id stringlengths 9 14 | submitter stringlengths 1 56 ⌀ | authors stringlengths 5 7.68k | title stringlengths 3 299 | comments stringlengths 1 1.15k ⌀ | journal-ref stringlengths 9 298 ⌀ | doi stringlengths 12 97 ⌀ | report-no stringlengths 3 341 ⌀ | categories stringclasses 869 values | license stringclasses 9 values | orig_abstract stringlengths 16 2.44k | versions listlengths 1 39 | update_date stringlengths 10 10 | authors_parsed listlengths 1 565 | abstract stringlengths 13 2.44k |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/0209277 | null | Debasish Majumdar | Detection Rates for Kaluza-Klein Dark Matter | Submitted to Phys. Rev. D | Phys.Rev. D67 (2003) 095010 | 10.1103/PhysRevD.67.095010 | null | hep-ph | null | We consider the lightest Kaluza-Klein particle at N=1 mode (LKP) of universal
extra dimension to be the candidate for Dark Matter and predict the detection
rates for such particles for Germenium and NaI detectors. We have also
calculated the nature of annual modulation for the signals in these two types
of detectors for LKP Dark Matter. The rates with different values of speed of
solar system in the Galactic rest frame are also evaluated.
| [
{
"created": "Tue, 24 Sep 2002 11:08:27 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Majumdar",
"Debasish",
""
]
] | We consider the lightest Kaluza-Klein particle at N=1 mode (LKP) of universal extra dimension to be the candidate for Dark Matter and predict the detection rates for such particles for Germenium and NaI detectors. We have also calculated the nature of annual modulation for the signals in these two types of detectors for LKP Dark Matter. The rates with different values of speed of solar system in the Galactic rest frame are also evaluated. |
1410.3367 | Jennifer Girrbach-Noe | Jennifer Girrbach-Noe | News on $B\to K^{(*)}\nu\bar\nu$ in the Standard Model and beyond | Proceedings of the 8th International Workshop on the CKM Unitarity
Triangle, 8-12 September 2014, Vienna, Austria; v2: references added | null | null | FLAVOUR(267104)-ERC-86 | hep-ph hep-ex hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An analysis of the rare B decays $B\to K^{(*)}\nu\bar\nu$ is presented both
within the SM and beyond. The SM predictions for the branching ratios are
updated and uncertainties reduced. For the NP analysis both a model independent
approach is used and concrete NP models are studied. The relations between
$b\to s\nu\bar\nu$ and $b\to s\ell^+\ell^-$ transitions are analysed in detail.
| [
{
"created": "Mon, 13 Oct 2014 15:54:58 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Oct 2014 07:24:09 GMT",
"version": "v2"
}
] | 2014-10-22 | [
[
"Girrbach-Noe",
"Jennifer",
""
]
] | An analysis of the rare B decays $B\to K^{(*)}\nu\bar\nu$ is presented both within the SM and beyond. The SM predictions for the branching ratios are updated and uncertainties reduced. For the NP analysis both a model independent approach is used and concrete NP models are studied. The relations between $b\to s\nu\bar\nu$ and $b\to s\ell^+\ell^-$ transitions are analysed in detail. |
hep-ph/0109075 | Yuval Grossman | Yuval Grossman | Leptonic Flavor and CP Violation | 8 pages, latex, no figures. Invited talk given at KAON 2001, Pisa,
Italy, June 12 - 17, 2001 | Pramana62:269-281,2004 | 10.1007/BF02705088 | null | hep-ph | null | We discuss how neutrino oscillation experiments can probe new sources of
leptonic flavor and CP violation.
| [
{
"created": "Mon, 10 Sep 2001 08:38:55 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Grossman",
"Yuval",
""
]
] | We discuss how neutrino oscillation experiments can probe new sources of leptonic flavor and CP violation. |
2403.03770 | Jorge Segovia | P. G. Ortega, D. R. Entem, F. Fern\'andez and J. Segovia | An assessment of $\mathbf{\Upsilon}$-states above $\mathbf{B\bar
B}$-threshold using a constituent-quark-model based meson-meson
coupled-channels framework | 11 pages, 2 figures, 6 tables | null | null | null | hep-ph hep-ex hep-lat nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The $\Upsilon(10753)$ state has been recently observed by the Belle and
Belle~II collaborations with enough global significance to motivate an
assessment of the high-energy spectrum usually predicted by any reasonable
\emph{na\"ive} quark model. In the framework of a constituent quark model which
satisfactorily describes a wide range of properties of conventional hadrons
containing heavy quarks, the quark-antiquark and meson-meson degrees of freedom
have been incorporated with the goal of elucidating the influence of
open-bottom meson-meson thresholds into the $\Upsilon$ states whose masses are
within the energy range of the $\Upsilon(10753)$'s mass. It is well known that
such effects could be relevant enough as to generate dynamically new states and
thus provide a plausible explanation of the nature of the $\Upsilon(10753)$
state. In particular, we have performed a coupled-channels calculation in which
the bare states $\Upsilon(4S)$, $\Upsilon(3D)$, $\Upsilon(5S)$ and
$\Upsilon(4D)$ are considered together with the threshold channels $B\bar{B}$,
$B\bar{B}^\ast$, $B^\ast \bar{B}^\ast$, $B_s\bar{B}_s$, $B_s\bar{B}_s^\ast$ and
$B_s^\ast \bar{B}_s^\ast$. Among the results we have described, the following
conclusions are of particular interest: (i) a richer complex spectrum is gained
when thresholds are present and bare bound states are sufficiently
non-relativistic; (ii) those poles obtained in the complex energy plane do not
have to appear as simple peaks in the relevant cross sections; and (iii) the
$\Upsilon(10750)$ candidate is interpreted as a dressed hadronic resonance
whose structure is an equally mixture of a conventional $b\bar b$ state and
$B^\ast \bar B^\ast$ molecule.
| [
{
"created": "Wed, 6 Mar 2024 15:04:41 GMT",
"version": "v1"
}
] | 2024-03-07 | [
[
"Ortega",
"P. G.",
""
],
[
"Entem",
"D. R.",
""
],
[
"Fernández",
"F.",
""
],
[
"Segovia",
"J.",
""
]
] | The $\Upsilon(10753)$ state has been recently observed by the Belle and Belle~II collaborations with enough global significance to motivate an assessment of the high-energy spectrum usually predicted by any reasonable \emph{na\"ive} quark model. In the framework of a constituent quark model which satisfactorily describes a wide range of properties of conventional hadrons containing heavy quarks, the quark-antiquark and meson-meson degrees of freedom have been incorporated with the goal of elucidating the influence of open-bottom meson-meson thresholds into the $\Upsilon$ states whose masses are within the energy range of the $\Upsilon(10753)$'s mass. It is well known that such effects could be relevant enough as to generate dynamically new states and thus provide a plausible explanation of the nature of the $\Upsilon(10753)$ state. In particular, we have performed a coupled-channels calculation in which the bare states $\Upsilon(4S)$, $\Upsilon(3D)$, $\Upsilon(5S)$ and $\Upsilon(4D)$ are considered together with the threshold channels $B\bar{B}$, $B\bar{B}^\ast$, $B^\ast \bar{B}^\ast$, $B_s\bar{B}_s$, $B_s\bar{B}_s^\ast$ and $B_s^\ast \bar{B}_s^\ast$. Among the results we have described, the following conclusions are of particular interest: (i) a richer complex spectrum is gained when thresholds are present and bare bound states are sufficiently non-relativistic; (ii) those poles obtained in the complex energy plane do not have to appear as simple peaks in the relevant cross sections; and (iii) the $\Upsilon(10750)$ candidate is interpreted as a dressed hadronic resonance whose structure is an equally mixture of a conventional $b\bar b$ state and $B^\ast \bar B^\ast$ molecule. |
1211.0512 | Steve Blanchet | Steve Blanchet and Pasquale Di Bari | The minimal scenario of leptogenesis | 37 pages, 4 figures; invited review chapter for the "Focus on the
Origin of Matter" issue published in the New Journal of Physics | null | 10.1088/1367-2630/14/12/125012 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review the main features and results of thermal leptogenesis within the
type I seesaw mechanism, the minimal extension of the Standard Model explaining
neutrino masses and mixing. After presenting the simplest approach, the vanilla
scenario, we discuss various important developments in recent years, such as
the inclusion of lepton and heavy neutrino flavour effects, a description
beyond a hierarchical heavy neutrino mass spectrum and an improved kinetic
description within the density matrix and the closed-time-path formalisms. We
also discuss how leptogenesis can ultimately represent an important
phenomenological tool to test the seesaw mechanism and the underlying model of
new physics.
| [
{
"created": "Fri, 2 Nov 2012 18:14:37 GMT",
"version": "v1"
}
] | 2015-06-12 | [
[
"Blanchet",
"Steve",
""
],
[
"Di Bari",
"Pasquale",
""
]
] | We review the main features and results of thermal leptogenesis within the type I seesaw mechanism, the minimal extension of the Standard Model explaining neutrino masses and mixing. After presenting the simplest approach, the vanilla scenario, we discuss various important developments in recent years, such as the inclusion of lepton and heavy neutrino flavour effects, a description beyond a hierarchical heavy neutrino mass spectrum and an improved kinetic description within the density matrix and the closed-time-path formalisms. We also discuss how leptogenesis can ultimately represent an important phenomenological tool to test the seesaw mechanism and the underlying model of new physics. |
hep-ph/0007276 | Song Wanyoung | S.Y. Choi (Chonbuk National U.), M. Guchait (DESY), H.S. Song
(CTP/Seoul National U.) and W.Y. Song (CTP/Seoul National U.) | Measuring MSSM CP-violating Phases through Spin Correlated
Supersymmetric Tri-lepton Signatures at the Tevatron | 46 pages, 14 eps figures | null | null | DESY 00-105, SNUTP 00-018 | hep-ph | null | We provide a detailed analysis of the supersymmetric tri-lepton signals for
sparticle searches at the Tevatron in the minimal supersymmetric standard model
with general CP-violating phases but without flavor mixing among sfermions of
different generation. The stringent experimental constraints on the
CP-violating phases from the electron and neutron electric dipole moments are
included in the analysis for two exemplary scenarios of the SUSY parameters;
one with decoupled first two generation sfermions and the other with
non-decoupled sfermions. In both scenarios, the production cross section and
the branching fractions of the leptonic chargino and neutralino decays are
sensitive to CP-violating phases. The production-decay spin correlations lead
to several non-trivial CP-even observables such as the lepton invariant mass
distribution and the lepton angular distribution, and several interesting T-odd
(CP-odd) momentum triple products. The possibility of measuring the
CP-violating phases directly through those T-odd observables is investigated in
detail.
| [
{
"created": "Tue, 25 Jul 2000 10:43:13 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Choi",
"S. Y.",
"",
"Chonbuk National U."
],
[
"Guchait",
"M.",
"",
"DESY"
],
[
"Song",
"H. S.",
"",
"CTP/Seoul National U."
],
[
"Song",
"W. Y.",
"",
"CTP/Seoul National U."
]
] | We provide a detailed analysis of the supersymmetric tri-lepton signals for sparticle searches at the Tevatron in the minimal supersymmetric standard model with general CP-violating phases but without flavor mixing among sfermions of different generation. The stringent experimental constraints on the CP-violating phases from the electron and neutron electric dipole moments are included in the analysis for two exemplary scenarios of the SUSY parameters; one with decoupled first two generation sfermions and the other with non-decoupled sfermions. In both scenarios, the production cross section and the branching fractions of the leptonic chargino and neutralino decays are sensitive to CP-violating phases. The production-decay spin correlations lead to several non-trivial CP-even observables such as the lepton invariant mass distribution and the lepton angular distribution, and several interesting T-odd (CP-odd) momentum triple products. The possibility of measuring the CP-violating phases directly through those T-odd observables is investigated in detail. |
0708.0730 | Christian Schwinn | Christian Schwinn (RWTH Aachen) | Effective Theory Approach to W-Pair Production near Threshold | 7 pages (ilcws07.cls included), to appear in the proceedings of the
International Linear Collider Workshop (LCWS/ILC07), 30 May - 3 Jun 2007,
Hamburg, Germany | ECONF C0705302:LOOP03,2007 | null | SFB/CPP-07-44 | hep-ph | null | In this talk, I review the effective theory approach to unstable particle
production and present results of a calculation of the process e- e+ ->mu-
nubar_mu u dbar X near the W-pair production threshold up to next-to-leading
order in GammaW/MW ~ alpha ~ v^2. The remaining theoretical uncertainty and the
impact on the measurement of the W mass is discussed.
| [
{
"created": "Mon, 6 Aug 2007 09:33:20 GMT",
"version": "v1"
}
] | 2009-02-16 | [
[
"Schwinn",
"Christian",
"",
"RWTH Aachen"
]
] | In this talk, I review the effective theory approach to unstable particle production and present results of a calculation of the process e- e+ ->mu- nubar_mu u dbar X near the W-pair production threshold up to next-to-leading order in GammaW/MW ~ alpha ~ v^2. The remaining theoretical uncertainty and the impact on the measurement of the W mass is discussed. |
1103.3461 | Alexei Smirnov Yu | Alexei Yu Smirnov | Discrete symmetries and models of flavor mixing | 14 pages, 5 figures. Talk given at the Symposium "DISCRETE 2010", 6 -
11 December 2010, La Sapienza, Rome, Italy | null | 10.1088/1742-6596/335/1/012006 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Evidences of a discrete symmetry behind the pattern of lepton mixing are
analyzed. The program of "symmetry building" is outlined. Generic features and
problems of realization of this program in consistent gauge models are
formulated. The key issues include the flavor symmetry breaking, connection of
mixing and masses, {\it ad hoc} prescription of flavor charges, "missing"
representations, existence of new particles, possible accidental character of
the TBM mixing. Various ways are considered to extend the leptonic symmetries
to the quark sector and to reconcile them with Grand Unification. In this
connection the quark-lepton complementarity could be a viable alternative to
TBM. Observational consequences of the symmetries and future experimental tests
of their existence are discussed.
| [
{
"created": "Thu, 17 Mar 2011 17:07:13 GMT",
"version": "v1"
}
] | 2015-05-27 | [
[
"Smirnov",
"Alexei Yu",
""
]
] | Evidences of a discrete symmetry behind the pattern of lepton mixing are analyzed. The program of "symmetry building" is outlined. Generic features and problems of realization of this program in consistent gauge models are formulated. The key issues include the flavor symmetry breaking, connection of mixing and masses, {\it ad hoc} prescription of flavor charges, "missing" representations, existence of new particles, possible accidental character of the TBM mixing. Various ways are considered to extend the leptonic symmetries to the quark sector and to reconcile them with Grand Unification. In this connection the quark-lepton complementarity could be a viable alternative to TBM. Observational consequences of the symmetries and future experimental tests of their existence are discussed. |
hep-ph/0301181 | Zurab Silagadze | E.A. Kuraev, Z.K. Silagadze | Vacuum engineering at a photon collider? | 58 pages, LaTeX | Acta Phys.Polon. B34 (2003) 4019-4072 | null | null | hep-ph | null | The aim of this paper is twofold: to provide a rather detailed and
self-contained introduction into the physics of the Disoriented Chiral
Condensate (DCC) for the photon (and linear) collider community, and to
indicate that such physics can be searched and studied at photon colliders.
Some side tracks are also occasionally followed during the exposition, if they
lead to interesting vistas. For gourmets, the Baked Alaska recipe is given in
the appendix.
| [
{
"created": "Tue, 21 Jan 2003 18:59:23 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kuraev",
"E. A.",
""
],
[
"Silagadze",
"Z. K.",
""
]
] | The aim of this paper is twofold: to provide a rather detailed and self-contained introduction into the physics of the Disoriented Chiral Condensate (DCC) for the photon (and linear) collider community, and to indicate that such physics can be searched and studied at photon colliders. Some side tracks are also occasionally followed during the exposition, if they lead to interesting vistas. For gourmets, the Baked Alaska recipe is given in the appendix. |
2206.03909 | Cesare Cazzaniga | Cesare Cazzaniga and Annapaola de Cosa | Leptons lurking in semi-visible jets at the LHC | 8 pages , 3 figures and 1 table | Eur. Phys. J. C 82, 793 (2022) | 10.1140/epjc/s10052-022-10775-2 | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | This Letter proposes a new search for confining dark sectors at the Large
Hadron Collider. As a result of the strong dynamics in the hidden sector, dark
matter could manifest in proton-proton collisions at the Large Hadron Collider
in form of hadronic jets containing stable invisible bound states. These
semi-visible jets have been studied theoretically and experimentally in the
fully hadronic signature where the unstable composite dark matter can only
decay promptly back to Standard Model quarks. We present a simplified model
based on two messenger fields separated by a large mass gap allowing dark bound
states to decay into pairs of oppositely charged leptons. The resulting
experimental signature is characterized by non-isolated lepton pairs inside
semi-visible jets. We propose a search strategy independent from the underlying
model assumptions targeting this new signature, and discuss the orthogonality
with respect to the existing searches. Remaining agnostic on the shape of the
di-lepton spectrum, we determine the sensitivity of a dedicated analysis to the
target signal. The proposed search can claim the 3{\sigma} evidence (exclusion)
of the heavier mediator up to masses of 3.5 TeV (4.5 TeV) with the full Run 2
data of the LHC. Exploiting the resonant feature of the lepton pairs can
enhance the sensitivity reach on a specific model. We estimate that an analysis
using the di-lepton invariant mass information can reach 5{\sigma} discovery up
to masses of 3.5 TeV and improve the exclusion up to more than 5 TeV.
| [
{
"created": "Wed, 8 Jun 2022 14:02:45 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Jun 2022 20:41:50 GMT",
"version": "v2"
},
{
"created": "Tue, 6 Sep 2022 10:32:49 GMT",
"version": "v3"
}
] | 2022-09-07 | [
[
"Cazzaniga",
"Cesare",
""
],
[
"de Cosa",
"Annapaola",
""
]
] | This Letter proposes a new search for confining dark sectors at the Large Hadron Collider. As a result of the strong dynamics in the hidden sector, dark matter could manifest in proton-proton collisions at the Large Hadron Collider in form of hadronic jets containing stable invisible bound states. These semi-visible jets have been studied theoretically and experimentally in the fully hadronic signature where the unstable composite dark matter can only decay promptly back to Standard Model quarks. We present a simplified model based on two messenger fields separated by a large mass gap allowing dark bound states to decay into pairs of oppositely charged leptons. The resulting experimental signature is characterized by non-isolated lepton pairs inside semi-visible jets. We propose a search strategy independent from the underlying model assumptions targeting this new signature, and discuss the orthogonality with respect to the existing searches. Remaining agnostic on the shape of the di-lepton spectrum, we determine the sensitivity of a dedicated analysis to the target signal. The proposed search can claim the 3{\sigma} evidence (exclusion) of the heavier mediator up to masses of 3.5 TeV (4.5 TeV) with the full Run 2 data of the LHC. Exploiting the resonant feature of the lepton pairs can enhance the sensitivity reach on a specific model. We estimate that an analysis using the di-lepton invariant mass information can reach 5{\sigma} discovery up to masses of 3.5 TeV and improve the exclusion up to more than 5 TeV. |
1009.5239 | Jan Steinheimer | J. Steinheimer, S. Schramm and H. St\"ocker | An effective chiral Hadron-Quark Equation of State | 19 pages, 13 figures Version accepted by J. Phys. G | J.Phys.G38:035001,2011 | 10.1088/0954-3899/38/3/035001 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct an effective model for the QCD equation of state, taking into
account chiral symmetry restoration as well as the deconfinement phase
transition. The correct asymptotic degrees of freedom at the high and low
temperature limits are included (quarks $\leftrightarrow$ hadrons). The model
shows a rapid crossover for both order parameters, as is expected from lattice
calculations. We then compare the thermodynamic properties of the model at
$\mu_B=0$ which turn out to be in qualitative agreement with lattice data,
while apparent quantitative differences can be attributed to hadronic
contributions and excluded volume corrections. Furthermore we discuss the
effects of a repulsive vector type quark interaction at finite baryon number
densities on the resulting phase diagram of the model. Our current model is
able to reproduce a first-order liquid gas phase transition as expected, but
does not show any signs of a first order deconfinement or chiral phase
transition. Both transitions rather appear as a very wide crossover in which
heavily medium modified hadron coexist with free quarks.
| [
{
"created": "Mon, 27 Sep 2010 12:26:56 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Jan 2011 11:38:52 GMT",
"version": "v2"
}
] | 2011-01-28 | [
[
"Steinheimer",
"J.",
""
],
[
"Schramm",
"S.",
""
],
[
"Stöcker",
"H.",
""
]
] | We construct an effective model for the QCD equation of state, taking into account chiral symmetry restoration as well as the deconfinement phase transition. The correct asymptotic degrees of freedom at the high and low temperature limits are included (quarks $\leftrightarrow$ hadrons). The model shows a rapid crossover for both order parameters, as is expected from lattice calculations. We then compare the thermodynamic properties of the model at $\mu_B=0$ which turn out to be in qualitative agreement with lattice data, while apparent quantitative differences can be attributed to hadronic contributions and excluded volume corrections. Furthermore we discuss the effects of a repulsive vector type quark interaction at finite baryon number densities on the resulting phase diagram of the model. Our current model is able to reproduce a first-order liquid gas phase transition as expected, but does not show any signs of a first order deconfinement or chiral phase transition. Both transitions rather appear as a very wide crossover in which heavily medium modified hadron coexist with free quarks. |
hep-ph/0110382 | Yosuke Uehara | Yosuke Uehara | Production and Detection of Black Holes at Neutrino Array | 5 pages, 2 figures, errors corrected | Prog.Theor.Phys. 107 (2002) 621-624 | 10.1143/PTP.107.621 | UT-973 | hep-ph astro-ph | null | We consider the production of black holes caused by the collision between
high-energy cosmic neutrinos and nuclei contained in detectors. If the
fundamental scale M_{*} is O(TEV), as some higher-dimensional theories suggest,
ICECUBE detector may observe about 10^{4} - 10^{2} black holes per year.
