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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0709.3494 | Jernej Kamenik | Jernej F. Kamenik | Role of Resonances in Heavy Meson Processes within Standard Model and
Beyond | 184 pages, Ph.D. Thesis (Advisor: Svjetlana Fajfer) | null | null | null | hep-ph | null | The effective theory based on combined chiral and heavy quark symmetry, the
heavy meson chiral perturbation theory, is applied to studying the role of
resonances in various processes of heavy mesons within and beyond the Standard
Model. Chiral corrections including both positive and negative parity heavy
meson doublets are calculated to the effective strong couplings featuring in
the effective theory leading order interaction Lagrangian, to the Isgur-Wise
functions in semileptonic B to D decays and to the complete set of
supersymmetric four-quark operators mediating heavy neutral meson mixing. Bare
values of the effective strong couplings are extracted from the measured decay
widths of charmed resonances. Chiral behavior of the couplings, Isgur-Wise
functions and heavy meson bag parameters is studied in the leading logarithmic
approximation. In semileptonic heavy to light decays we determine resonance
contributions to the various form factors within an effective theory inspired
model at zero recoil. We employ a form factor parameterization based on
effective theory limits to extrapolate our results to the whole kinematical
region in charm decays. We compare our results with experimental data and
lattice calculations. Very rare nonleptonic decays of the B_c meson are studied
within the Standard Model where they are mediated by box loop diagrams, and
within a number of Standard Model extensions. Based on existing experimental
searches for related B meson decays, limits are imposed on some of the models
studied. The most promissing nonleptonic two- and three-body decay channels of
the B_c meson in the search for such new physics contributions are identified.
| [
{
"created": "Fri, 21 Sep 2007 18:24:00 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Nov 2007 13:55:18 GMT",
"version": "v2"
}
] | 2007-11-06 | [
[
"Kamenik",
"Jernej F.",
""
]
] | The effective theory based on combined chiral and heavy quark symmetry, the heavy meson chiral perturbation theory, is applied to studying the role of resonances in various processes of heavy mesons within and beyond the Standard Model. Chiral corrections including both positive and negative parity heavy meson doublets are calculated to the effective strong couplings featuring in the effective theory leading order interaction Lagrangian, to the Isgur-Wise functions in semileptonic B to D decays and to the complete set of supersymmetric four-quark operators mediating heavy neutral meson mixing. Bare values of the effective strong couplings are extracted from the measured decay widths of charmed resonances. Chiral behavior of the couplings, Isgur-Wise functions and heavy meson bag parameters is studied in the leading logarithmic approximation. In semileptonic heavy to light decays we determine resonance contributions to the various form factors within an effective theory inspired model at zero recoil. We employ a form factor parameterization based on effective theory limits to extrapolate our results to the whole kinematical region in charm decays. We compare our results with experimental data and lattice calculations. Very rare nonleptonic decays of the B_c meson are studied within the Standard Model where they are mediated by box loop diagrams, and within a number of Standard Model extensions. Based on existing experimental searches for related B meson decays, limits are imposed on some of the models studied. The most promissing nonleptonic two- and three-body decay channels of the B_c meson in the search for such new physics contributions are identified. |
0804.2185 | Won Sang Cho | Won Sang Cho, Kiwoon Choi, Yeong Gyun Kim, Chan Beom Park | Measuring the top quark mass with m_T2 at the LHC | 10 pages, 4 figures | Phys.Rev.D78:034019,2008 | 10.1103/PhysRevD.78.034019 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the possibility to measure the top quark mass using the
collider variable $m_{T2}$ at the LHC experiment. Monte Carlo studies of
$m_{T2}$ are performed with the events corresponding to the dilepton decays of
$t\bar{t}$ produced at the LHC with 10 $fb^{-1}$ integrated luminosity. Our
analysis suggests that the top quark mass can be determined by the $m_{T2}$
variable alone with a good precision at the level of 1 GeV.
| [
{
"created": "Mon, 14 Apr 2008 14:22:18 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Cho",
"Won Sang",
""
],
[
"Choi",
"Kiwoon",
""
],
[
"Kim",
"Yeong Gyun",
""
],
[
"Park",
"Chan Beom",
""
]
] | We investigate the possibility to measure the top quark mass using the collider variable $m_{T2}$ at the LHC experiment. Monte Carlo studies of $m_{T2}$ are performed with the events corresponding to the dilepton decays of $t\bar{t}$ produced at the LHC with 10 $fb^{-1}$ integrated luminosity. Our analysis suggests that the top quark mass can be determined by the $m_{T2}$ variable alone with a good precision at the level of 1 GeV. |
1404.0109 | Yikun Wang | Yikun Wang, Zhi-zhong Xing | Commutators of lepton mass matrices associated with seesaw and
leptogenesis | LaTex 8 pages. Minor changes. Accepted for publication in Phys. Rev.
D | Phys. Rev. D 89, 097301 (2014) | 10.1103/PhysRevD.89.097301 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The origin of tiny neutrino masses and the baryon number asymmetry of the
Universe are naturally interpreted by the canonical seesaw and leptogenesis
mechanisms, in which there are the heavy Majorana neutrino mass matrix $M_{\rm
R}$, the Dirac neutrino mass matrix $M_{\rm D}$, the charged-lepton mass matrix
$M_\ell$ and the effective (light) neutrino mass matrix $M_\nu$. We find that
${\rm Im}\left(\det\left[ M^\dagger_{\rm D} M_{\rm D}, M^\dagger_{\rm R} M_{\rm
R} \right]\right)$, ${\rm Im}\left(\det\left[ M_\ell M^\dagger_\ell, M_\nu
M^\dagger_\nu \right]\right)$ and ${\rm Im}\left(\det\left[ M_\ell
M^\dagger_\ell, M_{\rm D} M^\dagger_{\rm D} \right]\right)$ can serve for a
basis-independent measure of CP violation associated with
lepton-number-violating decays of heavy neutrinos, flavor oscillations of light
neutrinos and lepton-flavor-violating decays of charged leptons, respectively.
We first calculate these quantities with the help of a standard parametrization
of the $6\times 6$ flavor mixing matrix, and then discuss their implications on
both leptogenesis and CP violation at low energy scales. A comparison with the
weak-basis invariants of leptogenesis as proposed by Branco {\it et al} is also
made.
| [
{
"created": "Tue, 1 Apr 2014 02:23:10 GMT",
"version": "v1"
},
{
"created": "Sun, 25 May 2014 09:39:18 GMT",
"version": "v2"
}
] | 2014-06-06 | [
[
"Wang",
"Yikun",
""
],
[
"Xing",
"Zhi-zhong",
""
]
] | The origin of tiny neutrino masses and the baryon number asymmetry of the Universe are naturally interpreted by the canonical seesaw and leptogenesis mechanisms, in which there are the heavy Majorana neutrino mass matrix $M_{\rm R}$, the Dirac neutrino mass matrix $M_{\rm D}$, the charged-lepton mass matrix $M_\ell$ and the effective (light) neutrino mass matrix $M_\nu$. We find that ${\rm Im}\left(\det\left[ M^\dagger_{\rm D} M_{\rm D}, M^\dagger_{\rm R} M_{\rm R} \right]\right)$, ${\rm Im}\left(\det\left[ M_\ell M^\dagger_\ell, M_\nu M^\dagger_\nu \right]\right)$ and ${\rm Im}\left(\det\left[ M_\ell M^\dagger_\ell, M_{\rm D} M^\dagger_{\rm D} \right]\right)$ can serve for a basis-independent measure of CP violation associated with lepton-number-violating decays of heavy neutrinos, flavor oscillations of light neutrinos and lepton-flavor-violating decays of charged leptons, respectively. We first calculate these quantities with the help of a standard parametrization of the $6\times 6$ flavor mixing matrix, and then discuss their implications on both leptogenesis and CP violation at low energy scales. A comparison with the weak-basis invariants of leptogenesis as proposed by Branco {\it et al} is also made. |
1001.3509 | Honghui Wang | Bo Feng, Honghui Wang | Cross Section Evaluation by Spinor Integration II: The massive case in
4D | 23 pages, 1 figure;further comments and references added | Phys.Rev.D81:056007,2010 | 10.1103/PhysRevD.81.056007 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we continue our study of calculating the cross section by the
spinor method, i.e., performing the phase space integration using the spinor
method. We have focused on the case where the physical momenta are massive and
in pure 4D. We established the framework of such a new method and presented
several examples, including two real progresses: $Z^0\to l^+ l^- H$ and
$\bar{qq} \to \bar{ff} H^0$.
| [
{
"created": "Wed, 20 Jan 2010 08:49:46 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Mar 2010 08:52:30 GMT",
"version": "v2"
}
] | 2014-11-20 | [
[
"Feng",
"Bo",
""
],
[
"Wang",
"Honghui",
""
]
] | In this paper, we continue our study of calculating the cross section by the spinor method, i.e., performing the phase space integration using the spinor method. We have focused on the case where the physical momenta are massive and in pure 4D. We established the framework of such a new method and presented several examples, including two real progresses: $Z^0\to l^+ l^- H$ and $\bar{qq} \to \bar{ff} H^0$. |
2404.15085 | Nakul Soni Dr. | Mikhail A. Ivanov, Jignesh N. Pandya, Pietro Santorelli, Nakul R. Soni | Decay $B_c^+ \to D_{(s)}^{(*)+} \ell^+\ell^-$ within covariant confined
quark model | null | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Here we study the rare decay of $B_c$ mesons within the effective field
theoretical framework of covariant confined quark model. The transition form
factors corresponding to $B_c^+ \to D^{(*)+}$ and $B_c^+ \to D_s^{(*)+}$ are
computed in the entire $q^2$ range. Using form factors we compute the branching
fractions and compare with the available theoretical approaches. We also
compute other physical observables such as forward backward asymmetry,
longitudinal and transverse polarizations and various clean angular
observables.
| [
{
"created": "Tue, 23 Apr 2024 14:36:38 GMT",
"version": "v1"
}
] | 2024-04-24 | [
[
"Ivanov",
"Mikhail A.",
""
],
[
"Pandya",
"Jignesh N.",
""
],
[
"Santorelli",
"Pietro",
""
],
[
"Soni",
"Nakul R.",
""
]
] | Here we study the rare decay of $B_c$ mesons within the effective field theoretical framework of covariant confined quark model. The transition form factors corresponding to $B_c^+ \to D^{(*)+}$ and $B_c^+ \to D_s^{(*)+}$ are computed in the entire $q^2$ range. Using form factors we compute the branching fractions and compare with the available theoretical approaches. We also compute other physical observables such as forward backward asymmetry, longitudinal and transverse polarizations and various clean angular observables. |
2304.12128 | Chang Yang | Hang Liu and Chang Yang | Two-body hadronic decays of Xi^{0}_c in light front approach | 10 pages,4 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this study, we investigate the nonleptonic decays of the charmed-baryon
Xi^ {0} _ c induced by the c -> u(d\bar{d})/(s\bar{s}) transition. Utilizing
the factorization assumption, we decompose the decay amplitudes in terms of
transition form factors which are then calculated within the light-front quark
model. We employ helicity amplitudes to analyze the nonleptonic decay modes of
the charmed-baryon Xi^ {0} _c and derive benchmark results for decay widths and
branching fractions. Our calculations suggest that the branching fractions for
some of these rare nonleptonic decays are at the order of 10^ {-4} - 10^ {-3},
which are likely to be detectable at experiments such as LHCb or BESIII. The
potential data accumulated in the future may help to further our understanding
of the decay mechanism in the presence of charm quarks.
| [
{
"created": "Mon, 24 Apr 2023 14:32:40 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Aug 2023 11:16:31 GMT",
"version": "v2"
}
] | 2023-08-15 | [
[
"Liu",
"Hang",
""
],
[
"Yang",
"Chang",
""
]
] | In this study, we investigate the nonleptonic decays of the charmed-baryon Xi^ {0} _ c induced by the c -> u(d\bar{d})/(s\bar{s}) transition. Utilizing the factorization assumption, we decompose the decay amplitudes in terms of transition form factors which are then calculated within the light-front quark model. We employ helicity amplitudes to analyze the nonleptonic decay modes of the charmed-baryon Xi^ {0} _c and derive benchmark results for decay widths and branching fractions. Our calculations suggest that the branching fractions for some of these rare nonleptonic decays are at the order of 10^ {-4} - 10^ {-3}, which are likely to be detectable at experiments such as LHCb or BESIII. The potential data accumulated in the future may help to further our understanding of the decay mechanism in the presence of charm quarks. |
hep-ph/9308375 | Ed Stoeffhaas | F.Halzen | 14th International Workshop on Weak Interactions: Concluding Remarks | Talk presented at the 14th International Workshop on Weak
Interactions and Neutrinos, Seoul, Korea, July 1993. Standard Latex. 8 pages
including 2 postscript figures, "uufiles" and submitted to hep-ph. Uses
epsf.sty to include figures in text. MAD/PH/786 | null | null | null | hep-ph | null | This superbly organized workshop invited the participants to focus on four
outstanding questions in weak interactions: i) is the electroweak model correct
at the quantum level? ii)supersymmetry? iii) neutrino mass? iv) what is the
nature of CP-violation? The meeting demonstrated how weak-interaction physics
has become a terrain successfully covered by accelerator and non-accelerator
experiments in a very complimentary way.
| [
{
"created": "Tue, 31 Aug 1993 21:30:23 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Halzen",
"F.",
""
]
] | This superbly organized workshop invited the participants to focus on four outstanding questions in weak interactions: i) is the electroweak model correct at the quantum level? ii)supersymmetry? iii) neutrino mass? iv) what is the nature of CP-violation? The meeting demonstrated how weak-interaction physics has become a terrain successfully covered by accelerator and non-accelerator experiments in a very complimentary way. |
hep-ph/9607323 | null | Christopher D. Carone (LBNL) | (S_3)^3 Theories of Flavor | 12 pp. LaTeX, Talk presented at the 5th International Workshop on
Supersymmetry and Unification of Fundamental Interactions (SUSY-96), U. of
Maryland, College Park, May 29-June 1, 1996 | Nucl.Phys.Proc.Suppl.52A:177-181,1997 | 10.1016/S0920-5632(96)00557-9 | LBNL-39096 | hep-ph | null | I present a supersymmetric theory of flavor based on the discrete flavor
group $(S_3)^3$. The model can account for the masses and mixing angles of the
standard model, while maintaining sufficient sfermion degeneracy to evade the
supersymmetric flavor problem. I demonstrate that the model has a viable
phenomenology and makes one very striking prediction: the nucleon decays
predominantly to $K l$ where $l$ is a {\em first} generation lepton. I show
that the modes $n \rightarrow K^0 \bar{\nu}_e$, $p\rightarrow K^+ \bar{\nu}_e$,
and $p\rightarrow K^0 e^+$ occur at comparable rates, and could well be
discovered simultaneously at the SuperKamiokande experiment.
| [
{
"created": "Mon, 15 Jul 1996 20:46:00 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Carone",
"Christopher D.",
"",
"LBNL"
]
] | I present a supersymmetric theory of flavor based on the discrete flavor group $(S_3)^3$. The model can account for the masses and mixing angles of the standard model, while maintaining sufficient sfermion degeneracy to evade the supersymmetric flavor problem. I demonstrate that the model has a viable phenomenology and makes one very striking prediction: the nucleon decays predominantly to $K l$ where $l$ is a {\em first} generation lepton. I show that the modes $n \rightarrow K^0 \bar{\nu}_e$, $p\rightarrow K^+ \bar{\nu}_e$, and $p\rightarrow K^0 e^+$ occur at comparable rates, and could well be discovered simultaneously at the SuperKamiokande experiment. |
hep-ph/0004091 | Karim Benakli | I. Antoniadis, K. Benakli, M. Quiros | Radiative Symmetry Breaking in Brane Models | 16 pages, Latex2e, 2 eps figures. Some comments on the large
(longitudinal) radius limit of the mass term at the origin are developed, and
new references added | Nucl.Phys. B583 (2000) 35-48 | 10.1016/S0550-3213(00)00357-6 | null | hep-ph hep-th | null | We propose a way to generate the electroweak symmetry breaking radiatively in
non-supersymmetric type I models with string scale in the TeV region. By
identifying the Higgs field with a tree-level massless open string state, we
find that a negative squared mass term can be generated at one loop. It is
finite, computable and typically a loop factor smaller than the string scale,
that acts as an ultraviolet cutoff in the effective field theory. When the
Higgs open string has both ends confined on our world brane, its mass is
predicted to be around 120 GeV, i.e. that of the lightest Higgs in the minimal
supersymmetric model for large $\tan\beta$ and $m_A$. Moreover, the string
scale turns out to be one to two orders of magnitude higher than the weak
scale. We also discuss possible effects of higher order string threshold
corrections that might increase the string scale and the Higgs mass.
| [
{
"created": "Mon, 10 Apr 2000 16:38:16 GMT",
"version": "v1"
},
{
"created": "Thu, 4 May 2000 15:08:22 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Antoniadis",
"I.",
""
],
[
"Benakli",
"K.",
""
],
[
"Quiros",
"M.",
""
]
] | We propose a way to generate the electroweak symmetry breaking radiatively in non-supersymmetric type I models with string scale in the TeV region. By identifying the Higgs field with a tree-level massless open string state, we find that a negative squared mass term can be generated at one loop. It is finite, computable and typically a loop factor smaller than the string scale, that acts as an ultraviolet cutoff in the effective field theory. When the Higgs open string has both ends confined on our world brane, its mass is predicted to be around 120 GeV, i.e. that of the lightest Higgs in the minimal supersymmetric model for large $\tan\beta$ and $m_A$. Moreover, the string scale turns out to be one to two orders of magnitude higher than the weak scale. We also discuss possible effects of higher order string threshold corrections that might increase the string scale and the Higgs mass. |
1909.07790 | Himadri Roy | Indrani Chakraborty, Himadri Roy | Type-I thermal leptogenesis in $Z_3$-symmetric three Higgs doublet model | 37 pages, 10 captioned figures, 1 table, Accepted for publication in
EPJC | null | 10.1140/epjc/s10052-020-8377-9 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Our present work explores the possibility of neutrino mass generation through
{\em Type-I see-saw} mechanism and provides an explanation of the baryon
asymmetry of the Universe via thermal leptogenesis in the framework of
$Z_3$-symmetric three Higgs doublet model (3HDM) augmented with three
right-handed neutrinos. Here the thermal leptogenesis is initiated by the
out-of-equilibrium decay of the lightest heavy neutrino $N_1$. The constraints
arising out of the scalar sector put strong bound on the model parameter $\tan
\beta$, which in turn takes part in the computation of the lepton asymmetry
$\epsilon$. Lepton asymmetry being converted partially into the baryon
asymmetry by electroweak sphelaron processes, will account for the required
baryon asymmetry satisfying the current data. We therefore analyse the
parameter space consistent with the constraints arising from neutrino
oscillation, lepton asymmetry and baryon asymmetry together, last one being the
most stringent one.
| [
{
"created": "Tue, 17 Sep 2019 13:41:42 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Sep 2020 14:00:45 GMT",
"version": "v2"
}
] | 2020-09-08 | [
[
"Chakraborty",
"Indrani",
""
],
[
"Roy",
"Himadri",
""
]
] | Our present work explores the possibility of neutrino mass generation through {\em Type-I see-saw} mechanism and provides an explanation of the baryon asymmetry of the Universe via thermal leptogenesis in the framework of $Z_3$-symmetric three Higgs doublet model (3HDM) augmented with three right-handed neutrinos. Here the thermal leptogenesis is initiated by the out-of-equilibrium decay of the lightest heavy neutrino $N_1$. The constraints arising out of the scalar sector put strong bound on the model parameter $\tan \beta$, which in turn takes part in the computation of the lepton asymmetry $\epsilon$. Lepton asymmetry being converted partially into the baryon asymmetry by electroweak sphelaron processes, will account for the required baryon asymmetry satisfying the current data. We therefore analyse the parameter space consistent with the constraints arising from neutrino oscillation, lepton asymmetry and baryon asymmetry together, last one being the most stringent one. |
0810.5401 | Jihn E. Kim | Jihn E. Kim | Dark Matter Related to Axion and Axino | 9 pages. Talk presented at IDM08 | PoS idm2008:066,2008 | null | null | hep-ph astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I discuss the essential features of the QCD axion: the strong CP solution and
hence its theoretical necessity. I also review the axion and axino effects on
astrophysics and cosmology, in particular with emphasis on their role in the
dark matter component in the universe.
| [
{
"created": "Thu, 30 Oct 2008 02:07:00 GMT",
"version": "v1"
}
] | 2010-02-17 | [
[
"Kim",
"Jihn E.",
""
]
] | I discuss the essential features of the QCD axion: the strong CP solution and hence its theoretical necessity. I also review the axion and axino effects on astrophysics and cosmology, in particular with emphasis on their role in the dark matter component in the universe. |
hep-ph/0307169 | Shin'ichiro Ando | Shin'ichiro Ando | Decaying neutrinos and implications from the supernova relic neutrino
observation | 15 pages, 2 figures, corrected typos, added references. Final version
to appear in Physics Letters B | Phys.Lett. B570 (2003) 11 | 10.1016/j.physletb.2003.07.009 | UTAP-453 | hep-ph astro-ph | null | We propose that supernova relic neutrino (SRN) observation can be used to set
constraints on the neutrino decay models. Because of the long distance scale
from cosmological supernovae to the Earth, SRN have possibility to provide much
stronger limit than the present one obtained from solar neutrino observation.
Since the currently available data are only the upper limit on the flux
integrated over $E_{\bar\nu_e}>19.3$ MeV, the decay models on which we can set
constraints is quite restricted; they must satisfy specific conditions such
that the daughter neutrinos are active species, the neutrino mass spectrum is
quasi-degenerate, and the neutrino mass hierarchy is normal. Our numerical
calculation clearly indicates that the neutrino decay model with
$(\tau_2/m,\tau_3/m)\alt (10^{10},10^{10})$ [s/eV], where $\tau_i$ represents
the lifetime of mass eigenstates $\bar\nu_i$, appears to give the SRN flux that
is larger than the current upper limit. However, since the theoretical SRN
prediction contains many uncertainties concerning a supernova rate in the
universe or simulation of supernova explosions, we cannot conclude that there
exists the excluded parameter region of the neutrino lifetime. In the near
future, further reduced upper limit is actually expected, and it will provide
more severe constraints on the neutrino decay models.
| [
{
"created": "Sun, 13 Jul 2003 08:25:16 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Aug 2003 12:04:22 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Ando",
"Shin'ichiro",
""
]
] | We propose that supernova relic neutrino (SRN) observation can be used to set constraints on the neutrino decay models. Because of the long distance scale from cosmological supernovae to the Earth, SRN have possibility to provide much stronger limit than the present one obtained from solar neutrino observation. Since the currently available data are only the upper limit on the flux integrated over $E_{\bar\nu_e}>19.3$ MeV, the decay models on which we can set constraints is quite restricted; they must satisfy specific conditions such that the daughter neutrinos are active species, the neutrino mass spectrum is quasi-degenerate, and the neutrino mass hierarchy is normal. Our numerical calculation clearly indicates that the neutrino decay model with $(\tau_2/m,\tau_3/m)\alt (10^{10},10^{10})$ [s/eV], where $\tau_i$ represents the lifetime of mass eigenstates $\bar\nu_i$, appears to give the SRN flux that is larger than the current upper limit. However, since the theoretical SRN prediction contains many uncertainties concerning a supernova rate in the universe or simulation of supernova explosions, we cannot conclude that there exists the excluded parameter region of the neutrino lifetime. In the near future, further reduced upper limit is actually expected, and it will provide more severe constraints on the neutrino decay models. |
hep-ph/0502009 | Shmatov Sergei | I.Golutvin, E.Rogalev, M.Savina, S.Shmatov | Search for new heavy resonances at the LHC | 7 pages, 6 figures, The talk given at the XVIIIth International
Workshop "High Energy Physics and Quantum Field Theory", 17-23 June 2004, St.
