing surveys may observe PBHs lighter than $10^{-10}M_\odot$, which is not possible for monochromatic mass distributions. This expands the FOPT parameter space that can be explored with microlensing. |
hep-ph/9508394 | Jose F. Nieves | J. C. D'Olivo and Jose F. Nieves | Remarks on the Coulomb and Covariant Gauges in Finite Temperature QED | LaTeX, 10 pages, no figures; to be published in Phys. Lett. B | Phys.Lett. B359 (1995) 148-154 | 10.1016/0370-2693(95)01076-3 | null | hep-ph | null | We compare the use of the Coulomb gauge in finite temperature QED with a
recently proposed prescription for covariant gauges, in which only the
transverse photon degrees of freedom are thermalized. Using the Landau rule as
a guide, we clarify the relation between the retarded electron self-energy and
the elements of the self-energy matrix in the real-time formulation of . The
general results are illustrated by means of the one-loop expressions for the
electron self-energy in a QED plasma.
| [
{
"created": "Tue, 29 Aug 1995 15:47:00 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"D'Olivo",
"J. C.",
""
],
[
"Nieves",
"Jose F.",
""
]
] | We compare the use of the Coulomb gauge in finite temperature QED with a recently proposed prescription for covariant gauges, in which only the transverse photon degrees of freedom are thermalized. Using the Landau rule as a guide, we clarify the relation between the retarded electron self-energy and the elements of the self-energy matrix in the real-time formulation of . The general results are illustrated by means of the one-loop expressions for the electron self-energy in a QED plasma. |
hep-ph/0608128 | Satoru Kaneko | Masako Bando, Satoru Kaneko, Midori Obara, Morimitsu Tanimoto | Can symmetric texture reproduce unitarity triangle and $m_b/m_\tau$ ? | 11 pages, 5 figures | Prog.Theor.Phys.116:1105-1115,2007 | 10.1143/PTP.116.1105 | OCHA-PP-266 | hep-ph | null | We study the SUSY SO(10) GUT with the symmetric two-zero textures of
quark/lepton mass matrix which realize the Georgei-Jarlskog relations in
down-type quark and charged lepton masses. We show that the important
constraints to such framework come from the bottom-tau unification and the
observed value of $\sin2\beta$, one of the angles in the CKM unitarity
triangle. We investigate the symmetric two-zero textures assumed at the GUT
scale by solving the MSSM renormalization group equations with right-handed
neutrino threshold effects. As a result, the value of $\tan\tilde{\beta}$ is
constrained to be large enough and the representation of Higgs field which
couples to the third generation of left- and right-handed neutrinos is
restricted by the bottom-tau unification condition. The textures with vanishing
1-2 (and 2-1) element for up-type quarks and vanishing 1-3 (and 3-1) element
for down-type quarks are favored by the observation of $\sin2\beta$.
| [
{
"created": "Fri, 11 Aug 2006 10:14:54 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Bando",
"Masako",
""
],
[
"Kaneko",
"Satoru",
""
],
[
"Obara",
"Midori",
""
],
[
"Tanimoto",
"Morimitsu",
""
]
] | We study the SUSY SO(10) GUT with the symmetric two-zero textures of quark/lepton mass matrix which realize the Georgei-Jarlskog relations in down-type quark and charged lepton masses. We show that the important constraints to such framework come from the bottom-tau unification and the observed value of $\sin2\beta$, one of the angles in the CKM unitarity triangle. We investigate the symmetric two-zero textures assumed at the GUT scale by solving the MSSM renormalization group equations with right-handed neutrino threshold effects. As a result, the value of $\tan\tilde{\beta}$ is constrained to be large enough and the representation of Higgs field which couples to the third generation of left- and right-handed neutrinos is restricted by the bottom-tau unification condition. The textures with vanishing 1-2 (and 2-1) element for up-type quarks and vanishing 1-3 (and 3-1) element for down-type quarks are favored by the observation of $\sin2\beta$. |
hep-ph/9710205 | Daniel de Florian | D. de Florian (CERN-TH division) and R. Sassot (UBA-Argentina) | Target Fragmentation and Fracture Functions | To be published in Proceedings of the Madrid low-x Workshop,
Miraflores de la Sierra, June 18-21, 1997 | null | null | null | hep-ph | null | We analyse recent data on the production of forward neutrons in deep
inelastic scattering at HERA in the framework of a perturbative QCD description
for semi-inclusive processes, which includes fracture functions.
| [
{
"created": "Wed, 1 Oct 1997 11:20:22 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"de Florian",
"D.",
"",
"CERN-TH division"
],
[
"Sassot",
"R.",
"",
"UBA-Argentina"
]
] | We analyse recent data on the production of forward neutrons in deep inelastic scattering at HERA in the framework of a perturbative QCD description for semi-inclusive processes, which includes fracture functions. |
hep-ph/0409045 | Iain W. Stewart | Keith S. M. Lee, Iain W. Stewart | Factorization for Power Corrections to B->Xs gamma and B-> Xu e nu | 76 pages, 21 figs | Nucl.Phys.B721:325-406,2005 | 10.1016/j.nuclphysb.2005.05.004 | MIT-CTP-3521 | hep-ph hep-ex | null | We derive factorization theorems for Lambda_QCD/mb power corrections to
inclusive B-decays in the endpoint region, where mX^2 ~mb Lambda_QCD. In B-> Xu
e nu our results are for the full triply differential rate. A complete
enumeration of Lambda_QCD/mb corrections is given. We point out the presence of
new Lambda_QCD/mb-suppressed shape functions, which arise at tree level with a
$4 pi$-enhanced coefficient, and show that these previously neglected terms
induce an additional large uncertainty for current inclusive methods of
measuring |Vub| that depend on the endpoint region of phase space.
| [
{
"created": "Mon, 6 Sep 2004 17:10:44 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Mar 2005 06:54:48 GMT",
"version": "v2"
}
] | 2011-01-27 | [
[
"Lee",
"Keith S. M.",
""
],
[
"Stewart",
"Iain W.",
""
]
] | We derive factorization theorems for Lambda_QCD/mb power corrections to inclusive B-decays in the endpoint region, where mX^2 ~mb Lambda_QCD. In B-> Xu e nu our results are for the full triply differential rate. A complete enumeration of Lambda_QCD/mb corrections is given. We point out the presence of new Lambda_QCD/mb-suppressed shape functions, which arise at tree level with a $4 pi$-enhanced coefficient, and show that these previously neglected terms induce an additional large uncertainty for current inclusive methods of measuring |Vub| that depend on the endpoint region of phase space. |
2101.02165 | Shankha Banerjee | Shankha Banerjee, Fawzi Boudjema, Nabarun Chakrabarty and Hao Sun | Relic density of dark matter in the inert doublet model beyond leading
order for the low mass region: 1. Renormalisation and constraints | v1: 33 pages, 5 figures and 4 tables | Phys. Rev. D 104, 075002 (2021) | 10.1103/PhysRevD.104.075002 | LAPTH-001/21, CERN-TH-2021-001 | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | The present paper is the first in a series that addresses the calculation of
the full one-loop corrections of dark matter (DM) annihilation cross-sections
in the low mass region of the inert doublet model (IDM). We first review the
renormalisation of the model both in a fully on-shell (OS) scheme and a mixed
scheme combining on-shell (for the masses) and a $\overline{{\rm MS}}$ approach
when the partial invisible width is closed and does not allow the use of a full
OS scheme. The scale dependence introduced by the mixed scheme is shown to be
tracked through an analysis of a parametrisation of the tree-level
cross-section and the $\beta$ constant of a specific coupling. We discuss how
to minimise the scale dependence. The theoretical uncertainty brought by the
scale dependence leads us to introduce a new criterion on the perturbativity of
the IDM. This criterion further delimits the allowed parameter space which we
investigate carefully by including a host of constraints, both theoretical and
experimental, including in particular, new data from the LHC. We come up with a
set of benchmark points that cover three different mechanisms for a viable
relic density of DM: {\it i)} a dominance of co-annihilation into a fermion
pair, { \it ii)} annihilation into 2 vector bosons of which one is off-shell
that requires the calculation of a $2 \to 3$ process at one-loop, {\it iii)}
annihilation that proceeds through the very narrow standard model Higgs
resonance. Since the $2 \to 3$ vector boson channel features in all three
channels and is essentially a build up on the simpler annihilation to OS vector
bosons, we study the latter in detail in the present paper. We confirm again
that the corrected cross-sections involve a parameter that represents
rescattering in the dark sector that a tree-level computation in not sensitive
to.
