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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1609.08895 | Dennis Loose | Gudrun Hiller, Dennis Loose, Kay Sch\"onwald | Leptoquark Flavor Patterns & B Decay Anomalies | 23 pages plus references and appendices, 2 figures, v2: typos fixed,
clarifications and references added; conclusions unchanged | null | 10.1007/JHEP12(2016)027 | DO-TH 16/17 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Flavor symmetries that explain masses and mixings of the standard model
fermions dictate flavor patterns for the couplings of scalar and vector
leptoquarks to the standard model fermions. A generic feature is that couplings
to $SU(2)$-doublet leptons are suppressed at least by one spurion of the
discrete non-abelian symmetry breaking, responsible for neutrino mixing, while
couplings to charged lepton singlets can be order one. We obtain testable
patterns including those that predominantly couple to a single lepton flavor,
or two, or in a skewed way. They induce lepton non-universality, which we
contrast to current anomalies in $B$-decays. We find maximal effects in $R_{D}$
and $R_{D^*}$ at the level of $\sim$10 percent and few percent, respectively,
while leptoquark effects in $R_{K^{(*)}}$ can reach order few$\times 10$
percent. Predictions for charm and kaon decays and $\mu-e$ conversion are
worked out.
| [
{
"created": "Wed, 28 Sep 2016 12:56:53 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Dec 2016 13:59:01 GMT",
"version": "v2"
}
] | 2017-01-04 | [
[
"Hiller",
"Gudrun",
""
],
[
"Loose",
"Dennis",
""
],
[
"Schönwald",
"Kay",
""
]
] | Flavor symmetries that explain masses and mixings of the standard model fermions dictate flavor patterns for the couplings of scalar and vector leptoquarks to the standard model fermions. A generic feature is that couplings to $SU(2)$-doublet leptons are suppressed at least by one spurion of the discrete non-abelian symmetry breaking, responsible for neutrino mixing, while couplings to charged lepton singlets can be order one. We obtain testable patterns including those that predominantly couple to a single lepton flavor, or two, or in a skewed way. They induce lepton non-universality, which we contrast to current anomalies in $B$-decays. We find maximal effects in $R_{D}$ and $R_{D^*}$ at the level of $\sim$10 percent and few percent, respectively, while leptoquark effects in $R_{K^{(*)}}$ can reach order few$\times 10$ percent. Predictions for charm and kaon decays and $\mu-e$ conversion are worked out. |
2103.14611 | Azadeh Maleknejad | Azadeh Maleknejad | Chiral Anomaly in SU(2)${}_R$-Axion Inflation and the New Prediction for
Particle Cosmology | 28+20 Pages, 15 Figs | J. High Energ. Phys. 2021, 113 (2021) | 10.1007/JHEP06(2021)113 | CERN-TH-2021-034 | hep-ph astro-ph.CO gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Upon embedding the axion-inflation in the minimal left-right symmetric gauge
extension of the SM with gauge group $SU(2)_L\times SU(2)_R \times U(1)_{B-L}$,
[arXiv:2012.11516] proposed a new particle physics model for inflation. In this
work, we present a more detailed analysis. As a compelling consequence, this
setup provides a new mechanism for simultaneous baryogenesis and right-handed
neutrino creation by the chiral anomaly of $W_R$ in inflation. The lightest
right-handed neutrino is the dark matter candidate. This setup has two unknown
fundamental scales, i.e., the scale of inflation and left-right symmetry
breaking $SU(2)_R\times U(1)_{B-L}\rightarrow U(1)_{Y}$. Sufficient matter
creation demands the left-right symmetry breaking scale happens shortly after
the end of inflation. Interestingly, it prefers left-right symmetry breaking
scales above $10^{10}~GeV$, which is in the range suggested by the
non-supersymmetric SO(10) Grand Unified Theory with an intermediate left-right
symmetry scale. Although $W_R$ gauge field generates equal amounts of
right-handed baryons and leptons in inflation, i.e. $B-L=0$, in the Standard
Model sub-sector $B-L_{SM}\neq 0$. A key aspect of this setup is that $SU(2)_R$
sphalerons are never in equilibrium, and the primordial $B-L_{SM}$ is conserved
by the Standard Model interactions. This setup yields a deep connection between
CP violation in physics of inflation and matter creation (visible and dark);
hence it can naturally explain the observed coincidences among cosmological
parameters, i.e., $\eta_{B}\simeq 0.3 P_{\zeta}$ and $\Omega_{DM}\simeq
5\Omega_{B}$. The $SU(2)_R$-axion inflation comes with a cosmological smoking
gun; chiral, non-Gaussian, and blue-tilted gravitational wave background, which
can be probed by future CMB missions and laser interferometer detectors.
| [
{
"created": "Fri, 26 Mar 2021 17:27:55 GMT",
"version": "v1"
}
] | 2021-10-26 | [
[
"Maleknejad",
"Azadeh",
""
]
] | Upon embedding the axion-inflation in the minimal left-right symmetric gauge extension of the SM with gauge group $SU(2)_L\times SU(2)_R \times U(1)_{B-L}$, [arXiv:2012.11516] proposed a new particle physics model for inflation. In this work, we present a more detailed analysis. As a compelling consequence, this setup provides a new mechanism for simultaneous baryogenesis and right-handed neutrino creation by the chiral anomaly of $W_R$ in inflation. The lightest right-handed neutrino is the dark matter candidate. This setup has two unknown fundamental scales, i.e., the scale of inflation and left-right symmetry breaking $SU(2)_R\times U(1)_{B-L}\rightarrow U(1)_{Y}$. Sufficient matter creation demands the left-right symmetry breaking scale happens shortly after the end of inflation. Interestingly, it prefers left-right symmetry breaking scales above $10^{10}~GeV$, which is in the range suggested by the non-supersymmetric SO(10) Grand Unified Theory with an intermediate left-right symmetry scale. Although $W_R$ gauge field generates equal amounts of right-handed baryons and leptons in inflation, i.e. $B-L=0$, in the Standard Model sub-sector $B-L_{SM}\neq 0$. A key aspect of this setup is that $SU(2)_R$ sphalerons are never in equilibrium, and the primordial $B-L_{SM}$ is conserved by the Standard Model interactions. This setup yields a deep connection between CP violation in physics of inflation and matter creation (visible and dark); hence it can naturally explain the observed coincidences among cosmological parameters, i.e., $\eta_{B}\simeq 0.3 P_{\zeta}$ and $\Omega_{DM}\simeq 5\Omega_{B}$. The $SU(2)_R$-axion inflation comes with a cosmological smoking gun; chiral, non-Gaussian, and blue-tilted gravitational wave background, which can be probed by future CMB missions and laser interferometer detectors. |
1604.05728 | Adam Martin | Adam Martin, Tuhin S. Roy | A Cautionary Tale of Mis-measured Tails from $q/g$ Bias | 20 pages, 10 figures. Version published in Phys. Rev. D | Phys. Rev. D 94, 014003 (2016) | 10.1103/PhysRevD.94.014003 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Jet substructure techniques such as subjet $p_T$-asymmetry, mass-drop, and
grooming have become powerful and widely used tools in experimental searches at
the LHC. While these tools provide much-desired handles to separate signal from
background, they can introduce unexpected mass scales into the analysis. These
scales may be misinterpreted as excesses if these are not correctly
incorporated into background modeling. As an example, we study the ATLAS
hadronic di-$W/Z$ resonance search. There, we find that the substructure
analysis -- in particular the combination of a subjet asymmetry cut with the
requirement on the number of tracks within a jet -- induces a mass scale where
the dominant partonic subprocess in the background changes from $pp \to g \!+\!
q/\bar q$ to $pp \to q\bar{q}$. In light of this scale, modeling the QCD
background using a simple smooth function with monotonically decreasing slope
appears insufficient.
| [
{
"created": "Tue, 19 Apr 2016 20:00:36 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Jul 2016 23:48:45 GMT",
"version": "v2"
}
] | 2016-07-19 | [
[
"Martin",
"Adam",
""
],
[
"Roy",
"Tuhin S.",
""
]
] | Jet substructure techniques such as subjet $p_T$-asymmetry, mass-drop, and grooming have become powerful and widely used tools in experimental searches at the LHC. While these tools provide much-desired handles to separate signal from background, they can introduce unexpected mass scales into the analysis. These scales may be misinterpreted as excesses if these are not correctly incorporated into background modeling. As an example, we study the ATLAS hadronic di-$W/Z$ resonance search. There, we find that the substructure analysis -- in particular the combination of a subjet asymmetry cut with the requirement on the number of tracks within a jet -- induces a mass scale where the dominant partonic subprocess in the background changes from $pp \to g \!+\! q/\bar q$ to $pp \to q\bar{q}$. In light of this scale, modeling the QCD background using a simple smooth function with monotonically decreasing slope appears insufficient. |
2104.11155 | Moha Ouali | M. Ouhammou, M. Ouali, S. Taj, and B. Manaut | Higgs-strahlung boson production in the presence of a circularly
polarized laser field | 17 pages, 11 figures | Laser Phys. Lett. 18 (2021) 076002 | 10.1088/1612-202X/ac0919 | null | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | In the framework of the electroweak standard model, we investigated, in the
center of mass frame, the Higgs boson production in the presence of an intense
laser field via ${e}^{+} {e}^{-}$ annihilation $({e}^{+} {e}^{-}\rightarrow
ZH)$. By comparing our results with those obtained by Djouadi \cite{1} for
laser-free process, we show that the circularly polarized laser field affects
significantly the $s$-channel Higgs boson production. We find that for a given
number of exchanged photons, laser field strength and frequency, the total
cross section decreases by several orders of magnitude. These effects of laser
field on cross section are found to be consistent with what was found for muon
pair production via QED process in the presence of a circularly polarized laser
field \cite{2}.
| [
{
"created": "Wed, 21 Apr 2021 14:13:24 GMT",
"version": "v1"
}
] | 2021-07-02 | [
[
"Ouhammou",
"M.",
""
],
[
"Ouali",
"M.",
""
],
[
"Taj",
"S.",
""
],
[
"Manaut",
"B.",
""
]
] | In the framework of the electroweak standard model, we investigated, in the center of mass frame, the Higgs boson production in the presence of an intense laser field via ${e}^{+} {e}^{-}$ annihilation $({e}^{+} {e}^{-}\rightarrow ZH)$. By comparing our results with those obtained by Djouadi \cite{1} for laser-free process, we show that the circularly polarized laser field affects significantly the $s$-channel Higgs boson production. We find that for a given number of exchanged photons, laser field strength and frequency, the total cross section decreases by several orders of magnitude. These effects of laser field on cross section are found to be consistent with what was found for muon pair production via QED process in the presence of a circularly polarized laser field \cite{2}. |
0803.2992 | German Rodrigo | German Rodrigo | Axigluon signatures at hadron colliders | Presented at 8th International Symposium on Radiative Corrections
(RADCOR07), 1-5 October 2007, Florence, Italy | PoSRADCOR2007:010,2007 | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Axigluons are colored heavy neutral gauge boson that are predicted by some
theories. The most important model-independent manifestation of axigluons is
the generation of a forward--backward asymmetry in top-antitop quark production
at $p\bar{p}$ collisions which originates from the charge asymmetry. We update
our previous analysis for the inclusive QCD induced forward--backward asymmetry
and define a new observable which is more sensitive to the effect than the
forward--backward asymmetry. We find a lower limit of 1.4 TeV at 90% C.L. on
the axigluon mass from recent measurements of the asymmetry at Tevatron, and
extend the analysis to LHC in suitably selected samples. Like at Tevatron, the
charge asymmetry can probe larger values of the axigluon mass than the dijet
mass distribution.
| [
{
"created": "Thu, 20 Mar 2008 13:09:50 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Rodrigo",
"German",
""
]
] | Axigluons are colored heavy neutral gauge boson that are predicted by some theories. The most important model-independent manifestation of axigluons is the generation of a forward--backward asymmetry in top-antitop quark production at $p\bar{p}$ collisions which originates from the charge asymmetry. We update our previous analysis for the inclusive QCD induced forward--backward asymmetry and define a new observable which is more sensitive to the effect than the forward--backward asymmetry. We find a lower limit of 1.4 TeV at 90% C.L. on the axigluon mass from recent measurements of the asymmetry at Tevatron, and extend the analysis to LHC in suitably selected samples. Like at Tevatron, the charge asymmetry can probe larger values of the axigluon mass than the dijet mass distribution. |
2407.21100 | Marco Ardu | Marco Ardu, Moinul Hossain Rahat, Nicola Valori and Oscar Vives | Electric Dipole Moments as indirect probes of Dark Sectors | 18 Pages + Appendices. Comments welcome! | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Dark sectors provide beyond Standard Model scenarios which can address
unresolved puzzles, such as the observed dark matter abundance or the baryon
asymmetry of the Universe. A naturally small portal to the dark sector is
obtained if dark-sector interactions stem from a non-Abelian hidden gauge group
that couples through kinetic mixing with the hypercharge boson. In this work,
we investigate the phenomenology of such a portal of dimension five in the
presence of CP violation, focusing on its signatures in fermion electric dipole
moments. We show that, currently unbounded regions of the parameter space from
dark photon searches can be indirectly probed with upcoming electron dipole
moment experiments for dark boson masses in the range $1-100$ GeV. We also
discuss two particular scenarios where a $SU(2)_D$ dark gauge group
spontaneously breaks into either an Abelian $U(1)_D$ or nothing. In both cases,
we show that potentially observable electron dipole moments can be produced in
vast regions of the parameter space compatible with current experimental
constraints and observed dark matter abundance.
| [
{
"created": "Tue, 30 Jul 2024 18:00:01 GMT",
"version": "v1"
}
] | 2024-08-01 | [
[
"Ardu",
"Marco",
""
],
[
"Rahat",
"Moinul Hossain",
""
],
[
"Valori",
"Nicola",
""
],
[
"Vives",
"Oscar",
""
]
] | Dark sectors provide beyond Standard Model scenarios which can address unresolved puzzles, such as the observed dark matter abundance or the baryon asymmetry of the Universe. A naturally small portal to the dark sector is obtained if dark-sector interactions stem from a non-Abelian hidden gauge group that couples through kinetic mixing with the hypercharge boson. In this work, we investigate the phenomenology of such a portal of dimension five in the presence of CP violation, focusing on its signatures in fermion electric dipole moments. We show that, currently unbounded regions of the parameter space from dark photon searches can be indirectly probed with upcoming electron dipole moment experiments for dark boson masses in the range $1-100$ GeV. We also discuss two particular scenarios where a $SU(2)_D$ dark gauge group spontaneously breaks into either an Abelian $U(1)_D$ or nothing. In both cases, we show that potentially observable electron dipole moments can be produced in vast regions of the parameter space compatible with current experimental constraints and observed dark matter abundance. |
0909.1337 | Ivo de Medeiros Varzielas | Ivo de Medeiros Varzielas | Neutrino Mixing in Unified Extended Seesaw Model | Proceedings submission for SUSY09, 4 pages, 1 figure | AIP Conf.Proc.1200:944-947,2010 | 10.1063/1.3327770 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The seesaw mechanism can play a key role in the generation of the leptonic
mixing in unified models. We consider an unified model with a family symmetry
and extended seesaw, and obtain viable fermion masses and mixing (leptonic
mixing is close to tri-bi-maximal).
| [
{
"created": "Tue, 8 Sep 2009 14:37:19 GMT",
"version": "v1"
}
] | 2015-05-14 | [
[
"Varzielas",
"Ivo de Medeiros",
""
]
] | The seesaw mechanism can play a key role in the generation of the leptonic mixing in unified models. We consider an unified model with a family symmetry and extended seesaw, and obtain viable fermion masses and mixing (leptonic mixing is close to tri-bi-maximal). |
hep-ph/0602229 | Andreas Karch | Andreas Karch, Emanuel Katz, Dam T. Son, Mikhail A. Stephanov | Linear Confinement and AdS/QCD | 14 pages, 1 figure | Phys.Rev.D74:015005,2006 | 10.1103/PhysRevD.74.015005 | BUHEP-06-02, INT-PUB 06-04 | hep-ph hep-th | null | In a theory with linear confinement, such as QCD, the masses squared m^2 of
mesons with high spin S or high radial excitation number n are expected, from
semiclassical arguments, to grow linearly with S and n. We show that this
behavior can be reproduced within a putative 5-dimensional theory
holographically dual to QCD (AdS/QCD). With the assumption that such a dual
theory exists and describes highly excited mesons as well, we show that
asymptotically linear m^2 spectrum translates into a strong constraint on the
INFRARED behavior of that theory. In the simplest model which obeys such a
constraint we find m^2 ~ (n+S).
| [
{
"created": "Sun, 26 Feb 2006 06:22:55 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Jul 2006 01:12:33 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Karch",
"Andreas",
""
],
[
"Katz",
"Emanuel",
""
],
[
"Son",
"Dam T.",
""
],
[
"Stephanov",
"Mikhail A.",
""
]
] | In a theory with linear confinement, such as QCD, the masses squared m^2 of mesons with high spin S or high radial excitation number n are expected, from semiclassical arguments, to grow linearly with S and n. We show that this behavior can be reproduced within a putative 5-dimensional theory holographically dual to QCD (AdS/QCD). With the assumption that such a dual theory exists and describes highly excited mesons as well, we show that asymptotically linear m^2 spectrum translates into a strong constraint on the INFRARED behavior of that theory. In the simplest model which obeys such a constraint we find m^2 ~ (n+S). |
hep-ph/9502356 | null | K. Goulianos (The Rockefeller University) | POMERON FLUX RENORMALIZATION IN SOFT AND HARD DIFFRACTION | 14 pages, 3 EPS figures tarred, compressed, uuencoded | Phys.Lett.B358:379-388,1995; Erratum-ibid.B363:268,1995 | 10.1016/0370-2693(95)01023-J | RU-95/E-06 | hep-ph | null | While the main features of elastic, diffractive and total cross sections are
described well by Regge theory, the measured rise of the proton-(anti)proton
single diffraction dissociation cross section with energy is considerably
smaller than the theoretical prediction based on factorization and a constant
triple-pomeron coupling. The observed energy dependence is obtained by
renormalizing the pomeron flux "carried" by a nucleon to unity. Double
diffraction and double pomeron exchange cross sections are reevaluated and
compared to data, and a new interpretation of hard diffraction results emerges
in which the hard pomeron obeys the momentum sum rule.
| [
{
"created": "Mon, 20 Feb 1995 22:47:24 GMT",
"version": "v1"
}
] | 2010-05-12 | [
[
"Goulianos",
"K.",
"",
"The Rockefeller University"
]
] | While the main features of elastic, diffractive and total cross sections are described well by Regge theory, the measured rise of the proton-(anti)proton single diffraction dissociation cross section with energy is considerably smaller than the theoretical prediction based on factorization and a constant triple-pomeron coupling. The observed energy dependence is obtained by renormalizing the pomeron flux "carried" by a nucleon to unity. Double diffraction and double pomeron exchange cross sections are reevaluated and compared to data, and a new interpretation of hard diffraction results emerges in which the hard pomeron obeys the momentum sum rule. |
2005.01842 | Raghav Kunnawalkam Elayavalli | Jana Biel\v{c}\'ikov\'a, Raghav Kunnawalkam Elayavalli, Georgy
Ponimatkin, J\"orn H. Putschke and Josef Sivic | Identifying Heavy-Flavor Jets Using Vectors of Locally Aggregated
Descriptors | 18 pages, 6 figures and 3 tables. Accepted by JINST | null | 10.1088/1748-0221/16/03/P03017 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Jets of collimated particles serve a multitude of purposes in high energy
collisions. Recently, studies of jet interaction with the quark-gluon plasma
(QGP) created in high energy heavy ion collisions are of growing interest,
particularly towards understanding partonic energy loss in the QGP medium and
its related modifications of the jet shower and fragmentation. Since the QGP is
a colored medium, the extent of jet quenching and consequently, the transport
properties of the medium are expected to be sensitive to fundamental properties
of the jets such as the flavor of the parton that initiates the jet.
Identifying the jet flavor enables an extraction of the mass dependence in
jet-QGP interactions. We present a novel approach to tagging heavy-flavor jets
at collider experiments utilizing the information contained within jet
constituents via the \texttt{JetVLAD} model architecture. We show the
performance of this model in proton-proton collisions at center of mass energy
$\sqrt{s} = 200$ GeV as characterized by common metrics and showcase its
ability to extract high purity heavy-flavor jet sample at various jet momenta
and realistic production cross-sections including a brief discussion on the
impact of out-of-time pile-up. Such studies open new opportunities for future
high purity heavy-flavor measurements at jet energies accessible at current and
future collider experiments.
| [
{
"created": "Mon, 4 May 2020 20:48:35 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Jun 2020 19:58:31 GMT",
"version": "v2"
},
{
"created": "Thu, 27 Aug 2020 17:56:37 GMT",
"version": "v3"
},
{
"created": "Thu, 7 Jan 2021 15:59:41 GMT",
"version": "v4"
}
] | 2021-03-24 | [
[
"Bielčíková",
"Jana",
""
],
[
"Elayavalli",
"Raghav Kunnawalkam",
""
],
[
"Ponimatkin",
"Georgy",
""
],
[
"Putschke",
"Jörn H.",
""
],
[
"Sivic",
"Josef",
""
]
] | Jets of collimated particles serve a multitude of purposes in high energy collisions. Recently, studies of jet interaction with the quark-gluon plasma (QGP) created in high energy heavy ion collisions are of growing interest, particularly towards understanding partonic energy loss in the QGP medium and its related modifications of the jet shower and fragmentation. Since the QGP is a colored medium, the extent of jet quenching and consequently, the transport properties of the medium are expected to be sensitive to fundamental properties of the jets such as the flavor of the parton that initiates the jet. Identifying the jet flavor enables an extraction of the mass dependence in jet-QGP interactions. We present a novel approach to tagging heavy-flavor jets at collider experiments utilizing the information contained within jet constituents via the \texttt{JetVLAD} model architecture. We show the performance of this model in proton-proton collisions at center of mass energy $\sqrt{s} = 200$ GeV as characterized by common metrics and showcase its ability to extract high purity heavy-flavor jet sample at various jet momenta and realistic production cross-sections including a brief discussion on the impact of out-of-time pile-up. Such studies open new opportunities for future high purity heavy-flavor measurements at jet energies accessible at current and future collider experiments. |
hep-ph/0411300 | Bernd Kniehl | B.A. Kniehl, G. Kramer, M. Maniatis | Inclusive Production of Single Hadrons with Finite Transverse Momenta in
Deep-Inelastic Scattering at Next-to-Leading Order | 26 pages, 12 figures | Nucl.Phys.B711:345-366,2005; Erratum-ibid.B720:231,2005 | 10.1016/j.nuclphysb.2005.01.031 10.1016/j.nuclphysb.2005.05.017 | DESY 04-224 | hep-ph hep-ex | null | We calculate the cross section for the inclusive production of single hadrons
with finite transverse momenta in deep-inelastic scattering at next-to-leading
order (NLO), i.e. through O(alpha_s^2), in the parton model of QCD endowed with
non-perturbative parton distribution functions (PDFs) and fragmentation
functions (FFs). The NLO correction is found to produce a sizeable enhancement
in cross section, of up to one order of magnitude, bringing the theoretical
prediction to good agreement with recent measurements for neutral pions and
charged hadrons at DESY HERA. This provides a useful test for the universality
and the scaling violations of the FFs predicted by the factorization theorem.
Such comparisons can also be used to constrain the gluon PDF of the proton.
| [
{
"created": "Mon, 22 Nov 2004 20:34:28 GMT",
"version": "v1"
}
] | 2010-11-05 | [
[
"Kniehl",
"B. A.",
""
],
[
"Kramer",
"G.",
""
],
[
"Maniatis",
"M.",
""
]
] | We calculate the cross section for the inclusive production of single hadrons with finite transverse momenta in deep-inelastic scattering at next-to-leading order (NLO), i.e. through O(alpha_s^2), in the parton model of QCD endowed with non-perturbative parton distribution functions (PDFs) and fragmentation functions (FFs). The NLO correction is found to produce a sizeable enhancement in cross section, of up to one order of magnitude, bringing the theoretical prediction to good agreement with recent measurements for neutral pions and charged hadrons at DESY HERA. This provides a useful test for the universality and the scaling violations of the FFs predicted by the factorization theorem. Such comparisons can also be used to constrain the gluon PDF of the proton. |
0810.1104 | Sandy S. C. Law | Xiao-Gang He, Sandy S. C. Law, Raymond R. Volkas | Determining the heavy seesaw neutrino mass matrix from low-energy
parameters | 19 pages, 7 figures; v2: typos corrected, new ref. added; v3:added
discussion and references, this version accepted by PRD | Phys.Rev.D78:113001,2008 | 10.1103/PhysRevD.78.113001 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore how the seesaw sector in neutrino mass models may be constrained
through symmetries to be completely determined in terms of low-energy mass,
mixing angle and CP-violating phase observables. The key ingredients are
intra-family symmetries to determine the neutrino Dirac mass matrix in terms of
the charged-lepton or quark mass matrices, together with inter-family or flavor
symmetries to determine diagonalization matrices. Implications for leptogenesis
and collider detection of heavy neutral leptons are discussed. We show that
leptogenesis can succeed in small regions of parameter space for the case where
the neutrino Dirac mass matrix equals the up-quark mass matrix. The model where
the neutrino Dirac mass matrix equals the charged-lepton mass matrix can yield
a heavy neutral lepton as light as about 1 TeV, but detecting such a particle
will be difficult.
| [
{
"created": "Tue, 7 Oct 2008 06:56:24 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Oct 2008 01:53:46 GMT",
"version": "v2"
},
{
"created": "Thu, 13 Nov 2008 00:13:34 GMT",
"version": "v3"
}
] | 2010-04-15 | [
[
"He",
"Xiao-Gang",
""
],
[
"Law",
"Sandy S. C.",
""
],
[
"Volkas",
"Raymond R.",
""
]
] | We explore how the seesaw sector in neutrino mass models may be constrained through symmetries to be completely determined in terms of low-energy mass, mixing angle and CP-violating phase observables. The key ingredients are intra-family symmetries to determine the neutrino Dirac mass matrix in terms of the charged-lepton or quark mass matrices, together with inter-family or flavor symmetries to determine diagonalization matrices. Implications for leptogenesis and collider detection of heavy neutral leptons are discussed. We show that leptogenesis can succeed in small regions of parameter space for the case where the neutrino Dirac mass matrix equals the up-quark mass matrix. The model where the neutrino Dirac mass matrix equals the charged-lepton mass matrix can yield a heavy neutral lepton as light as about 1 TeV, but detecting such a particle will be difficult. |
0912.4094 | HongWei Ke | Hong-Wei Ke, Xue-Qian Li and Zheng-Tao Wei | Determining the $\eta-\eta'$ mixing by the newly measured
$BR(D(D_s)\to\eta(\eta')+\bar l+\nu_l$ | 11 pages and 3 figures, some changes were made. Accepted by EPJC | Eur.Phys.J.C69:133-138,2010 | 10.1140/epjc/s10052-010-1383-6 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The mixing of $\eta-\eta'$ or $\eta-\eta'-G$ is of a great theoretical
interest, because it concerns many aspects of the underlying dynamics and
hadronic structure of pseudoscalar mesons and glueball. Determining the mixing
parameters by fitting data is by no means trivial. In order to extract the
mixing parameters from the available processes where hadrons are involved,
theoretical evaluation of hadronic matrix elements is necessary. Therefore
model-dependence is somehow unavoidable. In fact, it is impossible to extract
the mixing angle from a unique experiment because the model parameters must be
obtained by fitting other experiments. Recently $BR(D\to\eta+\bar l+\nu_l)$ and
$BR(D_s\to\eta(\eta')+\bar l+\nu_l)$ have been measured, thus we are able to
determine the $\eta-\eta'$ mixing solely from the semileptonic decays of
D-mesons where contamination from the final state interactions is absent. Thus
we hope that the model-dependence of the extraction can be somehow alleviated.