Petersburg, Russia | null | null | null | hep-ph | null | In this article we carry out an analysis of LHC potential to search for new
dimuon resonance states from extended gauge models and the Randall-Sundrum
scenario of TeV-scale gravity.
| [
{
"created": "Tue, 1 Feb 2005 16:04:54 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Feb 2005 07:49:22 GMT",
"version": "v2"
},
{
"created": "Sat, 12 Feb 2005 11:58:06 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Golutvin",
"I.",
""
],
[
"Rogalev",
"E.",
""
],
[
"Savina",
"M.",
""
],
[
"Shmatov",
"S.",
""
]
] | In this article we carry out an analysis of LHC potential to search for new dimuon resonance states from extended gauge models and the Randall-Sundrum scenario of TeV-scale gravity. |
1810.06958 | Wolfgang Lucha | Wolfgang Lucha | Bethe-Salpeter-Motivated Modelling of Pseudo-Goldstone Pseudoscalar
Mesons | 8 pages, 3 figures, contributed to "XIII Quark Confinement and the
Hadron Spectrum - Confinement2018" (31 July - 6 August 2018, Maynooth
University, Ireland) | PoS Confinement2018 (2019) 251 | null | HEPHY-PUB 1007/18 (2018) | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We apply a description of bound states of fermion and antifermion by means of
our approximation to the Bethe-Salpeter formalism that retains part of the
information on relativistic effects provided by the full fermion propagator to
the lightest pseudoscalar mesons. Therein, the pseudo-Goldstone nature of the
latter quark-antiquark bound states is taken into account by appropriately
formulated effective interactions. Scrutinizing the predictions of this
bound-state approach for meson masses, decay constants and in-meson condensates
by relying on a generalized Gell-Mann-Oakes-Renner relation shows that the
light-quark-mass values required for agreement are all in the right ballpark.
| [
{
"created": "Tue, 16 Oct 2018 12:46:45 GMT",
"version": "v1"
}
] | 2019-06-20 | [
[
"Lucha",
"Wolfgang",
""
]
] | We apply a description of bound states of fermion and antifermion by means of our approximation to the Bethe-Salpeter formalism that retains part of the information on relativistic effects provided by the full fermion propagator to the lightest pseudoscalar mesons. Therein, the pseudo-Goldstone nature of the latter quark-antiquark bound states is taken into account by appropriately formulated effective interactions. Scrutinizing the predictions of this bound-state approach for meson masses, decay constants and in-meson condensates by relying on a generalized Gell-Mann-Oakes-Renner relation shows that the light-quark-mass values required for agreement are all in the right ballpark. |
hep-ph/0002266 | Andrey Grozin | A.G.Grozin | Calculating three-loop diagrams in Heavy Quark Effective Theory with
integration-by-parts recurrence relations | LaTeX2e (JHEP documentclass), 33 pages, 13 eps figures included. The
complete paper is also available via the www at
http://www-ttp.physik.uni-karlsruhe.de/Preprints/ V2: bug fixes in formulas,
improvements of the algorithm, some restructuring. REDUCE package Grinder is
available at http://www-ttp.physik.uni-karlsruhe.de/Progdata/ttp00/ttp00-01/ | JHEP 0003:013,2000 | 10.1088/1126-6708/2000/03/013 | TTP00-01 | hep-ph | null | An algorithm for calculation of three-loop propagator diagrams in HQET, based
on integration-by-parts recurrence relations, is constructed and implemented as
a REDUCE package Grinder, and in Axiom.
| [
{
"created": "Fri, 25 Feb 2000 12:37:31 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Aug 2000 13:53:36 GMT",
"version": "v2"
}
] | 2011-04-20 | [
[
"Grozin",
"A. G.",
""
]
] | An algorithm for calculation of three-loop propagator diagrams in HQET, based on integration-by-parts recurrence relations, is constructed and implemented as a REDUCE package Grinder, and in Axiom. |
hep-ph/0611271 | Zhi-Gang Wang | Z. G. Wang (NCEPU, Baoding) | Structure of the axial-vector meson $D_{s1}(2460)$ and the strong
coupling constant $g_{D_{s1} D^* K}$ with the light-cone QCD sum rules | 17 pages, 7 figures, revised version. In the first version, I take
the value $f_{D_{s1}}= (0.25\pm0.02)GeV$ in numerical calculation, in the
revised version, I take a small value $f_{D_{s1}}=(0.225 \pm0.020)GeV$, the
value of the strong coupling constant is also changed | J.Phys.G34:753-765,2007 | 10.1088/0954-3899/34/4/011 | null | hep-ph | null | In this article, we take the point of view that the charmed axial-vector
meson $D_{s1}(2460)$ is the conventional $c\bar{s}$ meson and calculate the
strong coupling constant $g_{D_{s1} D^* K}$ in the framework of the light-cone
QCD sum rules approach. The numerical values of strong coupling constants
$g_{D_{s1} D^* K}$ and $g_{D_{s0} D K}$ are very large, and support the
hadronic dressing mechanism. Just like the scalar mesons $f_0(980)$ and
$a_0(980)$, the scalar meson $D_{s0}(2317)$ and axial-vector meson
$D_{s1}(2460)$ may have small $c\bar{s}$ kernels of the typical $c\bar{s}$
meson size, the strong couplings to the hadronic channels (or the virtual
mesons loops) may result in smaller masses than the conventional $c\bar{s}$
mesons in the constituent quark models, and enrich the pure $c\bar{s}$ states
with other components.
| [
{
"created": "Tue, 21 Nov 2006 15:17:07 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Nov 2006 03:13:47 GMT",
"version": "v2"
},
{
"created": "Sun, 4 Feb 2007 01:57:45 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Wang",
"Z. G.",
"",
"NCEPU, Baoding"
]
] | In this article, we take the point of view that the charmed axial-vector meson $D_{s1}(2460)$ is the conventional $c\bar{s}$ meson and calculate the strong coupling constant $g_{D_{s1} D^* K}$ in the framework of the light-cone QCD sum rules approach. The numerical values of strong coupling constants $g_{D_{s1} D^* K}$ and $g_{D_{s0} D K}$ are very large, and support the hadronic dressing mechanism. Just like the scalar mesons $f_0(980)$ and $a_0(980)$, the scalar meson $D_{s0}(2317)$ and axial-vector meson $D_{s1}(2460)$ may have small $c\bar{s}$ kernels of the typical $c\bar{s}$ meson size, the strong couplings to the hadronic channels (or the virtual mesons loops) may result in smaller masses than the conventional $c\bar{s}$ mesons in the constituent quark models, and enrich the pure $c\bar{s}$ states with other components. |
1508.01194 | Gouranga Nayak | Gouranga C. Nayak | Violation of Factorization Theorem in QCD and QED For Non-Light-Like
Wilson Line | 51 pages latex. arXiv admin note: substantial text overlap with
arXiv:1506.02651, arXiv:1506.02593, arXiv:1506.07146 | null | null | null | hep-ph hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By using path integral formulation of QCD and QED we prove that the
factorization theorem is valid for light-like Wilson line but is not valid for
non-light-like Wilson line. This conclusion is shown to be consistent with Ward
identity and Grammer-Yennie approximation. Hence we find that the factorization
theorem is violated in all the previous studies which used the non-light-like
Wilson line in the definition of the (transverse momentum dependent) parton
distribution function and fragmentation function at high energy colliders.
| [
{
"created": "Wed, 5 Aug 2015 19:59:11 GMT",
"version": "v1"
}
] | 2015-08-07 | [
[
"Nayak",
"Gouranga C.",
""
]
] | By using path integral formulation of QCD and QED we prove that the factorization theorem is valid for light-like Wilson line but is not valid for non-light-like Wilson line. This conclusion is shown to be consistent with Ward identity and Grammer-Yennie approximation. Hence we find that the factorization theorem is violated in all the previous studies which used the non-light-like Wilson line in the definition of the (transverse momentum dependent) parton distribution function and fragmentation function at high energy colliders. |
0803.2977 | Wojciech Krolikowski | Wojciech Krolikowski | A Hidden Valley model of cold dark matter with photonic portal | 10 pages, Egs.(30) are added, Abstract is shortened | null | null | IFT-08/5 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the discussed model, the cold dark matter consists of Dirac spin-1/2
fermions, sterile from all Standard Model charges, where masses are generated
by a nonzero vacuum expectation value of a field of scalar bosons, also assumed
to be sterile. For convenience, these sterile particles have beeen called
sterinos and sterons, respectively. It has been conjectured that our sterile
world of sterinos and sterons can communicate with the familiar Standard Model
world not only through gravity, but also through a photonic portal provided by
a very weak effective interaction involving the electromagnetic field F_{\mu
\nu} = \partial_\mu A_\nu - \partial_\nu A_\mu coupled to the sterino and
steron fields.
| [
{
"created": "Thu, 20 Mar 2008 12:11:17 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Apr 2008 12:01:56 GMT",
"version": "v2"
}
] | 2008-04-15 | [
[
"Krolikowski",
"Wojciech",
""
]
] | In the discussed model, the cold dark matter consists of Dirac spin-1/2 fermions, sterile from all Standard Model charges, where masses are generated by a nonzero vacuum expectation value of a field of scalar bosons, also assumed to be sterile. For convenience, these sterile particles have beeen called sterinos and sterons, respectively. It has been conjectured that our sterile world of sterinos and sterons can communicate with the familiar Standard Model world not only through gravity, but also through a photonic portal provided by a very weak effective interaction involving the electromagnetic field F_{\mu \nu} = \partial_\mu A_\nu - \partial_\nu A_\mu coupled to the sterino and steron fields. |
2204.03660 | Jiang-Hao Yu | Hao-Lin Li, Yu-Han Ni, Ming-Lei Xiao, Jiang-Hao Yu | The Bottom-Up EFT: Complete UV Resonances of the SMEFT Operators | 125 pages, 10 figures, 33 tables, revised to match the published
version, references added | null | 10.1007/JHEP11(2022)170 | null | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | The standard model effective field theory (SMEFT) provides systematic
parameterization of all possible new physics above the electroweak scale.
According to the amplitude-operator correspondence, an effective operator can
be decomposed into a linear combination of several j-basis operators, which
correspond to local amplitudes carrying certain spin and gauge quantum numbers
in a particular scattering channel. Based on the Poincare and gauge symmetries
of scattering amplitude, we construct the j-basis using the Casimir method for
both the Lorentz and gauge sectors. The quantum numbers of the j-basis
operators fix the quantum numbers of any intermediate state in the
corresponding amplitudes, such as a UV resonance. This can be re-interpreted as
the j-basis/UV correspondence, thus obtaining the j-bases in all partitions of
fields for an operator amounts to finding all of its UV origins at tree level,
constituting the central part of the bottom-up EFT framework. Applying the
j-basis analysis to SMEFT, we obtain a complete list of possible tree-level UV
origins of the effective operators at the dimension 5, 6, 7, and all the
bosonic operators at the dimension 8.
| [
{
"created": "Thu, 7 Apr 2022 18:00:00 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Dec 2022 15:59:15 GMT",
"version": "v2"
}
] | 2022-12-21 | [
[
"Li",
"Hao-Lin",
""
],
[
"Ni",
"Yu-Han",
""
],
[
"Xiao",
"Ming-Lei",
""
],
[
"Yu",
"Jiang-Hao",
""
]
] | The standard model effective field theory (SMEFT) provides systematic parameterization of all possible new physics above the electroweak scale. According to the amplitude-operator correspondence, an effective operator can be decomposed into a linear combination of several j-basis operators, which correspond to local amplitudes carrying certain spin and gauge quantum numbers in a particular scattering channel. Based on the Poincare and gauge symmetries of scattering amplitude, we construct the j-basis using the Casimir method for both the Lorentz and gauge sectors. The quantum numbers of the j-basis operators fix the quantum numbers of any intermediate state in the corresponding amplitudes, such as a UV resonance. This can be re-interpreted as the j-basis/UV correspondence, thus obtaining the j-bases in all partitions of fields for an operator amounts to finding all of its UV origins at tree level, constituting the central part of the bottom-up EFT framework. Applying the j-basis analysis to SMEFT, we obtain a complete list of possible tree-level UV origins of the effective operators at the dimension 5, 6, 7, and all the bosonic operators at the dimension 8. |
hep-ph/9910296 | Francesco Vissani | Aseshkrishna Datta, Biswarup Mukhopadhyaya and Francesco Vissani | Tevatron Signatures of an R-parity Violating Supersymmetric Theory | 10 pages, 4 figures (ps files included). Matches published version | Phys.Lett. B492 (2000) 324-330 | 10.1016/S0370-2693(00)01104-7 | MRI-PHY/P990928, SISSA 115/99/EP | hep-ph hep-ex | null | We show that an R-parity violating supersymmetric scenario which can account
for the atmospheric nu(mu) deficit has testable signals at the Fermilab
Tevatron with upgraded energy and luminosity. The explanation of neutrino
masses and maximal nu(mu)-nu(tau) oscillation in terms of bilinear R-violating
terms in the superpotential associates comparable numbers of muons and tau's
resulting from decays of the lightest neutralino. We show that this should lead
to like-sign dimuons and ditaus with substantial rates, in a form that
separates them from standard model backgrounds and other signals of
supersymmetry. One here also has the possibility of completely reconstructing
the lightest neutralino.
| [
{
"created": "Mon, 11 Oct 1999 13:53:48 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Nov 2000 11:22:49 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Datta",
"Aseshkrishna",
""
],
[
"Mukhopadhyaya",
"Biswarup",
""
],
[
"Vissani",
"Francesco",
""
]
] | We show that an R-parity violating supersymmetric scenario which can account for the atmospheric nu(mu) deficit has testable signals at the Fermilab Tevatron with upgraded energy and luminosity. The explanation of neutrino masses and maximal nu(mu)-nu(tau) oscillation in terms of bilinear R-violating terms in the superpotential associates comparable numbers of muons and tau's resulting from decays of the lightest neutralino. We show that this should lead to like-sign dimuons and ditaus with substantial rates, in a form that separates them from standard model backgrounds and other signals of supersymmetry. One here also has the possibility of completely reconstructing the lightest neutralino. |
2301.00076 | Edilson Alfonso Reyes Rojas | E. A. Reyes R. and A. R. Fazio | Higgs Boson Mass Corrections at Three-Loops in the Top-Yukawa Sector of
the Standard Model | 10 pages, 4 figures | Phys. Rev. D 108, 053007, 2023 | 10.1103/PhysRevD.108.053007 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The search for new physics signals in Higgs precision measurements plays a
pivotal role in the High-Luminosity Large Hadron Collider (HL-LHC) and future
colliders programs. The Higgs properties are expected to be measured with great
experimental precision, implying higher-order perturbative computations of the
electroweak parameters from the theoretical side. In particular, the
renormalized Higgs boson mass parameter in the Standard Model shows significant
variation around the electroweak scale, resulting in a lower-bound theoretical
uncertainty that exceeds future collider expectations. A more stable result
under the renormalization group can be computed from a non-zero external
momentum Higgs self-energy, for which available calculations include 3-loop
corrections in the QCD sector. In this work, we present an additional
contribution by estimating the leading non-QCD 3-loop corrections to the mass
of the Higgs boson in the top-Yukawa sector of order $y_t^6$. The
momentum-dependent Higgs self-energy is computed in the tadpole-free scheme for
the Higgs vacuum expectation value in the Landau gauge, and the explicit
dependence upon the Higgs boson and top quark masses is shown. The obtained
result is expressed in dimensional regularization as a superposition of a set
of master integrals with coefficients that are free of poles in four space-time
dimensions, and the corrections are evaluated numerically by the sector
decomposition method.
| [
{
"created": "Sat, 31 Dec 2022 00:03:11 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Jan 2023 22:06:44 GMT",
"version": "v2"
},
{
"created": "Fri, 26 May 2023 19:41:11 GMT",
"version": "v3"
}
] | 2023-09-22 | [
[
"R.",
"E. A. Reyes",
""
],
[
"Fazio",
"A. R.",
""
]
] | The search for new physics signals in Higgs precision measurements plays a pivotal role in the High-Luminosity Large Hadron Collider (HL-LHC) and future colliders programs. The Higgs properties are expected to be measured with great experimental precision, implying higher-order perturbative computations of the electroweak parameters from the theoretical side. In particular, the renormalized Higgs boson mass parameter in the Standard Model shows significant variation around the electroweak scale, resulting in a lower-bound theoretical uncertainty that exceeds future collider expectations. A more stable result under the renormalization group can be computed from a non-zero external momentum Higgs self-energy, for which available calculations include 3-loop corrections in the QCD sector. In this work, we present an additional contribution by estimating the leading non-QCD 3-loop corrections to the mass of the Higgs boson in the top-Yukawa sector of order $y_t^6$. The momentum-dependent Higgs self-energy is computed in the tadpole-free scheme for the Higgs vacuum expectation value in the Landau gauge, and the explicit dependence upon the Higgs boson and top quark masses is shown. The obtained result is expressed in dimensional regularization as a superposition of a set of master integrals with coefficients that are free of poles in four space-time dimensions, and the corrections are evaluated numerically by the sector decomposition method. |
0710.2957 | Yoshiaki Yasui | Y. Yasui, T. Ueda, E. de Doncker, J. Fujimoto, N. Hamaguchi, T.
Ishikawa, Y. Shimizu and F. Yuasa | Status reports from the GRACE Group | 6 pages, 3 figures, Proceedings for the International Workshop
LCWS/ILC 2007, DESY in Hamburg, Germany, between May 30, 2007, and June 3,
2007 | ECONF C0705302:LOOP04,2007 | null | null | hep-ph | null | We discuss a new approach for the numerical evaluation of loop integrals. The
fully numerical calculations of an infrared one-loop vertex and a box diagram
are demonstrated. To perform these calculations, we apply an extrapolation
method based on the $\epsilon$-algorithm. In our approach, the super high
precision control in the numerical manipulation is essential to handle the
infrared singularity. We adopt a multi-precision library named {\tt HMLib} for
the precision control in the calculations.
| [
{
"created": "Tue, 16 Oct 2007 06:02:51 GMT",
"version": "v1"
}
] | 2009-02-16 | [
[
"Yasui",
"Y.",
""
],
[
"Ueda",
"T.",
""
],
[
"de Doncker",
"E.",
""
],
[
"Fujimoto",
"J.",
""
],
[
"Hamaguchi",
"N.",
""
],
[
"Ishikawa",
"T.",
""
],
[
"Shimizu",
"Y.",
""
],
[
"Yuasa",
"F.",
""
]
] | We discuss a new approach for the numerical evaluation of loop integrals. The fully numerical calculations of an infrared one-loop vertex and a box diagram are demonstrated. To perform these calculations, we apply an extrapolation method based on the $\epsilon$-algorithm. In our approach, the super high precision control in the numerical manipulation is essential to handle the infrared singularity. We adopt a multi-precision library named {\tt HMLib} for the precision control in the calculations. |
hep-ph/0303236 | Patrick Meade | C. Csaki, J. Hubisz, G.D. Kribs, P. Meade, J. Terning | Variations of Little Higgs Models and their Electroweak Constraints | 32 pages, 13 figures; revised discussion of SU(4)^4/SU(3)^4 model,
bound on f is slightly higher | Phys.Rev.D68:035009,2003 | 10.1103/PhysRevD.68.035009 | null | hep-ph | null | We calculate the tree-level electroweak precision constraints on a wide class
of little Higgs models including: variations of the Littlest Higgs SU(5)/SO(5),
SU(6)/Sp(6), and SU(4)^4/SU(3)^4. By performing a global fit to the precision
data we find that for generic regions of the parameter space the bound on the
symmetry breaking scale f is several TeV, where we have kept the normalization
of f constant in the different models. For example, the ``minimal''
implementation of SU(6)/Sp(6) is bounded by f>3.0 TeV throughout most of the
parameter space, and SU(4)^4/SU(3)^4 is bounded by f^2 = f_1^2+f_2^2 > (4.2
TeV)^2. In certain models, such as SU(4)^4/SU(3)^4, a large f does not directly
imply a large amount of fine tuning since the heavy fermion masses that
contribute to the Higgs mass can be lowered below f for a carefully chosen set
of parameters. We also find that for certain models (or variations) there exist
regions of parameter space in which the bound on f can be lowered into the
range 1-2 TeV. These regions are typically characterized by a small mixing
between heavy and standard model gauge bosons, and a small (or vanishing)
coupling between heavy U(1) gauge bosons and the light fermions. Whether such a
region of parameter space is natural or not is ultimately contingent on the UV
completion.
| [
{
"created": "Fri, 28 Mar 2003 17:26:14 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Jul 2003 20:25:31 GMT",
"version": "v2"
}
] | 2009-09-17 | [
[
"Csaki",
"C.",
""
],
[
"Hubisz",
"J.",
""
],
[
"Kribs",
"G. D.",
""
],
[
"Meade",
"P.",
""
],
[
"Terning",
"J.",
""
]
] | We calculate the tree-level electroweak precision constraints on a wide class of little Higgs models including: variations of the Littlest Higgs SU(5)/SO(5), SU(6)/Sp(6), and SU(4)^4/SU(3)^4. By performing a global fit to the precision data we find that for generic regions of the parameter space the bound on the symmetry breaking scale f is several TeV, where we have kept the normalization of f constant in the different models. For example, the ``minimal'' implementation of SU(6)/Sp(6) is bounded by f>3.0 TeV throughout most of the parameter space, and SU(4)^4/SU(3)^4 is bounded by f^2 = f_1^2+f_2^2 > (4.2 TeV)^2. In certain models, such as SU(4)^4/SU(3)^4, a large f does not directly imply a large amount of fine tuning since the heavy fermion masses that contribute to the Higgs mass can be lowered below f for a carefully chosen set of parameters. We also find that for certain models (or variations) there exist regions of parameter space in which the bound on f can be lowered into the range 1-2 TeV. These regions are typically characterized by a small mixing between heavy and standard model gauge bosons, and a small (or vanishing) coupling between heavy U(1) gauge bosons and the light fermions. Whether such a region of parameter space is natural or not is ultimately contingent on the UV completion. |
hep-ph/9410319 | Annemarie Blobel | Bernd A. Kniehl and Michael Spira | Two-Loop $ O(\alpha_sG_Fm_t^2)$ Correction to the $H\to b\bar b$ Decay
Rate | 16 p., Latex, 2 figures included (uuencoded PS-files), DESY 94-102 | Nucl.Phys. B432 (1994) 39-48 | 10.1016/0550-3213(94)90592-4 | null | hep-ph | null | We present the two-loop ${\cal O}(\alpha_sG_Fm_t^2)$ correction to the $b\bar
b$ decay rate of the Stan\-dard-Model Higgs boson, assuming that the $t$ quark
is much heavier than the Higgs boson. Apart from the universal correction
connected with the renormalizations of the wave function and the vacuum
expectation value of the Higgs field, this involves vertex corrections specific
to the presence of beauty in the final state. We calculate the latter by means
of a low-energy theorem. All would-be mass singularities related to the $b$
quark can be absorbed into the running Higgs-bottom Yukawa coupling. It turns
out that the total ${\cal O}(\alpha_sG_Fm_t^2)$ correction screens the leading
high-$m_t$ behaviour of the one-loop result by 71\% to 75\% for $M_H$ between
60~GeV and $2M_W$.
| [
{
"created": "Wed, 19 Oct 1994 13:33:03 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Kniehl",
"Bernd A.",
""
],
[
"Spira",
"Michael",
""
]
] | We present the two-loop ${\cal O}(\alpha_sG_Fm_t^2)$ correction to the $b\bar b$ decay rate of the Stan\-dard-Model Higgs boson, assuming that the $t$ quark is much heavier than the Higgs boson. Apart from the universal correction connected with the renormalizations of the wave function and the vacuum expectation value of the Higgs field, this involves vertex corrections specific to the presence of beauty in the final state. We calculate the latter by means of a low-energy theorem. All would-be mass singularities related to the $b$ quark can be absorbed into the running Higgs-bottom Yukawa coupling. It turns out that the total ${\cal O}(\alpha_sG_Fm_t^2)$ correction screens the leading high-$m_t$ behaviour of the one-loop result by 71\% to 75\% for $M_H$ between 60~GeV and $2M_W$. |
0907.3270 | Aram Kotzinian | Aram Kotzinian | Longitudinal target polarization dependence of anti-Lambda polarization
and polarized strangeness PDFs | Typos corrected. Reference to slides added | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The longitudinal polarization of anti-Lambda produced in the currant
fragmentation region of polarized lepton DIS off polarized and unpolarized
target is described both in the simple formalism with factorized fragmentation
functions as well as within intrinsic strangeness model using string
fragmentation implemented into event generator LEPTO.