| [
{
"created": "Wed, 6 Jan 2021 18:03:32 GMT",
"version": "v1"
}
] | 2021-10-13 | [
[
"Banerjee",
"Shankha",
""
],
[
"Boudjema",
"Fawzi",
""
],
[
"Chakrabarty",
"Nabarun",
""
],
[
"Sun",
"Hao",
""
]
] | The present paper is the first in a series that addresses the calculation of the full one-loop corrections of dark matter (DM) annihilation cross-sections in the low mass region of the inert doublet model (IDM). We first review the renormalisation of the model both in a fully on-shell (OS) scheme and a mixed scheme combining on-shell (for the masses) and a $\overline{{\rm MS}}$ approach when the partial invisible width is closed and does not allow the use of a full OS scheme. The scale dependence introduced by the mixed scheme is shown to be tracked through an analysis of a parametrisation of the tree-level cross-section and the $\beta$ constant of a specific coupling. We discuss how to minimise the scale dependence. The theoretical uncertainty brought by the scale dependence leads us to introduce a new criterion on the perturbativity of the IDM. This criterion further delimits the allowed parameter space which we investigate carefully by including a host of constraints, both theoretical and experimental, including in particular, new data from the LHC. We come up with a set of benchmark points that cover three different mechanisms for a viable relic density of DM: {\it i)} a dominance of co-annihilation into a fermion pair, { \it ii)} annihilation into 2 vector bosons of which one is off-shell that requires the calculation of a $2 \to 3$ process at one-loop, {\it iii)} annihilation that proceeds through the very narrow standard model Higgs resonance. Since the $2 \to 3$ vector boson channel features in all three channels and is essentially a build up on the simpler annihilation to OS vector bosons, we study the latter in detail in the present paper. We confirm again that the corrected cross-sections involve a parameter that represents rescattering in the dark sector that a tree-level computation in not sensitive to. |
2002.00796 | Andrea Vioque-Rodr\'iguez | Andrea Vioque-Rodr\'iguez, Angel G\'omez Nicola | Chiral symmetry restoration and the thermal $f_0(500)$ state | Proceedings of the Workshop "Light Cone 2019", 4 pages, 3 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analize the role played by the thermal $f_0(500)$ state or $\sigma$ in
chiral symmetry restoration. The temperature corrections to the spectral
properties of that state are included in order to provide a better description
of the scalar susceptibility $\chi_S$ around the transition region. We use the
Linear Sigma Model to establish the relation between $\chi_S$ and the $\sigma$
propagator, which is used as a benchmark to test the approach where $\chi_S$ is
saturated by the $f_0(500)$ inverse self-energy. Within such saturation
approach, a peak for $\chi_S$ around the chiral transition is obtained when
considering the $f_0(500)$ generated as a $\pi\pi$ scattering pole within
Unitarized Chiral Perturbation Theory at finite temperature. That approach
yields results complying with lattice data when the uncertainties of the
low-energy constants are taken into account. Those uncertainties and the
unitarization method are used to check the robustness of this approximation.
Finally, we will discuss some recent results within the chiral lagrangian
framework related to the topological susceptibility and its connection with
chiral and $U_A(1)$ restoration.
| [
{
"created": "Mon, 3 Feb 2020 14:46:47 GMT",
"version": "v1"
}
] | 2020-02-04 | [
[
"Vioque-Rodríguez",
"Andrea",
""
],
[
"Nicola",
"Angel Gómez",
""
]
] | We analize the role played by the thermal $f_0(500)$ state or $\sigma$ in chiral symmetry restoration. The temperature corrections to the spectral properties of that state are included in order to provide a better description of the scalar susceptibility $\chi_S$ around the transition region. We use the Linear Sigma Model to establish the relation between $\chi_S$ and the $\sigma$ propagator, which is used as a benchmark to test the approach where $\chi_S$ is saturated by the $f_0(500)$ inverse self-energy. Within such saturation approach, a peak for $\chi_S$ around the chiral transition is obtained when considering the $f_0(500)$ generated as a $\pi\pi$ scattering pole within Unitarized Chiral Perturbation Theory at finite temperature. That approach yields results complying with lattice data when the uncertainties of the low-energy constants are taken into account. Those uncertainties and the unitarization method are used to check the robustness of this approximation. Finally, we will discuss some recent results within the chiral lagrangian framework related to the topological susceptibility and its connection with chiral and $U_A(1)$ restoration. |
hep-ph/9709371 | Robert Peschanski | H. Navelet and R. Peschanski (SPhT,Saclay) | Selection rules at the quark-antiquark vertex of the QCD Pomeron | 12 pages, latex with tcilatex, no figure | Nucl.Phys.B515:269-278,1998 | 10.1016/S0550-3213(97)00788-8 | Saclay Preprint t97/108 | hep-ph hep-th | null | We derive the full analytic expression for the QCD eikonal coupling of a
quark-antiquark state to the exchanged gluon-gluon state in the BFKL formalism.
The formula is valid for all conformal spin configurations of the
quark-antiquark and gluon-gluon states. In particular, a new selection rule on
conformal spins characterizes the non-dominant BFKL components with intercept
below the Pomeron in the conformal-invariant framework.
| [
{
"created": "Wed, 17 Sep 1997 10:00:05 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Navelet",
"H.",
"",
"SPhT,Saclay"
],
[
"Peschanski",
"R.",
"",
"SPhT,Saclay"
]
] | We derive the full analytic expression for the QCD eikonal coupling of a quark-antiquark state to the exchanged gluon-gluon state in the BFKL formalism. The formula is valid for all conformal spin configurations of the quark-antiquark and gluon-gluon states. In particular, a new selection rule on conformal spins characterizes the non-dominant BFKL components with intercept below the Pomeron in the conformal-invariant framework. |
hep-ph/9711254 | Georg Weiglein | G. Weiglein | Higher-order corrections to precision observables in the Standard Model
and the MSSM | 15 pages, LaTeX, 5 Postscript figures; talk given at the XXI School
of Theoretical Physics, Ustron, September 1997, to appear in Acta Phys.
Polonica; the paper is also available via www at
http://www-itp.physik.uni-karlsruhe.de/prep/prep97/preplist97.html | Acta Phys.Polon.B28:2351-2365,1997 | null | KA-TP-19-1997 | hep-ph | null | A summary of recent results obtained for higher-order corrections to
precision observables in the Standard Model and the Minimal Supersymmetric
Standard Model is given. In the Standard Model electroweak two-loop results
valid for arbitrary values of the masses of the top quark, the Higgs boson and
the gauge bosons are discussed. For the example of two specific diagrams the
exact two-loop result is compared with the result of an expansion in the
top-quark mass up to next-to-leading order. Furthermore the Higgs-mass
dependence of the two-loop corrections to the relation between the gauge-boson
masses is analyzed. In the MSSM the exact gluonic corrections to $\Delta r$ are
derived. They are compared with the leading contribution entering via the
$\rho$ parameter.
| [
{
"created": "Thu, 6 Nov 1997 13:55:37 GMT",
"version": "v1"
}
] | 2011-03-02 | [
[
"Weiglein",
"G.",
""
]
] | A summary of recent results obtained for higher-order corrections to precision observables in the Standard Model and the Minimal Supersymmetric Standard Model is given. In the Standard Model electroweak two-loop results valid for arbitrary values of the masses of the top quark, the Higgs boson and the gauge bosons are discussed. For the example of two specific diagrams the exact two-loop result is compared with the result of an expansion in the top-quark mass up to next-to-leading order. Furthermore the Higgs-mass dependence of the two-loop corrections to the relation between the gauge-boson masses is analyzed. In the MSSM the exact gluonic corrections to $\Delta r$ are derived. They are compared with the leading contribution entering via the $\rho$ parameter. |
2304.09877 | Peter Denton | Peter B. Denton and Julia Gehrlein | Neutrino Constraints and the ATOMKI X17 Anomaly | 11 pages, 4 figures, comments welcome! v2: analysis expanded, results
similar, matches published version | Phys. Rev. D 108, 015009 (2023) | 10.1103/PhysRevD.108.015009 | CERN-TH-2023-053 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Recent data from the ATOMKI group continues to confirm their claim of the
existence of a new $\sim17$ MeV particle. We review and numerically analyze the
data and then put into context constraints from other experiments, notably
neutrino scattering experiments such as the latest reactor anti-neutrino
coherent elastic neutrino nucleus scattering data and unitarity constraints
from solar neutrino observations. We show that minimal scenarios are disfavored
and discuss the model requirements to evade these constraints.