Once $BR(D\to\eta'+\bar l+\nu_l)$ is measured, we can further determine all the
mixing parameters for $\eta-\eta'-G$. As more data are accumulated, the
determination will be more accurate. In this work, we obtain the transition
matrix elements of $D_{(s)}\to \eta^{(\prime)}$ using the light-front quark
model whose feasibility and reasonability for such processes have been tested.
| [
{
"created": "Mon, 21 Dec 2009 08:08:14 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Jun 2010 01:30:10 GMT",
"version": "v2"
}
] | 2011-02-09 | [
[
"Ke",
"Hong-Wei",
""
],
[
"Li",
"Xue-Qian",
""
],
[
"Wei",
"Zheng-Tao",
""
]
] | The mixing of $\eta-\eta'$ or $\eta-\eta'-G$ is of a great theoretical interest, because it concerns many aspects of the underlying dynamics and hadronic structure of pseudoscalar mesons and glueball. Determining the mixing parameters by fitting data is by no means trivial. In order to extract the mixing parameters from the available processes where hadrons are involved, theoretical evaluation of hadronic matrix elements is necessary. Therefore model-dependence is somehow unavoidable. In fact, it is impossible to extract the mixing angle from a unique experiment because the model parameters must be obtained by fitting other experiments. Recently $BR(D\to\eta+\bar l+\nu_l)$ and $BR(D_s\to\eta(\eta')+\bar l+\nu_l)$ have been measured, thus we are able to determine the $\eta-\eta'$ mixing solely from the semileptonic decays of D-mesons where contamination from the final state interactions is absent. Thus we hope that the model-dependence of the extraction can be somehow alleviated. Once $BR(D\to\eta'+\bar l+\nu_l)$ is measured, we can further determine all the mixing parameters for $\eta-\eta'-G$. As more data are accumulated, the determination will be more accurate. In this work, we obtain the transition matrix elements of $D_{(s)}\to \eta^{(\prime)}$ using the light-front quark model whose feasibility and reasonability for such processes have been tested. |
hep-ph/0008243 | Xavier Calmet | Xavier Calmet, Harald Fritzsch (Munich U.) | The Electroweak Interactions as a Confinement Phenomenon | 15 pages, 1 figure, to appear in Physics Letters B | Phys.Lett. B496 (2000) 161-168 | 10.1016/S0370-2693(00)01299-5 | LMU 10/00 | hep-ph hep-th | null | We consider a model for the electroweak interactions based on the assumption
that physical particles are singlets under the gauge group SU(2). The concept
of complementarity explains why the standard model works with such an
extraordinary precision although the fermions and bosons of the model can be
viewed as composite objects of some more fundamental fermions and bosons. We
study the incorporation of QED in the model. Furthermore we consider possible
deviations from the standard model at very high energies, e.g. excited states
of the weak bosons.
| [
{
"created": "Wed, 23 Aug 2000 12:25:51 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Nov 2000 10:15:32 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Calmet",
"Xavier",
"",
"Munich U."
],
[
"Fritzsch",
"Harald",
"",
"Munich U."
]
] | We consider a model for the electroweak interactions based on the assumption that physical particles are singlets under the gauge group SU(2). The concept of complementarity explains why the standard model works with such an extraordinary precision although the fermions and bosons of the model can be viewed as composite objects of some more fundamental fermions and bosons. We study the incorporation of QED in the model. Furthermore we consider possible deviations from the standard model at very high energies, e.g. excited states of the weak bosons. |
hep-ph/0506106 | Keith Olive | Keith A. Olive, Maxim Pospelov, Adam Ritz and Yudi Santoso | CP-odd Phase Correlations and Electric Dipole Moments | 31 pages, 21 eps figures; v2: additional remarks on 2-loop threshold
corrections and references added; v3: typos corrected, to appear in Phys.
Rev. D | Phys.Rev.D72:075001,2005 | 10.1103/PhysRevD.72.075001 | UMN-TH-2401/05, FTPI-MINN-05/13, CERN-PH-TH-2005-095 | hep-ph | null | We revisit the constraints imposed by electric dipole moments (EDMs) of
nucleons and heavy atoms on new CP-violating sources within supersymmetric
theories. We point out that certain two-loop renormalization group corrections
induce significant mixing between the basis-invariant CP-odd phases. In the
framework of the constrained minimal supersymmetric standard model (CMSSM), the
CP-odd invariant related to the soft trilinear A-phase at the GUT scale,
theta_A, induces non-trivial and distinct CP-odd phases for the three gaugino
masses at the weak scale. The latter give one-loop contributions to EDMs
enhanced by tan beta, and can provide the dominant contribution to the electron
EDM induced by theta_A. We perform a detailed analysis of the EDM constraints
within the CMSSM, exhibiting the reach, in terms of sparticle spectra, which
may be obtained assuming generic phases, as well as the limits on the CP-odd
phases for some specific parameter points where detailed phenomenological
studies are available. We also illustrate how this reach will expand with
results from the next generation of experiments which are currently in
development.
| [
{
"created": "Fri, 10 Jun 2005 16:51:32 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Jun 2005 14:22:15 GMT",
"version": "v2"
},
{
"created": "Fri, 16 Sep 2005 10:01:15 GMT",
"version": "v3"
}
] | 2009-09-15 | [
[
"Olive",
"Keith A.",
""
],
[
"Pospelov",
"Maxim",
""
],
[
"Ritz",
"Adam",
""
],
[
"Santoso",
"Yudi",
""
]
] | We revisit the constraints imposed by electric dipole moments (EDMs) of nucleons and heavy atoms on new CP-violating sources within supersymmetric theories. We point out that certain two-loop renormalization group corrections induce significant mixing between the basis-invariant CP-odd phases. In the framework of the constrained minimal supersymmetric standard model (CMSSM), the CP-odd invariant related to the soft trilinear A-phase at the GUT scale, theta_A, induces non-trivial and distinct CP-odd phases for the three gaugino masses at the weak scale. The latter give one-loop contributions to EDMs enhanced by tan beta, and can provide the dominant contribution to the electron EDM induced by theta_A. We perform a detailed analysis of the EDM constraints within the CMSSM, exhibiting the reach, in terms of sparticle spectra, which may be obtained assuming generic phases, as well as the limits on the CP-odd phases for some specific parameter points where detailed phenomenological studies are available. We also illustrate how this reach will expand with results from the next generation of experiments which are currently in development. |
hep-ph/0009216 | Rahul Basu | Ramesh Anishetty and Rahul Basu (IMSc, Madras) | Dileptons from $\eta_c$ in Nucleus-Nucleus collisions | LaTeX2e, 8 pages, 5 figure files (eps), minor changes, version to
appear in Phys. Lett. B | Phys.Lett. B495 (2000) 295-299 | 10.1016/S0370-2693(00)01248-X | IMSc-2000/09/51 | hep-ph | null | Preliminary estimates suggest that excess dimuon production with invariant
mass in the range 1.5 -- 2.5 GeV in nucleus-nucleus collisions can be explained
on the basis of $\eta_c$ production. This appears to be consistent with all the
peripheral and central collision data with various nuclei such as S-U at 200
GeV/nucleon except for the central collision data on Pb-Pb at 158 GeV/nucleon.
Some explanations based on glueball production for Pb-Pb data are discussed.
| [
{
"created": "Tue, 19 Sep 2000 04:29:39 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Oct 2000 10:34:36 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Anishetty",
"Ramesh",
"",
"IMSc, Madras"
],
[
"Basu",
"Rahul",
"",
"IMSc, Madras"
]
] | Preliminary estimates suggest that excess dimuon production with invariant mass in the range 1.5 -- 2.5 GeV in nucleus-nucleus collisions can be explained on the basis of $\eta_c$ production. This appears to be consistent with all the peripheral and central collision data with various nuclei such as S-U at 200 GeV/nucleon except for the central collision data on Pb-Pb at 158 GeV/nucleon. Some explanations based on glueball production for Pb-Pb data are discussed. |
2401.04499 | Carlota Andres | Carlota Andres | Jet medium modifications | Proceedings for Hard Probes 2023. 10 pages, 2 figures | null | null | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | Since the start of the heavy-ion collision programs at the Relativistic Heavy
Ion Collider and the Large Hadron Collider, the study of jet modifications
resulting from their interactions with the produced QCD matter has provided a
unique tool to investigate and characterize the properties of the quark-gluon
plasma. In this mini-overview, I will present the recent theoretical
advancements in describing and understanding the modifications of jets within a
QCD medium.
| [
{
"created": "Tue, 9 Jan 2024 11:23:16 GMT",
"version": "v1"
}
] | 2024-01-10 | [
[
"Andres",
"Carlota",
""
]
] | Since the start of the heavy-ion collision programs at the Relativistic Heavy Ion Collider and the Large Hadron Collider, the study of jet modifications resulting from their interactions with the produced QCD matter has provided a unique tool to investigate and characterize the properties of the quark-gluon plasma. In this mini-overview, I will present the recent theoretical advancements in describing and understanding the modifications of jets within a QCD medium. |
1511.07255 | Shun Zhou | Shun Zhou | Theoretical Results on Neutrinos | 15 pages, 3 figures, contribution to Lepton Photon 2015, 17-22
August, Ljubljana, Slovenia | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this talk, I first summarize our current knowledge about the fundamental
properties of neutrinos and emphasize the remaining unsolved problems in
neutrino physics. Then, recent theoretical results on neutrino mass models are
introduced. Different approaches to understanding tiny neutrino masses, lepton
flavor mixing and CP violation are presented. Finally, I report briefly some
new progress in the studies of astrophysical neutrinos, including keV sterile
neutrinos, supernova neutrinos and ultrahigh-energy cosmic neutrinos.
| [
{
"created": "Mon, 23 Nov 2015 15:01:53 GMT",
"version": "v1"
}
] | 2015-11-24 | [
[
"Zhou",
"Shun",
""
]
] | In this talk, I first summarize our current knowledge about the fundamental properties of neutrinos and emphasize the remaining unsolved problems in neutrino physics. Then, recent theoretical results on neutrino mass models are introduced. Different approaches to understanding tiny neutrino masses, lepton flavor mixing and CP violation are presented. Finally, I report briefly some new progress in the studies of astrophysical neutrinos, including keV sterile neutrinos, supernova neutrinos and ultrahigh-energy cosmic neutrinos. |
hep-ph/0502137 | Umberto D'Alesio | U. D'Alesio (University and INFN, Cagliari, Italy) | Hadron Spin Structure: Novel Effects from Transverse Single Spin
Asymmetries | LaTeX 2e, 3 pages, 2 ps figures, uses aipproc.cls. Talk delivered at
the 6th Conference on ``Quark Confinement and the Hadron Spectrum'',
September 21-25, 2004, Villasimius, Italy | null | 10.1063/1.1921021 | null | hep-ph | null | Transverse single spin asymmetries can be a challenging tool in our
understanding of the internal structure of hadrons. Some aspects and recent
results are discussed.
| [
{
"created": "Tue, 15 Feb 2005 12:45:25 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"D'Alesio",
"U.",
"",
"University and INFN, Cagliari, Italy"
]
] | Transverse single spin asymmetries can be a challenging tool in our understanding of the internal structure of hadrons. Some aspects and recent results are discussed. |
0710.4921 | Sergey Afonin | S. S. Afonin | Weinberg like sum rules revisited | 31 pages, noticed misprints are corrected, references are added, and
other minor corrections are made | PMC Phys.A3:1,2009 | 10.1186/1754-0410-3-1 | null | hep-ph | null | The generalized Weinberg sum rules containing the difference of isovector
vector and axial-vector spectral functions saturated by both finite and
infinite number of narrow resonances are considered. We summarize the status of
these sum rules and analyze their overall agreement with phenomenological
Lagrangians, low-energy relations, parity doubling, hadron string models, and
experimental data.
| [
{
"created": "Thu, 25 Oct 2007 17:31:03 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Oct 2007 15:22:02 GMT",
"version": "v2"
}
] | 2009-05-07 | [
[
"Afonin",
"S. S.",
""
]
] | The generalized Weinberg sum rules containing the difference of isovector vector and axial-vector spectral functions saturated by both finite and infinite number of narrow resonances are considered. We summarize the status of these sum rules and analyze their overall agreement with phenomenological Lagrangians, low-energy relations, parity doubling, hadron string models, and experimental data. |
hep-ph/9707528 | George W. S. Hou | George Wei-Shu Hou | Perspectives on Quark Mass and Mixing Relations | 16 pages, latex, two eps figures (included). [NOTE ADDED: Talk
presented at the Workshop on Masses and Mixings of Quarks and Leptons,
University of Shizuoka, Japan, March 19 - 21, 1997] | null | null | NTUTH-97-04 | hep-ph | null | Two down-up perspectives on quark mass-mixing relations are reviewed. The
modified Fritzsch path relates $V_{cb}$ and $V_{ub}$ to $M_u$, but has trouble
with the low $V_{cb} \simeq 0.04$ value. The modified Wolfenstein path focuses
on the change in $V_{ub}$ from $\lambda^3 { (ca. 1983)} \leadsto \lambda^4 {
(ca. 1994)}$. The relations $m_d/m_s\sim m_s/m_b \sim \delta \sim \lambda^2
\simeq | V_{cb}| \simeq | V_{us}|^2$ and $m_u/m_c\sim m_c/m_t \sim \delta^2
\sim \lambda^4 \sim | V_{ub}|$ suggest a clean separation of the origin of
$V_{KM}$: $| V_{us}| \equiv \lambda$ and $| V_{cb}| \equiv \delta$ arise from
$M_d$ while $V_{ub} \equiv B\lambda^4 e^{-i\phi}$ comes from $M_u$. Five to six
parameters might suffice for ten mass-mixing parameters, with $\delta$
seemingly the more sensible expansion parameter, while $\lambda \simeq
\sqrt{m_d/m_s}$ is tied empirically to $(M_d)_{11} = 0$. The approximate
relations suggest a near weak scale origin of flavor.
| [
{
"created": "Thu, 31 Jul 1997 02:00:39 GMT",
"version": "v1"
},
{
"created": "Sat, 2 Aug 1997 05:57:54 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Hou",
"George Wei-Shu",
""
]
] | Two down-up perspectives on quark mass-mixing relations are reviewed. The modified Fritzsch path relates $V_{cb}$ and $V_{ub}$ to $M_u$, but has trouble with the low $V_{cb} \simeq 0.04$ value. The modified Wolfenstein path focuses on the change in $V_{ub}$ from $\lambda^3 { (ca. 1983)} \leadsto \lambda^4 { (ca. 1994)}$. The relations $m_d/m_s\sim m_s/m_b \sim \delta \sim \lambda^2 \simeq | V_{cb}| \simeq | V_{us}|^2$ and $m_u/m_c\sim m_c/m_t \sim \delta^2 \sim \lambda^4 \sim | V_{ub}|$ suggest a clean separation of the origin of $V_{KM}$: $| V_{us}| \equiv \lambda$ and $| V_{cb}| \equiv \delta$ arise from $M_d$ while $V_{ub} \equiv B\lambda^4 e^{-i\phi}$ comes from $M_u$. Five to six parameters might suffice for ten mass-mixing parameters, with $\delta$ seemingly the more sensible expansion parameter, while $\lambda \simeq \sqrt{m_d/m_s}$ is tied empirically to $(M_d)_{11} = 0$. The approximate relations suggest a near weak scale origin of flavor. |
hep-ph/0604236 | Mikhail Shaposhnikov | Mikhail Shaposhnikov and Igor Tkachev | The $\nu$MSM, Inflation, and Dark Matter | 9 pages, misprints corrected, final version appeared in Phys. Lett | Phys.Lett.B639:414-417,2006 | 10.1016/j.physletb.2006.06.063 | CERN-PH-TH/2006-069 | hep-ph astro-ph hep-th | null | We show how to enlarge the $\nu$MSM (the minimal extension of the standard
model by three right-handed neutrinos) to incorporate inflation and provide a
common source for electroweak symmetry breaking and for right-handed neutrino
masses. In addition to inflation, the resulting theory can explain
simultaneously dark matter and the baryon asymmetry of the Universe; it is
consistent with experiments on neutrino oscillations and with all astrophysical
and cosmological constraints on sterile neutrino as a dark matter candidate.
The mass of inflaton can be much smaller than the electroweak scale.
| [
{
"created": "Thu, 27 Apr 2006 19:29:15 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Aug 2006 08:50:21 GMT",
"version": "v2"
}
] | 2011-05-05 | [
[
"Shaposhnikov",
"Mikhail",
""
],
[
"Tkachev",
"Igor",
""
]
] | We show how to enlarge the $\nu$MSM (the minimal extension of the standard model by three right-handed neutrinos) to incorporate inflation and provide a common source for electroweak symmetry breaking and for right-handed neutrino masses. In addition to inflation, the resulting theory can explain simultaneously dark matter and the baryon asymmetry of the Universe; it is consistent with experiments on neutrino oscillations and with all astrophysical and cosmological constraints on sterile neutrino as a dark matter candidate. The mass of inflaton can be much smaller than the electroweak scale. |
hep-ph/0407223 | Jernej Kamenik | S. Fajfer, J. Kamenik, P. Singer | New-Physics scenarios in $\Delta S = 2$ decays of the B_c meson | 21 pages | Phys.Rev.D70:074022,2004 | 10.1103/PhysRevD.70.074022 | null | hep-ph | null | The $\Delta S = 2$ transition $b \to s s \bar d$ is extremely small in the
standard model, proceeding only via box diagrams. Such decays are thus an
appropriate ground for searching new physics. We present a study of several
two-body and three-body decays of the B_c meson belonging to this class. Our
calculation covers the minimal supersymmetric model with and without R-parity
and a two-Higgs-doublet model. The current limits on the parameters of these
models allow for rather large branching ratios for several two and three-body
hadronic decay modes of B_c, up to the 10^{-4} range in the minimal
supersymmetric model with R-parity violation.
| [
{
"created": "Tue, 20 Jul 2004 10:03:07 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Fajfer",
"S.",
""
],
[
"Kamenik",
"J.",
""
],
[
"Singer",
"P.",
""
]
] | The $\Delta S = 2$ transition $b \to s s \bar d$ is extremely small in the standard model, proceeding only via box diagrams. Such decays are thus an appropriate ground for searching new physics. We present a study of several two-body and three-body decays of the B_c meson belonging to this class. Our calculation covers the minimal supersymmetric model with and without R-parity and a two-Higgs-doublet model. The current limits on the parameters of these models allow for rather large branching ratios for several two and three-body hadronic decay modes of B_c, up to the 10^{-4} range in the minimal supersymmetric model with R-parity violation. |
1306.6108 | Roberto Franceschini | R. Franceschini and R. N. Mohapatra | Radiatively Induced Type II seesaw and Vector-like 5/3 Charge Quarks | 25 pages, 2 figures | null | 10.1103/PhysRevD.89.055013 | UMD-PP-013-007 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Understanding small neutrino masses in type II seesaw models with TeV scale
SM triplet Higgs bosons requires that its coupling with the standard model
Higgs doublet H be dialed down to be order eV to KeV, which is a fine-tuning by
a factor of $10^{-11}-10^{-8}$ with respect to the weak scale. We present a
SUSY extension of the type II seesaw model where this dimensionful small
coupling is radiatively induced, thus making its smallness natural. This model
has an exotic vector-like quark doublet which contains a quark X with electric
charge 5/3 and a top partner t'. We discuss in details the phenomenology of the
model paying special attention to the consequences of the interactions of the
the exotic heavy quarks and the scalars of the model. Implications for
neutrinoless double beta decay and for the LHC experiments are discussed in
detail. Remarkably, in this model both the seesaw triplet and the heavy quarks
can manifest at colliders in a host of different signatures, including some
that significantly differ from those of the minimal models. Depending on the
choice of the hierarchy of couplings, the decay of the heavy quarks and of the
seesaw triplet may be subject to bounds that can be tighter or looser than the
bounds from standard LHC searches. Furthermore we point out a new
short-distance contribution to neutrinoless double beta decay mediated by the
simultaneous propagation of the type II triplet and exotic fermions. Remarkably
this contribution to the neutrinoless double beta decay is parametrically quite
independent from the scale of the generated neutrino mass.
| [
{
"created": "Wed, 26 Jun 2013 00:02:37 GMT",
"version": "v1"
}
] | 2015-06-16 | [
[
"Franceschini",
"R.",
""
],
[
"Mohapatra",
"R. N.",
""
]
] | Understanding small neutrino masses in type II seesaw models with TeV scale SM triplet Higgs bosons requires that its coupling with the standard model Higgs doublet H be dialed down to be order eV to KeV, which is a fine-tuning by a factor of $10^{-11}-10^{-8}$ with respect to the weak scale. We present a SUSY extension of the type II seesaw model where this dimensionful small coupling is radiatively induced, thus making its smallness natural. This model has an exotic vector-like quark doublet which contains a quark X with electric charge 5/3 and a top partner t'. We discuss in details the phenomenology of the model paying special attention to the consequences of the interactions of the the exotic heavy quarks and the scalars of the model. Implications for neutrinoless double beta decay and for the LHC experiments are discussed in detail. Remarkably, in this model both the seesaw triplet and the heavy quarks can manifest at colliders in a host of different signatures, including some that significantly differ from those of the minimal models. Depending on the choice of the hierarchy of couplings, the decay of the heavy quarks and of the seesaw triplet may be subject to bounds that can be tighter or looser than the bounds from standard LHC searches. Furthermore we point out a new short-distance contribution to neutrinoless double beta decay mediated by the simultaneous propagation of the type II triplet and exotic fermions. Remarkably this contribution to the neutrinoless double beta decay is parametrically quite independent from the scale of the generated neutrino mass. |
2203.11110 | Joshua Isaacson | J. M. Campbell, M. Diefenthaler, T. J. Hobbs, S. H\"oche, J. Isaacson,
F. Kling, S. Mrenna, J. Reuter, S. Alioli, J. R. Andersen, C. Andreopoulos,
A. M. Ankowski, E. C. Aschenauer, A. Ashkenazi, M. D. Baker, J. L. Barrow, M.
van Beekveld, G. Bewick, S. Bhattacharya, C. Bierlich, E. Bothmann, P. Bredt,
A. Broggio, A. Buckley, A. Butter, J. M. Butterworth, E. P. Byrne, C. M.
Carloni Calame, S. Chakraborty, X. Chen, M. Chiesa, J. T. Childers, J.
Cruz-Martinez, J. Currie, N. Darvishi, M. Dasgupta, A. Denner, F. A. Dreyer,
S. Dytman, B. K. El-Menoufi, T. Engel, S. Ferrario Ravasio, D. Figueroa, L.
Flower, J. R. Forshaw, R. Frederix, A. Friedland, S. Frixione, H. Gallagher,
K. Gallmeister, S. Gardiner, R. Gauld, J. Gaunt, A. Gavardi, T. Gehrmann, A.
Gehrmann-De Ridder, L. Gellersen, W. Giele, S. Gieseke, F. Giuli, E. W. N.
Glover, M. Grazzini, A. Grohsjean, C. G\"utschow, K. Hamilton, T. Han, R.
Hatcher, G. Heinrich, I. Helenius, O. Hen, V. Hirschi, M. H\"ofer, J.
Holguin, A. Huss, P. Ilten, S. Jadach, A. Jentsch, S.P. Jones, W. Ju, S.
Kallweit, A. Karlberg, T. Katori, M. Kerner, W. Kilian, M. M.
Kirchgae{\ss}er, S. Klein, M. Knobbe, C. Krause, F. Krauss, J. Lang, J.-N.
Lang, G. Lee, S. W. Li, M. A. Lim, J. M. Lindert, D. Lombardi, L. L\"onnblad,
M. L\"oschner, N. Lurkin, Y. Ma, P. Machado, V. Magerya, A. Maier, I. Majer,
F. Maltoni, M. Marcoli, G. Marinelli, M. R. Masouminia, P. Mastrolia, O.
Mattelaer, J. Mazzitelli, J. McFayden, R. Medves, P. Meinzinger, J. Mo, P. F.
