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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0806.0998 | Xiang Liu | Hong-Wei Ke and Xiang Liu | The signal of $Z^\pm(4430)$ in nucleon-antinucleon scattering | 6 pages, 15 figures. Published version in EPJC | Eur.Phys.J.C58:217-221,2008 | 10.1140/epjc/s10052-008-0744-x | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the production of $Z^\pm(4430)$ at a nucleon-antinucleon scattering
experiment. Considering the PANDA experiment to be an ideal platform to explore
the production of the charmonium and charmonim-like states, we suggest the
forthcoming PANDA experiment to pay attention to the production of
$Z^\pm(4430)$.
| [
{
"created": "Thu, 5 Jun 2008 16:03:45 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Jun 2008 20:16:24 GMT",
"version": "v2"
},
{
"created": "Fri, 5 Sep 2008 15:25:21 GMT",
"version": "v3"
},
{
"created": "Thu, 2 Oct 2008 13:55:32 GMT",
"version": "v4"
}
] | 2008-11-27 | [
[
"Ke",
"Hong-Wei",
""
],
[
"Liu",
"Xiang",
""
]
] | We study the production of $Z^\pm(4430)$ at a nucleon-antinucleon scattering experiment. Considering the PANDA experiment to be an ideal platform to explore the production of the charmonium and charmonim-like states, we suggest the forthcoming PANDA experiment to pay attention to the production of $Z^\pm(4430)$. |
hep-ph/9605444 | null | D.Rainwater, R.Szalapski, and D.Zeppenfeld | Probing color-singlet exchange in $Z+2$-jet events at the LHC | 24 pages (with 7 embedded figures), Revtex, uses epsf.sty.
Z-compressed postscript version also available at
http://phenom.physics.wisc.edu/pub/preprints/1996/madph-96-943.ps.Z or at
ftp://phenom.physics.wisc.edu/pub/preprints/1996/madph-96-943.ps.Z | Phys.Rev.D54:6680-6689,1996 | 10.1103/PhysRevD.54.6680 | MADPH-96-943 | hep-ph | null | The purely electroweak process $qq\to qqZ$ (via $t$-channel $\gamma/Z$ or $W$
exchange) provides a copious and fairly clean source of color-singlet exchange
events in $pp$ collisions at the LHC. A judicious choice of phase-space region
allows the suppression of QCD backgrounds to the level of the signal. The
color-singlet-exchange signal can be distinguished from QCD backgrounds by the
radiation patterns of additional minijets in individual events. A rapidity-gap
trigger at the minijet level substantially enhances the signal versus the
background. Analogous features of weak boson scattering events make $Z+2$-jet
events at the LHC an ideal laboratory for investigation of the soft-jet
activity expected in weak-boson scattering events.
| [
{
"created": "Thu, 30 May 1996 18:54:07 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Rainwater",
"D.",
""
],
[
"Szalapski",
"R.",
""
],
[
"Zeppenfeld",
"D.",
""
]
] | The purely electroweak process $qq\to qqZ$ (via $t$-channel $\gamma/Z$ or $W$ exchange) provides a copious and fairly clean source of color-singlet exchange events in $pp$ collisions at the LHC. A judicious choice of phase-space region allows the suppression of QCD backgrounds to the level of the signal. The color-singlet-exchange signal can be distinguished from QCD backgrounds by the radiation patterns of additional minijets in individual events. A rapidity-gap trigger at the minijet level substantially enhances the signal versus the background. Analogous features of weak boson scattering events make $Z+2$-jet events at the LHC an ideal laboratory for investigation of the soft-jet activity expected in weak-boson scattering events. |
2210.17226 | Victor Goncalves | Yan B. Bandeira, Victor P. Goncalves | Higher twists effects in DIS on nuclei at the EIC and LHeC: A
phenomenological analysis | 9 pages, 6 figures. Improved version published in EPJA | null | 10.1140/epja/s10050-023-00942-8 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we investigate the impact of the higher - twist effects,
resummed by the non - linear approaches for the QCD dynamics, on the inclusive
observables that will be measured in future electron - ion colliders. We assume
a phenomenological model for the dipole - nucleus scattering amplitude which
takes into account the non - linear corrections and estimate the contribution
of the different twists for $F_2^A(x,Q^2)$, $F_L^A(x,Q^2)$ and $\partial F_2^A
/\partial ln Q^2$ considering different values of the Bjorken - $x$ variable,
photon virtuality $Q^2$ and atomic number $A$. A comparison with the full
predictions is performed and the impact of the distinct twists is estimated.
Our results indicate that a future analysis of the logarithmic $Q^2$ slope and
longitudinal structure function will allow us to probe the presence of the non
- linear effects on the QCD dynamics.
| [
{
"created": "Mon, 31 Oct 2022 11:09:16 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Feb 2023 16:12:12 GMT",
"version": "v2"
}
] | 2023-02-09 | [
[
"Bandeira",
"Yan B.",
""
],
[
"Goncalves",
"Victor P.",
""
]
] | In this paper we investigate the impact of the higher - twist effects, resummed by the non - linear approaches for the QCD dynamics, on the inclusive observables that will be measured in future electron - ion colliders. We assume a phenomenological model for the dipole - nucleus scattering amplitude which takes into account the non - linear corrections and estimate the contribution of the different twists for $F_2^A(x,Q^2)$, $F_L^A(x,Q^2)$ and $\partial F_2^A /\partial ln Q^2$ considering different values of the Bjorken - $x$ variable, photon virtuality $Q^2$ and atomic number $A$. A comparison with the full predictions is performed and the impact of the distinct twists is estimated. Our results indicate that a future analysis of the logarithmic $Q^2$ slope and longitudinal structure function will allow us to probe the presence of the non - linear effects on the QCD dynamics. |
hep-ph/9803345 | Marcus Bleicher | M. Bleicher, M. Belkacem, C. Ernst, H. Weber, L. Gerland, C. Spieles,
S. A. Bass, H. St\"ocker, W. Greiner (Institut f\"ur Theoretische Physik,
J.W.Goethe Universit\"at, Frankfurt am Main, Germany) | Can Momentum Correlations Proof Kinetic Equilibration in Heavy Ion
Collisions at 160 AGeV? | 9 pages, 3 eps figures, submitted to Phys. Lett. B | Phys.Lett. B435 (1998) 9-12 | 10.1016/S0370-2693(98)00831-4 | null | hep-ph | null | We perform an event-by-event analysis of the transverse momentum distribution
of final state particles in central Pb(160AGeV)+Pb collisions within a
microscopic non-equilibrium transport model (UrQMD). Strong influence of
rescattering is found. The extracted momentum distributions show less
fluctuations in A+A collisions than in p+p reactions. This is in contrast to
simplified p+p extrapolations and random walk models.
| [
{
"created": "Fri, 13 Mar 1998 17:04:36 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Bleicher",
"M.",
"",
"Institut für Theoretische Physik,\n J.W.Goethe Universität, Frankfurt am Main, Germany"
],
[
"Belkacem",
"M.",
"",
"Institut für Theoretische Physik,\n J.W.Goethe Universität, Frankfurt am Main, Germany"
],
[
"Ernst",
"C.",
"",
"Inst... | We perform an event-by-event analysis of the transverse momentum distribution of final state particles in central Pb(160AGeV)+Pb collisions within a microscopic non-equilibrium transport model (UrQMD). Strong influence of rescattering is found. The extracted momentum distributions show less fluctuations in A+A collisions than in p+p reactions. This is in contrast to simplified p+p extrapolations and random walk models. |
2310.13057 | Yik Chuen San | Marat Freytsis, Maxim Perelstein, Yik Chuen San | Anomaly Detection in Presence of Irrelevant Features | 24 pages, 7 figures. v2: Figure 6 updated | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Experiments at particle colliders are the primary source of insight into
physics at microscopic scales. Searches at these facilities often rely on
optimization of analyses targeting specific models of new physics.
Increasingly, however, data-driven model-agnostic approaches based on machine
learning are also being explored. A major challenge is that such methods can be
highly sensitive to the presence of many irrelevant features in the data. This
paper presents Boosted Decision Tree (BDT)-based techniques to improve anomaly
detection in the presence of many irrelevant features. First, a BDT classifier
is shown to be more robust than neural networks for the Classification Without
Labels approach to finding resonant excesses assuming independence of resonant
and non-resonant observables. Next, a tree-based probability density estimator
using copula transformations demonstrates significant stability and improved
performance over normalizing flows as irrelevant features are added. The
results make a compelling case for further development of tree-based algorithms
for more robust resonant anomaly detection in high energy physics.
| [
{
"created": "Thu, 19 Oct 2023 18:00:05 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Nov 2023 02:25:43 GMT",
"version": "v2"
}
] | 2023-11-16 | [
[
"Freytsis",
"Marat",
""
],
[
"Perelstein",
"Maxim",
""
],
[
"San",
"Yik Chuen",
""
]
] | Experiments at particle colliders are the primary source of insight into physics at microscopic scales. Searches at these facilities often rely on optimization of analyses targeting specific models of new physics. Increasingly, however, data-driven model-agnostic approaches based on machine learning are also being explored. A major challenge is that such methods can be highly sensitive to the presence of many irrelevant features in the data. This paper presents Boosted Decision Tree (BDT)-based techniques to improve anomaly detection in the presence of many irrelevant features. First, a BDT classifier is shown to be more robust than neural networks for the Classification Without Labels approach to finding resonant excesses assuming independence of resonant and non-resonant observables. Next, a tree-based probability density estimator using copula transformations demonstrates significant stability and improved performance over normalizing flows as irrelevant features are added. The results make a compelling case for further development of tree-based algorithms for more robust resonant anomaly detection in high energy physics. |
hep-ph/0201044 | Thorsten Feldmann | Th. Feldmann (RWTH Aachen, Germany), and P. Kroll (Univ. Wuppertal,
Germany) | Mixing of Pseudoscalar Mesons | 21 pages, 6 figures, Proc. WORKSHOP ON ETA PHYSICS, Uppsala, October
22-27, 2001 | Phys.Scripta T99 (2002) 13-22 | 10.1238/Physica.Topical.099a00013 | WU B 02-01, PITHA 02-01 | hep-ph nucl-ex nucl-th | null | Eta-eta' mixing is discussed in the quark-flavor basis with the hypothesis
that the decay constants follow the pattern of particle state mixing. On
exploiting the divergences of the axial vector currents - which embody the
axial vector anomaly - all mixing parameters are fixed to first order of flavor
symmetry breaking. An alternative set of parameters is obtained from a
phenomenological analysis. We also discuss mixing in the octet-singlet basis
and show how the relevant mixing parameters are related to those in the
quark-flavor basis. The dependence of the mixing parameters on the strength of
the anomaly and the amount of flavor symmetry breaking is investigated.
Finally, we present a few applications of the quark-flavor mixing scheme, such
as radiative decays of vector mesons, the photon-pseudoscalar meson transition
form factors, the coupling constants of eta and eta' to nucleons, and the
isospin-singlet admixtures to the pi^0 meson.
| [
{
"created": "Tue, 8 Jan 2002 10:09:03 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Feldmann",
"Th.",
"",
"RWTH Aachen, Germany"
],
[
"Kroll",
"P.",
"",
"Univ. Wuppertal,\n Germany"
]
] | Eta-eta' mixing is discussed in the quark-flavor basis with the hypothesis that the decay constants follow the pattern of particle state mixing. On exploiting the divergences of the axial vector currents - which embody the axial vector anomaly - all mixing parameters are fixed to first order of flavor symmetry breaking. An alternative set of parameters is obtained from a phenomenological analysis. We also discuss mixing in the octet-singlet basis and show how the relevant mixing parameters are related to those in the quark-flavor basis. The dependence of the mixing parameters on the strength of the anomaly and the amount of flavor symmetry breaking is investigated. Finally, we present a few applications of the quark-flavor mixing scheme, such as radiative decays of vector mesons, the photon-pseudoscalar meson transition form factors, the coupling constants of eta and eta' to nucleons, and the isospin-singlet admixtures to the pi^0 meson. |
hep-ph/0101276 | Robert Fleischer | Robert Fleischer, Thomas Mannel | General Analysis of New Physics in $B\to J/\psi K$ | 14 pages, LaTeX, no figures | Phys.Lett.B506:311-322,2001 | 10.1016/S0370-2693(01)00346-X | DESY 01-006, CERN-TH/2001-012, TTP01-06 | hep-ph | null | We present a model-independent parametrization of the $B^\pm\to J/\psi
K^\pm$, $B_d\to J/\psi K_S$ decay amplitudes by taking into account the
constraints that are implied by the isospin symmetry of strong interactions.
Employing estimates borrowed from effective field theory, we explore the impact
of physics beyond the Standard Model and introduce -- in addition to the usual
mixing-induced CP asymmetry $A_{CP}^{mix}$ in $B_d\to J/\psi K_S$ -- a set of
three observables, allowing a general analysis of possible new-physics effects
in the $B\to J/\psi K$ system. Imposing a dynamical hierarchy of amplitudes, we
argue that one of these observables may already be accessible at the
first-generation $B$-factories, whereas the remaining ones will probably be
left for second-generation $B$ experiments. However, in the presence of large
rescattering effects, all three new-physics observables may be sizeable. We
also emphasize that a small value of $A_{CP}^{mix}$ could be due to new-physics
effects arising at the $B\to J/\psi K$ decay-amplitude level. In order to
establish such a scenario, the observables introduced in this paper play a key
role.
| [
{
"created": "Wed, 24 Jan 2001 15:20:29 GMT",
"version": "v1"
}
] | 2011-01-27 | [
[
"Fleischer",
"Robert",
""
],
[
"Mannel",
"Thomas",
""
]
] | We present a model-independent parametrization of the $B^\pm\to J/\psi K^\pm$, $B_d\to J/\psi K_S$ decay amplitudes by taking into account the constraints that are implied by the isospin symmetry of strong interactions. Employing estimates borrowed from effective field theory, we explore the impact of physics beyond the Standard Model and introduce -- in addition to the usual mixing-induced CP asymmetry $A_{CP}^{mix}$ in $B_d\to J/\psi K_S$ -- a set of three observables, allowing a general analysis of possible new-physics effects in the $B\to J/\psi K$ system. Imposing a dynamical hierarchy of amplitudes, we argue that one of these observables may already be accessible at the first-generation $B$-factories, whereas the remaining ones will probably be left for second-generation $B$ experiments. However, in the presence of large rescattering effects, all three new-physics observables may be sizeable. We also emphasize that a small value of $A_{CP}^{mix}$ could be due to new-physics effects arising at the $B\to J/\psi K$ decay-amplitude level. In order to establish such a scenario, the observables introduced in this paper play a key role. |
0809.2940 | Eligio Lisi | G.L. Fogli (Bari U. & INFN, Bari), E. Lisi (INFN, Bari), A. Marrone
(Bari U. & INFN, Bari), A. Mirizzi (INFN, Bari & Munich, Max Planck Inst.) | Supernova neutrinos: Strong coupling effects of weak interactions | Proceedings of NO-VE 2008, IV International Workshop on "Neutrino
Oscillations in Venice" (Venice, Italy, April 15-18, 2008), edited by M.
Baldo Ceolin (University of Padova publication, Papergraf Editions, Padova,
Italy, 2008), pages 233-240 | null | null | null | hep-ph astro-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In core-collapse supernovae, neutrinos and antineutrinos are initially
subject to significant self-interactions induced by weak neutral currents,
which may induce strong-coupling effects on the flavor evolution (collective
transitions). The interpretation of the effects is simplified when self-induced
collective transitions are decoupled from ordinary matter oscillations, as for
the matter density profile that we discuss. In this case, approximate
analytical tools can be used (pendulum analogy, swap of energy spectra). For
inverted neutrino mass hierarchy, the sequence of effects involves:
synchronization, bipolar oscillations, and spectral split. Our simulations
shows that the main features of these regimes are not altered when passing from
simplified (angle-averaged) treatments to full, multi-angle numerical
experiments.
| [
{
"created": "Wed, 17 Sep 2008 14:49:57 GMT",
"version": "v1"
}
] | 2008-09-19 | [
[
"Fogli",
"G. L.",
"",
"Bari U. & INFN, Bari"
],
[
"Lisi",
"E.",
"",
"INFN, Bari"
],
[
"Marrone",
"A.",
"",
"Bari U. & INFN, Bari"
],
[
"Mirizzi",
"A.",
"",
"INFN, Bari & Munich, Max Planck Inst."
]
] | In core-collapse supernovae, neutrinos and antineutrinos are initially subject to significant self-interactions induced by weak neutral currents, which may induce strong-coupling effects on the flavor evolution (collective transitions). The interpretation of the effects is simplified when self-induced collective transitions are decoupled from ordinary matter oscillations, as for the matter density profile that we discuss. In this case, approximate analytical tools can be used (pendulum analogy, swap of energy spectra). For inverted neutrino mass hierarchy, the sequence of effects involves: synchronization, bipolar oscillations, and spectral split. Our simulations shows that the main features of these regimes are not altered when passing from simplified (angle-averaged) treatments to full, multi-angle numerical experiments. |
hep-ph/9707459 | Randall J. Scalise | Fredrick I. Olness and Randall J. Scalise (SMU) | Heavy Quark Parton Distributions: Mass-Dependent or Mass-Independent
Evolution? | 6 pages, LaTeX, 4 PostScript figures, uses epsf.sty and aipproc.sty;
Contribution to DIS97 Workshop, 14-18 April, Chicago, IL, USA | Phys.Rev. D57 (1998) 241-244 | 10.1103/PhysRevD.57.241 | CTEQ-708, SMU-HEP-9709 | hep-ph | null | In a consistently formulated pQCD framework incorporating non-zero mass heavy
quark partons, there is still the freedom to define parton distributions
obeying either mass-independent or mass-dependent evolution equations, contrary
to statements made in a recent paper by MRRS. With properly matched hard
cross-sections, different choices merely correspond to different factorization
schemes, and they yield the same physical cross-sections. We demonstrate this
principle in a concrete order \alpha_s calculation of the DIS charm structure
function. We also examine the proper matching between parton definitions and
subtractions in the hard cross-section near threshold where the calculation is
particularly sensitive to mass effects of the heavy quark. The results obtained
from the general-mass formalism are quite stable against different choices of
scale and exhibit a smooth transition in the threshold region (using either
mass-independent or mass-dependent evolution), in contrast to results of
another recently proposed scheme.
| [
{
"created": "Fri, 25 Jul 1997 02:04:02 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Olness",
"Fredrick I.",
"",
"SMU"
],
[
"Scalise",
"Randall J.",
"",
"SMU"
]
] | In a consistently formulated pQCD framework incorporating non-zero mass heavy quark partons, there is still the freedom to define parton distributions obeying either mass-independent or mass-dependent evolution equations, contrary to statements made in a recent paper by MRRS. With properly matched hard cross-sections, different choices merely correspond to different factorization schemes, and they yield the same physical cross-sections. We demonstrate this principle in a concrete order \alpha_s calculation of the DIS charm structure function. We also examine the proper matching between parton definitions and subtractions in the hard cross-section near threshold where the calculation is particularly sensitive to mass effects of the heavy quark. The results obtained from the general-mass formalism are quite stable against different choices of scale and exhibit a smooth transition in the threshold region (using either mass-independent or mass-dependent evolution), in contrast to results of another recently proposed scheme. |
1501.03422 | Fernando Navarra | F. S. Navarra, M. Nielsen, E. Oset, T. Sekihara | Testing the molecular nature of $\bm{D_{s 0}^{\ast}(2317)}$ and
$\bm{D_{0}^{\ast} (2400)}$ in semileptonic $\bm{B_s}$ and $\bm{B}$ decays | 16 pages, 7 figures, new references | Phys. Rev. D 92, 014031 (2015) | 10.1103/PhysRevD.92.014031 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the semileptonic $B_s$ and $B$ decays into the $D_{s 0}^{\ast}
(2317)$ and $D_{0}^{\ast} (2400)$ resonances, respectively. With the help of a
chiral unitarity model in coupled channels we compute the ratio of the decay
widths of both processes. Using current values of the width for the
$\bar{B}^{0} \to D_{0}^{\ast} (2400)^{+} \bar{\nu}_{l} l^{-}$ decay we make
predictions for the rate of the $\bar{B}_{s}^{0} \to D_{s0}^{\ast} (2317)^{+}
\bar{\nu}_{l} l^{-}$ decay.
| [
{
"created": "Wed, 14 Jan 2015 17:40:56 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Jan 2015 17:31:47 GMT",
"version": "v2"
}
] | 2015-08-05 | [
[
"Navarra",
"F. S.",
""
],
[
"Nielsen",
"M.",
""
],
[
"Oset",
"E.",
""
],
[
"Sekihara",
"T.",
""
]
] | We study the semileptonic $B_s$ and $B$ decays into the $D_{s 0}^{\ast} (2317)$ and $D_{0}^{\ast} (2400)$ resonances, respectively. With the help of a chiral unitarity model in coupled channels we compute the ratio of the decay widths of both processes. Using current values of the width for the $\bar{B}^{0} \to D_{0}^{\ast} (2400)^{+} \bar{\nu}_{l} l^{-}$ decay we make predictions for the rate of the $\bar{B}_{s}^{0} \to D_{s0}^{\ast} (2317)^{+} \bar{\nu}_{l} l^{-}$ decay. |
hep-ph/0412053 | Thomas Hambye | Thomas Hambye | Various realizations of leptogenesis and neutrino mass constraints | Talk given at International Conference on the Seesaw Mechanism,
Paris, France, 10-11 June 2004, 18 pages | null | 10.1142/9789812702210_0011 | null | hep-ph | null | Seven types of leptogenesis models which can lead to a successful explanation
of baryogenesis are presented. Emphasis is put on the conditions which need to
be fulfilled by the neutrino masses as well as by the heavy state masses. The
model dependence of these conditions is discussed.
| [
{
"created": "Fri, 3 Dec 2004 17:56:25 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Hambye",
"Thomas",
""
]
] | Seven types of leptogenesis models which can lead to a successful explanation of baryogenesis are presented. Emphasis is put on the conditions which need to be fulfilled by the neutrino masses as well as by the heavy state masses. The model dependence of these conditions is discussed. |
1311.5746 | Christopher Schwan | Daniel Goetz, Christopher Schwan and Stefan Weinzierl | Dipole subtraction with random polarisations | 8 pages, 4 figures 1 table. Presented at the 11th International
Symposium on Radiative Corrections (Applications of Quantum Field Theory to
Phenomenology) - RADCOR 2013, 22-27 September 2013, Lumley Castle Hotel,
Durham, UK | null | null | null | hep-ph | http://creativecommons.org/licenses/by-nc-sa/3.0/ | In this talk, we discuss the speed-up of numerical calculations of jet
observables by replacing the usual sum over all helicity amplitudes with an
integral over a parametrisation for the parton polarisations called random
polarisations. Random polarisations are a linear combination of helicity
eigenstates multiplied by a phase factor depending on a so-called helicity
angle. Instead of a summation over discrete helicities, random polarisations
require an integration over the helicity angle. By combining this integral with
the final-state phase space integral, we only have to evaluate one squared
amplitude per phase space point instead of $2^n$ helicity amplitudes, where $n$
is the total number of particles in the process. While the technique itself has
been known since 1998, so far there has been no way of using it with dipole
subtraction, which is probably the most-used method for dealing with infrared
divergences in NLO calculations. After giving detailed reasons for this
statement, we propose a solution to this problem in terms of extending the
existing subtraction method by a new term.
| [
{
"created": "Fri, 22 Nov 2013 13:25:26 GMT",
"version": "v1"
}
] | 2013-11-25 | [
[
"Goetz",
"Daniel",
""
],
[
"Schwan",
"Christopher",
""
],
[
"Weinzierl",
"Stefan",
""
]
] | In this talk, we discuss the speed-up of numerical calculations of jet observables by replacing the usual sum over all helicity amplitudes with an integral over a parametrisation for the parton polarisations called random polarisations. Random polarisations are a linear combination of helicity eigenstates multiplied by a phase factor depending on a so-called helicity angle. Instead of a summation over discrete helicities, random polarisations require an integration over the helicity angle. By combining this integral with the final-state phase space integral, we only have to evaluate one squared amplitude per phase space point instead of $2^n$ helicity amplitudes, where $n$ is the total number of particles in the process. While the technique itself has been known since 1998, so far there has been no way of using it with dipole subtraction, which is probably the most-used method for dealing with infrared divergences in NLO calculations. After giving detailed reasons for this statement, we propose a solution to this problem in terms of extending the existing subtraction method by a new term. |
1608.08676 | Guillermo Palacio | Guillermo Palacio | Neutrino masses in the $SU(4)_L \otimes U(1)_X$ electroweak extension of
the standard model | 14 pages, 2 figures, Accepted to IJMPA | Int. J. Mod. Phys. A, 31, 1650142 (2016) | 10.1142/S0217751X16501426 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the neutrino mass generation in the $SU(4)_L \otimes U(1)_X$
electroweak extension of the standard model by considering non-renormalizable
dimension five effective operators. It is shown that there exist two topologies
for the realizations of such an operator at the tree-level and for one of the
three-family models is explore the neutrino phenomenology after extending its
particle content with an $SU(4)_L$ fermion singlet and a scalar decuplet.