It is demonstrated that the the measurement of anti-Lambda polarization and
its dependence on the target polarization can serve as a filter for
(un)polarized anti-strangeness distribution function of nucleon.
| [
{
"created": "Sun, 19 Jul 2009 08:21:33 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Jul 2009 11:39:42 GMT",
"version": "v2"
}
] | 2009-07-27 | [
[
"Kotzinian",
"Aram",
""
]
] | The longitudinal polarization of anti-Lambda produced in the currant fragmentation region of polarized lepton DIS off polarized and unpolarized target is described both in the simple formalism with factorized fragmentation functions as well as within intrinsic strangeness model using string fragmentation implemented into event generator LEPTO. It is demonstrated that the the measurement of anti-Lambda polarization and its dependence on the target polarization can serve as a filter for (un)polarized anti-strangeness distribution function of nucleon. |
1810.12002 | Li Lin Yang | Xiaofeng Xu, Li Lin Yang | Towards a new approximation for pair-production and
associated-production of the Higgs boson | v2: minor revisions | JHEP01(2019)211 | 10.1007/JHEP01(2019)211 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose that loop integrals with internal heavy particles can be evaluated
by expanding in the limit of small external masses. This provides a
systematically improvable approximation to the integrals in the entire phase
space, and works particularly well for the high energy tails of kinematic
distributions (where the usual $1/M$ expansions cease to be valid). We
demonstrate our method using Higgs boson pair production as an example. We find
that at both one-loop and two-loop, our method provides good approximations to
the integrals appearing in the scattering amplitudes. Comparing to existing
expansion methods, our method are not restricted to a special phase space
region. Combining our efficient method to compute the two-loop amplitude with
an infrared subtraction method for the real emission corrections, we expect to
have a fast and reliable tool to calculate the differential cross sections for
Higgs boson pair production. This will be useful for phenomenological studies
and for the extraction of the Higgs self-coupling from future experimental
data. Our method can also be applied to other processes, such as the associated
production of the Higgs boson with a jet or a $Z$ boson.
| [
{
"created": "Mon, 29 Oct 2018 08:53:14 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Jan 2019 07:00:07 GMT",
"version": "v2"
}
] | 2019-02-05 | [
[
"Xu",
"Xiaofeng",
""
],
[
"Yang",
"Li Lin",
""
]
] | We propose that loop integrals with internal heavy particles can be evaluated by expanding in the limit of small external masses. This provides a systematically improvable approximation to the integrals in the entire phase space, and works particularly well for the high energy tails of kinematic distributions (where the usual $1/M$ expansions cease to be valid). We demonstrate our method using Higgs boson pair production as an example. We find that at both one-loop and two-loop, our method provides good approximations to the integrals appearing in the scattering amplitudes. Comparing to existing expansion methods, our method are not restricted to a special phase space region. Combining our efficient method to compute the two-loop amplitude with an infrared subtraction method for the real emission corrections, we expect to have a fast and reliable tool to calculate the differential cross sections for Higgs boson pair production. This will be useful for phenomenological studies and for the extraction of the Higgs self-coupling from future experimental data. Our method can also be applied to other processes, such as the associated production of the Higgs boson with a jet or a $Z$ boson. |
1108.3482 | Jean-Paul Blaizot | Jean-Paul Blaizot | Quantum Fields at Finite Temperature "from tera to nano Kelvin" | Lectures delivered at Komaba campus of the University of Tokyo in
November and December, 2009. Published in Soryushiron-kenkyu (e-version)
http://www2.yukawa.kyoto-u.ac.jp/~sokened/sokendenshi/sokendenshi.htm | null | null | null | hep-ph cond-mat.quant-gas nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | These lectures introduce techniques that are used in the description of
systems of particles and fields at high temperature (or density). These methods
have a broad range of physical applications. We shall discuss two specific
applications: one related to hot and dense matter composed of quarks and
gluons, with temperatures in the tera Kelvin range, the other related to
Bose-Einstein condensation in ultra-cold gases, with temperatures in the nano
Kelvin range. As we shall see, in both systems, long wavelength collective
phenomena lead to similar features, in spite of the huge difference in orders
of magnitude of the respective energy scales.
| [
{
"created": "Wed, 17 Aug 2011 14:08:14 GMT",
"version": "v1"
}
] | 2011-08-18 | [
[
"Blaizot",
"Jean-Paul",
""
]
] | These lectures introduce techniques that are used in the description of systems of particles and fields at high temperature (or density). These methods have a broad range of physical applications. We shall discuss two specific applications: one related to hot and dense matter composed of quarks and gluons, with temperatures in the tera Kelvin range, the other related to Bose-Einstein condensation in ultra-cold gases, with temperatures in the nano Kelvin range. As we shall see, in both systems, long wavelength collective phenomena lead to similar features, in spite of the huge difference in orders of magnitude of the respective energy scales. |
hep-ph/0205089 | Stanislaw Tatur | J. Bartelski and S. Tatur | A new determination of polarized parton densities in the nucleon | latex 12 pages, 3 eps figures | Acta Phys.Polon. B34 (2003) 2731-2740 | null | null | hep-ph | null | In order to determine polarized parton distributions we have made a new NLO
QCD fit using all experimental data on spin asymmetries measured in the deep
inelastic scattering on different nucleon targets. The functional form of such
densities is based on MRST 2001 results for unpolarized ones . We get for
polarization of quarks (at Q^2 = 1 GeV^2): Delta u = 0.87, Delta d = -0.38,
Delta s = -0.04. The total quark polarization is rather big and we obtain:
Delta Sigma = 0.44. As a result of our fit we get a_3 = g_A = 1.24 the value
which is close to experimental number. With negligible Delta s and rather big
Delta Sigma (comparable to a_8) the results of our new fit are quite different
in character from other fits.
| [
{
"created": "Thu, 9 May 2002 17:41:38 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Jul 2002 16:39:43 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Bartelski",
"J.",
""
],
[
"Tatur",
"S.",
""
]
] | In order to determine polarized parton distributions we have made a new NLO QCD fit using all experimental data on spin asymmetries measured in the deep inelastic scattering on different nucleon targets. The functional form of such densities is based on MRST 2001 results for unpolarized ones . We get for polarization of quarks (at Q^2 = 1 GeV^2): Delta u = 0.87, Delta d = -0.38, Delta s = -0.04. The total quark polarization is rather big and we obtain: Delta Sigma = 0.44. As a result of our fit we get a_3 = g_A = 1.24 the value which is close to experimental number. With negligible Delta s and rather big Delta Sigma (comparable to a_8) the results of our new fit are quite different in character from other fits. |
2005.12424 | Jonathan Rosner | Marek Karliner and Jonathan L. Rosner | Interpretation of excited $\Omega_b$ signals | 12 pages, 1 figure. Version including proof corrections to be
published in Phys. Rev. D | Phys. Rev. D 102, 014027 (2020) | 10.1103/PhysRevD.102.014027 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently LHCb reported the discovery of four extremely narrow excited
$\Omega_b$ baryons decaying into $\Xi_b^0 K^-$. We interpret these baryons as
bound states of a $b$-quark and a $P$-wave $ss$-diquark. For such a system
there are exactly five possible combinations of spin and orbital angular
momentum. We predict two of spin 1/2, two of spin 3/2, and one of spin 5/2, all
with negative parity. We favor identifying the observed states as those those
with spins 1/2 and 3/2, and give a range of predicted masses for the one with
spin 5/2. We update earlier predictions for these states based on the five
narrow excited $\Omega_c$ states reported by LHCb. An alternative picture of
the states in which one of $J=1/2$ is extremely wide and hence not seen by LHCb
is discussed.
| [
{
"created": "Mon, 25 May 2020 21:58:22 GMT",
"version": "v1"
},
{
"created": "Sun, 31 May 2020 19:55:59 GMT",
"version": "v2"
},
{
"created": "Fri, 10 Jul 2020 23:03:15 GMT",
"version": "v3"
}
] | 2020-07-22 | [
[
"Karliner",
"Marek",
""
],
[
"Rosner",
"Jonathan L.",
""
]
] | Recently LHCb reported the discovery of four extremely narrow excited $\Omega_b$ baryons decaying into $\Xi_b^0 K^-$. We interpret these baryons as bound states of a $b$-quark and a $P$-wave $ss$-diquark. For such a system there are exactly five possible combinations of spin and orbital angular momentum. We predict two of spin 1/2, two of spin 3/2, and one of spin 5/2, all with negative parity. We favor identifying the observed states as those those with spins 1/2 and 3/2, and give a range of predicted masses for the one with spin 5/2. We update earlier predictions for these states based on the five narrow excited $\Omega_c$ states reported by LHCb. An alternative picture of the states in which one of $J=1/2$ is extremely wide and hence not seen by LHCb is discussed. |
hep-ph/9308321 | JoAnne Hewett | J.L. Hewett | Extended Gauge Sectors at Linear Colliders | 24 pages (figures + text, figures available by request), LaTex,
ANL-HEP-CP-93-68 | null | null | null | hep-ph | null | Signatures of extended gauge models at high energy \epem\ linear colliders
are summarized. Talk presented at the Workshop on Physics and Experiments with
Linear \epem\ Colliders, Waikoloa, Hawaii, April 1993.
| [
{
"created": "Mon, 23 Aug 1993 15:59:26 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Hewett",
"J. L.",
""
]
] | Signatures of extended gauge models at high energy \epem\ linear colliders are summarized. Talk presented at the Workshop on Physics and Experiments with Linear \epem\ Colliders, Waikoloa, Hawaii, April 1993. |
2311.11327 | Ulas Ozdem | U. \"Ozdem | Analysis of the $Z_b(10650)$ state based on electromagnetic properties | 10 pages, 1 figure, version accepted by the European Physical Journal
C | null | null | null | hep-ph hep-ex hep-lat | http://creativecommons.org/licenses/by/4.0/ | In this study, the magnetic and quadrupole moments of the $Z_b(10650)$ state
are determined using the compact diquark-antidiquark interpolating current
through the QCD light-cone sum rule. The values that are obtained as a result
of the analysis are as follows: $\mu_{Z_b} = 2.35^{+0.34}_{-0.33}~\mu_N$ and
$\mathcal{D}_{Z_b} =(1.82^{+0.35}_{-0.31})\times 10^{-2}~\mbox{fm}^2$.
Examining the results obtained, it can be seen that the magnetic moments are
large enough to be measured experimentally, while the quadrupole moment is
obtained as a small but non-zero value, corresponding to a prolate charge
distribution. The magnetic moment is the leading-order response of a bound
system to a weak external magnetic field. It therefore provides an excellent
platform to probe the internal structures of hadrons governed by the
quark-gluon dynamics of QCD.
| [
{
"created": "Sun, 19 Nov 2023 13:47:46 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Jan 2024 17:26:55 GMT",
"version": "v2"
}
] | 2024-01-08 | [
[
"Özdem",
"U.",
""
]
] | In this study, the magnetic and quadrupole moments of the $Z_b(10650)$ state are determined using the compact diquark-antidiquark interpolating current through the QCD light-cone sum rule. The values that are obtained as a result of the analysis are as follows: $\mu_{Z_b} = 2.35^{+0.34}_{-0.33}~\mu_N$ and $\mathcal{D}_{Z_b} =(1.82^{+0.35}_{-0.31})\times 10^{-2}~\mbox{fm}^2$. Examining the results obtained, it can be seen that the magnetic moments are large enough to be measured experimentally, while the quadrupole moment is obtained as a small but non-zero value, corresponding to a prolate charge distribution. The magnetic moment is the leading-order response of a bound system to a weak external magnetic field. It therefore provides an excellent platform to probe the internal structures of hadrons governed by the quark-gluon dynamics of QCD. |
hep-ph/9904468 | Andre Hoang | A.H. Hoang (CERN), T. Teubner (DESY, Hamburg) | Top Quark Pair Production close to Threshold: Top Mass, Width and
Momentum Distribution | 53 pages, latex; minor changes, a number of typos corrected | Phys.Rev. D60 (1999) 114027 | 10.1103/PhysRevD.60.114027 | CERN-TH/99-59, DESY 99-047 | hep-ph | null | The complete NNLO QCD corrections to the total cross section $\sigma(e^+e^-
\to Z*,\gamma*\to t\bar t)$ in the kinematic region close to the top-antitop
threshold are calculated by solving the corresponding Schroedinger equations
exactly in momentum space in a consistent momentum cutoff regularization
scheme. The corrections coming from the same NNLO QCD effects to the top quark
three-momentum distribution $d\sigma/d |\vec k_t|$ are determined. We discuss
the origin of the large NNLO corrections to the peak position and the
normalization of the total cross section observed in previous works and propose
a new top mass definition, the 1S mass M_1S, which stabilizes the peak in the
total cross section. If the influence of beamstrahlung and initial state
radiation on the mass determination is small, a theoretical uncertainty on the
1S top mass measurement of 200 MeV from the total cross section at the linear
collider seems possible. We discuss how well the 1S mass can be related to the
$\bar{MS}$ mass. We propose a consistent way to implement the top quark width
at NNLO by including electroweak effects into the NRQCD matching coefficients,
which then can become complex.
| [
{
"created": "Tue, 27 Apr 1999 16:41:35 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Sep 1999 09:58:37 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Hoang",
"A. H.",
"",
"CERN"
],
[
"Teubner",
"T.",
"",
"DESY, Hamburg"
]
] | The complete NNLO QCD corrections to the total cross section $\sigma(e^+e^- \to Z*,\gamma*\to t\bar t)$ in the kinematic region close to the top-antitop threshold are calculated by solving the corresponding Schroedinger equations exactly in momentum space in a consistent momentum cutoff regularization scheme. The corrections coming from the same NNLO QCD effects to the top quark three-momentum distribution $d\sigma/d |\vec k_t|$ are determined. We discuss the origin of the large NNLO corrections to the peak position and the normalization of the total cross section observed in previous works and propose a new top mass definition, the 1S mass M_1S, which stabilizes the peak in the total cross section. If the influence of beamstrahlung and initial state radiation on the mass determination is small, a theoretical uncertainty on the 1S top mass measurement of 200 MeV from the total cross section at the linear collider seems possible. We discuss how well the 1S mass can be related to the $\bar{MS}$ mass. We propose a consistent way to implement the top quark width at NNLO by including electroweak effects into the NRQCD matching coefficients, which then can become complex. |
1907.03379 | Oleksandr Tomalak | Oleksandr Tomalak, Richard J Hill | Theory of elastic neutrino-electron scattering | 54 pages, 20 figures. v2: journal version; minor corrections, Section
5.4 added, references and supplementary file added, appendix K extended | Phys. Rev. D 101, 033006 (2020) | 10.1103/PhysRevD.101.033006 | FERMILAB-PUB-19-076-T | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Theoretical predictions for elastic neutrino-electron scattering have no
hadronic or nuclear uncertainties at leading order making this process an
important tool for normalizing neutrino flux. However, the process is subject
to large radiative corrections that differ according to experimental
conditions. In this paper, we collect new and existing results for total and
differential cross sections accompanied by radiation of one photon, $\nu e \to
\nu e (\gamma)$. We perform calculations within the Fermi effective theory and
provide analytic expressions for the electron energy spectrum and for the total
electromagnetic energy spectrum as well as for double- and triple-differential
cross sections with respect to electron energy, electron angle, photon energy,
and photon angle. We discuss illustrative applications to accelerator-based
neutrino experiments and provide the most precise up-to-date values of
neutrino-electron scattering cross sections. We present an analysis of
theoretical error, which is dominated by the $\sim 0.2 - 0.4\%$ uncertainty of
the hadronic correction. We also discuss how searches for new physics can be
affected by radiative corrections.
| [
{
"created": "Mon, 8 Jul 2019 01:37:15 GMT",
"version": "v1"
},
{
"created": "Sat, 22 Feb 2020 13:59:58 GMT",
"version": "v2"
}
] | 2020-02-26 | [
[
"Tomalak",
"Oleksandr",
""
],
[
"Hill",
"Richard J",
""
]
] | Theoretical predictions for elastic neutrino-electron scattering have no hadronic or nuclear uncertainties at leading order making this process an important tool for normalizing neutrino flux. However, the process is subject to large radiative corrections that differ according to experimental conditions. In this paper, we collect new and existing results for total and differential cross sections accompanied by radiation of one photon, $\nu e \to \nu e (\gamma)$. We perform calculations within the Fermi effective theory and provide analytic expressions for the electron energy spectrum and for the total electromagnetic energy spectrum as well as for double- and triple-differential cross sections with respect to electron energy, electron angle, photon energy, and photon angle. We discuss illustrative applications to accelerator-based neutrino experiments and provide the most precise up-to-date values of neutrino-electron scattering cross sections. We present an analysis of theoretical error, which is dominated by the $\sim 0.2 - 0.4\%$ uncertainty of the hadronic correction. We also discuss how searches for new physics can be affected by radiative corrections. |
1304.6447 | Mannque Rho | Hyun Kyu Lee and Mannque Rho | Dilatons in Dense Baryonic Matter | 7 pages, no figures | null | 10.1142/9789814566254_0036 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the role of dilaton, which is supposed to be representing a
special feature of scale symmetry of QCD, trace anomaly, in dense baryonic
matter. The idea that the scale symmetry breaking of QCD is responsible for the
spontaneous breaking of chiral symmetry is presented along the similar spirit
of Freund-Nambu model. The incorporation of dilaton field in the hidden local
symmetric parity doublet model is briefly sketched with the possible role of
dilaton at high density baryonic matter, the emergence of linear sigma model in
dilaton limit.
| [
{
"created": "Wed, 24 Apr 2013 00:05:18 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Lee",
"Hyun Kyu",
""
],
[
"Rho",
"Mannque",
""
]
] | We discuss the role of dilaton, which is supposed to be representing a special feature of scale symmetry of QCD, trace anomaly, in dense baryonic matter. The idea that the scale symmetry breaking of QCD is responsible for the spontaneous breaking of chiral symmetry is presented along the similar spirit of Freund-Nambu model. The incorporation of dilaton field in the hidden local symmetric parity doublet model is briefly sketched with the possible role of dilaton at high density baryonic matter, the emergence of linear sigma model in dilaton limit. |
hep-ph/9807497 | Krzysztof Golec-Biernat | K. Golec-Biernat and A. D. Martin | Off-diagonal parton distributions and their evolution | 22 pages, Latex, 6 ps figures. Improved presentation after
discussions with X.Ji and A.Radyushkin | Phys.Rev.D59:014029,1999 | 10.1103/PhysRevD.59.014029 | DTP/98/48 | hep-ph | null | We construct off-diagonal parton distributions defined on the interval 0 < X
< 1 starting from the off-forward distributions defined by Ji. We emphasize the
particular role played by the symmetry relations in the "ERBL-like" region. We
find the evolution equations for the off-diagonal distributions which conserve
these symmetries. We present numerical results of the evolution, and verify
that the analytic asymptotic forms of the parton distributions are reproduced.
We also compare the constructed off-diagonal distributions with the non-forward
distributions defined by Radyushkin and comment on the singularity structure of
the basic amplitude written in terms of the off-diagonal distributions.
| [
{
"created": "Sun, 26 Jul 1998 13:31:34 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Aug 1998 16:53:27 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Golec-Biernat",
"K.",
""
],
[
"Martin",
"A. D.",
""
]
] | We construct off-diagonal parton distributions defined on the interval 0 < X < 1 starting from the off-forward distributions defined by Ji. We emphasize the particular role played by the symmetry relations in the "ERBL-like" region. We find the evolution equations for the off-diagonal distributions which conserve these symmetries. We present numerical results of the evolution, and verify that the analytic asymptotic forms of the parton distributions are reproduced. We also compare the constructed off-diagonal distributions with the non-forward distributions defined by Radyushkin and comment on the singularity structure of the basic amplitude written in terms of the off-diagonal distributions. |
2106.10670 | Georgii Shestakov | N.N. Achasov, A.V. Kiselev, G.N. Shestakov | Semileptonic decays $D\to\eta\pi e^+\nu_e$ in the $a_0(980)$ region | 11 pages, 11 figures, v2: clarifications added, version published in
Phys. Rev. D | Phys. Rev. D 104, 016034 (2021) | 10.1103/PhysRevD.104.016034 | null | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The mechanism of the four-quark production of the light scalar isovector
four-quark state $a_0(980)$ in the $D\to\eta\pi e^+\nu_e$ decays is discussed.
It is shown that the characteristic features of the shape of the $\eta\pi$ mass
spectra expected in our scheme can serve as the indicator of the production
mechanism and internal structure of the $a_0(980)$ resonance.
| [
{
"created": "Sun, 20 Jun 2021 10:23:33 GMT",
"version": "v1"
},
{
"created": "Sat, 31 Jul 2021 04:48:20 GMT",
"version": "v2"
}
] | 2021-08-04 | [
[
"Achasov",
"N. N.",
""
],
[
"Kiselev",
"A. V.",
""
],
[
"Shestakov",
"G. N.",
""
]
] | The mechanism of the four-quark production of the light scalar isovector four-quark state $a_0(980)$ in the $D\to\eta\pi e^+\nu_e$ decays is discussed. It is shown that the characteristic features of the shape of the $\eta\pi$ mass spectra expected in our scheme can serve as the indicator of the production mechanism and internal structure of the $a_0(980)$ resonance. |
0901.4677 | Sourendu Gupta | Rajeev S. Bhalerao and Sourendu Gupta | Relativistic diffusion and heavy-ion collisions | 8 pages, 5 figures | Phys.Rev.C79:064901,2009 | 10.1103/PhysRevC.79.064901 | TIFR/TH/09-05 | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study first and second order theories of relativistic diffusion coupled to
hydrodynamics under the approximation, valid at mid-rapidity in the RHIC and
LHC, that conserved number densities are much smaller than the entropy density.
We identify experimentally accessible quantities of interest, and show that the
first and second order theories may lead to radically different evolutions of
these quantities. In the first order theory the memory of the initial state is
almost completely washed out, whereas in the second order theory it is possible
that freezeout occurs at a time when transient dynamics is still on, and the
memory of the initial state remains. There are observational consequences which
we touch upon. In the first order theory, and for initial conditions when the
second order theory mimics the first order, one may be able to put a bound on
the diffusion constant.
| [
{
"created": "Thu, 29 Jan 2009 13:37:03 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Feb 2009 09:32:35 GMT",
"version": "v2"
}
] | 2009-11-19 | [
[
"Bhalerao",
"Rajeev S.",
""
],
[
"Gupta",
"Sourendu",
""
]
] | We study first and second order theories of relativistic diffusion coupled to hydrodynamics under the approximation, valid at mid-rapidity in the RHIC and LHC, that conserved number densities are much smaller than the entropy density. We identify experimentally accessible quantities of interest, and show that the first and second order theories may lead to radically different evolutions of these quantities. In the first order theory the memory of the initial state is almost completely washed out, whereas in the second order theory it is possible that freezeout occurs at a time when transient dynamics is still on, and the memory of the initial state remains. There are observational consequences which we touch upon. In the first order theory, and for initial conditions when the second order theory mimics the first order, one may be able to put a bound on the diffusion constant. |
0907.0667 | Carlos A. Salgado | Nestor Armesto, Matteo Cacciari, Tetsufumi Hirano, James L. Nagle and
Carlos A. Salgado | Constraint fitting of experimental data with a jet quenching model
embedded in a hydrodynamical bulk medium | 21 pages, 11 eps figures. Experimental errors in figures 4-6 and
minor misprints corrected | J.Phys.G37:025104,2010 | 10.1088/0954-3899/37/2/025104 | null | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a global fit to single- and double-inclusive suppression data of
high-$p_T$ particles in central Au+Au collisions at top RHIC energy. We also
include in this analysis data on heavy quarks via their D and B meson
semi-leptonic decays (i.e. non-photonic electrons). The analysis is based on
the parton quenching weights for medium-induced gluon radiation computed in the
BDMPS approximation then embedded in a hydrodynamical description of the bulk
medium. Our results indicate that values of the transport coefficient $\hat q$
more than four times larger than perturbative estimates are preferred by
experimental data. This confirms previous calculations based on simpler
implementations of the medium geometry or only the single-inclusive
suppression. We also comment on the statistical compatibility of the heavy
quark data within a radiative only energy loss scenario, and on the sensitivity
of the results to nuclear modification of the parton distribution functions
(PDFs) and to assumptions on the energy loss during times in the collision
prior to the hydrodynamical behavior.}
| [
{
"created": "Fri, 3 Jul 2009 16:35:10 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Dec 2009 12:01:11 GMT",
"version": "v2"
}
] | 2010-01-21 | [
[
"Armesto",
"Nestor",
""
],
[
"Cacciari",
"Matteo",
""
],
[
"Hirano",
"Tetsufumi",
""
],
[
"Nagle",
"James L.",
""
],
[
"Salgado",
"Carlos A.",
""
]
] | We present a global fit to single- and double-inclusive suppression data of high-$p_T$ particles in central Au+Au collisions at top RHIC energy. We also include in this analysis data on heavy quarks via their D and B meson semi-leptonic decays (i.e. non-photonic electrons). The analysis is based on the parton quenching weights for medium-induced gluon radiation computed in the BDMPS approximation then embedded in a hydrodynamical description of the bulk medium. Our results indicate that values of the transport coefficient $\hat q$ more than four times larger than perturbative estimates are preferred by experimental data. This confirms previous calculations based on simpler implementations of the medium geometry or only the single-inclusive suppression. We also comment on the statistical compatibility of the heavy quark data within a radiative only energy loss scenario, and on the sensitivity of the results to nuclear modification of the parton distribution functions (PDFs) and to assumptions on the energy loss during times in the collision prior to the hydrodynamical behavior.} |
0902.2934 | Philipp M. Kostka | Stefan Antusch, Koushik Dutta and Philipp M. Kostka (MPI, Munich) | SUGRA Hybrid Inflation with Shift Symmetry | 7 pages, 3 figures; appendix and references added; version published
in PLB | Phys.Lett.B677:221-225,2009 | 10.1016/j.physletb.2009.05.043 | MPP-2009-18 | hep-ph astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a solution to the eta-problem in supergravity (SUGRA) hybrid
inflation using a Nambu-Goldstone-like shift symmetry within a new class of
models. The flatness of the tree-level inflaton potential is ensured by shift
symmetry invariance of the Kaehler potential, while a small symmetry breaking
term in the superpotential gives rise to a slope of the potential at
loop-level. In the proposed class of inflation models, potentially dangerous
couplings between the inflaton and the moduli sector are avoided. We also
discuss under which conditions the predicted spectral index can be in agreement
with the best-fit-value of the latest WMAP observation n_s ~ 0.96,
corresponding to a hilltop-type inflaton potential at loop-level.
| [
{
"created": "Tue, 17 Feb 2009 15:16:05 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Jun 2009 14:08:57 GMT",
"version": "v2"
}
] | 2010-04-21 | [
[
"Antusch",
"Stefan",
"",
"MPI, Munich"
],
[
"Dutta",
"Koushik",
"",
"MPI, Munich"
],
[
"Kostka",
"Philipp M.",
"",
"MPI, Munich"
]
] | We propose a solution to the eta-problem in supergravity (SUGRA) hybrid inflation using a Nambu-Goldstone-like shift symmetry within a new class of models. The flatness of the tree-level inflaton potential is ensured by shift symmetry invariance of the Kaehler potential, while a small symmetry breaking term in the superpotential gives rise to a slope of the potential at loop-level. In the proposed class of inflation models, potentially dangerous couplings between the inflaton and the moduli sector are avoided. We also discuss under which conditions the predicted spectral index can be in agreement with the best-fit-value of the latest WMAP observation n_s ~ 0.96, corresponding to a hilltop-type inflaton potential at loop-level. |
hep-ph/0212221 | Norma Mankoc Borstnik | N. S. Mankoc Borstnik, C. D. Froggatt, D. Lukman, M. Axenides, D.