Monni, G. Montagna, T. Morgan, U. Mosel, B. Nachman, P. Nadolsky, R. Nagar,
Z. Nagy, D. Napoletano, P. Nason, T. Neumann, L. J. Nevay, O. Nicrosini, J.
Niehues, K. Niewczas, T. Ohl, G. Ossola, V. Pandey, A. Papadopoulou, A.
Papaefstathiou, G. Paz, M. Pellen, G. Pelliccioli, T. Peraro, F. Piccinini,
L. Pickering, J. Pires, W. P{\l}aczek, S. Pl\"atzer, T. Plehn, S. Pozzorini,
S. Prestel, C. T. Preuss, A. C. Price, S. Quackenbush, E. Re, D. Reichelt, L.
Reina, C. Reuschle, P. Richardson, M. Rocco, N. Rocco, M. Roda, A. Rodriguez
Garcia, S. Roiser, J. Rojo, L. Rottoli, G. P. Salam, M. Sch\"onherr, S.
Schuchmann, S. Schumann, R. Sch\"urmann, L. Scyboz, M. H. Seymour, F.
Siegert, A. Signer, G. Singh Chahal, A. Si\'odmok, T. Sj\"ostrand, P. Skands,
J. M. Smillie, J. T. Sobczyk, D. Soldin, D. E. Soper, A. Soto-Ontoso, G.
Soyez, G. Stagnitto, J. Tena-Vidal, O. Tomalak, F. Tramontano, S.
Trojanowski, Z. Tu, S. Uccirati, T. Ullrich, Y. Ulrich, M. Utheim, A.
Valassi, A. Verbytskyi, R. Verheyen, M. Wagman, D. Walker, B. R. Webber, L.
Weinstein, O. White, J. Whitehead, M. Wiesemann, C. Wilkinson, C. Williams,
R. Winterhalder, C. Wret, K. Xie, T-Z. Yang, E. Yazgan, G. Zanderighi, S.
Zanoli, and K. Zapp | Event Generators for High-Energy Physics Experiments | 164 pages, 10 figures, contribution to Snowmass 2021 | null | null | CP3-22-12, DESY-22-042, FERMILAB-PUB-22-116-SCD-T, IPPP/21/51,
JLAB-PHY-22-3576, KA-TP-04-2022, LA-UR-22-22126, LU-TP-22-12, MCNET-22-04,
OUTP-22-03P, P3H-22-024, PITT-PACC 2207, UCI-TR-2022-02 | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | We provide an overview of the status of Monte-Carlo event generators for
high-energy particle physics. Guided by the experimental needs and
requirements, we highlight areas of active development, and opportunities for
future improvements. Particular emphasis is given to physics models and
algorithms that are employed across a variety of experiments. These common
themes in event generator development lead to a more comprehensive
understanding of physics at the highest energies and intensities, and allow
models to be tested against a wealth of data that have been accumulated over
the past decades. A cohesive approach to event generator development will allow
these models to be further improved and systematic uncertainties to be reduced,
directly contributing to future experimental success. Event generators are part
of a much larger ecosystem of computational tools. They typically involve a
number of unknown model parameters that must be tuned to experimental data,
while maintaining the integrity of the underlying physics models. Making both
these data, and the analyses with which they have been obtained accessible to
future users is an essential aspect of open science and data preservation. It
ensures the consistency of physics models across a variety of experiments.
| [
{
"created": "Mon, 21 Mar 2022 16:40:17 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Oct 2022 15:09:56 GMT",
"version": "v2"
},
{
"created": "Tue, 23 Jan 2024 21:49:41 GMT",
"version": "v3"
}
] | 2024-01-25 | [
[
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"J. M.",
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"A.",
""
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""
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[
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"X.",
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[
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""
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[
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"J.",
""
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""
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[
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[
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"T.",
""
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[
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[
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[
"Kerner",
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[
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"W.",
""
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[
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""
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[
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""
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[
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"M.",
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[
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""
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[
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"F.",
""
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[
"Lang",
"J.",
""
],
[
"Lang",
"J. -N.",
""
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[
"Lee",
"G.",
""
],
[
"Li",
"S. W.",
""
],
[
"Lim",
"M. A.",
""
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[
"Lindert",
"J. M.",
""
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[
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"D.",
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[
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"L.",
""
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[
"Löschner",
"M.",
""
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[
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"N.",
""
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[
"Ma",
"Y.",
""
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[
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"P.",
""
],
[
"Magerya",
"V.",
""
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[
"Maier",
"A.",
""
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[
"Majer",
"I.",
""
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[
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"F.",
""
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[
"Marcoli",
"M.",
""
],
[
"Marinelli",
"G.",
""
],
[
"Masouminia",
"M. R.",
""
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[
"Mastrolia",
"P.",
""
],
[
"Mattelaer",
"O.",
""
],
[
"Mazzitelli",
"J.",
""
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[
"McFayden",
"J.",
""
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[
"Medves",
"R.",
""
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[
"Meinzinger",
"P.",
""
],
[
"Mo",
"J.",
""
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[
"Monni",
"P. F.",
""
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[
"Montagna",
"G.",
""
],
[
"Morgan",
"T.",
""
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[
"Mosel",
"U.",
""
],
[
"Nachman",
"B.",
""
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[
"Nadolsky",
"P.",
""
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[
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[
"Nagy",
"Z.",
""
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[
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"D.",
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"P.",
""
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[
"Neumann",
"T.",
""
],
[
"Nevay",
"L. J.",
""
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[
"Nicrosini",
"O.",
""
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[
"Niehues",
"J.",
""
],
[
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"K.",
""
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[
"Ohl",
"T.",
""
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[
"Ossola",
"G.",
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[
"Pandey",
"V.",
""
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[
"Papadopoulou",
"A.",
""
],
[
"Papaefstathiou",
"A.",
""
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[
"Paz",
"G.",
""
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[
"Pellen",
"M.",
""
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[
"Pelliccioli",
"G.",
""
],
[
"Peraro",
"T.",
""
],
[
"Piccinini",
"F.",
""
],
[
"Pickering",
"L.",
""
],
[
"Pires",
"J.",
""
],
[
"Płaczek",
"W.",
""
],
[
"Plätzer",
"S.",
""
],
[
"Plehn",
"T.",
""
],
[
"Pozzorini",
"S.",
""
],
[
"Prestel",
"S.",
""
],
[
"Preuss",
"C. T.",
""
],
[
"Price",
"A. C.",
""
],
[
"Quackenbush",
"S.",
""
],
[
"Re",
"E.",
""
],
[
"Reichelt",
"D.",
""
],
[
"Reina",
"L.",
""
],
[
"Reuschle",
"C.",
""
],
[
"Richardson",
"P.",
""
],
[
"Rocco",
"M.",
""
],
[
"Rocco",
"N.",
""
],
[
"Roda",
"M.",
""
],
[
"Garcia",
"A. Rodriguez",
""
],
[
"Roiser",
"S.",
""
],
[
"Rojo",
"J.",
""
],
[
"Rottoli",
"L.",
""
],
[
"Salam",
"G. P.",
""
],
[
"Schönherr",
"M.",
""
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[
"Schuchmann",
"S.",
""
],
[
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"S.",
""
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[
"Schürmann",
"R.",
""
],
[
"Scyboz",
"L.",
""
],
[
"Seymour",
"M. H.",
""
],
[
"Siegert",
"F.",
""
],
[
"Signer",
"A.",
""
],
[
"Chahal",
"G. Singh",
""
],
[
"Siódmok",
"A.",
""
],
[
"Sjöstrand",
"T.",
""
],
[
"Skands",
"P.",
""
],
[
"Smillie",
"J. M.",
""
],
[
"Sobczyk",
"J. T.",
""
],
[
"Soldin",
"D.",
""
],
[
"Soper",
"D. E.",
""
],
[
"Soto-Ontoso",
"A.",
""
],
[
"Soyez",
"G.",
""
],
[
"Stagnitto",
"G.",
""
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[
"Tena-Vidal",
"J.",
""
],
[
"Tomalak",
"O.",
""
],
[
"Tramontano",
"F.",
""
],
[
"Trojanowski",
"S.",
""
],
[
"Tu",
"Z.",
""
],
[
"Uccirati",
"S.",
""
],
[
"Ullrich",
"T.",
""
],
[
"Ulrich",
"Y.",
""
],
[
"Utheim",
"M.",
""
],
[
"Valassi",
"A.",
""
],
[
"Verbytskyi",
"A.",
""
],
[
"Verheyen",
"R.",
""
],
[
"Wagman",
"M.",
""
],
[
"Walker",
"D.",
""
],
[
"Webber",
"B. R.",
""
],
[
"Weinstein",
"L.",
""
],
[
"White",
"O.",
""
],
[
"Whitehead",
"J.",
""
],
[
"Wiesemann",
"M.",
""
],
[
"Wilkinson",
"C.",
""
],
[
"Williams",
"C.",
""
],
[
"Winterhalder",
"R.",
""
],
[
"Wret",
"C.",
""
],
[
"Xie",
"K.",
""
],
[
"Yang",
"T-Z.",
""
],
[
"Yazgan",
"E.",
""
],
[
"Zanderighi",
"G.",
""
],
[
"Zanoli",
"S.",
""
],
[
"Zapp",
"K.",
""
]
] | We provide an overview of the status of Monte-Carlo event generators for high-energy particle physics. Guided by the experimental needs and requirements, we highlight areas of active development, and opportunities for future improvements. Particular emphasis is given to physics models and algorithms that are employed across a variety of experiments. These common themes in event generator development lead to a more comprehensive understanding of physics at the highest energies and intensities, and allow models to be tested against a wealth of data that have been accumulated over the past decades. A cohesive approach to event generator development will allow these models to be further improved and systematic uncertainties to be reduced, directly contributing to future experimental success. Event generators are part of a much larger ecosystem of computational tools. They typically involve a number of unknown model parameters that must be tuned to experimental data, while maintaining the integrity of the underlying physics models. Making both these data, and the analyses with which they have been obtained accessible to future users is an essential aspect of open science and data preservation. It ensures the consistency of physics models across a variety of experiments. |
hep-ph/9310309 | Herbert Weigel | H. Weigel, R. Alkofer and H. Reinhardt | Hyperons in the Bound State Approach to the Nambu--Jona-Lasinio Chiral
Soliton | 40 pages, 5 figuers (not included, avaible upon request)
UNITU-THEP-14/1993 | Nucl.Phys.A576:477-524,1994 | 10.1016/0375-9474(94)90742-0 | null | hep-ph | null | For the Nambu--Jona--Lasinio (NJL) model in the proper time regularization
scheme the chiral soliton is investigated for the case of three flavors within
the framework of the bound state approach to strangeness. For this purpose
meson fluctuations off the non--strange soliton are considered. For the kaon
P--wave channel the emerging Bethe--Salpeter equation is solved yielding the
bound state energy and wave--function. This kaon bound state also induces a
strange valence quark wave--function. Collective coordinates are introduced for
the SU(2) isorotations and the coupling of the bound state to these rotations
is determined. The total spin is decomposed into parts carried by the soliton
and the bound state. The absolute value of the former is identical to the total
isospin while the latter is demonstrated to be identical to the expectation
value of the grand spin, the sum of spin and isospin. The functional trace
involves quark states with various grand spins which get polarized by the kaon
bound state. This polarization results in a normalization of the coupling
between the collective rotation and the bound state different from the Skyrme
model. Nevertheless after quantization the expression for the baryon masses can
be cast into the form found by Callan and Klebanov for the Skyrme model.
Numerical results for the baryon spectrum are compared to those obtained in the
same model using the collective approach of Yabu and Ando. It is found that for
$\frac{1}{2}^+$ baryons the bound state treatment reproduces the experimental
data better than the collective approach while there are only small differences
between the two approaches for the $\frac{3}{2}^+$ baryons. Both treatments
underestimate the mass splittings for baryons with different strangeness. This
short-coming is conjectured to be inherited from the meson sector of the NJL
model where too small a ratio of the kaon and pion decay constants is
predicted.
| [
{
"created": "Tue, 19 Oct 1993 09:44:49 GMT",
"version": "v1"
}
] | 2009-09-25 | [
[
"Weigel",
"H.",
""
],
[
"Alkofer",
"R.",
""
],
[
"Reinhardt",
"H.",
""
]
] | For the Nambu--Jona--Lasinio (NJL) model in the proper time regularization scheme the chiral soliton is investigated for the case of three flavors within the framework of the bound state approach to strangeness. For this purpose meson fluctuations off the non--strange soliton are considered. For the kaon P--wave channel the emerging Bethe--Salpeter equation is solved yielding the bound state energy and wave--function. This kaon bound state also induces a strange valence quark wave--function. Collective coordinates are introduced for the SU(2) isorotations and the coupling of the bound state to these rotations is determined. The total spin is decomposed into parts carried by the soliton and the bound state. The absolute value of the former is identical to the total isospin while the latter is demonstrated to be identical to the expectation value of the grand spin, the sum of spin and isospin. The functional trace involves quark states with various grand spins which get polarized by the kaon bound state. This polarization results in a normalization of the coupling between the collective rotation and the bound state different from the Skyrme model. Nevertheless after quantization the expression for the baryon masses can be cast into the form found by Callan and Klebanov for the Skyrme model. Numerical results for the baryon spectrum are compared to those obtained in the same model using the collective approach of Yabu and Ando. It is found that for $\frac{1}{2}^+$ baryons the bound state treatment reproduces the experimental data better than the collective approach while there are only small differences between the two approaches for the $\frac{3}{2}^+$ baryons. Both treatments underestimate the mass splittings for baryons with different strangeness. This short-coming is conjectured to be inherited from the meson sector of the NJL model where too small a ratio of the kaon and pion decay constants is predicted. |
hep-ph/9811204 | Hans C. Eggers | H.C. Eggers, M. Greiner and P. Lipa | Analytical solution for multivariate statistics in random multiplicative
cascades | Workshop on Correlations and Fluctuations, Matrahaza, June 98, uses
sprocl.sty, 8 pages, 8 figs, 3 typos corrected | null | null | STPHY 29/98 | hep-ph chao-dyn nlin.CD | null | It has long been a puzzle how to solve random multiplicative cascade
structures analytically. We present an analytical solution found recently in
the form of a simple pedagogical example of the general case.
| [
{
"created": "Sat, 31 Oct 1998 15:41:41 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Nov 1998 15:07:00 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Eggers",
"H. C.",
""
],
[
"Greiner",
"M.",
""
],
[
"Lipa",
"P.",
""
]
] | It has long been a puzzle how to solve random multiplicative cascade structures analytically. We present an analytical solution found recently in the form of a simple pedagogical example of the general case. |
1307.2215 | Martin Schumacher | Martin Schumacher | Dispersion theory of nucleon polarizabilities and outlook on chiral
effective field theory | Contribution prepared for the workshop "Compton scattering off
Protons and Light Nuclei pinning down the nucleon polarizabilities" ETC*
Trento Italy, July 29 . Aug. 2,2013 | null | null | null | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Based on Compton scattering and meson photoproduction data the
polarizabilities of the nucleon are precisely studied and well understood due
to recent experimental and theoretical work based on nonsubtracted dispersion
relations. The {\it recommended} experimental values are $\alpha_p=12.0\pm
0.6$, $(12.0)$, $\beta_p=1.9\mp 0.6$, $(1.9)$, $\alpha_n=12.5\pm 1.7$,
$(12.7\pm 0.9)$, $\beta_n=2.7\mp 1.8$, $(2.5\mp 0.9)$ in units of
$10^{-4}$fm$^3$ and $\gamma^{(p)}_\pi=-36.4\pm 1.5$, $(-36.6)$,
$\gamma^{(n)}_\pi=+58.6\pm 4.0$, $(58.3)$, $(\gamma^{(p)}_0=-0.58\pm 0.20)$,
$\gamma^{(n)}_0=0.38\pm 0.22)$ in units of $10^{-4}$fm$^4$ [1]. The numbers
given in parentheses are predicted values. It is shown that all versions of
chiral effective field theories applied in analyses of nucleon polarizabilities
and Compton scattering ignore essential effects of $\omega$, $\rho$ and
$\sigma$ exchanges and of pseudoscalar $\pi$N coupling.
| [
{
"created": "Mon, 8 Jul 2013 19:41:49 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Jul 2014 09:02:58 GMT",
"version": "v2"
}
] | 2014-08-01 | [
[
"Schumacher",
"Martin",
""
]
] | Based on Compton scattering and meson photoproduction data the polarizabilities of the nucleon are precisely studied and well understood due to recent experimental and theoretical work based on nonsubtracted dispersion relations. The {\it recommended} experimental values are $\alpha_p=12.0\pm 0.6$, $(12.0)$, $\beta_p=1.9\mp 0.6$, $(1.9)$, $\alpha_n=12.5\pm 1.7$, $(12.7\pm 0.9)$, $\beta_n=2.7\mp 1.8$, $(2.5\mp 0.9)$ in units of $10^{-4}$fm$^3$ and $\gamma^{(p)}_\pi=-36.4\pm 1.5$, $(-36.6)$, $\gamma^{(n)}_\pi=+58.6\pm 4.0$, $(58.3)$, $(\gamma^{(p)}_0=-0.58\pm 0.20)$, $\gamma^{(n)}_0=0.38\pm 0.22)$ in units of $10^{-4}$fm$^4$ [1]. The numbers given in parentheses are predicted values. It is shown that all versions of chiral effective field theories applied in analyses of nucleon polarizabilities and Compton scattering ignore essential effects of $\omega$, $\rho$ and $\sigma$ exchanges and of pseudoscalar $\pi$N coupling. |
1705.09781 | Hidekazu Tanaka | Hidekazu Tanaka and Shuji Sasagawa | Quark mass function in Minkowski space | 9 pages, 3 figures | Prog Theor Exp Phys (2017) | 10.1093/ptep/ptx153 | RUP-17-9 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the properties of quark mass functions in quantum
chromodynamics calculated by the Schwinger-Dyson equation in the strong
coupling region, in which the loop integration is performed in Minkowski space.
The calculated results are compared with those obtained by integration in
Euclidean space.
| [
{
"created": "Sat, 27 May 2017 07:35:12 GMT",
"version": "v1"
}
] | 2019-12-06 | [
[
"Tanaka",
"Hidekazu",
""
],
[
"Sasagawa",
"Shuji",
""
]
] | We investigate the properties of quark mass functions in quantum chromodynamics calculated by the Schwinger-Dyson equation in the strong coupling region, in which the loop integration is performed in Minkowski space. The calculated results are compared with those obtained by integration in Euclidean space. |
hep-ph/9707223 | Michelangelo Mangano | A. Petrelli, M. Cacciari, M. Greco, F. Maltoni, M.L. Mangano | NLO Production and Decay of Quarkonium | 65 pages, Latex, epsfig, 8 figures. Typos corrected and improvements
made to the text. Version to appear on Nucl Phys. B | Nucl.Phys.B514:245-309,1998 | 10.1016/S0550-3213(97)00801-8 | CERN-TH/97-142, DESY 97-090 | hep-ph | null | We present a calculation of next-to-leading-order (NLO) QCD corrections to
total hadronic production cross sections and to light-hadron-decay rates of
heavy quarkonium states. Both colour-singlet and colour-octet contributions are
included. We discuss in detail the use of covariant projectors in dimensional
regularization, the structure of soft-gluon emission and the overall finiteness
of radiative corrections. We compare our approach with the
NLO version of the threshold-expansion technique recently introduced by
Braaten and Chen. Most of the results presented here are new. Others
represent the first independent reevaluation of calculations already known in
the literature. In this case a comparison with previous findings is reported.
| [
{
"created": "Wed, 2 Jul 1997 16:20:47 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Nov 1997 12:48:42 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Petrelli",
"A.",
""
],
[
"Cacciari",
"M.",
""
],
[
"Greco",
"M.",
""
],
[
"Maltoni",
"F.",
""
],
[
"Mangano",
"M. L.",
""
]
] | We present a calculation of next-to-leading-order (NLO) QCD corrections to total hadronic production cross sections and to light-hadron-decay rates of heavy quarkonium states. Both colour-singlet and colour-octet contributions are included. We discuss in detail the use of covariant projectors in dimensional regularization, the structure of soft-gluon emission and the overall finiteness of radiative corrections. We compare our approach with the NLO version of the threshold-expansion technique recently introduced by Braaten and Chen. Most of the results presented here are new. Others represent the first independent reevaluation of calculations already known in the literature. In this case a comparison with previous findings is reported. |
hep-ph/0004107 | Dr. Otto C. W. Kong | Otto C.W. Kong (Institute of Physics, Taiwan) | LR Scalar Mixings and One-loop Neutrino Masses | 19 pages in JHEP style, with 8 figures incoporated; modified with
extended discussion and a new appendix. Version to be published in JHEP | JHEP 0009:037,2000 | 10.1088/1126-6708/2000/09/037 | null | hep-ph | null | Within the framework of the complete theory of supersymmetry without
R-parity, where all possible R-parity violating terms are admitted, we perform
a systematic analytical study of all sources of neutrino masses up to ``direct
one-loop" (defined explicitly below) level. In the passing, we present the full
result for squark and slepton masses. In particular, there are interesting $LR$
squark and slepton mixings, which involve both bilinear and trilinear R-parity
violating parameters. The existence and important phenomenological implications
of such terms have been largely overlooked in previous studies. In particular,
in the studies under which either one type of the couplings is assumed to
vanish or neglected, the terms would not show up. The $LR$ mixings play a
central role in neutrino mass generation. Our results look straight forward to
be obtained, which, in our opinion, is an illustration of the effectiveness of
our formulation adopted.
| [
{
"created": "Wed, 12 Apr 2000 09:09:05 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Apr 2000 12:27:53 GMT",
"version": "v2"
},
{
"created": "Fri, 30 Jun 2000 10:03:07 GMT",
"version": "v3"
},
{
"created": "Thu, 19 Oct 2000 21:42:31 GMT",
"version": "v4"
}
] | 2014-11-17 | [
[
"Kong",
"Otto C. W.",
"",
"Institute of Physics, Taiwan"
]
] | Within the framework of the complete theory of supersymmetry without R-parity, where all possible R-parity violating terms are admitted, we perform a systematic analytical study of all sources of neutrino masses up to ``direct one-loop" (defined explicitly below) level. In the passing, we present the full result for squark and slepton masses. In particular, there are interesting $LR$ squark and slepton mixings, which involve both bilinear and trilinear R-parity violating parameters. The existence and important phenomenological implications of such terms have been largely overlooked in previous studies. In particular, in the studies under which either one type of the couplings is assumed to vanish or neglected, the terms would not show up. The $LR$ mixings play a central role in neutrino mass generation. Our results look straight forward to be obtained, which, in our opinion, is an illustration of the effectiveness of our formulation adopted. |
2207.03144 | Yucheng Qiu | Yu-Cheng Qiu and S. -H. Henry Tye | A Novel Solution to the Gravitino Problem | This revised version explains some points that are confusing in the
earlier version. The current version is the same as the published version. 23
pages, 1 figure, 2 tables | null | 10.1007/JHEP02(2023)006 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a general phenomenological model with local supersymmetry, the amount of
massive gravitinos produced in early universe tends to violate the known dark
matter density bound by many orders of magnitude. In the brane world scenario
in Type IIB string theory, we propose a novel way to evade this problem. There,
the standard model of strong and electroweak interactions live inside the
anti-${\rm D3}$-branes ($\overline{\rm D3}$-branes) that span the 3 large
spatial dimensions. Here, the "potential" Goldstino to be absorbed by the
gravitino (to become massive) is the fermion component of the open string
nilpotent superfield $X$ (i.e., $X^2=0$) which is present only inside the
$\overline{\rm D3}$-branes. This non-linear supergravity scenario offers 2 ways
to solve the gravitino problem, with very different particle physics
phenomenologies.
| [
{
"created": "Thu, 7 Jul 2022 08:06:46 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Jul 2022 10:55:14 GMT",
"version": "v2"
},
{
"created": "Mon, 10 Oct 2022 15:08:24 GMT",
"version": "v3"
},
{
"created": "Tue, 7 Feb 2023 05:35:03 GMT",
"version": "v4"
}
] | 2023-02-08 | [
[
"Qiu",
"Yu-Cheng",
""
],
[
"Tye",
"S. -H. Henry",
""
]
] | In a general phenomenological model with local supersymmetry, the amount of massive gravitinos produced in early universe tends to violate the known dark matter density bound by many orders of magnitude. In the brane world scenario in Type IIB string theory, we propose a novel way to evade this problem. There, the standard model of strong and electroweak interactions live inside the anti-${\rm D3}$-branes ($\overline{\rm D3}$-branes) that span the 3 large spatial dimensions. Here, the "potential" Goldstino to be absorbed by the gravitino (to become massive) is the fermion component of the open string nilpotent superfield $X$ (i.e., $X^2=0$) which is present only inside the $\overline{\rm D3}$-branes. This non-linear supergravity scenario offers 2 ways to solve the gravitino problem, with very different particle physics phenomenologies. |
hep-ph/9803328 | D. Delepine | J.-M.Gerard, J.Pestieau, J.Weyers | Hadronic Phases and Isospin Amplitudes in $D(B) \to \pi \pi$ and $D(B)
\to K \bar K$ Decays | 10pages,latex | Phys.Lett. B436 (1998) 363-368 | 10.1016/S0370-2693(98)00855-7 | UCL-IPT-98-04 | hep-ph | null | Hadronic phase in $\pi \pi$ and $K \bar K$ channels are calculated a la
Regge. At the D mass one finds $\delta_{\pi \pi} \approx \pi/3$ and $\delta_{K
\bar K} \approx -\pi/6$ in good agreement with the CLEO data while at the B
mass these angles are predicted to be, respectively, $11^\circ$ and $-7^\circ$.