| [
{
"created": "Wed, 19 Apr 2023 18:00:00 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Jul 2023 21:13:57 GMT",
"version": "v2"
}
] | 2023-07-11 | [
[
"Denton",
"Peter B.",
""
],
[
"Gehrlein",
"Julia",
""
]
] | Recent data from the ATOMKI group continues to confirm their claim of the existence of a new $\sim17$ MeV particle. We review and numerically analyze the data and then put into context constraints from other experiments, notably neutrino scattering experiments such as the latest reactor anti-neutrino coherent elastic neutrino nucleus scattering data and unitarity constraints from solar neutrino observations. We show that minimal scenarios are disfavored and discuss the model requirements to evade these constraints. |
2003.08558 | Ijaz Ahmed | Ijaz Ahmed, Fazal Khaliq, M. U. Ashraf, Taimoor Khurshid, Jamil
Muhammad | Pair production of heavy charged gauge bosons in $pp$ collisions at LHC | 21 pages, 16 figures | Physica Scripta (2023) | 10.1088/1402-4896/acef0a | Volume 98, Number 9 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Two opposite charged new heavy gauge boson pair production at the Large
Hadron Collider (LHC) is presented in this paper. These bosons are known as
$W^{'}$ boson due to the reason that it is the heavy version of Standard
Model's weak force carrier, the $W$ boson. The production cross section and
decay width in proton-proton ($pp$) collision at \sqrts~= 8 TeV are calculated
for different masses and coupling strengths of $W^{'}$. Efficiencies for
different signal regions and branching ratios for different decay channels are
computed. In this study, the pair production ($W^{'^{+}}W^{'^{-}}$) is
considered in emerging new physics as a result of $pp$ collision at \sqrts~= 8
TeV at the LHC with final state containing two tau ($\tau$) leptons and two
neutrinos (each $W^{'}$ decay to $\tau$ and its neutrino). The event selection
efficiency similar to the CMS experiment is used for the mass of $W^{'}$ to set
lower limits for different coupling strengths of $W^{'}$ and results are
presented in this work. For heavy gauge bosons, when coupling strength is
similar to that of Standard Model's $W$ boson, the mass of $W^{'}$ below 305
GeV are excluded at confidence level of $95\%$.
| [
{
"created": "Thu, 19 Mar 2020 03:45:38 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Nov 2022 02:40:46 GMT",
"version": "v2"
},
{
"created": "Wed, 26 Jul 2023 10:27:35 GMT",
"version": "v3"
}
] | 2023-08-28 | [
[
"Ahmed",
"Ijaz",
""
],
[
"Khaliq",
"Fazal",
""
],
[
"Ashraf",
"M. U.",
""
],
[
"Khurshid",
"Taimoor",
""
],
[
"Muhammad",
"Jamil",
""
]
] | Two opposite charged new heavy gauge boson pair production at the Large Hadron Collider (LHC) is presented in this paper. These bosons are known as $W^{'}$ boson due to the reason that it is the heavy version of Standard Model's weak force carrier, the $W$ boson. The production cross section and decay width in proton-proton ($pp$) collision at \sqrts~= 8 TeV are calculated for different masses and coupling strengths of $W^{'}$. Efficiencies for different signal regions and branching ratios for different decay channels are computed. In this study, the pair production ($W^{'^{+}}W^{'^{-}}$) is considered in emerging new physics as a result of $pp$ collision at \sqrts~= 8 TeV at the LHC with final state containing two tau ($\tau$) leptons and two neutrinos (each $W^{'}$ decay to $\tau$ and its neutrino). The event selection efficiency similar to the CMS experiment is used for the mass of $W^{'}$ to set lower limits for different coupling strengths of $W^{'}$ and results are presented in this work. For heavy gauge bosons, when coupling strength is similar to that of Standard Model's $W$ boson, the mass of $W^{'}$ below 305 GeV are excluded at confidence level of $95\%$. |
hep-ph/0307351 | Jean Orloff | J. Orloff | Leptogenesis: a Link between the Matter-Antimatter Asymmetry and
Neutrino Physics | 11 pages, 6 figures; presented at the XXXVIII Rencontres de Moriond:
Electroweak Interactions and Unified Theories, Les Arcs, France, 15-22 March
2003 | null | null | null | hep-ph | null | We review the experimental evidence for a net baryon density in cosmology,
and the theoretical mechanism for producing it, called leptogenesis, which
relies on the creation of a lepton asymmetry at an intermediate step. The
naturality of this mechanism and its possible relations with neutrino
oscillations are outlined.
| [
{
"created": "Tue, 29 Jul 2003 14:08:07 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Orloff",
"J.",
""
]
] | We review the experimental evidence for a net baryon density in cosmology, and the theoretical mechanism for producing it, called leptogenesis, which relies on the creation of a lepton asymmetry at an intermediate step. The naturality of this mechanism and its possible relations with neutrino oscillations are outlined. |
hep-ph/0003196 | Stephen Wong | J.I. Kapusta and S.M.H. Wong | Two-Loop Contribution to High Mass Dilepton Production by Quark-Gluon
Plasma | 5 latex pages, 6 embedded PS figures | Phys.Rev. C62 (2000) 027901 | 10.1103/PhysRevC.62.027901 | NUC-MINN-00/07-T | hep-ph | null | We calculate the order \alpha_s finite temperature correction to dilepton
production in quark-gluon plasma arising from the two-loop photon self-energy
diagrams for high invariant mass M >> T.
| [
{
"created": "Mon, 20 Mar 2000 20:15:22 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Kapusta",
"J. I.",
""
],
[
"Wong",
"S. M. H.",
""
]
] | We calculate the order \alpha_s finite temperature correction to dilepton production in quark-gluon plasma arising from the two-loop photon self-energy diagrams for high invariant mass M >> T. |
hep-ph/0410126 | Asmita Mukherjee | D. Chakrabarti, A. Mukherjee | Impact Parameter Dependent Parton Distributions for a Relativistic
Composite System | 4 pages, presented at Lightcone 2004, August 16-20, Amsterdam,
Netherlands | Few Body Syst.36:205-208,2005 | 10.1007/s00601-004-0102-y | null | hep-ph | null | We investigate the impact parameter dependent parton distributions for a
relativistic composite system in light-front framework. We express them in
terms of overlaps of light-cone wave functions for a self consistent two-body
spin-1/2 state, namely an electron dressed with a photon in QED. The pdfs are
distorted in the transverse space for transverse polarization of the state at
one loop level.
| [
{
"created": "Fri, 8 Oct 2004 10:18:19 GMT",
"version": "v1"
}
] | 2014-11-18 | [
[
"Chakrabarti",
"D.",
""
],
[
"Mukherjee",
"A.",
""
]
] | We investigate the impact parameter dependent parton distributions for a relativistic composite system in light-front framework. We express them in terms of overlaps of light-cone wave functions for a self consistent two-body spin-1/2 state, namely an electron dressed with a photon in QED. The pdfs are distorted in the transverse space for transverse polarization of the state at one loop level. |
1006.3011 | Ralf Hofmann | Carlos Falquez, Ralf Hofmann, and Tilo Baumbach | Modification of black-body radiance at low temperatures and frequencies | 10 pp, 5 figs; v2: slight changes in text, extended discussion of
Rydberg-atom experiment | Annalen Phys.522:904-911,2010 | 10.1002/andp.201000073 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In contrast to earlier reports, where the spectrum of the {\sl energy
density} of photonic black-body radiation modified by SU(2) effects was
discussed, we discuss the low-frequency spectrum of the {\sl radiance} at
temperatures ranging between 5 and 20 Kelvin. We conclude that compared to the
conventional theory the only observable effect is associated with the spectral
gap (total screening). We also discuss how a low-temperature black body cavity
under the influence of a sufficiently strong static electric field is forced to
emit according to Planck's radiation law (pure U(1) theory) even at low
frequencies and how this effect can be utilized to measure SU(2) induced
deviations.
| [
{
"created": "Tue, 15 Jun 2010 15:29:08 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Sep 2010 07:56:39 GMT",
"version": "v2"
}
] | 2010-11-29 | [
[
"Falquez",
"Carlos",
""
],
[
"Hofmann",
"Ralf",
""
],
[
"Baumbach",
"Tilo",
""
]
] | In contrast to earlier reports, where the spectrum of the {\sl energy density} of photonic black-body radiation modified by SU(2) effects was discussed, we discuss the low-frequency spectrum of the {\sl radiance} at temperatures ranging between 5 and 20 Kelvin. We conclude that compared to the conventional theory the only observable effect is associated with the spectral gap (total screening). We also discuss how a low-temperature black body cavity under the influence of a sufficiently strong static electric field is forced to emit according to Planck's radiation law (pure U(1) theory) even at low frequencies and how this effect can be utilized to measure SU(2) induced deviations. |
hep-ph/0510397 | Alessandro Papa | D.Yu. Ivanov and A. Papa | Electroproduction of two light vector mesons in next-to-leading BFKL | 9 pages, 4 figures; talk given by A. Papa at "New Trend in High
Energy Physics", Yalta, Sept. 10-17, 2005 | Eur.Phys.J. C49 (2007) 947-955 | null | null | hep-ph | null | We calculate the amplitude for the forward electroproduction of two light
vector mesons in next-to-leading order BFKL. This amplitude represents the
first next-to-leading order amplitude ever calculated for a collision process
between strongly interacting colorless particles.