Constraints in the available parameters space of the model are partially
discussed.
| [
{
"created": "Tue, 30 Aug 2016 22:39:42 GMT",
"version": "v1"
}
] | 2016-09-09 | [
[
"Palacio",
"Guillermo",
""
]
] | We study the neutrino mass generation in the $SU(4)_L \otimes U(1)_X$ electroweak extension of the standard model by considering non-renormalizable dimension five effective operators. It is shown that there exist two topologies for the realizations of such an operator at the tree-level and for one of the three-family models is explore the neutrino phenomenology after extending its particle content with an $SU(4)_L$ fermion singlet and a scalar decuplet. Constraints in the available parameters space of the model are partially discussed. |
1312.7489 | Zhi-Gang Wang | Zhi-Gang Wang, Tao Huang | Possible assignments of the $X(3872)$, $Z_c(3900)$ and $Z_b(10610)$ as
axial-vector molecular states | 20 pages, 20 figures, add detailed discussions. arXiv admin note:
substantial text overlap with arXiv:1310.2422, arXiv:1312.2652,
arXiv:1312.1537, arXiv:1311.1046 | Eur.Phys.J.C74(2014)2891 | 10.1140/epjc/s10052-014-2891-6 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article, we construct both the color singlet-singlet type and
octet-octet type currents to interpolate the $X(3872)$, $Z_c(3900)$,
$Z_b(10610)$, and calculate the vacuum condensates up to dimension-10 in the
operator product expansion. Then we study the axial-vector hidden charmed and
hidden bottom molecular states with the QCD sum rules, explore the energy scale
dependence of the QCD sum rules for the heavy molecular states in details, and
use the formula $\mu=\sqrt{M^2_{X/Y/Z}-(2{\mathbb{M}}_Q)^2}$ with the effective
masses ${\mathbb{M}}_Q$ to determine the energy scales. The numerical results
support assigning the $X(3872)$, $Z_c(3900)$, $Z_b(10610)$ as the color
singlet-singlet type molecular states with $J^{PC}=1^{++}$, $1^{+-}$, $1^{+-}$,
respectively, more theoretical and experimental works are still needed to
distinguish the molecule and tetraquark assignments; while there are no
candidates for the color octet-octet type molecular states.
| [
{
"created": "Sun, 29 Dec 2013 01:55:58 GMT",
"version": "v1"
},
{
"created": "Mon, 31 Mar 2014 06:49:39 GMT",
"version": "v2"
}
] | 2014-05-22 | [
[
"Wang",
"Zhi-Gang",
""
],
[
"Huang",
"Tao",
""
]
] | In this article, we construct both the color singlet-singlet type and octet-octet type currents to interpolate the $X(3872)$, $Z_c(3900)$, $Z_b(10610)$, and calculate the vacuum condensates up to dimension-10 in the operator product expansion. Then we study the axial-vector hidden charmed and hidden bottom molecular states with the QCD sum rules, explore the energy scale dependence of the QCD sum rules for the heavy molecular states in details, and use the formula $\mu=\sqrt{M^2_{X/Y/Z}-(2{\mathbb{M}}_Q)^2}$ with the effective masses ${\mathbb{M}}_Q$ to determine the energy scales. The numerical results support assigning the $X(3872)$, $Z_c(3900)$, $Z_b(10610)$ as the color singlet-singlet type molecular states with $J^{PC}=1^{++}$, $1^{+-}$, $1^{+-}$, respectively, more theoretical and experimental works are still needed to distinguish the molecule and tetraquark assignments; while there are no candidates for the color octet-octet type molecular states. |
1101.0459 | Makiko Nio | T. Aoyama, M. Hayakawa, T. Kinoshita, and M. Nio | Tenth-Order QED contribution to Lepton Anomalous Magnetic Moment -
Fourth-Order Vertices Containing Sixth-Order Vacuum-Polarization Subdiagrams | 29 pages, 5 figures. References are added | Phys.Rev.D83:053002,2011 | 10.1103/PhysRevD.83.053002 | RIKEN-TH-202 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper reports the tenth-order contributions to the g-2 of the electron
a_e and those of the muon a_mu from the gauge-invariant Set II(c), which
consists of 36 Feynman diagrams, and Set II(d), which consists of 180 Feynman
diagrams. Both sets are obtained by insertion of sixth-order
vacuum-polarization diagrams in the fourth-order anomalous magnetic moment. The
mass-independent contributions from Set II(c) and Set II(d) are -0.116 489
(32)(alpha/pi)^5 and -0.243 00 (29)(alpha/pi)^5, respectively. The leading
contributions to a_mu, which involve electron loops only, are -3.888 27
(90)(alpha/pi)^5 and 0.4972 (65)(alpha/pi)^5 for Set II(c) and Set II(d),
respectively. The total contributions of the electron, muon, and tau-lepton
loops to a_e are -0.116 874 (32) (alpha/pi)^5 for Set II(c) and -0.243 10 (29)
(alpha/pi)^5 for Set II(d). The contributions of electron, muon, and tau-lepton
loops to a_mu are -5.5594 (11) (alpha/pi)^5 for Set II(c) and 0.2465 (65)
(alpha/pi)^5 for Set II(d).
| [
{
"created": "Mon, 3 Jan 2011 07:26:50 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Feb 2011 03:57:29 GMT",
"version": "v2"
}
] | 2015-03-17 | [
[
"Aoyama",
"T.",
""
],
[
"Hayakawa",
"M.",
""
],
[
"Kinoshita",
"T.",
""
],
[
"Nio",
"M.",
""
]
] | This paper reports the tenth-order contributions to the g-2 of the electron a_e and those of the muon a_mu from the gauge-invariant Set II(c), which consists of 36 Feynman diagrams, and Set II(d), which consists of 180 Feynman diagrams. Both sets are obtained by insertion of sixth-order vacuum-polarization diagrams in the fourth-order anomalous magnetic moment. The mass-independent contributions from Set II(c) and Set II(d) are -0.116 489 (32)(alpha/pi)^5 and -0.243 00 (29)(alpha/pi)^5, respectively. The leading contributions to a_mu, which involve electron loops only, are -3.888 27 (90)(alpha/pi)^5 and 0.4972 (65)(alpha/pi)^5 for Set II(c) and Set II(d), respectively. The total contributions of the electron, muon, and tau-lepton loops to a_e are -0.116 874 (32) (alpha/pi)^5 for Set II(c) and -0.243 10 (29) (alpha/pi)^5 for Set II(d). The contributions of electron, muon, and tau-lepton loops to a_mu are -5.5594 (11) (alpha/pi)^5 for Set II(c) and 0.2465 (65) (alpha/pi)^5 for Set II(d). |
1206.2593 | Yutaka Tobita | Kenzo Ishikawa and Yutaka Tobita | Matter-enhanced transition probabilities in quantum field theory | 96 pages, 23 figures, title changed, previous parts I and II
(1209.5586) combined again, published version in Annals of Physics | Annals Phys. 344 (2014) 118-178 | 10.1016/j.aop.2014.02.007 | EPHOU-12-004 | hep-ph hep-ex quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The relativistic quantum field theory is the unique theory that combines the
relativity and quantum theory and is invariant under the Poincar\'e
transformation. The ground state, vacuum, is singlet and one particle states
are transformed as elements of irreducible representation of the group. The
covariant one particles are momentum eigenstates expressed by plane waves and
extended in space. Although the S-matrix defined with initial and final states
of these states hold the symmetries and are applied to isolated states,
out-going states for the amplitude of the event that they are detected at a
finite-time interval T in experiments are expressed by microscopic states that
they interact with, and are surrounded by matters in detectors and are not
plane waves. These matter-induced effects modify the probabilities observed in
realistic situations. The transition amplitudes and probabilities of the events
are studied with the S-matrix, $S[\text T]$, that satisfies the boundary
condition at T. Using $S[\text T]$, the finite-size corrections of the form of
${1/\text T}$ are found. The corrections to the Fermi's golden rule become
larger than the original values in some situations for light particles. They
break Lorentz invariance even in high energy region of short de Broglie wave
lengths.
| [
{
"created": "Tue, 12 Jun 2012 17:08:47 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Sep 2012 10:27:11 GMT",
"version": "v2"
},
{
"created": "Wed, 7 May 2014 07:57:21 GMT",
"version": "v3"
}
] | 2014-05-08 | [
[
"Ishikawa",
"Kenzo",
""
],
[
"Tobita",
"Yutaka",
""
]
] | The relativistic quantum field theory is the unique theory that combines the relativity and quantum theory and is invariant under the Poincar\'e transformation. The ground state, vacuum, is singlet and one particle states are transformed as elements of irreducible representation of the group. The covariant one particles are momentum eigenstates expressed by plane waves and extended in space. Although the S-matrix defined with initial and final states of these states hold the symmetries and are applied to isolated states, out-going states for the amplitude of the event that they are detected at a finite-time interval T in experiments are expressed by microscopic states that they interact with, and are surrounded by matters in detectors and are not plane waves. These matter-induced effects modify the probabilities observed in realistic situations. The transition amplitudes and probabilities of the events are studied with the S-matrix, $S[\text T]$, that satisfies the boundary condition at T. Using $S[\text T]$, the finite-size corrections of the form of ${1/\text T}$ are found. The corrections to the Fermi's golden rule become larger than the original values in some situations for light particles. They break Lorentz invariance even in high energy region of short de Broglie wave lengths. |
2105.01554 | Lao Tse L\'opez PhD | S. G\'omez-\'Avila, L. L\'opez-Lozano, Pedro Miranda-Romagnoli, R.
Noriega-Papaqui, Pedro Lagos-Eulogio | 2-zeroes texture and the Universal Texture Constraint | 21 pages, 15 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Texture matrices are a way of mitigating the redundancy inherent in the
description of flavor physics via Yukawa couplings by eliminating some entries
in order to identify relevant parameters. A four-zero texture scheme has been
used in the literature to successfully describe fermion masses and mixing.
However, as we show in this work, improving experimental constraints require an
update to this analysis. In this paper the implications of a 2-zero texture
mass matrix is studied for quarks and leptons. We show that the introduction of
a new parameter in each mass matrix allow us to reach good results with
relative low cost in predictability. We report a numerical study using a
hybridized nature-inspired/cellular automata search algorithm. We find that
leptons and quarks can be described by the same 1-zero structure. We describe
some scenarios where a simplified description can be achieved, including a
narrow region in parameter space where the same values describe charged leptons
and neutrinos, which is a stronger version of a previously proposed Universal
Texture Constraint.
| [
{
"created": "Tue, 4 May 2021 15:10:42 GMT",
"version": "v1"
}
] | 2021-05-05 | [
[
"Gómez-Ávila",
"S.",
""
],
[
"López-Lozano",
"L.",
""
],
[
"Miranda-Romagnoli",
"Pedro",
""
],
[
"Noriega-Papaqui",
"R.",
""
],
[
"Lagos-Eulogio",
"Pedro",
""
]
] | Texture matrices are a way of mitigating the redundancy inherent in the description of flavor physics via Yukawa couplings by eliminating some entries in order to identify relevant parameters. A four-zero texture scheme has been used in the literature to successfully describe fermion masses and mixing. However, as we show in this work, improving experimental constraints require an update to this analysis. In this paper the implications of a 2-zero texture mass matrix is studied for quarks and leptons. We show that the introduction of a new parameter in each mass matrix allow us to reach good results with relative low cost in predictability. We report a numerical study using a hybridized nature-inspired/cellular automata search algorithm. We find that leptons and quarks can be described by the same 1-zero structure. We describe some scenarios where a simplified description can be achieved, including a narrow region in parameter space where the same values describe charged leptons and neutrinos, which is a stronger version of a previously proposed Universal Texture Constraint. |
1807.06582 | Wen Yin | Yuta Hamada, Ryuichiro Kitano, and Wen Yin | Leptogenesis via Neutrino Oscillation Magic | 39pages, 18 figures; v2: version to appear in JHEP | JHEP10(2018)178 | 10.1007/JHEP10(2018)178 | KEK-TH-2064 | hep-ph astro-ph.CO gr-qc hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The possibility of generating the baryon asymmetry of the Universe via flavor
oscillation in the early Universe is discussed. After the inflation, leptons
are born in some states, travel in the medium, and are eventually projected
onto flavor eigenstates due to the scattering via the Yukawa interactions. By
using the Lagrangian of the Standard Model with the Majorana neutrino mass
terms, llHH, we follow the time evolution of the density matrices of the
leptons in this very first stage of the Universe and show that the CP violation
in the flavor oscillation can explain the baryon asymmetry of the Universe. In
the scenario where the reheating is caused by the decay of the inflaton into
the Higgs bosons, the baryon asymmetry is generated by the CP phases in the
Pontecorvo-Maki-Nakagawa-Sakata matrix and thus can be tested by the low energy
neutrino experiments.
| [
{
"created": "Tue, 17 Jul 2018 17:54:53 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Oct 2018 02:49:54 GMT",
"version": "v2"
}
] | 2018-11-01 | [
[
"Hamada",
"Yuta",
""
],
[
"Kitano",
"Ryuichiro",
""
],
[
"Yin",
"Wen",
""
]
] | The possibility of generating the baryon asymmetry of the Universe via flavor oscillation in the early Universe is discussed. After the inflation, leptons are born in some states, travel in the medium, and are eventually projected onto flavor eigenstates due to the scattering via the Yukawa interactions. By using the Lagrangian of the Standard Model with the Majorana neutrino mass terms, llHH, we follow the time evolution of the density matrices of the leptons in this very first stage of the Universe and show that the CP violation in the flavor oscillation can explain the baryon asymmetry of the Universe. In the scenario where the reheating is caused by the decay of the inflaton into the Higgs bosons, the baryon asymmetry is generated by the CP phases in the Pontecorvo-Maki-Nakagawa-Sakata matrix and thus can be tested by the low energy neutrino experiments. |
hep-ph/9801381 | null | Edmond L. Berger (Argonne) | Threshold Resummation of Soft Gluons in Hadronic Reactions -- An
Introduction | 15 pages. latex, one figure. Invited paper to be published in the
Proceedings of the Symposium on QCD Corrections and New Physics, Hiroshima,
October 27 - 29, 1997 | null | null | ANL-HEP-CP-98-03 | hep-ph | null | I discuss the motivation for resummation of the effects of initial-state soft
gluon radiation, to all orders in the strong coupling strength, for processes
in which the near-threshold region in the partonic subenergy is important. I
summarize the method of "perturbative resummation" and its application to the
calculation of the total cross section for top quark production at hadron
colliders. Comments are included on the differences between the treatment of
subleading logarithmic terms in this method and in other approaches.
| [
{
"created": "Wed, 21 Jan 1998 19:31:01 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Berger",
"Edmond L.",
"",
"Argonne"
]
] | I discuss the motivation for resummation of the effects of initial-state soft gluon radiation, to all orders in the strong coupling strength, for processes in which the near-threshold region in the partonic subenergy is important. I summarize the method of "perturbative resummation" and its application to the calculation of the total cross section for top quark production at hadron colliders. Comments are included on the differences between the treatment of subleading logarithmic terms in this method and in other approaches. |
hep-ph/0108146 | Igor G. Irastorza | I. G. Irastorza, A. Morales, S. Scopel, S. Cebrian | Physics Potential and Prospects for CUORE and CUORICINO experiments | 30 pages, 5 figures, substantial changes in text and figures with
respect to previous version | null | null | null | hep-ph astro-ph | null | The CUORE (Cryogenic Underground Observatory for Rare Events) experiment
projects to construct and operate an array of 1000 cryogenic thermal detectors
of a mass of 760 g each to investigate rare events physics, in particular,
double beta decay and non baryonic particle dark matter. A first step towards
CUORE is CUORICINO, an array of 56 of such bolometers, currently being
installed in the Gran Sasso. In this paper we report the physics potential of
both stages of the experiment regarding neutrinoless double beta decay of
130Te, WIMP searches and solar axions.
| [
{
"created": "Fri, 17 Aug 2001 17:39:15 GMT",
"version": "v1"
},
{
"created": "Fri, 31 Aug 2001 17:01:11 GMT",
"version": "v2"
},
{
"created": "Mon, 17 Jun 2002 17:15:35 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Irastorza",
"I. G.",
""
],
[
"Morales",
"A.",
""
],
[
"Scopel",
"S.",
""
],
[
"Cebrian",
"S.",
""
]
] | The CUORE (Cryogenic Underground Observatory for Rare Events) experiment projects to construct and operate an array of 1000 cryogenic thermal detectors of a mass of 760 g each to investigate rare events physics, in particular, double beta decay and non baryonic particle dark matter. A first step towards CUORE is CUORICINO, an array of 56 of such bolometers, currently being installed in the Gran Sasso. In this paper we report the physics potential of both stages of the experiment regarding neutrinoless double beta decay of 130Te, WIMP searches and solar axions. |
hep-ph/9608457 | Sean Fleming | Sean Fleming (University of Wisconsin) | NRQCD Prediction for the Polarization of the J/psi Produced from b-decay | Talk presented at DPF96 Minneapolis. This file needs sprocl.sty,
which can be accessed at http://www.hep.umn.edu/dpf96/ | null | null | MADPH-96-959 | hep-ph | null | Presented at the Meeting of the Division of Particles and Fields, August
1996, in Minneapolis. The work presented here is based upon a recent paper
(hep-ph/9608413) done in collaboration with Oscar F. Hernandez, Ivan Maksymyk,
and Helene Nadeau. The NRQCD predictions for the polarization of the J/psi
produced in b->J/psi+X, as well as the helicity-summed production rate are
presented.
| [
{
"created": "Tue, 27 Aug 1996 23:18:29 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Fleming",
"Sean",
"",
"University of Wisconsin"
]
] | Presented at the Meeting of the Division of Particles and Fields, August 1996, in Minneapolis. The work presented here is based upon a recent paper (hep-ph/9608413) done in collaboration with Oscar F. Hernandez, Ivan Maksymyk, and Helene Nadeau. The NRQCD predictions for the polarization of the J/psi produced in b->J/psi+X, as well as the helicity-summed production rate are presented. |
0708.2907 | Roman Nevzorov | C.D. Froggatt, R. Nevzorov, H.B. Nielsen | Smallness of the cosmological constant and the multiple point principle | Talk given at the 2007 Europhysics Conference on High Energy Physics,
Manchester, England, 19-25 July 2007, CERN preprint number added, references
updated | J.Phys.Conf.Ser.110:072012,2008 | 10.1088/1742-6596/110/7/072012 | CERN-PH-TH/2007-192 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this talk we argue that the breakdown of global symmetries in no--scale
supergravity (SUGRA), which ensures the vanishing of the vacuum energy density
near the physical vacuum, leads to a natural realisation of the multiple point
principle (MPP). In the MPP inspired SUGRA models the cosmological constant is
naturally tiny.
| [
{
"created": "Tue, 21 Aug 2007 19:55:38 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Jun 2008 22:32:17 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Froggatt",
"C. D.",
""
],
[
"Nevzorov",
"R.",
""
],
[
"Nielsen",
"H. B.",
""
]
] | In this talk we argue that the breakdown of global symmetries in no--scale supergravity (SUGRA), which ensures the vanishing of the vacuum energy density near the physical vacuum, leads to a natural realisation of the multiple point principle (MPP). In the MPP inspired SUGRA models the cosmological constant is naturally tiny. |
1112.3026 | Oscar St{\aa}l | S. Heinemeyer, O. St{\aa}l, G. Weiglein | Interpreting the LHC Higgs Search Results in the MSSM | 12 pages, 4 figures. v3: Extended discussion on heavy Higgs case,
agrees with published version | Phys. Lett. B 710 (2012) 201 | 10.1016/j.physletb.2012.02.084 | DESY 11-243 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent results reported by the ATLAS and CMS experiments on the search for a
SM-like Higgs boson both show an excess for a Higgs mass near 125 GeV, which is
mainly driven by the \gamma\gamma\ and ZZ^* decay channels, but also receives
some support from channels with a lower mass resolution. We discuss the
implications of this possible signal within the context of the minimal
supersymmetric Standard Model (MSSM), taking into account previous limits from
Higgs searches at LEP, the Tevatron and the LHC. The consequences for the
remaining MSSM parameter space are investigated. Under the assumption of a
Higgs signal we derive new lower bounds on the tree-level parameters of the
MSSM Higgs sector. We also discuss briefly an alternative interpretation of the
excess in terms of the heavy CP-even Higgs boson, a scenario which is found to
be still viable.
| [
{
"created": "Tue, 13 Dec 2011 20:49:42 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Jan 2012 16:03:02 GMT",
"version": "v2"
},
{
"created": "Tue, 20 Mar 2012 14:12:25 GMT",
"version": "v3"
}
] | 2012-03-21 | [
[
"Heinemeyer",
"S.",
""
],
[
"Stål",
"O.",
""
],
[
"Weiglein",
"G.",
""
]
] | Recent results reported by the ATLAS and CMS experiments on the search for a SM-like Higgs boson both show an excess for a Higgs mass near 125 GeV, which is mainly driven by the \gamma\gamma\ and ZZ^* decay channels, but also receives some support from channels with a lower mass resolution. We discuss the implications of this possible signal within the context of the minimal supersymmetric Standard Model (MSSM), taking into account previous limits from Higgs searches at LEP, the Tevatron and the LHC. The consequences for the remaining MSSM parameter space are investigated. Under the assumption of a Higgs signal we derive new lower bounds on the tree-level parameters of the MSSM Higgs sector. We also discuss briefly an alternative interpretation of the excess in terms of the heavy CP-even Higgs boson, a scenario which is found to be still viable. |
1712.05432 | Constantinos Panagiotakopoulos | C. Panagiotakopoulos | Hybrid Inflation in Quasi-minimal Supergravity with Monotonic
Inflationary Potentia | 10 pages, 10 figures | Phys. Rev. D 97, 043516 (2018) | 10.1103/PhysRevD.97.043516 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show how supersymmetric hybrid inflation with scalar spectral index
$n_{\rm s}\simeq 0.96 - 0.97$ is realized in the context of quasi-minimal
supergravity if we insist that the inflationary potential not exhibit any local
minima. We also address the problem of the initial conditions for both
monotonic and non-monotonic inflationary potentials.
| [
{
"created": "Thu, 14 Dec 2017 19:59:04 GMT",
"version": "v1"
}
] | 2018-02-21 | [
[
"Panagiotakopoulos",
"C.",
""
]
] | We show how supersymmetric hybrid inflation with scalar spectral index $n_{\rm s}\simeq 0.96 - 0.97$ is realized in the context of quasi-minimal supergravity if we insist that the inflationary potential not exhibit any local minima. We also address the problem of the initial conditions for both monotonic and non-monotonic inflationary potentials. |
hep-ph/9804295 | Yuan Feng | Feng Yuan and Kuang-Ta Chao (PKU) | Diffractive $\jpsi$ production through Color-Octet mechanism at hadron
colliders | 9 pages, 3 Postscript figures, discussions and references added and
main results unchanged | Phys.Rev. D58 (1998) 114016 | 10.1103/PhysRevD.58.114016 | PKU-TP-98-21 | hep-ph hep-ex | null | We propose the color-octet mechanism combined with the two gluon exchange
model for the diffractive $J/\psi$ production in hadron collisions. In the
leading logarithmic approximation (LLA) in QCD, we find that the diffractive
$J/\psi$ production rate is related to the off-diagonal gluon density in the
proton and to the nonperturbative color-octet matrix element of $J/\psi$. The
rate is found to be very sensitive to the gluon density at very small values of
$x$ (down to $x=O(10^{-6})$). As a result, this process may provide a wide
window for testing the two-gluon exchange model, and may be particularly useful
in studying the small $x$ physics. And it may also be a golden place to test
the color-octet mechanism proposed by solving the $\psi'(J/\psi)$ surplus
problem at the Tevatron.
| [
{
"created": "Wed, 15 Apr 1998 12:17:42 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Jul 1998 13:30:50 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Yuan",
"Feng",
"",
"PKU"
],
[
"Chao",
"Kuang-Ta",
"",
"PKU"
]
] | We propose the color-octet mechanism combined with the two gluon exchange model for the diffractive $J/\psi$ production in hadron collisions. In the leading logarithmic approximation (LLA) in QCD, we find that the diffractive $J/\psi$ production rate is related to the off-diagonal gluon density in the proton and to the nonperturbative color-octet matrix element of $J/\psi$. The rate is found to be very sensitive to the gluon density at very small values of $x$ (down to $x=O(10^{-6})$). As a result, this process may provide a wide window for testing the two-gluon exchange model, and may be particularly useful in studying the small $x$ physics. And it may also be a golden place to test the color-octet mechanism proposed by solving the $\psi'(J/\psi)$ surplus problem at the Tevatron. |
1012.4600 | Stefan Groote | S. Groote, J.G. K\"orner, B. Meli\'c, S. Prelovsek | A survey of top quark polarization at a polarized linear e^+ e^-
collider | 50 pages, 20 figures | Phys.Rev.D83:054018,2011 | 10.1103/PhysRevD.83.054018 | MZ-TH/10-47 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss in detail top quark polarization in above-threshold (t \bar
t)-production at a polarized linear e^+ e^- collider. We pay particular
attention to the minimization and maximization of the polarization of the top
quark by tuning the longitudinal polarization of the e^+ and e^- beams. The
polarization of the top quark is calculated in full next-to-leading order QCD.