| [
{
"created": "Tue, 30 Oct 2001 03:59:32 GMT",
"version": "v1"
},
{
"created": "Sat, 10 Nov 2001 02:18:35 GMT",
"version": "v2"
},
{
"created": "Wed, 5 Dec 2001 11:01:08 GMT",
"version": "v3"
},
{
"created": "Sun, 9 Dec 2001 13:00:47 GMT",
"version": "v4"
},
{
"created": "Mon, 17 Dec 2001 14:33:22 GMT",
"version": "v5"
}
] | 2009-11-07 | [
[
"Uehara",
"Yosuke",
""
]
] | We consider the production of black holes caused by the collision between high-energy cosmic neutrinos and nuclei contained in detectors. If the fundamental scale M_{*} is O(TEV), as some higher-dimensional theories suggest, ICECUBE detector may observe about 10^{4} - 10^{2} black holes per year. |
2104.03701 | Tanmoy Mondal | Eung Jin Chun and Tanmoy Mondal | Leptophilic bosons and muon g-2 at lepton colliders | v2: Published in JHEP. 11 pages, 5 figures | JHEP07(2021)044 | 10.1007/JHEP07(2021)044 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A light leptophilic boson (scalar or pseudoscalar) has been postulated to
explain the muon g-2 anomaly and could be a portal to dark matter. Realizing
the leptophilic nature of a singlet boson in the framework of the
two-Higgs-doublet-Model of type-X, we identify the parameter space viable for
the explanation of the updated muon g-2 discrepancy. It is then shown that such
a hypothetical particle will be unambiguously ruled out or discovered via the
Yukawa process at a lepton collider designed as a Higgs factory.
| [
{
"created": "Thu, 8 Apr 2021 11:49:10 GMT",
"version": "v1"
},
{
"created": "Sat, 10 Jul 2021 09:44:20 GMT",
"version": "v2"
}
] | 2021-07-13 | [
[
"Chun",
"Eung Jin",
""
],
[
"Mondal",
"Tanmoy",
""
]
] | A light leptophilic boson (scalar or pseudoscalar) has been postulated to explain the muon g-2 anomaly and could be a portal to dark matter. Realizing the leptophilic nature of a singlet boson in the framework of the two-Higgs-doublet-Model of type-X, we identify the parameter space viable for the explanation of the updated muon g-2 discrepancy. It is then shown that such a hypothetical particle will be unambiguously ruled out or discovered via the Yukawa process at a lepton collider designed as a Higgs factory. |
1203.4467 | Eugene Levin | Eugene Levin (Tel Aviv Un./UTSFT) | Nuclear modification factor for gluon jets | 6 pp. and 8 figures in .eps files | null | 10.1063/1.4802182 | TAUP 2146/12 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown that the nuclear modification factor can be smaller that unity
for jet production at small $x$ and at large transverse momentum without any
violation of the factorization theorem and the initial state effects is able to
explain the nuclear modification factor of the order of the one measured by
ATLAS. In other word, initial state effects are able to describe the jet
quenching for the gluon jet production.
| [
{
"created": "Tue, 20 Mar 2012 15:23:24 GMT",
"version": "v1"
},
{
"created": "Sat, 26 May 2012 12:11:40 GMT",
"version": "v2"
}
] | 2015-06-04 | [
[
"Levin",
"Eugene",
"",
"Tel Aviv Un./UTSFT"
]
] | It is shown that the nuclear modification factor can be smaller that unity for jet production at small $x$ and at large transverse momentum without any violation of the factorization theorem and the initial state effects is able to explain the nuclear modification factor of the order of the one measured by ATLAS. In other word, initial state effects are able to describe the jet quenching for the gluon jet production. |
1704.02940 | Gholamhossein Haghighat | Majid Hashemi and Gholamhossein Haghighat (Physics Department, College
of Sciences, Shiraz University, Shiraz, Iran) | Search for heavy neutral CP-even Higgs within Type-IV 2HDM at a future
linear collider | 23 pages, 18 figures, 10 tables | Phys.Lett. B772 (2017) 426-434 | 10.1016/j.physletb.2017.06.068 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, the production process $e^- e^+ \rightarrow A H$ is analyzed
in the context of the type IV 2HDM and the question of observability of a
neutral CP-even Higgs boson $H$ at a linear collider operating at $\sqrt{s}=1$
TeV is addressed. The CP-odd Higgs is assumed to experience a gauge-Higgs decay
as $A\rightarrow ZH$ with hadronic decay of $Z$ boson as the signature of
signal events. The production chain is thus $e^+e^- \rightarrow AH \rightarrow
ZHH \rightarrow jj\ell\ell\ell\ell$ where $\ell$ is a $\tau$ or $\mu$. Four
benchmark points with different mass hypotheses are assumed for the analysis.
The Higgs mass $m_H$ is assumed to vary within the range 150-300 GeV in
increments of 50 GeV. The anti-$k_t$ algorithm is used to perform the jet
reconstruction. Results indicate that the neutral CP-even Higgs $H$ is
observable through this production mechanism using the di-muon invariant mass
distribution with possibility of mass measurement. The corresponding signal
significances exceed $5\sigma$ at integrated luminosity of 3000 $fb^{-1}$.
| [
{
"created": "Mon, 10 Apr 2017 16:34:33 GMT",
"version": "v1"
}
] | 2017-09-27 | [
[
"Hashemi",
"Majid",
"",
"Physics Department, College\n of Sciences, Shiraz University, Shiraz, Iran"
],
[
"Haghighat",
"Gholamhossein",
"",
"Physics Department, College\n of Sciences, Shiraz University, Shiraz, Iran"
]
] | In this paper, the production process $e^- e^+ \rightarrow A H$ is analyzed in the context of the type IV 2HDM and the question of observability of a neutral CP-even Higgs boson $H$ at a linear collider operating at $\sqrt{s}=1$ TeV is addressed. The CP-odd Higgs is assumed to experience a gauge-Higgs decay as $A\rightarrow ZH$ with hadronic decay of $Z$ boson as the signature of signal events. The production chain is thus $e^+e^- \rightarrow AH \rightarrow ZHH \rightarrow jj\ell\ell\ell\ell$ where $\ell$ is a $\tau$ or $\mu$. Four benchmark points with different mass hypotheses are assumed for the analysis. The Higgs mass $m_H$ is assumed to vary within the range 150-300 GeV in increments of 50 GeV. The anti-$k_t$ algorithm is used to perform the jet reconstruction. Results indicate that the neutral CP-even Higgs $H$ is observable through this production mechanism using the di-muon invariant mass distribution with possibility of mass measurement. The corresponding signal significances exceed $5\sigma$ at integrated luminosity of 3000 $fb^{-1}$. |
hep-ph/9908357 | Chris Quigg | Chris Quigg | Questions of Identity | Introduction to NuFact '99, the ICFA/ECFA Workshop on Neutrino
Factories Based on Muon Storage Rings. 15 pages; LaTeX, uses elsart | Nucl.Instrum.Meth.A451:1-9,2000 | 10.1016/S0168-9002(00)00366-1 | FERMILAB-CONF-99/233-T | hep-ph | null | As an introduction to NuFact '99, the ICFA/ECFA Workshop on Neutrino
Factories Based on Muon Storage Rings, I place the issues of neutrino
properties and neutrino oscillations in the broader context of fermion flavor.
| [
{
"created": "Fri, 13 Aug 1999 20:27:22 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Quigg",
"Chris",
""
]
] | As an introduction to NuFact '99, the ICFA/ECFA Workshop on Neutrino Factories Based on Muon Storage Rings, I place the issues of neutrino properties and neutrino oscillations in the broader context of fermion flavor. |
hep-ph/9911338 | Cheng-Wei Chiang | Cheng-Wei Chiang and Lincoln Wolfenstein | Observables in the Decays of B to Two Vector Mesons | 12 pages, no figure | Phys.Rev. D61 (2000) 074031 | 10.1103/PhysRevD.61.074031 | null | hep-ph | null | In general there are nine observables in the decay of a B meson to two vector
mesons defined in terms of polarization correlations of these mesons. Only six
of these can be detected via the subsequent decay angular distributions because
of parity conservation in those decays. The remaining three require the
measurement of the spin polarization of one of the decay products.
| [
{
"created": "Fri, 12 Nov 1999 18:42:41 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Chiang",
"Cheng-Wei",
""
],
[
"Wolfenstein",
"Lincoln",
""
]
] | In general there are nine observables in the decay of a B meson to two vector mesons defined in terms of polarization correlations of these mesons. Only six of these can be detected via the subsequent decay angular distributions because of parity conservation in those decays. The remaining three require the measurement of the spin polarization of one of the decay products. |
hep-ph/0408278 | S. Weinzierl | Stefan Weinzierl | Status of NNLO 3-jet calculations | 5 pages, talk given at the International Conference on Linear
Colliders, Paris, 2004 | null | null | null | hep-ph | null | The process e+ e- -> 3 jets offers the opportunity to measure the strong
coupling constant. For an accurate determination, precise theoretical
calculations are necessary. I will give an overview on the status of the
next-to-next-to-leading order calculations.
| [
{
"created": "Wed, 25 Aug 2004 11:55:23 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Weinzierl",
"Stefan",
""
]
] | The process e+ e- -> 3 jets offers the opportunity to measure the strong coupling constant. For an accurate determination, precise theoretical calculations are necessary. I will give an overview on the status of the next-to-next-to-leading order calculations. |
hep-ph/9810352 | Alan Kostelecky | Alan Kostelecky | Testing CPT and Lorentz Symmetry with Neutral-Meson Oscillations and QED
Experiments | 8 pages, talk presented at the Workshop on CP Violation, Adelaide,
Australia, July 1998 | null | null | IUHET 396, September 1998 | hep-ph | null | This talk summarizes some theoretical features and experimental implications
of a general Lorentz-violating extension of the minimal SU(3) x SU(2) x U(1)
standard model that allows for both CPT-even and CPT-odd effects. The theory
would arise as the low-energy limit of a fundamental theory that is Lorentz and
CPT covariant but in which spontaneous Lorentz breaking occurs. The use of
neutral-meson oscillations and various QED systems to bound the apparent CPT
and Lorentz violations is described.
| [
{
"created": "Tue, 13 Oct 1998 22:08:37 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kostelecky",
"Alan",
""
]
] | This talk summarizes some theoretical features and experimental implications of a general Lorentz-violating extension of the minimal SU(3) x SU(2) x U(1) standard model that allows for both CPT-even and CPT-odd effects. The theory would arise as the low-energy limit of a fundamental theory that is Lorentz and CPT covariant but in which spontaneous Lorentz breaking occurs. The use of neutral-meson oscillations and various QED systems to bound the apparent CPT and Lorentz violations is described. |
1812.01030 | Gorazd Cvetic | Cesar Ayala, Gorazd Cvetic, Anatoly V. Kotikov, and Binur G.
Shaikhatdenov | Bjorken polarized sum rule and infrared-safe QCD couplings | 29 pages, 8 figures; to appear in EPJ C | Eur. Phys. J. C (2018) 78:1002 (25 pp.) | 10.1140/epjc/s10052-018-6490-9 | USM-TH-357 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Experimental data obtained for the polarized Bjorken sum rule (BSR)
$\Gamma_1^{p-n}(Q^2)$ are fitted by using predictions derived within a
truncated operator product expansion (OPE) approach to QCD. Four QCD versions
are considered: perturbative QCD (pQCD) in the MSbar scheme, Analytic
Perturbation Theory (APT), and 2$\delta$ and 3$\delta$ analytic QCD versions.
In contrast to pQCD, these QCD variants do not have Landau singularities at low
positive $Q^2$, which facilitates the fitting procedure significantly. The
fitting procedure is applied first to the experimental data of the inelastic
part of BSR, and the known elastic contributions are added after the fitting.
In general, when 2$\delta$ and 3$\delta$ QCD coupling is used the fitted curves
give the best results, within the $Q^2$-range of the fit as well as in extended
$Q^2$-intervals. When the fitting procedure is applied to the total BSR, i.e.,
to the sum of the experimental data and the elastic contribution, the quality
of the results deteriorates significantly.
| [
{
"created": "Mon, 3 Dec 2018 19:06:08 GMT",
"version": "v1"
}
] | 2018-12-12 | [
[
"Ayala",
"Cesar",
""
],
[
"Cvetic",
"Gorazd",
""
],
[
"Kotikov",
"Anatoly V.",
""
],
[
"Shaikhatdenov",
"Binur G.",
""
]
] | Experimental data obtained for the polarized Bjorken sum rule (BSR) $\Gamma_1^{p-n}(Q^2)$ are fitted by using predictions derived within a truncated operator product expansion (OPE) approach to QCD. Four QCD versions are considered: perturbative QCD (pQCD) in the MSbar scheme, Analytic Perturbation Theory (APT), and 2$\delta$ and 3$\delta$ analytic QCD versions. In contrast to pQCD, these QCD variants do not have Landau singularities at low positive $Q^2$, which facilitates the fitting procedure significantly. The fitting procedure is applied first to the experimental data of the inelastic part of BSR, and the known elastic contributions are added after the fitting. In general, when 2$\delta$ and 3$\delta$ QCD coupling is used the fitted curves give the best results, within the $Q^2$-range of the fit as well as in extended $Q^2$-intervals. When the fitting procedure is applied to the total BSR, i.e., to the sum of the experimental data and the elastic contribution, the quality of the results deteriorates significantly. |
1412.5952 | Giovanni Grilli di Cortona | Giovanni Grilli di Cortona | Hunting electroweakinos at future hadron colliders and direct detection
experiments | 25 pages, matches version accepted by JHEP | null | 10.1007/JHEP05(2015)035 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyse the mass reach for electroweakinos at future hadron colliders and
their interplay with direct detection experiments. Motivated by the LHC data,
we focus on split supersymmetry models with different electroweakino spectra.
We find for example that a 100 TeV collider may explore Winos up to ~ 7 TeV in
low scale gauge mediation models or thermal Wino dark matter around 3 TeV in
models of anomaly mediation with long-lived Winos. We show moreover how
collider searches and direct detection experiments have the potential to cover
large part of the parameter space even in scenarios where the lightest
neutralino does not contribute to the whole dark matter relic density.
| [
{
"created": "Thu, 18 Dec 2014 17:20:00 GMT",
"version": "v1"
},
{
"created": "Wed, 6 May 2015 07:43:04 GMT",
"version": "v2"
}
] | 2015-05-12 | [
[
"di Cortona",
"Giovanni Grilli",
""
]
] | We analyse the mass reach for electroweakinos at future hadron colliders and their interplay with direct detection experiments. Motivated by the LHC data, we focus on split supersymmetry models with different electroweakino spectra. We find for example that a 100 TeV collider may explore Winos up to ~ 7 TeV in low scale gauge mediation models or thermal Wino dark matter around 3 TeV in models of anomaly mediation with long-lived Winos. We show moreover how collider searches and direct detection experiments have the potential to cover large part of the parameter space even in scenarios where the lightest neutralino does not contribute to the whole dark matter relic density. |
0904.0957 | Vincenzo Cirigliano | Vincenzo Cirigliano, Ryuichiro Kitano, Yasuhiro Okada, Paula Tuzon | On the model discriminating power of mu -> e conversion in nuclei | 23 pages, 12 figures, 1 table | Phys.Rev.D80:013002,2009 | 10.1103/PhysRevD.80.013002 | IFIC-09-14, FTUV-09-0402, KEK-TH-1308, LA-UR-09-01473, TU-845 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We assess the model discriminating power of a combined phenomenological
analysis of mu -> e gamma and mu -> e conversion on different target nuclei,
including the current hadronic uncertainties. We find that the theoretical
uncertainties can be largely reduced by using input from lattice QCD and do not
constitute a limiting factor in discriminating models where one or at most two
underlying operators (dipole, scalar, vector) provide the dominant source of
lepton flavor violation. Our results show that a realistic discrimination among
underlying mechanisms requires a measurement of the ratio of conversion rates
at the 5% level (two light nuclei) or at the 20% level (one light and one heavy
nucleus). We have illustrated these main conclusions also in the context of a
supersymmetric model.
| [
{
"created": "Mon, 6 Apr 2009 15:51:29 GMT",
"version": "v1"
}
] | 2010-05-27 | [
[
"Cirigliano",
"Vincenzo",
""
],
[
"Kitano",
"Ryuichiro",
""
],
[
"Okada",
"Yasuhiro",
""
],
[
"Tuzon",
"Paula",
""
]
] | We assess the model discriminating power of a combined phenomenological analysis of mu -> e gamma and mu -> e conversion on different target nuclei, including the current hadronic uncertainties. We find that the theoretical uncertainties can be largely reduced by using input from lattice QCD and do not constitute a limiting factor in discriminating models where one or at most two underlying operators (dipole, scalar, vector) provide the dominant source of lepton flavor violation. Our results show that a realistic discrimination among underlying mechanisms requires a measurement of the ratio of conversion rates at the 5% level (two light nuclei) or at the 20% level (one light and one heavy nucleus). We have illustrated these main conclusions also in the context of a supersymmetric model. |
hep-ph/0309331 | Jeppe R. Andersen | Jeppe R. Andersen (1,2), Agustin Sabio Vera (1) ((1) Cavendish
Laboratory, U. of Cambridge, (2) DAMTP, U. of Cambridge) | The Gluon Green's Function in the BFKL Approach at Next-to-Leading
Logarithmic Accuracy | 18 pages, 16 figures. v2: Discussion extended, one figure added.
Accepted for publication in Nucl. Phys. B | Nucl.Phys.B679:345-362,2004 | 10.1016/j.nuclphysb.2003.11.034 | Cavendish-HEP-2003/24, DAMTP-2003-94 | hep-ph | null | We investigate the gluon Green's function in the high energy limit of QCD
using a recently proposed iterative solution of the
Balitsky-Fadin-Kuraev-Lipatov (BFKL) equation at next-to-leading logarithmic
(NLL) accuracy. To establish the applicability of this method in the NLL
approximation we solve the BFKL equation as originally written by Fadin and
Lipatov, and compare the results with previous studies in the leading
logarithmic (LL) approximation.
| [
{
"created": "Mon, 29 Sep 2003 19:52:24 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Nov 2003 17:08:53 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Andersen",
"Jeppe R.",
""
],
[
"Vera",
"Agustin Sabio",
""
]
] | We investigate the gluon Green's function in the high energy limit of QCD using a recently proposed iterative solution of the Balitsky-Fadin-Kuraev-Lipatov (BFKL) equation at next-to-leading logarithmic (NLL) accuracy. To establish the applicability of this method in the NLL approximation we solve the BFKL equation as originally written by Fadin and Lipatov, and compare the results with previous studies in the leading logarithmic (LL) approximation. |
hep-ph/0012267 | Dr. Dubravko Klabucar | Dubravko Klabucar (Zagreb University), Dalibor Kekez (Institute Rudjer
Boskovic), Michael D. Scadron (University of Arizona) | On the eta-eta' complex in the SD-BS approach | 11 pages, 1 figure, revtex. Invited talk presented by D. Klabucar at
the workshop "Quark Matter in Astro- and Particle Physics" (27.-29. November
2000, Rostock, Germany), to appear in the proceedings of this workshop | null | null | ZTF-00/06 | hep-ph nucl-th | null | The bound-state Schwinger-Dyson and Bethe-Salpeter (SD-BS) approach is
chirally well-behaved and provides a reliable treatment of the eta-eta' complex
although a ladder approximation is employed. Allowing for the effects of the
SU(3) flavor symmetry breaking in the quark-antiquark annihilation, leads to
the improved eta-eta' mass matrix.
| [
{
"created": "Wed, 20 Dec 2000 14:50:47 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Klabucar",
"Dubravko",
"",
"Zagreb University"
],
[
"Kekez",
"Dalibor",
"",
"Institute Rudjer\n Boskovic"
],
[
"Scadron",
"Michael D.",
"",
"University of Arizona"
]
] | The bound-state Schwinger-Dyson and Bethe-Salpeter (SD-BS) approach is chirally well-behaved and provides a reliable treatment of the eta-eta' complex although a ladder approximation is employed. Allowing for the effects of the SU(3) flavor symmetry breaking in the quark-antiquark annihilation, leads to the improved eta-eta' mass matrix. |
hep-ph/9505419 | Matteo Cacciari | Matteo Cacciari and Mario Greco | Charm Production via Fragmentation | 10 pages, LaTeX, 7 embedded figures missing. Complete postscript
version available in http://cobra4.pv.infn.it:8080/papers/ | Z.Phys.C69:459-466,1996 | 10.1007/s002880050047 | DESY 95-103, FNT/T-95/12, LNF-95/025(P) | hep-ph | null | The next-to-leading open charm production in $\gamma p$ collisions is
calculated within the Perturbative Fragmentation Functions formalism, to allow
resummation of $\as\log(\pt^2/m^2)$ terms. In the large $\pt$ region $(\pt >
m)$ the result is consistent with the fixed order NLO calculation, small
discrepancies being found for very large $\pt$ and at the edge of phase space.
The two approaches differ in the definition and the relative contribution of
the direct and resolved terms, but essentially agree on their sum. The
resummation is found to lead to a reduced sensitivity to the choice of the
renormalization/factorization scale.
| [
{
"created": "Tue, 30 May 1995 14:12:35 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Cacciari",
"Matteo",
""
],
[
"Greco",
"Mario",
""
]
] | The next-to-leading open charm production in $\gamma p$ collisions is calculated within the Perturbative Fragmentation Functions formalism, to allow resummation of $\as\log(\pt^2/m^2)$ terms. In the large $\pt$ region $(\pt > m)$ the result is consistent with the fixed order NLO calculation, small discrepancies being found for very large $\pt$ and at the edge of phase space. The two approaches differ in the definition and the relative contribution of the direct and resolved terms, but essentially agree on their sum. The resummation is found to lead to a reduced sensitivity to the choice of the renormalization/factorization scale. |
1111.2361 | Matthew McCullough | Rhys Davies and Matthew McCullough | Small neutrino masses due to R-symmetry breaking for a small
cosmological constant | 6 pages, 2 figures. v2 matches published version | Phys. Rev. D 86, 025014 (2012) | 10.1103/PhysRevD.86.025014 | MIT-CTP 4325 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe a class of supersymmetric models in which neutrinos are kept
light by an R-symmetry. In supergravity, R-symmetry must be broken to allow for
a small cosmological constant after supersymmetry breaking. In the class of
models described here, this R-symmetry breaking results in the generation of
Dirac neutrino masses, connecting the tuning of the cosmological constant to
the puzzle of neutrino masses. Surprisingly, under the assumption of low-scale
supersymmetry breaking and superpartner masses close to a TeV, these masses are
independent of the fundamental supersymmetry-breaking scale, and accommodate
the correct magnitude. This offers a novel explanation for the vastly different
scales of neutrino and charged fermion masses. These models require that
R-symmetric supersymmetry exists at the TeV scale, and predict that neutrino
masses are purely Dirac, implying the absence of neutrino-less double
beta-decay. Interesting collider signals can arise due to charged scalars which
decay leptonically, with branching ratios determined by the neutrino mixing
matrix.
| [
{
"created": "Wed, 9 Nov 2011 22:53:08 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Aug 2012 19:59:04 GMT",
"version": "v2"
}
] | 2013-05-30 | [
[
"Davies",
"Rhys",
""
],
[
"McCullough",
"Matthew",
""
]
] | We describe a class of supersymmetric models in which neutrinos are kept light by an R-symmetry. In supergravity, R-symmetry must be broken to allow for a small cosmological constant after supersymmetry breaking. In the class of models described here, this R-symmetry breaking results in the generation of Dirac neutrino masses, connecting the tuning of the cosmological constant to the puzzle of neutrino masses. Surprisingly, under the assumption of low-scale supersymmetry breaking and superpartner masses close to a TeV, these masses are independent of the fundamental supersymmetry-breaking scale, and accommodate the correct magnitude. This offers a novel explanation for the vastly different scales of neutrino and charged fermion masses. These models require that R-symmetric supersymmetry exists at the TeV scale, and predict that neutrino masses are purely Dirac, implying the absence of neutrino-less double beta-decay. Interesting collider signals can arise due to charged scalars which decay leptonically, with branching ratios determined by the neutrino mixing matrix. |
hep-ph/0311331 | Bo-Qiang Ma | Bin Wu and Bo-Qiang Ma | Parity of Anti-Decuplet Baryons Revisited from Chiral Soliton Models | 4 pages in revtex format, version for journal publication. Arguments
revised, with conclusion unchanged | Phys.Rev.D70:097503,2004 | 10.1103/PhysRevD.70.097503 | null | hep-ph hep-ex nucl-ex nucl-th | null | We recalculate masses and widths of anti-decuplet baryons in the case of
positive parity from chiral soliton models, provided that the member
$\Xi_{3/2}$ of the anti-decuplet has a mass 1.86 GeV as reported recently.