With the hadronic phase $e^{i \delta_{K \bar K}}$ taken into account, a quark
diagram decomposition of the isospin invariant amplitudes in $D \to K \bar K$
decays fits the data provided the exchange diagram contribution is about 1/3 of
the tree level one.
| [
{
"created": "Thu, 12 Mar 1998 17:12:27 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Gerard",
"J. -M.",
""
],
[
"Pestieau",
"J.",
""
],
[
"Weyers",
"J.",
""
]
] | Hadronic phase in $\pi \pi$ and $K \bar K$ channels are calculated a la Regge. At the D mass one finds $\delta_{\pi \pi} \approx \pi/3$ and $\delta_{K \bar K} \approx -\pi/6$ in good agreement with the CLEO data while at the B mass these angles are predicted to be, respectively, $11^\circ$ and $-7^\circ$. With the hadronic phase $e^{i \delta_{K \bar K}}$ taken into account, a quark diagram decomposition of the isospin invariant amplitudes in $D \to K \bar K$ decays fits the data provided the exchange diagram contribution is about 1/3 of the tree level one. |
hep-ph/9806204 | Thomas Hambye | T. Hambye (Dortmund U.) | New Analysis of the Delta I = 1/2 Rule in the 1/N_c Expansion for K -->
pi pi Decays | 10 pages, 4 eps figures. Talk presented at the XXIth School of
Theoretical Physics "Recent Progress in Theory and Phenomenology of
Fundamental Interactions", Ustro\'n, Poland, September 19-24, 1997. Two typos
in Eq. (17) and Eq. (18) have been corrected | Acta Phys.Polon.B28:2479,1997 | null | DO-TH 98/09 | hep-ph | null | We analyze long-distance contributions to the K --> pi pi amplitudes relevant
for the Delta I = 1/2 selection rule in the framework of the 1/N_c expansion.
We use a modified prescription for the identification of meson momenta in the
chiral loop corrections to gain a consistent matching with the short-distance
part. Our approach involves a separation of non-factorizable and factorizable
1/N_c corrections. Along these lines we calculate the one-loop contributions
from the lowest order lagrangian. Our main result is an additional enhancement
of the Delta I = 1/2 channel amplitude which we find in good agreement with
experiment.
| [
{
"created": "Sat, 30 May 1998 17:43:11 GMT",
"version": "v1"
}
] | 2011-03-17 | [
[
"Hambye",
"T.",
"",
"Dortmund U."
]
] | We analyze long-distance contributions to the K --> pi pi amplitudes relevant for the Delta I = 1/2 selection rule in the framework of the 1/N_c expansion. We use a modified prescription for the identification of meson momenta in the chiral loop corrections to gain a consistent matching with the short-distance part. Our approach involves a separation of non-factorizable and factorizable 1/N_c corrections. Along these lines we calculate the one-loop contributions from the lowest order lagrangian. Our main result is an additional enhancement of the Delta I = 1/2 channel amplitude which we find in good agreement with experiment. |
hep-ph/0412344 | Shaaban Khalil | S. Abel and S. Khalil | EDM constraints and CP asymmetries of B processes in supersymmetric
models | 11 pages, 2 figures | Phys.Lett.B618:201-208,2005 | 10.1016/j.physletb.2005.04.077 | IPPP/04/87, DCPT/04/174 | hep-ph | null | We demonstrate that electric dipole moments (EDMs) strongly constrain
possible SUSY contributions to the CP asymmetries of B processes; LL and/or RR
flavour mixings between second and third generations are severely restricted by
the experimental limit on the mercury EDM, and so therefore are their possible
contributions to the CP asymmetries of B --> \phi K and B --> \eta' K. We find
that SUSY models with dominant LR and RL mixing through non-universal A-terms
is the only way to accommodate the apparent deviation of CP asymmetries from
those expected in the Standard Model without conflicting with the EDM bounds or
with any other experimental results.
| [
{
"created": "Wed, 22 Dec 2004 15:51:02 GMT",
"version": "v1"
}
] | 2014-11-18 | [
[
"Abel",
"S.",
""
],
[
"Khalil",
"S.",
""
]
] | We demonstrate that electric dipole moments (EDMs) strongly constrain possible SUSY contributions to the CP asymmetries of B processes; LL and/or RR flavour mixings between second and third generations are severely restricted by the experimental limit on the mercury EDM, and so therefore are their possible contributions to the CP asymmetries of B --> \phi K and B --> \eta' K. We find that SUSY models with dominant LR and RL mixing through non-universal A-terms is the only way to accommodate the apparent deviation of CP asymmetries from those expected in the Standard Model without conflicting with the EDM bounds or with any other experimental results. |
2201.06664 | Hiromasa Takaura | Yu Hamada, Ryuichiro Kitano, Ryutaro Matsudo, Hiromasa Takaura,
Mitsuhiro Yoshida | $\mu$TRISTAN | 23 pages, 7 figures, version to appear in PTEP | Prog Theor Exp Phys (2022) | 10.1093/ptep/ptac059 | KEK-TH-2385 | hep-ph hep-ex | http://creativecommons.org/licenses/by-nc-nd/4.0/ | The ultra-cold muon technology developed for the muon $g-2$ experiment at
J-PARC provides a low emittance $\mu^+$ beam which can be accelerated and used
for realistic collider experiments. We consider the possibility of new collider
experiments by accelerating the $\mu^+$ beam up to 1 TeV. Allowing the $\mu^+$
beam to collide with a high intensity $e^-$ beam at the TRISTAN energy,
$E_{e^-}= 30$ GeV, in the storage ring with the same size as TRISTAN (the
circumference of 3 km), one can realize a collider experiment with the
center-of-mass energy $\sqrt s = 346$ GeV, which allows productions of the
Higgs bosons through the vector boson fusion processes. We estimate the
deliverable luminosity with existing accelerator technologies to be at the
level of $5 \times 10^{33}$ cm$^{-2}$ s$^{-1}$, with which the collider can be
a good Higgs boson factory. The $\mu^+ \mu^+$ colliders up to $\sqrt s = 2$ TeV
are also possible by using the same storage ring. They have a capability of
producing the superpartner of the muon up to TeV masses.
| [
{
"created": "Mon, 17 Jan 2022 23:26:36 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Apr 2022 05:15:31 GMT",
"version": "v2"
}
] | 2022-05-11 | [
[
"Hamada",
"Yu",
""
],
[
"Kitano",
"Ryuichiro",
""
],
[
"Matsudo",
"Ryutaro",
""
],
[
"Takaura",
"Hiromasa",
""
],
[
"Yoshida",
"Mitsuhiro",
""
]
] | The ultra-cold muon technology developed for the muon $g-2$ experiment at J-PARC provides a low emittance $\mu^+$ beam which can be accelerated and used for realistic collider experiments. We consider the possibility of new collider experiments by accelerating the $\mu^+$ beam up to 1 TeV. Allowing the $\mu^+$ beam to collide with a high intensity $e^-$ beam at the TRISTAN energy, $E_{e^-}= 30$ GeV, in the storage ring with the same size as TRISTAN (the circumference of 3 km), one can realize a collider experiment with the center-of-mass energy $\sqrt s = 346$ GeV, which allows productions of the Higgs bosons through the vector boson fusion processes. We estimate the deliverable luminosity with existing accelerator technologies to be at the level of $5 \times 10^{33}$ cm$^{-2}$ s$^{-1}$, with which the collider can be a good Higgs boson factory. The $\mu^+ \mu^+$ colliders up to $\sqrt s = 2$ TeV are also possible by using the same storage ring. They have a capability of producing the superpartner of the muon up to TeV masses. |
hep-ph/9910486 | Alexander Pankov | A.A. Pankov (Gomel Tech.U. & INFN Trieste) | Prospects on Compositeness and New Vector Bosons at LC with Polarization | 9 pages with 3 figures, Presented at the International Workshop
QFTHEP'99, Moscow, May 27 - June 2, 1999 | null | null | null | hep-ph | null | Fermion compositness, and other new physics which can be described by an
exchange of very massive particles ($Z^\prime$ boson, leptoquarks, sparticles
with R-parity violating couplings), can be manifest itself as the presence of a
strong four-fermion contact interaction. For the processes $e^+e^-\to
\mu^+\mu^-$, $\tau^+\tau^-$, $\bar{b}b$ and $\bar{c}c$ at a future $e^+e^-$
linear collider (LC) with $\sqrt{s}=0.5$ TeV, we examine the sensitivity of the
helicity cross sections to four-fermion contact interactions. If longitudinal
polarization of the electron beam were available, two polarized integrated
cross sections would offer the opportunity to separate the helicity cross
sections and, in this way, to derive model-independent bounds on the relevant
parameters. The measurement of these polarized cross sections with optimal
kinematical cuts could significantly increase the sensitivity of helicity cross
sections to contact interaction parameters and could give crucial information
on the chiral structure of such new interactions. In addition, we consider the
application of the proposed approach to the search for manifestations of a
$Z^\prime$ for typical extended model examples.
| [
{
"created": "Tue, 26 Oct 1999 12:09:47 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Pankov",
"A. A.",
"",
"Gomel Tech.U. & INFN Trieste"
]
] | Fermion compositness, and other new physics which can be described by an exchange of very massive particles ($Z^\prime$ boson, leptoquarks, sparticles with R-parity violating couplings), can be manifest itself as the presence of a strong four-fermion contact interaction. For the processes $e^+e^-\to \mu^+\mu^-$, $\tau^+\tau^-$, $\bar{b}b$ and $\bar{c}c$ at a future $e^+e^-$ linear collider (LC) with $\sqrt{s}=0.5$ TeV, we examine the sensitivity of the helicity cross sections to four-fermion contact interactions. If longitudinal polarization of the electron beam were available, two polarized integrated cross sections would offer the opportunity to separate the helicity cross sections and, in this way, to derive model-independent bounds on the relevant parameters. The measurement of these polarized cross sections with optimal kinematical cuts could significantly increase the sensitivity of helicity cross sections to contact interaction parameters and could give crucial information on the chiral structure of such new interactions. In addition, we consider the application of the proposed approach to the search for manifestations of a $Z^\prime$ for typical extended model examples. |
1401.1806 | Mauricio Martinez | Mauricio Martinez | Coherence effects between the initial and final state radiation in a
dense QCD medium | 8 pages, 1 figure. Plenary contribution to the IS2013 Conference,
September 8-14 2013, Illa da Toxa - Galicia (Spain). Matched with the
published version | Nucl.Phys.A926:242-249,2014 | 10.1016/j.nuclphysa.2014.06.006 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In these proceedings contribution we review our recent results of medium
modifications to the coherence pattern between the initial and final state
radiation. We study single gluon production off a highly energetic parton that
undergoes a hard scattering and subsequently crosses a dense QCD medium of
finite size. Multiple scatterings lead to a partial suppression of the
interferences between different emitters that opens the phase space for large
angle emissions. We briefly discuss the generalization of this setup to
describe gluon production in the case of pA collisions by including finite
length and energy corrections. The configuration studied here may have
phenomenological consequences in high-energy nuclear collisions.
| [
{
"created": "Wed, 8 Jan 2014 20:46:36 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Jun 2014 19:06:19 GMT",
"version": "v2"
}
] | 2014-08-26 | [
[
"Martinez",
"Mauricio",
""
]
] | In these proceedings contribution we review our recent results of medium modifications to the coherence pattern between the initial and final state radiation. We study single gluon production off a highly energetic parton that undergoes a hard scattering and subsequently crosses a dense QCD medium of finite size. Multiple scatterings lead to a partial suppression of the interferences between different emitters that opens the phase space for large angle emissions. We briefly discuss the generalization of this setup to describe gluon production in the case of pA collisions by including finite length and energy corrections. The configuration studied here may have phenomenological consequences in high-energy nuclear collisions. |
hep-ph/0601228 | Christophe Royon | C. Royon | Recent results from the Tevatron | Proceedinds of the Zakopane summer school | Acta Phys.Polon.B36:3697-3722,2005 | null | null | hep-ph | null | In these lectures, we describe some recent results from the D{\O}and CDF
experiments at the Tevatron.
| [
{
"created": "Fri, 27 Jan 2006 11:03:27 GMT",
"version": "v1"
}
] | 2010-04-22 | [
[
"Royon",
"C.",
""
]
] | In these lectures, we describe some recent results from the D{\O}and CDF experiments at the Tevatron. |
1503.07052 | Werner Vogelsang | Felix Ringer, Werner Vogelsang | Single-Spin Asymmetries in W Boson Production at Next-to-Leading Order | 13 pages, 6 figures. Updated figure for comparison to RHIC data.
Version to appear in Phys. Rev. D | Phys. Rev. D 91, 094033 (2015) | 10.1103/PhysRevD.91.094033 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an analytic next-to-leading order QCD calculation of the partonic
cross sections for single-inclusive lepton production in hadronic collisions,
when the lepton originates from the decay of an intermediate electroweak boson
and is produced at high transverse momentum. In particular, we consider the
case of incoming longitudinally polarized protons for which parity-violating
single-spin asymmetries arise that are exploited in the $W$ boson program at
RHIC to constrain the proton's helicity parton distributions. Our calculation
enables a very fast and efficient numerical computation of the relevant spin
asymmetries at RHIC, which is an important ingredient for the inclusion of RHIC
data in a global analysis of nucleon helicity structure. We confirm the
validity of our calculation by comparing with an existing code that treats the
next-to-leading order cross sections entirely numerically by Monte-Carlo
integration techniques. We also provide new comparisons of the present RHIC
data with results for some of the sets of polarized parton distributions
available in the literature.
| [
{
"created": "Tue, 24 Mar 2015 14:14:38 GMT",
"version": "v1"
},
{
"created": "Fri, 22 May 2015 15:36:24 GMT",
"version": "v2"
}
] | 2015-06-03 | [
[
"Ringer",
"Felix",
""
],
[
"Vogelsang",
"Werner",
""
]
] | We present an analytic next-to-leading order QCD calculation of the partonic cross sections for single-inclusive lepton production in hadronic collisions, when the lepton originates from the decay of an intermediate electroweak boson and is produced at high transverse momentum. In particular, we consider the case of incoming longitudinally polarized protons for which parity-violating single-spin asymmetries arise that are exploited in the $W$ boson program at RHIC to constrain the proton's helicity parton distributions. Our calculation enables a very fast and efficient numerical computation of the relevant spin asymmetries at RHIC, which is an important ingredient for the inclusion of RHIC data in a global analysis of nucleon helicity structure. We confirm the validity of our calculation by comparing with an existing code that treats the next-to-leading order cross sections entirely numerically by Monte-Carlo integration techniques. We also provide new comparisons of the present RHIC data with results for some of the sets of polarized parton distributions available in the literature. |
1509.06748 | Andrew J Powell | Joseph P. Conlon, M. C. David Marsh, Andrew J. Powell | Galaxy Cluster Thermal X-Ray Spectra Constrain Axion-Like Particles | 5 pages | Phys. Rev. D 93, 123526 (2016) | 10.1103/PhysRevD.93.123526 | null | hep-ph astro-ph.CO astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Axion-like particles (ALPs) and photons inter-convert in the presence of a
magnetic field. At keV energies in the environment of galaxy clusters, the
conversion probability can become unsuppressed for light ALPs. Conversion of
thermal X-ray photons into ALPs can introduce a step-like feature into the
cluster thermal bremsstrahlung spectrum, and we argue that existing X-ray data
on galaxy clusters should be sufficient to extend bounds on ALPs in the
low-mass region $m_a \lesssim 1 \times 10^{-12}\,{\rm eV}$ down to $M \sim
7\times 10^{11}\, {\rm GeV}$, and that for $10^{11}\, {\rm GeV} < M \lesssim
10^{12}$ GeV light ALPs give rise to interesting and unique observational
signatures that may be probed by existing and upcoming X-ray (and potentially
X-ray polarisation) observations of galaxy clusters.
| [
{
"created": "Tue, 22 Sep 2015 20:14:16 GMT",
"version": "v1"
}
] | 2016-07-06 | [
[
"Conlon",
"Joseph P.",
""
],
[
"Marsh",
"M. C. David",
""
],
[
"Powell",
"Andrew J.",
""
]
] | Axion-like particles (ALPs) and photons inter-convert in the presence of a magnetic field. At keV energies in the environment of galaxy clusters, the conversion probability can become unsuppressed for light ALPs. Conversion of thermal X-ray photons into ALPs can introduce a step-like feature into the cluster thermal bremsstrahlung spectrum, and we argue that existing X-ray data on galaxy clusters should be sufficient to extend bounds on ALPs in the low-mass region $m_a \lesssim 1 \times 10^{-12}\,{\rm eV}$ down to $M \sim 7\times 10^{11}\, {\rm GeV}$, and that for $10^{11}\, {\rm GeV} < M \lesssim 10^{12}$ GeV light ALPs give rise to interesting and unique observational signatures that may be probed by existing and upcoming X-ray (and potentially X-ray polarisation) observations of galaxy clusters. |
hep-ph/0006040 | Masaki Yasue | Teruyuki Kitabayashi and Masaki Yasue | Two-loop Radiative Neutrino Mechanism in an $SU(3)_L\times U(1)_N$ Gauge
Model | with 10 pages, revtex, including 2 figures, accepted for publication
in Phys. Rev. D (with undefined latex citation indices removed) | null | 10.1103/PhysRevD.63.095006 | TOKAI-HEP/TH-0002 | hep-ph | null | By using the $L_e$ - $L_\mu$ - $L_\tau$ symmetry, we construct an
$SU(3)_L\times U(1)_N$ gauge model that provides two-loop radiative neutrino
masses as well as one-loop radiative neutrino masses. The generic smallness of
two-loop neutrino masses leading to $\Delta m^2_\odot$ compared with one-loop
neutrino masses leading to $\Delta m^2_{atm}$ successfully explains $\Delta
m^2_{atm}$ $>>$ $\Delta m^2_{\odot}$ by invoking the $L_e$ - $L_\mu$ - $L_\tau$
breaking. The Higgs scalar ($h^+$) that initiates radiative mechanisms is
unified into a Higgs triplet together with the standard Higgs scalar ($\phi^+$,
$\phi^0$) to form ($\phi^+$, $\phi^0$, $h^+$), which calls for three families
of lepton triplets: ($\nu^i_L$, $\ell^i_L$, $\omega^i_L$) (i = 1,2,3), where
$\omega^i$ denote heavy neutral leptons. The two-loop radiative mechanism is
found possible by introducing a singly charged scalar, which couples to
$\ell^i_R\omega^j_R$ (i,j = 2,3).
| [
{
"created": "Sun, 4 Jun 2000 15:33:23 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Jan 2001 16:22:16 GMT",
"version": "v2"
},
{
"created": "Tue, 23 Jan 2001 03:22:54 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Kitabayashi",
"Teruyuki",
""
],
[
"Yasue",
"Masaki",
""
]
] | By using the $L_e$ - $L_\mu$ - $L_\tau$ symmetry, we construct an $SU(3)_L\times U(1)_N$ gauge model that provides two-loop radiative neutrino masses as well as one-loop radiative neutrino masses. The generic smallness of two-loop neutrino masses leading to $\Delta m^2_\odot$ compared with one-loop neutrino masses leading to $\Delta m^2_{atm}$ successfully explains $\Delta m^2_{atm}$ $>>$ $\Delta m^2_{\odot}$ by invoking the $L_e$ - $L_\mu$ - $L_\tau$ breaking. The Higgs scalar ($h^+$) that initiates radiative mechanisms is unified into a Higgs triplet together with the standard Higgs scalar ($\phi^+$, $\phi^0$) to form ($\phi^+$, $\phi^0$, $h^+$), which calls for three families of lepton triplets: ($\nu^i_L$, $\ell^i_L$, $\omega^i_L$) (i = 1,2,3), where $\omega^i$ denote heavy neutral leptons. The two-loop radiative mechanism is found possible by introducing a singly charged scalar, which couples to $\ell^i_R\omega^j_R$ (i,j = 2,3). |
hep-ph/0606255 | Fizuli A. Mamedov | Fizuli Mamedov | Particle interactions, masses and the symmetry breaking | 5 Pages | null | null | null | hep-ph | null | A possible original $SU(2)_{L} \times SU(2)_{R}$ symmetry of the elementary
particles and the mechanism of its breaking is discussed. It is concluded that
it is the broken symmetry states of the particles which induce the interactions
among the particles.
| [
{
"created": "Sat, 24 Jun 2006 00:02:08 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Mamedov",
"Fizuli",
""
]
] | A possible original $SU(2)_{L} \times SU(2)_{R}$ symmetry of the elementary particles and the mechanism of its breaking is discussed. It is concluded that it is the broken symmetry states of the particles which induce the interactions among the particles. |
2011.07617 | Blessed Ngwenya | B. A. Ngwenya and W. A. Horowitz | B-meson Nuclear Modification Factor and $\mathbf{v_2(p_T)}$ in a
Strongly Coupled Plasma in $\mathbf{Pb+Pb}$ Collisions at
$\mathbf{\sqrt{s_{NN}}=2.76}$ TeV and $\mathbf{\sqrt{s_{NN}}=5.5}$ TeV | 11 pages, 14 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present predictions for the suppression of B-mesons using AdS/CFT
techniques assuming a strongly coupled quark-gluon plasma at
$\sqrt{s_{NN}}=2.76$ TeV for central collisions and $\sqrt{s_{NN}}=5.5$ TeV for
various centrality classes. We provide estimates of the systematic theoretical
uncertainties due to 1) the mapping of QCD parameters to those in $\mathcal N =
4$ SYM and 2) the exact form of the momentum dependence of the diffusion
coefficient predicted by AdS/CFT. We show that coupling energy loss to flow
increases $v_2$ substantially out to surprisingly large momenta, on the order
of $\sim 25$ GeV/c, thus pointing to a possible resolution of the $R_{AA}$ and
$v_2$ puzzle for light hadrons.
| [
{
"created": "Sun, 15 Nov 2020 20:00:19 GMT",
"version": "v1"
}
] | 2020-11-17 | [
[
"Ngwenya",
"B. A.",
""
],
[
"Horowitz",
"W. A.",
""
]
] | We present predictions for the suppression of B-mesons using AdS/CFT techniques assuming a strongly coupled quark-gluon plasma at $\sqrt{s_{NN}}=2.76$ TeV for central collisions and $\sqrt{s_{NN}}=5.5$ TeV for various centrality classes. We provide estimates of the systematic theoretical uncertainties due to 1) the mapping of QCD parameters to those in $\mathcal N = 4$ SYM and 2) the exact form of the momentum dependence of the diffusion coefficient predicted by AdS/CFT. We show that coupling energy loss to flow increases $v_2$ substantially out to surprisingly large momenta, on the order of $\sim 25$ GeV/c, thus pointing to a possible resolution of the $R_{AA}$ and $v_2$ puzzle for light hadrons. |
1012.0267 | Carlo Giunti Dr. | Carlo Giunti, Marco Laveder | Large Short-Baseline antinu_mu Disappearance | 6 pages; final version published in Phys.Rev.D 83 (2011) 053006 | Phys.Rev.D83:053006,2011 | 10.1103/PhysRevD.83.053006 | null | hep-ph astro-ph.CO hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the LSND, KARMEN and MiniBooNE data on short-baseline antinu_mu ->
antinu_e oscillations and the data on short-baseline antinu_e disappearance
obtained in the Bugey-3 and CHOOZ reactor experiments in the framework of 3+1
antineutrino mixing, taking into account the MINOS observation of long-baseline
antinu_mu disappearance and the KamLAND observation of very-long-baseline
antinu_e disappearance. We show that the fit of the data implies that the
short-baseline disappearance of antinu_mu is relatively large. We obtain a
prediction of an effective amplitude sin^2 2 theta_{mu mu} >~ 0.1 for
short-baseline antinu_mu disappearance generated by 0.2 <~ Delta m^2 <~ 1 eV^2,
which could be measured in future experiments.
| [
{
"created": "Wed, 1 Dec 2010 18:20:58 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Feb 2011 12:05:37 GMT",
"version": "v2"
},
{
"created": "Fri, 25 Mar 2011 16:19:00 GMT",
"version": "v3"
}
] | 2011-03-28 | [
[
"Giunti",
"Carlo",
""
],
[
"Laveder",
"Marco",
""
]
] | We analyze the LSND, KARMEN and MiniBooNE data on short-baseline antinu_mu -> antinu_e oscillations and the data on short-baseline antinu_e disappearance obtained in the Bugey-3 and CHOOZ reactor experiments in the framework of 3+1 antineutrino mixing, taking into account the MINOS observation of long-baseline antinu_mu disappearance and the KamLAND observation of very-long-baseline antinu_e disappearance. We show that the fit of the data implies that the short-baseline disappearance of antinu_mu is relatively large. We obtain a prediction of an effective amplitude sin^2 2 theta_{mu mu} >~ 0.1 for short-baseline antinu_mu disappearance generated by 0.2 <~ Delta m^2 <~ 1 eV^2, which could be measured in future experiments. |
2103.08222 | Ali Osman Acar | Ali Osman Acar, Osman Emre Delialioglu, Saleh Sultansoy | A search for the first generation charged vector-like leptons at future
colliders | arXiv admin note: text overlap with arXiv:1801.03927 | null | null | null | hep-ph hep-ex | http://creativecommons.org/licenses/by-nc-sa/4.0/ | Flavor Democracy Hypothesis favors existence of iso-singlet quarks and
vector-like charged leptons. Their observation at future colliders could shed
light on the nature of mass and mixing patterns of known leptons and quarks, as
well as Higgs boson itself. Vector-like quarks are extensively searched by
ATLAS and CMS collaborations. Unfortunately, this is not the case for
vector-like leptons, while they have actually similar status from phenomenology
viewpoint. We argue that vector-like charged leptons should be included into
the new physics search programs of future energy frontier colliders. It is
shown that pair production at the HE-LHC with decay of one of the leptons to Ze
and another to He channel, followed by H \rightarrow bb and Z \rightarrow
\mu\mu decays will give opportunity to scan masses of iso-singlet and
iso-doublet charged leptons up to 0.9 TeV and 1.5 TeV, respectively. FCC will
extend this region up to 2 TeV for iso-singlet and 3.6 TeV for iso-doublet
charged leptons.
| [
{
"created": "Mon, 15 Mar 2021 09:09:56 GMT",
"version": "v1"
}
] | 2021-03-16 | [
[
"Acar",
"Ali Osman",
""
],
[
"Delialioglu",
"Osman Emre",
""
],
[
"Sultansoy",
"Saleh",
""
]
] | Flavor Democracy Hypothesis favors existence of iso-singlet quarks and vector-like charged leptons. Their observation at future colliders could shed light on the nature of mass and mixing patterns of known leptons and quarks, as well as Higgs boson itself. Vector-like quarks are extensively searched by ATLAS and CMS collaborations. Unfortunately, this is not the case for vector-like leptons, while they have actually similar status from phenomenology viewpoint. We argue that vector-like charged leptons should be included into the new physics search programs of future energy frontier colliders. It is shown that pair production at the HE-LHC with decay of one of the leptons to Ze and another to He channel, followed by H \rightarrow bb and Z \rightarrow \mu\mu decays will give opportunity to scan masses of iso-singlet and iso-doublet charged leptons up to 0.9 TeV and 1.5 TeV, respectively. FCC will extend this region up to 2 TeV for iso-singlet and 3.6 TeV for iso-doublet charged leptons. |
hep-ph/0311114 | Gideon Alexander | Gideon Alexander | Open Questions Related to Bose-Einstein Correlations in e+ e- -->
Hadrons | Invited talk given at the ISMD2003, 5-11 September 2003, Krakow,
Poland | Acta Phys.Polon. B35 (2004) 69-76 | null | Tel-Aviv University Report TAUP-2750-03 | hep-ph | null | Questions concerning the Bose-Einstein (BEC) and Fermi-Dirac (FDC)
correlations of hadrons produced in $e^+e^-$ collisions are discussed. Among
them the emitter dimension $r$ as a function of $\sqrt{s_{ee}}$ and the hadron
mass, the extension of the BEC by including isospin invariance and the proposed
relation between $r$ and the inter-atomic separation in Bose condensates.
| [
{
"created": "Mon, 10 Nov 2003 09:30:02 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Alexander",
"Gideon",
""
]
] | Questions concerning the Bose-Einstein (BEC) and Fermi-Dirac (FDC) correlations of hadrons produced in $e^+e^-$ collisions are discussed. Among them the emitter dimension $r$ as a function of $\sqrt{s_{ee}}$ and the hadron mass, the extension of the BEC by including isospin invariance and the proposed relation between $r$ and the inter-atomic separation in Bose condensates. |
1509.07407 | Gabor Cynolter | G. Cynolter and E. Lendvai | Cutoff Regularization Method in Gauge Theories | 22 pages, 3 figures. arXiv admin note: substantial text overlap with
arXiv:1002.4490, arXiv:1012.4648 | null | null | ITP-Budapest 665 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A Lorentz and gauge symmetry preserving regularization method is discussed in
four dimension based on momentum cutoff. We use the conditions of gauge
invariance or equivalently the freedom of shift of the loop momentum to define
the evaluation of the terms carrying even number of Lorentz indices, e.g.
proportional to $k_{\mu}k_{\nu}$. The remaining scalar integrals are calculated
with a four dimensional momentum cutoff. The finite terms (independent of the
cutoff) are free of ambiguities coming from subtractions in non-trivial cases.
