id stringlengths 9 14 | submitter stringlengths 1 56 ⌀ | authors stringlengths 5 7.68k | title stringlengths 3 299 | comments stringlengths 1 1.15k ⌀ | journal-ref stringlengths 9 298 ⌀ | doi stringlengths 12 97 ⌀ | report-no stringlengths 3 341 ⌀ | categories stringclasses 869 values | license stringclasses 9 values | orig_abstract stringlengths 16 2.44k | versions listlengths 1 39 | update_date stringlengths 10 10 | authors_parsed listlengths 1 565 | abstract stringlengths 13 2.44k |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/9406326 | null | R. Kaminski and L. Lesniak | Low Energy Parameters of the KK and Pipi Scalar-Isoscalar Interactions | 9 pages in LATEX, report no INP-1675/PH | null | 10.1103/PhysRevC.51.2264 | null | hep-ph | null | Threshold expansions of the $\pi\pi$ and $K\overline{K}$ spin 0 and isospin 0
scattering amplitudes are performed. Scattering lengths, effective ranges and
so--called volume parameters are evaluated. Good agreement with the existing
experimental data for the $\pi\pi$ scalar--isoscalar amplitude is found. An
importance of future accurate measurements of the $K\overline{K}$ threshold
parameters is stressed. New data are needed to understand the basic features of
the scalar mesons.
| [
{
"created": "Wed, 15 Jun 1994 15:56:00 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Kaminski",
"R.",
""
],
[
"Lesniak",
"L.",
""
]
] | Threshold expansions of the $\pi\pi$ and $K\overline{K}$ spin 0 and isospin 0 scattering amplitudes are performed. Scattering lengths, effective ranges and so--called volume parameters are evaluated. Good agreement with the existing experimental data for the $\pi\pi$ scalar--isoscalar amplitude is found. An importance of future accurate measurements of the $K\overline{K}$ threshold parameters is stressed. New data are needed to understand the basic features of the scalar mesons. |
hep-ph/0503138 | Chitta Ranjan Das | C.R. Das and L.V. Laperashvili | Phase transition in gauge theories, monopoles and the Multiple Point
Principle | 100 pages, 25 figures, typos corrected | Int.J.Mod.Phys.A20:5911-5988,2005 | 10.1142/S0217751X05025279 | IMSc/2005/03/03 | hep-ph hep-lat hep-th | null | This review is devoted to the Multiple Point Principle (MPP), according to
which several vacuum states with the same energy density exist in Nature. The
MPP is implemented to the Standard Model (SM), Family replicated gauge group
model (FRGGM) and phase transitions in gauge theories with/without monopoles.
Lattice gauge theories are reviewed. The lattice results for critical coupling
constants are compared with those of the Higgs Monopole Model (HMM), in which
the lattice artifact monopoles are replaced by the point-like Higgs scalar
particles with a magnetic charge. Considering our (3+1)-dimensional space-time
as discrete, for example, as a lattice with a parameter a=\lambda_P, equal to
the Planck length, we have investigated the additional contributions of
monopoles to beta-functions of renormalization group equations in the FRGGM
extended beyond the SM at high (the Planck scale) energies. We have reviewed
that, in contrast to the Anti-grand unified theory (AGUT), there exists a
possibility of unification of all gauge interactions (including gravity) near
the Planck scale due to monopoles. The unifications [SU(5)]^3 and [SO(10)]^3 at
the GUT-scale \sim 10^{18} GeV are briefly discussed.
| [
{
"created": "Tue, 15 Mar 2005 00:20:39 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Apr 2005 02:16:13 GMT",
"version": "v2"
},
{
"created": "Mon, 26 Sep 2005 06:25:01 GMT",
"version": "v3"
}
] | 2010-05-27 | [
[
"Das",
"C. R.",
""
],
[
"Laperashvili",
"L. V.",
""
]
] | This review is devoted to the Multiple Point Principle (MPP), according to which several vacuum states with the same energy density exist in Nature. The MPP is implemented to the Standard Model (SM), Family replicated gauge group model (FRGGM) and phase transitions in gauge theories with/without monopoles. Lattice gauge theories are reviewed. The lattice results for critical coupling constants are compared with those of the Higgs Monopole Model (HMM), in which the lattice artifact monopoles are replaced by the point-like Higgs scalar particles with a magnetic charge. Considering our (3+1)-dimensional space-time as discrete, for example, as a lattice with a parameter a=\lambda_P, equal to the Planck length, we have investigated the additional contributions of monopoles to beta-functions of renormalization group equations in the FRGGM extended beyond the SM at high (the Planck scale) energies. We have reviewed that, in contrast to the Anti-grand unified theory (AGUT), there exists a possibility of unification of all gauge interactions (including gravity) near the Planck scale due to monopoles. The unifications [SU(5)]^3 and [SO(10)]^3 at the GUT-scale \sim 10^{18} GeV are briefly discussed. |
hep-ph/9808448 | Wim deBoer | W. de Boer | Search for SUSY and Higgs particles | latex + 10 eps figs, 16 pages, IEKP-KA/98-16; Invited talk at the
XVIII Physics in Collision Conference, Frascati, 16-20 June 1998. In update
latest results included | null | null | null | hep-ph | null | An overview of hints for new physics outside the Standard Model and the
status of sparticle and Higgs searches is given. The present limits on Higgs
bosons of about 90 GeV as well as the $\bsg$ rate and cosmological constraints
severely restrict the available parameter space of the MSSM.