Calculations show that there are no convincing candidates for the nonexotic
members of the anti-decuplet available in the baryon listings. Up to the
leading order of $m_s$ and 1/$N_c$, the width formula for the decay of the
anti-decuplet baryons to the octet depends only on SU(3) symmetry
model-independently, except the coupling constant. Similarly we give a width
formula for the decay of negative parity baryons belong to certain SU(3) baryon
multiplet by pure symmetry consideration. By this formula, we find that if we
have an anti-decuplet with negative parity and that the masses are the same as
those given by chiral soltion models, the identification of N(1650) as
$N_{\bar{10}}$ are inconsistent with experiments for $N(1650)\to N\pi$ while
the widths agree with other two decay channels involving strangeness. And
$\Sigma(1750)$ seems to be a reasonable candidate for $\Sigma_{\bar{10}}$.
| [
{
"created": "Tue, 25 Nov 2003 23:44:07 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Jul 2004 23:30:06 GMT",
"version": "v2"
}
] | 2011-07-19 | [
[
"Wu",
"Bin",
""
],
[
"Ma",
"Bo-Qiang",
""
]
] | We recalculate masses and widths of anti-decuplet baryons in the case of positive parity from chiral soliton models, provided that the member $\Xi_{3/2}$ of the anti-decuplet has a mass 1.86 GeV as reported recently. Calculations show that there are no convincing candidates for the nonexotic members of the anti-decuplet available in the baryon listings. Up to the leading order of $m_s$ and 1/$N_c$, the width formula for the decay of the anti-decuplet baryons to the octet depends only on SU(3) symmetry model-independently, except the coupling constant. Similarly we give a width formula for the decay of negative parity baryons belong to certain SU(3) baryon multiplet by pure symmetry consideration. By this formula, we find that if we have an anti-decuplet with negative parity and that the masses are the same as those given by chiral soltion models, the identification of N(1650) as $N_{\bar{10}}$ are inconsistent with experiments for $N(1650)\to N\pi$ while the widths agree with other two decay channels involving strangeness. And $\Sigma(1750)$ seems to be a reasonable candidate for $\Sigma_{\bar{10}}$. |
hep-ph/9802217 | T. E. Browder | T.E. Browder (University of Hawaii) | Hadronic B Decays | 12 pages, 2 figures, LATEX with sprocl.sty | null | null | UH 511-890-97 | hep-ph hep-ex | null | We review recent experimental results from CLEO and LEP experiments on
hadronic decays of hadrons containing $b$ quarks. We discuss charm counting and
the semileptonic branching fraction in $B$ decays and the color suppressed
amplitude in $B$ decay. (to appear in the Proceedings of 1997 Heavy Flavors
Conference in Santa Barbara)
| [
{
"created": "Mon, 2 Feb 1998 22:07:27 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Browder",
"T. E.",
"",
"University of Hawaii"
]
] | We review recent experimental results from CLEO and LEP experiments on hadronic decays of hadrons containing $b$ quarks. We discuss charm counting and the semileptonic branching fraction in $B$ decays and the color suppressed amplitude in $B$ decay. (to appear in the Proceedings of 1997 Heavy Flavors Conference in Santa Barbara) |
1605.01134 | Yanrui Liu | Jing Wu, Yan-Rui Liu, Kan Chen, Xiang Liu, Shi-Lin Zhu | Heavy-flavored tetraquark states with the $QQ\bar{Q}\bar{Q}$
configuration | 14 pages, 6 tables, 1 figure, version accepted by PRD | Phys. Rev. D 97, 094015 (2018) | 10.1103/PhysRevD.97.094015 | null | hep-ph hep-ex hep-lat nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the framework of the color-magnetic interaction, we systematically
investigate the mass spectrum of the tetraquark states composed of four heavy
quarks with the $QQ\bar Q\bar Q$ configuration in this work. We also show their
strong decay patterns. Stable or narrow states in the $bb\bar{b}\bar{c}$ and
$bc\bar{b}\bar{c}$ systems are found to be possible. We hope the studies shall
be helpful to the experimental search for heavy-full exotic tetraquark states.
| [
{
"created": "Wed, 4 May 2016 03:41:55 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Apr 2018 13:38:06 GMT",
"version": "v2"
}
] | 2018-05-18 | [
[
"Wu",
"Jing",
""
],
[
"Liu",
"Yan-Rui",
""
],
[
"Chen",
"Kan",
""
],
[
"Liu",
"Xiang",
""
],
[
"Zhu",
"Shi-Lin",
""
]
] | In the framework of the color-magnetic interaction, we systematically investigate the mass spectrum of the tetraquark states composed of four heavy quarks with the $QQ\bar Q\bar Q$ configuration in this work. We also show their strong decay patterns. Stable or narrow states in the $bb\bar{b}\bar{c}$ and $bc\bar{b}\bar{c}$ systems are found to be possible. We hope the studies shall be helpful to the experimental search for heavy-full exotic tetraquark states. |
0802.0049 | Ben O'Leary | M. Giffels, J. Kallarackal, M. Kramer, B. O'Leary, and A. Stahl | The lepton-flavour violating decay \tau \to \mu \mu \antimu at the LHC | 19 pages, 9 figures, this version: some clarifications, typos
corrected, references added | Phys.Rev.D77:073010,2008 | 10.1103/PhysRevD.77.073010 | PITHA 08/04 | hep-ph | null | Lepton-flavour violating tau-decays are predicted in many extensions of the
Standard Model at a rate observable at future collider experiments. In this
article we focus on the decay tau to mu mu antimu, which is a promising channel
to observe lepton-flavour violation at the Large Hadron Collider LHC. We
present analytic expressions for the differential decay width derived from a
model-independent effective Lagrangian with general four-fermion operators, and
estimate the experimental acceptance for detecting the decay tau to mu mu
antimu at the LHC. Specific emphasis is given to decay angular distributions
and how they can be used to discriminate new physics models. We provide
specific predictions for various extensions of the Standard Model, including
supersymmetric, little Higgs and technicolour models.
| [
{
"created": "Fri, 1 Feb 2008 15:12:29 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Mar 2008 13:36:49 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Giffels",
"M.",
""
],
[
"Kallarackal",
"J.",
""
],
[
"Kramer",
"M.",
""
],
[
"O'Leary",
"B.",
""
],
[
"Stahl",
"A.",
""
]
] | Lepton-flavour violating tau-decays are predicted in many extensions of the Standard Model at a rate observable at future collider experiments. In this article we focus on the decay tau to mu mu antimu, which is a promising channel to observe lepton-flavour violation at the Large Hadron Collider LHC. We present analytic expressions for the differential decay width derived from a model-independent effective Lagrangian with general four-fermion operators, and estimate the experimental acceptance for detecting the decay tau to mu mu antimu at the LHC. Specific emphasis is given to decay angular distributions and how they can be used to discriminate new physics models. We provide specific predictions for various extensions of the Standard Model, including supersymmetric, little Higgs and technicolour models. |
2004.09004 | Oleh Savchuk | Oleh Savchuk, Yehor Bondar, Oleksandr Stashko, Roman V. Poberezhnyuk,
Volodymyr Vovchenko, Mark I. Gorenstein, Horst Stoecker | Bose-Einstein condensation phenomenology in systems with repulsive
interactions | 10 pages, 4 figures | Phys. Rev. C 102, 035202 (2020) | 10.1103/PhysRevC.102.035202 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The role of repulsive interactions in statistical systems of Bose particles
is investigated. Three different phenomenological frameworks are considered: a
mean field model, an excluded volume model, and a model with a medium dependent
effective mass. All three models are tuned to yield similar equations of state,
with only minor deviations from the ideal Bose gas at small chemical
potentials. Our analysis indicates, however, that these models lead to
qualitatively different results for the Bose-Einstein condensation phenomenon.
We discuss the different aspects of this phenomenon, namely, an onset of the
Bose-Einstein condensation, particle number fluctuations, and a behavior of the
Bose condensate. The obtained results can be helpful for interpreting the
lattice QCD data at small temperature and large isospin chemical potential and
the data on multiple pion production in high energy nuclear collisions.
| [
{
"created": "Mon, 20 Apr 2020 00:56:56 GMT",
"version": "v1"
}
] | 2020-09-16 | [
[
"Savchuk",
"Oleh",
""
],
[
"Bondar",
"Yehor",
""
],
[
"Stashko",
"Oleksandr",
""
],
[
"Poberezhnyuk",
"Roman V.",
""
],
[
"Vovchenko",
"Volodymyr",
""
],
[
"Gorenstein",
"Mark I.",
""
],
[
"Stoecker",
"Horst",
""
]
] | The role of repulsive interactions in statistical systems of Bose particles is investigated. Three different phenomenological frameworks are considered: a mean field model, an excluded volume model, and a model with a medium dependent effective mass. All three models are tuned to yield similar equations of state, with only minor deviations from the ideal Bose gas at small chemical potentials. Our analysis indicates, however, that these models lead to qualitatively different results for the Bose-Einstein condensation phenomenon. We discuss the different aspects of this phenomenon, namely, an onset of the Bose-Einstein condensation, particle number fluctuations, and a behavior of the Bose condensate. The obtained results can be helpful for interpreting the lattice QCD data at small temperature and large isospin chemical potential and the data on multiple pion production in high energy nuclear collisions. |
1703.04333 | Baiyang Zhang | Baiyang Zhang, Andrey Radzhabov, Nikolai Kochelev, Pengming Zhang | The Pauli Form Factor of Quark and Nontrivial Topological Structure of
the QCD | 5 pages, 4 figures,conclusion extended and references added | Phys. Rev. D 96, 054030 (2017) | 10.1103/PhysRevD.96.054030 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the electromagnetic Pauli form factor of quark induced by the
nontrivial topological fluctuations of QCD vacuum called instantons. It is
shown that such contribution is significant. We discuss the possible
implications of our result in the photon-hadron reactions and in the dynamics
of quark-photon interactions in the dense/hot quark matter.
| [
{
"created": "Mon, 13 Mar 2017 11:19:17 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Jul 2017 14:59:26 GMT",
"version": "v2"
}
] | 2017-10-04 | [
[
"Zhang",
"Baiyang",
""
],
[
"Radzhabov",
"Andrey",
""
],
[
"Kochelev",
"Nikolai",
""
],
[
"Zhang",
"Pengming",
""
]
] | We calculate the electromagnetic Pauli form factor of quark induced by the nontrivial topological fluctuations of QCD vacuum called instantons. It is shown that such contribution is significant. We discuss the possible implications of our result in the photon-hadron reactions and in the dynamics of quark-photon interactions in the dense/hot quark matter. |
hep-ph/0208278 | Anne Billups | Alfred H. Mueller (Columbia University, USA) | QCD in Nuclear Collisions | 15 pages, Latex, 6 figures | Nucl.Phys.A715:20-34,2003 | 10.1016/S0375-9474(02)01410-0 | CU-TP-1068 | hep-ph | null | The relationship between RHIC and HERA data is explored using the idea of
saturation (color glass condensate) as a unifying framework for interpretation.
A description of the early stages of a heavy ion collision is given with the
RHIC results. The relevant QCD dynamics at the various stages of a heavy ion
collision, from production of gluons to equilibration, is reviewed. Some
comments on current phenomenology are given.
| [
{
"created": "Fri, 30 Aug 2002 18:46:12 GMT",
"version": "v1"
}
] | 2011-01-25 | [
[
"Mueller",
"Alfred H.",
"",
"Columbia University, USA"
]
] | The relationship between RHIC and HERA data is explored using the idea of saturation (color glass condensate) as a unifying framework for interpretation. A description of the early stages of a heavy ion collision is given with the RHIC results. The relevant QCD dynamics at the various stages of a heavy ion collision, from production of gluons to equilibration, is reviewed. Some comments on current phenomenology are given. |
0707.3591 | Alexei Anisovich Dr | A. V. Sarantsev, et al | New results on the Roper resonance and the P_{11} partial wave | 14 pages, 6 figures | Phys.Lett.B659:94-100,2008 | 10.1016/j.physletb.2007.11.055 | null | hep-ph | null | Properties of the Roper resonance, the first scalar excitation of the
nucleon, are determined. Pole positions and residues of the $P_{11}$ partial
wave are studied in a combined analysis of pion- and photo-induced reactions.
We find the Roper pole at $\{(1371\pm7)-i(92\pm10)\}$ MeV and an elasticity of
$0.61\pm 0.03$. The largest decay coupling is found for the $N\sigma$
($\sigma=(\pi\pi)$-$S$-wave). The analysis is based on new data on $\gamma p\to
p\pi^0\pi^0$ for photons in the energy range from the two-pion threshold to 820
MeV from TAPS at Mainz and from 0.4 to 1.3 GeV from Crystal Barrel at Bonn and
includes further data from other experiments. The partial wave analysis
excludes the possibility that the Roper resonance is split into two states with
different partial decay widths.
| [
{
"created": "Tue, 24 Jul 2007 16:14:49 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Jul 2007 14:41:25 GMT",
"version": "v2"
},
{
"created": "Sun, 29 Jul 2007 06:38:54 GMT",
"version": "v3"
},
{
"created": "Fri, 30 Nov 2007 14:14:52 GMT",
"version": "v4"
}
] | 2008-11-26 | [
[
"Sarantsev",
"A. V.",
""
]
] | Properties of the Roper resonance, the first scalar excitation of the nucleon, are determined. Pole positions and residues of the $P_{11}$ partial wave are studied in a combined analysis of pion- and photo-induced reactions. We find the Roper pole at $\{(1371\pm7)-i(92\pm10)\}$ MeV and an elasticity of $0.61\pm 0.03$. The largest decay coupling is found for the $N\sigma$ ($\sigma=(\pi\pi)$-$S$-wave). The analysis is based on new data on $\gamma p\to p\pi^0\pi^0$ for photons in the energy range from the two-pion threshold to 820 MeV from TAPS at Mainz and from 0.4 to 1.3 GeV from Crystal Barrel at Bonn and includes further data from other experiments. The partial wave analysis excludes the possibility that the Roper resonance is split into two states with different partial decay widths. |
1211.4389 | Siamak Sadat Gousheh | N. Razzaghi and S. S. Gousheh | Generalized Friedberg-Lee model for CP violation in neutrino physics | 8 pages, 3 figures, published in Phys. Rev. D | Phys. Rev. D 86, 053006 (2012) | 10.1103/PhysRevD.86.053006 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a phenomenological model of Dirac neutrino mass operator based on
the Fridberg-Lee (FL) neutrino mass model to include CP violation. By
considering the most general set of complex coefficients, and imposing the
condition that the mass eigenvalues are real, we find a neutrino mass matrix
which is non-hermitian, symmetric and magic. In particular, we find that the
requirement of obtaining real mass eigenvalues by transferring the residual
phases to the mass eigenstates self-consistently, dictates the following
relationship between the imaginary part of the mass matrix elements $B$ and the
parameters of the FL model:
$B=\pm\sqrt{3/4(a-b_{r})^{2}\sin^{2}2\theta_{13}\cos^{2}\theta_{12}}$. We
obtain inverted neutrino mass hierarchy, $m_{3}=0$. Making a correspondence
between our model and the experimental data produces stringent conditions on
the parameters as follows:
$35.06^{\circ}\lesssim\theta_{12}\lesssim36.27^{\circ}$, $\theta_{23}=
45^{\circ}$, $7.27^{\circ}\lesssim\theta_{13}\lesssim11.09^{\circ}$, and
$82.03^{\circ}\lesssim\delta\lesssim85.37^{\circ}$. We get mildly broken
$\mu-\tau$ symmetry, which reduces the resultant neutrino mixing pattern from
tribimaximal (TBM) to trimaximal (TM). The CP violation as measured by the
Jarlskog parameter is restricted by $0.027\lesssim J\lesssim0.044$.
| [
{
"created": "Mon, 19 Nov 2012 12:30:16 GMT",
"version": "v1"
}
] | 2012-11-20 | [
[
"Razzaghi",
"N.",
""
],
[
"Gousheh",
"S. S.",
""
]
] | We propose a phenomenological model of Dirac neutrino mass operator based on the Fridberg-Lee (FL) neutrino mass model to include CP violation. By considering the most general set of complex coefficients, and imposing the condition that the mass eigenvalues are real, we find a neutrino mass matrix which is non-hermitian, symmetric and magic. In particular, we find that the requirement of obtaining real mass eigenvalues by transferring the residual phases to the mass eigenstates self-consistently, dictates the following relationship between the imaginary part of the mass matrix elements $B$ and the parameters of the FL model: $B=\pm\sqrt{3/4(a-b_{r})^{2}\sin^{2}2\theta_{13}\cos^{2}\theta_{12}}$. We obtain inverted neutrino mass hierarchy, $m_{3}=0$. Making a correspondence between our model and the experimental data produces stringent conditions on the parameters as follows: $35.06^{\circ}\lesssim\theta_{12}\lesssim36.27^{\circ}$, $\theta_{23}= 45^{\circ}$, $7.27^{\circ}\lesssim\theta_{13}\lesssim11.09^{\circ}$, and $82.03^{\circ}\lesssim\delta\lesssim85.37^{\circ}$. We get mildly broken $\mu-\tau$ symmetry, which reduces the resultant neutrino mixing pattern from tribimaximal (TBM) to trimaximal (TM). The CP violation as measured by the Jarlskog parameter is restricted by $0.027\lesssim J\lesssim0.044$. |
2203.08160 | Ariel Zhitnitsky | Ariel Zhitnitsky | The Pierre Auger Exotic Events and Axion Quark Nuggets | Many new comments and clarifications on relation with conventional
lightnings. Matches the published version in Journal of Physics G: Nuclear
and Particles Physics | J. Phys. G: Nucl. Part. Phys. 49 (2022) 105201 | 10.1088/1361-6471/ac8569 | null | hep-ph astro-ph.IM physics.ao-ph | http://creativecommons.org/licenses/by/4.0/ | The Pierre Auger Observatory have reported [1-3] observation of several
exotic cosmic ray -like events which apparently related to thunderstorms. These
events are much larger in size than conventional cosmic ray events, and they
have very distinct timing features. A possible nature of the observed
phenomenon is still a matter of active research and debates as many unusual
features of these exotic events are hard to explain. In particular, the
frequency of appearance of these exotic events is very low (less than 2
events/year), in huge contrast with a typical rate of a conventional lightning
strikes in the area. We propose that the observed exotic events can be
explained within the so-called axion quark nugget (AQN) dark matter model. The
idea is that the AQNs may trigger and initiate a special and unique class of
lightning strikes during a thunderstorm as a result of ionization of the
atmospheric molecules along its path. The corresponding AQN-induced lighting
flashes may show some specific features not shared by typical and much more
frequent conventional flashes. We support this proposal by demonstrating that
the observations[1-3], including the frequency of appearance and time duration
are consistent with observations. We also comment on possible relation of AUGER
exotic events with the Telescope Array bursts and the terrestrial gamma ray
flashes. We list a number of features of the AQN-induced exotic events (such as
specific radio pulses synchronized with these events) which can be directly
tested by future experiments. We also suggest to use distributed acoustic
sensing instruments to detect the acoustic pulses which must be synchronized
with AUGER exotic events.
| [
{
"created": "Tue, 15 Mar 2022 18:00:01 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Aug 2022 16:28:16 GMT",
"version": "v2"
}
] | 2022-08-25 | [
[
"Zhitnitsky",
"Ariel",
""
]
] | The Pierre Auger Observatory have reported [1-3] observation of several exotic cosmic ray -like events which apparently related to thunderstorms. These events are much larger in size than conventional cosmic ray events, and they have very distinct timing features. A possible nature of the observed phenomenon is still a matter of active research and debates as many unusual features of these exotic events are hard to explain. In particular, the frequency of appearance of these exotic events is very low (less than 2 events/year), in huge contrast with a typical rate of a conventional lightning strikes in the area. We propose that the observed exotic events can be explained within the so-called axion quark nugget (AQN) dark matter model. The idea is that the AQNs may trigger and initiate a special and unique class of lightning strikes during a thunderstorm as a result of ionization of the atmospheric molecules along its path. The corresponding AQN-induced lighting flashes may show some specific features not shared by typical and much more frequent conventional flashes. We support this proposal by demonstrating that the observations[1-3], including the frequency of appearance and time duration are consistent with observations. We also comment on possible relation of AUGER exotic events with the Telescope Array bursts and the terrestrial gamma ray flashes. We list a number of features of the AQN-induced exotic events (such as specific radio pulses synchronized with these events) which can be directly tested by future experiments. We also suggest to use distributed acoustic sensing instruments to detect the acoustic pulses which must be synchronized with AUGER exotic events. |
1711.08430 | Yongchao Zhang | P. S. Bhupal Dev, Rabindra N. Mohapatra, Yongchao Zhang | Lepton Flavor Violation Induced by a Neutral Scalar at Future Lepton
Colliders | 7 pages, 6 figures, 3 tables, minor changes, version to appear in PRL | Phys. Rev. Lett. 120, 221804 (2018) | 10.1103/PhysRevLett.120.221804 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Many new physics scenarios beyond the Standard Model often necessitate the
existence of a (light) neutral scalar $H$, which might couple to the charged
leptons in a flavor violating way, while evading all existing constraints. We
show that such scalars could be effectively produced at future lepton
colliders, either on-shell or off-shell depending on their mass, and induce
lepton flavor violating (LFV) signals, i.e. $e^+ e^- \to \ell_\alpha^\pm
\ell_\beta^\mp (+H)$ with $\alpha\neq \beta$. We find that a large parameter
space of the scalar mass and the LFV couplings can be probed, well beyond the
current low-energy constraints in the lepton sector. In particular, a
scalar-loop induced explanation of the longstanding muon $g-2$ anomaly can be
directly tested in the on-shell mode.
| [
{
"created": "Wed, 22 Nov 2017 18:25:49 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Feb 2018 03:31:25 GMT",
"version": "v2"
},
{
"created": "Tue, 15 May 2018 21:26:55 GMT",
"version": "v3"
}
] | 2018-06-04 | [
[
"Dev",
"P. S. Bhupal",
""
],
[
"Mohapatra",
"Rabindra N.",
""
],
[
"Zhang",
"Yongchao",
""
]
] | Many new physics scenarios beyond the Standard Model often necessitate the existence of a (light) neutral scalar $H$, which might couple to the charged leptons in a flavor violating way, while evading all existing constraints. We show that such scalars could be effectively produced at future lepton colliders, either on-shell or off-shell depending on their mass, and induce lepton flavor violating (LFV) signals, i.e. $e^+ e^- \to \ell_\alpha^\pm \ell_\beta^\mp (+H)$ with $\alpha\neq \beta$. We find that a large parameter space of the scalar mass and the LFV couplings can be probed, well beyond the current low-energy constraints in the lepton sector. In particular, a scalar-loop induced explanation of the longstanding muon $g-2$ anomaly can be directly tested in the on-shell mode. |
1704.02210 | Simone Marzani | Simone Marzani, Lais Schunk, and Gregory Soyez | A study of jet mass distributions with grooming | 38 pages; 17 figures. Version accepted by JHEP | JHEP 07 (2017) 132 | 10.1007/JHEP07(2017)132 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform a phenomenological study of the invariant mass distribution of
hadronic jets produced in proton-proton collisions, in conjunction a grooming
algorithm. In particular, we consider the modified MassDrop Tagger (mMDT),
which corresponds to Soft Drop with angular exponent $\beta=0$. Our
calculation, which is differential in both jet mass and jet transverse
momentum, resums large logarithms of the jet mass, including the full
dependence on the groomer's energy threshold $z_\text{cut}$, and it is matched
to fixed-order QCD matrix elements at next-to-leading order. In order to
account for non-perturbative contributions, originating from the hadronisation
process and from the underlying event, we also include a phenomenological
correction factor derived from Monte Carlo parton-shower simulations.