Finite parts of the result are equal with the results of dimensional
regularization. The proposed method can be applied to various physical
processes where the use of dimensional regularization is subtle or a physical
cutoff is present. As a famous example it is shown that the triangle anomaly
can be calculated unambiguously with this new improved cutoff.
| [
{
"created": "Thu, 24 Sep 2015 15:33:58 GMT",
"version": "v1"
}
] | 2015-09-25 | [
[
"Cynolter",
"G.",
""
],
[
"Lendvai",
"E.",
""
]
] | A Lorentz and gauge symmetry preserving regularization method is discussed in four dimension based on momentum cutoff. We use the conditions of gauge invariance or equivalently the freedom of shift of the loop momentum to define the evaluation of the terms carrying even number of Lorentz indices, e.g. proportional to $k_{\mu}k_{\nu}$. The remaining scalar integrals are calculated with a four dimensional momentum cutoff. The finite terms (independent of the cutoff) are free of ambiguities coming from subtractions in non-trivial cases. Finite parts of the result are equal with the results of dimensional regularization. The proposed method can be applied to various physical processes where the use of dimensional regularization is subtle or a physical cutoff is present. As a famous example it is shown that the triangle anomaly can be calculated unambiguously with this new improved cutoff. |
hep-ph/0405227 | Seung-Il Nam | Seung-Il Nam, Atsushi Hosaka and Hyun-Chul Kim | Production of the pentaquark exotic baryon Xi_5 in bar{K} N scattering :
bar{K} N -> K Xi_5 and bar{K} N -> K* Xi_5 | 8 pages and 15 figures | J.Korean Phys.Soc.52:561-567,2008 | 10.3938/jkps.52.561 | PNU-NTG-07/2004 and PNU-NURI-06/2004 | hep-ph nucl-th | null | We investigate the production of the newly found pentaquark exotic baryon
Xi_5 in the bar{K} N -> K Xi_5 and the bar{K} N -> K* Xi_5 reactions at the
tree level. We consider both positive- and negative parities of the Xi_5. The
reactions are dominated by the s- and u-channel processes, and the resulting
cross sections depend very much on the parity of Xi_5 and on the type of form
factor. We have seen that the cross sections for the positive-parity Xi_5 are
generally about a hundred times larger than those of the negative-parity one.
This large difference in the cross sections will be useful for further study of
pentaquark baryons.
| [
{
"created": "Mon, 24 May 2004 09:41:13 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Jan 2008 01:58:24 GMT",
"version": "v2"
}
] | 2011-08-31 | [
[
"Nam",
"Seung-Il",
""
],
[
"Hosaka",
"Atsushi",
""
],
[
"Kim",
"Hyun-Chul",
""
]
] | We investigate the production of the newly found pentaquark exotic baryon Xi_5 in the bar{K} N -> K Xi_5 and the bar{K} N -> K* Xi_5 reactions at the tree level. We consider both positive- and negative parities of the Xi_5. The reactions are dominated by the s- and u-channel processes, and the resulting cross sections depend very much on the parity of Xi_5 and on the type of form factor. We have seen that the cross sections for the positive-parity Xi_5 are generally about a hundred times larger than those of the negative-parity one. This large difference in the cross sections will be useful for further study of pentaquark baryons. |
2406.19447 | Yong Xu | Nicol\'as Bernal, Julia Harz, Martin A. Mojahed, Yong Xu | Graviton- and Inflaton-mediated Dark Matter Production after Large Field
Polynomial Inflation | 22 pages, 6 figures | null | null | MITP-24-056 | hep-ph astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | Polynomial inflation is a simple cosmological scenario, which fits the cosmic
microwave background data well. It provides testable predictions for the
tensor-to-scalar ratio and the running of the spectral index. In this work, we
investigate the production of Dirac dark matter (DM) within the framework of
large-field polynomial inflation. We study all relevant production channels
including $i$) non-thermal production through inflaton decays and scatterings,
and $ii$) thermal production from scattering of standard model particles
mediated by inflatons and gravitons. In contrast to small-field polynomial
inflation, where inflaton decay dominates DM production, we find that
graviton-mediated processes can be dominant in the large-field scenario. In
particular, graviton-mediated scatterings can account for the observed relic
abundance even when DM is up to one order of magnitude heavier than the
inflaton. For DM lighter than the inflaton, we demonstrate that the interplay
between graviton- and inflaton-mediated production channels give rise to
non-trivial relations between the DM mass and the reheating temperature
required to account for the DM relic abundance.
| [
{
"created": "Thu, 27 Jun 2024 18:00:01 GMT",
"version": "v1"
}
] | 2024-07-01 | [
[
"Bernal",
"Nicolás",
""
],
[
"Harz",
"Julia",
""
],
[
"Mojahed",
"Martin A.",
""
],
[
"Xu",
"Yong",
""
]
] | Polynomial inflation is a simple cosmological scenario, which fits the cosmic microwave background data well. It provides testable predictions for the tensor-to-scalar ratio and the running of the spectral index. In this work, we investigate the production of Dirac dark matter (DM) within the framework of large-field polynomial inflation. We study all relevant production channels including $i$) non-thermal production through inflaton decays and scatterings, and $ii$) thermal production from scattering of standard model particles mediated by inflatons and gravitons. In contrast to small-field polynomial inflation, where inflaton decay dominates DM production, we find that graviton-mediated processes can be dominant in the large-field scenario. In particular, graviton-mediated scatterings can account for the observed relic abundance even when DM is up to one order of magnitude heavier than the inflaton. For DM lighter than the inflaton, we demonstrate that the interplay between graviton- and inflaton-mediated production channels give rise to non-trivial relations between the DM mass and the reheating temperature required to account for the DM relic abundance. |
hep-ph/9811440 | Thomas G. Rizzo | Thomas G. Rizzo | Distinguishing Indirect Signatures of New Physics at the NLC: Z' Versus
R-Parity Violation | 31 pages, 11 Figs, LaTex, discussion extended, refs updated, typos
corrected | Phys.Rev. D59 (1999) 113004 | 10.1103/PhysRevD.59.113004 | SLAC-PUB-7982 | hep-ph | null | R-parity violation and extensions of the Standard Model gauge structure offer
two non-minimal realizations of supersymmetry at low energies that can lead to
similar new physics signatures at existing and future colliders. We discuss
techniques that can be employed at the NLC below direct production threshold to
distinguish these two new physics scenarios.
| [
{
"created": "Mon, 23 Nov 1998 16:47:30 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Jan 1999 20:43:20 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Rizzo",
"Thomas G.",
""
]
] | R-parity violation and extensions of the Standard Model gauge structure offer two non-minimal realizations of supersymmetry at low energies that can lead to similar new physics signatures at existing and future colliders. We discuss techniques that can be employed at the NLC below direct production threshold to distinguish these two new physics scenarios. |
0907.5316 | Isaac Vidana | C.E. Jimenez-Tejero, A. Ramos and I. Vidana | Dynamically generated open charmed baryons beyond the zero range
approximation | 7 figures, 8 tables | Phys.Rev.C80:055206,2009 | 10.1103/PhysRevC.80.055206 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The interaction of the low lying pseudo-scalar mesons with the ground state
baryons in the charm sector is studied within a coupled channel approach using
a t-channel vector-exchange driving force. The amplitudes describing the
scattering of the pseudo-scalar mesons off the ground-state baryons are
obtained by solving the Lippmann--Schwinger equation. We analyze in detail the
effects of going beyond the $t=0$ approximation. Our model predicts the
dynamical generation of several open charmed baryon resonances in different
isospin and strangeness channels, some of which can be clearly identified with
recently observed states.
| [
{
"created": "Thu, 30 Jul 2009 11:49:50 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Nov 2009 15:34:26 GMT",
"version": "v2"
}
] | 2010-12-01 | [
[
"Jimenez-Tejero",
"C. E.",
""
],
[
"Ramos",
"A.",
""
],
[
"Vidana",
"I.",
""
]
] | The interaction of the low lying pseudo-scalar mesons with the ground state baryons in the charm sector is studied within a coupled channel approach using a t-channel vector-exchange driving force. The amplitudes describing the scattering of the pseudo-scalar mesons off the ground-state baryons are obtained by solving the Lippmann--Schwinger equation. We analyze in detail the effects of going beyond the $t=0$ approximation. Our model predicts the dynamical generation of several open charmed baryon resonances in different isospin and strangeness channels, some of which can be clearly identified with recently observed states. |
1505.02022 | Cheuk-Yin Wong | Cheuk-Yin Wong, Grzegorz Wilk, Leonardo J.L. Cirto, Constantino
Tsallis | From QCD-based hard-scattering to nonextensive statistical mechanical
descriptions of transverse momentum spectra in high-energy $pp$ and $p\bar p$
collisions | 15 pages, 8 figures | Phys. Rev. D91 114027 (2015) | 10.1103/PhysRevD.91.114027 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Transverse spectra of both jets and hadrons obtained in high-energy $pp$ and
$p\bar p $ collisions at central rapidity exhibit power-law behavior of
$1/p_T^n$ at high $p_T$. The power index $n$ is 4-5 for jet production and is
6-10 for hadron production. Furthermore, the hadron spectra spanning over 14
orders of magnitude down to the lowest $p_T$ region in $pp$ collisions at LHC
can be adequately described by a single nonextensive statistical mechanical
distribution that is widely used in other branches of science. This suggests
indirectly the possible dominance of the hard-scattering process over
essentially the whole $p_T$ region at central rapidity in high-energy $pp$ and
$p \bar p$ collisions. We show here direct evidences of such a dominance of the
hard-scattering process by investigating the power indices of UA1 and ATLAS jet
spectra over an extended $p_T$ region and the two-particle correlation data of
the STAR and PHENIX Collaborations in high-energy $pp$ and $p \bar p$
collisions at central rapidity. We then study how the showering of the
hard-scattering product partons alters the power index of the hadron spectra
and leads to a hadron distribution that may be cast into a single-particle
nonextensive statistical mechanical distribution. Because of such a connection,
the nonextensive statistical mechanical distribution may be considered as a
lowest-order approximation of the hard-scattering of partons followed by the
subsequent process of parton showering that turns the jets into hadrons, in
high energy $pp$ and $p\bar p$ collisions.
| [
{
"created": "Fri, 8 May 2015 13:00:48 GMT",
"version": "v1"
}
] | 2015-06-24 | [
[
"Wong",
"Cheuk-Yin",
""
],
[
"Wilk",
"Grzegorz",
""
],
[
"Cirto",
"Leonardo J. L.",
""
],
[
"Tsallis",
"Constantino",
""
]
] | Transverse spectra of both jets and hadrons obtained in high-energy $pp$ and $p\bar p $ collisions at central rapidity exhibit power-law behavior of $1/p_T^n$ at high $p_T$. The power index $n$ is 4-5 for jet production and is 6-10 for hadron production. Furthermore, the hadron spectra spanning over 14 orders of magnitude down to the lowest $p_T$ region in $pp$ collisions at LHC can be adequately described by a single nonextensive statistical mechanical distribution that is widely used in other branches of science. This suggests indirectly the possible dominance of the hard-scattering process over essentially the whole $p_T$ region at central rapidity in high-energy $pp$ and $p \bar p$ collisions. We show here direct evidences of such a dominance of the hard-scattering process by investigating the power indices of UA1 and ATLAS jet spectra over an extended $p_T$ region and the two-particle correlation data of the STAR and PHENIX Collaborations in high-energy $pp$ and $p \bar p$ collisions at central rapidity. We then study how the showering of the hard-scattering product partons alters the power index of the hadron spectra and leads to a hadron distribution that may be cast into a single-particle nonextensive statistical mechanical distribution. Because of such a connection, the nonextensive statistical mechanical distribution may be considered as a lowest-order approximation of the hard-scattering of partons followed by the subsequent process of parton showering that turns the jets into hadrons, in high energy $pp$ and $p\bar p$ collisions. |
hep-ph/9311363 | Stefan Dittmaier | S.Dittmaier | Full O(alpha) Radiative Corrections to High-Energy Compton Scattering | 20 pages, LaTex (uuencoded figures appended on tex-file), Bi-TP 93/61 | Nucl.Phys. B423 (1994) 384-404 | 10.1016/0550-3213(94)90139-2 | null | hep-ph | null | Using computer-algebraic methods we derive compact analytical expressions for
the virtual electroweak radiative corrections to polarized Compton scattering.
Moreover the helicity amplitudes for double Compton scattering, which prove to
be extremely simple in terms of Weyl-van der Waerden spinor products, are
presented for massless electrons. The inclusion of a finite electron mass is
described, too. Finally numerical results both for the purely photonic and the
full O(alpha) electroweak corrections, which turn out to be of the order of
5-10%, are discussed for energies ranging from 10GeV to 2TeV.
| [
{
"created": "Thu, 25 Nov 1993 13:39:58 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Dittmaier",
"S.",
""
]
] | Using computer-algebraic methods we derive compact analytical expressions for the virtual electroweak radiative corrections to polarized Compton scattering. Moreover the helicity amplitudes for double Compton scattering, which prove to be extremely simple in terms of Weyl-van der Waerden spinor products, are presented for massless electrons. The inclusion of a finite electron mass is described, too. Finally numerical results both for the purely photonic and the full O(alpha) electroweak corrections, which turn out to be of the order of 5-10%, are discussed for energies ranging from 10GeV to 2TeV. |
hep-ph/9408362 | null | Charles B. Chiu and Duane A. Dicus | Dips in Partial Wave Amplitudes from Final State Interactions | 9 pages, CPP-93-21, 6 figures not included | Phys.Rev. D50 (1994) 6724-6729 | 10.1103/PhysRevD.50.6724 | null | hep-ph | null | We consider the dip-peak structures in the J=0 partial wave amplitudes for
processes $\gamma\gamma\rightarrow W^+W^-~
\mbox{and}~\gamma\gamma,gg\rightarrow t\overline{t}$ taking into account the
corresponding Born term process and the rescattering process where the
intermediate state is rescattered through the exchange of Higgs resonance state
in the direct channel.
| [
{
"created": "Wed, 24 Aug 1994 19:23:18 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Chiu",
"Charles B.",
""
],
[
"Dicus",
"Duane A.",
""
]
] | We consider the dip-peak structures in the J=0 partial wave amplitudes for processes $\gamma\gamma\rightarrow W^+W^-~ \mbox{and}~\gamma\gamma,gg\rightarrow t\overline{t}$ taking into account the corresponding Born term process and the rescattering process where the intermediate state is rescattered through the exchange of Higgs resonance state in the direct channel. |
1510.07265 | Daniel Cabrera | Daniel Cabrera, Laura Tolos, J\"org Aichelin and Elena bratkovskaya | Strange meson-baryon interaction in hot and dense medium: recent
progress for a road to GSI/FAIR | 4 pages, 2 figures. To be published in the Proceedings of the 15th
International Conference on Strangeness in Quark Matter (SQM2015), 6-11 July
2015, JINR, Dubna, Russia | null | 10.1088/1742-6596/668/1/012048 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report recent results on the dynamics of strange hadrons in two-body
reactions relevant for near-threshold production in heavy-ion collisions at
GSI/FAIR and NICA-Dubna. In particular, $\bar K N$ scattering in hot and dense
nuclear matter is studied within a chiral unitary framework in coupled
channels, setting up the starting point for implementations in microscopic
off-shell transport approaches. We focus on the calculation of transition rates
with special attention to the excitation of hyperon resonances and isospin
effects. Additionally, we explore "unconventional" strangeness generation by
meson-meson and meson-baryon interactions in connection with recent HADES
observations of deep sub-threshold $\phi$ and $\Xi$ production.
| [
{
"created": "Sun, 25 Oct 2015 16:39:19 GMT",
"version": "v1"
}
] | 2016-02-17 | [
[
"Cabrera",
"Daniel",
""
],
[
"Tolos",
"Laura",
""
],
[
"Aichelin",
"Jörg",
""
],
[
"bratkovskaya",
"Elena",
""
]
] | We report recent results on the dynamics of strange hadrons in two-body reactions relevant for near-threshold production in heavy-ion collisions at GSI/FAIR and NICA-Dubna. In particular, $\bar K N$ scattering in hot and dense nuclear matter is studied within a chiral unitary framework in coupled channels, setting up the starting point for implementations in microscopic off-shell transport approaches. We focus on the calculation of transition rates with special attention to the excitation of hyperon resonances and isospin effects. Additionally, we explore "unconventional" strangeness generation by meson-meson and meson-baryon interactions in connection with recent HADES observations of deep sub-threshold $\phi$ and $\Xi$ production. |
1005.5001 | James Cline | James M. Cline | Excited Dark Matter versus PAMELA/Fermi | 4 pages, presented at Moriond Cosmology 2010 | null | null | CERN-PH-TH/2010-101 | hep-ph astro-ph.CO astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Excitation of multicomponent dark matter in the galactic center has been
proposed as the source of low-energy positrons that produce the excess 511 keV
gamma rays that have been observed by INTEGRAL. Such models have also been
promoted to explain excess high-energy electrons/positrons observed by the
PAMELA, Fermi/LAT and H.E.S.S. experiments. We investigate whether one model
can simultaneously fit all three anomalies, in addition to further constraints
from inverse Compton scattering by the high-energy leptons. We find models that
fit both the 511 keV and PAMELA excesses at dark matter masses M < 400 GeV, but
not the Fermi lepton excess. The conflict arises because a more cuspy DM halo
profile is needed to match the observed 511 keV signal than is compatible with
inverse Compton constraints at larger DM masses.
| [
{
"created": "Thu, 27 May 2010 08:04:54 GMT",
"version": "v1"
}
] | 2010-05-28 | [
[
"Cline",
"James M.",
""
]
] | Excitation of multicomponent dark matter in the galactic center has been proposed as the source of low-energy positrons that produce the excess 511 keV gamma rays that have been observed by INTEGRAL. Such models have also been promoted to explain excess high-energy electrons/positrons observed by the PAMELA, Fermi/LAT and H.E.S.S. experiments. We investigate whether one model can simultaneously fit all three anomalies, in addition to further constraints from inverse Compton scattering by the high-energy leptons. We find models that fit both the 511 keV and PAMELA excesses at dark matter masses M < 400 GeV, but not the Fermi lepton excess. The conflict arises because a more cuspy DM halo profile is needed to match the observed 511 keV signal than is compatible with inverse Compton constraints at larger DM masses. |
hep-ph/9810379 | Keum Yong-Yeon | Y. M. Cho and Y.-Y. Keum | Dilatonic Dark Matter | 12 pages, 1 figure. Published in Mod. Phys. Lett A13 (1998) 109-117.
This essay received an "honorable mention" from the Gravity Research
Foundation, 1997 | Mod.Phys.Lett. A13 (1998) 109-117 | 10.1142/S0217732398000152 | APCTP/97-01 (revised) | hep-ph | null | We study the possibility that the dilaton plays the role of the dark matter
of the universe. We find that the condition for the dilaton to be the dark
matter of the universe strongly restricts its mass to be around 0.5 keV or 270
MeV. For the other mass ranges, the dilaton either undercloses or overcloses
the universe. The 0.5 keV dilaton has the free-streaming distance of about 1.4
Mpc and becomes an excellent candidate of a warm dark matter, while the 270 MeV
one has the free-streaming distance of about 7.4 pc and becomes a cold dark
matter. We discuss the possible ways to detect the dilaton experimentally.
| [
{
"created": "Fri, 16 Oct 1998 04:07:42 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Cho",
"Y. M.",
""
],
[
"Keum",
"Y. -Y.",
""
]
] | We study the possibility that the dilaton plays the role of the dark matter of the universe. We find that the condition for the dilaton to be the dark matter of the universe strongly restricts its mass to be around 0.5 keV or 270 MeV. For the other mass ranges, the dilaton either undercloses or overcloses the universe. The 0.5 keV dilaton has the free-streaming distance of about 1.4 Mpc and becomes an excellent candidate of a warm dark matter, while the 270 MeV one has the free-streaming distance of about 7.4 pc and becomes a cold dark matter. We discuss the possible ways to detect the dilaton experimentally. |
1510.05907 | Enis Yazici | E. Yazici, H. Sundu, E. Veli Veliev | $ B_c B_c J/\psi $ Vertex Form Factor at Finite Temperature in the
Framework of QCD Sum Rules Approach | 8 pages, 7 figures | Eur. Phys. J. C (2016) 76:89 | 10.1140/epjc/s10052-016-3929-8 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The strong form factor of the $B_{c} B_{c}J/\Psi$ vertex is calculated in the
framework of the QCD sum rules method at finite temperature. Taking into
account additional operators appearing at finite temperature, thermal Wilson
expansion is obtained and QCD sum rules are derived. While increasing
temperature, the strong form factor remains unchanged up to $T\simeq100~MeV$
but slightly increases after this point. After $T\simeq160~MeV$, the form
factor suddenly decreases up to $T\simeq170~MeV$. The obtained result of the
coupling constant by fitting the form factor at $Q^2=-m^2_{offshell}$ at $T=0$
is in a very good agreement with the QCD sum rules calculations at vacuum. Our
prediction can be checked in the future experiments.
| [
{
"created": "Tue, 20 Oct 2015 14:18:07 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Jan 2016 09:13:36 GMT",
"version": "v2"
}
] | 2016-10-28 | [
[
"Yazici",
"E.",
""
],
[
"Sundu",
"H.",
""
],
[
"Veliev",
"E. Veli",
""
]
] | The strong form factor of the $B_{c} B_{c}J/\Psi$ vertex is calculated in the framework of the QCD sum rules method at finite temperature. Taking into account additional operators appearing at finite temperature, thermal Wilson expansion is obtained and QCD sum rules are derived. While increasing temperature, the strong form factor remains unchanged up to $T\simeq100~MeV$ but slightly increases after this point. After $T\simeq160~MeV$, the form factor suddenly decreases up to $T\simeq170~MeV$. The obtained result of the coupling constant by fitting the form factor at $Q^2=-m^2_{offshell}$ at $T=0$ is in a very good agreement with the QCD sum rules calculations at vacuum. Our prediction can be checked in the future experiments. |
hep-ph/9407244 | Bob Holdom | B. Holdom | A Dynamical Origin for the Top Mass | 10 pages, LaTeX, NSF-ITP-94-68 | Phys.Lett. B336 (1994) 85-90 | 10.1016/0370-2693(94)00985-6 | null | hep-ph | null | We describe a dynamical scheme by which isospin breaking feeds strongly into
the $t$ and $b$ masses and not into the $W$ and $Z$ masses. The third family
feels a new gauge interaction broken close to a TeV.
| [
{
"created": "Wed, 6 Jul 1994 19:24:56 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Holdom",
"B.",
""
]
] | We describe a dynamical scheme by which isospin breaking feeds strongly into the $t$ and $b$ masses and not into the $W$ and $Z$ masses. The third family feels a new gauge interaction broken close to a TeV. |
1209.0918 | Nodoka Yamanaka | Nodoka Yamanaka, Toru Sato, Takahiro Kubota | R-parity violating supersymmetric contributions to the neutron beta
decay at the one-loop level | 13 pages, 6 figures, minor corrections | Phys.Rev. D86 (2012) 075032 | 10.1103/PhysRevD.86.075032 | OU-HET 758 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The contribution of the R-parity violating minimal supersymmetric standard
model to the neutron beta decay at the one-loop level is investigated. It is
found that the baryon number and R-parity violating interactions contribute to
the D correlation through one-loop corrections, while the tree level prediction
is vanishing. The Fierz interference term is also investigated at the one-loop
level by considering the lepton number and R-parity violating interactions. We
show that future experimental progress can provide us with better constraints
on some of the combinations of R-parity violating couplings.