Melikhov, B. Stech, D.B. Fairlie, P.H. Frampton, J.W. van Holten, J.L.
Petersen, L.V. Laperashvili, D.A. Ryzhikh, P. Olesen, L. Susskind, S.I.
Blinnikov, L.B. Okun, M.I. Vysotsky, Jeff Greensite | Proceedings to the Workshops ''What comes beyond the Standard model''
2000,2001, VOLUME 1: Festschrift dedicated to the 60th birthday of Holger
Bech Nielsen | The proceedings includes 13 papers of different authors. Editors were
N. S. Mankoc Borstnik, C. D. Froggatt, D. Lukman | Bled workshops in physics, Volume 2, No.2, DMFA Zaloznistvo,
Ljubljana, Dec. 2001 | null | null | hep-ph | null | The present volume is the collection of contributions by friends of Holger
Bech Nielsen for his 60th birthday.
Contents:
1.Unified internal space of spins and charges (N. Mankoc Borstnik)
2.Semitopological Q-Rings (M. Axenides) 3.Non-local axial anomalies in the
Standard model (D. Melikhov, B. Stech) 4.Could there be a fourth generation?
(C.D. Froggatt) 5.Another complex Bateman equation (D.B. Fairlie)
6.Non-associative loops for Holger Bech Nielsen (P.H. Frampton) 7.Particles,
fluids and vortices (J.W. van Holten) 8.Results on 2D current algebras (J.L.
Petersen) 9.Phase transition in gauge theories and the Planck scale physics
(L.V. Laperashvili and D.A. Ryzhikh) 10.Some remarks on the 'classical' large N
limit (P. Olesen) 11.String theory and the size of hadrons (L. Susskind)
12.Relativity and $c/sqrt3$ (S.I. Blinnikov, L.B. Okun and M.I. Vysotsky)
13.Vortices (Jeff Greensite)
| [
{
"created": "Mon, 16 Dec 2002 13:03:41 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Borstnik",
"N. S. Mankoc",
""
],
[
"Froggatt",
"C. D.",
""
],
[
"Lukman",
"D.",
""
],
[
"Axenides",
"M.",
""
],
[
"Melikhov",
"D.",
""
],
[
"Stech",
"B.",
""
],
[
"Fairlie",
"D. B.",
""
],
[
"Frampton",
"P. H.",
""
],
[
"van Holten",
"J. W.",
""
],
[
"Petersen",
"J. L.",
""
],
[
"Laperashvili",
"L. V.",
""
],
[
"Ryzhikh",
"D. A.",
""
],
[
"Olesen",
"P.",
""
],
[
"Susskind",
"L.",
""
],
[
"Blinnikov",
"S. I.",
""
],
[
"Okun",
"L. B.",
""
],
[
"Vysotsky",
"M. I.",
""
],
[
"Greensite",
"Jeff",
""
]
] | The present volume is the collection of contributions by friends of Holger Bech Nielsen for his 60th birthday. Contents: 1.Unified internal space of spins and charges (N. Mankoc Borstnik) 2.Semitopological Q-Rings (M. Axenides) 3.Non-local axial anomalies in the Standard model (D. Melikhov, B. Stech) 4.Could there be a fourth generation? (C.D. Froggatt) 5.Another complex Bateman equation (D.B. Fairlie) 6.Non-associative loops for Holger Bech Nielsen (P.H. Frampton) 7.Particles, fluids and vortices (J.W. van Holten) 8.Results on 2D current algebras (J.L. Petersen) 9.Phase transition in gauge theories and the Planck scale physics (L.V. Laperashvili and D.A. Ryzhikh) 10.Some remarks on the 'classical' large N limit (P. Olesen) 11.String theory and the size of hadrons (L. Susskind) 12.Relativity and $c/sqrt3$ (S.I. Blinnikov, L.B. Okun and M.I. Vysotsky) 13.Vortices (Jeff Greensite) |
hep-ph/0406330 | Thomas A. Trainor | R.J. Porter and T.A. Trainor | Soft and hard components of two-particle distributions on
($y_t,\eta,\phi$) from p-p collisions at $\sqrt{s} = 200$ GeV | 3 pages, 4 figures, Quark Matter 2004 poster writeup | null | null | null | hep-ph | null | We report measurements of large-scale two-particle correlations for 200 GeV
p-p collisions on momentum components transverse rapidity $y_t$ (pion mass
assigned), pseudorapidity $\eta$ and azimuth angle $\phi$. In both transverse
$y_t \otimes y_t$ and axial $(\eta\otimes\eta,\phi\otimes\phi) $ two-particle
subspaces we observe two components of correlation structure (soft and hard)
which we interpret respectively in terms of longitudinal string fragmentation
and transverse minimum-bias parton fragmentation (minijets). This combination
is also represented by Lund-model-based Monte Carlo simulations such as Pythia.
| [
{
"created": "Tue, 29 Jun 2004 23:43:03 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Porter",
"R. J.",
""
],
[
"Trainor",
"T. A.",
""
]
] | We report measurements of large-scale two-particle correlations for 200 GeV p-p collisions on momentum components transverse rapidity $y_t$ (pion mass assigned), pseudorapidity $\eta$ and azimuth angle $\phi$. In both transverse $y_t \otimes y_t$ and axial $(\eta\otimes\eta,\phi\otimes\phi) $ two-particle subspaces we observe two components of correlation structure (soft and hard) which we interpret respectively in terms of longitudinal string fragmentation and transverse minimum-bias parton fragmentation (minijets). This combination is also represented by Lund-model-based Monte Carlo simulations such as Pythia. |
0707.3090 | Thomas Schutzmeier | R. Boughezal, M. Czakon, T. Schutzmeier | NNLO fermionic corrections to the charm quark mass dependent matrix
elements in B -> X_s gamma | 11 pages, 3 figures, 1 table | JHEP 0709:072,2007 | 10.1088/1126-6708/2007/09/072 | null | hep-ph | null | We compute the virtual O(alpha_s^2) fermionic contributions to the charm
quark mass dependent matrix elements of the B -> X_s gamma decay. In the case
of a massless quark loop insertion into the gluon propagator, our result
obtained as an expansion in z=m_c^2/m_b^2 and an exact expression in terms of
multi-fold MB integrals, confirms the findings of Bieri, Greub and Steinhauser
[19]. We observe, however, large deviations in the case of a b-quark loop
insertion.The charm quark loop shows smaller, but still noticeable differences.
| [
{
"created": "Fri, 20 Jul 2007 15:27:50 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Aug 2007 09:11:17 GMT",
"version": "v2"
}
] | 2009-02-18 | [
[
"Boughezal",
"R.",
""
],
[
"Czakon",
"M.",
""
],
[
"Schutzmeier",
"T.",
""
]
] | We compute the virtual O(alpha_s^2) fermionic contributions to the charm quark mass dependent matrix elements of the B -> X_s gamma decay. In the case of a massless quark loop insertion into the gluon propagator, our result obtained as an expansion in z=m_c^2/m_b^2 and an exact expression in terms of multi-fold MB integrals, confirms the findings of Bieri, Greub and Steinhauser [19]. We observe, however, large deviations in the case of a b-quark loop insertion.The charm quark loop shows smaller, but still noticeable differences. |
2309.09743 | Humberto Reyes-Gonz\'alez | Humberto Reyes-Gonzalez, Riccardo Torre | The NFLikelihood: an unsupervised DNNLikelihood from Normalizing Flows | 16 pages, 5 figures, 11 tables. Minor revision | null | null | null | hep-ph cs.LG hep-ex | http://creativecommons.org/licenses/by/4.0/ | We propose the NFLikelihood, an unsupervised version, based on Normalizing
Flows, of the DNNLikelihood proposed in Ref.[1]. We show, through realistic
examples, how Autoregressive Flows, based on affine and rational quadratic
spline bijectors, are able to learn complicated high-dimensional Likelihoods
arising in High Energy Physics (HEP) analyses. We focus on a toy LHC analysis
example already considered in the literature and on two Effective Field Theory
fits of flavor and electroweak observables, whose samples have been obtained
throught the HEPFit code. We discuss advantages and disadvantages of the
unsupervised approach with respect to the supervised one and discuss possible
interplays of the two.
| [
{
"created": "Mon, 18 Sep 2023 13:13:47 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Apr 2024 13:14:45 GMT",
"version": "v2"
},
{
"created": "Thu, 16 May 2024 15:05:14 GMT",
"version": "v3"
}
] | 2024-05-17 | [
[
"Reyes-Gonzalez",
"Humberto",
""
],
[
"Torre",
"Riccardo",
""
]
] | We propose the NFLikelihood, an unsupervised version, based on Normalizing Flows, of the DNNLikelihood proposed in Ref.[1]. We show, through realistic examples, how Autoregressive Flows, based on affine and rational quadratic spline bijectors, are able to learn complicated high-dimensional Likelihoods arising in High Energy Physics (HEP) analyses. We focus on a toy LHC analysis example already considered in the literature and on two Effective Field Theory fits of flavor and electroweak observables, whose samples have been obtained throught the HEPFit code. We discuss advantages and disadvantages of the unsupervised approach with respect to the supervised one and discuss possible interplays of the two. |
hep-ph/9812398 | J. Raufeisen | J. Raufeisen, A.V. Tarasov and O.O. Voskresenskaya | Nuclear Shadowing in DIS at Moderately Small $x_B$ | 10 pages, 1 figure, uses svjour, svepj, minor misprints corrected,
results unchanged | Eur.Phys.J. A5 (1999) 173-182 | null | null | hep-ph | null | In the rest frame of the nucleus, shadowing is due to hadronic fluctuations
of the incoming virtual photon, which interact with the nucleons. We expand
these fluctuations in a basis of eigenstates of interaction and take only the
$q\bar q$ component of the hadronic structure of the photon into account. We
use a representation in which the $q\bar q$-pair has a definite transverse
size. Starting from the Dirac equation, we develop a path integral approach
that allows to sum all multiple scattering terms and accounts for fluctuations
of the transverse size of the pair, as well as for the finite lifetime of the
hadronic state. First numerical results hep-ph/9807211 have shown that higher
order scattering terms have a strong influence on the total cross section
$\sigma^{\gamma^*A}_{tot}$. The aim of this paper is to give a detailed
derivation of the formula for the total cross section.
| [
{
"created": "Wed, 16 Dec 1998 20:44:58 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Feb 1999 18:43:44 GMT",
"version": "v2"
},
{
"created": "Tue, 9 Mar 1999 18:44:40 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Raufeisen",
"J.",
""
],
[
"Tarasov",
"A. V.",
""
],
[
"Voskresenskaya",
"O. O.",
""
]
] | In the rest frame of the nucleus, shadowing is due to hadronic fluctuations of the incoming virtual photon, which interact with the nucleons. We expand these fluctuations in a basis of eigenstates of interaction and take only the $q\bar q$ component of the hadronic structure of the photon into account. We use a representation in which the $q\bar q$-pair has a definite transverse size. Starting from the Dirac equation, we develop a path integral approach that allows to sum all multiple scattering terms and accounts for fluctuations of the transverse size of the pair, as well as for the finite lifetime of the hadronic state. First numerical results hep-ph/9807211 have shown that higher order scattering terms have a strong influence on the total cross section $\sigma^{\gamma^*A}_{tot}$. The aim of this paper is to give a detailed derivation of the formula for the total cross section. |
hep-ph/9501336 | null | Zurab Berezhiani (INFN, Ferrara), Csaba Csaki and Lisa Randall (MIT) | Could the Supersymmetric Higgs Particles Naturally be Pseudo-Goldstone
Bosons? | 39 pages, plain LaTeX | Nucl.Phys.B444:61-91,1995 | 10.1016/0550-3213(95)00183-S | INFN-FE 01-95, MIT-CTP-2404 | hep-ph | null | The doublet-triplet splitting problem is perhaps the most problematic aspect
of supersymmetric grand unified theories. It can be argued that the most
natural reason for the Higgs doublets to be light is that they are
pseudo-Goldstone bosons associated with the spontaneous breakdown of an
accidental global symmetry. In this paper we discuss the possibility of
implementing this idea in the SU(6) model of refs. \cite{Zur,Bar2,Bar3,Bar4}.
We show that although it is simple to generate an accidental symmetry of the
renormalizable terms of the potential, it is quite difficult to construct a
model which allows for the preservation of the accidental symmetry in the
nonrenormalizable terms. We summarize the constraints on such models and then
give three different ways to construct a superpotential where the dangerous
mixing terms are sufficiently suppressed even in the presence of
nonrenormalizable operators. With these examples we demonstrate the existence
of consistent models implementing the Higgs as pseudo-Goldstone boson scheme.
We extend one of the three examples to include fermion masses. We also show
that when restricted to regular group embeddings the only possible models
without light triplets are trivial generalizations of the SU(6) model we
consider.
| [
{
"created": "Wed, 18 Jan 1995 22:29:32 GMT",
"version": "v1"
}
] | 2016-09-01 | [
[
"Berezhiani",
"Zurab",
"",
"INFN, Ferrara"
],
[
"Csaki",
"Csaba",
"",
"MIT"
],
[
"Randall",
"Lisa",
"",
"MIT"
]
] | The doublet-triplet splitting problem is perhaps the most problematic aspect of supersymmetric grand unified theories. It can be argued that the most natural reason for the Higgs doublets to be light is that they are pseudo-Goldstone bosons associated with the spontaneous breakdown of an accidental global symmetry. In this paper we discuss the possibility of implementing this idea in the SU(6) model of refs. \cite{Zur,Bar2,Bar3,Bar4}. We show that although it is simple to generate an accidental symmetry of the renormalizable terms of the potential, it is quite difficult to construct a model which allows for the preservation of the accidental symmetry in the nonrenormalizable terms. We summarize the constraints on such models and then give three different ways to construct a superpotential where the dangerous mixing terms are sufficiently suppressed even in the presence of nonrenormalizable operators. With these examples we demonstrate the existence of consistent models implementing the Higgs as pseudo-Goldstone boson scheme. We extend one of the three examples to include fermion masses. We also show that when restricted to regular group embeddings the only possible models without light triplets are trivial generalizations of the SU(6) model we consider. |
1609.05849 | Marcos A. Garcia Garcia | John Ellis, Marcos A. G. Garcia, Natsumi Nagata, Dimitri V.
Nanopoulos, Keith A. Olive | Starobinsky-Like Inflation and Neutrino Masses in a No-Scale SO(10)
Model | 38 pages, 8 figures | null | 10.1088/1475-7516/2016/11/018 | KCL-PH-TH/2016-54, CERN-PH-TH/2016-18, UT-16-29, ACT-05-16,
MI-TH-162, UMN-TH-3603/16, FTPI-MINN-16/26 | hep-ph astro-ph.CO gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using a no-scale supergravity framework, we construct an SO(10) model that
makes predictions for cosmic microwave background observables similar to those
of the Starobinsky model of inflation, and incorporates a double-seesaw model
for neutrino masses consistent with oscillation experiments and late-time
cosmology. We pay particular attention to the behaviour of the scalar fields
during inflation and the subsequent reheating.
| [
{
"created": "Mon, 19 Sep 2016 18:28:25 GMT",
"version": "v1"
}
] | 2016-11-15 | [
[
"Ellis",
"John",
""
],
[
"Garcia",
"Marcos A. G.",
""
],
[
"Nagata",
"Natsumi",
""
],
[
"Nanopoulos",
"Dimitri V.",
""
],
[
"Olive",
"Keith A.",
""
]
] | Using a no-scale supergravity framework, we construct an SO(10) model that makes predictions for cosmic microwave background observables similar to those of the Starobinsky model of inflation, and incorporates a double-seesaw model for neutrino masses consistent with oscillation experiments and late-time cosmology. We pay particular attention to the behaviour of the scalar fields during inflation and the subsequent reheating. |
1703.05750 | Ivo de Medeiros Varzielas | Ivo de Medeiros Varzielas | CP-odd invariants for multi-Higgs models and applications with discrete
symmetry | 9 pages. Contribution to the proceedings of DISCRETE 2016, Warsaw | null | 10.1088/1742-6596/873/1/012035 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | CP-odd invariants are useful for studying the CP properties of Lagrangians in
any basis. We explain how to build basis invariants for the scalar sector, and
how to distinguish CP-odd invariants from CP-even invariants. Up to a certain
order, we use these methods to systematically build all the CP-odd invariants.
The CP-odd invariants signal either explicit or spontaneous violation of CP.
Making use of the CP-odd invariants, we determine the CP properties of
potentials with 3 and with 6 Higgs fields arranged as triplets of specific
discrete symmetries in the $\Delta(3n^2)$ or $\Delta(6n^2)$ series (inlcuding
$A_4$, $S_4$, $\Delta(27)$ and $\Delta(54)$ as well as the cases for $n>3$).
| [
{
"created": "Thu, 16 Mar 2017 17:50:00 GMT",
"version": "v1"
}
] | 2017-09-13 | [
[
"Varzielas",
"Ivo de Medeiros",
""
]
] | CP-odd invariants are useful for studying the CP properties of Lagrangians in any basis. We explain how to build basis invariants for the scalar sector, and how to distinguish CP-odd invariants from CP-even invariants. Up to a certain order, we use these methods to systematically build all the CP-odd invariants. The CP-odd invariants signal either explicit or spontaneous violation of CP. Making use of the CP-odd invariants, we determine the CP properties of potentials with 3 and with 6 Higgs fields arranged as triplets of specific discrete symmetries in the $\Delta(3n^2)$ or $\Delta(6n^2)$ series (inlcuding $A_4$, $S_4$, $\Delta(27)$ and $\Delta(54)$ as well as the cases for $n>3$). |
1706.01765 | Roman Pasechnik | Yoshikazu Hagiwara, Yoshitaka Hatta, Roman Pasechnik, Marek Tasevsky
and Oleg Teryaev | Accessing the gluon Wigner distribution in ultraperipheral $pA$
collisions | 12 pages, 6 figures; a minor fix to Eq. (15); conclusions unchanged | Phys. Rev. D 96, 034009 (2017) | 10.1103/PhysRevD.96.034009 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose to constrain the gluon Wigner distribution in the nucleon by
studying the exclusive diffractive dijet production process in ultraperipheral
proton-nucleus collisions (UPCs) at RHIC and the LHC. Compared to the previous
proposal in Ref. [Y. Hatta, B. W. Xiao, and F. Yuan, Phys. Rev. Lett. 116,
202301 (2016).] to study the same observable in lepton-nucleon scattering, the
use of UPCs has a few advantages: not only is the cross section larger, but the
extraction of the Wigner distribution from the data also becomes simpler,
including its elliptic angular dependence. We compute the corresponding cross
section and evaluate the coefficients using models which include the gluon
saturation effects. A potential for the measurements of the Wigner distribution
at current and future experimental facilities is also discussed.
| [
{
"created": "Tue, 6 Jun 2017 13:45:38 GMT",
"version": "v1"
},
{
"created": "Sat, 12 Aug 2017 16:58:51 GMT",
"version": "v2"
},
{
"created": "Fri, 1 Dec 2017 15:48:19 GMT",
"version": "v3"
}
] | 2017-12-04 | [
[
"Hagiwara",
"Yoshikazu",
""
],
[
"Hatta",
"Yoshitaka",
""
],
[
"Pasechnik",
"Roman",
""
],
[
"Tasevsky",
"Marek",
""
],
[
"Teryaev",
"Oleg",
""
]
] | We propose to constrain the gluon Wigner distribution in the nucleon by studying the exclusive diffractive dijet production process in ultraperipheral proton-nucleus collisions (UPCs) at RHIC and the LHC. Compared to the previous proposal in Ref. [Y. Hatta, B. W. Xiao, and F. Yuan, Phys. Rev. Lett. 116, 202301 (2016).] to study the same observable in lepton-nucleon scattering, the use of UPCs has a few advantages: not only is the cross section larger, but the extraction of the Wigner distribution from the data also becomes simpler, including its elliptic angular dependence. We compute the corresponding cross section and evaluate the coefficients using models which include the gluon saturation effects. A potential for the measurements of the Wigner distribution at current and future experimental facilities is also discussed. |
1810.05454 | Filipe Rafael Joaquim | D. M. Barreiros, R. G. Felipe and F. R. Joaquim | Combining texture zeros with a remnant CP symmetry in the minimal type-I
seesaw | 29 pages, 8 figures. Analysis redone using a more suitable
parameterisation for the lepton mixing matrix. New results included, main
conclusions unchanged. References added. Final version published in JHEP | null | 10.1007/JHEP01(2019)223 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the framework of the two right-handed neutrino seesaw model, we consider
maximally-restrictive texture-zero patterns for the lepton Yukawa coupling and
mass matrices, together with the existence of a remnant CP symmetry. Under
these premisses, we find that several textures are compatible with the most
recent data coming from neutrino oscillation and neutrinoless double beta decay
experiments. It is shown that the number of allowed texture zeros depends on
the type of heavy right-handed neutrino mass spectrum. Namely, at most one
(two)-zero patterns are allowed in the Dirac Yukawa coupling matrix for
nondegenerate (degenerate) heavy Majorana neutrinos. The predictions for the
low-energy Dirac and Majorana CP-violating phases, and for the effective mass
parameter relevant in neutrinoless double-beta decay experiments, are presented
and discussed. We also comment on the impact of future experimental
improvements in scrutinising texture-zero patterns with a remnant CP symmetry,
within the minimal version of the seesaw mechanism considered here.
| [
{
"created": "Fri, 12 Oct 2018 11:32:11 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Feb 2019 19:09:13 GMT",
"version": "v2"
}
] | 2019-03-01 | [
[
"Barreiros",
"D. M.",
""
],
[
"Felipe",
"R. G.",
""
],
[
"Joaquim",
"F. R.",
""
]
] | In the framework of the two right-handed neutrino seesaw model, we consider maximally-restrictive texture-zero patterns for the lepton Yukawa coupling and mass matrices, together with the existence of a remnant CP symmetry. Under these premisses, we find that several textures are compatible with the most recent data coming from neutrino oscillation and neutrinoless double beta decay experiments. It is shown that the number of allowed texture zeros depends on the type of heavy right-handed neutrino mass spectrum. Namely, at most one (two)-zero patterns are allowed in the Dirac Yukawa coupling matrix for nondegenerate (degenerate) heavy Majorana neutrinos. The predictions for the low-energy Dirac and Majorana CP-violating phases, and for the effective mass parameter relevant in neutrinoless double-beta decay experiments, are presented and discussed. We also comment on the impact of future experimental improvements in scrutinising texture-zero patterns with a remnant CP symmetry, within the minimal version of the seesaw mechanism considered here. |
hep-ph/0511181 | Wahkeung Sze | W. K. Sze | The Fritzsch Ansatz Revisited | 7 pages | null | null | null | hep-ph | null | A modified Fritzsch ansatz for the quark mass matrices is proposed to account
for the hierarchical structure of the CKM matrix. To allow for the observed CP
asymmetry, restrictions have to be imposed on the relative phase degree of
freedom among the weak eigenstates of the quark fields, as for example by
certain additional symmetries. The ansatz can be accommodated in extensions to
the Standard Model, such as the multiple Higgs doublets models.
| [
{
"created": "Tue, 15 Nov 2005 09:57:04 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Sze",
"W. K.",
""
]
] | A modified Fritzsch ansatz for the quark mass matrices is proposed to account for the hierarchical structure of the CKM matrix. To allow for the observed CP asymmetry, restrictions have to be imposed on the relative phase degree of freedom among the weak eigenstates of the quark fields, as for example by certain additional symmetries. The ansatz can be accommodated in extensions to the Standard Model, such as the multiple Higgs doublets models. |
2006.10951 | Adriano Lana Cherchiglia | A. Cherchiglia, D. C. Arias-Perdomo, A. R. Vieira, M. Sampaio, and B.