| [
{
"created": "Sat, 29 Oct 2005 10:57:10 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Ivanov",
"D. Yu.",
""
],
[
"Papa",
"A.",
""
]
] | We calculate the amplitude for the forward electroproduction of two light vector mesons in next-to-leading order BFKL. This amplitude represents the first next-to-leading order amplitude ever calculated for a collision process between strongly interacting colorless particles. |
1803.01476 | Ji Xu | Wei Wang and Ji Xu | Weak Decays of Triply Heavy Baryons | 28 pages, 2 figures | Phys. Rev. D 97, 093007 (2018) | 10.1103/PhysRevD.97.093007 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | After the experimental establishment of doubly heavy baryons, baryons with
three quarks are the last missing pieces of the lowest-lying baryon multiplets
in quark model. In this work we study semileptonic and nonleptonic weak decays
of triply heavy baryons, $\Omega_{ccc}^{++}, \Omega_{ccb}^{+},
\Omega_{cbb}^{0}, \Omega_{bbb}^{-}$. Decay amplitudes for various channels are
parametrized in terms of a few SU(3) irreducible amplitudes. We point out that
branching fractions for Cabibbo allowed processes, $\Omega_{ccc}\to
(\Xi_{cc}^{++} \overline K^0, \Xi_{cc}^{++}K^-\pi^+, \Omega_{cc}^{+}\pi^+,
\Xi_{c}^+ D^+, \Xi_{c}^{\prime} D^+, \Lambda_c D^+\overline K^0, \Xi_{c}^+ D^0
\pi^+, \Xi_{c}^0 D^+\pi^+)$ may reach a few percents. We suggest our
experimental colleagues to perform a search at hadron colliders and the
electron and positron collisions in future, which will presumably lead to
discoveries of triply heavy baryons and complete the baryon multiplets. Using
the expanded amplitudes, we derive a number of relations for the partial widths
which can be examined in future.
| [
{
"created": "Mon, 5 Mar 2018 02:55:59 GMT",
"version": "v1"
}
] | 2018-05-30 | [
[
"Wang",
"Wei",
""
],
[
"Xu",
"Ji",
""
]
] | After the experimental establishment of doubly heavy baryons, baryons with three quarks are the last missing pieces of the lowest-lying baryon multiplets in quark model. In this work we study semileptonic and nonleptonic weak decays of triply heavy baryons, $\Omega_{ccc}^{++}, \Omega_{ccb}^{+}, \Omega_{cbb}^{0}, \Omega_{bbb}^{-}$. Decay amplitudes for various channels are parametrized in terms of a few SU(3) irreducible amplitudes. We point out that branching fractions for Cabibbo allowed processes, $\Omega_{ccc}\to (\Xi_{cc}^{++} \overline K^0, \Xi_{cc}^{++}K^-\pi^+, \Omega_{cc}^{+}\pi^+, \Xi_{c}^+ D^+, \Xi_{c}^{\prime} D^+, \Lambda_c D^+\overline K^0, \Xi_{c}^+ D^0 \pi^+, \Xi_{c}^0 D^+\pi^+)$ may reach a few percents. We suggest our experimental colleagues to perform a search at hadron colliders and the electron and positron collisions in future, which will presumably lead to discoveries of triply heavy baryons and complete the baryon multiplets. Using the expanded amplitudes, we derive a number of relations for the partial widths which can be examined in future. |
1312.2429 | Sergey Guts | Sergey Guts | Semiclassical treatment of pair creation in de Sitter space | null | null | 10.1007/s11232-014-0181-y | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a massive scalar field theory in de Sitter space. Using worldline
instanton approach, we calculate probability of pair production in weak-field
limit. In addition to exponential factor we derive pre-exponential factor.
Within this approach the vanishing probability for odd-dimensional de Sitter
space gets a clear geometrical interpretation. We find leading contribution to
imaginary part of two point correlator in $\phi^3$-theory.
| [
{
"created": "Mon, 9 Dec 2013 13:53:51 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Dec 2013 06:45:53 GMT",
"version": "v2"
},
{
"created": "Fri, 28 Mar 2014 20:11:02 GMT",
"version": "v3"
}
] | 2015-06-18 | [
[
"Guts",
"Sergey",
""
]
] | We study a massive scalar field theory in de Sitter space. Using worldline instanton approach, we calculate probability of pair production in weak-field limit. In addition to exponential factor we derive pre-exponential factor. Within this approach the vanishing probability for odd-dimensional de Sitter space gets a clear geometrical interpretation. We find leading contribution to imaginary part of two point correlator in $\phi^3$-theory. |
1304.5576 | Qingguo Zeng | Qing-Guo Zeng, Shuo Yang, Chong-Xing Yue, Lian-Song Chen | Production and decay of for the 125 GeV Higgs boson in the littlest
Higgs model with T-parity | 15 pages, 6 figures | null | 10.1088/1674-1137/37/5/054102 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by recent search results for the standard model (SM) Higgs boson at
the Large Hadron Collider (LHC), we revisit the Higgs phenomenology in the
littlest Higgs model with T-parity (LHT). We present the signal strength
modifier $\mu$ respectively for the main search channels $qq' \rightarrow
jjh\rightarrow jj\gamma\gamma$, $qq'\rightarrow Vh\rightarrow V\gamma \gamma$,
$qq'\rightarrow Vh \rightarrow Vbb$, $gg\rightarrow h \rightarrow
\gamma\gamma$, and $gg \rightarrow h \rightarrow VV$ in the LHT model. It is
found that an enhancement factor of $1.09-1.56$ in $qq' \rightarrow
jjh\rightarrow jj\gamma\gamma$ channel can be obtained for this model in Case B
with parameter $f$ in the range 1000 GeV$\sim 500$ GeV. However, the rates for
$b\bar{b}$, $\tau\bar{\tau}$ are significantly suppressed relative to the SM
predictions which are still consistent with the current sensitivity. It is
hoped that will be further tested with larger integrated luminosity at the LHC.
| [
{
"created": "Sat, 20 Apr 2013 01:41:50 GMT",
"version": "v1"
},
{
"created": "Sun, 12 May 2013 08:22:58 GMT",
"version": "v2"
}
] | 2015-06-15 | [
[
"Zeng",
"Qing-Guo",
""
],
[
"Yang",
"Shuo",
""
],
[
"Yue",
"Chong-Xing",
""
],
[
"Chen",
"Lian-Song",
""
]
] | Motivated by recent search results for the standard model (SM) Higgs boson at the Large Hadron Collider (LHC), we revisit the Higgs phenomenology in the littlest Higgs model with T-parity (LHT). We present the signal strength modifier $\mu$ respectively for the main search channels $qq' \rightarrow jjh\rightarrow jj\gamma\gamma$, $qq'\rightarrow Vh\rightarrow V\gamma \gamma$, $qq'\rightarrow Vh \rightarrow Vbb$, $gg\rightarrow h \rightarrow \gamma\gamma$, and $gg \rightarrow h \rightarrow VV$ in the LHT model. It is found that an enhancement factor of $1.09-1.56$ in $qq' \rightarrow jjh\rightarrow jj\gamma\gamma$ channel can be obtained for this model in Case B with parameter $f$ in the range 1000 GeV$\sim 500$ GeV. However, the rates for $b\bar{b}$, $\tau\bar{\tau}$ are significantly suppressed relative to the SM predictions which are still consistent with the current sensitivity. It is hoped that will be further tested with larger integrated luminosity at the LHC. |
1501.05879 | David d'Enterria | David d'Enterria, Krisztian Krajczar, Hannu Paukkunen | Top-quark production in proton-nucleus and nucleus-nucleus collisions at
LHC energies and beyond | 14 pages, 5 figs. Minor modifications. Version to appear in
Phys.Lett.B | null | 10.1016/j.physletb.2015.04.044 | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Single and pair top-quark production in proton-lead (p-Pb) and lead-lead
(Pb-Pb) collisions at the CERN Large Hadron Collider (LHC) and future circular
collider (FCC) energies, are studied with next-to-leading-order perturbative
QCD calculations including nuclear parton distribution functions. At the LHC,
the pair-production cross sections amount to sigma(t-tbar) = 3.4 mub in Pb-Pb
at sqrt(s) = 5.5 TeV, and sigma(t-tbar) = 60 nb in p-Pb at sqrt(s) = 8.8 TeV.
At the FCC energies of sqrt(s) = 39 and 63 TeV, the same cross sections are
factors of 90 and 55 times larger respectively. In the leptonic final-state
t-tbar --> W+b W-bbar --> b bbar l+l- nu+nu-, after typical acceptance and
efficiency cuts, one expects about 90 and 300 top-quarks per nominal LHC-year
and 4.7 10^4 and 10^5 per FCC-year in Pb-Pb and p-Pb collisions respectively.