We also discuss the beam polarization dependence of the longitudinal spin-spin
correlations of the top and antitop quark spins.
| [
{
"created": "Tue, 21 Dec 2010 10:53:03 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Mar 2011 09:18:14 GMT",
"version": "v2"
}
] | 2011-03-28 | [
[
"Groote",
"S.",
""
],
[
"Körner",
"J. G.",
""
],
[
"Melić",
"B.",
""
],
[
"Prelovsek",
"S.",
""
]
] | We discuss in detail top quark polarization in above-threshold (t \bar t)-production at a polarized linear e^+ e^- collider. We pay particular attention to the minimization and maximization of the polarization of the top quark by tuning the longitudinal polarization of the e^+ and e^- beams. The polarization of the top quark is calculated in full next-to-leading order QCD. We also discuss the beam polarization dependence of the longitudinal spin-spin correlations of the top and antitop quark spins. |
2207.01101 | Steven Martinez | Richard F. Lebed, Steven R. Martinez | Diabatic Representation of Exotic Hadrons in the Dynamical Diquark Model | 9 pages - Version accepted to Physical Review D | Phys. Rev. D 106, 074007 (2022) | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We apply the diabatic formalism, an extension of the adiabatic approximation
inherent to the Born-Oppenheimer (BO) approach of atomic physics, to the
problem of mixing between exotic multiquark hadrons and their nearby di-hadron
thresholds. The unperturbed BO eigenstates are obtained using the dynamical
diquark model, while the diabatic calculation introduces a mixing potential
between these states and the threshold states. We solve the resulting coupled
Schr\"{o}dinger equations numerically for hidden-charm tetraquarks of both open
and closed strangeness to obtain physical mass eigenvalues, and explore the
di-hadron state content and spatial extent of the eigenstates. As an explicit
example, $X(3872)$ emerges with a dominant $D^0 \bar D^{*0}$ component, but
also contains a considerable diquark-antidiquark component that can contribute
significantly to its radiative decay widths, and this component also generates
a full multiplet of other diquark-based exotic hadrons to be compared with
experiment.
| [
{
"created": "Sun, 3 Jul 2022 18:51:05 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Oct 2022 07:23:17 GMT",
"version": "v2"
}
] | 2022-10-28 | [
[
"Lebed",
"Richard F.",
""
],
[
"Martinez",
"Steven R.",
""
]
] | We apply the diabatic formalism, an extension of the adiabatic approximation inherent to the Born-Oppenheimer (BO) approach of atomic physics, to the problem of mixing between exotic multiquark hadrons and their nearby di-hadron thresholds. The unperturbed BO eigenstates are obtained using the dynamical diquark model, while the diabatic calculation introduces a mixing potential between these states and the threshold states. We solve the resulting coupled Schr\"{o}dinger equations numerically for hidden-charm tetraquarks of both open and closed strangeness to obtain physical mass eigenvalues, and explore the di-hadron state content and spatial extent of the eigenstates. As an explicit example, $X(3872)$ emerges with a dominant $D^0 \bar D^{*0}$ component, but also contains a considerable diquark-antidiquark component that can contribute significantly to its radiative decay widths, and this component also generates a full multiplet of other diquark-based exotic hadrons to be compared with experiment. |
1702.02173 | Kai Schmitz | Valerie Domcke, Kai Schmitz | Unified Model of D-Term Inflation | 5 pages + references, 1 figure. v2: slightly extended discussion,
updated references, matches version published in PRD | Phys. Rev. D 95, 075020 (2017) | 10.1103/PhysRevD.95.075020 | null | hep-ph astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Hybrid inflation, driven by a Fayet-Iliopoulos (FI) D term, is an intriguing
inflationary model. In its usual formulation, it however suffers from several
shortcomings. These pertain to the origin of the FI mass scale, the stability
of scalar fields during inflation, gravitational corrections in supergravity,
as well as to the latest constraints from the cosmic microwave background. We
demonstrate that these issues can be remedied if D-term inflation is realized
in the context of strongly coupled supersymmetric gauge theories. We suppose
that the D term is generated in consequence of dynamical supersymmetry
breaking. Moreover, we assume canonical kinetic terms in the Jordan frame as
well as an approximate shift symmetry along the inflaton direction. This
provides us with a unified picture of D-term inflation and high-scale
supersymmetry breaking. The D term may be associated with a gauged U(1)_B-L, so
that the end of inflation spontaneously breaks B-L in the visible sector.
| [
{
"created": "Tue, 7 Feb 2017 19:24:29 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Jun 2018 16:25:21 GMT",
"version": "v2"
}
] | 2018-06-29 | [
[
"Domcke",
"Valerie",
""
],
[
"Schmitz",
"Kai",
""
]
] | Hybrid inflation, driven by a Fayet-Iliopoulos (FI) D term, is an intriguing inflationary model. In its usual formulation, it however suffers from several shortcomings. These pertain to the origin of the FI mass scale, the stability of scalar fields during inflation, gravitational corrections in supergravity, as well as to the latest constraints from the cosmic microwave background. We demonstrate that these issues can be remedied if D-term inflation is realized in the context of strongly coupled supersymmetric gauge theories. We suppose that the D term is generated in consequence of dynamical supersymmetry breaking. Moreover, we assume canonical kinetic terms in the Jordan frame as well as an approximate shift symmetry along the inflaton direction. This provides us with a unified picture of D-term inflation and high-scale supersymmetry breaking. The D term may be associated with a gauged U(1)_B-L, so that the end of inflation spontaneously breaks B-L in the visible sector. |
hep-ph/0205115 | Jianwei Qiu | Jianwei Qiu (Iowa State) and Xiaofei Zhang (Kent State) | Role of nonperturbative input in QCD resummed heavy boson $Q_T$
distribution | Latex, 4 pages, to be published in the proceedings of XXXVII
Rencontres de Moriond on "QCD and High Energy Hadronic Interactions" | null | null | null | hep-ph | null | We show that role of nonperturbative input in the $b$-space QCD resummation
formalism for heavy boson transverse momentum ($Q_T$) distribution strongly
depends on collision energy $\sqrt{S}$. At collider energies, the larger
$\sqrt{S}$ is, the weaker role nonperturbative input plays, and better
predictive power the $b$-space resummation formalism has.
| [
{
"created": "Sun, 12 May 2002 19:54:15 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Qiu",
"Jianwei",
"",
"Iowa State"
],
[
"Zhang",
"Xiaofei",
"",
"Kent State"
]
] | We show that role of nonperturbative input in the $b$-space QCD resummation formalism for heavy boson transverse momentum ($Q_T$) distribution strongly depends on collision energy $\sqrt{S}$. At collider energies, the larger $\sqrt{S}$ is, the weaker role nonperturbative input plays, and better predictive power the $b$-space resummation formalism has. |
2210.14604 | John Gracey | J.A. Gracey, R.H. Mason | Five loop minimal MOM scheme field and quark mass anomalous dimensions
in QCD | 21 latex pages, anc directory contains txt file with electronic
version of anomalous dimensions for the mini-MOM scheme and their conversion
functions, clarifications and minor changes added | null | 10.1088/1751-8121/acb978 | LTH 1319 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We determine the anomalous dimensions of the gluon, Faddeev-Popov ghost and
quark in the minimal MOM scheme to five loops for a general colour group when
Quantum Chromodynamics is fixed in a linear covariant gauge. The quark mass
anomalous dimension is also constructed in the same scheme.
| [
{
"created": "Wed, 26 Oct 2022 10:22:18 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Feb 2023 15:52:44 GMT",
"version": "v2"
}
] | 2023-03-01 | [
[
"Gracey",
"J. A.",
""
],
[
"Mason",
"R. H.",
""
]
] | We determine the anomalous dimensions of the gluon, Faddeev-Popov ghost and quark in the minimal MOM scheme to five loops for a general colour group when Quantum Chromodynamics is fixed in a linear covariant gauge. The quark mass anomalous dimension is also constructed in the same scheme. |
0801.1937 | Masahiro Inui | Akira Ni\'egawa | Absence of coexisting phase of quark-antiquark and diquark condensed
phases in the extended Gross-Neveu model in $2 + 1$ dimensions | 9 pages | Mod.Phys.Lett.A23:933-942,2008 | 10.1142/S0217732308026960 | null | hep-ph | null | We show that the coexisting phase of quark-antiquark and diquark condensed
phases is absent in the cold quark matter in the $2 + 1$ dimensional extended
Gross-Neveu model, which is in sharp contrast to the case of $3 + 1$
dimensional Nambu--Jona-Lasinio model.
| [
{
"created": "Sun, 13 Jan 2008 06:32:51 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Niégawa",
"Akira",
""
]
] | We show that the coexisting phase of quark-antiquark and diquark condensed phases is absent in the cold quark matter in the $2 + 1$ dimensional extended Gross-Neveu model, which is in sharp contrast to the case of $3 + 1$ dimensional Nambu--Jona-Lasinio model. |
0805.3144 | Magno Machado | M.V.T. Machado | Investigating the exclusive protoproduction of dileptons at high
energies | 6 pages, 4 figures | Phys.Rev.D78:034016,2008 | 10.1103/PhysRevD.78.034016 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the high energy color dipole approach, we study the exclusive
photoproduction of lepton pairs. We use simple models for the elementary
dipole-hadron scattering amplitude that captures main features of the
dependence on atomic number A, on energy and on momentum transfer t. This
investigation is complementary to conventional partonic description of timelike
Compton scattering, which considers quark handbag diagrams at leading order in
$\alpha_s$ and simple models of the relevant generalized parton distributions
(GPDs). These calculations are input in electromagnetic interactions in pp and
AA collisions to measured at the LHC.
| [
{
"created": "Tue, 20 May 2008 19:09:29 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Machado",
"M. V. T.",
""
]
] | Using the high energy color dipole approach, we study the exclusive photoproduction of lepton pairs. We use simple models for the elementary dipole-hadron scattering amplitude that captures main features of the dependence on atomic number A, on energy and on momentum transfer t. This investigation is complementary to conventional partonic description of timelike Compton scattering, which considers quark handbag diagrams at leading order in $\alpha_s$ and simple models of the relevant generalized parton distributions (GPDs). These calculations are input in electromagnetic interactions in pp and AA collisions to measured at the LHC. |
1306.0279 | Zhaoxia Heng | Zhaoxia Heng, Liangliang Shang, Peihua Wan | Pair production of a 125 GeV Higgs boson in MSSM and NMSSM at the ILC | 14 pages, 6 figures | JHEP 1310 (2013) 047 | 10.1007/JHEP10(2013)047 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we investigate the Higgs pair production in the MSSM and NMSSM
at the photon-photon collision of the ILC. We consider various experimental
constraints and scan over the parameter space of the MSSM and NMSSM. Then we
calculate the cross section of Higgs pair production in the allowed parameter
space and compare the results with the predictions in the SM. We find that the
large enhancement of the cross section in the MSSM is mainly due to the
contributions from the loops mediated by the stau, while in the NMSSM it is
mainly due to the contributions from the top-squark loops. For light
$m_{\tilde{\tau}_1}$ and large $\mu\tan\beta$, the production rate can be
enhanced by a factor of 18 in the MSSM (relative to the SM prediction). And for
a large trilinear soft breaking parameter $A_t$ and a moderately light
top-squark, it can also be enhanced by a factor of 2 in the NMSSM. Moreover, we
also calculate the $\chi^2$ values with the LHC Higgs data and display the
results for the parameter space with $\chi^2$ better than the SM value.
| [
{
"created": "Mon, 3 Jun 2013 03:00:19 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Jun 2013 03:22:55 GMT",
"version": "v2"
},
{
"created": "Wed, 9 Oct 2013 07:45:39 GMT",
"version": "v3"
}
] | 2013-10-10 | [
[
"Heng",
"Zhaoxia",
""
],
[
"Shang",
"Liangliang",
""
],
[
"Wan",
"Peihua",
""
]
] | In this work we investigate the Higgs pair production in the MSSM and NMSSM at the photon-photon collision of the ILC. We consider various experimental constraints and scan over the parameter space of the MSSM and NMSSM. Then we calculate the cross section of Higgs pair production in the allowed parameter space and compare the results with the predictions in the SM. We find that the large enhancement of the cross section in the MSSM is mainly due to the contributions from the loops mediated by the stau, while in the NMSSM it is mainly due to the contributions from the top-squark loops. For light $m_{\tilde{\tau}_1}$ and large $\mu\tan\beta$, the production rate can be enhanced by a factor of 18 in the MSSM (relative to the SM prediction). And for a large trilinear soft breaking parameter $A_t$ and a moderately light top-squark, it can also be enhanced by a factor of 2 in the NMSSM. Moreover, we also calculate the $\chi^2$ values with the LHC Higgs data and display the results for the parameter space with $\chi^2$ better than the SM value. |
1207.6869 | Ilkka Helenius | Ilkka Helenius, Kari J. Eskola, Heli Honkanen, Carlos A. Salgado | Modeling the Impact Parameter Dependence of the nPDFs With EKS98 and
EPS09 Global Fits | 4 pages, 4 figures, Talk given at Hard Probes 2012, 27 May - 1 June,
2012, Cagliari (Sardinia, Italy). V2: Added one comment | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | So far the nuclear PDFs (nPDFs) in the global DGLAP fits have been taken to
be spatially independent. In this work, using the $A$-dependence of the
globally fitted sets EPS09 and EKS98, we have determined the spatial dependence
of the nPDFs in terms of powers of the nuclear thickness functions. New
spatially dependent nPDF sets EPS09s (NLO, LO, error sets) and EKS98s (LO) are
released. As an application, we consider the nuclear modification factor
$R_{dAu}^{\pi^0}$ at midrapidity for neutral pion production in deuteron-gold
collisions at RHIC in NLO. Comparison with the PHENIX data in different
centrality classes is also shown. In addition, predictions for the
corresponding nuclear modification factor $R_{pPb}^{\pi^0}$ in proton-lead
collisions at the LHC are discussed.
| [
{
"created": "Mon, 30 Jul 2012 08:59:22 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Oct 2012 13:44:26 GMT",
"version": "v2"
}
] | 2012-10-05 | [
[
"Helenius",
"Ilkka",
""
],
[
"Eskola",
"Kari J.",
""
],
[
"Honkanen",
"Heli",
""
],
[
"Salgado",
"Carlos A.",
""
]
] | So far the nuclear PDFs (nPDFs) in the global DGLAP fits have been taken to be spatially independent. In this work, using the $A$-dependence of the globally fitted sets EPS09 and EKS98, we have determined the spatial dependence of the nPDFs in terms of powers of the nuclear thickness functions. New spatially dependent nPDF sets EPS09s (NLO, LO, error sets) and EKS98s (LO) are released. As an application, we consider the nuclear modification factor $R_{dAu}^{\pi^0}$ at midrapidity for neutral pion production in deuteron-gold collisions at RHIC in NLO. Comparison with the PHENIX data in different centrality classes is also shown. In addition, predictions for the corresponding nuclear modification factor $R_{pPb}^{\pi^0}$ in proton-lead collisions at the LHC are discussed. |
0709.2965 | Ryo Takahasi | Ryo Takahashi and Morimitsu Tanimoto | False Vacuum in the Supersymmetric Mass Varying Neutrinos Model | 7 pages, 5 figures, revtex, typos corrected | Phys.Rev.D77:045015,2008 | 10.1103/PhysRevD.77.045015 | null | hep-ph | null | We present detailed analyses of the vacuum structure of the scalar potential
in a supersymmetric Mass Varying Neutrinos model. The observed dark energy
density is identified with false vacuum energy and the dark energy scale of
order $(10^{-3}eV)^4$ is understood by gravitationally suppressed supersymmetry
breaking scale, $F({TeV})^2/M_{Pl}$, in the model. The vacuum expectation
values of sneutrinos should be tiny in order that the model works. Some decay
processes of superparticles into acceleron and sterile neutrino are also
discussed in the model.
| [
{
"created": "Wed, 19 Sep 2007 07:46:44 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Sep 2007 06:37:41 GMT",
"version": "v2"
},
{
"created": "Sun, 4 Nov 2007 11:44:35 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Takahashi",
"Ryo",
""
],
[
"Tanimoto",
"Morimitsu",
""
]
] | We present detailed analyses of the vacuum structure of the scalar potential in a supersymmetric Mass Varying Neutrinos model. The observed dark energy density is identified with false vacuum energy and the dark energy scale of order $(10^{-3}eV)^4$ is understood by gravitationally suppressed supersymmetry breaking scale, $F({TeV})^2/M_{Pl}$, in the model. The vacuum expectation values of sneutrinos should be tiny in order that the model works. Some decay processes of superparticles into acceleron and sterile neutrino are also discussed in the model. |
hep-ph/0107277 | Petr Vogel | Carlo Bemporad, Giorgio Gratta, and Petr Vogel | Reactor-based Neutrino Oscillation Experiments | Submitted to Reviews of Modern Physics 34 pages, 39 figures | Rev.Mod.Phys.74:297,2002 | 10.1103/RevModPhys.74.297 | null | hep-ph hep-ex nucl-th | null | The status of neutrino oscillation searches employing nuclear reactors as
sources is reviewed. This technique, a direct continuation of the experiments
that proved the existence of neutrinos, is today an essential tool in
investigating the indications of oscillations found in studying neutrinos
produced in the sun and in the earth's atmosphere. The low-energy of the
reactor \nuebar makes them an ideal tool to explore oscillations with small
mass differences and relatively large mixing angles.
In the last several years the determination of the reactor anti-neutrino flux
and spectrum has reached a high degree of accuracy. Hence measurements of these
quantities at a given distance L can be readily compared with the expectation
at L = 0, thus testing \nuebar disappearance.
While two experiments, Chooz and Palo Verde, with baselines of about 1 km and
thus sensitive to the neutrino mass differences associated with the atmospheric
neutrino anomaly, have collected data and published results recently, an
ambitious project with a baseline of more than 100 km, Kamland, is preparing to
take data. This ultimate reactor experiment will have a sensitivity sufficient
to explore part of the oscillation phase space relevant to solar neutrino
scenarios. It is the only envisioned experiment with a terrestrial source of
neutrinos capable of addressing the solar neutrino puzzle.
| [
{
"created": "Thu, 26 Jul 2001 16:46:43 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Bemporad",
"Carlo",
""
],
[
"Gratta",
"Giorgio",
""
],
[
"Vogel",
"Petr",
""
]
] | The status of neutrino oscillation searches employing nuclear reactors as sources is reviewed. This technique, a direct continuation of the experiments that proved the existence of neutrinos, is today an essential tool in investigating the indications of oscillations found in studying neutrinos produced in the sun and in the earth's atmosphere. The low-energy of the reactor \nuebar makes them an ideal tool to explore oscillations with small mass differences and relatively large mixing angles. In the last several years the determination of the reactor anti-neutrino flux and spectrum has reached a high degree of accuracy. Hence measurements of these quantities at a given distance L can be readily compared with the expectation at L = 0, thus testing \nuebar disappearance. While two experiments, Chooz and Palo Verde, with baselines of about 1 km and thus sensitive to the neutrino mass differences associated with the atmospheric neutrino anomaly, have collected data and published results recently, an ambitious project with a baseline of more than 100 km, Kamland, is preparing to take data. This ultimate reactor experiment will have a sensitivity sufficient to explore part of the oscillation phase space relevant to solar neutrino scenarios. It is the only envisioned experiment with a terrestrial source of neutrinos capable of addressing the solar neutrino puzzle. |
1312.7488 | Kamakshya Modak | Kamakshya Prasad Modak, Debasish Majumdar, Subhendu Rakshit | A Possible Explanation of Low Energy $\gamma$-ray Excess from Galactic
Centre and Fermi Bubble by a Dark Matter Model with Two Real Scalars | 43 Pages, 14 Figures and 5 Tables; text and reference modified | null | 10.1088/1475-7516/2015/03/011 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We promote the idea of multi-component Dark Matter (DM) to explain results
from both direct and indirect detection experiments. In these models as
contribution of each DM candidate to relic abundance is summed up to meet
WMAP/Planck measurements of $\Omega_{\rm DM}$, these candidates have larger
annihilation cross-sections compared to the single-component DM models. This
results in larger $\gamma$-ray flux in indirect detection experiments of DM. We
illustrate this fact by introducing an extra scalar to the popular single real
scalar DM model. We also present detailed calculations for the vacuum stability
bounds, perturbative unitarity and triviality constraints on this model. As
direct detection experimental results still show some conflict, we kept our
options open, discussing different scenarios with different DM mass zones. In
the framework of our model we make an interesting observation: The existing
direct detection experiments like CDMS II, CoGeNT, CRESST II, XENON 100 or LUX
together with the observation of excess low energy $\gamma$-ray from Galactic
Centre and Fermi Bubble by FGST already have the capability to distinguish
between different DM halo profiles.
| [
{
"created": "Sun, 29 Dec 2013 01:54:55 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Mar 2014 10:28:27 GMT",
"version": "v2"
}
] | 2015-06-18 | [
[
"Modak",
"Kamakshya Prasad",
""
],
[
"Majumdar",
"Debasish",
""
],
[
"Rakshit",
"Subhendu",
""
]
] | We promote the idea of multi-component Dark Matter (DM) to explain results from both direct and indirect detection experiments. In these models as contribution of each DM candidate to relic abundance is summed up to meet WMAP/Planck measurements of $\Omega_{\rm DM}$, these candidates have larger annihilation cross-sections compared to the single-component DM models. This results in larger $\gamma$-ray flux in indirect detection experiments of DM. We illustrate this fact by introducing an extra scalar to the popular single real scalar DM model. We also present detailed calculations for the vacuum stability bounds, perturbative unitarity and triviality constraints on this model. As direct detection experimental results still show some conflict, we kept our options open, discussing different scenarios with different DM mass zones. In the framework of our model we make an interesting observation: The existing direct detection experiments like CDMS II, CoGeNT, CRESST II, XENON 100 or LUX together with the observation of excess low energy $\gamma$-ray from Galactic Centre and Fermi Bubble by FGST already have the capability to distinguish between different DM halo profiles. |
1703.08011 | Avik Banerjee | Avik Banerjee, Gautam Bhattacharyya, Tirtha Sankar Ray | Improving Fine-tuning in Composite Higgs Models | 23 pages, 12 figures (pdf), Further clarifications added in text,
references updated, matches published version | Phys. Rev. D 96, 035040 (2017) | 10.1103/PhysRevD.96.035040 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we investigate the next-to-minimal composite Higgs model with a
SO(6)/SO(5) coset, whose pNGB sector includes a Standard Model singlet in
addition to the usual Higgs doublet. The fermions are embedded in the
representation 6 of SO(6). We study the region of parameter space of the model
where the radiatively generated potential has global minima with both the
doublet and the singlet fields developing vacuum expectation values. We
investigate the consequences of kinetic and mass mixing between the Higgs and
the singlet scalar that arise in this framework. We demonstrate that the
ensuing doublet-singlet mixing can provide a handle to accommodate heavier
resonances (top-partners) for a given compositeness scale as compared to the
minimal composite Higgs model, thus relaxing the tension with the direct LHC
bounds. The main phenomenological consequence of this is a sizable deviation of
the Higgs couplings from the Standard Model predictions. While the present
experimental precision in the measurement of the Higgs couplings still allows
for considerable release of this tension, future measurements of the Higgs
branching ratios with increased precision would lead to stringent constraints
on this setup.
| [
{
"created": "Thu, 23 Mar 2017 11:33:51 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Jun 2017 07:13:35 GMT",
"version": "v2"
},
{
"created": "Thu, 31 Aug 2017 16:31:19 GMT",
"version": "v3"
}
] | 2017-09-01 | [
[
"Banerjee",
"Avik",
""
],
[
"Bhattacharyya",
"Gautam",
""
],
[
"Ray",
"Tirtha Sankar",
""
]
] | In this paper we investigate the next-to-minimal composite Higgs model with a SO(6)/SO(5) coset, whose pNGB sector includes a Standard Model singlet in addition to the usual Higgs doublet. The fermions are embedded in the representation 6 of SO(6). We study the region of parameter space of the model where the radiatively generated potential has global minima with both the doublet and the singlet fields developing vacuum expectation values. We investigate the consequences of kinetic and mass mixing between the Higgs and the singlet scalar that arise in this framework. We demonstrate that the ensuing doublet-singlet mixing can provide a handle to accommodate heavier resonances (top-partners) for a given compositeness scale as compared to the minimal composite Higgs model, thus relaxing the tension with the direct LHC bounds. The main phenomenological consequence of this is a sizable deviation of the Higgs couplings from the Standard Model predictions. While the present experimental precision in the measurement of the Higgs couplings still allows for considerable release of this tension, future measurements of the Higgs branching ratios with increased precision would lead to stringent constraints on this setup. |
1006.4863 | Gabriel Sanchez-Colon | S. Chaturvedi, V. Gupta, G. S\'anchez-Col\'on, and N. Mukunda | Recursive parametrization of Quark flavour mixing matrices | null | Rev. Mex. Fis. 57 (2011) 146-153 | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine quark flavour mixing matrices for three and four generations using
the recursive parametrization of $U(n)$ and $SU(n)$ matrices developed by some
of us in Refs.[2] and [3]. After a brief summary of the recursive
parametrization, we obtain expressions for the independent rephasing invariants
and also the constraints on them that arise from the requirement of mod
symmetry of the flavour mixing matrix.
| [
{
"created": "Thu, 24 Jun 2010 19:28:14 GMT",
"version": "v1"
}
] | 2013-04-04 | [
[
"Chaturvedi",
"S.",
""
],
[
"Gupta",
"V.",
""
],
[
"Sánchez-Colón",
"G.",
""
],
[
"Mukunda",
"N.",
""
]
] | We examine quark flavour mixing matrices for three and four generations using the recursive parametrization of $U(n)$ and $SU(n)$ matrices developed by some of us in Refs.[2] and [3]. After a brief summary of the recursive parametrization, we obtain expressions for the independent rephasing invariants and also the constraints on them that arise from the requirement of mod symmetry of the flavour mixing matrix. |
2109.13823 | Enrico Morgante | Enrico Morgante, Wolfram Ratzinger, Ryosuke Sato, Ben A. Stefanek | Axion Fragmentation on the Lattice | 27 pages + appendices | null | 10.1007/JHEP12(2021)037 | MITP-21-045 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the phenomenon of axion fragmentation when an axion field rolls
over many oscillations of a periodic potential. This is particularly relevant
for the case of relaxion, in which fragmentation provides the necessary energy
dissipation to stop the field evolution. We compare the results of a linear
analysis with the ones obtained from a classical lattice simulation, finding an
agreement in the stopping time of the zero mode between the two within an
${\cal O}(1)$ difference. We finally speculate on the generation of bubbles
with different VEVs of the axion field, and discuss their cosmological
consequences.
| [
{
"created": "Tue, 28 Sep 2021 15:50:55 GMT",
"version": "v1"
}
] | 2021-12-22 | [
[
"Morgante",
"Enrico",
""
],
[
"Ratzinger",
"Wolfram",
""
],
[
"Sato",
"Ryosuke",
""
],
[
"Stefanek",
"Ben A.",
""
]
] | We analyze the phenomenon of axion fragmentation when an axion field rolls over many oscillations of a periodic potential. This is particularly relevant for the case of relaxion, in which fragmentation provides the necessary energy dissipation to stop the field evolution. We compare the results of a linear analysis with the ones obtained from a classical lattice simulation, finding an agreement in the stopping time of the zero mode between the two within an ${\cal O}(1)$ difference. We finally speculate on the generation of bubbles with different VEVs of the axion field, and discuss their cosmological consequences. |
1112.3007 | Christoph Englert | Christoph Englert, Tilman Plehn, Michael Rauch, Dirk Zerwas, Peter M.