| [
{
"created": "Fri, 28 Aug 1998 08:10:46 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Sep 1998 10:15:09 GMT",
"version": "v2"
}
] | 2009-09-25 | [
[
"de Boer",
"W.",
""
]
] | An overview of hints for new physics outside the Standard Model and the status of sparticle and Higgs searches is given. The present limits on Higgs bosons of about 90 GeV as well as the $\bsg$ rate and cosmological constraints severely restrict the available parameter space of the MSSM. |
hep-ph/9712266 | Asmaa Abada | As. Abada, O. P\`ene and J. Rodriguez-Quintero | Multibody neutrino exchange in a neutron star: neutrino sea and border
effects | Latex file (Revtex), 11 pages, 2 figures | Phys.Lett. B423 (1998) 355-363 | 10.1016/S0370-2693(98)00037-9 | null | hep-ph | null | The interaction due to the exchange of massless neutrinos between neutrons is
a long-range force. Border effects on this multibody exchange inside a dense
core are studied and computed analytically in 1 + 1 dimensions. We demonstrate
in this work that a proper treatment of the star's border effect automatically
incorporates the condensate contribution as a consequence of the appropriate
boundary conditions for the neutrino Feynman propagator inside the star.
The total multibody exchange contribution is infrared-safe and vanishes
exactly in 1 + 1 dimensions. The general conclusion of this work is that the
border effect does not modify the result that neutrino exchange is
infrared-safe. This toy model prepares the ground and gives the tools for the
study of the realistic 3 + 1 star.
| [
{
"created": "Thu, 4 Dec 1997 16:21:24 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Abada",
"As.",
""
],
[
"Pène",
"O.",
""
],
[
"Rodriguez-Quintero",
"J.",
""
]
] | The interaction due to the exchange of massless neutrinos between neutrons is a long-range force. Border effects on this multibody exchange inside a dense core are studied and computed analytically in 1 + 1 dimensions. We demonstrate in this work that a proper treatment of the star's border effect automatically incorporates the condensate contribution as a consequence of the appropriate boundary conditions for the neutrino Feynman propagator inside the star. The total multibody exchange contribution is infrared-safe and vanishes exactly in 1 + 1 dimensions. The general conclusion of this work is that the border effect does not modify the result that neutrino exchange is infrared-safe. This toy model prepares the ground and gives the tools for the study of the realistic 3 + 1 star. |
hep-ph/0012135 | Yusuf Dincer | Yusuf Dincer (RWTH Aachen) | Fourth generation effects in the $B_s \to \nu \bar{\nu} \gamma$ decay | 10 pages, Latex | Phys.Lett. B505 (2001) 89-93 | 10.1016/S0370-2693(01)00386-0 | null | hep-ph | null | If the fourth generation fermions exist, the new quarks could influence the
branching ratio of the decay $B_s \to \nu \bar{\nu} \gamma$. We obtain two
solutions of the fourth generation CKM factor $V^*_{t's} V_{t'b}$ from the
decay of $B \to X_s \gamma$. With these two solutions we calculate the new
contributions of the fourth generation quark to Wilson coefficients of the
decay $B_s \to \nu \bar{\nu} \gamma$. The branching ratio of the decay $B_s \to
\nu \bar{\nu} \gamma$ in the two cases are calculated. In one case, our results
are quite different from that of SM, but almost same in another case. If a
fourth generation should exist in nature and nature chooses the former case,
this B meson decay could provide a possible test of the fourth generation
existence.