Hiller | Two-loop renormalisation of gauge theories in $4D$ Implicit
Regularisation and connections to dimensional methods | Section 2 expanded, references revised, misprints corrected. Final
results unchanged. Comply with published version | null | 10.1140/epjc/s10052-021-09259-6 | null | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | We compute the two-loop $\beta$-function of scalar and spinorial quantum
electrodynamics as well as pure Yang-Mills and quantum chromodynamics using the
background field method in a fully quadridimensional setup using Implicit
Regularization (IREG). Moreover, a thorough comparison with dimensional
approaches such as conventional dimensional regularization (CDR) and
dimensional reduction (DRED) is presented. Subtleties related to Lorentz
algebra contractions/symmetric integrations inside divergent integrals as well
as renormalisation schemes are carefully discussed within IREG where the
renormalisation constants are fully defined as basic divergent integrals to
arbitrary loop order. Moreover, we confirm the hypothesis that momentum routing
invariance in the loops of Feynman diagrams implemented via setting
well-defined surface terms to zero deliver non-abelian gauge invariant
amplitudes within IREG just as it has been proven for abelian theories.
| [
{
"created": "Fri, 19 Jun 2020 04:09:49 GMT",
"version": "v1"
},
{
"created": "Sat, 26 Jun 2021 15:25:41 GMT",
"version": "v2"
}
] | 2021-06-29 | [
[
"Cherchiglia",
"A.",
""
],
[
"Arias-Perdomo",
"D. C.",
""
],
[
"Vieira",
"A. R.",
""
],
[
"Sampaio",
"M.",
""
],
[
"Hiller",
"B.",
""
]
] | We compute the two-loop $\beta$-function of scalar and spinorial quantum electrodynamics as well as pure Yang-Mills and quantum chromodynamics using the background field method in a fully quadridimensional setup using Implicit Regularization (IREG). Moreover, a thorough comparison with dimensional approaches such as conventional dimensional regularization (CDR) and dimensional reduction (DRED) is presented. Subtleties related to Lorentz algebra contractions/symmetric integrations inside divergent integrals as well as renormalisation schemes are carefully discussed within IREG where the renormalisation constants are fully defined as basic divergent integrals to arbitrary loop order. Moreover, we confirm the hypothesis that momentum routing invariance in the loops of Feynman diagrams implemented via setting well-defined surface terms to zero deliver non-abelian gauge invariant amplitudes within IREG just as it has been proven for abelian theories. |
1305.5101 | Leandro Cieri | Leandro Cieri | NNLO QCD results for diphoton production at the LHC and the Tevatron | 8 pages, 3 figures. Contribution to the proceedings of the XXVII
Rencontres de Physique de la Vall\'ee d'Aoste. arXiv admin note: substantial
text overlap with arXiv:1209.3143, arXiv:1207.3252 | null | 10.1393/ncc/i2014-11631-8 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider direct diphoton production in hadron collisions. We compute the
next-to-next-to-leading order (NNLO) QCD radiative corrections at the
fully-differential level. Our calculation is based on the q_T subtraction
formalism and it is implemented in a parton level Monte Carlo program, which
allows the user to apply arbitrary kinematical cuts on the final-state photons
and the associated jet activity, and to compute the corresponding distributions
in the form of bin histograms. We present selected numerical results related to
Higgs boson searches and diphoton studies performed at the LHC and the
Tevatron, and we show how the NNLO corrections to diphoton production are
relevant to understand the main background of the decay channel (H -> gamma
gamma) of the Higgs boson H.
| [
{
"created": "Wed, 22 May 2013 12:22:35 GMT",
"version": "v1"
}
] | 2022-03-02 | [
[
"Cieri",
"Leandro",
""
]
] | We consider direct diphoton production in hadron collisions. We compute the next-to-next-to-leading order (NNLO) QCD radiative corrections at the fully-differential level. Our calculation is based on the q_T subtraction formalism and it is implemented in a parton level Monte Carlo program, which allows the user to apply arbitrary kinematical cuts on the final-state photons and the associated jet activity, and to compute the corresponding distributions in the form of bin histograms. We present selected numerical results related to Higgs boson searches and diphoton studies performed at the LHC and the Tevatron, and we show how the NNLO corrections to diphoton production are relevant to understand the main background of the decay channel (H -> gamma gamma) of the Higgs boson H. |
hep-ph/0310127 | Roman Nevzorov | C.Froggatt (Glasgow U.), L.Laperashvili (Moscow, ITEP), R.Nevzorov
(Moscow, ITEP), H.B.Nielsen (Bohr Inst.) | Cosmological constant in SUGRA models and the multiple point principle | 18 pages, 2 figures, Talk given at Nuclear Physics Department of the
Russian Academy of Sciences (RAS) Conference on Physics of Fundamental
Interactions, Moscow, Russia, 2-6 Dec 2002; to appear in Phys.Atom.Nucl | Phys.Atom.Nucl.67:582-589,2004; Yad.Fiz.67:601-608,2004 | 10.1134/1.1690068 | null | hep-ph | null | The tiny order of magnitude of the cosmological constant is sought to be
explained in a model involving the following ingredients: supersymmetry
breaking in N=1 supergravity and the multiple point principle. We demonstrate
the viability of this scenario in the minimal SUGRA model.
| [
{
"created": "Fri, 10 Oct 2003 12:01:07 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Froggatt",
"C.",
"",
"Glasgow U."
],
[
"Laperashvili",
"L.",
"",
"Moscow, ITEP"
],
[
"Nevzorov",
"R.",
"",
"Moscow, ITEP"
],
[
"Nielsen",
"H. B.",
"",
"Bohr Inst."
]
] | The tiny order of magnitude of the cosmological constant is sought to be explained in a model involving the following ingredients: supersymmetry breaking in N=1 supergravity and the multiple point principle. We demonstrate the viability of this scenario in the minimal SUGRA model. |
hep-ph/0211445 | Alexei P. Martynenko | R.N. Faustov (Scientific Council for Cybernetics RAS), A.P. Martynenko
(Samara State University) | Nuclear structure corrections in the energy spectra of electronic and
muonic deuterium | Talk presented at the Conference "Physics of Fundamental
Interactions" of the Nuclear Physics Section of the Physics Department of
RAS, ITEP, Moscow, 2-6 December, 2002; 8 pages, REVTEX | Phys.Atom.Nucl. 67 (2004) 457-463; Yad.Fiz. 67 (2004) 477-483 | 10.1103/PhysRevA.67.052506 | Preprint SSU-HEP-02/11 | hep-ph | null | The one-loop nuclear structure corrections of order (Z alpha)^5 to the Lamb
shift and hyperfine splitting of the deuterium are calculated. The contribution
of the deuteron structure effects to the isotope shift (ep)-(ed), (mu p)-(mu d)
in the interval (1S - 2S) is obtained on the basis of modern experimental data
on the deuteron electromagnetic form factors. The comparison with the similar
contributions to the Lamb shift for electronic and muonic hydrogen shows, that
the relative contribution due to the nucleus structure increases when passing
from the hydrogen to the deuterium.
| [
{
"created": "Thu, 28 Nov 2002 15:38:47 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Nov 2002 14:38:32 GMT",
"version": "v2"
},
{
"created": "Sat, 14 Dec 2002 12:59:39 GMT",
"version": "v3"
},
{
"created": "Sat, 1 Mar 2003 13:11:54 GMT",
"version": "v4"
}
] | 2009-11-07 | [
[
"Faustov",
"R. N.",
"",
"Scientific Council for Cybernetics RAS"
],
[
"Martynenko",
"A. P.",
"",
"Samara State University"
]
] | The one-loop nuclear structure corrections of order (Z alpha)^5 to the Lamb shift and hyperfine splitting of the deuterium are calculated. The contribution of the deuteron structure effects to the isotope shift (ep)-(ed), (mu p)-(mu d) in the interval (1S - 2S) is obtained on the basis of modern experimental data on the deuteron electromagnetic form factors. The comparison with the similar contributions to the Lamb shift for electronic and muonic hydrogen shows, that the relative contribution due to the nucleus structure increases when passing from the hydrogen to the deuterium. |
hep-ph/0606066 | Rishi Sharma | Krishna Rajagopal, Rishi Sharma | The Crystallography of Strange Quark Matter | 6 pages, 3 figures. Contribution to the proceedings of Strangeness in
Quark Matter 2006, UCLA. Talk given by Rishi Sharma | J.Phys. G32 (2006) S483-S490 | 10.1088/0954-3899/32/12/S61 | MIT-CTP-3753 | hep-ph astro-ph cond-mat.supr-con nucl-th | null | Cold three-flavor quark matter at large (but not asymptotically large)
densities may exist as a crystalline color superconductor. We explore this
possibility by calculating the gap parameter Delta and free energy Omega(Delta)
for possible crystal structures within a Ginzburg-Landau approximation,
evaluating Omega(Delta) to order Delta^6. We develop a qualitative
understanding of what makes a crystal structure stable, and find two structures
with particularly large values of Delta and the condensation energy, within a
factor of two of those for the CFL phase known to characterize QCD at
asymptotically large densities. The robustness of these phases results in their
being favored over wide ranges of density and though it also implies that the
Ginzburg-Landau approximation is not quantitatively reliable, previous work
suggests that it can be trusted for qualitative comparisons between crystal
structures. We close with a look ahead at the calculations that remain to be
done in order to make contact with observed pulsar glitches and neutron star
cooling.
| [
{
"created": "Tue, 6 Jun 2006 17:45:23 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Rajagopal",
"Krishna",
""
],
[
"Sharma",
"Rishi",
""
]
] | Cold three-flavor quark matter at large (but not asymptotically large) densities may exist as a crystalline color superconductor. We explore this possibility by calculating the gap parameter Delta and free energy Omega(Delta) for possible crystal structures within a Ginzburg-Landau approximation, evaluating Omega(Delta) to order Delta^6. We develop a qualitative understanding of what makes a crystal structure stable, and find two structures with particularly large values of Delta and the condensation energy, within a factor of two of those for the CFL phase known to characterize QCD at asymptotically large densities. The robustness of these phases results in their being favored over wide ranges of density and though it also implies that the Ginzburg-Landau approximation is not quantitatively reliable, previous work suggests that it can be trusted for qualitative comparisons between crystal structures. We close with a look ahead at the calculations that remain to be done in order to make contact with observed pulsar glitches and neutron star cooling. |
hep-ph/0404069 | Mikhail Rogal | J\"urgen G. K\"orner, Zakaria Merebashvili and Mikhail Rogal | Towards a NNLO calculation in hadronic heavy hadron production | 5 pages, 2 Postscript figures | Springer Proc.Phys.98:477-480,2005 | 10.1007/3-540-26798-0_49 | null | hep-ph | null | We calculate the Laurent series expansion up to ${\cal O}(\epsilon^2)$ for
all scalar one-loop one-, two-, three- and four-point integrals that are needed
in the calculation of hadronic heavy flavour production. The Laurent series up
to ${\cal O}(\epsilon^2)$ is needed as input to that part of the NNLO
corrections to heavy hadron production at hadron colliders where the one-loop
integrals appear in the loop-by-loop contributions. The four-point integrals
are the most complicated. The ${\cal O}(\epsilon^2)$ expansion of the
four-point integrals contains polylogarithms up to $ Li_4$ and the multiple
polylogarithms.
| [
{
"created": "Wed, 7 Apr 2004 11:37:37 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Körner",
"Jürgen G.",
""
],
[
"Merebashvili",
"Zakaria",
""
],
[
"Rogal",
"Mikhail",
""
]
] | We calculate the Laurent series expansion up to ${\cal O}(\epsilon^2)$ for all scalar one-loop one-, two-, three- and four-point integrals that are needed in the calculation of hadronic heavy flavour production. The Laurent series up to ${\cal O}(\epsilon^2)$ is needed as input to that part of the NNLO corrections to heavy hadron production at hadron colliders where the one-loop integrals appear in the loop-by-loop contributions. The four-point integrals are the most complicated. The ${\cal O}(\epsilon^2)$ expansion of the four-point integrals contains polylogarithms up to $ Li_4$ and the multiple polylogarithms. |
1705.05944 | Alexander Studenikin | Alexande Studenikin | Electromagnetic properties of neutrinos: three new phenomena in neutrino
spin oscillations | 10 pages, the paper in the proceedings of the 19th International
Seminar on High Energy Physics QUARKS-2016 with minor modifications | EPJ Web Conf. 125 (2016) 04018 | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In studies of neutrino electromagnetic properties we discuss three very
interesting aspects related to neutrino spin oscillations. First we consider
neutrino mixing and oscillations in the mass and flavour bases under the
influence of a constant magnetic field with nonzero transversal and
longitudinal components. Then we discuss the effect of neutrino spin
oscillations induced by electroweak interactions of neutrino with moving matter
in case there is matter transversal current or polarization. In the final part
of the paper we discuss recently developed approach to description of neutrino
spin and spin-flavour oscillations in a constant magnetic field that is based
on the use of the exact neutrino stationary states in the magnetic field.
| [
{
"created": "Tue, 16 May 2017 22:22:03 GMT",
"version": "v1"
}
] | 2017-05-18 | [
[
"Studenikin",
"Alexande",
""
]
] | In studies of neutrino electromagnetic properties we discuss three very interesting aspects related to neutrino spin oscillations. First we consider neutrino mixing and oscillations in the mass and flavour bases under the influence of a constant magnetic field with nonzero transversal and longitudinal components. Then we discuss the effect of neutrino spin oscillations induced by electroweak interactions of neutrino with moving matter in case there is matter transversal current or polarization. In the final part of the paper we discuss recently developed approach to description of neutrino spin and spin-flavour oscillations in a constant magnetic field that is based on the use of the exact neutrino stationary states in the magnetic field. |
hep-ph/0212067 | Arata Hayashigaki | A. Hayashigaki, K. Suzuki and K. Tanaka | Diffractive \eta_c and \eta_b productions by neutrinos via neutral
currents | REVTex4, 4 pages with 3 embedded figures | Phys.Rev. D67 (2003) 093002 | 10.1103/PhysRevD.67.093002 | null | hep-ph nucl-th | null | We report a first theoretical study for neutrino-induced diffractive
productions of heavy pseudoscalar mesons, \eta_c and \eta_b, off a nucleon.
Based on factorization formalism for exclusive processes, we evaluate the
forward diffractive production cross section in perturbative QCD in terms of
the light-cone Q\bar{Q} wave functions (WFs) of \eta_{c,b} mesons and the gluon
distribution of the nucleon. The light-cone WFs of the \eta_c (\eta_b) meson
are constructed to satisfy the spin symmetry relations with those of the J/\psi
(\Upsilon) meson. The diffractive \eta_c production is governed by the
axial-vector coupling of the longitudinally polarized Z boson to Q\bar{Q} pair,
and the resulting \eta_c production rate is larger than the J/\psi one by one
order of magnitude. We also discuss the production of bottomonium \eta_b, which
shows up for higher beam energy.
| [
{
"created": "Wed, 4 Dec 2002 17:34:13 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Hayashigaki",
"A.",
""
],
[
"Suzuki",
"K.",
""
],
[
"Tanaka",
"K.",
""
]
] | We report a first theoretical study for neutrino-induced diffractive productions of heavy pseudoscalar mesons, \eta_c and \eta_b, off a nucleon. Based on factorization formalism for exclusive processes, we evaluate the forward diffractive production cross section in perturbative QCD in terms of the light-cone Q\bar{Q} wave functions (WFs) of \eta_{c,b} mesons and the gluon distribution of the nucleon. The light-cone WFs of the \eta_c (\eta_b) meson are constructed to satisfy the spin symmetry relations with those of the J/\psi (\Upsilon) meson. The diffractive \eta_c production is governed by the axial-vector coupling of the longitudinally polarized Z boson to Q\bar{Q} pair, and the resulting \eta_c production rate is larger than the J/\psi one by one order of magnitude. We also discuss the production of bottomonium \eta_b, which shows up for higher beam energy. |
hep-ph/0011244 | Elizabeth H. Simmons | Elizabeth H. Simmons | Top Physics | Lectures presented at TASI 2000, Flavor Physics for the Millennium,
June 4-30, 2000, University of Colorado, Boulder, CO. 44 pages, LaTeX with
included style file | null | 10.1142/9789812811509_0016 | BUHEP-00-23 | hep-ph hep-ex | null | The Run I experiments at the Fermilab Tevatron Collider discovered the top
quark and provided first measurements of many of its properties. Run II (and
eventually the LHC and NLC experiments) promise to extend our knowledge of the
top quark significantly. Understanding the top quark's large mass, and indeed
the origin of all mass, appears to require physics beyond the Standard Model.
Thus, the top quark may have unusual properties accessible to upcoming
experiments.
| [
{
"created": "Mon, 20 Nov 2000 15:38:48 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Dec 2000 19:38:22 GMT",
"version": "v2"
},
{
"created": "Wed, 20 Dec 2000 18:23:45 GMT",
"version": "v3"
}
] | 2017-08-23 | [
[
"Simmons",
"Elizabeth H.",
""
]
] | The Run I experiments at the Fermilab Tevatron Collider discovered the top quark and provided first measurements of many of its properties. Run II (and eventually the LHC and NLC experiments) promise to extend our knowledge of the top quark significantly. Understanding the top quark's large mass, and indeed the origin of all mass, appears to require physics beyond the Standard Model. Thus, the top quark may have unusual properties accessible to upcoming experiments. |
1606.09611 | Yuji Hirono | Yuji Hirono, Dmitri E. Kharzeev, Yi Yin | Quantized chiral magnetic current from reconnections of magnetic flux | 9 pages, 2 figures; ver2: published version | Phys. Rev. Lett. 117, 172301 (2016) | 10.1103/PhysRevLett.117.172301 | null | hep-ph cond-mat.str-el hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce a new mechanism for the chiral magnetic effect that does not
require an initial chirality imbalance. The chiral magnetic current is
generated by reconnections of magnetic flux that change the magnetic helicity
of the system. The resulting current is entirely determined by the change of
magnetic helicity, and it is quantized.
| [
{
"created": "Thu, 30 Jun 2016 18:46:21 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Oct 2016 00:41:15 GMT",
"version": "v2"
}
] | 2016-10-24 | [
[
"Hirono",
"Yuji",
""
],
[
"Kharzeev",
"Dmitri E.",
""
],
[
"Yin",
"Yi",
""
]
] | We introduce a new mechanism for the chiral magnetic effect that does not require an initial chirality imbalance. The chiral magnetic current is generated by reconnections of magnetic flux that change the magnetic helicity of the system. The resulting current is entirely determined by the change of magnetic helicity, and it is quantized. |
hep-ph/9409400 | null | Brian Mason and Marc Sher | Solar Neutrino Oscillations in the Moon | 30 pages, WM-94-114, latex, figures available by fax on request | null | null | null | hep-ph | null | The first three quarters of this paper consists of a pedagogical review of
neutrino oscillations, including vacuum oscillations, constant density matter
oscillations and variable density matter oscillations. We then address the
question of whether MSW solar neutrino oscillations in the moon could be
observed during a solar eclipse. For the small angle MSW solution, the effect
is unmeasureable; for the large angle solution, we find an enhancement in the
rate which can be as large as a factor of two. Since the center of the Sun, as
seen from a typical solar neutrino detector (through a transparent Earth) is
covered for roughly three hours per decade, a world-wide event rate of a few
solar neutrino events per hour might be sufficient to observe this effect. This
work constituted the undergraduate senior thesis of Brian Mason, and has been
submitted to the American Journal of Physics.
| [
{
"created": "Fri, 23 Sep 1994 19:35:47 GMT",
"version": "v1"
}
] | 2009-09-25 | [
[
"Mason",
"Brian",
""
],
[
"Sher",
"Marc",
""
]
] | The first three quarters of this paper consists of a pedagogical review of neutrino oscillations, including vacuum oscillations, constant density matter oscillations and variable density matter oscillations. We then address the question of whether MSW solar neutrino oscillations in the moon could be observed during a solar eclipse. For the small angle MSW solution, the effect is unmeasureable; for the large angle solution, we find an enhancement in the rate which can be as large as a factor of two. Since the center of the Sun, as seen from a typical solar neutrino detector (through a transparent Earth) is covered for roughly three hours per decade, a world-wide event rate of a few solar neutrino events per hour might be sufficient to observe this effect. This work constituted the undergraduate senior thesis of Brian Mason, and has been submitted to the American Journal of Physics. |
hep-ph/0011033 | Jiri Hosek | Jiri Hosek | On Superfluid Phases of Cold Deconfined QCD Matter at Moderate Baryon
Density | 9 pages, talk given at Les Rencontres de Physique de la Vallee
d'Aoste, February 27 - March 4, 2000, La Thuile, Italy | null | null | null | hep-ph | null | We present an overview of the arguments which lead to the picture that at low
temperatures the QCD matter not far above a critical confinement-deconfinement
density exists in one of several distinct superfluid phases exhibiting the
quantum behavior on macroscopic scales.
| [
{
"created": "Thu, 2 Nov 2000 14:19:22 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Hosek",
"Jiri",
""
]
] | We present an overview of the arguments which lead to the picture that at low temperatures the QCD matter not far above a critical confinement-deconfinement density exists in one of several distinct superfluid phases exhibiting the quantum behavior on macroscopic scales. |
1203.4868 | Roman Nikolaevich Lee | Roman N. Lee | DRA method: Powerful tool for the calculation of the loop integrals | 6 pages, contribution to ACAT2011 proceedings, Uxbridge, London,
September 5-9, 2011, typos are corrected | null | 10.1088/1742-6596/368/1/012050 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review the method of the calculation of multiloop integrals suggested in
Ref.\cite{Lee2010}.
| [
{
"created": "Thu, 22 Mar 2012 02:06:20 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Mar 2012 05:07:38 GMT",
"version": "v2"
}
] | 2015-06-04 | [
[
"Lee",
"Roman N.",
""
]
] | We review the method of the calculation of multiloop integrals suggested in Ref.\cite{Lee2010}. |
1809.00115 | Shunzo Kumano | S. Kumano (KEK/J-PARC) | Theoretical perspective for the future experiments on parton densities | 15 pages, LaTeX, 2 style files, 24 figure files, Plenary talk,
Proceedings of the XXVI International Workshop on Deep Inelastic Scattering
and Related Subjects (DIS2018), April 16-20, 2018, Port Island, Kobe, Japan | null | null | KEK-TH-2061, J-PARC-TH-0132 | hep-ph hep-ex hep-lat nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I explain the current status of parton-distribution-function (PDF) studies
and future experimental prospects on their determinations. First, unpolarized
PDFs of the nucleon are introduced as a field of precision QCD physics
including higher-order $\alpha_s$ corrections. Second, nuclear PDFs and
polarized nucleonic PDFs are discussed. Third, the determination of
fragmentation functions is explained. Forth, the three-dimensional (3D)
structure functions are discussed in connection with the origin of the nucleon
spin and gravitational form factors of hadrons. By the 3D structure functions,
gravitational sources and the origin of nucleon mass could be clarified in the
microscopic level of quarks and gluons. Furthermore, 3D structure studies of
hadrons could be used for clarifying internal structure of exotic hadron
candidates, nuclear composition of ultra-high-energy cosmic rays, and
color-entanglement phenomena. The PDF field will be developed further along
with progress in other fields of science.