Zerwas | LHC: Standard Higgs and Hidden Higgs | 7 pages, 3 figures; references added; final version accepted for
publication in PLB | null | 10.1016/j.physletb.2011.12.067 | IPPP/11/81; DCPT/11/162; KA-TP-39-2011; SFB/CPP-11-77 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Interpretations of Higgs searches critically involve production cross
sections and decay probabilities for different analysis channels. Mixing
effects can reduce production rates, while invisible decays can reduce decay
probabilities. Both effects can transparently be quantified in Higgs systems
where a visible Higgs boson is mixed with a hidden sector Higgs boson. Recent
experimental exclusion bounds can be re-interpreted in this context as a sign
for non-standard Higgs properties. Should a light Higgs boson be discovered,
then our analysis will quantify how closely it may coincide with the Standard
Model.
| [
{
"created": "Tue, 13 Dec 2011 19:52:20 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Jan 2012 10:06:51 GMT",
"version": "v2"
}
] | 2015-06-03 | [
[
"Englert",
"Christoph",
""
],
[
"Plehn",
"Tilman",
""
],
[
"Rauch",
"Michael",
""
],
[
"Zerwas",
"Dirk",
""
],
[
"Zerwas",
"Peter M.",
""
]
] | Interpretations of Higgs searches critically involve production cross sections and decay probabilities for different analysis channels. Mixing effects can reduce production rates, while invisible decays can reduce decay probabilities. Both effects can transparently be quantified in Higgs systems where a visible Higgs boson is mixed with a hidden sector Higgs boson. Recent experimental exclusion bounds can be re-interpreted in this context as a sign for non-standard Higgs properties. Should a light Higgs boson be discovered, then our analysis will quantify how closely it may coincide with the Standard Model. |
hep-ph/9411216 | Jean Marc Richard | Jean-Marc Richard (Grenoble) | Tests of flavour independence in heavy quark potential models | QCD94 Workshop, Montpellier, Latex | Nucl.Phys.Proc.Suppl.39BC:441-445,1995 | 10.1016/0920-5632(95)00115-P | ISN-94-126 | hep-ph | null | We review some rigourous consequences of flavour independence on the spectrum
and properties of hadrons in potential models, with emphasis on hadrons with
two heavy quarks, such as $(b\bar c)$ mesons and $(QQq)$ baryons.
| [
{
"created": "Thu, 3 Nov 1994 13:37:27 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Richard",
"Jean-Marc",
"",
"Grenoble"
]
] | We review some rigourous consequences of flavour independence on the spectrum and properties of hadrons in potential models, with emphasis on hadrons with two heavy quarks, such as $(b\bar c)$ mesons and $(QQq)$ baryons. |
hep-ph/0410047 | Antonio Pineda | Nora Brambilla, Antonio Pineda, Joan Soto and Antonio Vairo | Effective field theories for heavy quarkonium | 162 pages, 30 figures, revised version, references added. Accepted
for publication in Reviews of Modern Physics | Rev.Mod.Phys.77:1423,2005 | 10.1103/RevModPhys.77.1423 | IFUM-805-FT, UB-ECM-PF-04-24 | hep-ph hep-lat nucl-th | null | We review recent theoretical developments in heavy quarkonium physics from
the point of view of Effective Field Theories of QCD. We discuss
Non-Relativistic QCD and concentrate on potential Non-Relativistic QCD. Our
main goal will be to derive QCD Schr\"odinger-like equations that govern the
heavy quarkonium physics in the weak and strong coupling regime. We also
discuss a selected set of applications, which include spectroscopy, inclusive
decays and electromagnetic threshold production.
| [
{
"created": "Mon, 4 Oct 2004 08:23:56 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Apr 2005 08:16:54 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Brambilla",
"Nora",
""
],
[
"Pineda",
"Antonio",
""
],
[
"Soto",
"Joan",
""
],
[
"Vairo",
"Antonio",
""
]
] | We review recent theoretical developments in heavy quarkonium physics from the point of view of Effective Field Theories of QCD. We discuss Non-Relativistic QCD and concentrate on potential Non-Relativistic QCD. Our main goal will be to derive QCD Schr\"odinger-like equations that govern the heavy quarkonium physics in the weak and strong coupling regime. We also discuss a selected set of applications, which include spectroscopy, inclusive decays and electromagnetic threshold production. |
hep-ph/0503290 | Ting T. Wang | Durmus A. Demir, Gordon L. Kane, Ting T. Wang | The minimal U(1)' extension of the MSSM | 28 pages, no figures. References added | Phys.Rev. D72 (2005) 015012 | 10.1103/PhysRevD.72.015012 | null | hep-ph hep-th | null | Motivated by the apparent need for extending the MSSM and perhaps mitigating
naturalness problems associated with the $\mu$ parameter and fine-tuning of the
soft masses, we augment the MSSM spectrum by a SM gauge singlet chiral
superfield, and enlarge the gauge structure by an additional U(1)' invariance,
so that the gauge and Higgs sectors are relatively secluded. One crucial aspect
of U(1)' models is the existence of anomalies, cancellation of which may
require the inclusion of exotic matter which in turn disrupts the unification
of the gauge couplings. In this work we pursue the question of canceling the
anomalies with a minimal matter spectrum and no exotics. This can indeed be
realized provided that U(1)' charges are family-dependent and the soft-breaking
sector includes non-holomorphic operators for generating the fermion masses. We
provide the most general solutions for U(1)' charges by taking into account all
constraints from gauge invariance and anomaly cancellation. We analyze various
laboratory and astrophysical bounds ranging from fermion masses to relic
density, for an illustrative set of parameters. The U(1)' charges admit
patterns of values for which family nonuniversality resides solely in the
lepton sector, though this does not generate leptonic FCNCs due to the U(1)'
gauge invariance.
| [
{
"created": "Wed, 30 Mar 2005 19:36:50 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Sep 2005 21:13:41 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Demir",
"Durmus A.",
""
],
[
"Kane",
"Gordon L.",
""
],
[
"Wang",
"Ting T.",
""
]
] | Motivated by the apparent need for extending the MSSM and perhaps mitigating naturalness problems associated with the $\mu$ parameter and fine-tuning of the soft masses, we augment the MSSM spectrum by a SM gauge singlet chiral superfield, and enlarge the gauge structure by an additional U(1)' invariance, so that the gauge and Higgs sectors are relatively secluded. One crucial aspect of U(1)' models is the existence of anomalies, cancellation of which may require the inclusion of exotic matter which in turn disrupts the unification of the gauge couplings. In this work we pursue the question of canceling the anomalies with a minimal matter spectrum and no exotics. This can indeed be realized provided that U(1)' charges are family-dependent and the soft-breaking sector includes non-holomorphic operators for generating the fermion masses. We provide the most general solutions for U(1)' charges by taking into account all constraints from gauge invariance and anomaly cancellation. We analyze various laboratory and astrophysical bounds ranging from fermion masses to relic density, for an illustrative set of parameters. The U(1)' charges admit patterns of values for which family nonuniversality resides solely in the lepton sector, though this does not generate leptonic FCNCs due to the U(1)' gauge invariance. |
hep-ph/0608331 | Qing-Hong Cao | Qing-Hong Cao and Jose Wudka | Search for new physics via single top production at TeV energy $e\gamma$
colliders | null | Phys.Rev.D74:094015,2006 | 10.1103/PhysRevD.74.094015 | null | hep-ph | null | We study the sensitivity of $ e \gamma$ colliders to physics beyond the
Standard Model, when such interactions are natural and their scale lies below
the collider energy. Using the reaction $ e \gamma \to b t \nu$ as a specific
example, we show that the deviations from the Standard Model can be
parameterized in a model independent way by only 3 numbers. We investigate the
sensitivity of several observables to these 3 quantities, using the various
collider polarization modes to increase the signal to noise ratio. These
results are then translated into the expected sensitivity derived from this
reaction to the new physics effects present in several specific models.
| [
{
"created": "Wed, 30 Aug 2006 23:04:15 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Cao",
"Qing-Hong",
""
],
[
"Wudka",
"Jose",
""
]
] | We study the sensitivity of $ e \gamma$ colliders to physics beyond the Standard Model, when such interactions are natural and their scale lies below the collider energy. Using the reaction $ e \gamma \to b t \nu$ as a specific example, we show that the deviations from the Standard Model can be parameterized in a model independent way by only 3 numbers. We investigate the sensitivity of several observables to these 3 quantities, using the various collider polarization modes to increase the signal to noise ratio. These results are then translated into the expected sensitivity derived from this reaction to the new physics effects present in several specific models. |
hep-ph/9412238 | Andry Grozin | A.G.Grozin | Methods of calculation of higher power corrections in QCD | 27 pages, LaTeX, uses FEYNMAN.tex | Int.J.Mod.Phys.A10:3497-3529,1995 | 10.1142/S0217751X95001674 | OUT-4102-54 | hep-ph | null | Although the methods of calculation of power corrections in QCD sum rules are
well known, algebraic complexity rapidly grows with the increase of vacuum
condensates' dimensions. Currently, state-of-the-art calculations include
dimension 7 and 8 condensates. I summarize and extend algorithms of such
calculations. First, I present all the formulae necessary for application of
the systematic classification of bilinear quark condensates proposed earlier,
and extend this method to the case of gluon condensates. Then I apply these
systematic procedures to expansions of bilinear and noncollinear quark and
gluon condensates in local ones, and of noncollinear condensates in bilocal
ones. The formulae obtained can be used for calculation of correlators
involving nonlocal condensates, and for inventing consistent anzatzs for these
condensates. Finally, I briefly summarize the methods of calculation of heavy-
and light-quark currents' correlators. This paper is aimed both to present new
results on gluon and nonlocal condensates and to be a self-contained handbook
of formulae necessary for calculation of power corrections in QCD sum rules.
| [
{
"created": "Mon, 5 Dec 1994 18:59:14 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Dec 1994 11:23:11 GMT",
"version": "v2"
}
] | 2010-11-01 | [
[
"Grozin",
"A. G.",
""
]
] | Although the methods of calculation of power corrections in QCD sum rules are well known, algebraic complexity rapidly grows with the increase of vacuum condensates' dimensions. Currently, state-of-the-art calculations include dimension 7 and 8 condensates. I summarize and extend algorithms of such calculations. First, I present all the formulae necessary for application of the systematic classification of bilinear quark condensates proposed earlier, and extend this method to the case of gluon condensates. Then I apply these systematic procedures to expansions of bilinear and noncollinear quark and gluon condensates in local ones, and of noncollinear condensates in bilocal ones. The formulae obtained can be used for calculation of correlators involving nonlocal condensates, and for inventing consistent anzatzs for these condensates. Finally, I briefly summarize the methods of calculation of heavy- and light-quark currents' correlators. This paper is aimed both to present new results on gluon and nonlocal condensates and to be a self-contained handbook of formulae necessary for calculation of power corrections in QCD sum rules. |
0809.3716 | Maria Ubiali Ms | Maria Ubiali | NNPDF1.0 parton set for the LHC | To appear in the proceedings of 14th International QCD Conference
(QCD08), Montpellier, France, 7-12th July 2008 | null | 10.1016/j.nuclphysbps.2008.12.020 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the first NNPDF full set of Parton Distribution Functions from a
comprehensive DIS analysis. This approach, combining a Monte Carlo sampling of
the probability measure in the space of PDFs with the use of neural networks as
interpolating functions, provides a faithful and statistically sound
determination of the uncertainty in parton distributions. The features of the
fit and the results are discussed in details as well as some preliminary
phenomenological analysis
| [
{
"created": "Mon, 22 Sep 2008 14:17:26 GMT",
"version": "v1"
}
] | 2009-11-13 | [
[
"Ubiali",
"Maria",
""
]
] | We present the first NNPDF full set of Parton Distribution Functions from a comprehensive DIS analysis. This approach, combining a Monte Carlo sampling of the probability measure in the space of PDFs with the use of neural networks as interpolating functions, provides a faithful and statistically sound determination of the uncertainty in parton distributions. The features of the fit and the results are discussed in details as well as some preliminary phenomenological analysis |
1612.09345 | Selcuk Bilmis | T.M. Aliev and S. Bilmis | Analysis of radial excitations of octet baryons in QCD sum rules | 13 pages, 4 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the QCD sum rules method, we estimate the mass and residues of the
first radial excitations of octet baryons. The contributions coming from the
ground state baryons are eliminated by constructing the linear combinations of
the sum rules corresponding to different Lorentz structures. Our predictions of
the masses of the first radial excitations of octet baryons are in good
agreement with the data.
| [
{
"created": "Thu, 29 Dec 2016 23:29:33 GMT",
"version": "v1"
}
] | 2017-01-02 | [
[
"Aliev",
"T. M.",
""
],
[
"Bilmis",
"S.",
""
]
] | Using the QCD sum rules method, we estimate the mass and residues of the first radial excitations of octet baryons. The contributions coming from the ground state baryons are eliminated by constructing the linear combinations of the sum rules corresponding to different Lorentz structures. Our predictions of the masses of the first radial excitations of octet baryons are in good agreement with the data. |
hep-ph/0311237 | Mar Bastero-Gil | M. Bastero-Gil, V. Di Clemente and S. F. King | Preheating curvature perturbations with a coupled curvaton | 32 pages, 8 figures | Phys.Rev. D70 (2004) 023501 | 10.1103/PhysRevD.70.023501 | null | hep-ph | null | We discuss the potentially important role played by preheating in certain
variants of the curvaton mechanism in which isocurvature perturbations of a
D-flat (and F-flat) direction become converted to curvature perturbations
during reheating. We analyse the transition from inflation to reheating in some
detail, including the dynamics of the coupled curvaton and inflation fields
during this transition. We discover that preheating could be an important
source of adiabaticity where parametric resonance of the isocurvature
components amplifies the super-horizon fluctuations by a significant amount. As
an example of these effects we develop a particle physics motivated model which
we recently introduced in which the D-flat direction is identified with the
usual Higgs field. Our new results show that it is possible to achieve the
correct curvature perturbations for initial values of the curvaton fields of
order the weak scale. In this model we show that the prediction for the
spectral index of the final curvature perturbation only depends on the mass of
the curvaton during inflation, where consistency with current observational
data requires the ratio of this mass to the Hubble constant to be < 0.3.
| [
{
"created": "Wed, 19 Nov 2003 10:34:13 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Bastero-Gil",
"M.",
""
],
[
"Di Clemente",
"V.",
""
],
[
"King",
"S. F.",
""
]
] | We discuss the potentially important role played by preheating in certain variants of the curvaton mechanism in which isocurvature perturbations of a D-flat (and F-flat) direction become converted to curvature perturbations during reheating. We analyse the transition from inflation to reheating in some detail, including the dynamics of the coupled curvaton and inflation fields during this transition. We discover that preheating could be an important source of adiabaticity where parametric resonance of the isocurvature components amplifies the super-horizon fluctuations by a significant amount. As an example of these effects we develop a particle physics motivated model which we recently introduced in which the D-flat direction is identified with the usual Higgs field. Our new results show that it is possible to achieve the correct curvature perturbations for initial values of the curvaton fields of order the weak scale. In this model we show that the prediction for the spectral index of the final curvature perturbation only depends on the mass of the curvaton during inflation, where consistency with current observational data requires the ratio of this mass to the Hubble constant to be < 0.3. |
1606.03042 | Gilberto Ramalho | G. Ramalho | Parametrizations of the $\gamma^\ast N \to \Delta(1232)$ quadrupole form
factors and Siegert's theorem | Published version. Extended version with new title. 6 pages, 4
figures | Phys. Rev. D 94, 114001 (2016) | 10.1103/PhysRevD.94.114001 | null | hep-ph hep-lat nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The large $N_c$ limit provides relations that can be used to calculate the
$\gamma^\ast N \to \Delta(1232)$ quadrupole form factors at low and
intermediate $Q^2$ under the assumption of the pion cloud dominance. There are
two limitations in those parametrizations. First, the parametrization of the
Coulomb quadrupole form factor underestimate the low $Q^2$ data. Second, when
extrapolated for the timelike region, the form factors violate Siegert's
theorem by terms of the order $1/N_c^2$. We propose here corrections to the
parametrization of the electric quadrupole form factor, which violate Siegert's
theorem only by terms of the order $1/N_c^4$. Combining the improved large
$N_c$ pion cloud parametrizations with the valence quark contributions based on
a covariant quark model for the quadrupole transition form factors, we obtain
an extrapolation to the timelike region consistent with Siegert's theorem, and
accomplish also a very good description of the data.
| [
{
"created": "Thu, 9 Jun 2016 18:06:42 GMT",
"version": "v1"
},
{
"created": "Sat, 10 Dec 2016 22:20:09 GMT",
"version": "v2"
}
] | 2016-12-13 | [
[
"Ramalho",
"G.",
""
]
] | The large $N_c$ limit provides relations that can be used to calculate the $\gamma^\ast N \to \Delta(1232)$ quadrupole form factors at low and intermediate $Q^2$ under the assumption of the pion cloud dominance. There are two limitations in those parametrizations. First, the parametrization of the Coulomb quadrupole form factor underestimate the low $Q^2$ data. Second, when extrapolated for the timelike region, the form factors violate Siegert's theorem by terms of the order $1/N_c^2$. We propose here corrections to the parametrization of the electric quadrupole form factor, which violate Siegert's theorem only by terms of the order $1/N_c^4$. Combining the improved large $N_c$ pion cloud parametrizations with the valence quark contributions based on a covariant quark model for the quadrupole transition form factors, we obtain an extrapolation to the timelike region consistent with Siegert's theorem, and accomplish also a very good description of the data. |
2304.05863 | Georg Engelhardt | Georg Engelhardt and Amit Bhoonah and W. Vincent Liu | Detecting axion dark matter with Rydberg atoms via induced electric
dipole transitions | 27 pages, including Supplementary Materials. Comments are welcome | null | null | null | hep-ph cond-mat.quant-gas physics.atom-ph | http://creativecommons.org/licenses/by/4.0/ | Long-standing efforts to detect axions are driven by two compelling
prospects, naturally accounting for the absence of charge-conjugation and
parity symmetry breaking in quantum chromodynamics, and for the elusive dark
matter at ultralight mass scale. Many experiments use advanced cavity resonator
setups to probe the magnetic-field-mediated conversion of axions to photons.
Here, we show how to search for axion matter without relying on such a cavity
setup, which opens a new path for the detection of ultralight axions, where
cavity based setups are infeasible. When applied to Rydberg atoms, which
feature particularly large transition dipole elements, this effect promises an
outstanding sensitivity for detecting ultralight dark matter. Our estimates
show that it can provide laboratory constraints in parameter space that so far
had only been probed astrophysically, and cover new unprobed regions of
parameter space. The Rydberg atomic gases offer a flexible and inexpensive
experimental platform that can operate at room temperature. We project the
sensitivity by quantizing the axion-modified Maxwell equations to accurately
describe atoms and molecules as quantum sensors wherever axion dark matter is
present.
| [
{
"created": "Wed, 12 Apr 2023 13:55:51 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Jul 2023 00:31:25 GMT",
"version": "v2"
}
] | 2023-07-19 | [
[
"Engelhardt",
"Georg",
""
],
[
"Bhoonah",
"Amit",
""
],
[
"Liu",
"W. Vincent",
""
]
] | Long-standing efforts to detect axions are driven by two compelling prospects, naturally accounting for the absence of charge-conjugation and parity symmetry breaking in quantum chromodynamics, and for the elusive dark matter at ultralight mass scale. Many experiments use advanced cavity resonator setups to probe the magnetic-field-mediated conversion of axions to photons. Here, we show how to search for axion matter without relying on such a cavity setup, which opens a new path for the detection of ultralight axions, where cavity based setups are infeasible. When applied to Rydberg atoms, which feature particularly large transition dipole elements, this effect promises an outstanding sensitivity for detecting ultralight dark matter. Our estimates show that it can provide laboratory constraints in parameter space that so far had only been probed astrophysically, and cover new unprobed regions of parameter space. The Rydberg atomic gases offer a flexible and inexpensive experimental platform that can operate at room temperature. We project the sensitivity by quantizing the axion-modified Maxwell equations to accurately describe atoms and molecules as quantum sensors wherever axion dark matter is present. |
hep-ph/0406214 | Cliff Burgess | C.P. Burgess | Supersymmetric Large Extra Dimensions | To appear in the proceedings of 39th Rencontres de Moriond on
Electroweak Interactions and Unified Theories, La Thuile, Aosta Valley,
Italy, 21-28 March 2004 | null | null | null | hep-ph | null | This article summarizes the proposal to address the cosmological constant
problem within the framework of supersymmetric large extra dimensions (SLED).