| [
{
"created": "Tue, 12 Dec 2000 17:57:06 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Dincer",
"Yusuf",
"",
"RWTH Aachen"
]
] | If the fourth generation fermions exist, the new quarks could influence the branching ratio of the decay $B_s \to \nu \bar{\nu} \gamma$. We obtain two solutions of the fourth generation CKM factor $V^*_{t's} V_{t'b}$ from the decay of $B \to X_s \gamma$. With these two solutions we calculate the new contributions of the fourth generation quark to Wilson coefficients of the decay $B_s \to \nu \bar{\nu} \gamma$. The branching ratio of the decay $B_s \to \nu \bar{\nu} \gamma$ in the two cases are calculated. In one case, our results are quite different from that of SM, but almost same in another case. If a fourth generation should exist in nature and nature chooses the former case, this B meson decay could provide a possible test of the fourth generation existence. |
1911.11994 | Vladimir V. Anisovich | A.N. Semenova, V.V. Anisovich, A.V. Sarantsev | New narrow LHCb pentaquarks as lowest antiquark-diquark-diquark systems | null | null | 10.1140/epja/s10050-020-00151-7 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The antiquark-diquark-diquark model describes pentaquark states both in terms
of quarks and hadrons. We discuss pentaquark states with hidden charm $P(\bar c
cuud)$ discovered in the $J/\Psi p$ spectrum by the LHCb collaboration. We
consider three pentaquark states as members of the lowest ($S$-wave) multiplet
and discuss the mass splitting scheme. The latest LHCb data for pentaquarks
with hidden charm provide an opportunity to make an assumption about the
diquark content of the pentaquark states. We give a classification for the LHCb
pentaquarks and define recombination channels for these states.
| [
{
"created": "Wed, 27 Nov 2019 07:26:07 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Apr 2020 12:27:40 GMT",
"version": "v2"
}
] | 2020-06-24 | [
[
"Semenova",
"A. N.",
""
],
[
"Anisovich",
"V. V.",
""
],
[
"Sarantsev",
"A. V.",
""
]
] | The antiquark-diquark-diquark model describes pentaquark states both in terms of quarks and hadrons. We discuss pentaquark states with hidden charm $P(\bar c cuud)$ discovered in the $J/\Psi p$ spectrum by the LHCb collaboration. We consider three pentaquark states as members of the lowest ($S$-wave) multiplet and discuss the mass splitting scheme. The latest LHCb data for pentaquarks with hidden charm provide an opportunity to make an assumption about the diquark content of the pentaquark states. We give a classification for the LHCb pentaquarks and define recombination channels for these states. |
0811.2288 | Juan Rojo | NNPDF Collaboration: Juan Rojo, Richard D. Ball, Luigi Del Debbio,
Stefano Forte, Alberto Guffanti, Jose I. Latorre, Andrea Piccione, Maria
Ubiali | Update on Neural Network Parton Distributions: NNPDF1.1 | 5 pages, 6 figures, proceedings of the International Symposium on
Multiparticle Dynamics 08, 15-20 september 2008, DESY | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present recent progress within the NNPDF parton analysis framework. After
a brief review of the results from the DIS NNPDF analysis, NNPDF1.0, we discuss
results from an updated analysis with independent parametrizations for the
strange and anti-strange distributions, denoted by NNPDF1.1. We examine the
phenomenological implications of this improved analysis for the strange PDFs.
| [
{
"created": "Fri, 14 Nov 2008 08:48:44 GMT",
"version": "v1"
}
] | 2008-11-17 | [
[
"NNPDF Collaboration",
"",
""
],
[
"Rojo",
"Juan",
""
],
[
"Ball",
"Richard D.",
""
],
[
"Del Debbio",
"Luigi",
""
],
[
"Forte",
"Stefano",
""
],
[
"Guffanti",
"Alberto",
""
],
[
"Latorre",
"Jose I.",
""
],
[
"Piccione",
"Andrea",
""
],
[
"Ubiali",
"Maria",
""
]
] | We present recent progress within the NNPDF parton analysis framework. After a brief review of the results from the DIS NNPDF analysis, NNPDF1.0, we discuss results from an updated analysis with independent parametrizations for the strange and anti-strange distributions, denoted by NNPDF1.1. We examine the phenomenological implications of this improved analysis for the strange PDFs. |
1609.00113 | Tong Li | Csaba Bal\'azs, Tong Li | Dark matter properties implied by gamma ray interstellar emission models | 26 pages, 9 figures and 3 tables | null | 10.1088/1475-7516/2017/02/037 | CoEPP-MN-16-21 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We infer dark matter properties from gamma ray residuals extracted using
eight different interstellar emission scenarios proposed by the Fermi-LAT
Collaboration to explain the Galactic Center gamma ray excess. Adopting the
most plausible simplified ansatz, we assume that the dark matter particle is a
Majorana fermion interacting with standard fermions via a scalar mediator.