| [
{
"created": "Wed, 5 Sep 2012 10:31:04 GMT",
"version": "v1"
},
{
"created": "Wed, 31 Oct 2012 18:39:58 GMT",
"version": "v2"
}
] | 2012-11-01 | [
[
"Yamanaka",
"Nodoka",
""
],
[
"Sato",
"Toru",
""
],
[
"Kubota",
"Takahiro",
""
]
] | The contribution of the R-parity violating minimal supersymmetric standard model to the neutron beta decay at the one-loop level is investigated. It is found that the baryon number and R-parity violating interactions contribute to the D correlation through one-loop corrections, while the tree level prediction is vanishing. The Fierz interference term is also investigated at the one-loop level by considering the lepton number and R-parity violating interactions. We show that future experimental progress can provide us with better constraints on some of the combinations of R-parity violating couplings. |
0705.3802 | Alexander Lenz | Alexander Lenz | Theoretical status of $B_s$-mixing and lifetimes of heavy hadrons | 6 pages, invited talk at Hadron Collider Physics Symposium 2007, La
Biodola, Isola d'Elba, Italy, misprints in Note added corrected | Nucl.Phys.Proc.Suppl.177-178:81-86,2008 | 10.1016/j.nuclphysbps.2007.11.089 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review the theoretical status of the lifetime ratios $\tau_{B^+} /
\tau_{B_d}$, $\tau_{B_s} / \tau_{B_d}$, $\tau_{\Lambda_b} / \tau_{B_d}$ and
$\tau_{B_c}$ and of the mixing quantities $\Delta M_s$, $\Delta \Gamma_s$ and
$\phi_s$. $\Delta M_s$ and $\Delta \Gamma_s$ suffer from large uncertainties
due to the badly known decay constants, while the ratio $\Delta \Gamma_s /
\Delta M_s$ can be determined with almost no non-perturbative uncertainties,
therefore it can be used perfectly to find possible new physics contributions
in the mixing parameters. We suggest a very clear method of visualizing the
bounds on new physics and demonstrate this by combining the latest experimental
numbers on the mixing quantities quantities with theory - one already gets some
hints for new physics contributions, but more precise experimental numbers are
needed to draw some definite conclusions. We conclude with a ranking list of
all the discussed quantities according to their current theoretical
uncertainties and point out possible improvements.
| [
{
"created": "Fri, 25 May 2007 16:08:56 GMT",
"version": "v1"
},
{
"created": "Mon, 28 May 2007 12:02:54 GMT",
"version": "v2"
},
{
"created": "Sun, 1 Jul 2012 16:47:34 GMT",
"version": "v3"
}
] | 2012-07-03 | [
[
"Lenz",
"Alexander",
""
]
] | We review the theoretical status of the lifetime ratios $\tau_{B^+} / \tau_{B_d}$, $\tau_{B_s} / \tau_{B_d}$, $\tau_{\Lambda_b} / \tau_{B_d}$ and $\tau_{B_c}$ and of the mixing quantities $\Delta M_s$, $\Delta \Gamma_s$ and $\phi_s$. $\Delta M_s$ and $\Delta \Gamma_s$ suffer from large uncertainties due to the badly known decay constants, while the ratio $\Delta \Gamma_s / \Delta M_s$ can be determined with almost no non-perturbative uncertainties, therefore it can be used perfectly to find possible new physics contributions in the mixing parameters. We suggest a very clear method of visualizing the bounds on new physics and demonstrate this by combining the latest experimental numbers on the mixing quantities quantities with theory - one already gets some hints for new physics contributions, but more precise experimental numbers are needed to draw some definite conclusions. We conclude with a ranking list of all the discussed quantities according to their current theoretical uncertainties and point out possible improvements. |
hep-ph/9610219 | Lubov Vassilevskaya | A.A. Gvozdev, N.V. Mikheev and L.A. Vassilevskaya | The radiative decay of the massive neutrino in the external
electromagnetic fields | 33 pages, latex, 3 ps-figures. To be published in Phys. Rev., V. D54 | Phys.Rev.D54:5674-5685,1996 | 10.1103/PhysRevD.54.5674 | YARU-HE-96/02 | hep-ph | null | The radiative decay of the massive neutrino $\nu_i \rightarrow \nu_j \gamma$
is investigated in the framework of the Standard Model in external
electromagnetic fields of various configurations: constant crossed field,
constant uniform magnetic field, plane monochromatic wave's field. The effect
of significant enhancement of the neutrino decay probability by the external
field (electromagnetic catalysis) is discussed. An especially strong
enhancement occurs in the case of the ultrarelativistic neutrino decay, since
in this case the decay probability does not contain suppression caused by the
smallness of the decaying neutrino mass. The ultrarelativistic neutrino decay
catalysis is significant even in a relatively weak external field ($F/F_e <<
1$, where $F_e$ is the critical Schwinger value). The expression for the photon
splitting probability into the neutrino pair $\gamma \rightarrow \nu_i
\bar\nu_j$ in the wave field is given. The estimations of a number of
gamma-quanta produced in a volume filled with an electromagnetic field and the
neutrino lifetime in a strong magnetic field are presented.
| [
{
"created": "Wed, 2 Oct 1996 15:33:18 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Gvozdev",
"A. A.",
""
],
[
"Mikheev",
"N. V.",
""
],
[
"Vassilevskaya",
"L. A.",
""
]
] | The radiative decay of the massive neutrino $\nu_i \rightarrow \nu_j \gamma$ is investigated in the framework of the Standard Model in external electromagnetic fields of various configurations: constant crossed field, constant uniform magnetic field, plane monochromatic wave's field. The effect of significant enhancement of the neutrino decay probability by the external field (electromagnetic catalysis) is discussed. An especially strong enhancement occurs in the case of the ultrarelativistic neutrino decay, since in this case the decay probability does not contain suppression caused by the smallness of the decaying neutrino mass. The ultrarelativistic neutrino decay catalysis is significant even in a relatively weak external field ($F/F_e << 1$, where $F_e$ is the critical Schwinger value). The expression for the photon splitting probability into the neutrino pair $\gamma \rightarrow \nu_i \bar\nu_j$ in the wave field is given. The estimations of a number of gamma-quanta produced in a volume filled with an electromagnetic field and the neutrino lifetime in a strong magnetic field are presented. |
1011.5176 | Enrique Ruiz Arriola | Enrique Ruiz Arriola, Wojciech Broniowski | Scalar-isoscalar states, gravitational form factors, and dimension-2
condensates in a large-Nc Regge approach | Talk given at the 9th Conference On Quark Confinement and the Hadron
Spectrum (Confinement IX), 30 Aug. - 3 Sept. 2010, Madrid, Spain | AIP Conf.Proc.1343:361-363,2011 | 10.1063/1.3575030 | null | hep-ph hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Scalar-isoscalar states are analyzed within the large-Nc Regge approach. We
find that the lightest f0(600) scalar-isoscalar state fits very well into the
pattern of the radial Regge trajectory. We confirm the obtained mass values
from an analysis of the pion and nucleon spin-0 gravitational form factors,
recently measured on the lattice. We find that a simple two-state model
suggests a meson nature of f0(600), and a glueball nature of f0(980), which
naturally explains the ratios of various coupling constants. Finally, matching
to the OPE requires a fine-tuned mass condition of the vanishing dimension-2
condensate in the Regge approach with infinitely many scalar-isoscalar states.
| [
{
"created": "Tue, 23 Nov 2010 17:41:35 GMT",
"version": "v1"
}
] | 2011-07-15 | [
[
"Arriola",
"Enrique Ruiz",
""
],
[
"Broniowski",
"Wojciech",
""
]
] | Scalar-isoscalar states are analyzed within the large-Nc Regge approach. We find that the lightest f0(600) scalar-isoscalar state fits very well into the pattern of the radial Regge trajectory. We confirm the obtained mass values from an analysis of the pion and nucleon spin-0 gravitational form factors, recently measured on the lattice. We find that a simple two-state model suggests a meson nature of f0(600), and a glueball nature of f0(980), which naturally explains the ratios of various coupling constants. Finally, matching to the OPE requires a fine-tuned mass condition of the vanishing dimension-2 condensate in the Regge approach with infinitely many scalar-isoscalar states. |
hep-ph/9608359 | null | K.-I. Izawa and T. Yanagida | Natural New Inflation in Broken Supergravity | 12 pages, latex | Phys.Lett.B393:331-336,1997 | 10.1016/S0370-2693(96)01638-3 | UT-757 | hep-ph | null | We consider a natural new inflationary model in broken supergravity based on
an R symmetry. The model predicts a concrete relation between the amplitude of
primordial density fluctuations and the scale of supersymmetry breaking. The
observed value of the density fluctuations is obtained for the gravitino mass
of order the weak scale along with a power-law spectral index considerably less
than one, which may be tested in future observations.
| [
{
"created": "Mon, 19 Aug 1996 07:28:10 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Dec 1996 06:26:26 GMT",
"version": "v2"
}
] | 2011-07-19 | [
[
"Izawa",
"K. -I.",
""
],
[
"Yanagida",
"T.",
""
]
] | We consider a natural new inflationary model in broken supergravity based on an R symmetry. The model predicts a concrete relation between the amplitude of primordial density fluctuations and the scale of supersymmetry breaking. The observed value of the density fluctuations is obtained for the gravitino mass of order the weak scale along with a power-law spectral index considerably less than one, which may be tested in future observations. |
hep-ph/9708386 | Vladimir Braun | V.M. Braun | Ultraviolet dominance of power corrections in QCD? | 7 pages, LATEX, no figures; Presented at 5th International Conference
on Physics Beyond the Standard Model, Balholm, Norway, 29 Apr - 4May 1997 | null | 10.1063/1.54481 | NORDITA 97/53-P | hep-ph | null | I explain current theoretical ideas on higher-twist (hadronization)
corrections to physical observables in QCD.
| [
{
"created": "Mon, 18 Aug 1997 12:31:55 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Aug 1997 15:43:07 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Braun",
"V. M.",
""
]
] | I explain current theoretical ideas on higher-twist (hadronization) corrections to physical observables in QCD. |
hep-ph/0511129 | Xiao-Hong Wu | Chao-Shang Huang, Pyungwon Ko, Xiao-Hong Wu, Ya-Dong Yang | MSSM Anatomy of the Polarization Puzzle in B --> phi K* Decays | 15 pages, 5 figures, minor revision and references added | Phys.Rev.D73:034026,2006 | 10.1103/PhysRevD.73.034026 | null | hep-ph | null | We analyze the $B \to \phi K^{*}$ polarization puzzle in the Minimal
Supersymmetric Standard Model (MSSM) including the neutral Higgs boson (NHB)
contributions. To calculate the non-factorizable contributions to hadronic
matrix elements of operators, we have used the QCD factorization framework to
the $\alpha_s $ order. It is shown that the recent experimental results of the
polarization fractions in $B\to \phi K^{*}$ decays, which are difficult to be
explained in SM, could be explained in MSSM if there are flavor non-diagonal
squark mass matrix elements of 2nd and 3rd generations, which also satisfy all
relevant constraints from known experiments ($B\to X_s\gamma, B_s\to
\mu^+\mu^-, B\to X_s \mu^+\mu^-, B\to X_s g, \Delta M_s$, etc.). We have shown
in details that the experimental results can be accommodated with the flavor
non-diagonal mass insertion of chirality RL, RL+LR, RR, or LL+ RR when the NHB
contributions as well as $\mathcal{O}(\alpha_s)$ corrections of hadronic matrix
elements of operators are included. However the branching ratios for the decay
are smaller than the experimental measurements.
| [
{
"created": "Thu, 10 Nov 2005 13:06:47 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Feb 2006 12:22:28 GMT",
"version": "v2"
}
] | 2011-03-23 | [
[
"Huang",
"Chao-Shang",
""
],
[
"Ko",
"Pyungwon",
""
],
[
"Wu",
"Xiao-Hong",
""
],
[
"Yang",
"Ya-Dong",
""
]
] | We analyze the $B \to \phi K^{*}$ polarization puzzle in the Minimal Supersymmetric Standard Model (MSSM) including the neutral Higgs boson (NHB) contributions. To calculate the non-factorizable contributions to hadronic matrix elements of operators, we have used the QCD factorization framework to the $\alpha_s $ order. It is shown that the recent experimental results of the polarization fractions in $B\to \phi K^{*}$ decays, which are difficult to be explained in SM, could be explained in MSSM if there are flavor non-diagonal squark mass matrix elements of 2nd and 3rd generations, which also satisfy all relevant constraints from known experiments ($B\to X_s\gamma, B_s\to \mu^+\mu^-, B\to X_s \mu^+\mu^-, B\to X_s g, \Delta M_s$, etc.). We have shown in details that the experimental results can be accommodated with the flavor non-diagonal mass insertion of chirality RL, RL+LR, RR, or LL+ RR when the NHB contributions as well as $\mathcal{O}(\alpha_s)$ corrections of hadronic matrix elements of operators are included. However the branching ratios for the decay are smaller than the experimental measurements. |
hep-ph/9704365 | Raul Horvat | R. Horvat (IRB Zagreb) | On finite--temperature and --density radiative corrections to the
neutrino effective potential in the early Universe | 11 pages, revtex style | Mod.Phys.Lett.A12:2461-2468,1997 | 10.1142/S0217732397002570 | null | hep-ph | null | Finite-temperature and -density radiative corrections to the neutrino
effective potential in the otherwise CP-symmetric early Universe are considered
in the real-time approach of Thermal Field Theory. A consistent perturbation
theory endowed with the hard thermal loop resummation techniques developed by
Braaten and Pisarski is applied. Special attention is focused on the question
whether such corrections can generate any nonzero contribution to the
CP-symmetric part of the neutrino potential, if the contact approximation for
the W-propagator is used.
| [
{
"created": "Mon, 21 Apr 1997 19:27:52 GMT",
"version": "v1"
}
] | 2011-03-10 | [
[
"Horvat",
"R.",
"",
"IRB Zagreb"
]
] | Finite-temperature and -density radiative corrections to the neutrino effective potential in the otherwise CP-symmetric early Universe are considered in the real-time approach of Thermal Field Theory. A consistent perturbation theory endowed with the hard thermal loop resummation techniques developed by Braaten and Pisarski is applied. Special attention is focused on the question whether such corrections can generate any nonzero contribution to the CP-symmetric part of the neutrino potential, if the contact approximation for the W-propagator is used. |
2009.07195 | Vladimir Sauli | Vladimir Sauli | Regularization and renormalization scheme with diminished UV divergences | Since crucial error was found in v1 the
regularization/renormalization scheme has changed and results have been
recalculated according to changes. New section devoted to gluon polarization
function added, section which concerns ABJ anomaly is shortened, 14 pages | null | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present new regularization/renormalization scheme, which is based on
utilization of further auxiliary Feynman parameter integral. The later is used
in order to make momentum integration finite before it is actually performed.
In this way all singularities are submitted to the auxiliary integral leaving
as with the finite non-polynomial structure known from the dimensional
renormalization scheme. In order to preserve renormalizability and gauge
invariance in proposed computational scheme we formulate the additional
conditions which regulators dependent (infinite) part of correlator must obey.
The question of absence(presence) of quadratic divergences is discussed and
calculated at one loop approximation for QCD vacuum polarization, photon
polarization function as well as for the Higgs mass function in the Standard
Model. The way how anomaly is exhibited and how to deal with overlapping
divergences is shortly discussed as well.
| [
{
"created": "Tue, 15 Sep 2020 16:09:06 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Jan 2021 18:28:32 GMT",
"version": "v2"
}
] | 2021-01-07 | [
[
"Sauli",
"Vladimir",
""
]
] | We present new regularization/renormalization scheme, which is based on utilization of further auxiliary Feynman parameter integral. The later is used in order to make momentum integration finite before it is actually performed. In this way all singularities are submitted to the auxiliary integral leaving as with the finite non-polynomial structure known from the dimensional renormalization scheme. In order to preserve renormalizability and gauge invariance in proposed computational scheme we formulate the additional conditions which regulators dependent (infinite) part of correlator must obey. The question of absence(presence) of quadratic divergences is discussed and calculated at one loop approximation for QCD vacuum polarization, photon polarization function as well as for the Higgs mass function in the Standard Model. The way how anomaly is exhibited and how to deal with overlapping divergences is shortly discussed as well. |
hep-ph/0412037 | Claudio Coriano | A. Cafarella, Claudio Coriano` and T.N. Tomaras | QCD Supersymmetry and Low Energy Gravity | Contributed paper to the Conference "Quark confinement ant the Hadron
Spectrum VI 2004". Latex, 3 pages | null | 10.1063/1.1921024 | null | hep-ph | null | In this contributed paper we discuss some aspects of scenarios with Extra
Dimensions at the LHC and in cosmic rays.
| [
{
"created": "Thu, 2 Dec 2004 20:06:51 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Dec 2004 22:14:23 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Cafarella",
"A.",
""
],
[
"Coriano`",
"Claudio",
""
],
[
"Tomaras",
"T. N.",
""
]
] | In this contributed paper we discuss some aspects of scenarios with Extra Dimensions at the LHC and in cosmic rays. |
hep-ph/9804260 | Herbert Weigel | H. Weigel (Tuebingen U.) | Radial excitations of low--lying baryons and the $Z^+$ penta--quark | 21 pages, 9 (e)ps-f, to be published in Euro. Phys. J. A | Eur.Phys.J.A2:391,1998 | 10.1007/s100500050136 | UNITU-THEP-7/1998 | hep-ph nucl-th | null | Within an extended Skyrme soliton model for baryons the interplay between the
collective radial motion and the SU(3)--flavor--rotations is investigated. The
coupling between these modes is mediated by flavor symmetry breaking.
Collective coordinates which describe the corresponding large amplitude
fluctuations are introduced and treated canonically. When diagonalizing the
resulting Hamiltonian flavor symmetry breaking is fully taken into
consideration. As eigenstates not only the low--lying ${1/2}^+$ and ${3/2}^+$
baryons but also their radial excitations are obtained and compared to the
empirical data. In particular the relevance of radial excitations for the
penta--quark baryon $Z^+$ (Y=2, I=0, $J^\pi={1/2}^+$) is discussed. In this
approach its mass is predicted to be $1.58{\rm GeV}$. Furthermore the widths
for various hadronic decays are estimated which, for example, yields
$\Gamma(Z^+\to NK)\sim 100{\rm MeV}$ for the only permissible decay process of
the $Z^+$.
| [
{
"created": "Wed, 8 Apr 1998 17:43:09 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Jun 1998 16:36:10 GMT",
"version": "v2"
}
] | 2009-09-25 | [
[
"Weigel",
"H.",
"",
"Tuebingen U."
]
] | Within an extended Skyrme soliton model for baryons the interplay between the collective radial motion and the SU(3)--flavor--rotations is investigated. The coupling between these modes is mediated by flavor symmetry breaking. Collective coordinates which describe the corresponding large amplitude fluctuations are introduced and treated canonically. When diagonalizing the resulting Hamiltonian flavor symmetry breaking is fully taken into consideration. As eigenstates not only the low--lying ${1/2}^+$ and ${3/2}^+$ baryons but also their radial excitations are obtained and compared to the empirical data. In particular the relevance of radial excitations for the penta--quark baryon $Z^+$ (Y=2, I=0, $J^\pi={1/2}^+$) is discussed. In this approach its mass is predicted to be $1.58{\rm GeV}$. Furthermore the widths for various hadronic decays are estimated which, for example, yields $\Gamma(Z^+\to NK)\sim 100{\rm MeV}$ for the only permissible decay process of the $Z^+$. |
1210.4655 | T. Lappi | T. Lappi and H. M\"antysaari | Forward particle correlations in the color glass condensate | 4 pages, 5 figures, talk by T.L. at Quark Matter 2012, Washington DC,
August 13-18 2012 | Nucl.Phys.A904-905 2013 (2013) 807c-810c | 10.1016/j.nuclphysa.2013.02.139 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Multiparticle correlations, such as forward dihadron correlations in pA
collisions, are an important probe of the strong color fields that dominate the
initial stages of a heavy ion collision. We describe recent progress in
understanding two-particle correlations in the dilute-dense system, e.g. at
forward rapidity in deuteron-gold collisions. This requires evaluating higher
point Wilson line correlators from the JIMWLK equation, which we find well
described by a Gaussian approximation. We then calculate the dihadron
correlation, including both the "elastic" and "inelastic" contributions, and
show that our result includes the double parton scattering contribution.
| [
{
"created": "Wed, 17 Oct 2012 07:45:59 GMT",
"version": "v1"
}
] | 2013-08-14 | [
[
"Lappi",
"T.",
""
],
[
"Mäntysaari",
"H.",
""
]
] | Multiparticle correlations, such as forward dihadron correlations in pA collisions, are an important probe of the strong color fields that dominate the initial stages of a heavy ion collision. We describe recent progress in understanding two-particle correlations in the dilute-dense system, e.g. at forward rapidity in deuteron-gold collisions. This requires evaluating higher point Wilson line correlators from the JIMWLK equation, which we find well described by a Gaussian approximation. We then calculate the dihadron correlation, including both the "elastic" and "inelastic" contributions, and show that our result includes the double parton scattering contribution. |
1208.3020 | Stanley J. Brodsky | Stanley J. Brodsky and Guy de Teramond | Light-Front Holography and the Light-Front Schrodinger Equation | Invited talk, presented by SJB at the QCD Evolution Workshop, May 14
- 17, 2012, Thomas Jefferson National Accelerator Facility, Newport News,
Virginia | null | 10.1142/S2010194512009099 | SLAC-PUB-15211 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | One of the most important nonperturbative methods for solving QCD is
quantization at fixed light-front time, \tau = t+z/c -- Dirac's "Front Form".
The eigenvalues of the light-front QCD Hamiltonian predict the hadron spectrum
and the eigensolutions provide the light-front wavefunctions which describe
hadron structure. More generally, we show that the valence Fock-state
wavefunctions of the light-front QCD Hamiltonian satisfy a single-variable
relativistic equation of motion, analogous to the nonrelativistic radial
Schr\"odinger equation, with an effective confining potential U which
systematically incorporates the effects of higher quark and gluon Fock states.
We outline a method for computing the required potential from first principles
in QCD. The holographic mapping of gravity in AdS space to QCD, quantized at
fixed light-front time, yields the same light front Schr\"odinger equation; in
fact, the soft-wall AdS/QCD approach provides a model for the light-front
potential which is color-confining and reproduces well the light-hadron
spectrum. One also derives via light-front holography a precise relation
between the bound-state amplitudes in the fifth dimension of AdS space and the
boost-invariant light-front wavefunctions describing the internal structure of
hadrons in physical space-time. The elastic and transition form factors of the
pion and the nucleons are found to be well described in this framework. The
light-front AdS/QCD holographic approach thus gives a frame-independent first
approximation of the color-confining dynamics, spectroscopy, and excitation
spectra of relativistic light-quark bound states in QCD.
| [
{
"created": "Wed, 15 Aug 2012 03:47:53 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Aug 2012 19:25:43 GMT",
"version": "v2"
}
] | 2015-06-11 | [
[
"Brodsky",
"Stanley J.",
""
],
[
"de Teramond",
"Guy",
""
]
] | One of the most important nonperturbative methods for solving QCD is quantization at fixed light-front time, \tau = t+z/c -- Dirac's "Front Form". The eigenvalues of the light-front QCD Hamiltonian predict the hadron spectrum and the eigensolutions provide the light-front wavefunctions which describe hadron structure. More generally, we show that the valence Fock-state wavefunctions of the light-front QCD Hamiltonian satisfy a single-variable relativistic equation of motion, analogous to the nonrelativistic radial Schr\"odinger equation, with an effective confining potential U which systematically incorporates the effects of higher quark and gluon Fock states. We outline a method for computing the required potential from first principles in QCD. The holographic mapping of gravity in AdS space to QCD, quantized at fixed light-front time, yields the same light front Schr\"odinger equation; in fact, the soft-wall AdS/QCD approach provides a model for the light-front potential which is color-confining and reproduces well the light-hadron spectrum. One also derives via light-front holography a precise relation between the bound-state amplitudes in the fifth dimension of AdS space and the boost-invariant light-front wavefunctions describing the internal structure of hadrons in physical space-time. The elastic and transition form factors of the pion and the nucleons are found to be well described in this framework. The light-front AdS/QCD holographic approach thus gives a frame-independent first approximation of the color-confining dynamics, spectroscopy, and excitation spectra of relativistic light-quark bound states in QCD. |
hep-ph/9707452 | Elizabeth H. Simmons | E.H. Simmons | The Significance of the Heavy Top Quark | 10 pages, Talk given at Beyond the Standard Model V, 29 April - 4
May, 1997, Balholm, Norway | null | 10.1063/1.54449 | BUHEP-97-22 | hep-ph | null | Experiment shows that the top quark is far heavier than the other elementary
fermions. This finding has stimulated research on theories of electroweak and
flavor symmetry breaking that include physics beyond the standard model.
Efforts to accommodate a heavy top quark within existing frameworks have
revealed constraints on model-building. Other investigations have started from
the premise that a large top quark mass could signal a qualitative difference
between the top quark and other fermions, perhaps in the form of new
interactions peculiar to the top quark. Such new dynamics may also help answer
existing questions about electroweak and flavor physics. This talk explores the
implications of the heavy top quark in the context of weakly-coupled (e.g.