The proposed mechanism is described, emphasizing the relaxation mechanism which
ensures that low-energy particles like the electron do not contribute too large
a vacuum energy. This is followed by a preliminary discussion of outstanding
issues and observational consequences.
| [
{
"created": "Mon, 21 Jun 2004 04:28:31 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Burgess",
"C. P.",
""
]
] | This article summarizes the proposal to address the cosmological constant problem within the framework of supersymmetric large extra dimensions (SLED). The proposed mechanism is described, emphasizing the relaxation mechanism which ensures that low-energy particles like the electron do not contribute too large a vacuum energy. This is followed by a preliminary discussion of outstanding issues and observational consequences. |
hep-ph/0209071 | Tokarev M. V. | G.P. Skoro (1), M.V. Tokarev (2), Yu.A. Panebratsev (2), I. Zborovsky
(3) ((1) Institute of Nuclear Sciences "Vinca", Faculty of Physics,
University of Belgrade, Belgrade, Yugoslavia, (2) Laboratory of High
Energies, Joint Institute for Nuclear Research, Dubna, Moscow region, Russia
(3) Nuclear Physics Institute, Academy of Sciences of the Czech Republic,
Rez, Czech Republic) | Scaling properties of hadron production in pi-p and pi-A collisions at
high-pT | 9 pages, LaTeX, 12 figures, Talk presented at the XVI International
Seminar on High Energy Physics Problems "Relativistic Nuclear Physics and
Quantum Chromodynamics", Dubna, Russia, June 10-15, 2002 | null | null | null | hep-ph | null | Scaling features of particles produced in pi-p and pi-A collisions over a
high-pT range at high energies are studied. The general concept of z-scaling is
applied for the analysis of pi-p and pi-A experimental data on the inclusive
cross section. The scaling function psi(z) and scaling variable z are
constructed and the anomalous dimension delta_pi is found. The A-dependence of
particle production in pion-nucleus collisions is studied. The predictions of
the inclusive cross section of the pi0-mesons produced in pi-A collisions in
the central rapidity range at high energies have been made.
| [
{
"created": "Fri, 6 Sep 2002 10:08:16 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Skoro",
"G. P.",
""
],
[
"Tokarev",
"M. V.",
""
],
[
"Panebratsev",
"Yu. A.",
""
],
[
"Zborovsky",
"I.",
""
]
] | Scaling features of particles produced in pi-p and pi-A collisions over a high-pT range at high energies are studied. The general concept of z-scaling is applied for the analysis of pi-p and pi-A experimental data on the inclusive cross section. The scaling function psi(z) and scaling variable z are constructed and the anomalous dimension delta_pi is found. The A-dependence of particle production in pion-nucleus collisions is studied. The predictions of the inclusive cross section of the pi0-mesons produced in pi-A collisions in the central rapidity range at high energies have been made. |
2210.07422 | Esteban Calzetta | Nahuel Mir\'on Granese, Alejandra Kandus and Esteban Calzetta | Field Theory Approaches to Relativistic Hydrodynamics | Accepted for publication in Entropy, Special Issue on Causal
Relativistic Hydrodynamics for Viscous Fluids | null | 10.3390/e24121790 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Just as non relativistic fluids, oftentimes we find relativistic fluids in
situations where random fluctuations cannot be ignored, thermal and turbulent
fluctuations being the most relevant examples. Because of the theory's inherent
nonlinearity, fluctuations induce deep and complex changes in the dynamics of
the system. The Martin-Siggia-Rose technique is a powerful tool that allows us
to translate the original hydrodynamic problem into a quantum field theory one,
thus taking advantage of the progress in the treatment of quantum fields out of
equilibrium. To demonstrate this technique, we shall consider the thermal
fluctuations of the spin two modes of a relativistic fluid, in a theory where
hydrodynamics is derived by taking moments of the Boltzmann equation under the
relaxation time approximation.
| [
{
"created": "Thu, 13 Oct 2022 23:54:04 GMT",
"version": "v1"
},
{
"created": "Sun, 4 Dec 2022 01:45:41 GMT",
"version": "v2"
}
] | 2022-12-21 | [
[
"Granese",
"Nahuel Mirón",
""
],
[
"Kandus",
"Alejandra",
""
],
[
"Calzetta",
"Esteban",
""
]
] | Just as non relativistic fluids, oftentimes we find relativistic fluids in situations where random fluctuations cannot be ignored, thermal and turbulent fluctuations being the most relevant examples. Because of the theory's inherent nonlinearity, fluctuations induce deep and complex changes in the dynamics of the system. The Martin-Siggia-Rose technique is a powerful tool that allows us to translate the original hydrodynamic problem into a quantum field theory one, thus taking advantage of the progress in the treatment of quantum fields out of equilibrium. To demonstrate this technique, we shall consider the thermal fluctuations of the spin two modes of a relativistic fluid, in a theory where hydrodynamics is derived by taking moments of the Boltzmann equation under the relaxation time approximation. |
0712.3983 | Davor Horvatic | D. Horvatic, D. Klabucar and D. Mekterovic | Unexpectedly small empirical vector strangeness of nucleons realized in
a baryon model | 10 pages, 2 figures, ICTP preprint number: IC2007033 | Fizika B16:89-98,2007 | null | IC2007033 | hep-ph | null | Most of model considerations of the hidden nucleon strangeness, as well as
some preliminary experimental evidence, led to the expectations of relatively
sizeable strange vector form factors of the proton. For example, it seemed that
the contribution of the fluctuating strange quark-antiquark pairs accounts for
as much as one tenth of the proton's magnetic moment. By the same token, baryon
models which failed to produce the "vector strangeness" of the nucleon seemed
disfavored. Recently, however, more accurate measurements and more
sophisticated data analysis, as well as lattice simulations, revealed that the
form factors associated with the vector strangeness of the nucleon are much
smaller than thought previously; in fact, due to the experimental
uncertainties, the measured strange vector-current proton form factors may be
consistent with zero. In the light of that, we re-asses the merit of the baryon
models leading to little or no vector strangeness of the nucleon. It is done on
the concrete example of the baryon model which essentially amounts to the MIT
bag enriched by the diluted instanton liquid.
| [
{
"created": "Mon, 24 Dec 2007 15:28:33 GMT",
"version": "v1"
}
] | 2009-12-15 | [
[
"Horvatic",
"D.",
""
],
[
"Klabucar",
"D.",
""
],
[
"Mekterovic",
"D.",
""
]
] | Most of model considerations of the hidden nucleon strangeness, as well as some preliminary experimental evidence, led to the expectations of relatively sizeable strange vector form factors of the proton. For example, it seemed that the contribution of the fluctuating strange quark-antiquark pairs accounts for as much as one tenth of the proton's magnetic moment. By the same token, baryon models which failed to produce the "vector strangeness" of the nucleon seemed disfavored. Recently, however, more accurate measurements and more sophisticated data analysis, as well as lattice simulations, revealed that the form factors associated with the vector strangeness of the nucleon are much smaller than thought previously; in fact, due to the experimental uncertainties, the measured strange vector-current proton form factors may be consistent with zero. In the light of that, we re-asses the merit of the baryon models leading to little or no vector strangeness of the nucleon. It is done on the concrete example of the baryon model which essentially amounts to the MIT bag enriched by the diluted instanton liquid. |
1008.0579 | Kathlynne Tullney Joy | K. Tullney (1), C. Gemmel (1), W. Heil (1), S. Karpuk (1), K. Lenz
(1), Yu. Sobolev (1), M. Burghoff (2), W. Kilian (2), S. Knappe-Gr\"uneberg
(2), W. M\"uller (2), A. Schnabel (2), F. Seifert (2), L. Trahms (2), U.
Schmidt (3) ((1) Institut f\"ur Physik, Mainz, Germany, (2) Physikalisch
Technische Bundesanstalt, Berlin, Germany, (3) Physikalisches Instiut,
Heidelberg, Germany) | Test of Lorentz Symmetry by using a 3He/129Xe Co-Magnetometer | Presented at the Fifth Meeting on CPT and Lorentz Symmetry,
Bloomington, Indiana, June 28 - July 2, 2010 | null | 10.1142/9789814327688_0042 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | To test Lorentz symmetry we used a 3He/129Xe co-magnetometer. We will give a
short summary of our experimental setup and the results of our latest
measurements. We obtained preliminary results for the equatorial component of
the background field interacting with the spin of the bound neutron: b_n < 3.72
x 10^(-32) GeV (95 C.L.).
| [
{
"created": "Tue, 3 Aug 2010 15:34:08 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Tullney",
"K.",
""
],
[
"Gemmel",
"C.",
""
],
[
"Heil",
"W.",
""
],
[
"Karpuk",
"S.",
""
],
[
"Lenz",
"K.",
""
],
[
"Sobolev",
"Yu.",
""
],
[
"Burghoff",
"M.",
""
],
[
"Kilian",
"W.",
""
... | To test Lorentz symmetry we used a 3He/129Xe co-magnetometer. We will give a short summary of our experimental setup and the results of our latest measurements. We obtained preliminary results for the equatorial component of the background field interacting with the spin of the bound neutron: b_n < 3.72 x 10^(-32) GeV (95 C.L.). |
0807.0515 | Bastian Kubis | M. Bissegger, A. Fuhrer, J. Gasser, B. Kubis, A. Rusetsky | Radiative corrections in K --> 3 pi decays | 57 pages, 17 figures | Nucl.Phys.B806:178-223,2009 | 10.1016/j.nuclphysb.2008.07.027 | HISKP-TH-08/10 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate radiative corrections to K --> 3 pi decays. In particular, we
extend the non-relativistic framework developed recently to include real and
virtual photons and show that, in a well-defined power counting scheme, the
results reproduce corrections obtained in the relativistic calculation. Real
photons are included exactly, beyond the soft-photon approximation, and we
compare the result with the latter. The singularities generated by pionium near
threshold are investigated, and a region is identified where standard
perturbation theory in the fine structure constant alpha may be applied. We
expect that the formulae provided allow one to extract S-wave pi pi scattering
lengths from the cusp effect in these decays with high precision.
| [
{
"created": "Thu, 3 Jul 2008 09:27:20 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Bissegger",
"M.",
""
],
[
"Fuhrer",
"A.",
""
],
[
"Gasser",
"J.",
""
],
[
"Kubis",
"B.",
""
],
[
"Rusetsky",
"A.",
""
]
] | We investigate radiative corrections to K --> 3 pi decays. In particular, we extend the non-relativistic framework developed recently to include real and virtual photons and show that, in a well-defined power counting scheme, the results reproduce corrections obtained in the relativistic calculation. Real photons are included exactly, beyond the soft-photon approximation, and we compare the result with the latter. The singularities generated by pionium near threshold are investigated, and a region is identified where standard perturbation theory in the fine structure constant alpha may be applied. We expect that the formulae provided allow one to extract S-wave pi pi scattering lengths from the cusp effect in these decays with high precision. |
hep-ph/0205295 | Kei-ichi Kimura | Keiichi Kimura, Akira Takamura and Hidekazu Yokomakura | Exact Formulas and Simple CP dependence of Neutrino Oscillation
Probabilities in Matter with Constant Density | 12 pages, RevTeX4 style, changed title, minor corrections | Phys.Rev. D66 (2002) 073005 | 10.1103/PhysRevD.66.073005 | DPNU-02-14 | hep-ph | null | We investigate neutrino oscillations in constant matter within the context of
the standard three neutrino scenario. We derive an exact and simple formula for
the oscillation probability applicable to all channels. In the standard
parametrization, the probability for $\nu_e$ $\to$ $\nu_{\mu}$ transition can
be written in the form $P(\nu_e \to
\nu_{\mu})=A_{e\mu}\cos\delta+B_{e\mu}\sin\delta+C_{e\mu}$ without any
approximation using CP phase $\delta$. For $\nu_{\mu}$ $\to$ $\nu_{\tau}$
transition, the linear term of $\cos 2\delta$ is added and the probability can
be written in the form $P(\nu_{\mu} \to
\nu_{\tau})=A_{\mu\tau}\cos\delta+B_{\mu\tau}
\sin\delta+C_{\mu\tau}+D_{\mu\tau}\cos 2\delta$. We give the CP dependences of
the probability for other channels. We show that the probability for each
channel in matter has the same form with respect to $\delta$ as in vacuum. It
means that matter effects just modify the coefficients $A$, $B$, $C$ and $D$.
We also give the exact expression of the coefficients for each channel.
Furthermore, we show that our results with respect to CP dependences are
reproduced from the effective mixing angles and the effective CP phase
calculated by Zaglauer and Schwarzer. Through the calculation, a new identity
is obtained by dividing the Naumov-Harrison-Scott identity by the Toshev
identity.
| [
{
"created": "Sun, 26 May 2002 15:05:24 GMT",
"version": "v1"
},
{
"created": "Sun, 16 Jun 2002 12:34:38 GMT",
"version": "v2"
},
{
"created": "Sun, 25 Aug 2002 11:20:46 GMT",
"version": "v3"
},
{
"created": "Sun, 1 Sep 2002 07:29:07 GMT",
"version": "v4"
}
] | 2009-11-07 | [
[
"Kimura",
"Keiichi",
""
],
[
"Takamura",
"Akira",
""
],
[
"Yokomakura",
"Hidekazu",
""
]
] | We investigate neutrino oscillations in constant matter within the context of the standard three neutrino scenario. We derive an exact and simple formula for the oscillation probability applicable to all channels. In the standard parametrization, the probability for $\nu_e$ $\to$ $\nu_{\mu}$ transition can be written in the form $P(\nu_e \to \nu_{\mu})=A_{e\mu}\cos\delta+B_{e\mu}\sin\delta+C_{e\mu}$ without any approximation using CP phase $\delta$. For $\nu_{\mu}$ $\to$ $\nu_{\tau}$ transition, the linear term of $\cos 2\delta$ is added and the probability can be written in the form $P(\nu_{\mu} \to \nu_{\tau})=A_{\mu\tau}\cos\delta+B_{\mu\tau} \sin\delta+C_{\mu\tau}+D_{\mu\tau}\cos 2\delta$. We give the CP dependences of the probability for other channels. We show that the probability for each channel in matter has the same form with respect to $\delta$ as in vacuum. It means that matter effects just modify the coefficients $A$, $B$, $C$ and $D$. We also give the exact expression of the coefficients for each channel. Furthermore, we show that our results with respect to CP dependences are reproduced from the effective mixing angles and the effective CP phase calculated by Zaglauer and Schwarzer. Through the calculation, a new identity is obtained by dividing the Naumov-Harrison-Scott identity by the Toshev identity. |
1602.08711 | Zhi-Gang Wang | Zhi-Gang Wang | Analysis of the $X(5568)$ as scalar tetraquark state in the
diquark-antidiquark model with QCD sum rules | 8 pages, 1 figure | Commun. Theor. Phys. 66 (2016) 335-339 | 10.1088/0253-6102/66/3/335 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article, we take the $X(5568)$ as the diquark-antidiquark type
tetraquark state with the spin-parity $J^P=0^+$, construct the
scalar-diquark-scalar-antidiquark type current, carry out the operator product
expansion up to the vacuum condensates of dimension-10, and study the mass and
pole residue in details with the QCD sum rules. We obtain the value
$M_X=\left(5.57\pm0.12 \right) \,\rm{GeV}$, which is consistent with the
experimental data. The present prediction favors assigning the $X(5568)$ to be
the scalar tetraquark state.
| [
{
"created": "Sun, 28 Feb 2016 13:13:05 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Jul 2016 02:31:14 GMT",
"version": "v2"
}
] | 2016-09-21 | [
[
"Wang",
"Zhi-Gang",
""
]
] | In this article, we take the $X(5568)$ as the diquark-antidiquark type tetraquark state with the spin-parity $J^P=0^+$, construct the scalar-diquark-scalar-antidiquark type current, carry out the operator product expansion up to the vacuum condensates of dimension-10, and study the mass and pole residue in details with the QCD sum rules. We obtain the value $M_X=\left(5.57\pm0.12 \right) \,\rm{GeV}$, which is consistent with the experimental data. The present prediction favors assigning the $X(5568)$ to be the scalar tetraquark state. |
hep-ph/9812503 | Valeri Yudichev | D. Blaschke (1), G. Burau (1), M. K. Volkov (2), V. L. Yudichev (2)
((1) Rostock Univ., Germany, (2) JINR, Dubna, Russia) | NJL model with infrared confinement | LaTeX, 12 pages, 3 figures, 1 table | null | null | MPG-VT-UR-178/98 | hep-ph | null | We consider an extended Nambu--Jona-Lasinio (NJL) model for the light meson
sector of QCD where unphysical quark production thresholds are excluded by an
infrared cut-off on the momentum integration within quark loop diagrams. This
chiral quark model conserves the low energy theorems. The infrared cut-off is
fixed selfconsistently by the dynamically generated quark mass (quark
condensate). The masses and decay widths of the \sigma- and \rho-mesons are
described in the model.
| [
{
"created": "Fri, 25 Dec 1998 15:15:05 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Blaschke",
"D.",
"",
"Rostock Univ., Germany"
],
[
"Burau",
"G.",
"",
"Rostock Univ., Germany"
],
[
"Volkov",
"M. K.",
"",
"JINR, Dubna, Russia"
],
[
"Yudichev",
"V. L.",
"",
"JINR, Dubna, Russia"
]
] | We consider an extended Nambu--Jona-Lasinio (NJL) model for the light meson sector of QCD where unphysical quark production thresholds are excluded by an infrared cut-off on the momentum integration within quark loop diagrams. This chiral quark model conserves the low energy theorems. The infrared cut-off is fixed selfconsistently by the dynamically generated quark mass (quark condensate). The masses and decay widths of the \sigma- and \rho-mesons are described in the model. |
hep-ph/0612172 | Aaron Dominguez | U. Aglietti, A. Belyaev, S. Berge, A. Blum, R. Bonciani, J. Cammin, M.
Carena, S. Chivukula, H. Davoudiasl, S. Dawson, G. Degrassi, A. Dominguez, J.
Donini, T. Dorigo, B.J. Field, T. Hahn, T. Han, S. Heinemeyer, S. Hesselbach,
G.-Y. Huang, I. Iashvilli, C.B. Jackson, T. Junk, S.-W. Lee, H.E. Logan, F.
Maltoni, B. Mellado, S. Moretti, S. Mrenna, P.M. Nadolsky, F.I. Olness, W.
Quayle, J. Rathsman, L. Reina, E.H. Simmons, A. Sopczak, A. Vicini, D.
Wackeroth, C.E.M. Wagner, G. Weiglein, G. Weiglein, S. Willenbrock, S.L. Wu,
C.P. Yuan | Tevatron-for-LHC Report: Higgs | Editors: A. Dominguez, I. Iashvili, S. Willenbrock. Conference
organizers: M. Carena, S. Mrenna | null | null | FERMILAB-CONF-06-467-E-T | hep-ph | null | The search for Higgs bosons in both the standard model and its extensions is
well under way at the Tevatron. As the integrated luminosity collected
increases into the multiple inverse femptobarn range, these searches are
becoming very interesting indeed. Meanwhile, the construction of the Large
Hadron Collider (LHC) and its associated experiments at CERN are nearing
completion. In this TeV4LHC workshop, it was realized that any experience at
the Tevatron with respect to backgrounds, experimental techniques and
theoretical calculations that can be verified at the Tevatron which have
relevance for future measurements at the LHC were important. Studies and
contributions to these efforts were made in three broad categories: theoretical
calculations of Higgs production and decay mechanisms; theoretical calculations
and discussions pertaining to non-standard model Higgs bosons; and experimental
reviews, analyses and developments at both the Tevatron and the upcoming LHC
experiments. All of these contributions represent real progress towards the
elucidation of the mechanism of electroweak symmetry breaking.
| [
{
"created": "Wed, 13 Dec 2006 22:18:44 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Dec 2007 20:09:21 GMT",
"version": "v2"
}
] | 2009-09-29 | [
[
"Aglietti",
"U.",
""
],
[
"Belyaev",
"A.",
""
],
[
"Berge",
"S.",
""
],
[
"Blum",
"A.",
""
],
[
"Bonciani",
"R.",
""
],
[
"Cammin",
"J.",
""
],
[
"Carena",
"M.",
""
],
[
"Chivukula",
"S.",
"... | The search for Higgs bosons in both the standard model and its extensions is well under way at the Tevatron. As the integrated luminosity collected increases into the multiple inverse femptobarn range, these searches are becoming very interesting indeed. Meanwhile, the construction of the Large Hadron Collider (LHC) and its associated experiments at CERN are nearing completion. In this TeV4LHC workshop, it was realized that any experience at the Tevatron with respect to backgrounds, experimental techniques and theoretical calculations that can be verified at the Tevatron which have relevance for future measurements at the LHC were important. Studies and contributions to these efforts were made in three broad categories: theoretical calculations of Higgs production and decay mechanisms; theoretical calculations and discussions pertaining to non-standard model Higgs bosons; and experimental reviews, analyses and developments at both the Tevatron and the upcoming LHC experiments. All of these contributions represent real progress towards the elucidation of the mechanism of electroweak symmetry breaking. |
hep-ph/9710296 | Arthur Hebecker | A Hebecker and P V Landshoff | Gauge Invariance and Factorisation in Exclusive Meson Production | 11 pages LaTeX, 4 figures included, uses epsf | Phys.Lett.B419:393-399,1998 | 10.1016/S0370-2693(97)01413-5 | DAMTP-97-102 | hep-ph | null | The structure of the nonperturbative vector meson vertex function complicates
the proof of the factorisation theorem for the reaction $\gamma^*p\to Vp$. It
leads to additional contributions but, in a simple model for the vertex
function, gauge invariance ensures that they cancel and factorisation is
preserved.
| [
{
"created": "Thu, 9 Oct 1997 14:49:18 GMT",
"version": "v1"
}
] | 2009-02-20 | [
[
"Hebecker",
"A",
""
],
[
"Landshoff",
"P V",
""
]
] | The structure of the nonperturbative vector meson vertex function complicates the proof of the factorisation theorem for the reaction $\gamma^*p\to Vp$. It leads to additional contributions but, in a simple model for the vertex function, gauge invariance ensures that they cancel and factorisation is preserved. |
1606.01747 | George De Conto | G. De Conto, V. Pleitez | Neutron electric dipole moment in the minimal 3-3-1 model | 18 paeges, 2 figures. arXiv admin note: substantial text overlap with
arXiv:1408.6551 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the electric dipole moment (EDM) for the neutron in the
framework of the minimal 3-3-1 model. We assume that the only source of $CP$
violation arises from a complex trilinear coupling constant and two complex
vacuum expectation values. However, from the constraint equations obtained from
the potential, only one physical phase remains. We find some constraints on the
possible values of this phase and masses of the exotic particles.
| [
{
"created": "Mon, 6 Jun 2016 13:54:09 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Sep 2016 01:25:59 GMT",
"version": "v2"
}
] | 2016-09-07 | [
[
"De Conto",
"G.",
""
],
[
"Pleitez",
"V.",
""
]
] | We calculate the electric dipole moment (EDM) for the neutron in the framework of the minimal 3-3-1 model. We assume that the only source of $CP$ violation arises from a complex trilinear coupling constant and two complex vacuum expectation values. However, from the constraint equations obtained from the potential, only one physical phase remains. We find some constraints on the possible values of this phase and masses of the exotic particles. |
1305.3873 | Eric Voutier | M.B. Barbaro, C. Maieron, E. Voutier | Lepton mass effects in the Bethe-Heitler process | Final version including errata | Phys. Letl. B 726 (2013) 505; B 727 (2013) 573 | 10.1016/j.physletb.2013.08.063 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop the full finite lepton mass formalism for the production of real
photons via the Bethe-Heitler reaction of unpolarized leptons off unpolarized
nucleons. Genuine lepton mass effects are described, in particular their
dependence upon the lepton mass and the initial beam energy, as well as their
sensitivity to the nucleon isospin. In the minimum momentum transfer region,
these effects dominate the muon induced proton cross section and become
significant for electron scattering at small $x_B$.
| [
{
"created": "Thu, 16 May 2013 17:08:27 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Aug 2013 08:30:40 GMT",
"version": "v2"
},
{
"created": "Wed, 12 Feb 2014 13:25:46 GMT",
"version": "v3"
}
] | 2015-06-16 | [
[
"Barbaro",
"M. B.",
""
],
[
"Maieron",
"C.",
""
],
[
"Voutier",
"E.",
""
]
] | We develop the full finite lepton mass formalism for the production of real photons via the Bethe-Heitler reaction of unpolarized leptons off unpolarized nucleons. Genuine lepton mass effects are described, in particular their dependence upon the lepton mass and the initial beam energy, as well as their sensitivity to the nucleon isospin. In the minimum momentum transfer region, these effects dominate the muon induced proton cross section and become significant for electron scattering at small $x_B$. |
hep-ph/9805341 | Slava Ilyin | S.Abdullin, M.Dubinin, V.Ilyin, D.Kovalenko, V.Savrin, N.Stepanov | Higgs Boson Discovery Potential of LHC in the Channel $pp
\to\gamma\gamma+jet$ | 15 pages including 6 figures, LaTeX, use epsfig.sty. To appear in
Phys.Lett.B. In this replacement minor LaTeX improvements are made | Phys.Lett. B431 (1998) 410-419 | 10.1016/S0370-2693(98)00547-4 | null | hep-ph | null | We discuss the SM Higgs discovery potential of LHC in the reaction $pp\to H+
jet\to\gamma\gamma+jet$ when the jet is observed at sufficiently high $E_t$ to
be reliably identified. We conclude that this channel gives promising discovery
possibilities for the Higgs boson mass range 100-140 GeV, during LHC operation
at a low luminosity. With 30 fb$^{-1}$ of accumulated data and for $M_H=120$
GeV about 100 signal events could be observed with the number of background
events larger by a factor of 2 only, showing a signal significance
$S/\sqrt{B}\sim 7$. We use the difference of distributions in the partonic
subprocess energy $\sqrt{\hat s}$ for the signal and background for a better
separation of the signal.
| [
{
"created": "Fri, 15 May 1998 16:55:25 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Jun 1998 16:57:48 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Abdullin",
"S.",
""
],
[
"Dubinin",
"M.",
""
],
[
"Ilyin",
"V.",
""
],
[
"Kovalenko",
"D.",
""
],
[
"Savrin",
"V.",
""
],
[
"Stepanov",
"N.",
""
]
] | We discuss the SM Higgs discovery potential of LHC in the reaction $pp\to H+ jet\to\gamma\gamma+jet$ when the jet is observed at sufficiently high $E_t$ to be reliably identified. We conclude that this channel gives promising discovery possibilities for the Higgs boson mass range 100-140 GeV, during LHC operation at a low luminosity. With 30 fb$^{-1}$ of accumulated data and for $M_H=120$ GeV about 100 signal events could be observed with the number of background events larger by a factor of 2 only, showing a signal significance $S/\sqrt{B}\sim 7$. We use the difference of distributions in the partonic subprocess energy $\sqrt{\hat s}$ for the signal and background for a better separation of the signal. |
hep-ph/9709409 | Francesco Vissani | Francesco Vissani | Do experiments suggest a hierarchy problem? | revtex, 4 pages, 1 figure | Phys.Rev. D57 (1998) 7027-7030 | 10.1103/PhysRevD.57.7027 | IC/97/148 | hep-ph | null | The hierarchy problem of the scalar sector of the standard model is
reformulated, emphasizing the role of experimental facts that may suggest the
existence of a new physics large mass scale, for instance indications of the
instability of the matter, or indications in favor of massive neutrinos. In the
see-saw model for the neutrino masses a hierarchy problem arises if the mass of
the right-handed neutrinos is larger than approximatively $10^7$ GeV: this
problem, and its possible solutions, are discussed.