Furthermore, we consider two different possibilities for the jet transverse
momentum: before or after grooming. We show that the former should be preferred
for comparisons with upcoming experimental data essentially because the mMDT
transverse momentum spectrum is not collinear safe.
| [
{
"created": "Fri, 7 Apr 2017 12:48:31 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Jul 2017 12:50:56 GMT",
"version": "v2"
}
] | 2017-08-01 | [
[
"Marzani",
"Simone",
""
],
[
"Schunk",
"Lais",
""
],
[
"Soyez",
"Gregory",
""
]
] | We perform a phenomenological study of the invariant mass distribution of hadronic jets produced in proton-proton collisions, in conjunction a grooming algorithm. In particular, we consider the modified MassDrop Tagger (mMDT), which corresponds to Soft Drop with angular exponent $\beta=0$. Our calculation, which is differential in both jet mass and jet transverse momentum, resums large logarithms of the jet mass, including the full dependence on the groomer's energy threshold $z_\text{cut}$, and it is matched to fixed-order QCD matrix elements at next-to-leading order. In order to account for non-perturbative contributions, originating from the hadronisation process and from the underlying event, we also include a phenomenological correction factor derived from Monte Carlo parton-shower simulations. Furthermore, we consider two different possibilities for the jet transverse momentum: before or after grooming. We show that the former should be preferred for comparisons with upcoming experimental data essentially because the mMDT transverse momentum spectrum is not collinear safe. |
hep-ph/0411169 | John Gracey | J.A. Gracey | Two loop MSbar gluon pole mass from the LCO formalism | 16 latex pages | Eur.Phys.J. C39 (2005) 61-69 | 10.1140/epjc/s2004-02082-1 | LTH 642 | hep-ph | null | We compute the pole mass of the gluon in QCD from the local composite
operator formalism at two loops in the MSbar renormalization scheme. For
Yang-Mills theory an estimate of the mass at two loops is 2.13 Lambda_MSbar.
| [
{
"created": "Fri, 12 Nov 2004 14:45:11 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Gracey",
"J. A.",
""
]
] | We compute the pole mass of the gluon in QCD from the local composite operator formalism at two loops in the MSbar renormalization scheme. For Yang-Mills theory an estimate of the mass at two loops is 2.13 Lambda_MSbar. |
2103.00389 | Bai-Song Xie | Kun Wang, Xuehua Hu, Sayipjamal Dulat and B. S. Xie | Effect of symmetrical frequency chirp on pair production | 21 pages, 9 figures | null | 10.1088/1674-1056/abeee8 | null | hep-ph quant-ph | http://creativecommons.org/licenses/by/4.0/ | By using Dirac-Heisenberg-Wigner formalism we study electron-positron pair
production for linear, elliptic, nearly circular and circular polarizations of
electric fields with symmetrical frequency chirp, and we obtain Momentum
spectra and pair yield. The difference of results among polarized fields is
obvious for the small chirp. When the chirp parameter increases, the momentum
spectra tend to exhibit the multiphoton pair generation that is characterized
by the multi-concentric ring structure. The increase of number density is also
remarkable compared to the case of asymmetrical frequency chirp. Note that the
dynamically assisted Schwinger Mechanism plays an important role for the
enhanced pair production in the symmetrical frequency chirp.
| [
{
"created": "Sun, 28 Feb 2021 03:41:02 GMT",
"version": "v1"
}
] | 2021-08-11 | [
[
"Wang",
"Kun",
""
],
[
"Hu",
"Xuehua",
""
],
[
"Dulat",
"Sayipjamal",
""
],
[
"Xie",
"B. S.",
""
]
] | By using Dirac-Heisenberg-Wigner formalism we study electron-positron pair production for linear, elliptic, nearly circular and circular polarizations of electric fields with symmetrical frequency chirp, and we obtain Momentum spectra and pair yield. The difference of results among polarized fields is obvious for the small chirp. When the chirp parameter increases, the momentum spectra tend to exhibit the multiphoton pair generation that is characterized by the multi-concentric ring structure. The increase of number density is also remarkable compared to the case of asymmetrical frequency chirp. Note that the dynamically assisted Schwinger Mechanism plays an important role for the enhanced pair production in the symmetrical frequency chirp. |
hep-ph/9807376 | Lawrence M. Krauss | Lawrence M. Krauss (Case Western Reserve University) | A New Cosmological Paradigm: the Cosmological Constant and Dark Matter | 11 pages, latex, including 4 embedded figs. Based on invited lectures
at PASCOS98, Boston; Tropical Workshop on Particle Physics and Cosmology and
Particle Physics, San Juan; WEIN 98, Santa Fe. To appear in these proceedings | null | 10.1063/1.56598 | CWRU-P21-98 | hep-ph astro-ph | null | The Standard Cosmological Model of the 1980's is no more. I describe the
definitive evidence that the density of matter is insufficient to result in a
flat universe, as well as the mounting evidence that the cosmological constant
is not zero. I finally discuss the implications of these results for particle
physics and direct searches for non-baryonic dark matter, and demonstrate that
the new news is good news.
| [
{
"created": "Tue, 14 Jul 1998 21:44:10 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Krauss",
"Lawrence M.",
"",
"Case Western Reserve University"
]
] | The Standard Cosmological Model of the 1980's is no more. I describe the definitive evidence that the density of matter is insufficient to result in a flat universe, as well as the mounting evidence that the cosmological constant is not zero. I finally discuss the implications of these results for particle physics and direct searches for non-baryonic dark matter, and demonstrate that the new news is good news. |
hep-ph/9211312 | null | Jonathan L. Rosner | Electroweak Measurements and Top Quark Mass Limits | Presented at DPF 92 Meeting, Fermilab, November 1992. 5 pages, LaTeX,
2 PostScript figures available upon request. University of Chicago report EFI
92-58 | null | null | null | hep-ph | null | The agreement of electroweak measurements with theory places limits on the
masses of the top quark and the $W$ boson. It is shown how these limits arise
and what constraints various measurements (particularly a top quark mass
determination) would provide on the theory. The degree to which present and
future measurements can constrain the Higgs boson mass is examined.
| [
{
"created": "Wed, 25 Nov 1992 21:16:15 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Rosner",
"Jonathan L.",
""
]
] | The agreement of electroweak measurements with theory places limits on the masses of the top quark and the $W$ boson. It is shown how these limits arise and what constraints various measurements (particularly a top quark mass determination) would provide on the theory. The degree to which present and future measurements can constrain the Higgs boson mass is examined. |
1502.01372 | Zoltan Ligeti | Zoltan Ligeti | TASI Lectures on Flavor Physics | 42 pages, few typos corrected and references added, published verison | null | 10.1142/9789814678766_0006 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | These notes overlap with lectures given at the TASI summer schools in 2014
and 2011, as well as at the European School of High Energy Physics in 2013.
This is primarily an attempt at transcribing my hand-written notes, with
emphasis on topics and ideas discussed in the lectures. It is not a
comprehensive introduction or review of the field, nor does it include a
complete list of references. I hope, however, that some may find it useful to
better understand the reasons for excitement about recent progress and future
opportunities in flavor physics.
| [
{
"created": "Wed, 4 Feb 2015 21:56:05 GMT",
"version": "v1"
},
{
"created": "Tue, 19 May 2015 21:19:59 GMT",
"version": "v2"
}
] | 2015-10-28 | [
[
"Ligeti",
"Zoltan",
""
]
] | These notes overlap with lectures given at the TASI summer schools in 2014 and 2011, as well as at the European School of High Energy Physics in 2013. This is primarily an attempt at transcribing my hand-written notes, with emphasis on topics and ideas discussed in the lectures. It is not a comprehensive introduction or review of the field, nor does it include a complete list of references. I hope, however, that some may find it useful to better understand the reasons for excitement about recent progress and future opportunities in flavor physics. |
1505.04018 | Radoslaw Ryblewski | Radoslaw Ryblewski and Michael Strickland | Dilepton production from the quark-gluon plasma using leading-order
(3+1)D anisotropic hydrodynamics | Talk presented by Radoslaw Ryblewski at Excited QCD 2015, 8-14 March
2015, Tatranska Lomnica, Slovakia, 6 pages, 2 figures | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Dilepton production from the quark-gluon plasma (QGP) phase of
ultra-relativistic heavy-ion collisions is computed using the leading-order
(3+1)-dimensional anisotropic hydrodynamics. It is shown that high-energy
dilepton spectrum is sensitive to the initial local-rest-frame momentum-space
anisotropy of the QGP. Our findings suggest that it may be possible to
constrain the early-time momentum-space anisotropy in relativistic heavy-ion
collisions using high-energy dilepton yields.
| [
{
"created": "Fri, 15 May 2015 10:52:24 GMT",
"version": "v1"
}
] | 2015-05-18 | [
[
"Ryblewski",
"Radoslaw",
""
],
[
"Strickland",
"Michael",
""
]
] | Dilepton production from the quark-gluon plasma (QGP) phase of ultra-relativistic heavy-ion collisions is computed using the leading-order (3+1)-dimensional anisotropic hydrodynamics. It is shown that high-energy dilepton spectrum is sensitive to the initial local-rest-frame momentum-space anisotropy of the QGP. Our findings suggest that it may be possible to constrain the early-time momentum-space anisotropy in relativistic heavy-ion collisions using high-energy dilepton yields. |
1708.08733 | Sergey Afonin | S.S. Afonin | Note on relation between bottom-up holographic models and large-Nc QCD | 12 pages, some mistakes in formulae are corrected | Adv. High Energy Phys. 2017, 8358473 (2017) | 10.1155/2017/8358473 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss a derivation of the quadratic in fields part of action of
bottom-up holographic models from some general properties of the large-Nc limit
in QCD.
| [
{
"created": "Tue, 29 Aug 2017 13:11:39 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Jun 2018 13:09:15 GMT",
"version": "v2"
}
] | 2018-06-08 | [
[
"Afonin",
"S. S.",
""
]
] | We discuss a derivation of the quadratic in fields part of action of bottom-up holographic models from some general properties of the large-Nc limit in QCD. |
2009.06294 | Satyabrata Mahapatra | Debasish Borah (1), Satyabrata Mahapatra (2), Narendra Sahu (2) ((1)
Indian Institute of Technology Guwahati (2) Indian Institute of Technology
Hyderabad) | Connecting Low scale Seesaw for Neutrino Mass to Inelastic sub-GeV Dark
Matter with Abelian Gauge Symmetry | 42 pages, 18 figures, Accepted for publication in Nucl. Phys. B | null | 10.1016/j.nuclphysb.2021.115407 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by the recently reported excess of electron recoil events by the
XENON1T experiment, we propose low scale seesaw scenarios for light neutrino
masses within $U(1)_X$ gauge extension of the standard model that also predicts
stable as well as long lived dark sector particles. The new fields necessary
for seesaw realisation as well as dark matter are charged under the $U(1)_X$
gauge symmetry in an anomaly free way. A singlet scalar field which effectively
gives rise to lepton number violation and hence Majorana light neutrino masses
either at tree or radiative level, also splits the dark matter field into two
quasi-degenerate states. While sub-eV neutrino mass and non-zero dark matter
mass splitting are related in this way, the phenomenology of sub-GeV scale
inelastic dark matter can be very rich if the mass splitting is of keV scale.
We show that for suitable parameter space, both the components with keV
splitting can contribute to total dark matter density of the present universe,
while opening up the possibility of the heavier dark matter candidate to
undergo down-scattering with electrons. We check the parameter space of the
model for both fermion and scalar inelastic dark matter candidates which can
give rise to the XENON1T excess while being consistent with other
phenomenological bounds. We also discuss the general scenario where mass
splitting~$\Delta m$ between the two dark matter components can be larger,
effectively giving rise to a single component dark matter scenario.
| [
{
"created": "Mon, 14 Sep 2020 09:44:00 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Apr 2021 13:15:46 GMT",
"version": "v2"
}
] | 2021-06-30 | [
[
"Borah",
"Debasish",
""
],
[
"Mahapatra",
"Satyabrata",
""
],
[
"Sahu",
"Narendra",
""
]
] | Motivated by the recently reported excess of electron recoil events by the XENON1T experiment, we propose low scale seesaw scenarios for light neutrino masses within $U(1)_X$ gauge extension of the standard model that also predicts stable as well as long lived dark sector particles. The new fields necessary for seesaw realisation as well as dark matter are charged under the $U(1)_X$ gauge symmetry in an anomaly free way. A singlet scalar field which effectively gives rise to lepton number violation and hence Majorana light neutrino masses either at tree or radiative level, also splits the dark matter field into two quasi-degenerate states. While sub-eV neutrino mass and non-zero dark matter mass splitting are related in this way, the phenomenology of sub-GeV scale inelastic dark matter can be very rich if the mass splitting is of keV scale. We show that for suitable parameter space, both the components with keV splitting can contribute to total dark matter density of the present universe, while opening up the possibility of the heavier dark matter candidate to undergo down-scattering with electrons. We check the parameter space of the model for both fermion and scalar inelastic dark matter candidates which can give rise to the XENON1T excess while being consistent with other phenomenological bounds. We also discuss the general scenario where mass splitting~$\Delta m$ between the two dark matter components can be larger, effectively giving rise to a single component dark matter scenario. |
1203.2542 | Ken Mimasu | L. Basso, K. Mimasu and S. Moretti | Z' signals in polarised top-antitop final states | 21 pages, 6 colour figures, 10 tables | null | 10.1007/JHEP09(2012)024 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the sensitivity of top-antitop samples produced at all energy stages
of the Large Hadron Collider (LHC) to the nature of an underlying Z' boson, in
presence of full tree level standard model (SM) background effects and relative
interferences. We concentrate on differential mass spectra as well as both
spatial and spin asymmetries thereby demonstrating that exploiting combinations
of these observables will enable one to distinguish between sequential Z's and
those pertaining to Left-Right symmetric models as well as E6 inspired ones,
assuming realistic final state reconstruction efficiencies and error estimates.
| [
{
"created": "Mon, 12 Mar 2012 16:43:42 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Mar 2012 17:28:14 GMT",
"version": "v2"
}
] | 2015-06-04 | [
[
"Basso",
"L.",
""
],
[
"Mimasu",
"K.",
""
],
[
"Moretti",
"S.",
""
]
] | We study the sensitivity of top-antitop samples produced at all energy stages of the Large Hadron Collider (LHC) to the nature of an underlying Z' boson, in presence of full tree level standard model (SM) background effects and relative interferences. We concentrate on differential mass spectra as well as both spatial and spin asymmetries thereby demonstrating that exploiting combinations of these observables will enable one to distinguish between sequential Z's and those pertaining to Left-Right symmetric models as well as E6 inspired ones, assuming realistic final state reconstruction efficiencies and error estimates. |
2307.05667 | Julian Heeck | Jos\'e Ramon Espinosa, Julian Heeck, Mikheil Sokhashvili | The Tunneling Potential Approach to Q-Balls | 16 pages; fixed typo in Eq. (56) | Phys. Rev. D 108, 056019 (2023) | 10.1103/PhysRevD.108.056019 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Q-balls are bound-state configurations of complex scalars stabilized by a
conserved Noether charge Q. They are solutions to a second-order differential
equation that is structurally identical to Euclidean vacuum-decay bounce
solutions in three dimensions. This enables us to translate the recent
tunneling potential approach to Q-balls, which amounts to a reformulation of
the problem that can simplify the task of finding approximate and even exact
Q-ball solutions.
| [
{
"created": "Tue, 11 Jul 2023 18:00:01 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Sep 2023 19:21:37 GMT",
"version": "v2"
},
{
"created": "Wed, 15 Nov 2023 16:23:05 GMT",
"version": "v3"
}
] | 2023-11-16 | [
[
"Espinosa",
"José Ramon",
""
],
[
"Heeck",
"Julian",
""
],
[
"Sokhashvili",
"Mikheil",
""
]
] | Q-balls are bound-state configurations of complex scalars stabilized by a conserved Noether charge Q. They are solutions to a second-order differential equation that is structurally identical to Euclidean vacuum-decay bounce solutions in three dimensions. This enables us to translate the recent tunneling potential approach to Q-balls, which amounts to a reformulation of the problem that can simplify the task of finding approximate and even exact Q-ball solutions. |
hep-ph/9801245 | George Triantaphyllou | George Triantaphyllou (Munich Tech. U.) | Dynamical Mass Generation in a Finite-Temperature Abelian Gauge Theory | 20 LaTeX pages, 4 postscript figures in a single file, version to
appear in Physical Review D | Phys. Rev. D 58, 065006 (1998) | 10.1103/PhysRevD.58.065006 | TUM-HEP-304/97 | hep-ph | null | We write down the gap equation for the fermion self-energy in a
finite-temperature abelian gauge theory in three dimensions. The instantaneous
approximation is relaxed, momentum-dependent fermion and photon self-energies
are considered, and the corresponding Schwinger-Dyson equation is solved
numerically. The relation between the zero-momentum and zero-temperature
fermion self-energy and the critical temperature T_c, above which there is no
dynamical mass generation, is then studied. We also investigate the effect
which the number of fermion flavours N_f has on the results, and we give the
phase diagram of the theory with respect to T and N_f.
| [
{
"created": "Thu, 8 Jan 1998 14:53:26 GMT",
"version": "v1"
},
{
"created": "Thu, 21 May 1998 08:31:51 GMT",
"version": "v2"
}
] | 2016-08-25 | [
[
"Triantaphyllou",
"George",
"",
"Munich Tech. U."
]
] | We write down the gap equation for the fermion self-energy in a finite-temperature abelian gauge theory in three dimensions. The instantaneous approximation is relaxed, momentum-dependent fermion and photon self-energies are considered, and the corresponding Schwinger-Dyson equation is solved numerically. The relation between the zero-momentum and zero-temperature fermion self-energy and the critical temperature T_c, above which there is no dynamical mass generation, is then studied. We also investigate the effect which the number of fermion flavours N_f has on the results, and we give the phase diagram of the theory with respect to T and N_f. |
1307.3948 | Sunghoon Jung | Suyong Choi, Sunghoon Jung, P. Ko | Implications of LHC data on 125GeV Higgs-like boson for the Standard
Model and its various extensions | 43 pages, 9 figures (v2: typos corrected, references added) | null | 10.1007/JHEP10(2013)225 | KIAS-P13038 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent data on 125 GeV Higgs-like boson at the LHC starts to constrain the
electroweak symmetry breaking sector of the SM and its various extensions. If
one imposes the local gauge symmetry of the Standard Model (SM) ($SU(3)_c
\times SU(2)_L \times U(1)_Y$) to the SM and any possible new physics
scenarios, the SM Higgs properties will be modified by intrinsically two
different ways: by new physics either coupling directly to the SM Higgs boson
$h$, or affecting indirectly the SM Higgs properties through the mixing of $h$
with a SM singlet scalar $s$. The models of two Higgs doublet, extra sequential
and mirror fermions belong to the first category, whereas the models with a
hidden sector dark matter, extra vector-like fermions and new charged vector
bosons, which can enhance the diphoton rate of the SM Higgs-like resonance,
belong to the second category. We perform a global fit to data in terms of the
effective Lagrangian description of two interaction eigenstates of scalar
bosons, a SM Higgs and a singlet scalar, and their mixing. This framework is
more suitable to study singlet-extended scenarios discussed above compared to
other approaches based on the Lagrangian of mass eigenstates. With fairly
model-independent assumptions, the effective Lagrangian contains at most four
free parameters still encompassing the majority of models in the literature.