The total t-tbar cross sections, dominated by gluon fusion processes, are
enhanced by 3--8% in nuclear compared to p-p collisions due to an overall net
gluon antishadowing, although different regions of their differential
distributions are depleted due to shadowing or EMC-effect corrections. The
rapidity distributions of the decay leptons in t-tbar processes can be used to
reduce the uncertainty on the Pb gluon density at high virtualities by up to
30% at the LHC (full heavy-ion programme), and by 70% per FCC-year. The cross
sections for single-top production in electroweak processes are also computed,
yielding about a factor of 30 smaller number of measurable top-quarks after
cuts, per system and per year.
| [
{
"created": "Fri, 23 Jan 2015 17:12:00 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Apr 2015 22:19:15 GMT",
"version": "v2"
}
] | 2015-05-20 | [
[
"d'Enterria",
"David",
""
],
[
"Krajczar",
"Krisztian",
""
],
[
"Paukkunen",
"Hannu",
""
]
] | Single and pair top-quark production in proton-lead (p-Pb) and lead-lead (Pb-Pb) collisions at the CERN Large Hadron Collider (LHC) and future circular collider (FCC) energies, are studied with next-to-leading-order perturbative QCD calculations including nuclear parton distribution functions. At the LHC, the pair-production cross sections amount to sigma(t-tbar) = 3.4 mub in Pb-Pb at sqrt(s) = 5.5 TeV, and sigma(t-tbar) = 60 nb in p-Pb at sqrt(s) = 8.8 TeV. At the FCC energies of sqrt(s) = 39 and 63 TeV, the same cross sections are factors of 90 and 55 times larger respectively. In the leptonic final-state t-tbar --> W+b W-bbar --> b bbar l+l- nu+nu-, after typical acceptance and efficiency cuts, one expects about 90 and 300 top-quarks per nominal LHC-year and 4.7 10^4 and 10^5 per FCC-year in Pb-Pb and p-Pb collisions respectively. The total t-tbar cross sections, dominated by gluon fusion processes, are enhanced by 3--8% in nuclear compared to p-p collisions due to an overall net gluon antishadowing, although different regions of their differential distributions are depleted due to shadowing or EMC-effect corrections. The rapidity distributions of the decay leptons in t-tbar processes can be used to reduce the uncertainty on the Pb gluon density at high virtualities by up to 30% at the LHC (full heavy-ion programme), and by 70% per FCC-year. The cross sections for single-top production in electroweak processes are also computed, yielding about a factor of 30 smaller number of measurable top-quarks after cuts, per system and per year. |
hep-ph/0209135 | K. R. S. Balaji | V. Krey and K.R.S. Balaji (Univ. of Dortmund) | Polarized J/psi production from B mesons at the Tevatron | 45 pages LaTex, 9 figures, 8 tables, matches version accepted for
publication in PRD | Phys.Rev.D67:054011,2003 | 10.1103/PhysRevD.67.054011 | DO-TH 02/15 | hep-ph | null | In the framework of NRQCD and parton model, we estimate in detail,the
production cross section for polarized J/psi from B meson decays. In order to
contrast with data, we also take into account additional J/psi production due
to decay of excited charmonium states. We calculate the helicity parameter,
alpha, and as an application, we study our results for the Tevatron. This is in
contrast to the earlier studies which were performed for prompt J/psi
production from p pbar collisions. Our estimates are, for J/psi from B decays,
alpha_{J/psi} = -0.04 +- 0.06 and for B decays to psi', alpha_{psi'}= -0.03 +-
0.07. These results have been evaluated in the J/psi transverse momentum
interval, 10 GeV < k_T < 30 GeV. In the limit of the color singlet model, alpha
shows a direct dependence on the Peterson parameter, thereby reflecting the
dynamics of the b quark hadronization. With Run II of the Tevatron, it is
expected that the fits for alpha will improve by about a factor of 50, leading
to better limits on the matrix elements.
| [
{
"created": "Thu, 12 Sep 2002 15:08:50 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Oct 2002 14:27:19 GMT",
"version": "v2"
},
{
"created": "Wed, 11 Dec 2002 09:57:16 GMT",
"version": "v3"
}
] | 2011-01-25 | [
[
"Krey",
"V.",
"",
"Univ. of Dortmund"
],
[
"Balaji",
"K. R. S.",
"",
"Univ. of Dortmund"
]
] | In the framework of NRQCD and parton model, we estimate in detail,the production cross section for polarized J/psi from B meson decays. In order to contrast with data, we also take into account additional J/psi production due to decay of excited charmonium states. We calculate the helicity parameter, alpha, and as an application, we study our results for the Tevatron. This is in contrast to the earlier studies which were performed for prompt J/psi production from p pbar collisions. Our estimates are, for J/psi from B decays, alpha_{J/psi} = -0.04 +- 0.06 and for B decays to psi', alpha_{psi'}= -0.03 +- 0.07. These results have been evaluated in the J/psi transverse momentum interval, 10 GeV < k_T < 30 GeV. In the limit of the color singlet model, alpha shows a direct dependence on the Peterson parameter, thereby reflecting the dynamics of the b quark hadronization. With Run II of the Tevatron, it is expected that the fits for alpha will improve by about a factor of 50, leading to better limits on the matrix elements. |
hep-ph/0206060 | Andrew Chamblin | Andrew Chamblin (LANL and Queen Mary) and Gouranga C. Nayak (LANL) | Black Hole Production at LHC: String Balls and Black Holes from pp and
Lead-lead Collisions | Added some discussion, final version to appear in Phys. Rev. D (rapid
communications) | Phys.Rev.D66:091901,2002 | 10.1103/PhysRevD.66.091901 | null | hep-ph hep-th nucl-th | null | If the fundamental planck scale is near a TeV, then parton collisions with
high enough center-of-mass energy should produce black holes. The production
rate for such black holes at LHC has been extensively studied for the case of a
proton-proton collision. In this paper, we extend this analysis to a lead-lead
collision at LHC. We find that the cross section for small black holes which
may in principle be produced in such a collision is either enhanced or
suppressed, depending upon the black hole mass. For example, for black holes
with a mass around 3 TeV we find that the differential black hole production
cross section, d\sigma/dM, in a typical lead-lead collision is up to 90 times
larger than that for black holes produced in a typical proton-proton collision.
We also discuss the cross-sections for `string ball' production in these
collisions. For string balls of mass about 1 (2) TeV, we find that the
differential production cross section in a typical lead-lead collision may be
enhanced by a factor up to 3300 (850) times that of a proton-proton collision
at LHC.
| [
{
"created": "Thu, 6 Jun 2002 19:55:18 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Jun 2002 01:33:59 GMT",
"version": "v2"
},
{
"created": "Thu, 7 Nov 2002 18:07:35 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Chamblin",
"Andrew",
"",
"LANL and Queen Mary"
],
[
"Nayak",
"Gouranga C.",
"",
"LANL"
]
] | If the fundamental planck scale is near a TeV, then parton collisions with high enough center-of-mass energy should produce black holes. The production rate for such black holes at LHC has been extensively studied for the case of a proton-proton collision. In this paper, we extend this analysis to a lead-lead collision at LHC. We find that the cross section for small black holes which may in principle be produced in such a collision is either enhanced or suppressed, depending upon the black hole mass. For example, for black holes with a mass around 3 TeV we find that the differential black hole production cross section, d\sigma/dM, in a typical lead-lead collision is up to 90 times larger than that for black holes produced in a typical proton-proton collision. We also discuss the cross-sections for `string ball' production in these collisions. For string balls of mass about 1 (2) TeV, we find that the differential production cross section in a typical lead-lead collision may be enhanced by a factor up to 3300 (850) times that of a proton-proton collision at LHC. |
1901.10483 | Pavel Fileviez Perez | Pavel Fileviez Perez, Clara Murgui | Gamma Lines from the Hidden Sector | to appear in PRD | Phys. Rev. D 100, 123007 (2019) | 10.1103/PhysRevD.100.123007 | null | hep-ph astro-ph.CO hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the visibility of gamma lines from dark matter annihilation. We
point out a class of theories for dark matter which predict the existence of
gamma lines with striking features. In these theories, the final state
radiation processes are highly suppressed and one could distinguish easily the
gamma lines from the continuum spectrum. We discuss the main experimental
bounds and show that one could test the predictions for gamma lines in the near
future in the context of simple gauge theories for dark matter.
| [
{
"created": "Tue, 29 Jan 2019 19:00:01 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Nov 2019 20:58:39 GMT",
"version": "v2"
}
] | 2019-12-18 | [
[
"Perez",
"Pavel Fileviez",
""
],
[
"Murgui",
"Clara",
""
]
] | We discuss the visibility of gamma lines from dark matter annihilation. We point out a class of theories for dark matter which predict the existence of gamma lines with striking features. In these theories, the final state radiation processes are highly suppressed and one could distinguish easily the gamma lines from the continuum spectrum. We discuss the main experimental bounds and show that one could test the predictions for gamma lines in the near future in the context of simple gauge theories for dark matter. |
hep-ph/9305254 | My Account | J. Lopez, D. Nanopoulos, and X. Wang | LEP and radiative electroweak breaking close the light gluino window | 6 pages, no figures, tex (harvmac), CERN-TH.6890, CTP-TAMU-25/93 | Phys.Lett.B313:241-244,1993 | 10.1016/0370-2693(93)91219-D | null | hep-ph | null | We show that the LEP lower bound on the chargino mass, in conjunction with
the well motivated theoretical requirement of radiative electroweak symmetry
breaking, imply an upper bound on the lightest Higgs boson mass
($m_h\lsim62\GeV$) in a supersymmetry breaking scenario where the gluino mass
is a few GeV. Moreover, Higgs searches at LEP in the context of this model
require $m_h\gsim61\GeV$. The remaining experimentally allowed region in the
five-dimensional parameter space of this light gluino model is severely
fine-tuned (with $\tan\beta=1.88-1.89$ and $m_t=114.0-114.3\GeV$) and
cosmologically troublesome (with a neutralino relic abundance over {\it
five-hundred times larger than allowed}). Modest improvements in sensitivity in
LEP Higgs searches and Tevatron top-quark searches should soon exclude this
theoretically disfavored model completely.