| [
{
"created": "Sat, 1 Sep 2018 05:21:43 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Sep 2018 10:36:48 GMT",
"version": "v2"
}
] | 2018-09-17 | [
[
"Kumano",
"S.",
"",
"KEK/J-PARC"
]
] | I explain the current status of parton-distribution-function (PDF) studies and future experimental prospects on their determinations. First, unpolarized PDFs of the nucleon are introduced as a field of precision QCD physics including higher-order $\alpha_s$ corrections. Second, nuclear PDFs and polarized nucleonic PDFs are discussed. Third, the determination of fragmentation functions is explained. Forth, the three-dimensional (3D) structure functions are discussed in connection with the origin of the nucleon spin and gravitational form factors of hadrons. By the 3D structure functions, gravitational sources and the origin of nucleon mass could be clarified in the microscopic level of quarks and gluons. Furthermore, 3D structure studies of hadrons could be used for clarifying internal structure of exotic hadron candidates, nuclear composition of ultra-high-energy cosmic rays, and color-entanglement phenomena. The PDF field will be developed further along with progress in other fields of science. |
2006.07950 | Kirill Tuchin | Kirill Tuchin | Anomalous scattering and transport in chiral matter | 14 pages, v2: improved presentation, the role of the chiral
instability discussed, typos fixed | null | 10.1016/j.physletb.2020.135680 | null | hep-ph cond-mat.mes-hall nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Chiral anomaly modifies the scattering processes in chiral systems which can
be computed using the Maxwell-Chern-Simons theory that couples electrodynamics
to the pseudoscalar field $\theta$ describing the topological charge induced be
external sources. Assuming slow variation of the topological charge density,
the fermion scattering cross section is computed in the Born approximation and
is found to have a resonance at the scattering angles proportional to the
chiral conductivity. As a result, the transport coefficients are suppressed at
high temperatures. The anisotropy of the cross section arises due to the
spatial variation of the topological charge; its effect on the electrical
conductivity is discussed.
| [
{
"created": "Sun, 14 Jun 2020 16:37:55 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Aug 2020 21:09:23 GMT",
"version": "v2"
}
] | 2020-08-12 | [
[
"Tuchin",
"Kirill",
""
]
] | Chiral anomaly modifies the scattering processes in chiral systems which can be computed using the Maxwell-Chern-Simons theory that couples electrodynamics to the pseudoscalar field $\theta$ describing the topological charge induced be external sources. Assuming slow variation of the topological charge density, the fermion scattering cross section is computed in the Born approximation and is found to have a resonance at the scattering angles proportional to the chiral conductivity. As a result, the transport coefficients are suppressed at high temperatures. The anisotropy of the cross section arises due to the spatial variation of the topological charge; its effect on the electrical conductivity is discussed. |
1512.06828 | Martin Bauer | Martin Bauer and Matthias Neubert | Flavor Anomalies, the Diphoton Excess and a Dark Matter Candidate | 5 pages, 5 figures; Corrected typos, Plot edited, discussion extended | Phys. Rev. D 93, 115030 (2016) | 10.1103/PhysRevD.93.115030 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We argue that the diphoton excess recently reported by ATLAS and CMS can be
explained, along with several anomalies seen in the flavor sector, in models
where a Standard-Model singlet scalar resonance with mass $M \approx 750$ GeV
is produced in gluon fusion via loops containing a scalar color- triplet
leptoquark $\phi$. For a leptoquark mass $M_\phi \lesssim$ 1 TeV, the
production cross section is naturally in the 10 fb range. A large $S \to \gamma
\gamma$ branching ratio can be obtained by coupling the scalar S to new
color-singlet fermions $\chi$ with electroweak scale masses, which can be part
of an $SU(2)_L$ multiplet, whose neutral component has the right mass and
quantum numbers to be a dark matter candidate. Our model reveals a connection
between flavor anomalies, the nature of dark matter and a new scalar, which
acts as a mediator to the dark sector. The loop-mediated decay $S \to
\tau^+\tau^-$ could be a striking signature of this model.
| [
{
"created": "Mon, 21 Dec 2015 20:53:21 GMT",
"version": "v1"
},
{
"created": "Sat, 23 Jan 2016 09:41:48 GMT",
"version": "v2"
},
{
"created": "Tue, 28 Jun 2016 21:20:27 GMT",
"version": "v3"
}
] | 2016-07-06 | [
[
"Bauer",
"Martin",
""
],
[
"Neubert",
"Matthias",
""
]
] | We argue that the diphoton excess recently reported by ATLAS and CMS can be explained, along with several anomalies seen in the flavor sector, in models where a Standard-Model singlet scalar resonance with mass $M \approx 750$ GeV is produced in gluon fusion via loops containing a scalar color- triplet leptoquark $\phi$. For a leptoquark mass $M_\phi \lesssim$ 1 TeV, the production cross section is naturally in the 10 fb range. A large $S \to \gamma \gamma$ branching ratio can be obtained by coupling the scalar S to new color-singlet fermions $\chi$ with electroweak scale masses, which can be part of an $SU(2)_L$ multiplet, whose neutral component has the right mass and quantum numbers to be a dark matter candidate. Our model reveals a connection between flavor anomalies, the nature of dark matter and a new scalar, which acts as a mediator to the dark sector. The loop-mediated decay $S \to \tau^+\tau^-$ could be a striking signature of this model. |
hep-ph/9208235 | null | Y. Achiman and A. Lukas | E6 GUT and Large Neutrino Mixing | 10 pages, 7 Figures (not included), WUB 92-20, TUM-TH-149/92,
MPI-Ph/92-69 | Phys.Lett. B296 (1992) 127-131 | 10.1016/0370-2693(92)90813-J | null | hep-ph | null | All experimental results concerning possible neutrino oscillations are
naturally and simultaneously accounted for in an $E_6$ GUT model. The fermionic
mass matrices are dictated by the symmetry breaking and specific radiative
corrections and not by the use of ``Ans\"atze'' or discrete symmetries.
| [
{
"created": "Thu, 20 Aug 1992 15:38:18 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Achiman",
"Y.",
""
],
[
"Lukas",
"A.",
""
]
] | All experimental results concerning possible neutrino oscillations are naturally and simultaneously accounted for in an $E_6$ GUT model. The fermionic mass matrices are dictated by the symmetry breaking and specific radiative corrections and not by the use of ``Ans\"atze'' or discrete symmetries. |
hep-ph/0412286 | Johan Alwall | Johan Alwall | Sea Quark Asymmetries in the Nucleon - A physical model for parton
distributions in hadrons | 6 pages, 4 figures. Talk given at HSQCD, St. Petersburg, Russia, May
2004 | null | null | null | hep-ph | null | A physical model for parton densities in hadrons, based on Gaussian momentum
fluctuations of partons and hadronic baryon-meson fluctuations, is presented.
The model has previously been shown to describe proton structure function data,
and is now applied to sea quark asymmetries and shown to describe the dbar-ubar
asymmetry of the proton. By considering fluctuations involving strange quarks,
the model gives an asymmetry between the momentum distributions of s and sbar,
which would reduce the significance of the NuTeV anomaly.
| [
{
"created": "Mon, 20 Dec 2004 13:26:42 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Alwall",
"Johan",
""
]
] | A physical model for parton densities in hadrons, based on Gaussian momentum fluctuations of partons and hadronic baryon-meson fluctuations, is presented. The model has previously been shown to describe proton structure function data, and is now applied to sea quark asymmetries and shown to describe the dbar-ubar asymmetry of the proton. By considering fluctuations involving strange quarks, the model gives an asymmetry between the momentum distributions of s and sbar, which would reduce the significance of the NuTeV anomaly. |
hep-ph/0301163 | D. R. T. Jones | I. Jack and D.R.T. Jones | Yukawa Textures and Anomaly Mediated Supersymmetry Breaking | 33 pages, TeX, Uses Harvmac (big) and epsf. Added references and
minor changes and corrections. Improved texture discussion | Nucl.Phys.B662:63-88,2003 | 10.1016/S0550-3213(03)00310-9 | LTH 568 | hep-ph | null | We present a detailed analysis of how a mixed-anomaly-free U(1) symmetry can
be used to both resolve the slepton mass problem associated with Anomaly
Mediated Supersymmetry Breaking and generate the fermion mass hierarchy via the
Froggatt-Nielsen mechanism. Flavour changing neutral currents problems are
evaded by a specific form of the Yukawa textures.
| [
{
"created": "Mon, 20 Jan 2003 17:27:38 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Jan 2003 17:30:50 GMT",
"version": "v2"
},
{
"created": "Tue, 25 Mar 2003 15:03:30 GMT",
"version": "v3"
}
] | 2014-11-17 | [
[
"Jack",
"I.",
""
],
[
"Jones",
"D. R. T.",
""
]
] | We present a detailed analysis of how a mixed-anomaly-free U(1) symmetry can be used to both resolve the slepton mass problem associated with Anomaly Mediated Supersymmetry Breaking and generate the fermion mass hierarchy via the Froggatt-Nielsen mechanism. Flavour changing neutral currents problems are evaded by a specific form of the Yukawa textures. |
1505.05516 | Juan Gonzalez-Fraile | Tyler Corbett, Oscar J. P. Eboli, Dorival Goncalves, J.
Gonzalez-Fraile, Tilman Plehn, Michael Rauch | The Higgs Legacy of the LHC Run I | 29 pages, 15 figures | null | null | IPPP/15/32, DCPT/15/64 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Based on Run I data we present a comprehensive analysis of Higgs couplings.
For the first time this SFitter analysis includes independent tests of the
Higgs-gluon and top Yukawa couplings, Higgs decays to invisible particles, and
off-shell Higgs measurements. The observed Higgs boson is fully consistent with
the Standard Model, both in terms of coupling modifications and effective field
theory. Based only on Higgs total rates the results using both approaches are
essentially equivalent, with the exception of strong correlations in the
parameter space induced by effective operators. These correlations can be
controlled through additional experimental input, namely kinematic
distributions. Including kinematic distributions the typical Run I reach for
weakly interacting new physics now reaches 300 to 500 GeV.
| [
{
"created": "Wed, 20 May 2015 20:01:17 GMT",
"version": "v1"
}
] | 2015-05-27 | [
[
"Corbett",
"Tyler",
""
],
[
"Eboli",
"Oscar J. P.",
""
],
[
"Goncalves",
"Dorival",
""
],
[
"Gonzalez-Fraile",
"J.",
""
],
[
"Plehn",
"Tilman",
""
],
[
"Rauch",
"Michael",
""
]
] | Based on Run I data we present a comprehensive analysis of Higgs couplings. For the first time this SFitter analysis includes independent tests of the Higgs-gluon and top Yukawa couplings, Higgs decays to invisible particles, and off-shell Higgs measurements. The observed Higgs boson is fully consistent with the Standard Model, both in terms of coupling modifications and effective field theory. Based only on Higgs total rates the results using both approaches are essentially equivalent, with the exception of strong correlations in the parameter space induced by effective operators. These correlations can be controlled through additional experimental input, namely kinematic distributions. Including kinematic distributions the typical Run I reach for weakly interacting new physics now reaches 300 to 500 GeV. |
hep-ph/0304197 | Mircea Beciu | M. I. Beciu | Degenerate Rindler Vacuum | 11 pages, no figures | null | null | null | hep-ph gr-qc | null | We combine the creation and annihilation operators of a scalar field in
Minkowski spacetime to obtain the generators of the SU(1,1). We show that the
transformation between Minkowski and Rindler vacua can be represented by
(pseudo)rotation in the space of the SU(1,1) group. The root of this fact
originates from the coordinate transformation between Minkowski and Rindler
manifolds that can also be represented as a (pseudo)rotation in SU(1,1) group.
The group structure reveals that an independent (pseudo)rotation in the group
space must exist which leads to a new vacuum state, independent Rindler vacuum.
The newly defined state shares many of the properties of the Rindler vacuum
and, in particular, the theorem of thermalization remains valid for it.
| [
{
"created": "Mon, 21 Apr 2003 14:48:39 GMT",
"version": "v1"
}
] | 2009-09-29 | [
[
"Beciu",
"M. I.",
""
]
] | We combine the creation and annihilation operators of a scalar field in Minkowski spacetime to obtain the generators of the SU(1,1). We show that the transformation between Minkowski and Rindler vacua can be represented by (pseudo)rotation in the space of the SU(1,1) group. The root of this fact originates from the coordinate transformation between Minkowski and Rindler manifolds that can also be represented as a (pseudo)rotation in SU(1,1) group. The group structure reveals that an independent (pseudo)rotation in the group space must exist which leads to a new vacuum state, independent Rindler vacuum. The newly defined state shares many of the properties of the Rindler vacuum and, in particular, the theorem of thermalization remains valid for it. |
1508.01522 | Salvator Lombardo | Csaba Csaki, Eric Kuflik, Salvator Lombardo, Oren Slone | Searching for Displaced Higgs Decays | 10 pages, 12 figures, v3: displaced jet trigger corrected | Phys. Rev. D 92, 073008 (2015) | 10.1103/PhysRevD.92.073008 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a simplified model of the SM Higgs boson decaying to a degenerate
pair of scalars which travel a macroscopic distance before decaying to SM
particles. This is the leading signal for many well-motivated solutions to the
hierarchy problem that do not propose additional light colored particles.
Bounds for displaced Higgs decays below $10$ cm are found by recasting existing
tracker searches from Run I. New tracker search strategies, sensitive to the
characteristics of these models and similar decays, are proposed with
sensitivities projected for Run II at $\sqrt{s} = 13 $ TeV. With 20 fb$^{-1}$
of data, we find that Higgs branching ratios down to $7 \times 10^{-4}$ can be
probed for centimeter decay lengths.
| [
{
"created": "Thu, 6 Aug 2015 20:07:52 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Aug 2015 19:55:38 GMT",
"version": "v2"
},
{
"created": "Wed, 25 Nov 2015 22:09:08 GMT",
"version": "v3"
}
] | 2015-11-30 | [
[
"Csaki",
"Csaba",
""
],
[
"Kuflik",
"Eric",
""
],
[
"Lombardo",
"Salvator",
""
],
[
"Slone",
"Oren",
""
]
] | We study a simplified model of the SM Higgs boson decaying to a degenerate pair of scalars which travel a macroscopic distance before decaying to SM particles. This is the leading signal for many well-motivated solutions to the hierarchy problem that do not propose additional light colored particles. Bounds for displaced Higgs decays below $10$ cm are found by recasting existing tracker searches from Run I. New tracker search strategies, sensitive to the characteristics of these models and similar decays, are proposed with sensitivities projected for Run II at $\sqrt{s} = 13 $ TeV. With 20 fb$^{-1}$ of data, we find that Higgs branching ratios down to $7 \times 10^{-4}$ can be probed for centimeter decay lengths. |
hep-ph/9207275 | null | M. S. Berger | Test of an Equivalence Theorem at One-Loop | 8 pages + 4 figures available on request, MAD/PH/712 | null | null | null | hep-ph | null | We show that the equivalence theorem approximating one-loop gauge sector
diagrams by including only Goldstone bosons in the loop gives a remarkably poor
approximation to the amplitude for the decay $H\rightarrow \gamma \gamma $ and
for the process $\gamma \gamma \rightarrow HH$. At one loop, large logarithms
can arise that evade power counting arguments.
| [
{
"created": "Thu, 30 Jul 1992 22:34:30 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Berger",
"M. S.",
""
]
] | We show that the equivalence theorem approximating one-loop gauge sector diagrams by including only Goldstone bosons in the loop gives a remarkably poor approximation to the amplitude for the decay $H\rightarrow \gamma \gamma $ and for the process $\gamma \gamma \rightarrow HH$. At one loop, large logarithms can arise that evade power counting arguments. |
2104.06101 | Ahmed Gamal | Hesham Mansour, Ahmed Gamal | Meson Spectra using Nikiforov-Uvarov Method | 20 pages, 7 tables | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | There are many phenomenological potentials using different techniques to
describe the spectroscopy of the quarkonium systems like charmonium,
bottomonium, Bc meson systems. In the present work, we choose a
phenomenological potential (linear, Yukawa, and harmonic potentials) in the
framework of the nonrelativistic Schrodinger equation with relativistic
corrections using the Nikiforov-Uvarov (NU) method. We obtained the
eigenfunction and eigenvalue comparing the results with the available
experimental data. The results are in good agreement with the available
experimental data.
| [
{
"created": "Tue, 13 Apr 2021 11:08:13 GMT",
"version": "v1"
}
] | 2021-04-14 | [
[
"Mansour",
"Hesham",
""
],
[
"Gamal",
"Ahmed",
""
]
] | There are many phenomenological potentials using different techniques to describe the spectroscopy of the quarkonium systems like charmonium, bottomonium, Bc meson systems. In the present work, we choose a phenomenological potential (linear, Yukawa, and harmonic potentials) in the framework of the nonrelativistic Schrodinger equation with relativistic corrections using the Nikiforov-Uvarov (NU) method. We obtained the eigenfunction and eigenvalue comparing the results with the available experimental data. The results are in good agreement with the available experimental data. |
1211.4008 | Maxim Perelstein | Yoonseok John Chae and Maxim Perelstein | Dark Matter Search at a Linear Collider: Effective Operator Approach | 15 pages, 5 figures | null | 10.1007/JHEP05(2013)138 | null | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Experiments at electron-positron colliders can search for dark matter
particle pair-production in association with a photon. We estimate the
sensitivity of this search at the proposed International Linear Collider (ILC),
under a variety of run scenarios. We employ the effective operator formalism to
provide a quasi-model-independent theoretical description of the signal, and
present the reach of the ILC in terms of the scale \Lambda suppressing the dark
matter-electron coupling operator. We find that at the 250 GeV center-of-mass
energy, the ILC can probe \Lambda up to 1-1.2 TeV, a factor of 2.5-3 above the
best current bounds from LEP-2. With 1 TeV energy and polarized beams, the
reach can be extended to 3-4 TeV. The ILC can discover this signature even if
annihilation to electrons provides only a small fraction of the total dark
matter annihilation rate in the early universe. We also argue that large
regions of parameter space allowed by current LHC and direct detection bounds
will be accessible at the ILC.
| [
{
"created": "Fri, 16 Nov 2012 20:14:45 GMT",
"version": "v1"
}
] | 2015-06-12 | [
[
"Chae",
"Yoonseok John",
""
],
[
"Perelstein",
"Maxim",
""
]
] | Experiments at electron-positron colliders can search for dark matter particle pair-production in association with a photon. We estimate the sensitivity of this search at the proposed International Linear Collider (ILC), under a variety of run scenarios. We employ the effective operator formalism to provide a quasi-model-independent theoretical description of the signal, and present the reach of the ILC in terms of the scale \Lambda suppressing the dark matter-electron coupling operator. We find that at the 250 GeV center-of-mass energy, the ILC can probe \Lambda up to 1-1.2 TeV, a factor of 2.5-3 above the best current bounds from LEP-2. With 1 TeV energy and polarized beams, the reach can be extended to 3-4 TeV. The ILC can discover this signature even if annihilation to electrons provides only a small fraction of the total dark matter annihilation rate in the early universe. We also argue that large regions of parameter space allowed by current LHC and direct detection bounds will be accessible at the ILC. |
hep-ph/0206288 | Carsten Vogt | M. Diehl, P. Kroll and C. Vogt | Two-Photon Annihilation into Baryon-Antibaryon Pairs | 20 pages latex, 4 figures. v2: minor clarifications, references
updated | Eur.Phys.J.C26:567-577,2003 | 10.1140/epjc/s2002-01075-4 | WU B 02-06, NORDITA-2002-15 HE | hep-ph | null | We study the handbag contribution to two-photon annihilation into
baryon-antibaryon pairs at large energy and momentum transfer. We derive
factorization of the process amplitude into a hard gamma gamma -> q qbar
subprocess and form factors describing the soft q qbar -> B Bbar transition,
assuming that the process is dominated by configurations where the (anti)quark
approximately carries the full momentum of the (anti)baryon. The form factors
represent moments of time-like generalized parton distributions, so-called B
Bbar distribution amplitudes. A characteristic feature of the handbag mechanism
is the absence of isospin-two components in the final state, which in
combination with flavor symmetry provides relations among the form factors for
the members of the lowest-lying baryon octet. Assuming dominance of the handbag
contribution, we can describe current experimental data with form factors of
plausible size, and predict the cross sections of presently unmeasured B Bbar
channels.
| [
{
"created": "Thu, 27 Jun 2002 16:54:10 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Oct 2002 14:16:24 GMT",
"version": "v2"
}
] | 2011-09-13 | [
[
"Diehl",
"M.",
""
],
[
"Kroll",
"P.",
""
],
[
"Vogt",
"C.",
""
]
] | We study the handbag contribution to two-photon annihilation into baryon-antibaryon pairs at large energy and momentum transfer. We derive factorization of the process amplitude into a hard gamma gamma -> q qbar subprocess and form factors describing the soft q qbar -> B Bbar transition, assuming that the process is dominated by configurations where the (anti)quark approximately carries the full momentum of the (anti)baryon. The form factors represent moments of time-like generalized parton distributions, so-called B Bbar distribution amplitudes. A characteristic feature of the handbag mechanism is the absence of isospin-two components in the final state, which in combination with flavor symmetry provides relations among the form factors for the members of the lowest-lying baryon octet. Assuming dominance of the handbag contribution, we can describe current experimental data with form factors of plausible size, and predict the cross sections of presently unmeasured B Bbar channels. |
hep-ph/0205069 | Michael Klasen | S. Albino, M. Klasen (Hamburg), S. Soldner-Rembold (Fermilab) | Strong Coupling Constant from the Photon Structure Function | 11 pages, 2 tables, 2 figures. Version accepted for publication by
Phys. Rev. Lett | Phys.Rev.Lett. 89 (2002) 122004 | 10.1103/PhysRevLett.89.122004 | DESY 02-052, FERMILAB-Pub-02/071-E | hep-ph hep-ex | null | We extract the value of the strong coupling constant alpha_s from a
single-parameter pointlike fit to the photon structure function F_2^gamma at
large x and Q^2 and from a first five-parameter full (pointlike and hadronic)
fit to the complete F_2^gamma data set taken at PETRA, TRISTAN, and LEP. In
next-to-leading order and the MSbar renormalization and factorization schemes,
we obtain alpha_s(m_Z)=0.1183 +/- 0.0050(exp.)^+0.0029_-0.0028(theor.)
[pointlike] and alpha_s(m_Z)=0.1198 +/- 0.0028(exp.)^+0.0034_-0.0046(theor.)