Interestingly, the SM gives the best fit if all data from ATLAS and CMS are
used, whereas various singlet extensions can fit better to individual ATLAS or
CMS data. Without further assumptions, an upper bound on the total width (or,
non-standard branching ratio) is generically obtained. Furthermore, global fit
based on our parameterization can be used to probe interactions of the singlet
scalar if the singlet resides below $2m_W$.
| [
{
"created": "Mon, 15 Jul 2013 14:03:27 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Aug 2013 02:38:20 GMT",
"version": "v2"
}
] | 2015-06-16 | [
[
"Choi",
"Suyong",
""
],
[
"Jung",
"Sunghoon",
""
],
[
"Ko",
"P.",
""
]
] | Recent data on 125 GeV Higgs-like boson at the LHC starts to constrain the electroweak symmetry breaking sector of the SM and its various extensions. If one imposes the local gauge symmetry of the Standard Model (SM) ($SU(3)_c \times SU(2)_L \times U(1)_Y$) to the SM and any possible new physics scenarios, the SM Higgs properties will be modified by intrinsically two different ways: by new physics either coupling directly to the SM Higgs boson $h$, or affecting indirectly the SM Higgs properties through the mixing of $h$ with a SM singlet scalar $s$. The models of two Higgs doublet, extra sequential and mirror fermions belong to the first category, whereas the models with a hidden sector dark matter, extra vector-like fermions and new charged vector bosons, which can enhance the diphoton rate of the SM Higgs-like resonance, belong to the second category. We perform a global fit to data in terms of the effective Lagrangian description of two interaction eigenstates of scalar bosons, a SM Higgs and a singlet scalar, and their mixing. This framework is more suitable to study singlet-extended scenarios discussed above compared to other approaches based on the Lagrangian of mass eigenstates. With fairly model-independent assumptions, the effective Lagrangian contains at most four free parameters still encompassing the majority of models in the literature. Interestingly, the SM gives the best fit if all data from ATLAS and CMS are used, whereas various singlet extensions can fit better to individual ATLAS or CMS data. Without further assumptions, an upper bound on the total width (or, non-standard branching ratio) is generically obtained. Furthermore, global fit based on our parameterization can be used to probe interactions of the singlet scalar if the singlet resides below $2m_W$. |
1511.06806 | Julian Ingham | Michael Kuchiev, Julian Ingham | Enhanced creation of high energy particles in colliding laser beams | null | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The creation of particles by two colliding strong laser beams is considered.
It is found that the electron-positron pairs created in the laser field via the
Schwinger mechanism may recollide after one or several oscillations in the
field. Their collision can take place at high energy, which the pair gains from
the field. As a result, high energy gamma quanta can be created by inelastic
scattering or annihilation of the pair. Moreover, heavy particles such as muon
pairs may also be created via the annihilation $e^+ + e^-\rightarrow \mu^+ +
\mu^- $. The probability of $e^-e^+$ collision is greatly enhanced due to a
strong alignment of the electron and positron momenta with the electric field.
The found muon creation rate exponentially exceeds the rate predicted by the
direct Schwinger mechanism for muons, while the photon creation rate
exponentially exceeds photon emission due to the fermion oscillation.
| [
{
"created": "Sat, 21 Nov 2015 00:43:02 GMT",
"version": "v1"
}
] | 2015-11-24 | [
[
"Kuchiev",
"Michael",
""
],
[
"Ingham",
"Julian",
""
]
] | The creation of particles by two colliding strong laser beams is considered. It is found that the electron-positron pairs created in the laser field via the Schwinger mechanism may recollide after one or several oscillations in the field. Their collision can take place at high energy, which the pair gains from the field. As a result, high energy gamma quanta can be created by inelastic scattering or annihilation of the pair. Moreover, heavy particles such as muon pairs may also be created via the annihilation $e^+ + e^-\rightarrow \mu^+ + \mu^- $. The probability of $e^-e^+$ collision is greatly enhanced due to a strong alignment of the electron and positron momenta with the electric field. The found muon creation rate exponentially exceeds the rate predicted by the direct Schwinger mechanism for muons, while the photon creation rate exponentially exceeds photon emission due to the fermion oscillation. |
1711.02853 | Alexey Gulov | Alexey Gulov, Yaroslav Moroz | Optimal observables for $Z'$ models in annihilation leptonic processes | 13 pages, 8 figures, 8 tables | Phys. Rev. D 98, 115014 (2018) | 10.1103/PhysRevD.98.115014 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The optimal observables with the best ratio of signal to statistical
uncertainty are proposed for a bunch of popular models of the $Z'$ boson. They
are the cross sections integrated over the phase space of the final particles
with proper weight functions. It is shown that the proposed observables are
completely equivalent to the $\chi^2$ fit of the differential cross section, so
they could be used as an alternative of aggregating events into bins with
further minimization of the $\chi^2$ function, especially in preliminary
analysis of experimental data. Application of the observables to the maximum
likelihood estimate of the $Z'$ mass and the $Z$--$Z'$ mixing angle as well as
to the exclusion reach and statistical efficiency of the signal is investigated
in details.
| [
{
"created": "Wed, 8 Nov 2017 07:37:39 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Jan 2018 14:01:16 GMT",
"version": "v2"
},
{
"created": "Wed, 1 Aug 2018 10:29:17 GMT",
"version": "v3"
}
] | 2018-12-19 | [
[
"Gulov",
"Alexey",
""
],
[
"Moroz",
"Yaroslav",
""
]
] | The optimal observables with the best ratio of signal to statistical uncertainty are proposed for a bunch of popular models of the $Z'$ boson. They are the cross sections integrated over the phase space of the final particles with proper weight functions. It is shown that the proposed observables are completely equivalent to the $\chi^2$ fit of the differential cross section, so they could be used as an alternative of aggregating events into bins with further minimization of the $\chi^2$ function, especially in preliminary analysis of experimental data. Application of the observables to the maximum likelihood estimate of the $Z'$ mass and the $Z$--$Z'$ mixing angle as well as to the exclusion reach and statistical efficiency of the signal is investigated in details. |
0904.2304 | Nikolaos Stefanis | A. P. Bakulev, A. V. Pimikov, N. G. Stefanis | QCD sum rules with nonlocal condensates and the spacelike pion form
factor | 25 pages, 11 figures, 3 tables. v2 Fig. 7 and Ref. [17] corrected. v3
minor typos corrected; matches version published in Phys. Rev. D79 (2009)
093010 | Phys.Rev.D79:093010,2009 | 10.1103/PhysRevD.79.093010 | RUB-TPII-03/09 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a detailed investigation of the spacelike pion's electromagnetic
form factor using three-point QCD sum rules that exclusively involve nonlocal
condensates. Our main methodological tools are a spectral density which
includes $O(\alpha_s)$ corrections, a suitably improved Gaussian ansatz to
model the distribution of the average momentum of quarks in the QCD vacuum, and
a perturbative scheme that avoids Landau singularities. Using this framework,
we obtain predictions for the pion form factor together with error estimates
originating from intrinsic theoretical uncertainties owing to the perturbative
expansion and the nonperturbative method applied. We also discuss our results
in comparison with other calculations, in particular, with those following from
the AdS/QCD correspondence. We find good agreement of our predictions with
measurements in the range of momenta covered by the existing experimental data
between 1-10 GeV$^2$.
| [
{
"created": "Wed, 15 Apr 2009 13:00:54 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Apr 2009 12:43:50 GMT",
"version": "v2"
},
{
"created": "Fri, 29 May 2009 07:30:23 GMT",
"version": "v3"
}
] | 2009-06-25 | [
[
"Bakulev",
"A. P.",
""
],
[
"Pimikov",
"A. V.",
""
],
[
"Stefanis",
"N. G.",
""
]
] | We present a detailed investigation of the spacelike pion's electromagnetic form factor using three-point QCD sum rules that exclusively involve nonlocal condensates. Our main methodological tools are a spectral density which includes $O(\alpha_s)$ corrections, a suitably improved Gaussian ansatz to model the distribution of the average momentum of quarks in the QCD vacuum, and a perturbative scheme that avoids Landau singularities. Using this framework, we obtain predictions for the pion form factor together with error estimates originating from intrinsic theoretical uncertainties owing to the perturbative expansion and the nonperturbative method applied. We also discuss our results in comparison with other calculations, in particular, with those following from the AdS/QCD correspondence. We find good agreement of our predictions with measurements in the range of momenta covered by the existing experimental data between 1-10 GeV$^2$. |
1310.7011 | Nikolas Kauer | Nikolas Kauer | Interference effects for H --> WW/ZZ --> l anti-nu_l anti-l nu_l
searches in gluon fusion at the LHC | 22 pages, 2 figures, 9 tables; added 2 references, version to appear
in JHEP | null | 10.1007/JHEP12(2013)082 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | WW/ZZ interference for Higgs signal and continuum background as well as
signal-background interference is studied for same-flavour l anti-nu_l anti-l
nu_l final states produced in gluon-gluon scattering at the LHC for light and
heavy Higgs masses with minimal and realistic experimental selection cuts. For
the signal cross section, we find WW/ZZ interference effects of O(5%) at M_H =
126 GeV. For M_H >= 200 GeV, we find that WW/ZZ interference is negligible. For
the gg continuum background, we also find that WW/ZZ interference is
negligible. As general rule, we conclude that non-negligible WW/ZZ interference
effects occur only if at least one weak boson of the pair is dominantly
off-shell due to kinematic constraints. The subdominant weak boson pair
contribution induces a correction to the signal-background interference, which
is at the few percentage point level before search selection cuts. Optimised
selection cuts for M_H >~ 600 GeV are suggested.
| [
{
"created": "Fri, 25 Oct 2013 19:56:11 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Dec 2013 20:46:34 GMT",
"version": "v2"
}
] | 2015-06-17 | [
[
"Kauer",
"Nikolas",
""
]
] | WW/ZZ interference for Higgs signal and continuum background as well as signal-background interference is studied for same-flavour l anti-nu_l anti-l nu_l final states produced in gluon-gluon scattering at the LHC for light and heavy Higgs masses with minimal and realistic experimental selection cuts. For the signal cross section, we find WW/ZZ interference effects of O(5%) at M_H = 126 GeV. For M_H >= 200 GeV, we find that WW/ZZ interference is negligible. For the gg continuum background, we also find that WW/ZZ interference is negligible. As general rule, we conclude that non-negligible WW/ZZ interference effects occur only if at least one weak boson of the pair is dominantly off-shell due to kinematic constraints. The subdominant weak boson pair contribution induces a correction to the signal-background interference, which is at the few percentage point level before search selection cuts. Optimised selection cuts for M_H >~ 600 GeV are suggested. |
0806.0583 | Kazem Azizi | K. Azizi, F. Falahati, V. Bashiry, S. M. Zebarjad | Analysis of the Rare $B_c \to D_{s,d}^{*} l^+ l^-$ Decays in QCD | 20 Pages, 2 Figures and 5 Tables | Phys.Rev.D77:114024,2008 | 10.1103/PhysRevD.77.114024 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The rare $B_c \to D_{s,d}^{*} l^+ l^-$ decays are investigated in the
framework of the three point QCD sum rules approach. Considering the gluon
condensate corrections to the correlation function, the form factors relevant
to these transitions are calculated. The total decay width and branching ratio
for these decays are also evaluated. The results for the branching ratios are
in good agreement with the quark models.
| [
{
"created": "Tue, 3 Jun 2008 16:46:24 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Jun 2008 14:30:47 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Azizi",
"K.",
""
],
[
"Falahati",
"F.",
""
],
[
"Bashiry",
"V.",
""
],
[
"Zebarjad",
"S. M.",
""
]
] | The rare $B_c \to D_{s,d}^{*} l^+ l^-$ decays are investigated in the framework of the three point QCD sum rules approach. Considering the gluon condensate corrections to the correlation function, the form factors relevant to these transitions are calculated. The total decay width and branching ratio for these decays are also evaluated. The results for the branching ratios are in good agreement with the quark models. |
hep-ph/9908292 | Fedor Gubarev | F.V.Gubarev, M.I.Polikarpov, V.I. Zakharov | Physics of the Power Corrections in QCD | 35 pages, 6 figures. Lecture given by V.I.Zakharov at the Winter
School of physics of ITEP, February 1999. Minor corrections, references added | Surveys High Energ.Phys.15:89-144,2000 | 10.1080/01422410008229141 | ITEP-TH-36/99 | hep-ph hep-lat hep-th | null | We review the physics of the power corrections to the parton model. In the
first part, we consider the power corrections which characterize the infrared
sensitivity of Feynman graphs when the contribution of short distances
dominates. The second part is devoted to the hypothetical power corrections
associated with nonperturbative effects at small distances.
| [
{
"created": "Sat, 7 Aug 1999 08:30:29 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Aug 1999 05:09:53 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Gubarev",
"F. V.",
""
],
[
"Polikarpov",
"M. I.",
""
],
[
"Zakharov",
"V. I.",
""
]
] | We review the physics of the power corrections to the parton model. In the first part, we consider the power corrections which characterize the infrared sensitivity of Feynman graphs when the contribution of short distances dominates. The second part is devoted to the hypothetical power corrections associated with nonperturbative effects at small distances. |
hep-ph/0508050 | Eung Jin Chun | Eung Jin Chun | TeV leptogenesis in Z-prime models and its collider probe | 10 pages with 2 figures | Phys.Rev. D72 (2005) 095010 | 10.1103/PhysRevD.72.095010 | null | hep-ph | null | We show that the U(1)-prime models linked with the seesaw mechanism at TeV
scale can lead to a successful baryogenesis through soft leptogenesis with a
resonant behavior in the B parameter. Such a consideration constrains the
Z-prime mass to be larger than 2-3 TeV depending on the seesaw scale and the
spharelon rate. Together with multi-TeV Z-prime, large sneutrino-antisneutrino
mixing and CP violating phenomena required by TeV leptogenesis could be
searched for in future colliders by observing the distinct same-sign
dilepton--dichargino as well as dislepton--diHiggs signatures.
| [
{
"created": "Wed, 3 Aug 2005 21:06:53 GMT",
"version": "v1"
}
] | 2013-05-29 | [
[
"Chun",
"Eung Jin",
""
]
] | We show that the U(1)-prime models linked with the seesaw mechanism at TeV scale can lead to a successful baryogenesis through soft leptogenesis with a resonant behavior in the B parameter. Such a consideration constrains the Z-prime mass to be larger than 2-3 TeV depending on the seesaw scale and the spharelon rate. Together with multi-TeV Z-prime, large sneutrino-antisneutrino mixing and CP violating phenomena required by TeV leptogenesis could be searched for in future colliders by observing the distinct same-sign dilepton--dichargino as well as dislepton--diHiggs signatures. |
hep-ph/0109285 | Reinhard Alkofer | M. Oettel, L. von Smekal, and R. Alkofer | Relativistic Three-Quark Bound States in Separable Two-Quark
Approximation | 27 pages, 3 figures; submitted to Computer Physics Communications | Comput.Phys.Commun.144:63,2002; Comput.Phys.Commun.144:63-81,2002 | 10.1016/S0010-4655(01)00465-9 | ADP-01-34/T466; FAU-TP3-01/8; UNITU-THEP-01/20 | hep-ph nucl-th | null | Baryons as relativistic bound states in 3-quark correlations are described by
an effective Bethe-Salpeter equation when irreducible 3-quark interactions are
neglected and separable 2-quark correlations are assumed. We present an
efficient numerical method to calculate the nucleon mass and its covariant wave
function in this quantum field theoretic quark-diquark model with
quark-exchange interaction. Expanding the components of the spinorial wave
function in terms of Chebyshev polynomials, the four-dimensional integral
equations are in a first step reduced to a coupled set of one-dimensional ones.
This set of linear and homogeneous equations defines a generalised eigenvalue
problem. Representing the eigenvector corresponding to the largest eigenvalue,
the Chebyshev moments are then obtained by iteration. The nucleon mass is
implicitly determined by the eigenvalue, and its covariant wave function is
reconstructed from the moments within the Chebyshev approximation.
| [
{
"created": "Fri, 28 Sep 2001 14:24:11 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Oettel",
"M.",
""
],
[
"von Smekal",
"L.",
""
],
[
"Alkofer",
"R.",
""
]
] | Baryons as relativistic bound states in 3-quark correlations are described by an effective Bethe-Salpeter equation when irreducible 3-quark interactions are neglected and separable 2-quark correlations are assumed. We present an efficient numerical method to calculate the nucleon mass and its covariant wave function in this quantum field theoretic quark-diquark model with quark-exchange interaction. Expanding the components of the spinorial wave function in terms of Chebyshev polynomials, the four-dimensional integral equations are in a first step reduced to a coupled set of one-dimensional ones. This set of linear and homogeneous equations defines a generalised eigenvalue problem. Representing the eigenvector corresponding to the largest eigenvalue, the Chebyshev moments are then obtained by iteration. The nucleon mass is implicitly determined by the eigenvalue, and its covariant wave function is reconstructed from the moments within the Chebyshev approximation. |
2406.11647 | Jeremy Borden | Jeremy Borden, Yuri V. Kovchegov, Ming Li | Helicity Evolution at Small $x$: Quark to Gluon and Gluon to Quark
Transition Operators | 38 pages, 7 figures | null | null | null | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We include the quark to gluon and gluon to quark shock-wave transition
operators into the small Bjorken-$x$ evolution equations for helicity in the
flavor-singlet channel derived earlier. While such transitions do not affect
the large-$N_c$ version of the evolution equations for helicity, the large-$N_c
\& N_f$ equations are affected. ($N_c$ and $N_f$ are the numbers of quark
colors and flavors, respectively.) We derive the corresponding corrected
large-$N_c \& N_f$ equations for the polarized dipole amplitudes contributing
to the flavor-singlet quark and gluon helicity distributions in the
double-logarithmic approximation (DLA), resumming powers of $\alpha_s \, \ln^2
(1/x)$ with $\alpha_s$ the strong coupling constant. We solve these equations
iteratively and extract the polarized splitting functions up to four loops. We
show that our splitting functions agree with the fixed-order perturbative
calculations up to and including the existing three-loops results. Similar to
the large-$N_c$ helicity evolution in the shock-wave approach, our large-$N_c
\& N_f$ small-$x$ splitting functions agree with those obtained in the infrared
evolution equations framework up to three loops, but appear to slightly
disagree at four loops.
| [
{
"created": "Mon, 17 Jun 2024 15:30:35 GMT",
"version": "v1"
}
] | 2024-06-18 | [
[
"Borden",
"Jeremy",
""
],
[
"Kovchegov",
"Yuri V.",
""
],
[
"Li",
"Ming",
""
]
] | We include the quark to gluon and gluon to quark shock-wave transition operators into the small Bjorken-$x$ evolution equations for helicity in the flavor-singlet channel derived earlier. While such transitions do not affect the large-$N_c$ version of the evolution equations for helicity, the large-$N_c \& N_f$ equations are affected. ($N_c$ and $N_f$ are the numbers of quark colors and flavors, respectively.) We derive the corresponding corrected large-$N_c \& N_f$ equations for the polarized dipole amplitudes contributing to the flavor-singlet quark and gluon helicity distributions in the double-logarithmic approximation (DLA), resumming powers of $\alpha_s \, \ln^2 (1/x)$ with $\alpha_s$ the strong coupling constant. We solve these equations iteratively and extract the polarized splitting functions up to four loops. We show that our splitting functions agree with the fixed-order perturbative calculations up to and including the existing three-loops results. Similar to the large-$N_c$ helicity evolution in the shock-wave approach, our large-$N_c \& N_f$ small-$x$ splitting functions agree with those obtained in the infrared evolution equations framework up to three loops, but appear to slightly disagree at four loops. |
1112.5676 | Ruben Sandapen | J. R. Forshaw and R. Sandapen | Phenomenology of Distribution Amplitudes for the rho meson | 4 pages, 2 figures, presented at the 19th International Workshop on
Deep Inelastic Scattering and Related Subjects (DIS 2011), Jefferson Lab,
Newport News, April 2011. To appear in the Proceedings | null | null | MAN/HEP/2011/17 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report on a successful extraction of the twist-2 and twist-3 Distribution
Amplitudes (DAs) of the rho meson using the HERA data on diffractive rho
photoproduction. We extract these DAs using several Colour Glass Condensate
(CGC) inspired and a Regge inspired dipole models. All our extracted DAs are
consistent with Sum Rules and lattice predictions.
| [
{
"created": "Fri, 23 Dec 2011 23:45:55 GMT",
"version": "v1"
}
] | 2011-12-30 | [
[
"Forshaw",
"J. R.",
""
],
[
"Sandapen",
"R.",
""
]
] | We report on a successful extraction of the twist-2 and twist-3 Distribution Amplitudes (DAs) of the rho meson using the HERA data on diffractive rho photoproduction. We extract these DAs using several Colour Glass Condensate (CGC) inspired and a Regge inspired dipole models. All our extracted DAs are consistent with Sum Rules and lattice predictions. |
2301.01303 | Mitrajyoti Ghosh | Margarita Gavrilova, Mitrajyoti Ghosh, Yuval Grossman, Walter
Tangarife, Tien-Hsueh Tsai | Fermion pair radiation from accelerating classical systems | null | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Accelerating classical systems that couple to a fermion-antifermion pair at
the microscopic level can radiate pairs of fermions and lose energy in the
process. In this work, we derive the generalization of the Larmor formula for
fermion pair radiation. We focus on the case of a point-like classical source
in an elliptical orbit that emits fermions through vector and scalar mediators.