| [
{
"created": "Wed, 12 May 1993 17:03:56 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Lopez",
"J.",
""
],
[
"Nanopoulos",
"D.",
""
],
[
"Wang",
"X.",
""
]
] | We show that the LEP lower bound on the chargino mass, in conjunction with the well motivated theoretical requirement of radiative electroweak symmetry breaking, imply an upper bound on the lightest Higgs boson mass ($m_h\lsim62\GeV$) in a supersymmetry breaking scenario where the gluino mass is a few GeV. Moreover, Higgs searches at LEP in the context of this model require $m_h\gsim61\GeV$. The remaining experimentally allowed region in the five-dimensional parameter space of this light gluino model is severely fine-tuned (with $\tan\beta=1.88-1.89$ and $m_t=114.0-114.3\GeV$) and cosmologically troublesome (with a neutralino relic abundance over {\it five-hundred times larger than allowed}). Modest improvements in sensitivity in LEP Higgs searches and Tevatron top-quark searches should soon exclude this theoretically disfavored model completely. |
2301.01575 | Hao-Jie Jing | Hao-Jie Jing, Di Ben, Shu-Ming Wu, Jia-Jun Wu and Bing-Song Zou | Covariant orbital-spin scheme for any spin based on irreducible tensor | 37 pages and 2 figures | JHEP 06 (2023) 039 | 10.1007/JHEP06(2023)039 | null | hep-ph hep-ex hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In hadron spectrum physics, the partial wave analysis is a primary method
used to extract properties of hadronic resonances. The covariant orbital-spin
coupling scheme holds unique advantages over other partial wave methods due to
its Lorentz covariant form and determined orbital-spin quantum numbers. This
paper presents a general form of the covariant orbital-spin coupling scheme
based on the irreducible tensor of the homogeneous proper Lorentz group and its
little groups. A systematic procedure for constructing partial wave amplitude
in a Lorentz covariant way is provided, which can be applied to both massive
and massless particles. Specific examples are also included.
| [
{
"created": "Wed, 4 Jan 2023 12:49:01 GMT",
"version": "v1"
},
{
"created": "Tue, 16 May 2023 10:10:42 GMT",
"version": "v2"
},
{
"created": "Tue, 17 Oct 2023 15:36:18 GMT",
"version": "v3"
}
] | 2023-10-18 | [
[
"Jing",
"Hao-Jie",
""
],
[
"Ben",
"Di",
""
],
[
"Wu",
"Shu-Ming",
""
],
[
"Wu",
"Jia-Jun",
""
],
[
"Zou",
"Bing-Song",
""
]
] | In hadron spectrum physics, the partial wave analysis is a primary method used to extract properties of hadronic resonances. The covariant orbital-spin coupling scheme holds unique advantages over other partial wave methods due to its Lorentz covariant form and determined orbital-spin quantum numbers. This paper presents a general form of the covariant orbital-spin coupling scheme based on the irreducible tensor of the homogeneous proper Lorentz group and its little groups. A systematic procedure for constructing partial wave amplitude in a Lorentz covariant way is provided, which can be applied to both massive and massless particles. Specific examples are also included. |
hep-ph/0107227 | Boris Kopeliovich | B.Z. Kopeliovich, J. Nemchik, A.Schaefer, A.V. Tarasov | Color Transparency versus Quantum Coherence in Electroproduction of
Vector Mesons off Nuclei | Latex 57 pages and 17 figures | Phys.Rev. C65 (2002) 035201 | 10.1103/PhysRevC.65.035201 | null | hep-ph nucl-th | null | So far no theoretical tool for the comprehensive description of exclusive
electroproduction of vector mesons off nuclei at medium energies has been
developed. We suggest a light-cone QCD formalism which is valid at any energy
and incorporates formation effects (color transparency), the coherence length
and the gluon shadowing. At medium energies color transparency (CT) and the
onset of coherence length (CL) effects are not easily separated. Indeed,
although nuclear transparency measured by the HERMES experiment rises with Q^2,
it agrees with predictions of the vector dominance model (VDM) without any CT
effects. Our new results and observations are: (i) the good agreement with the
VDM found earlier is accidental and related to the specific correlation between
Q^2 and CL for HERMES kinematics; (ii) CT effects are much larger than have
been estimated earlier within the two channel approximation. They are even
stronger at low than at high energies and can be easily identified by HERMES or
at JLab; (iii) gluon shadowing which is important at high energies is
calculated and included; (iv) our parameter-free calculations explain well
available data for variation of nuclear transparency with virtuality and energy
of the photon; (v) predictions for electroproduction of \rho and \phi are
provided for future measurements at HERMES and JLab.
| [
{
"created": "Mon, 23 Jul 2001 14:43:09 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Kopeliovich",
"B. Z.",
""
],
[
"Nemchik",
"J.",
""
],
[
"Schaefer",
"A.",
""
],
[
"Tarasov",
"A. V.",
""
]
] | So far no theoretical tool for the comprehensive description of exclusive electroproduction of vector mesons off nuclei at medium energies has been developed. We suggest a light-cone QCD formalism which is valid at any energy and incorporates formation effects (color transparency), the coherence length and the gluon shadowing. At medium energies color transparency (CT) and the onset of coherence length (CL) effects are not easily separated. Indeed, although nuclear transparency measured by the HERMES experiment rises with Q^2, it agrees with predictions of the vector dominance model (VDM) without any CT effects. Our new results and observations are: (i) the good agreement with the VDM found earlier is accidental and related to the specific correlation between Q^2 and CL for HERMES kinematics; (ii) CT effects are much larger than have been estimated earlier within the two channel approximation. They are even stronger at low than at high energies and can be easily identified by HERMES or at JLab; (iii) gluon shadowing which is important at high energies is calculated and included; (iv) our parameter-free calculations explain well available data for variation of nuclear transparency with virtuality and energy of the photon; (v) predictions for electroproduction of \rho and \phi are provided for future measurements at HERMES and JLab. |
hep-ph/9702310 | Matthias Neubert | Matthias Neubert (CERN) | Theory of Inclusive B Decays | 13 pages, 3 figures; to appear in the Proceedings of the 4th KEK
Topical Conference on Flavour Physics, KEK, Japan, October 1996 | Nucl.Phys.Proc.Suppl.59:101-113,1997 | 10.1016/S0920-5632(97)00432-5 | CERN-TH/97-19 | hep-ph | null | We present the theory of inclusive decays of hadrons containing a heavy quark
and discuss its most important applications to the decays of B mesons. We also
review the theoretical understanding of the hadronic parameters lambda_1 and
lambda_2 (or mu_pi^2 and mu_G^2) entering the heavy-quark expansion.
| [
{
"created": "Wed, 12 Feb 1997 12:00:06 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Neubert",
"Matthias",
"",
"CERN"
]
] | We present the theory of inclusive decays of hadrons containing a heavy quark and discuss its most important applications to the decays of B mesons. We also review the theoretical understanding of the hadronic parameters lambda_1 and lambda_2 (or mu_pi^2 and mu_G^2) entering the heavy-quark expansion. |
hep-ph/0511208 | Nobuyuki Sawado | N.Sawado, N.Shiiki, S.Tanaka | Hopf Soliton Solutions from Low Energy Effective Action of SU(2)
Yang-Mills Theory | 18 pages, 7 figures | Mod.Phys.Lett. A21 (2006) 1189-1202 | 10.1142/S0217732306020627 | null | hep-ph | null | The Skyrme-Faddeev-Niemi (SFN) model which is an O(3) $\sigma$ model in three
dimensional space up to fourth-order in the first derivative is regarded as a
low-energy effective theory of SU(2) Yang-Mills theory. One can show from the
Wilsonian renormalization group argument that the effective action of
Yang-Mills theory recovers the SFN in the infrared region. However, the theory
contains another fourth-order term which destabilizes the soliton solution. In
this paper we derive an extended action including second derivative terms and
obtain soliton solutions numerically. A new topological lower bound formula is
infered for the extended action.