SUSY) and strongly-coupled (e.g. technicolor) theories of electroweak symmetry
breaking.
| [
{
"created": "Thu, 24 Jul 1997 18:14:32 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Simmons",
"E. H.",
""
]
] | Experiment shows that the top quark is far heavier than the other elementary fermions. This finding has stimulated research on theories of electroweak and flavor symmetry breaking that include physics beyond the standard model. Efforts to accommodate a heavy top quark within existing frameworks have revealed constraints on model-building. Other investigations have started from the premise that a large top quark mass could signal a qualitative difference between the top quark and other fermions, perhaps in the form of new interactions peculiar to the top quark. Such new dynamics may also help answer existing questions about electroweak and flavor physics. This talk explores the implications of the heavy top quark in the context of weakly-coupled (e.g. SUSY) and strongly-coupled (e.g. technicolor) theories of electroweak symmetry breaking. |
1901.04266 | Wayne de Paula | A. Castro, E. Ydrefors, W. de Paula, T. Frederico, J.H. de Alvarenga
Nogueira and P. Maris | The Bethe-Salpeter approach to bound states: from Euclidean to Minkowski
space | null | null | 10.1088/1742-6596/1291/1/012006 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The challenge to obtain from the Euclidean Bethe--Salpeter amplitude the
amplitude in Minkowski is solved by resorting to un-Wick rotating the Euclidean
homogeneous integral equation. The results obtained with this new practical
method for the amputated Bethe--Salpeter amplitude for a two-boson bound state
reveals a rich analytic structure of this amplitude, which can be traced back
to the Minkowski space Bethe--Salpeter equation using the Nakanishi integral
representation. The method can be extended to small rotation angles bringing
the Euclidean solution closer to the Minkowski one and could allow in principle
the extraction of the longitudinal parton density functions and momentum
distribution amplitude, for example.
| [
{
"created": "Mon, 14 Jan 2019 12:46:41 GMT",
"version": "v1"
}
] | 2019-10-02 | [
[
"Castro",
"A.",
""
],
[
"Ydrefors",
"E.",
""
],
[
"de Paula",
"W.",
""
],
[
"Frederico",
"T.",
""
],
[
"Nogueira",
"J. H. de Alvarenga",
""
],
[
"Maris",
"P.",
""
]
] | The challenge to obtain from the Euclidean Bethe--Salpeter amplitude the amplitude in Minkowski is solved by resorting to un-Wick rotating the Euclidean homogeneous integral equation. The results obtained with this new practical method for the amputated Bethe--Salpeter amplitude for a two-boson bound state reveals a rich analytic structure of this amplitude, which can be traced back to the Minkowski space Bethe--Salpeter equation using the Nakanishi integral representation. The method can be extended to small rotation angles bringing the Euclidean solution closer to the Minkowski one and could allow in principle the extraction of the longitudinal parton density functions and momentum distribution amplitude, for example. |
hep-ph/0102003 | Dipankar Chakrabarti | Asmita Mukherjee and Dipankar Chakrabarti | Quark Transversity Distribution in Perturbative QCD: Light-Front
Hamiltonian Approach | minor changes in the text, references added | Phys.Lett. B506 (2001) 283-288 | 10.1016/S0370-2693(01)00364-1 | null | hep-ph | null | To resolve the current ambiguity in the splitting function corresponding to
the quark transversity distribution $h_1(x)$, we calculate $h_1(x)$ for a
dressed quark in light-front Hamiltonian perturbation theory. Our result agrees
with the expected form of the splitting function found in the literature and
disagrees with the recent calculation in \cite{kuhn}. We emphasize the
importance of quark mass in $h_1(x)$ in perturbative QCD and show its
connection with a part of $g_T$.
| [
{
"created": "Thu, 1 Feb 2001 12:01:37 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Feb 2001 06:21:34 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Mukherjee",
"Asmita",
""
],
[
"Chakrabarti",
"Dipankar",
""
]
] | To resolve the current ambiguity in the splitting function corresponding to the quark transversity distribution $h_1(x)$, we calculate $h_1(x)$ for a dressed quark in light-front Hamiltonian perturbation theory. Our result agrees with the expected form of the splitting function found in the literature and disagrees with the recent calculation in \cite{kuhn}. We emphasize the importance of quark mass in $h_1(x)$ in perturbative QCD and show its connection with a part of $g_T$. |
hep-ph/0107065 | Vladimir Galkin | D. Ebert, R. N. Faustov, V. O. Galkin | Form factors of heavy-to-light B decays at large recoil | 23 pages, revtex | Phys.Rev.D64:094022,2001 | 10.1103/PhysRevD.64.094022 | HU-EP-01/27, RCNP-Th01018 | hep-ph | null | General relations between the form factors of B decays to light mesons are
derived using the heavy quark and large recoil expansion. On their basis the
complete account of contributions of second order in the ratio of the light
meson mass to the large recoil energy is performed. Both ground and excited
final meson states are considered. It is shown that most of the known form
factor relations remain valid after the inclusion of quadratic mass
corrections. The validity of some of such relations requires additional
equalities for the helicity amplitudes. It is found that all these relations
and equalities are fulfilled in the relativistic quark model based on the
quasipotential approach in quantum field theory. The contribution of 1/m_b
corrections to the branching fraction of the rare radiative B decay is
discussed.
| [
{
"created": "Fri, 6 Jul 2001 14:33:50 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Ebert",
"D.",
""
],
[
"Faustov",
"R. N.",
""
],
[
"Galkin",
"V. O.",
""
]
] | General relations between the form factors of B decays to light mesons are derived using the heavy quark and large recoil expansion. On their basis the complete account of contributions of second order in the ratio of the light meson mass to the large recoil energy is performed. Both ground and excited final meson states are considered. It is shown that most of the known form factor relations remain valid after the inclusion of quadratic mass corrections. The validity of some of such relations requires additional equalities for the helicity amplitudes. It is found that all these relations and equalities are fulfilled in the relativistic quark model based on the quasipotential approach in quantum field theory. The contribution of 1/m_b corrections to the branching fraction of the rare radiative B decay is discussed. |
1412.7143 | Vitaly Velizhanin | V.N. Velizhanin | Generalised double-logarithmic equation in QCD | 10 pages, 2 figures | null | null | HU-Mathematik-2014-40, HU-EP-14/62 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a generalisation of the double-logarithmic equation for the
anomalous dimension of the non-singlet unpolarized twist-2 operators in QCD.
Using the known three-loop result, this generalisation allows to predict a
small x expansion of the four-loop non-singlet splitting functions in QCD for
all powers of logarithms up to the single-logarithm term.
| [
{
"created": "Mon, 22 Dec 2014 20:49:21 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Jan 2015 18:26:31 GMT",
"version": "v2"
},
{
"created": "Thu, 30 Nov 2017 18:24:19 GMT",
"version": "v3"
}
] | 2017-12-01 | [
[
"Velizhanin",
"V. N.",
""
]
] | We present a generalisation of the double-logarithmic equation for the anomalous dimension of the non-singlet unpolarized twist-2 operators in QCD. Using the known three-loop result, this generalisation allows to predict a small x expansion of the four-loop non-singlet splitting functions in QCD for all powers of logarithms up to the single-logarithm term. |
2104.09923 | Mario Reig | Mario Reig | The Stochastic Axiverse | 45 pages, 6 figures; v2: references added, accepted for publication
in JHEP | JHEP 09 (2021) 207 | 10.1007/JHEP09(2021)207 | IFIC/21-12 | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | In addition to spectacular signatures such as black hole superradiance and
the rotation of CMB polarization, the plenitude of axions appearing in the
string axiverse may have potentially dangerous implications. An example is the
cosmological overproduction of relic axions and moduli by the misalignment
mechanism, more pronounced in regions where the signals mentioned above may be
observable, that is for large axion decay constant. In this work, we study the
minimal requirements to soften this problem and show that the fundamental
requirement is a long period of low-scale inflation. However, in this case, if
the inflationary Hubble scale is lower than around $O(100)$ eV, no relic DM
axion is produced in the early Universe. Cosmological production of some axions
may be activated, via the misalignment mechanism, if their potential minimum
changes between inflation and today. As a particular example, we study in
detail how the maximal-misalignment mechanism dilutes the effect of dangerous
axions and allows the production of axion DM in a controlled way. In this case,
the potential of the axion that realises the mechanism shifts by a factor
$\Delta\theta=\pi$ between the inflationary epoch and today, and the axion
starts to oscillate from the top of its potential. We also show that axions
with masses $m_a\sim O(1-100)\, H_0$ realising the maximal-misalignment
mechanism generically behave as dark energy with a decay constant that can take
values well below the Planck scale, avoiding problems associated to
super-Planckian scales. Finally, we briefly study the basic phenomenological
implications of the mechanism and comment on the compatibility of this type of
maximally-misaligned quintessence with the swampland criteria.
| [
{
"created": "Tue, 20 Apr 2021 12:31:51 GMT",
"version": "v1"
},
{
"created": "Sun, 12 Sep 2021 19:36:27 GMT",
"version": "v2"
}
] | 2021-10-05 | [
[
"Reig",
"Mario",
""
]
] | In addition to spectacular signatures such as black hole superradiance and the rotation of CMB polarization, the plenitude of axions appearing in the string axiverse may have potentially dangerous implications. An example is the cosmological overproduction of relic axions and moduli by the misalignment mechanism, more pronounced in regions where the signals mentioned above may be observable, that is for large axion decay constant. In this work, we study the minimal requirements to soften this problem and show that the fundamental requirement is a long period of low-scale inflation. However, in this case, if the inflationary Hubble scale is lower than around $O(100)$ eV, no relic DM axion is produced in the early Universe. Cosmological production of some axions may be activated, via the misalignment mechanism, if their potential minimum changes between inflation and today. As a particular example, we study in detail how the maximal-misalignment mechanism dilutes the effect of dangerous axions and allows the production of axion DM in a controlled way. In this case, the potential of the axion that realises the mechanism shifts by a factor $\Delta\theta=\pi$ between the inflationary epoch and today, and the axion starts to oscillate from the top of its potential. We also show that axions with masses $m_a\sim O(1-100)\, H_0$ realising the maximal-misalignment mechanism generically behave as dark energy with a decay constant that can take values well below the Planck scale, avoiding problems associated to super-Planckian scales. Finally, we briefly study the basic phenomenological implications of the mechanism and comment on the compatibility of this type of maximally-misaligned quintessence with the swampland criteria. |
hep-ph/9812325 | null | Alakabha Datta, Patrick. J. O'Donnell, Sandip Pakvasa and Xinmin Zhang | Flavor Changing processes in Quarkonium Decays | Minor changes in the last section. Latex 22 pages, one figure. To
appear in Phys. Rev. D | Phys.Rev. D60 (1999) 014011 | 10.1103/PhysRevD.60.014011 | UTPT-98-17, UH-511-921-98 | hep-ph hep-ex | null | We study flavor changing processes $\Upsilon \to B/{\bar B} X_s$ and $J/\psi
\to D/{\bar D} X_u$ in the B factories and the Tau-Charm factories. In the
standard model, these processes are predicted to be unobservable, so they serve
as a probe of the new physics. We first perform a model independent analysis,
then examine the predictions of models; such as TopColor models, MSSM with
R-parity violation and the two Higgs doublet model; for the branching ratios of
$\Upsilon \to B/{\bar B} X_s$ and $J/\psi \to D/{\bar D} X_u$ . We find that
these branching ratios could be as large as $10^{-6}$ and $10^{-5}$ in the
presence of new physics.
| [
{
"created": "Thu, 10 Dec 1998 19:41:22 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Mar 1999 19:52:37 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Datta",
"Alakabha",
""
],
[
"O'Donnell",
"Patrick. J.",
""
],
[
"Pakvasa",
"Sandip",
""
],
[
"Zhang",
"Xinmin",
""
]
] | We study flavor changing processes $\Upsilon \to B/{\bar B} X_s$ and $J/\psi \to D/{\bar D} X_u$ in the B factories and the Tau-Charm factories. In the standard model, these processes are predicted to be unobservable, so they serve as a probe of the new physics. We first perform a model independent analysis, then examine the predictions of models; such as TopColor models, MSSM with R-parity violation and the two Higgs doublet model; for the branching ratios of $\Upsilon \to B/{\bar B} X_s$ and $J/\psi \to D/{\bar D} X_u$ . We find that these branching ratios could be as large as $10^{-6}$ and $10^{-5}$ in the presence of new physics. |
1212.1662 | Jos\'e Francisco Zurita | Jos\'e Zurita | SUSY confronts LHC data | 5 pages, 4 figures, PLHC proceeding, typos corrected, references
added | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The current searches at the LHC have set strong bounds on the masses of
gluinos and the squarks of the first and second generation. At the same time,
the hints of a Higgs boson at 125 GeV imply some degree of fine-tuning from
radiative corrections to the lightest Higgs mass. Moreover, the rate into
photons seems to be enhanced with respect to the SM, while the ZZ channel is
reduced (albeit the SM is still compatible at the 2-sigma level). In this talk
I will review how the previous issues can be addressed. If the stop is about a
couple-hundred GeV, the SUSY still remains as a natural solution to the
hierarchy problem. I will also show how the MSSM can accommodate a 125 GeV
Higgs and also how extensions of the MSSM can alleviate the fine-tuning on the
Higgs mass. I will also discuss recent literature, showing how both in the MSSM
and its extensions one can find suitable ways to accommodate the measured Higgs
rates into photons and Z bosons.
| [
{
"created": "Fri, 7 Dec 2012 17:25:47 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Dec 2012 11:19:22 GMT",
"version": "v2"
}
] | 2012-12-18 | [
[
"Zurita",
"José",
""
]
] | The current searches at the LHC have set strong bounds on the masses of gluinos and the squarks of the first and second generation. At the same time, the hints of a Higgs boson at 125 GeV imply some degree of fine-tuning from radiative corrections to the lightest Higgs mass. Moreover, the rate into photons seems to be enhanced with respect to the SM, while the ZZ channel is reduced (albeit the SM is still compatible at the 2-sigma level). In this talk I will review how the previous issues can be addressed. If the stop is about a couple-hundred GeV, the SUSY still remains as a natural solution to the hierarchy problem. I will also show how the MSSM can accommodate a 125 GeV Higgs and also how extensions of the MSSM can alleviate the fine-tuning on the Higgs mass. I will also discuss recent literature, showing how both in the MSSM and its extensions one can find suitable ways to accommodate the measured Higgs rates into photons and Z bosons. |
0902.3346 | Antonio Vairo | Antonio Vairo | Non-relativistic bound states: the long way back from the Bethe-Salpeter
to the Schroedinger equation | Contribution to "Fundamental Interactions - A Memorial Volume for
Wolfgang Kummer", D. Grumiller, A. Rebhan, D.V. Vassilevich (eds.); 17 pages,
6 figures; references added | null | 10.1142/9789814277839_0002 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I review, in a personal perspective, the history of the theory of
non-relativistic bound states in QED and QCD from the Bethe-Salpeter equation
to the construction of effective field theories.
| [
{
"created": "Thu, 19 Feb 2009 11:25:26 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Apr 2009 12:48:39 GMT",
"version": "v2"
}
] | 2016-12-21 | [
[
"Vairo",
"Antonio",
""
]
] | I review, in a personal perspective, the history of the theory of non-relativistic bound states in QED and QCD from the Bethe-Salpeter equation to the construction of effective field theories. |
1304.1194 | Ming Gong | M. Gong, A. Alexandru, Y. Chen, T. Doi, S.J. Dong, T. Draper, W.
Freeman, M. Glatzmaier, A. Li, K.F. Liu, Z. Liu | Strangeness and charmness content of nucleon from overlap fermions on
2+1-flavor domain-wall fermion configurations | 34 pages, 18 figures; correct typos and minor updates; Figures
updated, final version published in Phys. Rev. D 88, 014503 (2013) | Phys. Rev. D 88, 014503 (2013) | 10.1103/PhysRevD.88.014503 | null | hep-ph hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a calculation of the strangeness and charmness contents
<N|\bar{s}s|N> and <N|\bar{c}c|N> of the nucleon from dynamical lattice QCD
with 2+1 flavors. The calculation is performed with overlap valence quarks on
2+1-flavor domain-wall fermion gauge configurations. The configurations are
generated by the RBC collaboration on a 24^3*64 lattice with sea quark mass
am_l=0.005, am_s=0.04, and inverse lattice spacing a^{-1}=1.73GeV. Both actions
have chiral symmetry which is essential in avoiding contamination due to the
operator mixing with other flavors. Nucleon propagator and the quark loops are
both computed with stochastic grid sources, while low-mode substitution and
low-mode averaging methods are used respectively which substantially improve
the signal to noise ratio. We obtain the strangeness matrix element f_{T_{s}} =
m_s <N|\bar{s}s|N> / M_N = 0.0334(62), and the charmness content f_{T_{c}} =
m_c <N|\bar{c}c|N> / M_N = 0.094(31) which is resolved from zero by 3\sigma
precision for the first time.
| [
{
"created": "Wed, 3 Apr 2013 21:18:26 GMT",
"version": "v1"
},
{
"created": "Thu, 16 May 2013 18:27:29 GMT",
"version": "v2"
},
{
"created": "Mon, 10 Jun 2013 05:58:48 GMT",
"version": "v3"
},
{
"created": "Sat, 17 Aug 2013 22:34:52 GMT",
"version": "v4"
}
] | 2013-08-20 | [
[
"Gong",
"M.",
""
],
[
"Alexandru",
"A.",
""
],
[
"Chen",
"Y.",
""
],
[
"Doi",
"T.",
""
],
[
"Dong",
"S. J.",
""
],
[
"Draper",
"T.",
""
],
[
"Freeman",
"W.",
""
],
[
"Glatzmaier",
"M.",
""
],
[
"Li",
"A.",
""
],
[
"Liu",
"K. F.",
""
],
[
"Liu",
"Z.",
""
]
] | We present a calculation of the strangeness and charmness contents <N|\bar{s}s|N> and <N|\bar{c}c|N> of the nucleon from dynamical lattice QCD with 2+1 flavors. The calculation is performed with overlap valence quarks on 2+1-flavor domain-wall fermion gauge configurations. The configurations are generated by the RBC collaboration on a 24^3*64 lattice with sea quark mass am_l=0.005, am_s=0.04, and inverse lattice spacing a^{-1}=1.73GeV. Both actions have chiral symmetry which is essential in avoiding contamination due to the operator mixing with other flavors. Nucleon propagator and the quark loops are both computed with stochastic grid sources, while low-mode substitution and low-mode averaging methods are used respectively which substantially improve the signal to noise ratio. We obtain the strangeness matrix element f_{T_{s}} = m_s <N|\bar{s}s|N> / M_N = 0.0334(62), and the charmness content f_{T_{c}} = m_c <N|\bar{c}c|N> / M_N = 0.094(31) which is resolved from zero by 3\sigma precision for the first time. |
1702.02698 | Wei Chao | Wei Chao, Huai-Ke Guo, Jing Shu | Gravitational Wave Signals of Electroweak Phase Transition Triggered by
Dark Matter | 9 pages, 4 figures; more references added | null | 10.1088/1475-7516/2017/09/009 | null | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study in this work a scenario that the universe undergoes a two step phase
transition with the first step happened to the dark matter sector and the
second step being the transition between the dark matter and the electroweak
vacuums, where the barrier between the two vacuums, that is necessary for a
strongly first order electroweak phase transition (EWPT) as required by the
electroweak baryogenesis mechanism, arises at the tree-level. We illustrate
this idea by working with the standard model (SM) augmented by a scalar singlet
dark matter and an extra scalar singlet which mixes with the SM Higgs boson. We
study the conditions for such pattern of phase transition to occur and
especially for the strongly first order EWPT to take place, as well as its
compatibility with the basic requirements of a successful dark matter, such as
observed relic density and constraints of direct detections. We further explore
the discovery possibility of this pattern EWPT by searching for the
gravitational waves generated during this process in spaced based
interferometer, by showing a representative benchmark point of the parameter
space that the generated gravitational waves fall within the sensitivity of
eLISA, DECIGO and BBO.
| [
{
"created": "Thu, 9 Feb 2017 04:22:43 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Feb 2017 07:55:12 GMT",
"version": "v2"
}
] | 2017-09-13 | [
[
"Chao",
"Wei",
""
],
[
"Guo",
"Huai-Ke",
""
],
[
"Shu",
"Jing",
""
]
] | We study in this work a scenario that the universe undergoes a two step phase transition with the first step happened to the dark matter sector and the second step being the transition between the dark matter and the electroweak vacuums, where the barrier between the two vacuums, that is necessary for a strongly first order electroweak phase transition (EWPT) as required by the electroweak baryogenesis mechanism, arises at the tree-level. We illustrate this idea by working with the standard model (SM) augmented by a scalar singlet dark matter and an extra scalar singlet which mixes with the SM Higgs boson. We study the conditions for such pattern of phase transition to occur and especially for the strongly first order EWPT to take place, as well as its compatibility with the basic requirements of a successful dark matter, such as observed relic density and constraints of direct detections. We further explore the discovery possibility of this pattern EWPT by searching for the gravitational waves generated during this process in spaced based interferometer, by showing a representative benchmark point of the parameter space that the generated gravitational waves fall within the sensitivity of eLISA, DECIGO and BBO. |
0806.1049 | David Tucker-Smith | Lisa Randall and David Tucker-Smith | Dijet Searches for Supersymmetry at the LHC | null | Phys.Rev.Lett.101:221803,2008 | 10.1103/PhysRevLett.101.221803 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present several strategies for searching for supersymmetry in dijet
channels that do not explicitly invoke missing energy. Preliminary
investigations suggest that signal-to-background ratios of at least 4--5 should
be achievable at the LHC, with discovery possible for squarks as heavy as ~ 1.7
TeV.
| [
{
"created": "Thu, 5 Jun 2008 20:12:30 GMT",
"version": "v1"
}
] | 2008-12-18 | [
[
"Randall",
"Lisa",
""
],
[
"Tucker-Smith",
"David",
""
]
] | We present several strategies for searching for supersymmetry in dijet channels that do not explicitly invoke missing energy. Preliminary investigations suggest that signal-to-background ratios of at least 4--5 should be achievable at the LHC, with discovery possible for squarks as heavy as ~ 1.7 TeV. |
hep-ph/9912346 | Akaki Rusetsky | A. Rusetsky (Bern University, JINR, Dubna and HEPI, Tbilisi
University) | Report of Working Group on Electromagnetic Corrections | 11 pages. Talk given at ``8th International Symposium on
Meson-Nucleon Physics and the Structure of the Nucleon (MENU99)'', Zuoz,
Switzerland, August 15-20, 1999 | PiN Newslett.15:176-180,1999 | null | BUTP-99/30 | hep-ph | null | The talks delivered by M. Knecht, H. Neufeld, V.E. Lyubovitskij, A. Rusetsky
and J. Soto during the session of the working group of electromagnetic
corrections to hadronic processes at the Eight International Symposium MENU99,
cover a wide range of problems. In particular, those include: construction of
the effective Lagrangians that then are used for the evaluation of
electromagnetic corrections to the decays of K mesons; evaluation of some of
the low-energy constants in these Lagrangians, using sum rules and the
large-N_c arguments; complete calculations of electromagnetic corrections to
the pi pi scattering amplitude at O(e^2p^2); the general theory of
electromagnetic bound states of hadrons in the Standard Model.
| [
{
"created": "Wed, 15 Dec 1999 09:06:16 GMT",
"version": "v1"
}
] | 2011-04-15 | [
[
"Rusetsky",
"A.",
"",
"Bern University, JINR, Dubna and HEPI, Tbilisi\n University"
]
] | The talks delivered by M. Knecht, H. Neufeld, V.E. Lyubovitskij, A. Rusetsky and J. Soto during the session of the working group of electromagnetic corrections to hadronic processes at the Eight International Symposium MENU99, cover a wide range of problems. In particular, those include: construction of the effective Lagrangians that then are used for the evaluation of electromagnetic corrections to the decays of K mesons; evaluation of some of the low-energy constants in these Lagrangians, using sum rules and the large-N_c arguments; complete calculations of electromagnetic corrections to the pi pi scattering amplitude at O(e^2p^2); the general theory of electromagnetic bound states of hadrons in the Standard Model. |
0802.3615 | Masayasu Harada | Masayasu Harada (Nagoya U.) and Chihiro Sasaki (TU Munich) | Dilepton Production from Dropping rho in the Vector Manifestation | Contribution to the proceedings of ``Chiral Symmetry in Hadron and
Nuclear Physics (Chiral 07)'' (November 13-16, 2007, Osaka University, Japan) | Mod.Phys.Lett.A23:2405-2408,2008 | 10.1142/S0217732308029484 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this write-up we summarize the main result of our analysis on the thermal
dilepton production rate from the dropping rho based on the vector
manifestation (VM). In the analysis, we showed that the effect of the strong
violation of the vector dominance (VD) predicted by the VM, substantially
suppresses the dilepton production rate compared with the one predicted by
assuming the VD together with the dropping rho.
| [
{
"created": "Mon, 25 Feb 2008 12:46:34 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Harada",
"Masayasu",
"",
"Nagoya U."