Ultra-light fermion emission from such systems becomes relevant when the mass
of the mediator is larger than the frequency of the periodic motion. This
enables us to probe regions of the parameter space that are inaccessible in
on-shell bosonic radiation. We apply our results to pulsar binaries with
mediators that couple to muons and neutrinos. Using current data on binary
period decays, we extract bounds on the parameters of such models.
| [
{
"created": "Tue, 3 Jan 2023 19:00:01 GMT",
"version": "v1"
}
] | 2023-01-05 | [
[
"Gavrilova",
"Margarita",
""
],
[
"Ghosh",
"Mitrajyoti",
""
],
[
"Grossman",
"Yuval",
""
],
[
"Tangarife",
"Walter",
""
],
[
"Tsai",
"Tien-Hsueh",
""
]
] | Accelerating classical systems that couple to a fermion-antifermion pair at the microscopic level can radiate pairs of fermions and lose energy in the process. In this work, we derive the generalization of the Larmor formula for fermion pair radiation. We focus on the case of a point-like classical source in an elliptical orbit that emits fermions through vector and scalar mediators. Ultra-light fermion emission from such systems becomes relevant when the mass of the mediator is larger than the frequency of the periodic motion. This enables us to probe regions of the parameter space that are inaccessible in on-shell bosonic radiation. We apply our results to pulsar binaries with mediators that couple to muons and neutrinos. Using current data on binary period decays, we extract bounds on the parameters of such models. |
hep-ph/0005107 | Kenji Morita | Kenji Morita, Shin Muroya, Hiroki Nakamura and Chiho Nonaka | Two-particle correlation from a relativistic fluid with a first order
phase transition | LaTeX, 4pages, 2 figures. To appear in the Proceedings of the
International Conference on Quark Nuclear Physics, Adelaide, Australia, 21-25
February, 2000 | Nucl.Phys. A680 (2000) 90-93 | 10.1016/S0375-9474(00)00395-X | WU-HEP-00-6, TWC-00-5 | hep-ph | null | We numerically calculate two-particle correlation functions of CERN-SPS 158
A GeV Pb+Pb central collisions based on a (3+1)-dimensional relativistic
hydrodynamics with a first order phase transition. We analyze the pair momentum
dependence of pion source sizes extracted from the
Yano-Koonin-Podgoretski\u{\i} (YKP) parametrization which is expected to give
the source sizes directly. We find that, even in the case of the first order
phase transition, the collective expansion and surface dominant freeze-out of
the fluid naturally lead to the opaque source for which the interpretation of
the temporal source parameter as the emission duration breaks down.
| [
{
"created": "Thu, 11 May 2000 12:29:46 GMT",
"version": "v1"
}
] | 2016-09-06 | [
[
"Morita",
"Kenji",
""
],
[
"Muroya",
"Shin",
""
],
[
"Nakamura",
"Hiroki",
""
],
[
"Nonaka",
"Chiho",
""
]
] | We numerically calculate two-particle correlation functions of CERN-SPS 158 A GeV Pb+Pb central collisions based on a (3+1)-dimensional relativistic hydrodynamics with a first order phase transition. We analyze the pair momentum dependence of pion source sizes extracted from the Yano-Koonin-Podgoretski\u{\i} (YKP) parametrization which is expected to give the source sizes directly. We find that, even in the case of the first order phase transition, the collective expansion and surface dominant freeze-out of the fluid naturally lead to the opaque source for which the interpretation of the temporal source parameter as the emission duration breaks down. |
hep-ph/0703315 | Magno Machado | M.B. Gay Ducati, M.M. Machado, M.V.T. Machado | Diffractive hadroproduction of W and Z bosons at high energies | 6 pages, 1 figure, 2 tables. Version to be published in Physical
Review D | Phys.Rev.D75:114013,2007 | 10.1103/PhysRevD.75.114013 | null | hep-ph | null | Results from a phenomenological analysis of $W$ and $Z$ hard diffractive
hadroproduction at high energies are reported. Using the Regge factorization
approach, we consider the recent diffractive parton density functions extracted
by the H1 Collaboration at DESY-HERA. In addition, we take into account
multiple Pomeron exchange corrections considering a gap survival probability
factor. It is find that the ratio of diffractive to non-diffractive boson
production is in good agreement with the CDF and D0 data. We make predictions
which could be compared to future measurements at the LHC.
| [
{
"created": "Fri, 30 Mar 2007 11:53:27 GMT",
"version": "v1"
},
{
"created": "Sat, 23 Jun 2007 17:58:41 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Ducati",
"M. B. Gay",
""
],
[
"Machado",
"M. M.",
""
],
[
"Machado",
"M. V. T.",
""
]
] | Results from a phenomenological analysis of $W$ and $Z$ hard diffractive hadroproduction at high energies are reported. Using the Regge factorization approach, we consider the recent diffractive parton density functions extracted by the H1 Collaboration at DESY-HERA. In addition, we take into account multiple Pomeron exchange corrections considering a gap survival probability factor. It is find that the ratio of diffractive to non-diffractive boson production is in good agreement with the CDF and D0 data. We make predictions which could be compared to future measurements at the LHC. |
1001.2176 | Susan Gardner | Susan Gardner | Shedding Light on the Symmetries of Dark Matter | 6 pages, Invited talk at the 4th International Symposium on
Symmetries in Subatomic Physics (SSP 2009), June 2-5, 2009, Taipei, Taiwan | Nucl.Phys.A844:234c-239c,2010 | 10.1016/j.nuclphysa.2010.05.041 | null | hep-ph astro-ph.CO astro-ph.HE nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I consider symmetries which could explain observed properties of dark matter,
namely, its stability on Gyr time scales or its relic density and discuss how
such symmetries can be discovered through the study of the propagation and
polarization of light in its transit through dark matter.
| [
{
"created": "Wed, 13 Jan 2010 14:23:00 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Gardner",
"Susan",
""
]
] | I consider symmetries which could explain observed properties of dark matter, namely, its stability on Gyr time scales or its relic density and discuss how such symmetries can be discovered through the study of the propagation and polarization of light in its transit through dark matter. |
hep-ph/0202218 | Concepcion Gonzalez-Garcia | M.C. Gonzalez-Garcia and M. Maltoni | Impact of two mass-scale oscillations on the analysis of atmospheric and
reactor neutrino data | Updated data, references added and typos corrected. Version to appear
in Eur.Phys.J.C | Eur.Phys.J.C26:417-428,2003 | 10.1140/epjc/s2002-01064-7 | CERN-TH/2002-035, IFIC/02-08 | hep-ph astro-ph hep-ex | null | We study the stability of the results of 3-nu oscillation analysis of
atmospheric and reactor neutrino data under departures of the one--dominant
mass scale approximation. In order to do so we perform the analysis of
atmospheric and reactor neutrino data in terms of three--neutrino oscillations
where the effect of both mass differences is explicitly considered. We study
the allowed parameter space resulting from this analysis as a function of the
mass splitting hierarchy parameter alpha = Delta m^2/Delta M^2 which
parametrizes the departure from the one--dominant mass scale approximation. We
consider schemes with both direct and inverted mass ordering. Our results show
that in the analysis of atmospheric data the derived range of the largest mass
splitting, Delta M^2$, is stable while the allowed ranges of mixing angles
sin^2 theta_{23} and sin^2 theta_{13} are wider than those obtained in the
one--dominant mass scale approximation. Inclusion of the CHOOZ reactor data in
the analysis results into the reduction of the parameter space in particular
for the mixing angles. As a consequence the final allowed ranges of parameters
from the combined analysis are only slightly broader than when obtained in the
one--dominant mass scale approximation.
| [
{
"created": "Sun, 24 Feb 2002 12:41:50 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Mar 2002 11:06:56 GMT",
"version": "v2"
},
{
"created": "Mon, 26 Aug 2002 15:30:08 GMT",
"version": "v3"
}
] | 2009-01-07 | [
[
"Gonzalez-Garcia",
"M. C.",
""
],
[
"Maltoni",
"M.",
""
]
] | We study the stability of the results of 3-nu oscillation analysis of atmospheric and reactor neutrino data under departures of the one--dominant mass scale approximation. In order to do so we perform the analysis of atmospheric and reactor neutrino data in terms of three--neutrino oscillations where the effect of both mass differences is explicitly considered. We study the allowed parameter space resulting from this analysis as a function of the mass splitting hierarchy parameter alpha = Delta m^2/Delta M^2 which parametrizes the departure from the one--dominant mass scale approximation. We consider schemes with both direct and inverted mass ordering. Our results show that in the analysis of atmospheric data the derived range of the largest mass splitting, Delta M^2$, is stable while the allowed ranges of mixing angles sin^2 theta_{23} and sin^2 theta_{13} are wider than those obtained in the one--dominant mass scale approximation. Inclusion of the CHOOZ reactor data in the analysis results into the reduction of the parameter space in particular for the mixing angles. As a consequence the final allowed ranges of parameters from the combined analysis are only slightly broader than when obtained in the one--dominant mass scale approximation. |
hep-ph/9710273 | Subir Sarkar | Subir Sarkar (Oxford) | Cosmological implications of neutrinos | 13 pages (LaTeX, espcrc2.sty) including 9 figures (epsf); Plenary
talk at the XVI International Workshop on Weak Interactions and Neutrinos,
Capri, 22-28 June 1997; to appear in the Proceedings (eds. G. Fiorillo, V.
Palladino and P. Strolin) ; References [11,28,52] revised | Nucl.Phys.Proc.Suppl.66:168-180,1998 | 10.1016/S0920-5632(98)00029-2 | OUTP-97-54P | hep-ph astro-ph | null | Massive neutrinos were the first proposed, and remain the most natural,
particle candidate for the dark matter. In the absence of firm laboratory
evidence for neutrino mass, considerations of the formation of large scale
structure in the universe provide a sensitive, albeit indirect, probe of this
possibility. Observations of galaxy clustering and large angle anisotropy in
the cosmic microwave background have been interpreted as requiring that
neutrinos provide about 20% of the critical density. However the need for such
`hot' dark matter is removed if the primordial spectrum of density fluctuations
is tilted below scale-invariance, as is often the case in physically realistic
inflationary models. This question will be resolved by forthcoming precision
measurements of microwave background anisotropy on small angular scales. This
data will also improve the nucleosynthesis bound on the number of neutrino
species and test whether decays of relic neutrinos could have ionized the
intergalactic medium.
| [
{
"created": "Tue, 7 Oct 1997 17:55:41 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Oct 1997 19:44:34 GMT",
"version": "v2"
}
] | 2011-02-16 | [
[
"Sarkar",
"Subir",
"",
"Oxford"
]
] | Massive neutrinos were the first proposed, and remain the most natural, particle candidate for the dark matter. In the absence of firm laboratory evidence for neutrino mass, considerations of the formation of large scale structure in the universe provide a sensitive, albeit indirect, probe of this possibility. Observations of galaxy clustering and large angle anisotropy in the cosmic microwave background have been interpreted as requiring that neutrinos provide about 20% of the critical density. However the need for such `hot' dark matter is removed if the primordial spectrum of density fluctuations is tilted below scale-invariance, as is often the case in physically realistic inflationary models. This question will be resolved by forthcoming precision measurements of microwave background anisotropy on small angular scales. This data will also improve the nucleosynthesis bound on the number of neutrino species and test whether decays of relic neutrinos could have ionized the intergalactic medium. |
1406.1150 | Daisuke Satow | Daisuke Satow and Ho-Ung Yee | Chiral Magnetic Effect at Weak Coupling with Relaxation Dynamics | 26 pages, 3 figures | Phys. Rev. D 90, 014027 (2014) | 10.1103/PhysRevD.90.014027 | BNL-105312-2014-JA, RBRC-1076, RIKEN-QHP-112 | hep-ph hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide a resolution of an old issue in weak coupling computation of the
Chiral Magnetic Effect (CME) current, where a free chiral fermion theory gives
two different results depending on the order of the two limits,
$\omega\rightarrow 0$ (frequency) and $k\rightarrow 0$ (spatial momentum). We
first argue based on hydrodynamics that in any reasonable interacting theory of
chiral fermions the non-commutativity between the two limits should be absent,
and we demonstrate this at weak coupling regime in two different frameworks:
kinetic theory in the relaxation time approximation, and diagrammatic
computation with resummation of damping rate. In the latter computation, we
also show that the "pinch" singularity, which would make the summation of
ladder diagrams necessary as in the P-even correlation function, is absent in
the relevant P-odd correlation function. The correct value of CME current is
reproduced even in the presence of relaxation dynamics in both computations.
| [
{
"created": "Wed, 4 Jun 2014 19:07:46 GMT",
"version": "v1"
}
] | 2014-07-22 | [
[
"Satow",
"Daisuke",
""
],
[
"Yee",
"Ho-Ung",
""
]
] | We provide a resolution of an old issue in weak coupling computation of the Chiral Magnetic Effect (CME) current, where a free chiral fermion theory gives two different results depending on the order of the two limits, $\omega\rightarrow 0$ (frequency) and $k\rightarrow 0$ (spatial momentum). We first argue based on hydrodynamics that in any reasonable interacting theory of chiral fermions the non-commutativity between the two limits should be absent, and we demonstrate this at weak coupling regime in two different frameworks: kinetic theory in the relaxation time approximation, and diagrammatic computation with resummation of damping rate. In the latter computation, we also show that the "pinch" singularity, which would make the summation of ladder diagrams necessary as in the P-even correlation function, is absent in the relevant P-odd correlation function. The correct value of CME current is reproduced even in the presence of relaxation dynamics in both computations. |
hep-ph/9812441 | Michael Nauenberg | Michael Nauenberg | Correlated Wave Packet treatment of Neutrino and Neutral Meson
Oscillations | 13 pages | Phys.Lett. B447 (1999) 23-30; Erratum-ibid. B452 (1999) 434 | 10.1016/S0370-2693(98)01556-1 | null | hep-ph | null | A quantum wave packet treatment of neutrino and neutral K and B meson
oscillations is presented which incorporates the recoil particle in the
production process, and includes the effect of the localization and lifetime of
the source assumed to be a resonance or unstable particle. This approach
removes the ambiguities in the conventional single particle treatment of these
oscillations with the recoil particle. A fundamental connection between the
stochastic decay time of the source and the space-time coordinates of the
correlated final state particles is derived.
| [
{
"created": "Fri, 18 Dec 1998 23:07:34 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Nauenberg",
"Michael",
""
]
] | A quantum wave packet treatment of neutrino and neutral K and B meson oscillations is presented which incorporates the recoil particle in the production process, and includes the effect of the localization and lifetime of the source assumed to be a resonance or unstable particle. This approach removes the ambiguities in the conventional single particle treatment of these oscillations with the recoil particle. A fundamental connection between the stochastic decay time of the source and the space-time coordinates of the correlated final state particles is derived. |
1212.3460 | Pierre Artoisenet | Pierre Artoisenet, Rikkert Frederix, Olivier Mattelaer, Robbert
Rietkerk | Automatic spin-entangled decays of heavy resonances in Monte Carlo
simulations | 17 pages, 6 figures, published version | Journal of High Energy Physics, Volume 2013, Issue 3 | 10.1007/JHEP03(2013)015 | NIKHEF/2012-021; CERN-PH-TH/2012-329 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a general method that allows one to decay narrow resonances in Les
Houches Monte Carlo events in an efficient and accurate way. The procedure
preserves both spin correlation and finite width effects to a very good
accuracy, and is therefore particularly suited for the decay of resonances in
production events generated at next-to-leading-order accuracy. The method is
implemented as a generic tool in the MadGraph framework, giving access to a
very large set of possible applications. We illustrate the validity of the
method and the code by applying it to the case of single top and top quark pair
production, and show its capabilities on the case of top quark pair production
in association with a Higgs boson.
| [
{
"created": "Fri, 14 Dec 2012 12:57:29 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Mar 2013 08:31:32 GMT",
"version": "v2"
}
] | 2013-03-12 | [
[
"Artoisenet",
"Pierre",
""
],
[
"Frederix",
"Rikkert",
""
],
[
"Mattelaer",
"Olivier",
""
],
[
"Rietkerk",
"Robbert",
""
]
] | We present a general method that allows one to decay narrow resonances in Les Houches Monte Carlo events in an efficient and accurate way. The procedure preserves both spin correlation and finite width effects to a very good accuracy, and is therefore particularly suited for the decay of resonances in production events generated at next-to-leading-order accuracy. The method is implemented as a generic tool in the MadGraph framework, giving access to a very large set of possible applications. We illustrate the validity of the method and the code by applying it to the case of single top and top quark pair production, and show its capabilities on the case of top quark pair production in association with a Higgs boson. |
hep-ph/0104283 | Vincenzo Barone | Vincenzo Barone, Alessandro Drago and Philip G. Ratcliffe | Transverse Polarisation of Quarks in Hadrons | small changes, references added, as finally published in Physics
Reports | Phys.Rept. 359 (2002) 1-168 | 10.1016/S0370-1573(01)00051-5 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review the present state of knowledge regarding the transverse
polarisation (or transversity) distributions of quarks. After some generalities
on transverse polarisation, we formally define the transversity distributions
within the framework of a classification of all leading-twist distribution
functions. We describe the QCD evolution of transversity at leading and
next-to-leading order. A comprehensive treatment of non-perturbative
calculations of transversity distributions (within the framework of quark
models, lattice QCD and QCD sum rules) is presented. The phenomenology of
transversity (in particular, in Drell-Yan processes and semi-inclusive
leptoproduction) is discussed in some detail. Finally, the prospects for future
measurements are outlined.
| [
{
"created": "Thu, 26 Apr 2001 17:20:57 GMT",
"version": "v1"
},
{
"created": "Sat, 19 May 2001 18:20:43 GMT",
"version": "v2"
},
{
"created": "Sat, 14 Mar 2009 23:13:08 GMT",
"version": "v3"
}
] | 2009-11-07 | [
[
"Barone",
"Vincenzo",
""
],
[
"Drago",
"Alessandro",
""
],
[
"Ratcliffe",
"Philip G.",
""
]
] | We review the present state of knowledge regarding the transverse polarisation (or transversity) distributions of quarks. After some generalities on transverse polarisation, we formally define the transversity distributions within the framework of a classification of all leading-twist distribution functions. We describe the QCD evolution of transversity at leading and next-to-leading order. A comprehensive treatment of non-perturbative calculations of transversity distributions (within the framework of quark models, lattice QCD and QCD sum rules) is presented. The phenomenology of transversity (in particular, in Drell-Yan processes and semi-inclusive leptoproduction) is discussed in some detail. Finally, the prospects for future measurements are outlined. |
0907.2352 | J. T. Londergan | J.T. Londergan, J.C. Peng, A.W. Thomas | Charge Symmetry at the Partonic Level | 50 pages, 32 figures | Rev.Mod.Phys.82:2009-2052,2010 | 10.1103/RevModPhys.82.2009 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This review article discusses the experimental and theoretical status of
partonic charge symmetry. It is shown how the partonic content of various
structure functions gets redefined when the assumption of charge symmetry is
relaxed. We review various theoretical and phenomenological models for charge
symmetry violation in parton distribution functions. We summarize the current
experimental upper limits on charge symmetry violation in parton distributions.
A series of experiments are presented, which might reveal partonic charge
symmetry violation, or alternatively might lower the current upper limits on
parton charge symmetry violation.
| [
{
"created": "Tue, 14 Jul 2009 13:35:24 GMT",
"version": "v1"
}
] | 2010-11-09 | [
[
"Londergan",
"J. T.",
""
],
[
"Peng",
"J. C.",
""
],
[
"Thomas",
"A. W.",
""
]
] | This review article discusses the experimental and theoretical status of partonic charge symmetry. It is shown how the partonic content of various structure functions gets redefined when the assumption of charge symmetry is relaxed. We review various theoretical and phenomenological models for charge symmetry violation in parton distribution functions. We summarize the current experimental upper limits on charge symmetry violation in parton distributions. A series of experiments are presented, which might reveal partonic charge symmetry violation, or alternatively might lower the current upper limits on parton charge symmetry violation. |
2305.20005 | Jes\'us Alejandro Miranda Hern\'andez | Pere Masjuan, Alejandro Miranda, Pablo Roig | $\tau$ data-driven evaluation of Euclidean windows for the hadronic
vacuum polarization | 15 pages, 4 figures, 4 tables. Accepted for publication in PLB | Physics Letters B Volume 850, March 2024, 138492 | 10.1016/j.physletb.2024.138492 | null | hep-ph hep-ex hep-lat | http://creativecommons.org/licenses/by/4.0/ | We compute for the first time the $\tau$ data-driven Euclidean windows for
the hadronic vacuum polarization contribution to the muon $g-2$. We show that
$\tau$-based results agree with the available lattice window evaluations and
with the full result. On the intermediate window, where all lattice evaluations
are rather precise and agree, $\tau$-based results are compatible with them.
This is particularly interesting, given that the disagreement of the $e^+e^-$
data-driven result with the lattice values in this window is the main cause for
their discrepancy, affecting the interpretation of the $a_\mu$ measurement in
terms of possible new physics.
| [
{
"created": "Wed, 31 May 2023 16:25:32 GMT",
"version": "v1"
},
{
"created": "Sun, 24 Dec 2023 06:05:42 GMT",
"version": "v2"
},
{
"created": "Thu, 25 Jan 2024 17:02:23 GMT",
"version": "v3"
}
] | 2024-02-07 | [
[
"Masjuan",
"Pere",
""
],
[
"Miranda",
"Alejandro",
""
],
[
"Roig",
"Pablo",
""
]
] | We compute for the first time the $\tau$ data-driven Euclidean windows for the hadronic vacuum polarization contribution to the muon $g-2$. We show that $\tau$-based results agree with the available lattice window evaluations and with the full result. On the intermediate window, where all lattice evaluations are rather precise and agree, $\tau$-based results are compatible with them. This is particularly interesting, given that the disagreement of the $e^+e^-$ data-driven result with the lattice values in this window is the main cause for their discrepancy, affecting the interpretation of the $a_\mu$ measurement in terms of possible new physics. |
0902.4109 | Alexander Goritschnig T. | A.T.Goritschnig, P.Kroll, W.Schweiger | $p\bar{p} \to \Lambda_c \bar{\Lambda}_c$ within a Handbag Picture --
Cross Section and Spin Observables | Talk given by A.T.Goritschnig at the "18th International Spin Physics
Symposium" (SPIN 2008), Charlottesville (VA), USA, Oct. 2008 | AIP Conf.Proc.1149:668-671,2009 | 10.1063/1.3215734 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the process $p\bar{p} \to \Lambda_c \bar{\Lambda}_c$ within the
generalized parton picture. Our starting point is the double handbag diagram
which factorizes into soft generalized parton distributions and a hard
subprocess amplitude for $u \bar{u} \to c \bar{c}$. Our cross-section
predictions may become interesting in view of forthcoming experiments at FAIR
in Darmstadt.
| [
{
"created": "Tue, 24 Feb 2009 10:13:21 GMT",
"version": "v1"
}
] | 2009-08-24 | [
[
"Goritschnig",
"A. T.",
""
],
[
"Kroll",
"P.",
""
],
[
"Schweiger",
"W.",
""
]
] | We study the process $p\bar{p} \to \Lambda_c \bar{\Lambda}_c$ within the generalized parton picture. Our starting point is the double handbag diagram which factorizes into soft generalized parton distributions and a hard subprocess amplitude for $u \bar{u} \to c \bar{c}$. Our cross-section predictions may become interesting in view of forthcoming experiments at FAIR in Darmstadt. |
hep-ph/0604230 | Rohini M. Godbole | Rohini M. Godbole | LHC-ILC synergy | 12 pages,8 figures, uses appolb.cls, talk presented at the PLC2005
workshop, Kazimierz, Poland, 5-8 September, to appear in Acta Physics
Polonica | Acta Phys.Polon. B37 (2006) 1225-1236 | null | IISc-CHEP-2/06 | hep-ph | null | I will begin by making a few general comments on the synergy between the
Large Hadron Collider (LHC) which will go in action in 2007 and the
International Linear Collider (ILC) which is under planning. I will then focus
on the synergy between the LHC and the PLC option at the ILC, which is expected
to be realised in the later stages of the ILC program. In this I will cover the
possible synergy in the Higgs sector (with and without CP violation), in the
determination of the anomalous vector boson couplings and last but not the
least, in the search for extra dimensions and radions.
| [
{
"created": "Wed, 26 Apr 2006 14:08:10 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Godbole",
"Rohini M.",
""
]
] | I will begin by making a few general comments on the synergy between the Large Hadron Collider (LHC) which will go in action in 2007 and the International Linear Collider (ILC) which is under planning. I will then focus on the synergy between the LHC and the PLC option at the ILC, which is expected to be realised in the later stages of the ILC program. In this I will cover the possible synergy in the Higgs sector (with and without CP violation), in the determination of the anomalous vector boson couplings and last but not the least, in the search for extra dimensions and radions. |
hep-ph/0203116 | Tomislav Ivezic | Ljuba Skovrlj and Tomislav Ivezic | About the Simultaneous Co-Existence of Instantaneous and Retarded
Interactions in Classical Electrodynamics | 7 pages, to be published in Int. J. Mod. Phys. A | Int.J.Mod.Phys. A17 (2002) 2513-2518 | 10.1142/S0217751X02010984 | null | hep-ph | null | In this paper it is proved that, contrary to the results found by A.E.