| [
{
"created": "Thu, 17 Nov 2005 08:11:29 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Sawado",
"N.",
""
],
[
"Shiiki",
"N.",
""
],
[
"Tanaka",
"S.",
""
]
] | The Skyrme-Faddeev-Niemi (SFN) model which is an O(3) $\sigma$ model in three dimensional space up to fourth-order in the first derivative is regarded as a low-energy effective theory of SU(2) Yang-Mills theory. One can show from the Wilsonian renormalization group argument that the effective action of Yang-Mills theory recovers the SFN in the infrared region. However, the theory contains another fourth-order term which destabilizes the soliton solution. In this paper we derive an extended action including second derivative terms and obtain soliton solutions numerically. A new topological lower bound formula is infered for the extended action. |
1709.08581 | Rusa Mandal | Priyotosh Bandyopadhyay, Eung Jin Chun and Rusa Mandal | Scalar Dark Matter in Leptophilic Two-Higgs-Doublet Model | Accepted version in Physics Letters B | Phys. Lett. B 779 (2018) 201-205 | 10.1016/j.physletb.2018.01.071 | IITH-PH-0002/17 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Two-Higgs-Doublet Model of Type-X in the large $\tan\beta$ limit becomes
leptophilic to allow a light pseudo-scalar $A$ and thus provides an explanation
of the muon $g-2$ anomaly. Introducing a singlet scalar dark matter $S$ in this
context, one finds that two important dark matter properties, nucleonic
scattering and self-annihilation, are featured separately by individual
couplings of dark matter to the two Higgs doublets. While one of the two
couplings is strongly constrained by direct detection experiments, the other
remains free to be adjusted for the relic density mainly through the process
$SS\to AA$. This leads to the $4\tau$ final states which can be probed by
galactic gamma ray detections.
| [
{
"created": "Mon, 25 Sep 2017 16:34:46 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Jan 2018 05:00:16 GMT",
"version": "v2"
}
] | 2018-02-15 | [
[
"Bandyopadhyay",
"Priyotosh",
""
],
[
"Chun",
"Eung Jin",
""
],
[
"Mandal",
"Rusa",
""
]
] | Two-Higgs-Doublet Model of Type-X in the large $\tan\beta$ limit becomes leptophilic to allow a light pseudo-scalar $A$ and thus provides an explanation of the muon $g-2$ anomaly. Introducing a singlet scalar dark matter $S$ in this context, one finds that two important dark matter properties, nucleonic scattering and self-annihilation, are featured separately by individual couplings of dark matter to the two Higgs doublets. While one of the two couplings is strongly constrained by direct detection experiments, the other remains free to be adjusted for the relic density mainly through the process $SS\to AA$. This leads to the $4\tau$ final states which can be probed by galactic gamma ray detections. |
2308.08474 | Erasmo Ferreira | Erasmo Ferreira and Anderson Kendi Kohara | Energy dependence of proton-proton elastic scattering at large momentum
transfer | 6 pages, 5 figures and 1 table | Physics Letters B 846 (2023) 138230 | 10.1016/j.physletb.2023.138230 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The measurements of proton-proton elastic scattering for large momentum
transfer at energies in the range $\approx$ 20 to 60 GeV show a simple
behaviour of form $d \sigma/dt \approx {\rm const}~|t|^{-8}$, apparently with
no energy dependence. In the present work detailed analysis of the data shows a
decrease of the magnitude of the tail with the energy, still with preservation
of the power $|t|^{-8}$. The analysis allows the definition of a band for the
energy dependence with the form of a power of the strong coupling
$\alpha_S^{1.57}$. The rate of decrease describes very well the data at the
distant energy $\sqrt{s}$ = 13 TeV, with reduction of the cross section by a
factor 5.71. This result gives prediction for new experiments at high energies,
and opens important question for theoretical investigation.
| [
{
"created": "Wed, 16 Aug 2023 16:24:28 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Oct 2023 12:10:20 GMT",
"version": "v2"
}
] | 2023-10-23 | [
[
"Ferreira",
"Erasmo",
""
],
[
"Kohara",
"Anderson Kendi",
""
]
] | The measurements of proton-proton elastic scattering for large momentum transfer at energies in the range $\approx$ 20 to 60 GeV show a simple behaviour of form $d \sigma/dt \approx {\rm const}~|t|^{-8}$, apparently with no energy dependence. In the present work detailed analysis of the data shows a decrease of the magnitude of the tail with the energy, still with preservation of the power $|t|^{-8}$. The analysis allows the definition of a band for the energy dependence with the form of a power of the strong coupling $\alpha_S^{1.57}$. The rate of decrease describes very well the data at the distant energy $\sqrt{s}$ = 13 TeV, with reduction of the cross section by a factor 5.71. This result gives prediction for new experiments at high energies, and opens important question for theoretical investigation. |
2308.15849 | Quan-Feng Wu | Quan-feng Wu and Xun-Jie Xu | Shedding light on neutrino self-interactions with solar antineutrino
searches | 21 pages, 5 figures, the revised version accepted by JCAP | null | 10.1088/1475-7516/2024/02/037 | null | hep-ph astro-ph.CO astro-ph.HE astro-ph.SR hep-ex | http://creativecommons.org/licenses/by/4.0/ | Solar antineutrinos are absent in the standard solar model prediction.
Consequently, solar antineutrino searches emerge as a powerful tool to probe
new physics capable of converting neutrinos into antineutrinos. In this study,
we highlight that neutrino self-interactions, recently gaining considerable
attention due to their cosmological and astrophysical implications, can lead to
significant solar antineutrino production. We systematically explore various
types of four-fermion effective operators and light scalar mediators for
neutrino self-interactions. By estimating the energy spectra and event rates of
solar antineutrinos at prospective neutrino detectors such as JUNO,
Hyper-Kamiokande, and THEIA, we reveal that solar antineutrino searches can
impose stringent constraints on neutrino self-interactions and probe the
parameter space favored by the Hubble tension.
| [
{
"created": "Wed, 30 Aug 2023 08:35:01 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Feb 2024 15:34:47 GMT",
"version": "v2"
}
] | 2024-02-26 | [
[
"Wu",
"Quan-feng",
""
],
[
"Xu",
"Xun-Jie",
""
]
] | Solar antineutrinos are absent in the standard solar model prediction. Consequently, solar antineutrino searches emerge as a powerful tool to probe new physics capable of converting neutrinos into antineutrinos. In this study, we highlight that neutrino self-interactions, recently gaining considerable attention due to their cosmological and astrophysical implications, can lead to significant solar antineutrino production. We systematically explore various types of four-fermion effective operators and light scalar mediators for neutrino self-interactions. By estimating the energy spectra and event rates of solar antineutrinos at prospective neutrino detectors such as JUNO, Hyper-Kamiokande, and THEIA, we reveal that solar antineutrino searches can impose stringent constraints on neutrino self-interactions and probe the parameter space favored by the Hubble tension. |
hep-ph/9807244 | Joan Sola | Joan Sola | Quantum SUSY signatures in low and high energy processes | 17 pages, LaTeX, 7 figs included with epsfig. Talk at the 5th
International Workshop on High Energy Physics Phenomenology (WHEPP-5). To
appear in the Proceedings | Pramana 51 (1998) 239-248 | 10.1007/BF02827495 | UAB-FT-444 | hep-ph | null | In the search for phenomenological evidence of supersymmetry through the
indirect method of quantum signatures, it is useful to seek correlations of the
non-standard quantum effects in low and high energy proceses, such as those
involving on one hand the properties of the B-mesons and on the other hand the
physics of the top quark and of the Higgs bosons. There are regions of the MSSM
parameter space where the potential quantum SUSY signatures in the two energy
regimes are strongly interwoven and therefore the eventual detection of these
correlated quantum effects would strongly point towards the existence of
underlying supersymmetric dynamics.
| [
{
"created": "Fri, 3 Jul 1998 17:41:12 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Sola",
"Joan",
""
]
] | In the search for phenomenological evidence of supersymmetry through the indirect method of quantum signatures, it is useful to seek correlations of the non-standard quantum effects in low and high energy proceses, such as those involving on one hand the properties of the B-mesons and on the other hand the physics of the top quark and of the Higgs bosons. There are regions of the MSSM parameter space where the potential quantum SUSY signatures in the two energy regimes are strongly interwoven and therefore the eventual detection of these correlated quantum effects would strongly point towards the existence of underlying supersymmetric dynamics. |
1202.4226 | Premomoy Ghosh | Premomoy Ghosh | Two-component model in quantum statistical framework compared with
multiplicity distributions in proton-proton collisions at energies up to
$\sqrt {s}$ = 7 TeV | 6 pages 7 figures. Published in Physics Letters B. arXiv admin note:
substantial text overlap with arXiv:1107.1291 | null | 10.1016/j.physletb.2011.10.033 | null | hep-ph hep-ex nucl-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Proton-proton collisions at new high energies ($\sqrt {s} =$ 2.36 and 7 TeV)
at LHC resulted into greater mean multiplicities ($<n>$) of charged particles
in the mid-rapidity region than estimated ones by different models and event
generators. Another significant observation in multiplicity data is the change
in slope in the distribution of primary charged hadrons in symmetric
pseudorapidity interval $|\eta|<$2.4. The change is most prominent with data at
$\sqrt{s} = 7$ TeV. These new observations merit further studies. We consider a
two-component model of particle production to analyze multiplicity
distributions of charged hadrons from proton-proton collisions at
centre-of-mass energies $\sqrt{s} = $ 0.9, 2.36 and 7 TeV in symmetric
pseudorapidity intervals $|\eta|$ of increasing width around the centre-of-mass
pseudorapidity $\eta_{cm} = 0$. The model, based on quantum statistical (QS)
formalism, describes multiplicity distribution by convolution of a Negative
Binomial Distribution (NBD), representing a chaotic component, and a Poisson
Distribution (PD), representing a coherent component of particle productions.