[pointlike and hadronic]. We demonstrate that the data taken at LEP have
reduced the experimental error by about a factor of two, so that a competitive
determination of alpha_s from F_2^gamma is now possible.
| [
{
"created": "Wed, 8 May 2002 06:26:25 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Jul 2002 06:38:28 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Albino",
"S.",
"",
"Hamburg"
],
[
"Klasen",
"M.",
"",
"Hamburg"
],
[
"Soldner-Rembold",
"S.",
"",
"Fermilab"
]
] | We extract the value of the strong coupling constant alpha_s from a single-parameter pointlike fit to the photon structure function F_2^gamma at large x and Q^2 and from a first five-parameter full (pointlike and hadronic) fit to the complete F_2^gamma data set taken at PETRA, TRISTAN, and LEP. In next-to-leading order and the MSbar renormalization and factorization schemes, we obtain alpha_s(m_Z)=0.1183 +/- 0.0050(exp.)^+0.0029_-0.0028(theor.) [pointlike] and alpha_s(m_Z)=0.1198 +/- 0.0028(exp.)^+0.0034_-0.0046(theor.) [pointlike and hadronic]. We demonstrate that the data taken at LEP have reduced the experimental error by about a factor of two, so that a competitive determination of alpha_s from F_2^gamma is now possible. |
1205.1996 | Kamakshya Modak | Kamakshya Prasad Modak, Debasish Majumdar | Gamma Ray and Neutrino Flux from Annihilation of Neutralino Dark Matter
at Galactic Halo Region in mAMSB Model | 34 pages LaTeX, 36 postscript figures; Text and figures modified, new
figures added; version published in J. Phys. G | J. Phys. G: Nucl. Part. Phys. 40 (2013) 075201 | 10.1088/0954-3899/40/7/075201 | SINP-APC-12/3 | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the lightest supersymmetric particle (LSP), neutralino in minimal
anomaly mediated supersymmetry breaking model (mAMSB) to be a possible
candidate for weakly interacting massive particles (WIMP) or cold dark matter
and investigate its direct and indirect detections. The theoretically allowed
supersymmetric parametric space for such a model along with the recent bounds
from LHC is constrained by the WMAP results for relic densities. The spin
independent and spin dependent scattering cross sections for dark matter off
nucleon are thus constrained from the WMAP results. They are found to be within
the allowed regions of different ongoing direct detection experiments. The
annihilation of such dark matter candidates at the galactic centre produce
different standard model particles such as gamma rays, neutrinos etc. In this
work, we calculate the possible fluxes of these $\gamma$-rays and neutrinos
coming from the direction of the galactic centre (and its neighbourhood) at
terrestrial or satellite borne detectors. The calcutated $\gamma$-ray flux is
compared with the observational results of HESS experiment. The neutrino flux
of different flavours from the galactic centre and at different locations away
from the galactic centre produced by WIMP annihilation in this model are also
obtained for four types of galactic dark matter halo profiles. The detection
prospects of such $\nu_\mu$ coming from the direction of the galactic centre at
the ANTARES under sea detector are discussed in terms of muon signal yield from
these muon neutrinos. Both the gamma and neutrino signals are estimated for
four different dark matter halo profiles.
| [
{
"created": "Wed, 9 May 2012 14:32:42 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Jun 2013 13:32:59 GMT",
"version": "v2"
}
] | 2013-06-28 | [
[
"Modak",
"Kamakshya Prasad",
""
],
[
"Majumdar",
"Debasish",
""
]
] | We consider the lightest supersymmetric particle (LSP), neutralino in minimal anomaly mediated supersymmetry breaking model (mAMSB) to be a possible candidate for weakly interacting massive particles (WIMP) or cold dark matter and investigate its direct and indirect detections. The theoretically allowed supersymmetric parametric space for such a model along with the recent bounds from LHC is constrained by the WMAP results for relic densities. The spin independent and spin dependent scattering cross sections for dark matter off nucleon are thus constrained from the WMAP results. They are found to be within the allowed regions of different ongoing direct detection experiments. The annihilation of such dark matter candidates at the galactic centre produce different standard model particles such as gamma rays, neutrinos etc. In this work, we calculate the possible fluxes of these $\gamma$-rays and neutrinos coming from the direction of the galactic centre (and its neighbourhood) at terrestrial or satellite borne detectors. The calcutated $\gamma$-ray flux is compared with the observational results of HESS experiment. The neutrino flux of different flavours from the galactic centre and at different locations away from the galactic centre produced by WIMP annihilation in this model are also obtained for four types of galactic dark matter halo profiles. The detection prospects of such $\nu_\mu$ coming from the direction of the galactic centre at the ANTARES under sea detector are discussed in terms of muon signal yield from these muon neutrinos. Both the gamma and neutrino signals are estimated for four different dark matter halo profiles. |
hep-ph/9903233 | Peter Lichard | Peter Lichard (Department of Physics and Astronomy, University of
Pittsburgh, USA and Institute of Physics, Silesian University, Czech
Republic) | Relations between the K_{l3} and tau --> K pi nu_tau decays | 14 pages, RevTeX, epsf.sty, 3 embedded figures | Phys.Rev. D60 (1999) 093012 | 10.1103/PhysRevD.60.093012 | null | hep-ph | null | We investigate the relations between the K_{l3} and tau --> K pi nu_tau
decays using the meson dominance approach. First, the experimental branching
fractions (BF) for K^-_{e3} and K^0_{e3} are used to fix two normalization
constants (isospin invariance is not assumed). Then, the BF of tau^- -->
K^*(892)^- nu_tau is calculated in agreement with experiment. We further argue
that the nonzero value of the slope parameter lambda_0 of the K^-_{mu3} and
K^0_{mu3} form factors f_0(t) implies the existence of the tau^- -->
K_0^*(1430)^- nu_tau decay. We calculate its BF, together with BF's of the
K^-_{mu3}, K^0_{mu3}, tau- --> K^- pi^0 nu_tau, and tau- --> antiK^0 pi^0
nu_tau decays, as a function of the lambda_0 parameter. At some value of
lambda_0, different for charged and neutral kaons, calculated BF's seem to
match existing data and a prediction is obtained for the tau^- --> K pi nu
decays going through the K_0^*(1430)^- resonance.
| [
{
"created": "Tue, 2 Mar 1999 19:19:55 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Lichard",
"Peter",
"",
"Department of Physics and Astronomy, University of\n Pittsburgh, USA and Institute of Physics, Silesian University, Czech\n Republic"
]
] | We investigate the relations between the K_{l3} and tau --> K pi nu_tau decays using the meson dominance approach. First, the experimental branching fractions (BF) for K^-_{e3} and K^0_{e3} are used to fix two normalization constants (isospin invariance is not assumed). Then, the BF of tau^- --> K^*(892)^- nu_tau is calculated in agreement with experiment. We further argue that the nonzero value of the slope parameter lambda_0 of the K^-_{mu3} and K^0_{mu3} form factors f_0(t) implies the existence of the tau^- --> K_0^*(1430)^- nu_tau decay. We calculate its BF, together with BF's of the K^-_{mu3}, K^0_{mu3}, tau- --> K^- pi^0 nu_tau, and tau- --> antiK^0 pi^0 nu_tau decays, as a function of the lambda_0 parameter. At some value of lambda_0, different for charged and neutral kaons, calculated BF's seem to match existing data and a prediction is obtained for the tau^- --> K pi nu decays going through the K_0^*(1430)^- resonance. |
0706.3438 | Antoni Szczurek | A. Szczurek, A. Rybarska, G. Slipek | Dijet correlations in $pp$ collisions at RHIC | 11 pages, 23 figures, a talk presented at International Workshop on
High-pT physics at LHC, Jyvaskyla, Finland, March 23-27 2007 | null | null | null | hep-ph | null | We compare results of $k_t$-factorization approach and next-to-leading order
collinear-factorization approach for dijet correlations in proton-proton
collisions at RHIC energies. We discuss correlations in azimuthal angle as well
as correlations in two-dimensional space of transverse momenta of two jets.
Some $k_t$-factorization subprocesses are included for the first time in the
literature. Different unintegrated gluon/parton distributions are used in the
$k_t$-factorization approach. The results depend on UGDF/UPDF used. Limitations
due to leading jet condition are discussed.
| [
{
"created": "Sat, 23 Jun 2007 09:44:36 GMT",
"version": "v1"
}
] | 2009-04-16 | [
[
"Szczurek",
"A.",
""
],
[
"Rybarska",
"A.",
""
],
[
"Slipek",
"G.",
""
]
] | We compare results of $k_t$-factorization approach and next-to-leading order collinear-factorization approach for dijet correlations in proton-proton collisions at RHIC energies. We discuss correlations in azimuthal angle as well as correlations in two-dimensional space of transverse momenta of two jets. Some $k_t$-factorization subprocesses are included for the first time in the literature. Different unintegrated gluon/parton distributions are used in the $k_t$-factorization approach. The results depend on UGDF/UPDF used. Limitations due to leading jet condition are discussed. |
1410.3276 | Mainak Chakraborty | Mainak Chakraborty, H. Zeen Devi, Ambar Ghosal | Scaling ansatz with texture zeros in linear seesaw | 18 pages, 10 tables, 1 figure, Accepted for publication in Physics
Letters B | null | 10.1016/j.physletb.2014.12.038 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate scaling ansatz with texture zeros within the framework of
linear seesaw mechanism. In this variant of seesaw mechanism a simplified
expression of effective neutrino mass matrix $m_\nu$ containing two Dirac type
matrices ($m_D$ and $m_{DS}$) and one Majorana type matrix ($m_{RS}$) is
obtained by virtue of neglecting the global $U(1)_L$ symmetry breaking term in
the mass term of the Lagrangian. Along with the charged lepton mass matrix, the
matrix $m_{RS}$ too, is chosen in a diagonal basis whereas a scaling relation
is incorporated in $m_D$ and $m_{DS}$ with different scale factors. Our goal in
this work is to achieve a completely phenomenologically acceptable $m_\nu$
generated by combinations of $m_D$ and $m_{DS}$ containing least number of
independent parameters or maximum number of zeros. At the end of the numerical
analysis it is found that number of zeros in any of the constituent Dirac type
matrices ($m_D$ and $m_{DS}$) of $m_\nu$ cannot be greater than six in order to
meet the phenomenological requirements. The hierarchy obtained here is normal
and also the values of the two parameters sum mass ($\sum m_i$) and
$|m_{\nu_{ee}}|$ are below the present experimental lower limit.
| [
{
"created": "Mon, 13 Oct 2014 12:19:13 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Jan 2015 08:16:12 GMT",
"version": "v2"
}
] | 2018-05-09 | [
[
"Chakraborty",
"Mainak",
""
],
[
"Devi",
"H. Zeen",
""
],
[
"Ghosal",
"Ambar",
""
]
] | We investigate scaling ansatz with texture zeros within the framework of linear seesaw mechanism. In this variant of seesaw mechanism a simplified expression of effective neutrino mass matrix $m_\nu$ containing two Dirac type matrices ($m_D$ and $m_{DS}$) and one Majorana type matrix ($m_{RS}$) is obtained by virtue of neglecting the global $U(1)_L$ symmetry breaking term in the mass term of the Lagrangian. Along with the charged lepton mass matrix, the matrix $m_{RS}$ too, is chosen in a diagonal basis whereas a scaling relation is incorporated in $m_D$ and $m_{DS}$ with different scale factors. Our goal in this work is to achieve a completely phenomenologically acceptable $m_\nu$ generated by combinations of $m_D$ and $m_{DS}$ containing least number of independent parameters or maximum number of zeros. At the end of the numerical analysis it is found that number of zeros in any of the constituent Dirac type matrices ($m_D$ and $m_{DS}$) of $m_\nu$ cannot be greater than six in order to meet the phenomenological requirements. The hierarchy obtained here is normal and also the values of the two parameters sum mass ($\sum m_i$) and $|m_{\nu_{ee}}|$ are below the present experimental lower limit. |
2107.13882 | Zhou Rui | Meng-Kun Jia, Chao-Qi Zhang, Jia-Ming Li, and Zhou Rui | $S$-wave contributions to the $B_{(s)}\rightarrow \chi_{c1}
(\pi\pi,K\pi,KK)$ decays | 17 pages, 5 figures | Phys. Rev. D 104, 073001 (2021) | 10.1103/PhysRevD.104.073001 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We make a detailed study of the three-body decays $B_{(s)}\rightarrow
\chi_{c1} hh'$, where $h^{(')}$ is either a pion or kaon, by taking into
account the $S$-wave states in the $hh'$ invariant mass distribution within the
perturbative QCD approach. The two meson distribution amplitudes (DAs) are
introduced to capture the strong interaction related to the production of the
$hh'$ system. We calculate the branching ratios for the $S$-wave components and
observe large values of order $10^{-4}$ for some Cabibbo-favored decays, which
are accessible to the LHCb and Belle II experiments. The obtained branching
ratio $\mathcal{B}(B\rightarrow \chi_{c1}K^*_{0}(1430)(\rightarrow
K^+\pi^-))=(5.1^{+0.6}_{-0.8})\times 10^{-5}$ consistent with the data from
Belle within errors. Moreover, we also predict the differential distributions
in the $hh'$ invariant mass for the decays under consideration, which await the
future experimental test. In addition, the corresponding $\chi_{c1}(2P)$
channels are also investigated, which are helpful to clarify the nature of the
$X(3872)$ state.
| [
{
"created": "Thu, 29 Jul 2021 10:34:30 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Oct 2021 00:39:38 GMT",
"version": "v2"
}
] | 2021-10-13 | [
[
"Jia",
"Meng-Kun",
""
],
[
"Zhang",
"Chao-Qi",
""
],
[
"Li",
"Jia-Ming",
""
],
[
"Rui",
"Zhou",
""
]
] | We make a detailed study of the three-body decays $B_{(s)}\rightarrow \chi_{c1} hh'$, where $h^{(')}$ is either a pion or kaon, by taking into account the $S$-wave states in the $hh'$ invariant mass distribution within the perturbative QCD approach. The two meson distribution amplitudes (DAs) are introduced to capture the strong interaction related to the production of the $hh'$ system. We calculate the branching ratios for the $S$-wave components and observe large values of order $10^{-4}$ for some Cabibbo-favored decays, which are accessible to the LHCb and Belle II experiments. The obtained branching ratio $\mathcal{B}(B\rightarrow \chi_{c1}K^*_{0}(1430)(\rightarrow K^+\pi^-))=(5.1^{+0.6}_{-0.8})\times 10^{-5}$ consistent with the data from Belle within errors. Moreover, we also predict the differential distributions in the $hh'$ invariant mass for the decays under consideration, which await the future experimental test. In addition, the corresponding $\chi_{c1}(2P)$ channels are also investigated, which are helpful to clarify the nature of the $X(3872)$ state. |
hep-ph/0503207 | Stefan Scherer | I. Giller, A. Ocherashvili, T. Ebertshauser, M. A. Moinester, S.
Scherer | A new determination of the $\gamma \pi \to \pi\pi$ anomalous amplitude
via $\pi^- e^- \to \pi^- e^- \pi^{0}$ data | 23 pages, 14 figures, discussion of the ChPT calculation extended | Eur.Phys.J. A25 (2005) 229-240 | 10.1140/epja/i2005-10116-1 | MKPH-T-05-02 | hep-ph hep-ex nucl-th | null | We discuss the reaction $\pi^- e^- \to \pi^- e^- \pi^{0}$ with the purpose of
obtaining information on the $\gamma \pi \to \pi\pi$ anomalous amplitude ${\cal
F}_{3\pi}$. We compare a full calculation at ${\cal O}(p^6)$ in chiral
perturbation theory and various phenomenological predictions with the existing
data of Amendolia {\em et al}. By integrating our theory results using Monte
Carlo techniques we obtain $\sigma= 2.05 $ nb at ${\cal O}(p^6)$ and $\sigma=
2.17 $ nb after including the dominant electromagnetic correction. Both results
are in good agreement with the experimental cross section of $\sigma= (2.11 \pm
0.47)$ nb. On the basis of the ChPT results one would extract from the the
experimental cross section as amplitudes ${\cal F}_{3\pi}^{(0)\rm extr} = (9.9
\pm 1.1)$ GeV$^{-3}$ and ${\cal F}_{3\pi}^{(0)\rm extr} = (9.6 \pm 1.1)$
GeV$^{-3}$, respectively, which have to be compared with the low-energy theorem
${\cal F}_{3\pi}=e/(4\pi^2 F_\pi^3)=9.72 {GeV}^{-3}$. We emphasize the need for
new data to allow for a comparison of experimental and theoretical
distributions and to obtain ${\cal F}_{3\pi}$ with smaller uncertainty.
| [
{
"created": "Mon, 21 Mar 2005 17:16:48 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Jun 2005 11:01:55 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Giller",
"I.",
""
],
[
"Ocherashvili",
"A.",
""
],
[
"Ebertshauser",
"T.",
""
],
[
"Moinester",
"M. A.",
""
],
[
"Scherer",
"S.",
""
]
] | We discuss the reaction $\pi^- e^- \to \pi^- e^- \pi^{0}$ with the purpose of obtaining information on the $\gamma \pi \to \pi\pi$ anomalous amplitude ${\cal F}_{3\pi}$. We compare a full calculation at ${\cal O}(p^6)$ in chiral perturbation theory and various phenomenological predictions with the existing data of Amendolia {\em et al}. By integrating our theory results using Monte Carlo techniques we obtain $\sigma= 2.05 $ nb at ${\cal O}(p^6)$ and $\sigma= 2.17 $ nb after including the dominant electromagnetic correction. Both results are in good agreement with the experimental cross section of $\sigma= (2.11 \pm 0.47)$ nb. On the basis of the ChPT results one would extract from the the experimental cross section as amplitudes ${\cal F}_{3\pi}^{(0)\rm extr} = (9.9 \pm 1.1)$ GeV$^{-3}$ and ${\cal F}_{3\pi}^{(0)\rm extr} = (9.6 \pm 1.1)$ GeV$^{-3}$, respectively, which have to be compared with the low-energy theorem ${\cal F}_{3\pi}=e/(4\pi^2 F_\pi^3)=9.72 {GeV}^{-3}$. We emphasize the need for new data to allow for a comparison of experimental and theoretical distributions and to obtain ${\cal F}_{3\pi}$ with smaller uncertainty. |
hep-ph/9902335 | Vladimir Shevchenko | N.O.Agasian, B.O.Kerbikov, V.I.Shevchenko | Nonperturbative QCD vacuum and Colour Superconductivity | LaTeX, 12 pages, reference added | Phys.Rept. 320 (1999) 131-138 | 10.1016/S0370-1573(99)00080-0 | ITEP-TH-14-99 | hep-ph | null | We discuss the possibility of existence of colour superconducting state in
real QCD vacuum with nonzero gluon condensate. We argue, that nonperturbative
gluonic fields might play a crucial role in colour superconductivity scenario.
| [
{
"created": "Fri, 12 Feb 1999 17:20:21 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Mar 1999 16:14:32 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Agasian",
"N. O.",
""
],
[
"Kerbikov",
"B. O.",
""
],
[
"Shevchenko",
"V. I.",
""
]
] | We discuss the possibility of existence of colour superconducting state in real QCD vacuum with nonzero gluon condensate. We argue, that nonperturbative gluonic fields might play a crucial role in colour superconductivity scenario. |
1803.00677 | Sujay Shil | Pankaj Agrawal, Manimala Mitra, Saurabh Niyogi, Sujay Shil and Michael
Spannowsky | Probing the Type-II Seesaw Mechanism through the Production of Higgs
Bosons at a Lepton Collider | 20 pages, 8 figures and 5 tables | Phys. Rev. D 98, 015024 (2018) | 10.1103/PhysRevD.98.015024 | IP/BBSR/2018-18, IPPP/18/14 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the production and decays of doubly-charged Higgs bosons for
the Type-II seesaw mechanism at an $e^{+} e^{-}$ collider with two center of
mass energies, $\sqrt{s}=380$ GeV and 3 TeV, and analyze the fully hadronic
final states in detail. Lower mass ranges can be probed during the 380 GeV run
of the collider, while high mass ranges, which are beyond the 13 TeV Large
Hadron Collider discovery reach, can be probed with $\sqrt{s}=3$ TeV. For such
a heavy Higgs boson, the final decay products are collimated, resulting in
fat-jets. We perform a substructure analysis to reduce the background and find
that a doubly-charged Higgs boson in the mass range 800-1120 GeV can be
discovered during the 3 TeV run, with integrated luminosity $\mathcal{L} \sim
95\, \rm{fb}^{-1}$ of data. For 380 GeV center of mass energy, we find that for
the doubly-charged Higgs boson in the range 160-172 GeV, a $5\sigma$
significance can be achieved with only integrated luminosity $\mathcal{L} \sim
24 \, \rm{fb}^{-1}$. Therefore, a light Higgs boson can be discovered
immediately during the run of a future $e^{+} e^{-}$ collider.
| [
{
"created": "Fri, 2 Mar 2018 01:12:01 GMT",
"version": "v1"
}
] | 2018-07-25 | [
[
"Agrawal",
"Pankaj",
""
],
[
"Mitra",
"Manimala",
""
],
[
"Niyogi",
"Saurabh",
""
],
[
"Shil",
"Sujay",
""
],
[
"Spannowsky",
"Michael",
""
]
] | We investigate the production and decays of doubly-charged Higgs bosons for the Type-II seesaw mechanism at an $e^{+} e^{-}$ collider with two center of mass energies, $\sqrt{s}=380$ GeV and 3 TeV, and analyze the fully hadronic final states in detail. Lower mass ranges can be probed during the 380 GeV run of the collider, while high mass ranges, which are beyond the 13 TeV Large Hadron Collider discovery reach, can be probed with $\sqrt{s}=3$ TeV. For such a heavy Higgs boson, the final decay products are collimated, resulting in fat-jets. We perform a substructure analysis to reduce the background and find that a doubly-charged Higgs boson in the mass range 800-1120 GeV can be discovered during the 3 TeV run, with integrated luminosity $\mathcal{L} \sim 95\, \rm{fb}^{-1}$ of data. For 380 GeV center of mass energy, we find that for the doubly-charged Higgs boson in the range 160-172 GeV, a $5\sigma$ significance can be achieved with only integrated luminosity $\mathcal{L} \sim 24 \, \rm{fb}^{-1}$. Therefore, a light Higgs boson can be discovered immediately during the run of a future $e^{+} e^{-}$ collider. |
hep-ph/9908279 | G. S. Krishnaswami | G. S. Krishnaswami and S. G. Rajeev (University of Rochester) | The x-dependence of Parton Distributions Compared with Neutrino Data | 5 pages, RevTex | null | null | null | hep-ph | null | We use the variational principle of Quantum HadronDynamics, an alternative
formulation of Quantum ChromoDynamics, to determine the wavefunction of valence
quarks in a baryon at a low value of Q^2. This can be used to predict the
structure function xF_3(x,Q^2) at higher values of Q^2 using the evolution
equations of perturbative QCD. This prediction is compared to the measurements
of neutrino scattering cross-section by the CDHS and CCFR experiments. The
agreement is quite good, confirming the validity of QHD as a way of studying
hadronic structure.
| [
{
"created": "Fri, 6 Aug 1999 03:33:08 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Krishnaswami",
"G. S.",
"",
"University of Rochester"
],
[
"Rajeev",
"S. G.",
"",
"University of Rochester"
]
] | We use the variational principle of Quantum HadronDynamics, an alternative formulation of Quantum ChromoDynamics, to determine the wavefunction of valence quarks in a baryon at a low value of Q^2. This can be used to predict the structure function xF_3(x,Q^2) at higher values of Q^2 using the evolution equations of perturbative QCD. This prediction is compared to the measurements of neutrino scattering cross-section by the CDHS and CCFR experiments. The agreement is quite good, confirming the validity of QHD as a way of studying hadronic structure. |
hep-ph/9909427 | Spencer Klein | V. Emel'yanov, A. Khodinov, S.R. Klein and R. Vogt | The Effect of Shadowing on Initial Conditions, Transverse Energy and
Hard Probes in Ultrarelativistic Heavy Ion Collisions | Submitted to Phys. Rev. C | Phys.Rev.C61:044904,2000 | 10.1103/PhysRevC.61.044904 | LBNL-42900 | hep-ph nucl-th | null | The effect of shadowing on the early state of ultrarelativistic heavy ion
collisions is investigated along with transverse energy and hard process
production, specifically Drell-Yan, $J/\psi$, and $\Upsilon$ production. We
choose several parton distributions and parameterizations of nuclear shadowing,
as well as the spatial dependence of shadowing, to study the influence of
shadowing on relevant observables. Results are presented for Au+Au collisions
at $\sqrt{s_{NN}} = 200$ GeV and Pb+Pb collisions at $\sqrt{s_{NN}} = 5.5$ TeV.
| [
{
"created": "Fri, 17 Sep 1999 23:12:51 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Emel'yanov",
"V.",
""
],
[
"Khodinov",
"A.",
""
],
[
"Klein",
"S. R.",
""
],
[
"Vogt",
"R.",
""
]
] | The effect of shadowing on the early state of ultrarelativistic heavy ion collisions is investigated along with transverse energy and hard process production, specifically Drell-Yan, $J/\psi$, and $\Upsilon$ production. We choose several parton distributions and parameterizations of nuclear shadowing, as well as the spatial dependence of shadowing, to study the influence of shadowing on relevant observables. Results are presented for Au+Au collisions at $\sqrt{s_{NN}} = 200$ GeV and Pb+Pb collisions at $\sqrt{s_{NN}} = 5.5$ TeV. |
hep-ph/0002019 | Shin Muroya | N. Sasaki, O. Miyamura, S. Muroya and C. Nonaka | Baryon Diffusion Constant in Hot and Dense Hadronic Matter Based on an
Event Generator Urasima | 5 pages, 2 fugures, to appear in the proceedings of the 28th
International Workshop on Gross Properties of Nuclei and Nuclear Excitation:
Hadrons in Dense Matter (HIRSCHEGG 2000) | null | null | TWC-00-3 | hep-ph | null | We generate the statistical ensembles in equilibrium with fixed temperature
and chemical potential by imposing periodic boundary condition to the
simulation of URASiMA(Ultra-Relativistic AA collision Simulator based on
Multiple Scattering Algorithm). By using the generated ensembles, we
investigate the temperature dependence and the chemical potential dependence of
the nucleon diffusion constant of a dense and hot hadronic matter.
| [
{
"created": "Wed, 2 Feb 2000 08:54:24 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Feb 2000 05:35:26 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Sasaki",
"N.",
""
],
[
"Miyamura",
"O.",
""
],
[
"Muroya",
"S.",
""
],
[
"Nonaka",
"C.",
""
]
] | We generate the statistical ensembles in equilibrium with fixed temperature and chemical potential by imposing periodic boundary condition to the simulation of URASiMA(Ultra-Relativistic AA collision Simulator based on Multiple Scattering Algorithm). By using the generated ensembles, we investigate the temperature dependence and the chemical potential dependence of the nucleon diffusion constant of a dense and hot hadronic matter. |
hep-ph/0103122 | Anindya Datta | Debrupa Chakraverty, Anindya Datta, Biswarup Mukhopadhyaya | Heavy quark production via supersymmetric interaction at a neutrino
factory | Few typos are corrected in this version | Phys.Lett.B508:74-78,2001; Erratum-ibid.B519:285,2001 | 10.1016/S0370-2693(01)00483-X | MRI-P-010301 | hep-ph | null | We investigate b-quark production in both charged and neutral current
channels through neutrino-nucleon scattering at a neutrino factory, mediated by
the lepton flavour violating interactions present in a supersymmetric theory
with broken R-parity. Using values of the effctive interaction strengths well
below the current and projected experimental bounds, we are still able to
predict markedly enhanced event rates, especially for the neutral current
events which are not allowed at the lowest order in the standard model (SM).