Chubykalo and S.J. Vlaev (Int. J. Mod. Phys. A 14, 3789 (1999)), the retarded
electric and magnetic fields for an uniformly accelerated charge exactly
satisfy Maxwell equations (ME). Furthermore it is shown that ME are correctly
written in the usual form with the partial derivatives and thus not, as
proposed by Chubykalo and Vlaev, with the total derivatives.
| [
{
"created": "Wed, 13 Mar 2002 13:13:36 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Skovrlj",
"Ljuba",
""
],
[
"Ivezic",
"Tomislav",
""
]
] | In this paper it is proved that, contrary to the results found by A.E. Chubykalo and S.J. Vlaev (Int. J. Mod. Phys. A 14, 3789 (1999)), the retarded electric and magnetic fields for an uniformly accelerated charge exactly satisfy Maxwell equations (ME). Furthermore it is shown that ME are correctly written in the usual form with the partial derivatives and thus not, as proposed by Chubykalo and Vlaev, with the total derivatives. |
1107.1259 | Alessandro Strumia | Alessandro Strumia | Implications of first LHC results | Talk at Moriond 2011. Updated to latest data (up to 165/pb) | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss implications of first LHC results for models motivated by the
hierarchy problem: large extra dimensions and supersymmetry. We present bounds,
global fits and implications for naturalness.
| [
{
"created": "Wed, 6 Jul 2011 21:03:37 GMT",
"version": "v1"
}
] | 2011-07-08 | [
[
"Strumia",
"Alessandro",
""
]
] | We discuss implications of first LHC results for models motivated by the hierarchy problem: large extra dimensions and supersymmetry. We present bounds, global fits and implications for naturalness. |
hep-ph/9810421 | Joao M. Soares | Joao M. Soares (University of Massachusetts) | Form factor relations for heavy-to-light meson transitions: tests of the
Quark Model predictions | 21 pages, Latex, submitted to Phys. Rev. D (Oct. 1998) | null | null | null | hep-ph | null | In the case of heavy-to-light weak meson transitions, a Quark Model
derivation leads to very general relations between the form factors that
parametrize the hadronic matrix elements. We investigate to what extent these
form factor relations remain a good approximation, beyond the Quark Model.
In heavy-to-light pseudoscalar-to-vector meson transitions, a simple argument
shows that the V-A structure of the weak interaction leads to a strong
suppression of the helicity h=+1 amplitude - an effect that has been confirmed
experimentally by the CLEO Collaboration, with a full angular analysis of the B
-> K* J/psi decay. We show that the theoretical predictions, in terms of the
hadronic form factors, can accommodate the suppression of the h=+1 amplitude,
only if the Quark Model relations are verified. Moreover, the form factor
relations also allow us to predict the ratio of the two remaining helicity
amplitudes, with h=0 and h=-1; here too, there is excellent agreement with the
CLEO data for the B -> K* J/psi decay. In the future, similar experimental
tests can be carried out, with a few advantages, using the semileptonic decay B
-> rho l- nu_l.
The Quark Model relations can also be tested against the predictions for the
hadronic form factors, from the more powerful theoretical methods of Lattice
QCD and Light Cone Sum-Rules. The excellent agreement points once again to the
validity of the form factor relations, beyond the Quark Model framework where
they were derived.
| [
{
"created": "Tue, 20 Oct 1998 16:13:46 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Soares",
"Joao M.",
"",
"University of Massachusetts"
]
] | In the case of heavy-to-light weak meson transitions, a Quark Model derivation leads to very general relations between the form factors that parametrize the hadronic matrix elements. We investigate to what extent these form factor relations remain a good approximation, beyond the Quark Model. In heavy-to-light pseudoscalar-to-vector meson transitions, a simple argument shows that the V-A structure of the weak interaction leads to a strong suppression of the helicity h=+1 amplitude - an effect that has been confirmed experimentally by the CLEO Collaboration, with a full angular analysis of the B -> K* J/psi decay. We show that the theoretical predictions, in terms of the hadronic form factors, can accommodate the suppression of the h=+1 amplitude, only if the Quark Model relations are verified. Moreover, the form factor relations also allow us to predict the ratio of the two remaining helicity amplitudes, with h=0 and h=-1; here too, there is excellent agreement with the CLEO data for the B -> K* J/psi decay. In the future, similar experimental tests can be carried out, with a few advantages, using the semileptonic decay B -> rho l- nu_l. The Quark Model relations can also be tested against the predictions for the hadronic form factors, from the more powerful theoretical methods of Lattice QCD and Light Cone Sum-Rules. The excellent agreement points once again to the validity of the form factor relations, beyond the Quark Model framework where they were derived. |
hep-ph/9601378 | Javier M. Hernandez Lopez | J. M. Hern\'andez (1), M. A. P\'erez (1) and J. J. Toscano (2) ((1)
Cinvestav, (2) FCFM, Puebla) | New Physics Effects on Higgs Production at $\gamma \gamma $ Colliders | Latex, 6 pages, 4 eps figures, to appear in the Proceedings of the V
Mexican Workshop of Particles and Fields, Puebla, Mexico, October 1995 | Phys.Lett.B375:227-232,1996 | 10.1016/0370-2693(96)00183-9 | null | hep-ph | null | We study heavy physics effects on the Higgs production in $\gamma \gamma $
fusion using the effective Lagrangian approach. We find that the effects coming
from new physics may enhance the standard model predictions for the number of
events expected in the final states $\bar bb$, $WW$, and $ZZ$ up to one order
of magnitude, whereas the corresponding number of events for the final state
$\bar tt$ may be enhanced up to two orders of magnitude.
| [
{
"created": "Wed, 31 Jan 1996 07:39:28 GMT",
"version": "v1"
}
] | 2009-10-05 | [
[
"Hernández",
"J. M.",
""
],
[
"Pérez",
"M. A.",
""
],
[
"Toscano",
"J. J.",
""
]
] | We study heavy physics effects on the Higgs production in $\gamma \gamma $ fusion using the effective Lagrangian approach. We find that the effects coming from new physics may enhance the standard model predictions for the number of events expected in the final states $\bar bb$, $WW$, and $ZZ$ up to one order of magnitude, whereas the corresponding number of events for the final state $\bar tt$ may be enhanced up to two orders of magnitude. |
1706.06260 | Mark Mace | Kevin Dusling, Mark Mace, Raju Venugopalan | Parton model description of multiparticle azimuthal correlations in $pA$
collisions | 26 pages, 22 figures, 1 appendix. v2: Further discussions and
references added; version accepted for publication in Phys. Rev. D | Phys. Rev. D 97, 016014 (2018) | 10.1103/PhysRevD.97.016014 | null | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In arXiv:1705.00745, an initial state "parton model" of quarks scattering off
a dense nuclear target was shown to qualitatively reproduce the systematics of
multiparticle azimuthal anisotropy cumulants measured in
proton/deuteron-nucleus ($pA$) collisions at RHIC and the LHC. The systematics
included i) the behavior of the four-particle cumulant $c_2\{4\}$, which
generates a real four-particle second Fourier harmonic $v_2\{4\}$, ii) the
ordering $v_2\{2\}>v_2\{4\}\approx v_2\{6\}\approx v_2\{8\}$ for two-, four-,
six-, and eight-particle Fourier harmonics, iii) the behavior of so-called
symmetric cumulants $\text{SC}(2,3)$ and $\text{SC}(2,4)$. These features of
azimuthal multiparticle cumulants were previously interpreted as a signature of
hydrodynamic flow; our results challenge this interpretation. We expand here
upon our previous study and present further details and novel results on the
saturation scale and transverse momentum ($p_\perp$) dependence of
multiparticle azimuthal correlations. We find that the dependence of $v_2\{2\}$
and $v_2\{4\}$ on the number of color domains in the target varies with the
$p_\perp$ window explored. We extend our prior discussion of symmetric
cumulants and compute as yet unmeasured symmetric cumulants. We investigate the
$N_c$ dependence of $v_2\{2\}$ and $v_2\{4\}$. We contrast our results, which
include multiple scatterings of each quark off the target, to the Glasma graph
approximation, where each quark suffers at most two gluon exchanges with the
target. We find that coherent multiple scattering is essential to obtain a
positive definite $v_2\{4\}$. We provide an algorithm to compute expectation
values of arbitrary products of the "dipole" lightlike Wilson line correlators.
| [
{
"created": "Tue, 20 Jun 2017 04:06:36 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Jan 2018 19:23:43 GMT",
"version": "v2"
}
] | 2018-01-31 | [
[
"Dusling",
"Kevin",
""
],
[
"Mace",
"Mark",
""
],
[
"Venugopalan",
"Raju",
""
]
] | In arXiv:1705.00745, an initial state "parton model" of quarks scattering off a dense nuclear target was shown to qualitatively reproduce the systematics of multiparticle azimuthal anisotropy cumulants measured in proton/deuteron-nucleus ($pA$) collisions at RHIC and the LHC. The systematics included i) the behavior of the four-particle cumulant $c_2\{4\}$, which generates a real four-particle second Fourier harmonic $v_2\{4\}$, ii) the ordering $v_2\{2\}>v_2\{4\}\approx v_2\{6\}\approx v_2\{8\}$ for two-, four-, six-, and eight-particle Fourier harmonics, iii) the behavior of so-called symmetric cumulants $\text{SC}(2,3)$ and $\text{SC}(2,4)$. These features of azimuthal multiparticle cumulants were previously interpreted as a signature of hydrodynamic flow; our results challenge this interpretation. We expand here upon our previous study and present further details and novel results on the saturation scale and transverse momentum ($p_\perp$) dependence of multiparticle azimuthal correlations. We find that the dependence of $v_2\{2\}$ and $v_2\{4\}$ on the number of color domains in the target varies with the $p_\perp$ window explored. We extend our prior discussion of symmetric cumulants and compute as yet unmeasured symmetric cumulants. We investigate the $N_c$ dependence of $v_2\{2\}$ and $v_2\{4\}$. We contrast our results, which include multiple scatterings of each quark off the target, to the Glasma graph approximation, where each quark suffers at most two gluon exchanges with the target. We find that coherent multiple scattering is essential to obtain a positive definite $v_2\{4\}$. We provide an algorithm to compute expectation values of arbitrary products of the "dipole" lightlike Wilson line correlators. |
2005.08979 | Doojin Kim | Albert De Roeck, Doojin Kim, Zahra Gh. Moghaddam, Jong-Chul Park,
Seodong Shin, Leigh H. Whitehead | Probing Energetic Light Dark Matter with Multi-Particle Tracks
Signatures at DUNE | 35 pages, 11 figures, 2 tables, journal published version | null | 10.1007/JHEP11(2020)043 | MI-TH-2011 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The search for relativistic scattering signals of cosmogenic light dark
matter at terrestrial detectors has received increasing attention as an
alternative approach to probe dark-sector physics. Large-volume neutrino
experiments are well motivated for searches of dark matter that interacts very
weakly with Standard Model particles and/or that exhibits a small incoming
flux. We perform a dedicated signal sensitivity study for a detector similar to
the one proposed by the DUNE Collaboration for cosmogenic dark-matter signals
resulting from a non-minimal multi-particle dark-sector scenario. The liquid
argon time projection chamber technology adopted for the DUNE detectors is
particularly suited for searching for complicated signatures owing to good
measurement resolution and particle identification, as well as $dE/dx$
measurements to recognize merged tracks. Taking inelastic boosted dark matter
as our benchmark scenario that allows for multiple visible particles in the
final state, we demonstrate that the DUNE far detectors have a great potential
for probing scattering signals induced by relativistic light dark matter.
Detector effects and backgrounds have been estimated and taken into account.
Model-dependent and model-independent expected sensitivity limits for a
DUNE-like detector are presented.
| [
{
"created": "Mon, 18 May 2020 18:00:02 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Feb 2021 02:17:47 GMT",
"version": "v2"
}
] | 2021-02-02 | [
[
"De Roeck",
"Albert",
""
],
[
"Kim",
"Doojin",
""
],
[
"Moghaddam",
"Zahra Gh.",
""
],
[
"Park",
"Jong-Chul",
""
],
[
"Shin",
"Seodong",
""
],
[
"Whitehead",
"Leigh H.",
""
]
] | The search for relativistic scattering signals of cosmogenic light dark matter at terrestrial detectors has received increasing attention as an alternative approach to probe dark-sector physics. Large-volume neutrino experiments are well motivated for searches of dark matter that interacts very weakly with Standard Model particles and/or that exhibits a small incoming flux. We perform a dedicated signal sensitivity study for a detector similar to the one proposed by the DUNE Collaboration for cosmogenic dark-matter signals resulting from a non-minimal multi-particle dark-sector scenario. The liquid argon time projection chamber technology adopted for the DUNE detectors is particularly suited for searching for complicated signatures owing to good measurement resolution and particle identification, as well as $dE/dx$ measurements to recognize merged tracks. Taking inelastic boosted dark matter as our benchmark scenario that allows for multiple visible particles in the final state, we demonstrate that the DUNE far detectors have a great potential for probing scattering signals induced by relativistic light dark matter. Detector effects and backgrounds have been estimated and taken into account. Model-dependent and model-independent expected sensitivity limits for a DUNE-like detector are presented. |
0704.0625 | Vladimir Kuksa | V.A.Beylin, V.I.Kuksa, G.M.Vereshkov, R.S.Pasechnik | Renormgroup origin and analysis of Split Higgsino scenario | 16 pages, 1 figure | null | null | null | hep-ph | null | We present a renormalization group motivation of scale hierarchies in SUSY
SU(5) model. The Split Higgsino scanrio with a high scale of the SUSY breaking
is considered in detail. Its manifestations in experiments are discussed.
| [
{
"created": "Wed, 4 Apr 2007 17:35:12 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Beylin",
"V. A.",
""
],
[
"Kuksa",
"V. I.",
""
],
[
"Vereshkov",
"G. M.",
""
],
[
"Pasechnik",
"R. S.",
""
]
] | We present a renormalization group motivation of scale hierarchies in SUSY SU(5) model. The Split Higgsino scanrio with a high scale of the SUSY breaking is considered in detail. Its manifestations in experiments are discussed. |
0902.2062 | Zhi-Gang Wang | Zhi-Gang Wang | Mass spectrum of the scalar hidden charm and bottom tetraquark states | 19 pages, 36 figures, slight revision | Phys.Rev.D79:094027,2009 | 10.1103/PhysRevD.79.094027 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article, we study the mass spectrum of the scalar hidden charm and
bottom tetraquark states with the QCD sum rules. The numerical results are
compared with the corresponding ones from a relativistic quark model based on a
quasipotential approach in QCD. The relevant values from the constituent
diquark model based on the constituent diquark masses and the spin-spin
interactions are also discussed.
| [
{
"created": "Thu, 12 Feb 2009 09:43:09 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Feb 2009 01:29:29 GMT",
"version": "v2"
},
{
"created": "Mon, 13 Apr 2009 08:33:28 GMT",
"version": "v3"
},
{
"created": "Fri, 24 Apr 2009 14:19:47 GMT",
"version": "v4"
}
] | 2010-04-23 | [
[
"Wang",
"Zhi-Gang",
""
]
] | In this article, we study the mass spectrum of the scalar hidden charm and bottom tetraquark states with the QCD sum rules. The numerical results are compared with the corresponding ones from a relativistic quark model based on a quasipotential approach in QCD. The relevant values from the constituent diquark model based on the constituent diquark masses and the spin-spin interactions are also discussed. |
1504.04019 | Fatemeh Elahi | Joseph Bramante, Fatemeh Elahi | Higgs portals to pulsar collapse | 12 pages, 3 figures | Phys. Rev. D 91, 115001 (2015) | 10.1103/PhysRevD.91.115001 | null | hep-ph astro-ph.HE astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Pulsars apparently missing from the galactic center could have been destroyed
by asymmetric fermionic dark matter ($m_X = 1-100$ GeV) coupled to a light
scalar ($m_{\phi}= 5-20$ MeV), which mixes with the Higgs boson. We point out
that this pulsar-collapsing dark sector can resolve the core-cusp problem and
will either be excluded or discovered by upcoming direct detection experiments.
Another implication is a maximum pulsar age curve that increases with distance
from the galactic center, with a normalization that depends on the couplings
and masses of dark sector particles. In addition, we use old pulsars outside
the galactic center to place bounds on asymmetric Higgs portal models.
| [
{
"created": "Wed, 15 Apr 2015 20:00:48 GMT",
"version": "v1"
},
{
"created": "Wed, 27 May 2015 20:11:54 GMT",
"version": "v2"
}
] | 2015-06-10 | [
[
"Bramante",
"Joseph",
""
],
[
"Elahi",
"Fatemeh",
""
]
] | Pulsars apparently missing from the galactic center could have been destroyed by asymmetric fermionic dark matter ($m_X = 1-100$ GeV) coupled to a light scalar ($m_{\phi}= 5-20$ MeV), which mixes with the Higgs boson. We point out that this pulsar-collapsing dark sector can resolve the core-cusp problem and will either be excluded or discovered by upcoming direct detection experiments. Another implication is a maximum pulsar age curve that increases with distance from the galactic center, with a normalization that depends on the couplings and masses of dark sector particles. In addition, we use old pulsars outside the galactic center to place bounds on asymmetric Higgs portal models. |
hep-ph/9506321 | Ed Stoeffhaas | V. Barger, W.-Y. Keung and R.J.N. Phillips | Possible pre-LEP200 SUSY threshold signals | Latex, 9 pages, 5 uufiled postscript figures included. Compressed
postscript file of paper with figures available at
ftp://phenom.physics.wisc.edu/pub/preprints/1995/madph-95-890.ps.Z or at
http://phenom.physics.wisc.edu/pub/preprints/1995/madph-95-890.ps.Z | Phys.Lett.B356:546-552,1995 | 10.1016/0370-2693(95)00829-A | madph-95-890 | hep-ph | null | If $R$-parity is not conserved, the SUSY-threshold production process $e^+e^-
\to \chi_1^0\chi_1^0$ could be detectable with relatively low luminosity. Hence
an interesting mass range for the lightest SUSY particle $\chi_1^0$ could be
explored at the CERN LEP collider during its intermediate energy development,
even before the full LEP200 upgrade is completed. We present cross section
formulas and discuss event rates and detection for the three distinct decay
options: $\chi_1^0\to 2\, {\rm charged \; leptons}\, +\, {\rm neutrino}$,
$\chi_1^0\to {\rm lepton}\, +2\, {\rm quarks}$, and $\chi_1^0\to 3\, {\rm
quarks}$.
| [
{
"created": "Tue, 13 Jun 1995 21:10:36 GMT",
"version": "v1"
}
] | 2009-09-01 | [
[
"Barger",
"V.",
""
],
[
"Keung",
"W. -Y.",
""
],
[
"Phillips",
"R. J. N.",
""
]
] | If $R$-parity is not conserved, the SUSY-threshold production process $e^+e^- \to \chi_1^0\chi_1^0$ could be detectable with relatively low luminosity. Hence an interesting mass range for the lightest SUSY particle $\chi_1^0$ could be explored at the CERN LEP collider during its intermediate energy development, even before the full LEP200 upgrade is completed. We present cross section formulas and discuss event rates and detection for the three distinct decay options: $\chi_1^0\to 2\, {\rm charged \; leptons}\, +\, {\rm neutrino}$, $\chi_1^0\to {\rm lepton}\, +2\, {\rm quarks}$, and $\chi_1^0\to 3\, {\rm quarks}$. |
hep-ph/0406256 | Barbara Mele | Giancarlo Ferrera, Barbara Mele | Associated production of a light Higgs boson and a chargino pair in the
MSSM at linear colliders | 26 pages, 9 figures; figure misplacement fixed; to appear in
Eur.Phys.J.C | Eur.Phys.J.C42:425-436,2005 | 10.1140/epjc/s2005-02337-3 | ROME1-1378/2004; LC-TH-2004-012 | hep-ph | null | In the Minimal Supersymmetric Standard Model (MSSM), we study the light
Higgs-boson radiation off a light-chargino pair in the process e+e- -> h chi^+
chi^- at linear colliders with \sqs=500 GeV. We analyze cross sections in the
regions of the MSSM parameter space where the process can not proceed via
on-shell production and subsequent decay of either heavier charginos or the
pseudoscalar Higgs boson A. Cross sections up to a few fb's are allowed,
according to present experimental limits on the Higgs-boson, chargino and
sneutrino masses. We also show how a measurement of the process production rate
could provide a determination of the Higgs-boson couplings to charginos.
| [
{
"created": "Wed, 23 Jun 2004 13:35:24 GMT",
"version": "v1"
},
{
"created": "Thu, 12 May 2005 11:06:39 GMT",
"version": "v2"
},
{
"created": "Fri, 24 Jun 2005 12:27:01 GMT",
"version": "v3"
}
] | 2009-01-07 | [
[
"Ferrera",
"Giancarlo",
""
],
[
"Mele",
"Barbara",
""
]
] | In the Minimal Supersymmetric Standard Model (MSSM), we study the light Higgs-boson radiation off a light-chargino pair in the process e+e- -> h chi^+ chi^- at linear colliders with \sqs=500 GeV. We analyze cross sections in the regions of the MSSM parameter space where the process can not proceed via on-shell production and subsequent decay of either heavier charginos or the pseudoscalar Higgs boson A. Cross sections up to a few fb's are allowed, according to present experimental limits on the Higgs-boson, chargino and sneutrino masses. We also show how a measurement of the process production rate could provide a determination of the Higgs-boson couplings to charginos. |
hep-ph/9504385 | Kostas | Alberto Sirlin | EVIDENCE FOR ELECTROWEAK CORRECTIONS IN THE STANDARD MODEL | 8 pages of text and 1 figure all included in a uucoded compressed
postscript file. To appear in the proceedings of the Ringberg Workshop on
"Perspectives for electroweak interactions in $e^+e^-$ collisions" hosted by
the Max Planck Institut, at the Ringberg Castle, M\"unich, February 5-8,
1995. Edited by B. Kniehl | null | null | null | hep-ph | null | The phenomenological evidence for electroweak corrections in the Standard
Model, both at very low energies and the $Z^0$ scale, is discussed. In
particular, we review a simple but sharp argument for the presence of
Electroweak Bosonic Corrections.