The behaviour of characteristic parameters of the model is followed by the LHC
data, while a scaling law, involving information entropy in quantum statistical
viewpoint and derived as a function of chaotic multiplicity obtained from the
two-component model, is not obeyed by the data, satisfactorily. An attempt to
match the measured multiplicity distributions and suggested convolutions with
values of characteristic parameters extracted from the data confirms
disagreement between the data and the model.
| [
{
"created": "Mon, 20 Feb 2012 05:11:14 GMT",
"version": "v1"
}
] | 2012-02-21 | [
[
"Ghosh",
"Premomoy",
""
]
] | Proton-proton collisions at new high energies ($\sqrt {s} =$ 2.36 and 7 TeV) at LHC resulted into greater mean multiplicities ($<n>$) of charged particles in the mid-rapidity region than estimated ones by different models and event generators. Another significant observation in multiplicity data is the change in slope in the distribution of primary charged hadrons in symmetric pseudorapidity interval $|\eta|<$2.4. The change is most prominent with data at $\sqrt{s} = 7$ TeV. These new observations merit further studies. We consider a two-component model of particle production to analyze multiplicity distributions of charged hadrons from proton-proton collisions at centre-of-mass energies $\sqrt{s} = $ 0.9, 2.36 and 7 TeV in symmetric pseudorapidity intervals $|\eta|$ of increasing width around the centre-of-mass pseudorapidity $\eta_{cm} = 0$. The model, based on quantum statistical (QS) formalism, describes multiplicity distribution by convolution of a Negative Binomial Distribution (NBD), representing a chaotic component, and a Poisson Distribution (PD), representing a coherent component of particle productions. The behaviour of characteristic parameters of the model is followed by the LHC data, while a scaling law, involving information entropy in quantum statistical viewpoint and derived as a function of chaotic multiplicity obtained from the two-component model, is not obeyed by the data, satisfactorily. An attempt to match the measured multiplicity distributions and suggested convolutions with values of characteristic parameters extracted from the data confirms disagreement between the data and the model. |
hep-ph/9501261 | Thomas G. Rizzo | Thomas G. Rizzo | Extended Gauge Sectors | 6 pages plus 18 figure, LaTex. Figures soon to be available by
anonymous ftp at ftp://preprint.slac.stanford.edu/preprints/hep-ph/ or via
WWW at http://libnext.slac.stanford.edu:5080/hep-ph/ | null | null | SLAC-PUB-95-6741 | hep-ph | null | Present and future prospects for the discovery of new gauge bosons, $Z'$ and
$W'$, are reviewed. Particular attention is paid to hadron and $e^+e^-$
collider searches for the $W'$ of the Left-Right Symmetric Model. (Presented at
the {\it Fourth International Conference on Physics Beyond the Standard Model},
Lake Tahoe, CA, December 13-18, 1994.)
| [
{
"created": "Tue, 10 Jan 1995 21:40:12 GMT",
"version": "v1"
}
] | 2016-09-01 | [
[
"Rizzo",
"Thomas G.",
""
]
] | Present and future prospects for the discovery of new gauge bosons, $Z'$ and $W'$, are reviewed. Particular attention is paid to hadron and $e^+e^-$ collider searches for the $W'$ of the Left-Right Symmetric Model. (Presented at the {\it Fourth International Conference on Physics Beyond the Standard Model}, Lake Tahoe, CA, December 13-18, 1994.) |
1209.4243 | Stefano Lottini Dr. | Elina Seel, Dominik Smith, Stefano Lottini, Francesco Giacosa | Thermodynamics of the O(3) model in 1+1 dimensions: lattice vs.
analytical results | 29 pages, 7 figures; version accepted for publication in Journal of
High-Energy Physics (JHEP) | Journal of High Energy Physics (JHEP) 1307 010 (2013) | 10.1007/JHEP07(2013)010 | null | hep-ph hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A detailed study of the thermodynamics of the O(N=3) model in 1+1 dimensions
is presented, employing a two-particle-irreducible resummation prescription as
well as fully nonperturbative finite-temperature lattice simulations. The
analytical results are computed using the Cornwall-Jackiw-Tomboulis (CJT)
formalism and the auxiliary field method to one- and to two-loop order. The
lattice results are obtained through Monte Carlo simulation for various lattice
spacings. The analytical and lattice results for pressure, trace anomaly, and
energy density, resembling closely those of four-dimensional Yang-Mills
theories, are compared with each other. We find that to one-loop order there is
a good correspondence between the CJT formalism and the lattice study for low
temperatures. However, at high T the two-loop calculation fares better,
correcting for the overestimation from the former approximation.
| [
{
"created": "Wed, 19 Sep 2012 13:57:34 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Jul 2013 19:47:19 GMT",
"version": "v2"
}
] | 2013-07-09 | [
[
"Seel",
"Elina",
""
],
[
"Smith",
"Dominik",
""
],
[
"Lottini",
"Stefano",
""
],
[
"Giacosa",
"Francesco",
""
]
] | A detailed study of the thermodynamics of the O(N=3) model in 1+1 dimensions is presented, employing a two-particle-irreducible resummation prescription as well as fully nonperturbative finite-temperature lattice simulations. The analytical results are computed using the Cornwall-Jackiw-Tomboulis (CJT) formalism and the auxiliary field method to one- and to two-loop order. The lattice results are obtained through Monte Carlo simulation for various lattice spacings. The analytical and lattice results for pressure, trace anomaly, and energy density, resembling closely those of four-dimensional Yang-Mills theories, are compared with each other. We find that to one-loop order there is a good correspondence between the CJT formalism and the lattice study for low temperatures. However, at high T the two-loop calculation fares better, correcting for the overestimation from the former approximation. |
hep-ph/9905411 | C. A. Dominguez | C.A. Dominguez and K. Schilcher | Finite energy chiral sum rules in QCD | 6 pages, 6 figures. Invited talk at WIN99, 17th International
Workshop on Weak Interactions and Neutrinos, Cape Town, South Africa, January
1999. To be published in the proceedings (World Scientific) | null | null | UCT-TP-257/99 | hep-ph | null | A set of well known chiral sum rules, expected to be valid in QCD, is
confronted with experimental data on the vector and axial-vector hadronic
spectral functions, obtained from tau-lepton decay by the ALEPH collaboration.
The Das-Mathur-Okubo sum rule, the first and second Weinberg sum rules, and the
electromagnetic pion mass difference sum rule are not well saturated by the
data. Instead, a modified set of sum rules having additional weight factors
that vanish at the end of the integration range on the real axis, is found to
be precociously saturated by the data to a remarkable extent.
| [
{
"created": "Thu, 20 May 1999 06:46:42 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Dominguez",
"C. A.",
""
],
[
"Schilcher",
"K.",
""
]
] | A set of well known chiral sum rules, expected to be valid in QCD, is confronted with experimental data on the vector and axial-vector hadronic spectral functions, obtained from tau-lepton decay by the ALEPH collaboration. The Das-Mathur-Okubo sum rule, the first and second Weinberg sum rules, and the electromagnetic pion mass difference sum rule are not well saturated by the data. Instead, a modified set of sum rules having additional weight factors that vanish at the end of the integration range on the real axis, is found to be precociously saturated by the data to a remarkable extent. |
hep-ph/9910440 | null | Jan-e Alam, Sourav Sarkar, Pradip Roy, T. Hatsuda and Bikash Sinha | Electromagnetic Signals of Hot Hadronic Matter | 12 pages, one LaTeX file, four eps files | null | null | null | hep-ph | null | The photon and dilepton emission rates from quark gluon plasma and hot
hadronic matter have been evaluated. The in-medium modifications of the
particles appearing in the internal loop of the self energy diagram are taken
into account by using a phenomenological effective Lagrangian approach,
Brown-Rho and Nambu scaling scenarios. We note that the in-medium effects on
the low invariant mass distribution of dilepton and transverse momentum spectra
of photon are clearly visible.
| [
{
"created": "Fri, 22 Oct 1999 09:26:05 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Alam",
"Jan-e",
""
],
[
"Sarkar",
"Sourav",
""
],
[
"Roy",
"Pradip",
""
],
[
"Hatsuda",
"T.",
""
],
[
"Sinha",
"Bikash",
""
]
] | The photon and dilepton emission rates from quark gluon plasma and hot hadronic matter have been evaluated. The in-medium modifications of the particles appearing in the internal loop of the self energy diagram are taken into account by using a phenomenological effective Lagrangian approach, Brown-Rho and Nambu scaling scenarios. We note that the in-medium effects on the low invariant mass distribution of dilepton and transverse momentum spectra of photon are clearly visible. |
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