Data from neutrino factories can therefore be used to probe strengths of such
interactions to considerably higher precision than what can be envisioned in
other experiments.
| [
{
"created": "Mon, 12 Mar 2001 16:43:35 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Apr 2001 18:04:18 GMT",
"version": "v2"
},
{
"created": "Mon, 18 Jun 2001 09:00:56 GMT",
"version": "v3"
}
] | 2011-07-19 | [
[
"Chakraverty",
"Debrupa",
""
],
[
"Datta",
"Anindya",
""
],
[
"Mukhopadhyaya",
"Biswarup",
""
]
] | We investigate b-quark production in both charged and neutral current channels through neutrino-nucleon scattering at a neutrino factory, mediated by the lepton flavour violating interactions present in a supersymmetric theory with broken R-parity. Using values of the effctive interaction strengths well below the current and projected experimental bounds, we are still able to predict markedly enhanced event rates, especially for the neutral current events which are not allowed at the lowest order in the standard model (SM). Data from neutrino factories can therefore be used to probe strengths of such interactions to considerably higher precision than what can be envisioned in other experiments. |
2001.08762 | Avik Banerjee | Avik Banerjee, Gautam Bhattacharyya, Palash B. Pal | SO(10) unification with horizontal symmetry | 21 pages, 6 tables. v2: Further clarifications added primarily in
Discussions Section, References updated, to be published in PRD | Phys. Rev. D 102, 015018 (2020) | 10.1103/PhysRevD.102.015018 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extend the nonsupersymmetric SO(10) grand unification theories by adding a
horizontal symmetry, which connects the three generations of fermions. Without
committing to any specific symmetry group, we investigate the 1-loop
renormalization group evolutions of the gauge couplings with one and two
intermediate breaking scales. We find that depending on the SO(10) breaking
chains, gauge coupling unification is compatible with only a handful of choices
of representations of the Higgs bosons under the horizontal symmetry.
| [
{
"created": "Thu, 23 Jan 2020 19:02:15 GMT",
"version": "v1"
},
{
"created": "Sun, 12 Jul 2020 17:28:03 GMT",
"version": "v2"
}
] | 2020-07-23 | [
[
"Banerjee",
"Avik",
""
],
[
"Bhattacharyya",
"Gautam",
""
],
[
"Pal",
"Palash B.",
""
]
] | We extend the nonsupersymmetric SO(10) grand unification theories by adding a horizontal symmetry, which connects the three generations of fermions. Without committing to any specific symmetry group, we investigate the 1-loop renormalization group evolutions of the gauge couplings with one and two intermediate breaking scales. We find that depending on the SO(10) breaking chains, gauge coupling unification is compatible with only a handful of choices of representations of the Higgs bosons under the horizontal symmetry. |
0901.1020 | Jong-Phil Lee | Jong-Phil Lee | Deconstructing unparticles in higher dimensions | 9 pages. Minor changes, references added | Phys.Rev.D79:076002,2009 | 10.1103/PhysRevD.79.076002 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Unparticles are realized by deconstruction in higher extra dimensions. It is
shown that in this framework when the scale invariance is broken, the
corresponding spectral function of the unparticle is shifted by an amount of
the breaking scale. The result strongly supports the conventional ansatz for
the spectral function of the unparticle in the literature.
| [
{
"created": "Thu, 8 Jan 2009 11:23:57 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Feb 2009 08:48:40 GMT",
"version": "v2"
}
] | 2010-04-21 | [
[
"Lee",
"Jong-Phil",
""
]
] | Unparticles are realized by deconstruction in higher extra dimensions. It is shown that in this framework when the scale invariance is broken, the corresponding spectral function of the unparticle is shifted by an amount of the breaking scale. The result strongly supports the conventional ansatz for the spectral function of the unparticle in the literature. |
1210.4801 | Rathin Adhikari | Arnab Dasgupta, Zini Rahman, Rathin Adhikari | Discovery reach of $CP$ violation and non-standard interactions in low
energy neutrino factory | 16 pages, 8 figures (39 pdf files), text, figures modified | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In low energy neutrino factory ($E_{\mu}< 10$GeV) using MIND detector, we
have studied the optimization of $CP$ violation discovery reach in the leptonic
sector for different baselines and different parent muon energy considering
only Standard Model interactions of neutrinos with matter. Considering such
optimized experimental set-up of baseline and energy we have addressed the
question of how $CP$ violation discovery reach could get affected by the
presence of non-standard interactions of neutrinos with matter during the
propagation of neutrinos. For off diagonal NSI elements there could be complex
phases $\phi_{ij}$ which could also lead to $CP$ violation. In presence of
these complex phases we have shown the contours showing the discovery reach of
$\delta$ and $\phi_{ij}$. We have also shown the discovery reach of NSIs in the
same experimental set-up which is optimized for discovery of $CP$ violation in
the leptonic sector.
| [
{
"created": "Wed, 17 Oct 2012 17:43:55 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Jan 2013 11:59:18 GMT",
"version": "v2"
},
{
"created": "Tue, 15 Apr 2014 13:59:38 GMT",
"version": "v3"
},
{
"created": "Mon, 21 Apr 2014 12:55:30 GMT",
"version": "v4"
}
] | 2014-04-22 | [
[
"Dasgupta",
"Arnab",
""
],
[
"Rahman",
"Zini",
""
],
[
"Adhikari",
"Rathin",
""
]
] | In low energy neutrino factory ($E_{\mu}< 10$GeV) using MIND detector, we have studied the optimization of $CP$ violation discovery reach in the leptonic sector for different baselines and different parent muon energy considering only Standard Model interactions of neutrinos with matter. Considering such optimized experimental set-up of baseline and energy we have addressed the question of how $CP$ violation discovery reach could get affected by the presence of non-standard interactions of neutrinos with matter during the propagation of neutrinos. For off diagonal NSI elements there could be complex phases $\phi_{ij}$ which could also lead to $CP$ violation. In presence of these complex phases we have shown the contours showing the discovery reach of $\delta$ and $\phi_{ij}$. We have also shown the discovery reach of NSIs in the same experimental set-up which is optimized for discovery of $CP$ violation in the leptonic sector. |
2102.09784 | Tong Li | Zikang Chen, Tong Li, Jiajun Liao | Constraints on general neutrino interactions with exotic fermion from
neutrino-electron scattering experiments | 18 pages, 5 figures, 1 table. Version published in JHEP | null | 10.1007/JHEP05(2021)131 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The couplings between the neutrinos and exotic fermion can be probed in both
neutrino scattering experiments and dark matter direct detection experiments.
We present a detailed analysis of the general neutrino interactions with an
exotic fermion and electrons at neutrino-electron scattering experiments. We
obtain the constraints on the coupling coefficients of the scalar,
pseudoscalar, vector, axialvector, tensor and electromagnetic dipole
interactions from the CHARM-II, TEXONO and Borexino experiments. For the
flavor-universal interactions, we find that the Borexino experiment sets the
strongest bounds in the low mass region for the electromagnetic dipole
interactions, and the CHARM-II experiment dominates the bounds for other
scenarios. If the interactions are flavor dependent, the bounds from the
CHARM-II or TEXONO experiment can be avoided, and there are correlations
between the flavored coupling coefficients for the Borexino experiment. We also
discuss the detection of sub-MeV DM absorbed by bound electron targets and
illustrate that the vector coefficients preferred by XENON1T data is allowed by
the neutrino experiments.
| [
{
"created": "Fri, 19 Feb 2021 08:03:03 GMT",
"version": "v1"
},
{
"created": "Sat, 22 May 2021 08:22:02 GMT",
"version": "v2"
}
] | 2021-06-02 | [
[
"Chen",
"Zikang",
""
],
[
"Li",
"Tong",
""
],
[
"Liao",
"Jiajun",
""
]
] | The couplings between the neutrinos and exotic fermion can be probed in both neutrino scattering experiments and dark matter direct detection experiments. We present a detailed analysis of the general neutrino interactions with an exotic fermion and electrons at neutrino-electron scattering experiments. We obtain the constraints on the coupling coefficients of the scalar, pseudoscalar, vector, axialvector, tensor and electromagnetic dipole interactions from the CHARM-II, TEXONO and Borexino experiments. For the flavor-universal interactions, we find that the Borexino experiment sets the strongest bounds in the low mass region for the electromagnetic dipole interactions, and the CHARM-II experiment dominates the bounds for other scenarios. If the interactions are flavor dependent, the bounds from the CHARM-II or TEXONO experiment can be avoided, and there are correlations between the flavored coupling coefficients for the Borexino experiment. We also discuss the detection of sub-MeV DM absorbed by bound electron targets and illustrate that the vector coefficients preferred by XENON1T data is allowed by the neutrino experiments. |
1103.0008 | Qing-Hong Cao | Qing-Hong Cao, Asan Damanik, Ernest Ma, Daniel Wegman | Probing Lepton Flavor Triality with Higgs Boson Decay | PRD version | Phys.Rev.D83:093012,2011 | 10.1103/PhysRevD.83.093012 | ANL-HEP-PR-11-14, EFI-11-6, UCRHEP-T500 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | If neutrino tribimaximal mixing is explained by a non-Abelian discrete
symmetry such as $A_4$, $T_7$, $\Delta(27)$, etc., the charged-lepton Higgs
sector has a $Z_3$ residual symmetry (lepton flavor triality), which may be
observed directly in the decay chain $H^0 \to \psi_2^0 \bar\psi_2^0$, then
$\psi_2^0 (\bar\psi_2^0) \to l_i^+ l_j^- ~(i \neq j)$, where $H^0$ is a
standard-model-like Higgs boson and $\psi_2^0$ is a scalar particle needed for
realizing the original discrete symmetry. If kinematically allowed, this
unusual and easily detectable decay is observable at the LHC with 1 fb$^{-1}$
for E_{cm} = 7 TeV.
| [
{
"created": "Mon, 28 Feb 2011 21:00:05 GMT",
"version": "v1"
},
{
"created": "Tue, 3 May 2011 18:22:53 GMT",
"version": "v2"
}
] | 2011-07-08 | [
[
"Cao",
"Qing-Hong",
""
],
[
"Damanik",
"Asan",
""
],
[
"Ma",
"Ernest",
""
],
[
"Wegman",
"Daniel",
""
]
] | If neutrino tribimaximal mixing is explained by a non-Abelian discrete symmetry such as $A_4$, $T_7$, $\Delta(27)$, etc., the charged-lepton Higgs sector has a $Z_3$ residual symmetry (lepton flavor triality), which may be observed directly in the decay chain $H^0 \to \psi_2^0 \bar\psi_2^0$, then $\psi_2^0 (\bar\psi_2^0) \to l_i^+ l_j^- ~(i \neq j)$, where $H^0$ is a standard-model-like Higgs boson and $\psi_2^0$ is a scalar particle needed for realizing the original discrete symmetry. If kinematically allowed, this unusual and easily detectable decay is observable at the LHC with 1 fb$^{-1}$ for E_{cm} = 7 TeV. |
0810.4462 | Felipe J. Llanes-Estrada | Felipe J. Llanes-Estrada (Complutense Madrid), Pedro Bicudo, Marco
Cardoso (IST Lisboa), Tim Van Cauteren (Ghent) | Parity doubling in the high baryon spectrum: near-degenerate three-quark
quartets | Proceedings of the 2008 Bled miniworkshop "Few-Quark States and the
Continuum". Three references added | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report on the first calculation of excited baryons with a chirally
symmetric Hamiltonian, modeled after Coulomb gauge QCD (or upgraded from the
Cornell meson potential model to a field theory in all of Fock-space) showing
the insensitivity to chiral symmetry breaking. As has recently been understood,
this leads to doubling between two hadrons of equal spin and opposite parity.
As a novelty we show that three-quark, for example Delta states, group into
quartets with two states of each parity, all four states having equal angular
momentum J. Diagonalizing the chiral charge expressed in terms of quarks we
show that the quartet is slightly split into two parity doublets by the tensor
force, all splittings decreasing to zero high in the spectrum. Our specific
calculation is for the family of maximum-spin excitations of the Delta baryon.
We provide a model estimate of the experimental accuracy needed to establish
Chiral Symmetry Restoration in the high spectrum.
We suggest that a measurement of masses of high-partial wave Delta resonances
with an accuracy of 50 MeV should be sufficient to unambiguously establish the
approximate degeneracy, and test the concept of running quark mass in the
infrared.
| [
{
"created": "Fri, 24 Oct 2008 13:45:09 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Oct 2008 12:01:29 GMT",
"version": "v2"
}
] | 2008-10-28 | [
[
"Llanes-Estrada",
"Felipe J.",
"",
"Complutense Madrid"
],
[
"Bicudo",
"Pedro",
"",
"IST Lisboa"
],
[
"Cardoso",
"Marco",
"",
"IST Lisboa"
],
[
"Van Cauteren",
"Tim",
"",
"Ghent"
]
] | We report on the first calculation of excited baryons with a chirally symmetric Hamiltonian, modeled after Coulomb gauge QCD (or upgraded from the Cornell meson potential model to a field theory in all of Fock-space) showing the insensitivity to chiral symmetry breaking. As has recently been understood, this leads to doubling between two hadrons of equal spin and opposite parity. As a novelty we show that three-quark, for example Delta states, group into quartets with two states of each parity, all four states having equal angular momentum J. Diagonalizing the chiral charge expressed in terms of quarks we show that the quartet is slightly split into two parity doublets by the tensor force, all splittings decreasing to zero high in the spectrum. Our specific calculation is for the family of maximum-spin excitations of the Delta baryon. We provide a model estimate of the experimental accuracy needed to establish Chiral Symmetry Restoration in the high spectrum. We suggest that a measurement of masses of high-partial wave Delta resonances with an accuracy of 50 MeV should be sufficient to unambiguously establish the approximate degeneracy, and test the concept of running quark mass in the infrared. |
hep-ph/9802322 | Shi-Lin Zhu | Shi-Lin Zhu(1,2), W.-Y.P. Hwang(3) and Ze-sen Yang(1), ((1) Physics
Department, Peking University, (2) Institute of Theoretical Physics, Academia
Sinica, (3) Physics Department, National Taiwan University) | The $\Omega$ and $\Sigma^0$-$\Lambda$ transition magnetic moments in QCD
sum rules | null | Phys.Rev. D57 (1998) 1527-1530 | 10.1103/PhysRevD.57.1527 | null | hep-ph | null | The method of QCD sum rules in the presence of external elctromagnetic fields
is used to calculate the $\Omega$ magnetic moment $\mu_{\Omega^-}$ and
$\Sigma^0$-$\Lambda$ transition magnetic moment $\mu_{\Sigma^0\Lambda}$, with
the susceptibilities obtained previously from the study of octet baryon
magnetic moments. The results $\mu_{\Omega^-}=-1.92\mu_N$ and
$\mu_{\Sigma^0\Lambda}=1.5\mu_N$ are in good agreement with the recent
experimental data.
| [
{
"created": "Sat, 14 Feb 1998 02:36:00 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Zhu",
"Shi-Lin",
""
],
[
"Hwang",
"W. -Y. P.",
""
],
[
"Yang",
"Ze-sen",
""
]
] | The method of QCD sum rules in the presence of external elctromagnetic fields is used to calculate the $\Omega$ magnetic moment $\mu_{\Omega^-}$ and $\Sigma^0$-$\Lambda$ transition magnetic moment $\mu_{\Sigma^0\Lambda}$, with the susceptibilities obtained previously from the study of octet baryon magnetic moments. The results $\mu_{\Omega^-}=-1.92\mu_N$ and $\mu_{\Sigma^0\Lambda}=1.5\mu_N$ are in good agreement with the recent experimental data. |
hep-ph/0301243 | George Sterman | George Sterman | From Long to Short Distances in Perturbative QCD | 24 pages, eight eps figures. Based on talks presented at the
International Conference on Theoretical Physics, TH2002, Paris, UNESCO, July
22-27, 2002, and the 26th Johns Hopkins Workshop on Current Problems in
Particle Theory, Heidelberg, Aug. 1-3, 2002 | Int.J.Mod.Phys.A18:4329-4342,2003; Annales Henri Poincare
4:S259-S273,2003 | 10.1142/S0217751X03016173 | YITP-SB-02-80 | hep-ph | null | Infrared safe differential cross sections, such as event shape distributions,
can be measured over wide kinematic ranges, from regions where fixed order
calculations are adequate to regions where nonperturbative dynamics dominate.
Such observables provide an ideal laboratory for the study of the transition
between weak and strong coupling in quantum field theory. This talk begins with
some of the fundamentals of the perturbative description of QCD and the basis
of resummation techniques, followed by a brief discussion of selected topics
from recent fixed-order and resummed calculations. It focuses on how resummed
perturbation theory has been used to deduce the structure of nonperturbative
corrections, and to provide a framework with which to address the transition
from short- to long-distance dynamics in QCD.
| [
{
"created": "Tue, 28 Jan 2003 12:17:37 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Sterman",
"George",
""
]
] | Infrared safe differential cross sections, such as event shape distributions, can be measured over wide kinematic ranges, from regions where fixed order calculations are adequate to regions where nonperturbative dynamics dominate. Such observables provide an ideal laboratory for the study of the transition between weak and strong coupling in quantum field theory. This talk begins with some of the fundamentals of the perturbative description of QCD and the basis of resummation techniques, followed by a brief discussion of selected topics from recent fixed-order and resummed calculations. It focuses on how resummed perturbation theory has been used to deduce the structure of nonperturbative corrections, and to provide a framework with which to address the transition from short- to long-distance dynamics in QCD. |
hep-ph/9511206 | Tao Han | M. Golden, T. Han and G. Valencia | Strongly-Interacting Electroweak Sector --Model Independent Approaches-- | Report contributed to ESB & BSM Book, ed. by T. Barklow, S. Dawson,
H. Haber and J. Siegrist. LaTex file; 75 pages; 17 figures (not included
here). Complete ps file available by anonymous ftp at
ftp://ucdhep.ucdavis.edu/han/dpf/report/report_full.ps | null | 10.1142/9789812830265_0005 | UCD-95-32, ISU-HET-95-6 | hep-ph | null | Phenomenology of a strongly-interacting electroweak symmetry breaking sector
at current and future colliders is reviewed.
| [
{
"created": "Wed, 1 Nov 1995 21:20:50 GMT",
"version": "v1"
}
] | 2016-11-03 | [
[
"Golden",
"M.",
""
],
[
"Han",
"T.",
""
],
[
"Valencia",
"G.",
""
]
] | Phenomenology of a strongly-interacting electroweak symmetry breaking sector at current and future colliders is reviewed. |
1705.04419 | Nagisa Hiroshima | Nagisa Hiroshima, Ryuichiro Kitano, Kazunori Kohri, Kohta Murase | High-energy Neutrinos from Multi-body Decaying Dark Matter | 19 pages, 6 figures, to appear in PRD | Phys. Rev. D 97, 023006 (2018) | 10.1103/PhysRevD.97.023006 | KEK-Cosmo-202, KEK-TH-1979 | hep-ph astro-ph.CO astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Since the report of the PeV-TeV neutrinos by the IceCube Collaboration,
various particle physics models have been proposed to explain the neutrino
spectrum by dark matter particles decaying into neutrinos and other Standard
Model particles.In such scenarios, simultaneous $\gamma$-ray emission is
commonly expected. Therefore, multi-messenger connections are generally
important for the indirect searches of dark matters. The recent development of
$\gamma$-ray astronomy puts stringent constraints on the properties of dark
matter, especially by observations with the Fermi $\gamma$-ray satellite in the
last several years. Motivated by the lack of $\gamma$-ray as well as the shape
of the neutrino spectrum observed by IceCube, we discuss a scenario in which
the DM is a PeV scale particle which couples strongly to other invisible
particles and its decay products do not contain a charged particle. As an
example to realize such possibilities, we consider a model of fermionic dark
matter that decays into a neutrino and many invisible fermions. The dark matter
decay is secluded in the sense that the emitted products are mostly neutrinos
and dark fermions. One remarkable feature of this model is the resulting
broadband neutrino spectra around the energy scale of the dark matter. We apply
this model to multi-PeV dark matter, and discuss possible observable
consequences in light of the IceCube data. In particular, this model could
account for the large flux at medium energies of $\sim10-100$ TeV, possibly as
well as the second peak at PeV, without violating the stringent $\gamma$-ray
constraints from Fermi and air-shower experiments such as CASA-MIA.
| [
{
"created": "Fri, 12 May 2017 01:42:05 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Dec 2017 12:49:05 GMT",
"version": "v2"
}
] | 2018-01-17 | [
[
"Hiroshima",
"Nagisa",
""
],
[
"Kitano",
"Ryuichiro",
""
],
[
"Kohri",
"Kazunori",
""
],
[
"Murase",
"Kohta",
""
]
] | Since the report of the PeV-TeV neutrinos by the IceCube Collaboration, various particle physics models have been proposed to explain the neutrino spectrum by dark matter particles decaying into neutrinos and other Standard Model particles.In such scenarios, simultaneous $\gamma$-ray emission is commonly expected. Therefore, multi-messenger connections are generally important for the indirect searches of dark matters. The recent development of $\gamma$-ray astronomy puts stringent constraints on the properties of dark matter, especially by observations with the Fermi $\gamma$-ray satellite in the last several years. Motivated by the lack of $\gamma$-ray as well as the shape of the neutrino spectrum observed by IceCube, we discuss a scenario in which the DM is a PeV scale particle which couples strongly to other invisible particles and its decay products do not contain a charged particle. As an example to realize such possibilities, we consider a model of fermionic dark matter that decays into a neutrino and many invisible fermions. The dark matter decay is secluded in the sense that the emitted products are mostly neutrinos and dark fermions. One remarkable feature of this model is the resulting broadband neutrino spectra around the energy scale of the dark matter. We apply this model to multi-PeV dark matter, and discuss possible observable consequences in light of the IceCube data. In particular, this model could account for the large flux at medium energies of $\sim10-100$ TeV, possibly as well as the second peak at PeV, without violating the stringent $\gamma$-ray constraints from Fermi and air-shower experiments such as CASA-MIA. |
1707.04121 | J. Wallace Van Orden | J. W. Van Orden, T. W. Donnelly, O. Moreno | Coincidence charged-current neutrino-induced deuteron disintegration for
$^2\mathrm{H}_2{^{16}}\mathrm{O}$ | null | Phys. Rev. D 96, 113008 (2017) | 10.1103/PhysRevD.96.113008 | JLAB-THY-17-2515 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Semi-inclusive charge-changing neutrino reactions on targets of heavy water
are investigated with the goal of determining the relative contributions to the
total cross section of deuterium and oxygen in kinematics chosen to emphasize
the former. The study is undertaken for conditions where the typical neutrino
beam energies are in the few GeV region, and hence relativistic modeling is
essential. For this, the previous relativistic approach for the deuteron is
employed, together with a spectral function approach for the case of oxygen.
Upon optimizing the kinematics of the final-state particles assumed to be
detected (typically a muon and a proton) it is shown that the oxygen
contribution to the total cross section is suppressed by roughly an order of
magnitude compared with the deuterium cross section, thereby confirming that
CC$\nu$ studies of heavy water can effectively yield the cross sections for
deuterium, with acceptable backgrounds from oxygen. This opens the possibility
of using deuterium to determine the incident neutrino flux distribution, to
have it serve as a target for which the nuclear structure issues are minimal,
and possibly to use deuterium to provide improved knowledge of specific aspects
of hadronic structure, such as to explore the momentum transfer dependence of
the isovector axial-vector form factor of the nucleon.
| [
{
"created": "Thu, 13 Jul 2017 13:48:51 GMT",
"version": "v1"
}
] | 2018-01-03 | [
[
"Van Orden",
"J. W.",
""
],
[
"Donnelly",
"T. W.",
""
],
[
"Moreno",
"O.",
""
]
] | Semi-inclusive charge-changing neutrino reactions on targets of heavy water are investigated with the goal of determining the relative contributions to the total cross section of deuterium and oxygen in kinematics chosen to emphasize the former. The study is undertaken for conditions where the typical neutrino beam energies are in the few GeV region, and hence relativistic modeling is essential. For this, the previous relativistic approach for the deuteron is employed, together with a spectral function approach for the case of oxygen. Upon optimizing the kinematics of the final-state particles assumed to be detected (typically a muon and a proton) it is shown that the oxygen contribution to the total cross section is suppressed by roughly an order of magnitude compared with the deuterium cross section, thereby confirming that CC$\nu$ studies of heavy water can effectively yield the cross sections for deuterium, with acceptable backgrounds from oxygen. This opens the possibility of using deuterium to determine the incident neutrino flux distribution, to have it serve as a target for which the nuclear structure issues are minimal, and possibly to use deuterium to provide improved knowledge of specific aspects of hadronic structure, such as to explore the momentum transfer dependence of the isovector axial-vector form factor of the nucleon. |
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