| [
{
"created": "Fri, 19 Sep 1997 16:50:10 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Vissani",
"Francesco",
""
]
] | The hierarchy problem of the scalar sector of the standard model is reformulated, emphasizing the role of experimental facts that may suggest the existence of a new physics large mass scale, for instance indications of the instability of the matter, or indications in favor of massive neutrinos. In the see-saw model for the neutrino masses a hierarchy problem arises if the mass of the right-handed neutrinos is larger than approximatively $10^7$ GeV: this problem, and its possible solutions, are discussed. |
hep-ph/9609235 | Ramon Munoz Tapia | S. Moretti (1), R. Munoz-Tapia (2) and K. Odagiri (1) ((1) Cavendish
Lab. Cambridge UK, (2) Universidad de Granada, Spain) | Light, long-lived and secluded: can gluinos be driven out from LEP1 data
? | 10 pages, LaTeX, 3 PostScript figures embedded with epsfig. Complete
ps paper and figures available also at ftp://ftae3.ugr.es/pub/rmt/ugrft70.ps | Phys.Lett. B389 (1996) 545-550 | 10.1016/S0370-2693(96)01306-8 | Cavendish-HEP-96/16, DFTT 52/96, UGR-FT-70 | hep-ph | null | We briefly report about a possible settlement of the still ongoing dispute
concerning the existence of SUSY signals in 4jet events at LEP1. We base our
arguments on a simple selection strategy exploiting secondary vertex tagging
and kinematical constraints, which could allow one to access or exclude gluino
events for a broad range of masses and lifetimes.
| [
{
"created": "Tue, 3 Sep 1996 09:53:43 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Moretti",
"S.",
""
],
[
"Munoz-Tapia",
"R.",
""
],
[
"Odagiri",
"K.",
""
]
] | We briefly report about a possible settlement of the still ongoing dispute concerning the existence of SUSY signals in 4jet events at LEP1. We base our arguments on a simple selection strategy exploiting secondary vertex tagging and kinematical constraints, which could allow one to access or exclude gluino events for a broad range of masses and lifetimes. |
2112.00293 | Jiaxing Zhao | Jiaxing Zhao, Baoyi Chen, and Pengfei Zhuang | Charmonium Triangular Flow in High Energy Nuclear Collisions | 7 pages, 3 figures | null | 10.1103/PhysRevC.105.034902 | null | hep-ph nucl-th | http://creativecommons.org/publicdomain/zero/1.0/ | We calculate, for the first time, $J/\psi$ triangular flow in high energy
nuclear collisions. The charmonium motion in medium is controlled by a
transport equation with loss and gain terms, and the evolution of the hot
medium is governed by a single-shot hydrodynamic equation with a triangularly
deformed initial condition. In comparison with the elliptic flow $v_2$, the
triangular flow $v_3$ comes almost completely from the charmonium regeneration
in the quark gluon plasma and therefore is more sensitive to the medium
properties.
| [
{
"created": "Wed, 1 Dec 2021 06:06:59 GMT",
"version": "v1"
}
] | 2022-03-14 | [
[
"Zhao",
"Jiaxing",
""
],
[
"Chen",
"Baoyi",
""
],
[
"Zhuang",
"Pengfei",
""
]
] | We calculate, for the first time, $J/\psi$ triangular flow in high energy nuclear collisions. The charmonium motion in medium is controlled by a transport equation with loss and gain terms, and the evolution of the hot medium is governed by a single-shot hydrodynamic equation with a triangularly deformed initial condition. In comparison with the elliptic flow $v_2$, the triangular flow $v_3$ comes almost completely from the charmonium regeneration in the quark gluon plasma and therefore is more sensitive to the medium properties. |
2101.12131 | Mengchao Zhang | Junmou Chen, Chengcheng Han, Jin Min Yang, Mengchao Zhang | Probing bino NLSP at lepton colliders | 12 pages, 7 figures | Phys. Rev. D 104, 015009 (2021) | 10.1103/PhysRevD.104.015009 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a scenario where light bino is the next-to-lightest
supersymmetric particle (NLSP) and gravitino/axino is the lightest
superysmmetric particle (LSP). For a bino mass less than or around hundred GeV,
it can be pair produced at the future lepton colliders through $t-$channel
slepton exchange, subsequently decaying into a gravitino/axino plus a photon.
We study the prospects to look for such binos at the future colliders and find
that a bino mass around 100 GeV can be probed at the $2\sigma$ ($5\sigma$)
level for a slepton below 2 TeV (1.5 TeV) with a luminosity 3 $ab^{-1}$. For a
bino mass around 10 GeV, a slepton mass less than 4 TeV (3 TeV) can be probed
at the $2\sigma$ ($5\sigma$) level, which is much beyond the reach of the LHC
for direct slepton searches.
| [
{
"created": "Thu, 28 Jan 2021 17:24:00 GMT",
"version": "v1"
}
] | 2021-07-14 | [
[
"Chen",
"Junmou",
""
],
[
"Han",
"Chengcheng",
""
],
[
"Yang",
"Jin Min",
""
],
[
"Zhang",
"Mengchao",
""
]
] | We consider a scenario where light bino is the next-to-lightest supersymmetric particle (NLSP) and gravitino/axino is the lightest superysmmetric particle (LSP). For a bino mass less than or around hundred GeV, it can be pair produced at the future lepton colliders through $t-$channel slepton exchange, subsequently decaying into a gravitino/axino plus a photon. We study the prospects to look for such binos at the future colliders and find that a bino mass around 100 GeV can be probed at the $2\sigma$ ($5\sigma$) level for a slepton below 2 TeV (1.5 TeV) with a luminosity 3 $ab^{-1}$. For a bino mass around 10 GeV, a slepton mass less than 4 TeV (3 TeV) can be probed at the $2\sigma$ ($5\sigma$) level, which is much beyond the reach of the LHC for direct slepton searches. |
1608.07295 | Clarissa Siqueira | Farinaldo S. Queiroz, Clarissa Siqueira and Jos\'e W. F. Valle | Constraining Flavor Changing Interactions from LHC Run-2 Dilepton Bounds
with Vector Mediators | 8 pages, 9 figures, Matches version accepted in Phys. Lett. B | null | 10.1016/j.physletb.2016.10.057 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Within the context of vector mediators, is a new signal observed in flavor
changing interactions, particularly in the neutral mesons systems
$K^{0}-\bar{K}^{0}$, $D^{0}-\bar{D}^{0}$ and $B^0-\bar{B^0}$, consistent with
dilepton resonance searches at the LHC? In the attempt to address this very
simple question, we discuss the complementarity between flavor changing neutral
current (FCNC) and dilepton resonance searches at the LHC run 2 at $13$TeV with
$3.2\, {\rm fb^{-1}}$ of integrated luminosity, in the context of vector
mediators at tree level. Vector mediators, are often studied in the flavor
changing framework, specially in the light of the recent LHCb anomaly observed
at the rare B decay. However, the existence of stringent dilepton bound
severely constrains flavor changing interactions, due to restrictive limits on
the $Z^{\prime}$ mass. We discuss this interplay explicitly in the well
motivated framework of a 3-3-1 scheme, where fermions and scalars are arranged
in the fundamental representation of the weak SU(3) gauge group. Due to the
paucity of relevant parameters, we conclude dilepton data leave little room for
a possible new physics signal stemming from these systems, unless a very
peculiar texture parametrization is used in the diagonalization of the CKM
matrix. In other words, if a signal is observed in such flavor changing
interactions, it is unlikely comes from a 3-3-1 model.
| [
{
"created": "Thu, 25 Aug 2016 20:00:09 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Nov 2016 18:32:06 GMT",
"version": "v2"
}
] | 2016-11-03 | [
[
"Queiroz",
"Farinaldo S.",
""
],
[
"Siqueira",
"Clarissa",
""
],
[
"Valle",
"José W. F.",
""
]
] | Within the context of vector mediators, is a new signal observed in flavor changing interactions, particularly in the neutral mesons systems $K^{0}-\bar{K}^{0}$, $D^{0}-\bar{D}^{0}$ and $B^0-\bar{B^0}$, consistent with dilepton resonance searches at the LHC? In the attempt to address this very simple question, we discuss the complementarity between flavor changing neutral current (FCNC) and dilepton resonance searches at the LHC run 2 at $13$TeV with $3.2\, {\rm fb^{-1}}$ of integrated luminosity, in the context of vector mediators at tree level. Vector mediators, are often studied in the flavor changing framework, specially in the light of the recent LHCb anomaly observed at the rare B decay. However, the existence of stringent dilepton bound severely constrains flavor changing interactions, due to restrictive limits on the $Z^{\prime}$ mass. We discuss this interplay explicitly in the well motivated framework of a 3-3-1 scheme, where fermions and scalars are arranged in the fundamental representation of the weak SU(3) gauge group. Due to the paucity of relevant parameters, we conclude dilepton data leave little room for a possible new physics signal stemming from these systems, unless a very peculiar texture parametrization is used in the diagonalization of the CKM matrix. In other words, if a signal is observed in such flavor changing interactions, it is unlikely comes from a 3-3-1 model. |
hep-ph/0412039 | Genaro Toledo | G. Toledo Sanchez | Gauge invariance, radiative interferences and properties of vector
mesons | 5 pages, 1 figure. To appear in the Proceedings of the IX Mexican
Workshop on Particles and Fields, Colima Mexico. Uses RevTex4 | J.Phys.Conf.Ser. 37 (2006) 114-126 | 10.1088/1742-6596/37/1/019 | null | hep-ph | null | We state the implications on the properties of vector mesons due to gauge
invariance. In particular, we find that polarized vector mesons exhibit a
property in the radiation distribution of order $\omega^{-1}$ in the photon
energy, namely it is null when the gyromagnetic ratio becomes $g=2$. Therefore,
the generalization of the Burnett-Kroll theorem for polarized vector-meson
states is held only if $g=2$. In addition, radiative interferences between the
electric charge and any gauge invariant term is found to be parametrized by a
common global factor which can be used to extract information of the involved
states by a proper choice of the kinematical region, where they could be
relevant.
| [
{
"created": "Thu, 2 Dec 2004 21:18:51 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Sanchez",
"G. Toledo",
""
]
] | We state the implications on the properties of vector mesons due to gauge invariance. In particular, we find that polarized vector mesons exhibit a property in the radiation distribution of order $\omega^{-1}$ in the photon energy, namely it is null when the gyromagnetic ratio becomes $g=2$. Therefore, the generalization of the Burnett-Kroll theorem for polarized vector-meson states is held only if $g=2$. In addition, radiative interferences between the electric charge and any gauge invariant term is found to be parametrized by a common global factor which can be used to extract information of the involved states by a proper choice of the kinematical region, where they could be relevant. |
1102.3686 | Alberto Accardi | A.Accardi, W.Melnitchouk, J.F.Owens, M.E.Christy, C.E.Keppel, L.Zhu,
J.G.Morfin | Uncertainties in determining parton distributions at large x | 37 pages, 13 figures. Final published version | Phys.Rev.D84:014008,2011 | 10.1103/PhysRevD.84.014008 | JLAB-THY-11-1312 | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We critically examine uncertainties in parton distribution functions (PDFs)
at large x arising from nuclear effects in deuterium F2 structure function
data. Within a global PDF analysis, we assess the impact on the PDFs from
uncertainties in the deuteron wave function at short distances and nucleon
off-shell effects, the use of relativistic kinematics, as well as the use of
less a restrictive parametrization of the d/u ratio. We find that in particular
the d-quark and gluon PDFs vary significantly with the choice of nuclear model.
We highlight the impact of these uncertainties on the determination of the
neutron structure function, and on W boson production and parton luminosity at
the Tevatron and the LHC. Finally, we discuss prospects for new measurements
sensitive to the d-quark and gluon distributions but insensitive to nuclear
corrections.
| [
{
"created": "Thu, 17 Feb 2011 20:47:13 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Jul 2011 18:23:46 GMT",
"version": "v2"
}
] | 2011-08-17 | [
[
"Accardi",
"A.",
""
],
[
"Melnitchouk",
"W.",
""
],
[
"Owens",
"J. F.",
""
],
[
"Christy",
"M. E.",
""
],
[
"Keppel",
"C. E.",
""
],
[
"Zhu",
"L.",
""
],
[
"Morfin",
"J. G.",
""
]
] | We critically examine uncertainties in parton distribution functions (PDFs) at large x arising from nuclear effects in deuterium F2 structure function data. Within a global PDF analysis, we assess the impact on the PDFs from uncertainties in the deuteron wave function at short distances and nucleon off-shell effects, the use of relativistic kinematics, as well as the use of less a restrictive parametrization of the d/u ratio. We find that in particular the d-quark and gluon PDFs vary significantly with the choice of nuclear model. We highlight the impact of these uncertainties on the determination of the neutron structure function, and on W boson production and parton luminosity at the Tevatron and the LHC. Finally, we discuss prospects for new measurements sensitive to the d-quark and gluon distributions but insensitive to nuclear corrections. |
2303.10861 | Akifumi Chitose | Akifumi Chitose, Masahiro Ibe | Interactions of electrical and magnetic charges and dark topological
defects | 17 pages, 4 figures | Phys. Rev. D 108, 035044 (2023) | 10.1103/PhysRevD.108.035044 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a model of dark photon which appears as a result of the
successive symmetry breaking SU(2)$\,\to\,$U(1)$\,\to \mathbb{Z}_2$, where
various types of topological defects appear in the dark sector. In this paper,
we study the interactions between QED charges and the dark topological defects
through mixing between QED photon and dark photon. In particular, we extend our
previous analysis by incorporating the magnetic mixing and $\theta$-terms. We
also consider the dyons and dyonic beads in the dark sector. Notably, dark
magnetic/dyonic beads are found to induce a QED Coulomb potential through the
magnetic mixing despite finite mass of the dark photon.
| [
{
"created": "Mon, 20 Mar 2023 04:47:26 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Sep 2023 05:01:18 GMT",
"version": "v2"
}
] | 2023-09-07 | [
[
"Chitose",
"Akifumi",
""
],
[
"Ibe",
"Masahiro",
""
]
] | We consider a model of dark photon which appears as a result of the successive symmetry breaking SU(2)$\,\to\,$U(1)$\,\to \mathbb{Z}_2$, where various types of topological defects appear in the dark sector. In this paper, we study the interactions between QED charges and the dark topological defects through mixing between QED photon and dark photon. In particular, we extend our previous analysis by incorporating the magnetic mixing and $\theta$-terms. We also consider the dyons and dyonic beads in the dark sector. Notably, dark magnetic/dyonic beads are found to induce a QED Coulomb potential through the magnetic mixing despite finite mass of the dark photon. |
2303.16514 | Chetheekkaranpurackal Joseph Ouseph | Kingman Cheung, C.J. Ouseph | Axion Like Particle Search at Higgs Factories | 20 pages, 8 figures | null | 10.1103/PhysRevD.108.035003 | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | We study the potential of the future Higgs factories, including the ILC,
CEPC, and FCC-ee with $\sqrt{s}$ = 240-250 GeV on discovering axion-like
particles (ALPs) through various production channels in the leptonic final
states, $e^+e^- \to f\bar{f} a$, where $f=e,\mu,\nu$. We show that the $e^+e^-
\to e^+e^- a$ with $a \to \gamma\gamma$ provides the best bounds for the
$g_{a\gamma\gamma}$ and $g_{aZZ}$ couplings, while $e^+e^- \to \nu\bar{\nu}a$,
with $a \to \gamma\gamma$ offers the best bounds for the $g_{aZZ}$ and
$g_{aZ\gamma}$ couplings. The $e^+e^- \to \mu^+\mu^- a$ with $ a \to
\gamma\gamma$ provides intermediate sensitivity to the $g_{aZZ}$ coupling. Our
estimates of the bounds for the $g_{a\gamma\gamma}$, $g_{aZ\gamma}$, and
$g_{aZZ}$ couplings as a function of ALP mass ($M_a$) ranging from 0.1 GeV to
100 GeV provide valuable insights for future experiments aiming to detect ALPs.
We find that $g_{a\gamma\gamma}$ around $1.5\times10^{-4}~\rm GeV^{-1}$ for
$M_a = 0.1-6$ GeV is currently not ruled out by any other experiments.
| [
{
"created": "Wed, 29 Mar 2023 07:46:30 GMT",
"version": "v1"
}
] | 2023-08-16 | [
[
"Cheung",
"Kingman",
""
],
[
"Ouseph",
"C. J.",
""
]
] | We study the potential of the future Higgs factories, including the ILC, CEPC, and FCC-ee with $\sqrt{s}$ = 240-250 GeV on discovering axion-like particles (ALPs) through various production channels in the leptonic final states, $e^+e^- \to f\bar{f} a$, where $f=e,\mu,\nu$. We show that the $e^+e^- \to e^+e^- a$ with $a \to \gamma\gamma$ provides the best bounds for the $g_{a\gamma\gamma}$ and $g_{aZZ}$ couplings, while $e^+e^- \to \nu\bar{\nu}a$, with $a \to \gamma\gamma$ offers the best bounds for the $g_{aZZ}$ and $g_{aZ\gamma}$ couplings. The $e^+e^- \to \mu^+\mu^- a$ with $ a \to \gamma\gamma$ provides intermediate sensitivity to the $g_{aZZ}$ coupling. Our estimates of the bounds for the $g_{a\gamma\gamma}$, $g_{aZ\gamma}$, and $g_{aZZ}$ couplings as a function of ALP mass ($M_a$) ranging from 0.1 GeV to 100 GeV provide valuable insights for future experiments aiming to detect ALPs. We find that $g_{a\gamma\gamma}$ around $1.5\times10^{-4}~\rm GeV^{-1}$ for $M_a = 0.1-6$ GeV is currently not ruled out by any other experiments. |
2002.06725 | Romulo Rougemont | Romulo Rougemont (Rio de Janeiro State U.) | Jet quenching parameters in strongly coupled anisotropic plasmas in the
presence of magnetic fields | 28 pages, 3 figures, accepted for publication in Physical Review D | Phys. Rev. D 102, 034009 (2020) | 10.1103/PhysRevD.102.034009 | null | hep-ph hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I use the holographic gauge/gravity duality to systematically calculate the
jet quenching parameters in strongly coupled anisotropic plasmas in the
presence of external magnetic fields. The magnetic field breaks down spatial
rotation symmetry from $SO(3)$ to $SO(2)$, leading to the presence of multiple
anisotropic jet quenching parameters, which are evaluated here in two quite
different holographic settings. One of them corresponds to a top-down
deformation of the strongly coupled $\mathcal{N} = 4$ Super Yang-Mills plasma
triggered by an external magnetic field, while the other one is a bottom-up
Einstein-Maxwell-Dilaton model of phenomenological relevance for high energy
peripheral heavy ion collisions, since it is able to provide a quantitative
description of $(2+1)$-flavors lattice QCD thermodynamics with physical quark
masses at zero and nonzero magnetic fields. I find for both models an overall
enhancement of all the anisotropic jet quenching parameters with increasing
magnetic fields. Moreover, I also conclude that for both models transverse
momentum broadening is larger in transverse directions than in the direction of
the magnetic field. Since these conclusions are shown to hold for two rather
different holographic setups at finite temperature and magnetic fields, they
are suggested as fairly robust features of strongly coupled anisotropic
magnetized plasmas.
| [
{
"created": "Mon, 17 Feb 2020 00:28:29 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Aug 2020 01:30:08 GMT",
"version": "v2"
}
] | 2020-08-11 | [
[
"Rougemont",
"Romulo",
"",
"Rio de Janeiro State U."
]
] | I use the holographic gauge/gravity duality to systematically calculate the jet quenching parameters in strongly coupled anisotropic plasmas in the presence of external magnetic fields. The magnetic field breaks down spatial rotation symmetry from $SO(3)$ to $SO(2)$, leading to the presence of multiple anisotropic jet quenching parameters, which are evaluated here in two quite different holographic settings. One of them corresponds to a top-down deformation of the strongly coupled $\mathcal{N} = 4$ Super Yang-Mills plasma triggered by an external magnetic field, while the other one is a bottom-up Einstein-Maxwell-Dilaton model of phenomenological relevance for high energy peripheral heavy ion collisions, since it is able to provide a quantitative description of $(2+1)$-flavors lattice QCD thermodynamics with physical quark masses at zero and nonzero magnetic fields. I find for both models an overall enhancement of all the anisotropic jet quenching parameters with increasing magnetic fields. Moreover, I also conclude that for both models transverse momentum broadening is larger in transverse directions than in the direction of the magnetic field. Since these conclusions are shown to hold for two rather different holographic setups at finite temperature and magnetic fields, they are suggested as fairly robust features of strongly coupled anisotropic magnetized plasmas. |
hep-ph/9805398 | null | Neven Bilic (Rudjer Boskovic Institute Zagreb) David Tsiklauri and
Raoul Viollier (University of Cape Town) | Gravitational phase transition of heavy neutrino matter | 10 pages, LaTex, 4 postscript figures | Prog.Part.Nucl.Phys. 40 (1998) 17 | 10.1016/S0146-6410(98)00004-0 | UCT-TP 331/97 | hep-ph | null | In the framework of the Thomas-Fermi model at finite temperature, we show
that a cooling nondegenerate gas of massive neutrinos will undergo a phase
transition in which quasi-degenerate supermassive neutrino stars are formed
through gravitational collapse. For neutrinos in the mass range of 10 to 25 keV
these compact dark objects could mimic the role of supermassive black holes
that are usually assumed to exist at the centres galaxies. Astrophysical
implications and constraints on the neutrino mass are discussed for this
scenario.
| [
{
"created": "Wed, 20 May 1998 16:00:59 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Bilic",
"Neven",
"",
"Rudjer Boskovic Institute Zagreb"
],
[
"Tsiklauri",
"David",
"",
"University of Cape Town"
],
[
"Viollier",
"Raoul",
"",
"University of Cape Town"
]
] | In the framework of the Thomas-Fermi model at finite temperature, we show that a cooling nondegenerate gas of massive neutrinos will undergo a phase transition in which quasi-degenerate supermassive neutrino stars are formed through gravitational collapse. For neutrinos in the mass range of 10 to 25 keV these compact dark objects could mimic the role of supermassive black holes that are usually assumed to exist at the centres galaxies. Astrophysical implications and constraints on the neutrino mass are discussed for this scenario. |
1610.01840 | Russell Kirk | A. Butcher, R. Kirk, J. Monroe and S. M. West | Can Tonne-Scale Direct Detection Experiments Discover Nuclear Dark
Matter? | 23 pages, 7 multipanel figures | null | 10.1088/1475-7516/2017/10/035 | null | hep-ph astro-ph.CO hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Models of nuclear dark matter propose that the dark sector contains large
composite states consisting of dark nucleons in analogy to Standard Model
nuclei. We examine the direct detection phenomenology of a particular class of
nuclear dark matter model at the current generation of tonne-scale liquid noble
experiments, in particular DEAP-3600 and XENON1T. In our chosen nuclear dark
matter scenario distinctive features arise in the recoil energy spectra due to
the non-point-like nature of the composite dark matter state. We calculate the
number of events required to distinguish these spectra from those of a standard
point-like WIMP state with a decaying exponential recoil spectrum. In the most
favourable regions of nuclear dark matter parameter space, we find that a few
tens of events are needed to distinguish nuclear dark matter from WIMPs at the
$3\,\sigma$ level in a single experiment. Given the total exposure time of
DEAP-3600 and XENON1T we find that at best a $2\,\sigma$ distinction is
possible by these experiments individually, while $3\,\sigma$ sensitivity is
reached for a range of parameters by the combination of the two experiments. We
show that future upgrades of these experiments have potential to distinguish a
large range of nuclear dark matter models from that of a WIMP at greater than
$3\,\sigma$.