],
[
"Sasaki",
"Chihiro",
"",
"TU Munich"
]
] | In this write-up we summarize the main result of our analysis on the thermal dilepton production rate from the dropping rho based on the vector manifestation (VM). In the analysis, we showed that the effect of the strong violation of the vector dominance (VD) predicted by the VM, substantially suppresses the dilepton production rate compared with the one predicted by assuming the VD together with the dropping rho. |
hep-ph/9711444 | null | R. N. Mohapatra | Neutrino Physics in a Muon collider | Some parts of the text changed; major conclusions unchanged | AIP Conf.Proc.435:358-369,1998 | 10.1063/1.56199 | null | hep-ph | null | A muon collider is expected to produce a high intensity neutrino beam which
is an admixture of either $\nu_{\mu}+\bar{\nu_e}$ or $\bar{\nu}_{\mu} +\nu_e$
which can can be directed to underground detectors far away from the source. It
will not only allow a probe of the $\nu_e-\nu_{\mu}$ as well as
$\nu_{\mu}-\nu_{\tau}$ oscillations in a range of mixing angle and $\Delta m^2$
not probed heretofore but it will also provide information about the mixing
angle $\theta_{e\tau}$ for a wide range of $\Delta m^2_{\nu_e\nu_{\tau}}$ from
$10^{-4}$ eV$^2$ to $10^{-1}$ eV$^2$ which cannot be obtained from any other
existing or proposed machine. One can also search for violations of Lorentz
invariance and deviations from equivalence principle for neutrinos at a level
which is three to four orders of magnitude more sensitive than possible at the
moment. This will test for instance some unorthodox suggestions to understand
both solar and atmospheric neutrinos using a single mass difference -squared
between the $\nu_e$ and $\nu_{\mu}$. It can also test various proposed models
neutrino masses and mixings to understand existing neutrino data.
| [
{
"created": "Mon, 24 Nov 1997 18:00:24 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Dec 1997 14:58:52 GMT",
"version": "v2"
}
] | 2011-07-19 | [
[
"Mohapatra",
"R. N.",
""
]
] | A muon collider is expected to produce a high intensity neutrino beam which is an admixture of either $\nu_{\mu}+\bar{\nu_e}$ or $\bar{\nu}_{\mu} +\nu_e$ which can can be directed to underground detectors far away from the source. It will not only allow a probe of the $\nu_e-\nu_{\mu}$ as well as $\nu_{\mu}-\nu_{\tau}$ oscillations in a range of mixing angle and $\Delta m^2$ not probed heretofore but it will also provide information about the mixing angle $\theta_{e\tau}$ for a wide range of $\Delta m^2_{\nu_e\nu_{\tau}}$ from $10^{-4}$ eV$^2$ to $10^{-1}$ eV$^2$ which cannot be obtained from any other existing or proposed machine. One can also search for violations of Lorentz invariance and deviations from equivalence principle for neutrinos at a level which is three to four orders of magnitude more sensitive than possible at the moment. This will test for instance some unorthodox suggestions to understand both solar and atmospheric neutrinos using a single mass difference -squared between the $\nu_e$ and $\nu_{\mu}$. It can also test various proposed models neutrino masses and mixings to understand existing neutrino data. |
1605.09502 | Jesse Liu | Alan Barr and Jesse Liu | First interpretation of 13 TeV supersymmetry searches in the pMSSM | 5 pages, 3 figures | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The combined constraints from six early Run 2 ATLAS searches for
supersymmetry are interpreted in the phenomenological minimal supersymmetric
extension to the Standard Model (pMSSM). Each of the searches was based on
proton-proton collision data recorded in 2015 at $\sqrt{s} =13$ TeV with 3.2
fb$^{-1}$ of integrated luminosity. Sensitivity to squarks of the first two
generations and gluinos are evaluated using fast detector simulation. Results
are presented in the 19-parameter R-parity conserving pMSSM with the lightest
supersymmetric particle (LSP) being the neutralino. Considering 181.8k points
that survived Run 1 constraints, 15.7% are excluded at 95% confidence level. Of
those satisfying these Run 2 constraints, 0.5% (1.0%) have sub-TeV gluinos
(sub-500 GeV squarks), the lightest of which has a mass of 757 GeV (293 GeV)
with a 689 GeV (217 GeV) LSP.
| [
{
"created": "Tue, 31 May 2016 05:48:32 GMT",
"version": "v1"
}
] | 2016-06-01 | [
[
"Barr",
"Alan",
""
],
[
"Liu",
"Jesse",
""
]
] | The combined constraints from six early Run 2 ATLAS searches for supersymmetry are interpreted in the phenomenological minimal supersymmetric extension to the Standard Model (pMSSM). Each of the searches was based on proton-proton collision data recorded in 2015 at $\sqrt{s} =13$ TeV with 3.2 fb$^{-1}$ of integrated luminosity. Sensitivity to squarks of the first two generations and gluinos are evaluated using fast detector simulation. Results are presented in the 19-parameter R-parity conserving pMSSM with the lightest supersymmetric particle (LSP) being the neutralino. Considering 181.8k points that survived Run 1 constraints, 15.7% are excluded at 95% confidence level. Of those satisfying these Run 2 constraints, 0.5% (1.0%) have sub-TeV gluinos (sub-500 GeV squarks), the lightest of which has a mass of 757 GeV (293 GeV) with a 689 GeV (217 GeV) LSP. |
1812.08163 | Javier Virto | S\'ebastien Descotes-Genon, Adam Falkowski, Marco Fedele, Mart\'in
Gonz\'alez-Alonso, Javier Virto | The CKM parameters in the SMEFT | 36 pages. Version published in JHEP | JHEP 1905, 172 (2019) | 10.1007/JHEP05(2019)172 | LPT Orsay 18-92, CERN-TH-2018-276, TUM-HEP-1178/18, MIT-CTP/5081,
NIOBE-2018-01 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The extraction of the Cabibbo-Kobayashi-Maskawa (CKM) matrix from flavour
observables can be affected by physics beyond the Standard Model (SM). We
provide a general roadmap to take this into account, which we apply to the case
of the Standard Model Effective Field Theory (SMEFT). We choose a set of four
input observables that determine the four Wolfenstein parameters, and discuss
how the effects of dimension-six operators can be included in their definition.
We provide numerical values and confidence intervals for the CKM parameters,
and compare them with the results of CKM fits obtained in the SM context. Our
approach allows one to perform general SMEFT analyses in a consistent fashion,
independently of any assumptions about the way new physics affects flavour
observables. We discuss a few examples illustrating how our approach can be
implemented in practice.
| [
{
"created": "Wed, 19 Dec 2018 18:59:56 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Mar 2019 01:37:40 GMT",
"version": "v2"
},
{
"created": "Tue, 4 Jun 2019 14:47:51 GMT",
"version": "v3"
}
] | 2019-06-05 | [
[
"Descotes-Genon",
"Sébastien",
""
],
[
"Falkowski",
"Adam",
""
],
[
"Fedele",
"Marco",
""
],
[
"González-Alonso",
"Martín",
""
],
[
"Virto",
"Javier",
""
]
] | The extraction of the Cabibbo-Kobayashi-Maskawa (CKM) matrix from flavour observables can be affected by physics beyond the Standard Model (SM). We provide a general roadmap to take this into account, which we apply to the case of the Standard Model Effective Field Theory (SMEFT). We choose a set of four input observables that determine the four Wolfenstein parameters, and discuss how the effects of dimension-six operators can be included in their definition. We provide numerical values and confidence intervals for the CKM parameters, and compare them with the results of CKM fits obtained in the SM context. Our approach allows one to perform general SMEFT analyses in a consistent fashion, independently of any assumptions about the way new physics affects flavour observables. We discuss a few examples illustrating how our approach can be implemented in practice. |
hep-ph/9309333 | null | L.Xiong and E.Shuryak | Gluon multiplication in high energy heavy ion collisions | 28 pages (4 Figures not included here may be requested from the
authors) | Phys.Rev.C49:2203-2211,1994 | 10.1103/PhysRevC.49.2203 | SUNY-NTG-93-24 | hep-ph nucl-th | null | Hot gluons are the dominant components of the QCD plasma to be formed in
future high energy heavy ion experiments. In this paper we study the elementary
processes in the plasma medium for gluon multiplication based on all orders of
the tree-diagrams in perturbative QCD. When applying to the chemical
equilibration in the expanding system, we found that the gluons reaches
chemical equilibrium well within its plasma phase. The inclusion of all the
next-to-leading order processes makes the equilibration considerably faster
than the simple $gg\leftrightarrow ggg$ one considered previously.
| [
{
"created": "Wed, 29 Sep 1993 21:16:55 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Xiong",
"L.",
""
],
[
"Shuryak",
"E.",
""
]
] | Hot gluons are the dominant components of the QCD plasma to be formed in future high energy heavy ion experiments. In this paper we study the elementary processes in the plasma medium for gluon multiplication based on all orders of the tree-diagrams in perturbative QCD. When applying to the chemical equilibration in the expanding system, we found that the gluons reaches chemical equilibrium well within its plasma phase. The inclusion of all the next-to-leading order processes makes the equilibration considerably faster than the simple $gg\leftrightarrow ggg$ one considered previously. |
hep-ph/9712405 | Dr Tony Williams | A.G. Williams (U. of Adelaide) | New results in vector meson dominance and rho meson physics | 16 pages, 1 figures, to appear in the Proceedings of the APCTP
Workshop on Astro-Hadron Physics, ``Properties of Hadrons in Matter'', Seoul,
25-31 October, 1997. *Minor typing and reference corrections.* | null | null | ADP-97-54/T280 | hep-ph | null | Recent results by Benayoun et al. comparing the predictions of a range of
existing models based on the Vector Meson Dominance hypothesis are summarized
and discussed. These are compared with data on e+ e- -> pi+ pi- and e+ e- ->
mu+ mu- cross-sections and the phase and near-threshold behavior of the
timelike pion form factor, with the aim of determining which (if any) of these
models is capable of providing an accurate representation of the full range of
experimental data. We find that, of the models considered, only that proposed
by Bando et al. is able to consistently account for all information, provided
one allows its parameter "a" to vary from the usual value of 2 to 2.4. Our fit
with the Bando model gives a point-like coupling gamma pi+ pi- of magnitude
approximately -e/6, while the common formulation of VMD excludes such a term.
The resulting values for the rho mass and pi+ pi- and e+ e- partial widths as
well as the branching ratio for the decay omega -> pi+ pi- obtained within the
context of this model are consistent with previous results.
| [
{
"created": "Wed, 17 Dec 1997 05:58:04 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Dec 1997 01:18:56 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Williams",
"A. G.",
"",
"U. of Adelaide"
]
] | Recent results by Benayoun et al. comparing the predictions of a range of existing models based on the Vector Meson Dominance hypothesis are summarized and discussed. These are compared with data on e+ e- -> pi+ pi- and e+ e- -> mu+ mu- cross-sections and the phase and near-threshold behavior of the timelike pion form factor, with the aim of determining which (if any) of these models is capable of providing an accurate representation of the full range of experimental data. We find that, of the models considered, only that proposed by Bando et al. is able to consistently account for all information, provided one allows its parameter "a" to vary from the usual value of 2 to 2.4. Our fit with the Bando model gives a point-like coupling gamma pi+ pi- of magnitude approximately -e/6, while the common formulation of VMD excludes such a term. The resulting values for the rho mass and pi+ pi- and e+ e- partial widths as well as the branching ratio for the decay omega -> pi+ pi- obtained within the context of this model are consistent with previous results. |
hep-ph/0405267 | Spencer Chang | Spencer Chang, Can Kilic, Rakhi Mahbubani | The New Fat Higgs: Slimmer and More Attractive | 14 pages and 2 figures. Added references and updated argument about
constraints from reheating temperature | Phys.Rev. D71 (2005) 015003 | 10.1103/PhysRevD.71.015003 | HUTP-04/A025 | hep-ph hep-th | null | In this paper we increase the MSSM tree level higgs mass bound to a value
that is naturally larger than the LEP-II search constraint by adding to the
superpotential a $\lambda S H_{u}H_{d}$ term, as in the NMSSM, and UV
completing with new strong dynamics {\it before} $\lambda$ becomes
non-perturbative. Unlike other models of this type the higgs fields remain
elementary, alleviating the supersymmetric fine-tuning problem while
maintaining unification in a natural way.
| [
{
"created": "Wed, 26 May 2004 19:32:17 GMT",
"version": "v1"
},
{
"created": "Thu, 19 May 2005 19:16:31 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Chang",
"Spencer",
""
],
[
"Kilic",
"Can",
""
],
[
"Mahbubani",
"Rakhi",
""
]
] | In this paper we increase the MSSM tree level higgs mass bound to a value that is naturally larger than the LEP-II search constraint by adding to the superpotential a $\lambda S H_{u}H_{d}$ term, as in the NMSSM, and UV completing with new strong dynamics {\it before} $\lambda$ becomes non-perturbative. Unlike other models of this type the higgs fields remain elementary, alleviating the supersymmetric fine-tuning problem while maintaining unification in a natural way. |
hep-ph/9402203 | Glennys R. Farrar | M. B. Cakir and G. R. Farrar | Radiative Decay of Vector Quarkonium: Constraints on Glueballs and Light
Gluinos | 36pp (inc figs),RU-94-04. (Replaces original which didn't latex
correctly and didn't have figures.) | Phys.Rev.D50:3268-3278,1994 | 10.1103/PhysRevD.50.3268 | null | hep-ph | null | Given a resonance of known mass, width, and J^{PC}, we can determine its
gluonic branching fraction, b(R->gg), from data on its production in radiative
vector quarkonium decay, V -> gamma+R. For most resonances b(R->gg) is found to
be O(10%), consistent with being q-qbar states, but we find that both
pseudoscalars observed in the 1440 MeV region have b(R->gg) ~ 1/2 - 1, and
b(f_0^{++}->gg) ~ 1/2. As data improves, b(R->gg) should be a useful
discriminator between q-qbar and gluonic states and may permit quantitative
determination of the extent to which a particular resonance is a mixture of
glueball and q-qbar. We also examine the regime of validity of pQCD for
predicting the rate of V -> gamma+eta_gluino, the ``extra'' pseudoscalar bound
state which would exist if there were light gluinos. From the CUSB limit on
peaks in Upsilon -> gamma X, the mass range 3 GeV < m(eta_gluino) < 7 GeV can
be excluded. An experiment must be significantly more sensitive to exclude an
eta_gluino lighter than this.
| [
{
"created": "Tue, 1 Feb 1994 23:59:10 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Feb 1994 04:03:44 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Cakir",
"M. B.",
""
],
[
"Farrar",
"G. R.",
""
]
] | Given a resonance of known mass, width, and J^{PC}, we can determine its gluonic branching fraction, b(R->gg), from data on its production in radiative vector quarkonium decay, V -> gamma+R. For most resonances b(R->gg) is found to be O(10%), consistent with being q-qbar states, but we find that both pseudoscalars observed in the 1440 MeV region have b(R->gg) ~ 1/2 - 1, and b(f_0^{++}->gg) ~ 1/2. As data improves, b(R->gg) should be a useful discriminator between q-qbar and gluonic states and may permit quantitative determination of the extent to which a particular resonance is a mixture of glueball and q-qbar. We also examine the regime of validity of pQCD for predicting the rate of V -> gamma+eta_gluino, the ``extra'' pseudoscalar bound state which would exist if there were light gluinos. From the CUSB limit on peaks in Upsilon -> gamma X, the mass range 3 GeV < m(eta_gluino) < 7 GeV can be excluded. An experiment must be significantly more sensitive to exclude an eta_gluino lighter than this. |
0711.4295 | Junegone Chay | Junegone Chay | Transverse-momentum-dependent parton distribution function in
soft-collinear effective theory | 25 pages, 6 figures, added references | null | null | MIT-CTP 3904 | hep-ph | null | Transverse-momentum-dependent parton distribution functions are analyzed in
semi-inclusive deep inelastic scattering at low transverse momentum using
soft-collinear effective theory. The transverse-momentum-dependent parton
distribution functions are defined on the lightcone without distorting the
lightcone path nor adding additional soft Wilson lines. In this approach, the
comparison between the integrated and unintegrated parton distribution
functions becomes transparent. The procedure of computing radiative corrections
in dimensional regularization is explained in detail, and the divergence, which
is a product of infrared and ultraviolet divergence, is cancelled. The
renormalization group equation for the transverse-momentum-dependent parton
distribution functions is derived. It depends only on the relevant physical
quantities and exhibits a nontrivial scaling behavior because the longitudinal
momentum fraction and the transverse momentum are coupled in the
renormalization group equation.
| [
{
"created": "Tue, 27 Nov 2007 16:30:02 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Nov 2007 19:30:48 GMT",
"version": "v2"
}
] | 2007-11-29 | [
[
"Chay",
"Junegone",
""
]
] | Transverse-momentum-dependent parton distribution functions are analyzed in semi-inclusive deep inelastic scattering at low transverse momentum using soft-collinear effective theory. The transverse-momentum-dependent parton distribution functions are defined on the lightcone without distorting the lightcone path nor adding additional soft Wilson lines. In this approach, the comparison between the integrated and unintegrated parton distribution functions becomes transparent. The procedure of computing radiative corrections in dimensional regularization is explained in detail, and the divergence, which is a product of infrared and ultraviolet divergence, is cancelled. The renormalization group equation for the transverse-momentum-dependent parton distribution functions is derived. It depends only on the relevant physical quantities and exhibits a nontrivial scaling behavior because the longitudinal momentum fraction and the transverse momentum are coupled in the renormalization group equation. |
hep-ph/9408403 | Luc Marleau | B. Dion, L. Marleau and G. Simon | Skyrmions from a Born-Infeld Action | 11 pages, 4 figures (not included), revtex v3, LAVAL-PHY-11-94 | Phys.Rev. D53 (1996) 1542-1547 | 10.1103/PhysRevD.53.1542 | null | hep-ph | null | We consider a geometrically motivated Skyrme model based on a general
covariant kinetic term proposed originally by Born and Infeld. We introduce
this new term by generalizing the Born-Infeld action to a non-abelian $SU(2)$
gauge theory and by using the hidden gauge symmetry formalism. The static
properties of the Skyrmion are then analyzed and compared with other
Skyrme-like models.
| [
{
"created": "Wed, 31 Aug 1994 07:32:21 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Dion",
"B.",
""
],
[
"Marleau",
"L.",
""
],
[
"Simon",
"G.",
""
]
] | We consider a geometrically motivated Skyrme model based on a general covariant kinetic term proposed originally by Born and Infeld. We introduce this new term by generalizing the Born-Infeld action to a non-abelian $SU(2)$ gauge theory and by using the hidden gauge symmetry formalism. The static properties of the Skyrmion are then analyzed and compared with other Skyrme-like models. |
1309.3389 | Bernd Kniehl | Paolo Bolzoni, Bernd A. Kniehl, Gustav Kramer | Inclusive J/psi and psi(2S) production from b-hadron decay in p anti-p
and pp collisions | 13 pages, 2 figures; comparison with approximative evaluation
included, discussion enhanced, references added; accepted for publication in
Phys. Rev. D | null | 10.1103/PhysRevD.88.074035 | DESY 13-159 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the inclusive production of J/psi and psi(2S) mesons originating
from the decays of bottom-flavored hadrons produced in p anti-p collisions at
the Fermilab Tevatron and in pp collisions at the CERN LHC. We work at
next-to-leading order in the general-mass variable-flavor-number scheme
(GM-VFNS) implemented with nonperturbative fragmentation functions fitted to
e^+e^- data of inclusive b-hadron production exploiting their universality. The
three-momentum distributions of the charmonia used were extracted from B-decay
data in the framework of nonrelativistic-QCD factorization. Comparing the
theoretical predictions thus obtained with transverse-momentum distributions
measured by the CDF II, ALICE, ATLAS, CMS, and LHCb Collaborations, we find
excellent overall agreement as for both absolute normalization and lineshape,
which provides a nontrivial test of the GM-VFNS over wide ranges of
center-of-mass energy, transverse momentum, and rapidity.
| [
{
"created": "Fri, 13 Sep 2013 08:18:32 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Oct 2013 20:29:07 GMT",
"version": "v2"
}
] | 2015-06-17 | [
[
"Bolzoni",
"Paolo",
""
],
[
"Kniehl",
"Bernd A.",
""
],
[
"Kramer",
"Gustav",
""
]
] | We study the inclusive production of J/psi and psi(2S) mesons originating from the decays of bottom-flavored hadrons produced in p anti-p collisions at the Fermilab Tevatron and in pp collisions at the CERN LHC. We work at next-to-leading order in the general-mass variable-flavor-number scheme (GM-VFNS) implemented with nonperturbative fragmentation functions fitted to e^+e^- data of inclusive b-hadron production exploiting their universality. The three-momentum distributions of the charmonia used were extracted from B-decay data in the framework of nonrelativistic-QCD factorization. Comparing the theoretical predictions thus obtained with transverse-momentum distributions measured by the CDF II, ALICE, ATLAS, CMS, and LHCb Collaborations, we find excellent overall agreement as for both absolute normalization and lineshape, which provides a nontrivial test of the GM-VFNS over wide ranges of center-of-mass energy, transverse momentum, and rapidity. |
1010.1635 | Thorsten Renk | Thorsten Renk, Hannu Holopainen, Ulrich Heinz and Chun Shen | A systematic comparison of jet quenching in different fluid-dynamical
models | 17 pages, 11 figures | Phys.Rev.C83:014910,2011 | 10.1103/PhysRevC.83.014910 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Comparing four different (ideal and viscous) hydrodynamic models for the
evolution of the medium created in 200 AGeV Au-Au collisions, combined with two
different models for the path length dependence of parton energy loss, we study
the effects of jet quenching on the emission-angle dependence of the nuclear
suppression factor R_AA(phi) and the away-side per trigger yield I_AA(phi).
Each hydrodynamic model was tuned to provide a reasonable description of the
single-particle transverse momentum spectra for all collision centralities, and
the energy loss models were adjusted to yield the same pion nuclear suppression
factor in central Au-Au collisions. We find that the experimentally measured
in-plane vs. out-of-plane spread in R_AA(phi) is better reproduced by models
that shift the weight of the parton energy loss to later times along its path.
Among the models studied here, this is best achieved by energy loss models that
suppress energy loss at early times, combined with hydrodynamic models that
delay the dilution of the medium density due to hydrodynamic expansion by
viscous heating. We were unable to identify a clear tomographic benefit of a
measurement of I_AA(phi) over that of R_AA(phi).
| [
{
"created": "Fri, 8 Oct 2010 09:28:34 GMT",
"version": "v1"
}
] | 2011-02-28 | [
[
"Renk",
"Thorsten",
""
],
[
"Holopainen",
"Hannu",
""
],
[
"Heinz",
"Ulrich",
""
],
[
"Shen",
"Chun",
""
]
] | Comparing four different (ideal and viscous) hydrodynamic models for the evolution of the medium created in 200 AGeV Au-Au collisions, combined with two different models for the path length dependence of parton energy loss, we study the effects of jet quenching on the emission-angle dependence of the nuclear suppression factor R_AA(phi) and the away-side per trigger yield I_AA(phi). Each hydrodynamic model was tuned to provide a reasonable description of the single-particle transverse momentum spectra for all collision centralities, and the energy loss models were adjusted to yield the same pion nuclear suppression factor in central Au-Au collisions. We find that the experimentally measured in-plane vs. out-of-plane spread in R_AA(phi) is better reproduced by models that shift the weight of the parton energy loss to later times along its path. Among the models studied here, this is best achieved by energy loss models that suppress energy loss at early times, combined with hydrodynamic models that delay the dilution of the medium density due to hydrodynamic expansion by viscous heating. We were unable to identify a clear tomographic benefit of a measurement of I_AA(phi) over that of R_AA(phi). |
hep-ph/9902265 | Kai Gallmeister | K. Gallmeister, B. Kaempfer, O.P. Pavlenko | Dileptons and Charm & Bottom in Relativistic Heavy-Ion Collisions | 8 LaTeX pages including eps figures, contribution to the 37th
International Winter Meeting on Nuclear Physics, Bormio, Jan 25-29, 1999 | null | null | null | hep-ph | null | We study the prospects to get information about the early and hot stages of
deconfined matter produced in relativistic heavy-ion collisions by analyzing
dilepton and single-lepton spectra. Energy losses of heavy quarks in deconfined
matter and thermalization effects in hadron matter and their influence on
lepton spectra are considered.
| [
{
"created": "Mon, 8 Feb 1999 12:50:35 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Gallmeister",
"K.",
""
],
[
"Kaempfer",
"B.",
""
],
[
"Pavlenko",
"O. P.",
""
]
] | We study the prospects to get information about the early and hot stages of deconfined matter produced in relativistic heavy-ion collisions by analyzing dilepton and single-lepton spectra. Energy losses of heavy quarks in deconfined matter and thermalization effects in hadron matter and their influence on lepton spectra are considered. |
2203.08270 | Scott Snyder | Scott Snyder (1), Christian Weber (1), Danyi Zhang (2) ((1) Brookhaven
National Laboratory, (2) Institute of High Energy Physics, Beijing) | Prospects for searches for Higgs boson decays to dark photons at the ILC | 20 pages, 6 figures. Submitted to the Proceedings of the US Community
Study on the Future of Particle Physics (Snowmass 2021) | null | null | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | An interesting model of dark matter involves a hidden sector decoupled from
Standard Model (SM) fields except for some portal interaction. A concrete
realization of this is the Hidden Abelian Higgs Model, which gives rise to
decays of the SM Higgs boson into a pair of new bosons, called $Z_{\mathrm{d}}$
or dark photons. This note explores prospects for the search for such dark
photons at the ILC with $\sqrt{s}=250$ GeV, where the dark photons decay
promptly. For the $H\rightarrow Z_{\mathrm{d}}Z_{\mathrm{d}}\rightarrow 4\ell$
($\ell = e,\mu$) final state, it follows closely recent similar searches at the
LHC, while for the $2\ell2j$ and $4j$ final states a multivariate analysis
approach is used. This study has not been approved by the SiD consortium.
| [
{
"created": "Tue, 15 Mar 2022 21:43:31 GMT",
"version": "v1"
}
] | 2022-03-17 | [
[
"Snyder",
"Scott",
""
],
[
"Weber",
"Christian",
""
],
[
"Zhang",
"Danyi",
""
]
] | An interesting model of dark matter involves a hidden sector decoupled from Standard Model (SM) fields except for some portal interaction. A concrete realization of this is the Hidden Abelian Higgs Model, which gives rise to decays of the SM Higgs boson into a pair of new bosons, called $Z_{\mathrm{d}}$ or dark photons. This note explores prospects for the search for such dark photons at the ILC with $\sqrt{s}=250$ GeV, where the dark photons decay promptly. For the $H\rightarrow Z_{\mathrm{d}}Z_{\mathrm{d}}\rightarrow 4\ell$ ($\ell = e,\mu$) final state, it follows closely recent similar searches at the LHC, while for the $2\ell2j$ and $4j$ final states a multivariate analysis approach is used. This study has not been approved by the SiD consortium. |
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