| [
{
"created": "Mon, 24 Apr 1995 21:15:57 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Sirlin",
"Alberto",
""
]
] | The phenomenological evidence for electroweak corrections in the Standard Model, both at very low energies and the $Z^0$ scale, is discussed. In particular, we review a simple but sharp argument for the presence of Electroweak Bosonic Corrections. |
hep-ph/9707237 | Massimo Scorletti | M. Scorletti | Evolution equations and angular ordering at small x | 10 pages, 4 postscript figures embedded, LaTeX with sprocl.sty and
epsfig.sty. Talk given at the "Conference on Perspectives in Hadronic
Physics", Trieste, 12-16 May 1997 | null | null | IFUM 574-FT | hep-ph | null | This talks examines the effect of angular ordering on the small-x evolution
of the unintegrated gluon distribution, and discusses the characteristic
function for the CCFM equation.
| [
{
"created": "Thu, 3 Jul 1997 13:20:34 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Scorletti",
"M.",
""
]
] | This talks examines the effect of angular ordering on the small-x evolution of the unintegrated gluon distribution, and discusses the characteristic function for the CCFM equation. |
0904.0675 | Eung Jin Chun | E. J. Chun, S. Scopel and I. Zaballa | Gravitational reheating in quintessential inflation | 12 pages, 5 figures | JCAP 0907:022,2009 | 10.1088/1475-7516/2009/07/022 | null | hep-ph astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide a detailed study of gravitational reheating in quintessential
inflation generalizing previous analyses only available for the standard case
when inflation is followed by an era dominated by the energy density of
radiation. Quintessential inflation assumes a common origin for inflation and
the dark energy of the Universe. In this scenario reheating can occur through
gravitational particle production during the inflation-kination transition. We
calculate numerically the amount of the radiation energy density, and determine
the temperature $T_*$ at which radiation starts dominating over kination. The
value of $T_*$ is controlled by the Hubble parameter $H_0$ during inflation and
the transition time $\Delta t$, scaling as $H_0^2 [\ln(1/H_0\Delta t)]^{3/4}$
for $H_0 \Delta t \ll1$ and $H_0^2 (H_0 \Delta t)^{-c}$ for $H_0\Delta t \gg
1$. The model-dependent parameter $c$ is found to be around 0.5 in two
different parametrizations for the transition between inflation and kination.
| [
{
"created": "Sat, 4 Apr 2009 03:03:02 GMT",
"version": "v1"
}
] | 2009-07-22 | [
[
"Chun",
"E. J.",
""
],
[
"Scopel",
"S.",
""
],
[
"Zaballa",
"I.",
""
]
] | We provide a detailed study of gravitational reheating in quintessential inflation generalizing previous analyses only available for the standard case when inflation is followed by an era dominated by the energy density of radiation. Quintessential inflation assumes a common origin for inflation and the dark energy of the Universe. In this scenario reheating can occur through gravitational particle production during the inflation-kination transition. We calculate numerically the amount of the radiation energy density, and determine the temperature $T_*$ at which radiation starts dominating over kination. The value of $T_*$ is controlled by the Hubble parameter $H_0$ during inflation and the transition time $\Delta t$, scaling as $H_0^2 [\ln(1/H_0\Delta t)]^{3/4}$ for $H_0 \Delta t \ll1$ and $H_0^2 (H_0 \Delta t)^{-c}$ for $H_0\Delta t \gg 1$. The model-dependent parameter $c$ is found to be around 0.5 in two different parametrizations for the transition between inflation and kination. |
hep-ph/0005325 | Alessandro Ballestrero | Alessandro Ballestrero | Fermion Loops, conserved currents and single-W | Talk given at the 5th Zeuthen Workshop "Loops and Legs in Quantum
Field Theory" Bastei, April 9-14, 2000. 6 pages. To appear in the proceedings | Nucl.Phys.Proc.Suppl. 89 (2000) 25-30 | 10.1016/S0920-5632(00)00817-3 | null | hep-ph | null | The relevance of fermion loop corrections to four fermion processes at e+ e-
colliders is reviewed with regard to the recent extension to the case of
massive external particles and its application to single-W processes.
| [
{
"created": "Wed, 31 May 2000 16:02:43 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Ballestrero",
"Alessandro",
""
]
] | The relevance of fermion loop corrections to four fermion processes at e+ e- colliders is reviewed with regard to the recent extension to the case of massive external particles and its application to single-W processes. |
2106.13775 | Volodymyr Vovchenko | Volodymyr Vovchenko | Correcting event-by-event fluctuations in heavy-ion collisions for exact
global conservation laws with the generalized subensemble acceptance method | 14 pages, 2 figures, published in Physical Review C | Phys. Rev. C 105, 014903 (2022) | 10.1103/PhysRevC.105.014903 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce the subensemble acceptance method 2.0 (SAM-2.0) -- a procedure
to correct cumulants of a random number distribution inside a subsystem for the
effect of exact global conservation of a conserved quantity to which this
number is correlated, with applications to measurements of event-by-event
fluctuations in heavy-ion collisions. The method expresses the corrected
cumulants in terms of the cumulants inside and outside the subsystem that are
not subject to the exact conservation. The derivation assumes that all
probability distributions associated with the cumulants are peaked at the mean
values but are otherwise of arbitrary shape. The formalism reduces to the
original SAM [V. Vovchenko et al., Phys.Lett.B 811 (2020) 135868
[arXiv:2003.13905]] when applied to a coordinate space subvolume of a uniform
thermal system. As the new method is restricted neither to the uniform systems
nor to the coordinate space, it is applicable to fluctuations measured in
heavy-ion collisions at various collision energies in different momentum space
acceptances. The SAM-2.0 thus brings the experimental measurements and
theoretical calculations of event-by-event fluctuations closer together, as the
latter are typically performed without the account of exact global
conservation.
| [
{
"created": "Fri, 25 Jun 2021 17:22:30 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Jan 2022 19:13:37 GMT",
"version": "v2"
}
] | 2022-01-10 | [
[
"Vovchenko",
"Volodymyr",
""
]
] | We introduce the subensemble acceptance method 2.0 (SAM-2.0) -- a procedure to correct cumulants of a random number distribution inside a subsystem for the effect of exact global conservation of a conserved quantity to which this number is correlated, with applications to measurements of event-by-event fluctuations in heavy-ion collisions. The method expresses the corrected cumulants in terms of the cumulants inside and outside the subsystem that are not subject to the exact conservation. The derivation assumes that all probability distributions associated with the cumulants are peaked at the mean values but are otherwise of arbitrary shape. The formalism reduces to the original SAM [V. Vovchenko et al., Phys.Lett.B 811 (2020) 135868 [arXiv:2003.13905]] when applied to a coordinate space subvolume of a uniform thermal system. As the new method is restricted neither to the uniform systems nor to the coordinate space, it is applicable to fluctuations measured in heavy-ion collisions at various collision energies in different momentum space acceptances. The SAM-2.0 thus brings the experimental measurements and theoretical calculations of event-by-event fluctuations closer together, as the latter are typically performed without the account of exact global conservation. |
hep-ph/9409442 | G. Ecker | G. Ecker and U.-G. Meissner | What is a low-energy theorem ? | 17 pp., Latex, 2 figures included, CRN-94/52, UWThPh-1994-33,
submitted to Comments Nucl. Part. Phys. (no changes at all, but by request of
the E-print Admin. the figures are now in a uuencoded, compressed postscript
file) | Comments Nucl.Part.Phys. 21 (1995) 347-368 | null | null | hep-ph nucl-th | null | We discuss the meaning of low-energy theorems (LETs) in the framework of the
effective field theory of the standard model. Particular emphasis is put on the
LET for neutral pion photoproduction off nucleons at threshold. The seemingly
controversial situation surrounding this LET is clarified.
| [
{
"created": "Thu, 29 Sep 1994 15:18:28 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Sep 1994 12:11:44 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Ecker",
"G.",
""
],
[
"Meissner",
"U. -G.",
""
]
] | We discuss the meaning of low-energy theorems (LETs) in the framework of the effective field theory of the standard model. Particular emphasis is put on the LET for neutral pion photoproduction off nucleons at threshold. The seemingly controversial situation surrounding this LET is clarified. |
2302.12132 | Nikolaos Tetradis | Nikolaos Tetradis (Athens U.) | Exact solutions for Vacuum Decay in Unbounded Potentials | 8 pages, 3 figures, some clarifications added | null | 10.1103/PhysRevD.108.036008 | null | hep-ph gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Standard Model Higgs potential may become unbounded from below at large
field values, with important cosmological implications. For a potential of this
form, the commonly assumed scenario of a nucleated thin-wall bubble driving the
transition from the electroweak vacuum to the unstable region does not apply.
We present exact analytical solutions for potentials that have the same
qualitative form as the Higgs potential. They show that the transition is
driven by a thick-wall spherical bubble of true vacuum, with a surface that
expands at asymptotically the speed of light. A `crunch' singularity appears in
the quasi-AdS interior, with the collapsed region also expanding at
asymptotically the speed of light. The singularity is surrounded by a region of
trapped surfaces whose boundary forms an apparent horizon. An event horizon
separates the singularity from the bubble exterior, so that the expansion of
the bubble surface is not affected by the collapse of the interior. The
solutions provide exact descriptions of the geometry for thick-wall bubbles and
are consistent with the analysis of [1,2] for the Higgs potential.
| [
{
"created": "Thu, 23 Feb 2023 16:15:33 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Jul 2023 13:38:15 GMT",
"version": "v2"
}
] | 2023-08-16 | [
[
"Tetradis",
"Nikolaos",
"",
"Athens U."
]
] | The Standard Model Higgs potential may become unbounded from below at large field values, with important cosmological implications. For a potential of this form, the commonly assumed scenario of a nucleated thin-wall bubble driving the transition from the electroweak vacuum to the unstable region does not apply. We present exact analytical solutions for potentials that have the same qualitative form as the Higgs potential. They show that the transition is driven by a thick-wall spherical bubble of true vacuum, with a surface that expands at asymptotically the speed of light. A `crunch' singularity appears in the quasi-AdS interior, with the collapsed region also expanding at asymptotically the speed of light. The singularity is surrounded by a region of trapped surfaces whose boundary forms an apparent horizon. An event horizon separates the singularity from the bubble exterior, so that the expansion of the bubble surface is not affected by the collapse of the interior. The solutions provide exact descriptions of the geometry for thick-wall bubbles and are consistent with the analysis of [1,2] for the Higgs potential. |
hep-ph/9712205 | J. B. Tausk | J. Franzkowski and J. B. Tausk | O(alpha_s^2) corrections to b -> c decay at zero recoil | Latex, 12 pages, 13 postscript figures included with epsfig | Eur.Phys.J.C5:517-524,1998 | 10.1007/s100520050296 | MZ-TH/97-37, Freiburg-THEP 97/29 | hep-ph | null | Analytic formulae are presented for the two-loop perturbative QCD corrections
to b -> c decay at the zero recoil point, which are required for the extraction
of |V_bc| from measurements of exclusive B -> D* l nu decays. The results are
in agreement with those of Czarnecki and Melnikov. Some comments on the
numerical evaluation of the diagrams involved are made.
| [
{
"created": "Sun, 30 Nov 1997 00:07:21 GMT",
"version": "v1"
}
] | 2011-01-25 | [
[
"Franzkowski",
"J.",
""
],
[
"Tausk",
"J. B.",
""
]
] | Analytic formulae are presented for the two-loop perturbative QCD corrections to b -> c decay at the zero recoil point, which are required for the extraction of |V_bc| from measurements of exclusive B -> D* l nu decays. The results are in agreement with those of Czarnecki and Melnikov. Some comments on the numerical evaluation of the diagrams involved are made. |
hep-ph/0206072 | Luis Anchordoqui | Luis Anchordoqui, Thomas Paul, Stephen Reucroft and John Swain | Ultrahigh Energy Cosmic Rays: The state of the art before the Auger
Observatory | Final version. To be published in Int. J. Mod. Phys. A | Int.J.Mod.Phys.A18:2229-2366,2003 | 10.1142/S0217751X03013879 | NUB-3228/Th-02 | hep-ph astro-ph hep-ex | null | In this review we discuss the important progress made in recent years towards
understanding the experimental data on cosmic rays with energies $\agt 10^{19}$
eV. We begin with a brief survey of the available data, including a description
of the energy spectrum, mass composition, and arrival directions. At this point
we also give a short overview of experimental techniques. After that, we
introduce the fundamentals of acceleration and propagation in order to discuss
the conjectured nearby cosmic ray sources. We then turn to theoretical notions
of physics beyond the Standard Model where we consider both exotic primaries
and exotic physical laws. Particular attention is given to the role that
TeV-scale gravity could play in addressing the origin of the highest energy
cosmic rays. In the final part of the review we discuss the potential of future
cosmic ray experiments for the discovery of tiny black holes that should be
produced in the Earth's atmosphere if TeV-scale gravity is realized in Nature.
| [
{
"created": "Fri, 7 Jun 2002 19:39:02 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Oct 2002 14:02:43 GMT",
"version": "v2"
},
{
"created": "Fri, 6 Dec 2002 16:22:06 GMT",
"version": "v3"
}
] | 2010-01-15 | [
[
"Anchordoqui",
"Luis",
""
],
[
"Paul",
"Thomas",
""
],
[
"Reucroft",
"Stephen",
""
],
[
"Swain",
"John",
""
]
] | In this review we discuss the important progress made in recent years towards understanding the experimental data on cosmic rays with energies $\agt 10^{19}$ eV. We begin with a brief survey of the available data, including a description of the energy spectrum, mass composition, and arrival directions. At this point we also give a short overview of experimental techniques. After that, we introduce the fundamentals of acceleration and propagation in order to discuss the conjectured nearby cosmic ray sources. We then turn to theoretical notions of physics beyond the Standard Model where we consider both exotic primaries and exotic physical laws. Particular attention is given to the role that TeV-scale gravity could play in addressing the origin of the highest energy cosmic rays. In the final part of the review we discuss the potential of future cosmic ray experiments for the discovery of tiny black holes that should be produced in the Earth's atmosphere if TeV-scale gravity is realized in Nature. |
hep-ph/0603017 | Artem Lipatov | A.V. Lipatov, N.P. Zotov | Deep inelastic beauty production at HERA in the kt-factorization
approach | 26 pages, 11 figures, 2 tables | JHEP 0608:043,2006 | 10.1088/1126-6708/2006/08/043 | null | hep-ph | null | We calculate the cross section of beauty production in electron-proton deep
inelastic scattering at HERA collider in the framework of the kt-factorization
approach. The unintegrated gluon distributions in a proton are obtained from
the full CCFM, from unified BFKL-DGLAP evolution equations as well as from the
Kimber-Martin-Ryskin prescription. We investigate different production rates
and study the b-quark contribution to the inclusive proton structure function
F2(x,Q2) at small x and at moderate and high values of Q2. Our theoretical
results are compared with the recent experimental data taken by the H1 and ZEUS
collaborations. We demonstrate the importance of leading ln 1/x contributions
in description of the HERA data.
| [
{
"created": "Thu, 2 Mar 2006 18:09:58 GMT",
"version": "v1"
}
] | 2011-03-23 | [
[
"Lipatov",
"A. V.",
""
],
[
"Zotov",
"N. P.",
""
]
] | We calculate the cross section of beauty production in electron-proton deep inelastic scattering at HERA collider in the framework of the kt-factorization approach. The unintegrated gluon distributions in a proton are obtained from the full CCFM, from unified BFKL-DGLAP evolution equations as well as from the Kimber-Martin-Ryskin prescription. We investigate different production rates and study the b-quark contribution to the inclusive proton structure function F2(x,Q2) at small x and at moderate and high values of Q2. Our theoretical results are compared with the recent experimental data taken by the H1 and ZEUS collaborations. We demonstrate the importance of leading ln 1/x contributions in description of the HERA data. |
0902.1195 | Vladimir Sauli | V. Sauli | Behaviour of propagator and quark confinement | 10 pages, reference added, few typos corrected | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The propagator of confined quarks is calculated for timelike momenta by
transforming Minkowski Greens functions to the Temporal Euclidean space. Based
on the framework of the Schwinger-Dyson equations the QCD quark propagator is
obtained in two approximations which differ by assuming behaviour of gluon
propagator. In both studied cases we get universal result for the light quarks:
The quark mass function becomes complex bellow expected perturbative threshold,
the obtained absolute value of the infrared mass is $M\simeq \Lambda_{QCD} $
with the infrared phase $\simeq {\pi\over 2}$. Permanent confinement of quarks
is maintained by generation of the complex mass function which prevents a real
pole in the propagator. We will show that timelike dynamical Chiral Symmetry
Breaking (CSB) solution is approximately, but non-trivially determined by the
solution of gap equation in the standard Euclidean space.
| [
{
"created": "Fri, 6 Feb 2009 22:58:57 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Feb 2009 17:51:44 GMT",
"version": "v2"
}
] | 2009-02-26 | [
[
"Sauli",
"V.",
""
]
] | The propagator of confined quarks is calculated for timelike momenta by transforming Minkowski Greens functions to the Temporal Euclidean space. Based on the framework of the Schwinger-Dyson equations the QCD quark propagator is obtained in two approximations which differ by assuming behaviour of gluon propagator. In both studied cases we get universal result for the light quarks: The quark mass function becomes complex bellow expected perturbative threshold, the obtained absolute value of the infrared mass is $M\simeq \Lambda_{QCD} $ with the infrared phase $\simeq {\pi\over 2}$. Permanent confinement of quarks is maintained by generation of the complex mass function which prevents a real pole in the propagator. We will show that timelike dynamical Chiral Symmetry Breaking (CSB) solution is approximately, but non-trivially determined by the solution of gap equation in the standard Euclidean space. |
1512.08507 | P. S. Bhupal Dev | P. S. Bhupal Dev, Rabindra N. Mohapatra, Yongchao Zhang | Quark Seesaw, Vectorlike Fermions and Diphoton Excess | 18 pages, 6 figures, 1 table; section on high-scale validity and some
discussions and references added, version to appear in JHEP | JHEP02, 186 (2016) | 10.1007/JHEP02(2016)186 | ULB-TH/15-26 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a possible interpretation of the recent diphoton excess reported
by the $\sqrt s=13$ TeV LHC data in quark seesaw left-right models with
vectorlike fermions proposed to solve the strong $CP$ problem without the
axion. The gauge singlet real scalar field responsible for the mass of the
vectorlike fermions has the right production cross section and diphoton
branching ratio to be identifiable with the reported excess at around 750 GeV
diphoton invariant mass. Various ways to test this hypothesis as more data
accumulates at the LHC are proposed.
| [
{
"created": "Mon, 28 Dec 2015 20:46:53 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Dec 2015 20:47:32 GMT",
"version": "v2"
},
{
"created": "Mon, 15 Feb 2016 17:49:21 GMT",
"version": "v3"
}
] | 2016-03-04 | [
[
"Dev",
"P. S. Bhupal",
""
],
[
"Mohapatra",
"Rabindra N.",
""
],
[
"Zhang",
"Yongchao",
""
]
] | We present a possible interpretation of the recent diphoton excess reported by the $\sqrt s=13$ TeV LHC data in quark seesaw left-right models with vectorlike fermions proposed to solve the strong $CP$ problem without the axion. The gauge singlet real scalar field responsible for the mass of the vectorlike fermions has the right production cross section and diphoton branching ratio to be identifiable with the reported excess at around 750 GeV diphoton invariant mass. Various ways to test this hypothesis as more data accumulates at the LHC are proposed. |
hep-ph/0411021 | Ian G. Moss | Cheng-Ji Chang and I. G. Moss | Brane inflation with dark reheating | 4 pages, ReVTeX | Phys.Lett. B607 (2005) 214-218 | 10.1016/j.physletb.2004.12.060 | null | hep-ph | null | In brane world scenarios inflationary vacuum energy may escape into the
higher dimensional bulk leaving behind a dark radiation effect on the brane.
The paper analyses the damping of an inflaton by massless bulk scalar radiation
and the production of dark radiation in a Randall-Sundrum type of model.
| [
{
"created": "Mon, 1 Nov 2004 16:51:00 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Chang",
"Cheng-Ji",
""
],
[
"Moss",
"I. G.",
""
]
] | In brane world scenarios inflationary vacuum energy may escape into the higher dimensional bulk leaving behind a dark radiation effect on the brane. The paper analyses the damping of an inflaton by massless bulk scalar radiation and the production of dark radiation in a Randall-Sundrum type of model. |
1609.00844 | John M. Campbell | John M. Campbell | Theory overview of electroweak physics at hadron colliders | Talk presented at Fourth Annual Large Hadron Collider Physics
conference (LHCP2016), 13-18 June 2016, Lund, Sweden (19 pages) | null | null | FERMILAB-CONF-16-336-T | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This contribution summarizes some of the important theoretical progress that
has been made in the arena of electroweak physics at hadron colliders. The
focus is on developments that have sharpened theoretical predictions for final
states produced through electroweak processes. Special attention is paid to new
results that have been presented in the last year, since LHCP2015, as well as
on key issues for future measurements at the LHC.
| [
{
"created": "Sat, 3 Sep 2016 17:26:45 GMT",
"version": "v1"
}
] | 2016-09-06 | [
[
"Campbell",
"John M.",
""
]
] | This contribution summarizes some of the important theoretical progress that has been made in the arena of electroweak physics at hadron colliders. The focus is on developments that have sharpened theoretical predictions for final states produced through electroweak processes. Special attention is paid to new results that have been presented in the last year, since LHCP2015, as well as on key issues for future measurements at the LHC. |
2008.00173 | Shuai Xu | Shuai Xu and Sibo Zheng | Identifying Minimal Composite Dark Matter | null | null | 10.1007/s10773-023-05352-6 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We attempt to identify the minimal composite scalar dark matter from strong
dynamics with the characteristic mass of order TeV scale. We provide both
direct and indirect limits from dark matter direct detections and collider
facilities. Compared to a fundamental scalar dark matter, our results show that
in the composite scalar dark matter the disappearing resonant mass region, the
smaller spin-independent dark matter-nucleon scattering cross section in
certain mass region, and the absence at the HL-LHC illustrate how to
differentiate these two dark matter models.
| [
{
"created": "Sat, 1 Aug 2020 05:18:10 GMT",
"version": "v1"
},
{
"created": "Sat, 8 May 2021 01:41:08 GMT",
"version": "v2"
},
{
"created": "Sun, 31 Jul 2022 03:14:49 GMT",
"version": "v3"
}
] | 2023-05-16 | [
[
"Xu",
"Shuai",
""
],
[
"Zheng",
"Sibo",
""
]
] | We attempt to identify the minimal composite scalar dark matter from strong dynamics with the characteristic mass of order TeV scale. We provide both direct and indirect limits from dark matter direct detections and collider facilities. Compared to a fundamental scalar dark matter, our results show that in the composite scalar dark matter the disappearing resonant mass region, the smaller spin-independent dark matter-nucleon scattering cross section in certain mass region, and the absence at the HL-LHC illustrate how to differentiate these two dark matter models. |
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