| [
{
"created": "Thu, 6 Oct 2016 12:31:15 GMT",
"version": "v1"
}
] | 2017-11-01 | [
[
"Butcher",
"A.",
""
],
[
"Kirk",
"R.",
""
],
[
"Monroe",
"J.",
""
],
[
"West",
"S. M.",
""
]
] | Models of nuclear dark matter propose that the dark sector contains large composite states consisting of dark nucleons in analogy to Standard Model nuclei. We examine the direct detection phenomenology of a particular class of nuclear dark matter model at the current generation of tonne-scale liquid noble experiments, in particular DEAP-3600 and XENON1T. In our chosen nuclear dark matter scenario distinctive features arise in the recoil energy spectra due to the non-point-like nature of the composite dark matter state. We calculate the number of events required to distinguish these spectra from those of a standard point-like WIMP state with a decaying exponential recoil spectrum. In the most favourable regions of nuclear dark matter parameter space, we find that a few tens of events are needed to distinguish nuclear dark matter from WIMPs at the $3\,\sigma$ level in a single experiment. Given the total exposure time of DEAP-3600 and XENON1T we find that at best a $2\,\sigma$ distinction is possible by these experiments individually, while $3\,\sigma$ sensitivity is reached for a range of parameters by the combination of the two experiments. We show that future upgrades of these experiments have potential to distinguish a large range of nuclear dark matter models from that of a WIMP at greater than $3\,\sigma$. |
2212.06678 | Robin Ducrocq M. | Jeremy Andrea, Daniel Bloch, Eric Conte, Douja Darej, Robin Ducrocq,
Emery Nibigira | Probing displaced top quark signature at the LHC Run 3 | 24 pages, 48 figures | null | 10.1140/epjc/s10052-023-11470-6 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In the context of prospective studies for searches of new physics at the LHC
Run 3, this paper investigates the relevance of using top quarks produced from
new long-lived particles, and detected in the tracker volume of the ATLAS and
CMS experiments. Such a signature, referred to as displaced top quarks, leads
to final states containing displaced vertices and a high multiplicity of
displaced jets and tracks, thanks to the top quark decays. Therefore, it is a
possible powerful tool for searching for new long-lived particles. Three
simplified models based on supersymmetry are explicitly designed for the study
of this signature. They differ according to the nature of the long-lived heavy
particle which produces at least one top quark: electrically neutral or
charged, coloured or non-coloured long-lived particle. For each model, a wide
region of parameter space, consistent with a reasonable number of displaced top
quarks decaying in a typical tracker volume has been probed. From this study,
promising benchmarks are defined and experimental guidelines are suggested.
| [
{
"created": "Tue, 13 Dec 2022 15:57:16 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Mar 2023 08:11:34 GMT",
"version": "v2"
}
] | 2023-05-03 | [
[
"Andrea",
"Jeremy",
""
],
[
"Bloch",
"Daniel",
""
],
[
"Conte",
"Eric",
""
],
[
"Darej",
"Douja",
""
],
[
"Ducrocq",
"Robin",
""
],
[
"Nibigira",
"Emery",
""
]
] | In the context of prospective studies for searches of new physics at the LHC Run 3, this paper investigates the relevance of using top quarks produced from new long-lived particles, and detected in the tracker volume of the ATLAS and CMS experiments. Such a signature, referred to as displaced top quarks, leads to final states containing displaced vertices and a high multiplicity of displaced jets and tracks, thanks to the top quark decays. Therefore, it is a possible powerful tool for searching for new long-lived particles. Three simplified models based on supersymmetry are explicitly designed for the study of this signature. They differ according to the nature of the long-lived heavy particle which produces at least one top quark: electrically neutral or charged, coloured or non-coloured long-lived particle. For each model, a wide region of parameter space, consistent with a reasonable number of displaced top quarks decaying in a typical tracker volume has been probed. From this study, promising benchmarks are defined and experimental guidelines are suggested. |
hep-ph/9903319 | John Terning | Csaba Csaki, Michael Graesser, John Terning (Berkeley) | Late Inflation and the Moduli Problem of Sub-Millimeter Dimensions | 9 pages, LaTeX | Phys.Lett.B456:16-21,1999 | 10.1016/S0370-2693(99)00422-0 | LBNL-42952, UCB-PTH-99/06 | hep-ph | null | We consider a recent model with sub-millimeter sized extra dimensions, where
the field that determines the size of the extra dimensions (the radion) also
acts as an inflaton. The radion is also a stable modulus, and its coherent
oscillations can potentially overclose the Universe. It has been suggested that
a second round of late inflation can solve this problem, however we find that
this scenario does not allow for sufficient reheating of the Universe.
| [
{
"created": "Thu, 11 Mar 1999 23:03:20 GMT",
"version": "v1"
}
] | 2009-09-17 | [
[
"Csaki",
"Csaba",
"",
"Berkeley"
],
[
"Graesser",
"Michael",
"",
"Berkeley"
],
[
"Terning",
"John",
"",
"Berkeley"
]
] | We consider a recent model with sub-millimeter sized extra dimensions, where the field that determines the size of the extra dimensions (the radion) also acts as an inflaton. The radion is also a stable modulus, and its coherent oscillations can potentially overclose the Universe. It has been suggested that a second round of late inflation can solve this problem, however we find that this scenario does not allow for sufficient reheating of the Universe. |
1203.1762 | Francois Richard | Francois Richard | Diboson production at LHC with warped extra dimensions | 15 pages, 8 figures | null | null | LAL 12-49 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | From the warped extra-dimensional model interpretation of the two
forward-backward asymmetries observed on heavy quarks at LEP1, AFBb, and at
Tevatron, AFBt, one predicts that LHC could observe, with the luminosity
collected in 2011-2012, significant excesses in the diboson production for
large invariant masses of the Z+W system, mZW, and, the W+W system, mWW.
| [
{
"created": "Thu, 8 Mar 2012 11:56:05 GMT",
"version": "v1"
}
] | 2012-03-09 | [
[
"Richard",
"Francois",
""
]
] | From the warped extra-dimensional model interpretation of the two forward-backward asymmetries observed on heavy quarks at LEP1, AFBb, and at Tevatron, AFBt, one predicts that LHC could observe, with the luminosity collected in 2011-2012, significant excesses in the diboson production for large invariant masses of the Z+W system, mZW, and, the W+W system, mWW. |
1309.7822 | Dave Sutherland | Ben Gripaios and Dave Sutherland | On LHC searches for CP-violating, dimension-6 electroweak gauge boson
operators | pdfLaTeX, 12 pages, 4 feynmf figures. Formatted for JHEP. v2: Fixed
numerical error and added reference | Phys. Rev. D 89, 076004 (2014) | 10.1103/PhysRevD.89.076004 | Cavendish-HEP-13/08 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We reconsider the prospects for observing a dimension-6, CP-violating
operator involving $W^+W^-Z$ at the LHC. Firstly, we correct a number of
earlier calculations of the loop contribution to the neutron electric dipole
moment of a companion operator, involving $W^+W^-\gamma$, showing that
measurements imply a very strong bound on the companion operator. Secondly, we
quantify the link between the two operators, showing that strongly-coupled new
physics could only be observable in proposed searches if it appeared at a scale
below $\sim 170$ GeV. This is most unlikely, given the null results of other
searches at the LHC and elsewhere.
| [
{
"created": "Mon, 30 Sep 2013 12:34:21 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Oct 2013 18:33:06 GMT",
"version": "v2"
}
] | 2015-04-08 | [
[
"Gripaios",
"Ben",
""
],
[
"Sutherland",
"Dave",
""
]
] | We reconsider the prospects for observing a dimension-6, CP-violating operator involving $W^+W^-Z$ at the LHC. Firstly, we correct a number of earlier calculations of the loop contribution to the neutron electric dipole moment of a companion operator, involving $W^+W^-\gamma$, showing that measurements imply a very strong bound on the companion operator. Secondly, we quantify the link between the two operators, showing that strongly-coupled new physics could only be observable in proposed searches if it appeared at a scale below $\sim 170$ GeV. This is most unlikely, given the null results of other searches at the LHC and elsewhere. |
2208.14325 | Johannes Bl\"umlein | J. Bl\"umlein, P. Marquard, C. Schneider and K. Sch\"onwald | The massless three-loop Wilson coefficients for the deep-inelastic
structure functions $F_2, F_L, xF_3$ and $g_1$ | 159 pages Latex | null | 10.1007/JHEP11(2022)156 | DESY 22-123, DO-TH 22/20, TTP 22-057, RISC Report Series 22-12,
SAGEX-22-30 | hep-ph hep-ex hep-th | http://creativecommons.org/licenses/by/4.0/ | We calculate the massless unpolarized Wilson coefficients for deeply
inelastic scattering for the structure functions $F_2(x,Q^2), F_L(x,Q^2), x
F_3(x,Q^2)$ in the $\overline{\sf MS}$ scheme and the polarized Wilson
coefficients of the structure function $g_1(x,Q^2)$ in the Larin scheme up to
three--loop order in QCD in a fully automated way based on the method of
arbitrary high Mellin moments. We work in the Larin scheme in the case of
contributing axial--vector couplings or polarized nucleons. For the unpolarized
structure functions we compare to results given in the literature. The
polarized three--loop Wilson coefficients are calculated for the first time. As
a by--product we also obtain the quarkonic three--loop anomalous dimensions
from the $O(1/\varepsilon)$ terms of the unrenormalized forward Compton
amplitude. Expansions for small and large values of the Bjorken variable $x$
are provided.
| [
{
"created": "Tue, 30 Aug 2022 15:05:34 GMT",
"version": "v1"
}
] | 2022-12-14 | [
[
"Blümlein",
"J.",
""
],
[
"Marquard",
"P.",
""
],
[
"Schneider",
"C.",
""
],
[
"Schönwald",
"K.",
""
]
] | We calculate the massless unpolarized Wilson coefficients for deeply inelastic scattering for the structure functions $F_2(x,Q^2), F_L(x,Q^2), x F_3(x,Q^2)$ in the $\overline{\sf MS}$ scheme and the polarized Wilson coefficients of the structure function $g_1(x,Q^2)$ in the Larin scheme up to three--loop order in QCD in a fully automated way based on the method of arbitrary high Mellin moments. We work in the Larin scheme in the case of contributing axial--vector couplings or polarized nucleons. For the unpolarized structure functions we compare to results given in the literature. The polarized three--loop Wilson coefficients are calculated for the first time. As a by--product we also obtain the quarkonic three--loop anomalous dimensions from the $O(1/\varepsilon)$ terms of the unrenormalized forward Compton amplitude. Expansions for small and large values of the Bjorken variable $x$ are provided. |
hep-ph/0303068 | Mustafa Savci | T. M. Aliev, I. Kanik, M. Savci | Magnetic moment of the (rho) meson in light cone QCD | 11 pages, 3 figures, LaTeX formatted | Phys.Rev. D68 (2003) 056002 | 10.1103/PhysRevD.68.056002 | metu-phys-hep-03-018 | hep-ph | null | The magnetic moment $\mu$ of the "rho" meson is studied in QCD light cone sum
rules, and it is found that "mu = (2.3 pm 0.5)". A comparison of our result on
the magnetic moment of the "rho" meson with the predictions of the other
approaches, is presented.
| [
{
"created": "Sun, 9 Mar 2003 13:54:01 GMT",
"version": "v1"
},
{
"created": "Wed, 7 May 2003 13:47:39 GMT",
"version": "v2"
},
{
"created": "Thu, 5 Jun 2003 18:35:39 GMT",
"version": "v3"
}
] | 2009-11-10 | [
[
"Aliev",
"T. M.",
""
],
[
"Kanik",
"I.",
""
],
[
"Savci",
"M.",
""
]
] | The magnetic moment $\mu$ of the "rho" meson is studied in QCD light cone sum rules, and it is found that "mu = (2.3 pm 0.5)". A comparison of our result on the magnetic moment of the "rho" meson with the predictions of the other approaches, is presented. |
2312.05071 | Joydeep Roy | Md Isha Ali, Utpal Chattopadhyay, N Rajeev and Joydeep Roy | SMEFT analysis of charged lepton flavor violating $B$-meson decays | Feynman diagram is updated. No change in text or results with respect
to the journal version | Phys.Rev.D 109 (2024) 7, 075028 | 10.1103/PhysRevD.109.075028 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Charged lepton flavor violation (cLFV) processes, potentially important for
various Beyond the Standard Model Physics scenarios are analyzed in the
Standard Model Effective Field Theory (SMEFT) framework. We consider the most
relevant 2 quark-2 lepton $(2q2\ell)$ operators for the leptonic and
semi-leptonic LFV B-decay (LFVBD) processes $B_s\to \mu^+e^- , B^+\to
K^+\mu^+e^-, B^0\to K^{*0}\mu^+ e^-, {\rm and}~ B_s\to \phi\mu^-e^+$. We
analyse the interplay among the Wilson coefficients responsible for these
LFVBDs and other cLFV processes like $\rm CR (\mu\to e)$, $\ell_i \to \ell_j
\gamma$, $\ell_i \to\ell_j\ell_k\ell_m$ and $Z \to \ell_i \ell_j$, to find the
maximal possible LFV effects in $B$-meson decays. We probe the scale of new
physics in relation to the constraints imposed by both classes of the LFV
decays while considering both the present bounds and future expectations. In
view of proposed experiments at LHCb-II and Belle II to study charged LFV
processes, we have also provided the upper limits on the indirect constraints
on such LFVBDs. For the processes where $B$ meson is decaying to $\mu^{\pm}$
and $e^{\mp}$, we show that new physics can be constrained by an enhancement of
2-4 orders of magnitude on the current sensitivities of the BRs of $B^+\to
K^+\mu^+e^-, B^0\to K^{*0}\mu^+ e^- {\rm and}~ B_s\to\phi\mu^{\pm}e^{\mp}$.
| [
{
"created": "Fri, 8 Dec 2023 14:44:56 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Apr 2024 05:26:56 GMT",
"version": "v2"
},
{
"created": "Wed, 17 Jul 2024 07:24:26 GMT",
"version": "v3"
}
] | 2024-07-18 | [
[
"Ali",
"Md Isha",
""
],
[
"Chattopadhyay",
"Utpal",
""
],
[
"Rajeev",
"N",
""
],
[
"Roy",
"Joydeep",
""
]
] | Charged lepton flavor violation (cLFV) processes, potentially important for various Beyond the Standard Model Physics scenarios are analyzed in the Standard Model Effective Field Theory (SMEFT) framework. We consider the most relevant 2 quark-2 lepton $(2q2\ell)$ operators for the leptonic and semi-leptonic LFV B-decay (LFVBD) processes $B_s\to \mu^+e^- , B^+\to K^+\mu^+e^-, B^0\to K^{*0}\mu^+ e^-, {\rm and}~ B_s\to \phi\mu^-e^+$. We analyse the interplay among the Wilson coefficients responsible for these LFVBDs and other cLFV processes like $\rm CR (\mu\to e)$, $\ell_i \to \ell_j \gamma$, $\ell_i \to\ell_j\ell_k\ell_m$ and $Z \to \ell_i \ell_j$, to find the maximal possible LFV effects in $B$-meson decays. We probe the scale of new physics in relation to the constraints imposed by both classes of the LFV decays while considering both the present bounds and future expectations. In view of proposed experiments at LHCb-II and Belle II to study charged LFV processes, we have also provided the upper limits on the indirect constraints on such LFVBDs. For the processes where $B$ meson is decaying to $\mu^{\pm}$ and $e^{\mp}$, we show that new physics can be constrained by an enhancement of 2-4 orders of magnitude on the current sensitivities of the BRs of $B^+\to K^+\mu^+e^-, B^0\to K^{*0}\mu^+ e^- {\rm and}~ B_s\to\phi\mu^{\pm}e^{\mp}$. |
1308.1782 | Guey-Lin Lin | Fei-Fan Lee, Guey-Lin Lin and Yue-Lin Sming Tsai | Constraining dark matter capture and annihilation cross sections by
searching for neutrino signature from the Earth core | 23 pages, 8 figures | Phys. Rev. D 89, 025003 (2014) | 10.1103/PhysRevD.89.025003 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the sensitivity of IceCube/DeepCore detector to dark matter
annihilations in the Earth core. We focus on annihilation modes $\chi\chi\to
\nu \bar{\nu}, \, \tau^+ \tau^-, \, b \bar{b}$, and $W^+W^-$. Both track and
cascade events are considered in our analysis. By fixing the dark matter
annihilation cross section $\langle \sigma\upsilon\rangle$ at some nominal
values, we study the sensitivity of IceCube/DeepCore detector to dark matter
spin-independent cross section $\sigma_p^{\rm SI}$ for $m_{\chi}$ ranging from
few tens of GeV to 10 TeV. This sensitivity is compared with the existing
IceCube 79-string constraint on the same cross section, which was obtained by
searching for dark matter annihilations in the Sun. We compare this sensitivity
to dark matter direct detection results as well, in particular the XENON100
(2012) limit and the parameter regions preferred by DAMA and CRESST-II
experiments. We also present IceCube/DeepCore sensitivity to $\langle
\sigma\upsilon \rangle$ as a function of $m_{\chi}$ by fixing $\sigma_p^{\rm
SI}$ at XENON100 (2012) and XENON1T limits, respectively. This sensitivity is
compared with the preferred dark matter parameter range derived from the
combined fitting to PAMELA and AMS02 positron fraction data. We conclude that
the search for dark matter annihilations in the Earth core provides competitive
constraints on $\sigma_p^{\rm SI}$ and $\langle \sigma\upsilon \rangle$ in the
case of low-mass dark matter. Particularly, the expected constraint on
$\sigsip$ for 5 years of data taking in IceCube/DeepCore is more stringent than
the current IceCube 79-string limit mentioned above.
| [
{
"created": "Thu, 8 Aug 2013 08:31:49 GMT",
"version": "v1"
}
] | 2014-01-15 | [
[
"Lee",
"Fei-Fan",
""
],
[
"Lin",
"Guey-Lin",
""
],
[
"Tsai",
"Yue-Lin Sming",
""
]
] | We study the sensitivity of IceCube/DeepCore detector to dark matter annihilations in the Earth core. We focus on annihilation modes $\chi\chi\to \nu \bar{\nu}, \, \tau^+ \tau^-, \, b \bar{b}$, and $W^+W^-$. Both track and cascade events are considered in our analysis. By fixing the dark matter annihilation cross section $\langle \sigma\upsilon\rangle$ at some nominal values, we study the sensitivity of IceCube/DeepCore detector to dark matter spin-independent cross section $\sigma_p^{\rm SI}$ for $m_{\chi}$ ranging from few tens of GeV to 10 TeV. This sensitivity is compared with the existing IceCube 79-string constraint on the same cross section, which was obtained by searching for dark matter annihilations in the Sun. We compare this sensitivity to dark matter direct detection results as well, in particular the XENON100 (2012) limit and the parameter regions preferred by DAMA and CRESST-II experiments. We also present IceCube/DeepCore sensitivity to $\langle \sigma\upsilon \rangle$ as a function of $m_{\chi}$ by fixing $\sigma_p^{\rm SI}$ at XENON100 (2012) and XENON1T limits, respectively. This sensitivity is compared with the preferred dark matter parameter range derived from the combined fitting to PAMELA and AMS02 positron fraction data. We conclude that the search for dark matter annihilations in the Earth core provides competitive constraints on $\sigma_p^{\rm SI}$ and $\langle \sigma\upsilon \rangle$ in the case of low-mass dark matter. Particularly, the expected constraint on $\sigsip$ for 5 years of data taking in IceCube/DeepCore is more stringent than the current IceCube 79-string limit mentioned above. |
1812.07823 | Ibragim Alikhanov | I. Alikhanov | Charged lepton beams as a source of effective neutrinos | 6 pages, 7 figures. Extended discussion. The title is modified to be
more informative. Matches published version | EPL 129 (2020) 11003 | 10.1209/0295-5075/129/11003 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Neutrinos are likely the most poorly understood basic constituents of the
Standard Model. In order to investigate precisely their interactions one should
be able to create high intensity and well-collimated neutrino beams with known
flavor compositions. This is a challenging problem for neutrino experiments. We
propose a method of studying neutrino interactions based on the fact that a
charged lepton is able to manifest itself effectively, with a certain
probability, as a neutrino. The effective neutrino method may provide an
additional tool for probing neutrino-induced reactions at $e^+e^-$ and $ep$
colliders as well as at other facilities that use charged lepton beams. We
derive the distributions of the effective neutrinos in the charged leptons and
give examples of application of the method to electron-positron collisions.
| [
{
"created": "Wed, 19 Dec 2018 09:09:30 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Feb 2020 18:11:55 GMT",
"version": "v2"
}
] | 2020-02-13 | [
[
"Alikhanov",
"I.",
""
]
] | Neutrinos are likely the most poorly understood basic constituents of the Standard Model. In order to investigate precisely their interactions one should be able to create high intensity and well-collimated neutrino beams with known flavor compositions. This is a challenging problem for neutrino experiments. We propose a method of studying neutrino interactions based on the fact that a charged lepton is able to manifest itself effectively, with a certain probability, as a neutrino. The effective neutrino method may provide an additional tool for probing neutrino-induced reactions at $e^+e^-$ and $ep$ colliders as well as at other facilities that use charged lepton beams. We derive the distributions of the effective neutrinos in the charged leptons and give examples of application of the method to electron-positron collisions. |
2106.01916 | Anatoly Radyushkin | I. Balitsky, W. Morris and A. Radyushkin | Gluon pseudo-distributions at short distances | Talk given by W. Morris at XXVIII International Workshop on
Deep-Inelastic Scattering and Related Subjects (DIS2021) | null | null | JLAB-THY-21-3413 | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the results that are necessary in the ongoing lattice calculations
of the gluon parton distribution functions (PDFs) within the pseudo-PDF
approach. We identify the two-gluon correlator functions that contain the
invariant amplitude determining the gluon PDF in the light-cone $z^2 \to 0$
limit, and perform one-loop calculations in the coordinate representation in an
explicitly gauge-invariant form. Ultraviolet (UV) terms, which contain $\ln
(-z^2)$-dependence cancel in the reduced Ioffe-time distribution (ITD), and we
obtain the matching relation between the reduced ITD and the light-cone ITD.
Using a kernel form, we get a direct connection between lattice data for the
reduced ITD and the normalized gluon PDF.
| [
{
"created": "Thu, 3 Jun 2021 15:08:27 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Jul 2021 12:56:10 GMT",
"version": "v2"
}
] | 2021-07-20 | [
[
"Balitsky",
"I.",
""
],
[
"Morris",
"W.",
""
],
[
"Radyushkin",
"A.",
""
]
] | We present the results that are necessary in the ongoing lattice calculations of the gluon parton distribution functions (PDFs) within the pseudo-PDF approach. We identify the two-gluon correlator functions that contain the invariant amplitude determining the gluon PDF in the light-cone $z^2 \to 0$ limit, and perform one-loop calculations in the coordinate representation in an explicitly gauge-invariant form. Ultraviolet (UV) terms, which contain $\ln (-z^2)$-dependence cancel in the reduced Ioffe-time distribution (ITD), and we obtain the matching relation between the reduced ITD and the light-cone ITD. Using a kernel form, we get a direct connection between lattice data for the reduced ITD and the normalized gluon PDF. |
hep-ph/9905391 | Chip Brock/msu/353-1693 | F.Landry, R.Brock, G.Ladinsky, and C.-P.Yuan | New Fits for the Non-Perturbative Parameters in the CSS Resummation
Formalism | 22 pages, 12 figures, LaTeX | Phys.Rev.D63:013004,2001 | 10.1103/PhysRevD.63.013004 | CTEQ-904 | hep-ph | null | We update the non-perturbative function of the Collins-Soper- Sterman
resummation formalism in hadron collisions. Two functional forms in impact
parameter space are considered, one with a pure Gaussian form with two
parameters and the other with an additional linear term. The results for the
two parameter fit are found to be g1=0.24+0.08-0.07 GeV^2, g2=0.34+0.07-0.08
GeV^2. The results for the three parameter fit are g1=0.15+004-0.03 GeV^2,
g2=0.48+0.07-0.05 GeV^2, and g3=-0.58+0.26-0.20 GeV^-1. We discuss the
potential for the full Tevatron Run I Z boson data for further testing of the
universality of the non-perturbative function.
| [
{
"created": "Tue, 18 May 1999 21:33:35 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Landry",
"F.",
""
],
[
"Brock",
"R.",
""
],
[
"Ladinsky",
"G.",
""
],
[
"Yuan",
"C. -P.",
""
]
] | We update the non-perturbative function of the Collins-Soper- Sterman resummation formalism in hadron collisions. Two functional forms in impact parameter space are considered, one with a pure Gaussian form with two parameters and the other with an additional linear term. The results for the two parameter fit are found to be g1=0.24+0.08-0.07 GeV^2, g2=0.34+0.07-0.08 GeV^2. The results for the three parameter fit are g1=0.15+004-0.03 GeV^2, g2=0.48+0.07-0.05 GeV^2, and g3=-0.58+0.26-0.20 GeV^-1. We discuss the potential for the full Tevatron Run I Z boson data for further testing of the universality of the non-perturbative function. |
1311.6579 | Georg Engel | Georg P. Engel, C.B. Lang, Daniel Mohler, Andreas Sch\"afer | Excited light and strange hadrons from the lattice with two Chirally
Improved quarks | Contribution to the XV International Conference on Hadron
Spectroscopy "Hadron 2013", 4-8 November 2013, Nara, Japan | PoS Hadron 2013 (2013) 118 | null | FERMILAB-CONF-13-524-T | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Results for excited light and strange hadrons from the lattice with two
flavors of Chirally Improved sea quarks are presented. We perform simulations
at several values of the pion mass ranging from 250 to 600 MeV and extrapolate
to the physical pion mass. The variational method is applied to extract excited
energy levels but also to discuss the content of the states. Among others, we
explore the flavor singlet/octet content of Lambda states. In general, our
results agree well with experiment, in particular we confirm the Lambda(1405)
and its dominant flavor singlet structure.
| [
{
"created": "Tue, 26 Nov 2013 07:58:03 GMT",
"version": "v1"
}
] | 2014-06-02 | [
[
"Engel",
"Georg P.",
""
],
[
"Lang",
"C. B.",
""
],
[
"Mohler",
"Daniel",
""
],
[
"Schäfer",
"Andreas",
""
]
] | Results for excited light and strange hadrons from the lattice with two flavors of Chirally Improved sea quarks are presented. We perform simulations at several values of the pion mass ranging from 250 to 600 MeV and extrapolate to the physical pion mass. The variational method is applied to extract excited energy levels but also to discuss the content of the states. Among others, we explore the flavor singlet/octet content of Lambda states. In general, our results agree well with experiment, in particular we confirm the Lambda(1405) and its dominant flavor singlet structure. |
1305.5320 | Run-Hui Li | C.S. Kim, Run-Hui Li, Wei Wang | $B\to DK^*_{0,2}$ Decays: PQCD analysis to determine CP violation phase
angle $\gamma$ | 7 pages, 2 figures | null | 10.1103/PhysRevD.88.034003 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | $B^\pm \to (D^0, \bar D^0, D_{CP})K^{*\pm}_{0,2}$ decays are helpful in
determining the CP violation angle $\gamma$, and we analyze these decay
processes within the perturbative QCD approach based on $k_T$ factorization. We
found that the branching ratio of $B^-\to D^0 K^{*-}_0$ can reach the order of
$10^{-4}$, due to the enhancement of nonfactorizable contributions in
color-suppressed $D^0$-emission, while the branching ratio of $B^-\to \bar D^0
K^{*-}_0$ is of the order $10^{-5}$. The ratio of decay amplitudes is about 3
times larger than the one in the channel $B^\pm\to D K^\pm$. Large branching
ratios provide a good opportunity to observe $ B^\pm \to D K^{*\pm}_2$ on the
ongoing and forthcoming experimental facilities and consequently these channels
may be of valuable avail in reducing the errors in the CP violation phase angle
$\gamma$. We also explore the possible time-dependent CP asymmetries of $B_s$
decay into a scalar meson to determine the phase angle $\gamma$.
| [
{
"created": "Thu, 23 May 2013 05:57:20 GMT",
"version": "v1"
}
] | 2013-08-09 | [
[
"Kim",
"C. S.",
""
],
[
"Li",
"Run-Hui",
""
],
[
"Wang",
"Wei",
""
]
] | $B^\pm \to (D^0, \bar D^0, D_{CP})K^{*\pm}_{0,2}$ decays are helpful in determining the CP violation angle $\gamma$, and we analyze these decay processes within the perturbative QCD approach based on $k_T$ factorization. We found that the branching ratio of $B^-\to D^0 K^{*-}_0$ can reach the order of $10^{-4}$, due to the enhancement of nonfactorizable contributions in color-suppressed $D^0$-emission, while the branching ratio of $B^-\to \bar D^0 K^{*-}_0$ is of the order $10^{-5}$. The ratio of decay amplitudes is about 3 times larger than the one in the channel $B^\pm\to D K^\pm$. Large branching ratios provide a good opportunity to observe $ B^\pm \to D K^{*\pm}_2$ on the ongoing and forthcoming experimental facilities and consequently these channels may be of valuable avail in reducing the errors in the CP violation phase angle $\gamma$. We also explore the possible time-dependent CP asymmetries of $B_s$ decay into a scalar meson to determine the phase angle $\gamma$. |
1210.4225 | Francesco Vissani | Giulia Pagliaroli, Carolina Lujan-Peschard, Manimala Mitra, Francesco
Vissani | Neutrinos from Pion Decay at Rest to Probe the Proton Strangeness in an
Underground Lab | Version accepted in PRL. Title and discussion improved | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The study of the neutral current elastic scattering of neutrinos on protons
at lower energies can be used as a compelling probe to improve our knowledge of
the strangeness of the proton. We consider a neutrino beam generated from pion
decay at rest, as provided by a cyclotron or a spallation neutron source and a
1 kton scintillating detector with a potential similar to the Borexino
detector. Despite several backgrounds from solar and radioactive sources it is
possible to estimate two optimal energy windows for the analysis, one between
0.65-1.1 MeV and another between 1.73-2.2 MeV. The expected number of neutral
current events in these two regions, for an exposure of 1 year, is enough to
obtain an error on the strange axial-charge 10 times smaller than available at
present.
| [
{
"created": "Tue, 16 Oct 2012 00:52:05 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Jun 2013 14:51:27 GMT",
"version": "v2"
}
] | 2013-06-13 | [
[
"Pagliaroli",
"Giulia",
""
],
[
"Lujan-Peschard",
"Carolina",
""
],
[
"Mitra",
"Manimala",
""
],
[
"Vissani",
"Francesco",
""
]
] | The study of the neutral current elastic scattering of neutrinos on protons at lower energies can be used as a compelling probe to improve our knowledge of the strangeness of the proton. We consider a neutrino beam generated from pion decay at rest, as provided by a cyclotron or a spallation neutron source and a 1 kton scintillating detector with a potential similar to the Borexino detector. Despite several backgrounds from solar and radioactive sources it is possible to estimate two optimal energy windows for the analysis, one between 0.65-1.1 MeV and another between 1.73-2.2 MeV. The expected number of neutral current events in these two regions, for an exposure of 1 year, is enough to obtain an error on the strange axial-charge 10 times smaller than available at present. |
1407.7044 | Rodrigo Alonso Dr | Rodrigo Alonso, Benjamin Grinstein and Jorge Martin Camalich | $SU(2)\times U(1)$ gauge invariance and the shape of new physics in rare
$B$ decays | 5pages, 1 figure | Phys. Rev. Lett. 113, 241802 (2014) | 10.1103/PhysRevLett.113.241802 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | New physics effects in $B$ decays are routinely modeled through operators
invariant under the strong and electromagnetic gauge symmetries. Assuming the
scale for new physics is well above the electro-weak scale, we further require
invariance under the full Standard-Model gauge symmetry group. Retaining up to
dimension-6 operators, we unveil new constraints between different new-physics
operators that are assumed to be independent in the standard phenomenological
analyses. We illustrate this approach by analyzing the constraints on new
physics from rare $B_{q}$ (semi-)leptonic decays.
| [
{
"created": "Fri, 25 Jul 2014 20:07:48 GMT",
"version": "v1"
}
] | 2014-12-17 | [
[
"Alonso",
"Rodrigo",
""
],
[
"Grinstein",
"Benjamin",
""
],
[
"Camalich",
"Jorge Martin",
""
]
] | New physics effects in $B$ decays are routinely modeled through operators invariant under the strong and electromagnetic gauge symmetries. Assuming the scale for new physics is well above the electro-weak scale, we further require invariance under the full Standard-Model gauge symmetry group. Retaining up to dimension-6 operators, we unveil new constraints between different new-physics operators that are assumed to be independent in the standard phenomenological analyses. We illustrate this approach by analyzing the constraints on new physics from rare $B_{q}$ (semi-)leptonic decays. |
hep-ph/9410406 | Hubert Simma | G. Kramer, W.F. Palmer, H. Simma | CP Violation and Strong Phases from Penguins in $\bf B^{\pm}\rightarrow
PP$ and $\bf B^{\pm}\rightarrow VP$ Decays | 19 pages, 4 figures (3 available as uuencoded ps-files), LaTeX,
preprint DESY 94-170 | Z.Phys.C66:429-438,1995 | 10.1007/BF01556369 | null | hep-ph | null | We calculate direct CP-violating rate asymmetries in charged $B\to PP$ and
$B\to VP$ decays arising from the interference of amplitudes with different
strong and CKM phases. The perturbative strong phases develop at order
$\alpha_s$ from absorptive parts of one-loop matrix elements of the
next-to-leading logarithm corrected effective Hamiltonian. CPT constraints are
maintained. Based on this model, we find that partial rate asymmetries between
charge conjugate $B^{\pm}$ decays can be as high as 20\% for certain channels
with branching ratios in the $10^{-6}$ range. Because the $c\bar{c}$ threshold
lies so close to the physical momentum scale, the asymmetries depend
sensitively on the model assumptions used to evaluate the imaginary parts of
the matrix elements, in particular, on the internal momentum transfer. The
charge asymmetries of partial rates would provide unambiguous evidence for
direct CP violation.
| [
{
"created": "Sun, 30 Oct 1994 18:56:44 GMT",
"version": "v1"
},
{
"created": "Mon, 31 Oct 1994 11:51:03 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Kramer",
"G.",
""
],
[
"Palmer",
"W. F.",
""
],
[
"Simma",
"H.",
""
]
] | We calculate direct CP-violating rate asymmetries in charged $B\to PP$ and $B\to VP$ decays arising from the interference of amplitudes with different strong and CKM phases. The perturbative strong phases develop at order $\alpha_s$ from absorptive parts of one-loop matrix elements of the next-to-leading logarithm corrected effective Hamiltonian. CPT constraints are maintained. Based on this model, we find that partial rate asymmetries between charge conjugate $B^{\pm}$ decays can be as high as 20\% for certain channels with branching ratios in the $10^{-6}$ range. Because the $c\bar{c}$ threshold lies so close to the physical momentum scale, the asymmetries depend sensitively on the model assumptions used to evaluate the imaginary parts of the matrix elements, in particular, on the internal momentum transfer. The charge asymmetries of partial rates would provide unambiguous evidence for direct CP violation. |
hep-ph/9812411 | Stefan Dittmaier | A. Denner and S. Dittmaier | Production of Light Fermion-Antifermion Pairs in gamma gamma Collisions | 19 pages, latex, 7 postscript figures | Eur.Phys.J.C9:425-435,1999 | 10.1007/s100529900049 | CERN-TH/98-335, PSI-PR-98-28 | hep-ph | null | The $O(\alpha)$ corrections to $\gamma\gamma --> f \bar f$ in the Standard
Model are calculated for arbitrary, light fermions $f$. The relevant analytical
results are listed in a form that is appropriate for practical applications,
and numerical results for integrated cross sections are discussed. The
corresponding QED corrections are generally of the order of some per mille for
arbitrary energies. The weak corrections to $\gamma\gamma --> e^-e^+$ are
negligible below the electroweak scale, reach the per-cent level at a few
hundred GeV and grow to about -10% at 2TeV. The weak corrections to $u \bar u$
and $d \bar d$ production have a shape similar to the one for $e^-e^+$, but
they are larger by factors $\sim 1.4$ and $\sim 3$, respectively.
| [
{
"created": "Thu, 17 Dec 1998 13:39:16 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Denner",
"A.",
""
],
[
"Dittmaier",
"S.",
""
]
] | The $O(\alpha)$ corrections to $\gamma\gamma --> f \bar f$ in the Standard Model are calculated for arbitrary, light fermions $f$. The relevant analytical results are listed in a form that is appropriate for practical applications, and numerical results for integrated cross sections are discussed. The corresponding QED corrections are generally of the order of some per mille for arbitrary energies. The weak corrections to $\gamma\gamma --> e^-e^+$ are negligible below the electroweak scale, reach the per-cent level at a few hundred GeV and grow to about -10% at 2TeV. The weak corrections to $u \bar u$ and $d \bar d$ production have a shape similar to the one for $e^-e^+$, but they are larger by factors $\sim 1.4$ and $\sim 3$, respectively. |
hep-ph/9509360 | Marcello Lissia | Suzhou Huang and Marcello Lissia | Contrasting Real-time Dynamics with Screening Phenomena at Finite
Temperature | 27 pages, ReVTeX, plus 7 postscript figures. Accepted for publication
in Physical Review D | Phys.Rev.D53:7270-7285,1996 | 10.1103/PhysRevD.53.7270 | MIT-CTP 2359 and INFNCA-TH-94-9 | hep-ph hep-lat hep-th nucl-th | null | We discuss the interpretation of Euclidean correlation functions at finite
temperature ($T$) and their relationship with the corresponding real-time
Green's functions. The soluble 2+1 dimensional Gross-Neveu model in the
large-$N$ limit is used throughout as a working example. First, the real-time
bound state, identified as an elementary excitation at finite $T$, is solved.
The bound state mass, the dispersion relation at low momenta, the coupling
constant and decay constant are calculated. To characterize the structure of
the bound state the on-shell form factor is carefully introduced and
calculated. Then we examine the corresponding screening state and contrast the
screening mass, coupling constant, decay constant and the screening
Bethe-Salpeter amplitude with the real-time quantities. We find that, although
they can be used as qualitative indicators in the low-$T$ regime, the screening
states at finite $T$ in general do not reflect the properties of the
corresponding real-time bound states. Besides, other relevant issues, such as
the subtlety of the real-time manifestation of conservation laws due to some
internal symmetries at $T\ne 0$, the temperature dependence of the pseudoscalar
spectral function and its sum rule, and the high-$T$ limit of the screening
state and its implications to the dimensional reduction, are also discussed in
detail.
| [
{
"created": "Fri, 22 Sep 1995 09:51:35 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Oct 1995 15:09:44 GMT",
"version": "v2"
},
{
"created": "Wed, 21 Feb 1996 09:47:45 GMT",
"version": "v3"
}
] | 2011-01-04 | [
[
"Huang",
"Suzhou",
""
],
[
"Lissia",
"Marcello",
""
]
] | We discuss the interpretation of Euclidean correlation functions at finite temperature ($T$) and their relationship with the corresponding real-time Green's functions. The soluble 2+1 dimensional Gross-Neveu model in the large-$N$ limit is used throughout as a working example. First, the real-time bound state, identified as an elementary excitation at finite $T$, is solved. The bound state mass, the dispersion relation at low momenta, the coupling constant and decay constant are calculated. To characterize the structure of the bound state the on-shell form factor is carefully introduced and calculated. Then we examine the corresponding screening state and contrast the screening mass, coupling constant, decay constant and the screening Bethe-Salpeter amplitude with the real-time quantities. We find that, although they can be used as qualitative indicators in the low-$T$ regime, the screening states at finite $T$ in general do not reflect the properties of the corresponding real-time bound states. Besides, other relevant issues, such as the subtlety of the real-time manifestation of conservation laws due to some internal symmetries at $T\ne 0$, the temperature dependence of the pseudoscalar spectral function and its sum rule, and the high-$T$ limit of the screening state and its implications to the dimensional reduction, are also discussed in detail. |
hep-ph/9412239 | "V. A." Khoze | Valery A. Khoze | Chromo- and Electrodynamics of Heavy Unstable Particle | 28 pages, LATEX, figures are not included (the hard copies are
available from the Author) | Surveys High Energ.Phys.11:145-167,1997 | null | DTP/94-114 | hep-ph | null | In this talk I attempt to survey some selected physics issues on radiative
interference phenomena in the production of heavy unstable particles. A special
emphasis is placed on the reactions $e^+e^- \rightarrow W^+W^- \rightarrow 4$
jets and $e^+e^- \rightarrow t\bar{t} \rightarrow bW^+\bar{b}W^-$. A
transparent recipe is given for quantifying the level of suppression of the
interference effects in the inclusive production processes. The influence of
the $W$ width on the Coulomb corrections to the threshold $W^+W^-$ production
is briefly addressed.
| [
{
"created": "Mon, 5 Dec 1994 15:45:54 GMT",
"version": "v1"
}
] | 2011-03-02 | [
[
"Khoze",
"Valery A.",
""
]
] | In this talk I attempt to survey some selected physics issues on radiative interference phenomena in the production of heavy unstable particles. A special emphasis is placed on the reactions $e^+e^- \rightarrow W^+W^- \rightarrow 4$ jets and $e^+e^- \rightarrow t\bar{t} \rightarrow bW^+\bar{b}W^-$. A transparent recipe is given for quantifying the level of suppression of the interference effects in the inclusive production processes. The influence of the $W$ width on the Coulomb corrections to the threshold $W^+W^-$ production is briefly addressed. |
2108.03262 | Francesco Capozzi | Francesco Capozzi, Bhaskar Dutta, Gajendra Gurung, Wooyoung Jang, Ian
M. Shoemaker, Adrian Thompson, Jaehoon Yu | Extending the Reach of Leptophilic Boson Searches at DUNE and MiniBooNE
with Bremsstrahlung and Resonant Production | 10 pages, 4 figures | null | 10.1103/PhysRevD.104.115010 | MI-HET-752 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | New gauge bosons coupling to leptons are simple and well-motivated extensions
of the Standard Model. We study the sensitivity to gauged $L_{\mu} -L_{e}$,
$L_e-L_\tau$ and $L_{\mu} -L_{\tau}$ both with the existing beam dump mode data
of MiniBooNE and with the DUNE near detector. We find that including
bremsstrahlung and resonant production of $Z'$ which decays to $e^{\pm}$ and
$\mu^{\pm}$ final states leads to a significant improvement in existing bounds,
especially for $L_\mu-L_e$ and $L_e-L_\tau$ for DUNE while competitive
constraints can be achieved with the existing data from the MiniBooNE's beam
dump run.
| [
{
"created": "Fri, 6 Aug 2021 18:17:41 GMT",
"version": "v1"
}
] | 2021-12-22 | [
[
"Capozzi",
"Francesco",
""
],
[
"Dutta",
"Bhaskar",
""
],
[
"Gurung",
"Gajendra",
""
],
[
"Jang",
"Wooyoung",
""
],
[
"Shoemaker",
"Ian M.",
""
],
[
"Thompson",
"Adrian",
""
],
[
"Yu",
"Jaehoon",
""
]
] | New gauge bosons coupling to leptons are simple and well-motivated extensions of the Standard Model. We study the sensitivity to gauged $L_{\mu} -L_{e}$, $L_e-L_\tau$ and $L_{\mu} -L_{\tau}$ both with the existing beam dump mode data of MiniBooNE and with the DUNE near detector. We find that including bremsstrahlung and resonant production of $Z'$ which decays to $e^{\pm}$ and $\mu^{\pm}$ final states leads to a significant improvement in existing bounds, especially for $L_\mu-L_e$ and $L_e-L_\tau$ for DUNE while competitive constraints can be achieved with the existing data from the MiniBooNE's beam dump run. |
2207.09420 | Andrei Poblaguev | A. A. Poblaguev | Feasibility study for precisely measuring the EIC ${}^3$He beam
polarization with the Polarized Atomic Hydrogen Gas Jet Target polarimeter at
RHIC | 8 pages, 2 figures | Phys. Rev. C 106, 065202 (2022) | 10.1103/PhysRevC.106.065202 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The Polarized Atomic Hydrogen Gas Jet Target polarimeter (HJET) is used to
measure the absolute proton beam polarization,
$\sigma_P^\text{syst}/P\!\lesssim\!0.5\%$, at the Relativistic Heavy Ion
Collider. Here I consider the possibility of employing HJET to measure the
${}^3\text{He}$ ($h$) beam polarization at the Electron-Ion Collider (EIC). The
dominant contribution to the ratio of the $h^\uparrow{p}$ and $p^\uparrow{h}$
analyzing powers, which is needed for such measurements, can be easily
calculated using well-known values of the proton and helion magnetic moments,
but some corrections should be applied to achieve the required accuracy. It was
found that corrections due to absorption and ${}^3\text{He}$ breakup
effectively cancel in the ratio and a correction due to hadronic spin-flip
amplitudes can be derived from the proton beam measurements. As a result, the
anticipated systematic uncertainty in the measured ${}^3\text{He}$ beam
polarization can satisfy the EIC requirement
$\sigma_P^\text{syst}/P\!\lesssim\!1\%$.
| [
{
"created": "Tue, 19 Jul 2022 17:28:14 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Dec 2022 17:32:37 GMT",
"version": "v2"
}
] | 2022-12-13 | [
[
"Poblaguev",
"A. A.",
""
]
] | The Polarized Atomic Hydrogen Gas Jet Target polarimeter (HJET) is used to measure the absolute proton beam polarization, $\sigma_P^\text{syst}/P\!\lesssim\!0.5\%$, at the Relativistic Heavy Ion Collider. Here I consider the possibility of employing HJET to measure the ${}^3\text{He}$ ($h$) beam polarization at the Electron-Ion Collider (EIC). The dominant contribution to the ratio of the $h^\uparrow{p}$ and $p^\uparrow{h}$ analyzing powers, which is needed for such measurements, can be easily calculated using well-known values of the proton and helion magnetic moments, but some corrections should be applied to achieve the required accuracy. It was found that corrections due to absorption and ${}^3\text{He}$ breakup effectively cancel in the ratio and a correction due to hadronic spin-flip amplitudes can be derived from the proton beam measurements. As a result, the anticipated systematic uncertainty in the measured ${}^3\text{He}$ beam polarization can satisfy the EIC requirement $\sigma_P^\text{syst}/P\!\lesssim\!1\%$. |
1510.04859 | Jesper Roy Christiansen | Jesper R. Christiansen | Colour Reconnection - Models and Tests | 6 pages, 5 figures. To appear in the proceedings of the The European
Physical Society Conference on High Energy Physics, 22-29 July 2015 in
Vienna, Austria | null | null | LU-TP 15-45, MCNET-15-29 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent progress on colour reconnection within the Pythia framework is
presented. A new model is introduced, based on the SU(3) structure of QCD and a
minimization of the potential string energy. The inclusion of the epsilon
structure of SU(3) gives a new baryon production mechanism and makes it
possible simultaneously to describe hyperon production at both $e^+e^-$ and pp
colliders. Finally, predictions for $e^+e^-$ colliders, both past and potential
future ones, are presented.
| [
{
"created": "Fri, 16 Oct 2015 12:15:47 GMT",
"version": "v1"
}
] | 2015-10-19 | [
[
"Christiansen",
"Jesper R.",
""
]
] | Recent progress on colour reconnection within the Pythia framework is presented. A new model is introduced, based on the SU(3) structure of QCD and a minimization of the potential string energy. The inclusion of the epsilon structure of SU(3) gives a new baryon production mechanism and makes it possible simultaneously to describe hyperon production at both $e^+e^-$ and pp colliders. Finally, predictions for $e^+e^-$ colliders, both past and potential future ones, are presented. |
1612.03176 | Ennio Salvioni | Hsin-Chia Cheng, Ennio Salvioni, Yuhsin Tsai | Exotic Electroweak Signals in Twin Higgs | 36 pages, 9 figures; v2: version published in PRD, a few discussions
extended to address referee's comments. References added | Phys. Rev. D 95, 115035 (2017) | 10.1103/PhysRevD.95.115035 | TUM-HEP-1073-16 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Twin Higgs model is the preeminent example of a theory of neutral
naturalness, where the new particles that alleviate the little hierarchy
problem are Standard Model (SM) singlets. The most promising collider search
strategy, based on rare Higgs decays, is nevertheless not effective in
significant regions of the parameter space of the low energy theory. This
underlines the importance of phenomenological studies on ultraviolet
completions of the Twin Higgs model, which must lie at a scale lower than 5-10
TeV. We pursue this course in the context of non-supersymmetric completions,
focusing on exotic fermions that carry SM electroweak and twin color charges,
as well as on exotic vectors that transform as the bi-fundamental of the
electroweak or color groups. Both $Z_2$-preserving and $Z_2$-breaking mass
spectra are considered for the exotic fermions. In the former case they must be
heavier than $\sim 1$ TeV, but can still be sizably produced in the decays of
the color bi-fundamental vector. In the $Z_2$-breaking scenario, the exotic
fermions can have masses in the few hundred GeV range without significantly
increasing the fine-tuning. Once pair-produced through the electroweak
interactions, they naturally form bound states held together by the twin color
force, which subsequently annihilate back to SM particles. The associated
resonance signals are discussed in detail. We also outline the phenomenology of
the electroweak bi-fundamental vectors, some of which mix with the SM $W$ and
$Z$ and can therefore be singly produced in hadron collisions.
| [
{
"created": "Fri, 9 Dec 2016 21:00:01 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Jul 2017 17:15:45 GMT",
"version": "v2"
}
] | 2017-07-05 | [
[
"Cheng",
"Hsin-Chia",
""
],
[
"Salvioni",
"Ennio",
""
],
[
"Tsai",
"Yuhsin",
""
]
] | The Twin Higgs model is the preeminent example of a theory of neutral naturalness, where the new particles that alleviate the little hierarchy problem are Standard Model (SM) singlets. The most promising collider search strategy, based on rare Higgs decays, is nevertheless not effective in significant regions of the parameter space of the low energy theory. This underlines the importance of phenomenological studies on ultraviolet completions of the Twin Higgs model, which must lie at a scale lower than 5-10 TeV. We pursue this course in the context of non-supersymmetric completions, focusing on exotic fermions that carry SM electroweak and twin color charges, as well as on exotic vectors that transform as the bi-fundamental of the electroweak or color groups. Both $Z_2$-preserving and $Z_2$-breaking mass spectra are considered for the exotic fermions. In the former case they must be heavier than $\sim 1$ TeV, but can still be sizably produced in the decays of the color bi-fundamental vector. In the $Z_2$-breaking scenario, the exotic fermions can have masses in the few hundred GeV range without significantly increasing the fine-tuning. Once pair-produced through the electroweak interactions, they naturally form bound states held together by the twin color force, which subsequently annihilate back to SM particles. The associated resonance signals are discussed in detail. We also outline the phenomenology of the electroweak bi-fundamental vectors, some of which mix with the SM $W$ and $Z$ and can therefore be singly produced in hadron collisions. |
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