Using this theoretical hypothesis and the Fermi residuals we calculate Bayesian
evidences, including Fermi-LAT exclusion limits from 15 dwarf spheroidal
galaxies as well. Our Bayes factors single out four of the Fermi scenarios as
compatible with the simplified dark matter model. In the most preferred
scenario the dark matter (mediator) mass is in the 100-500 (1-200) GeV range
and its annihilation is dominated by top quark final state. Less preferred but
still plausible is annihilation into b\bar{b} and tau^+tau^- final states with
an order of magnitude lower dark matter mass. Our conclusion is that the
properties of dark matter extracted from gamma ray data are highly sensitive to
the modeling of the interstellar emission.
| [
{
"created": "Thu, 1 Sep 2016 05:22:40 GMT",
"version": "v1"
}
] | 2017-03-08 | [
[
"Balázs",
"Csaba",
""
],
[
"Li",
"Tong",
""
]
] | We infer dark matter properties from gamma ray residuals extracted using eight different interstellar emission scenarios proposed by the Fermi-LAT Collaboration to explain the Galactic Center gamma ray excess. Adopting the most plausible simplified ansatz, we assume that the dark matter particle is a Majorana fermion interacting with standard fermions via a scalar mediator. Using this theoretical hypothesis and the Fermi residuals we calculate Bayesian evidences, including Fermi-LAT exclusion limits from 15 dwarf spheroidal galaxies as well. Our Bayes factors single out four of the Fermi scenarios as compatible with the simplified dark matter model. In the most preferred scenario the dark matter (mediator) mass is in the 100-500 (1-200) GeV range and its annihilation is dominated by top quark final state. Less preferred but still plausible is annihilation into b\bar{b} and tau^+tau^- final states with an order of magnitude lower dark matter mass. Our conclusion is that the properties of dark matter extracted from gamma ray data are highly sensitive to the modeling of the interstellar emission. |
2206.05203 | Sarben Sarkar | Sarben Sarkar | Anomalies, CPT and Leptogenesis | null | null | null | KCL-PH-TH/2022-24 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We bring together different puzzles in physics beyond the Standard Model of
particle physics. Within our model baryogenesis, neutrino mass, strong CP and
dark matter puzzles are related. The common ingredient in connecting these
puzzles is the Kalb-Ramond field, a two form present in the gravitational
multiplet in the theory of closed strings. Leptons are fermions which we need
to couple to gravitational degrees of freedom using a vierbein formalism. The
presence of torsion provided by a Kalb-Ramond background leads us to firstly an
effective model involving the Einstein-Cartan formulation of gravity, a gauge
theory, in which coupling to fermions is via a covariant derivative and
secondly to a mechanism for CPT violation. This picture emerges from a low
energy string effective action obtained from a closed bosonic string theory
after compactification to four dimensions. The Kalb-Ramond field in four
dimensions can be identified with a pseudoscalar gravitational axion. Because
of the presence of an axial anomaly this axion can couple with the gluon field,
and in this way allows a connection with the strong CP problem and axionic dark
matter.
| [
{
"created": "Fri, 10 Jun 2022 16:01:31 GMT",
"version": "v1"
}
] | 2022-06-13 | [
[
"Sarkar",
"Sarben",
""
]
] | We bring together different puzzles in physics beyond the Standard Model of particle physics. Within our model baryogenesis, neutrino mass, strong CP and dark matter puzzles are related. The common ingredient in connecting these puzzles is the Kalb-Ramond field, a two form present in the gravitational multiplet in the theory of closed strings. Leptons are fermions which we need to couple to gravitational degrees of freedom using a vierbein formalism. The presence of torsion provided by a Kalb-Ramond background leads us to firstly an effective model involving the Einstein-Cartan formulation of gravity, a gauge theory, in which coupling to fermions is via a covariant derivative and secondly to a mechanism for CPT violation. This picture emerges from a low energy string effective action obtained from a closed bosonic string theory after compactification to four dimensions. The Kalb-Ramond field in four dimensions can be identified with a pseudoscalar gravitational axion. Because of the presence of an axial anomaly this axion can couple with the gluon field, and in this way allows a connection with the strong CP problem and axionic dark matter. |
hep-ph/0702192 | Roberto Casalbuoni Prof | Roberto Casalbuoni | On the Ground State of QCD inside a Compact Stellar Object | Invited talk at the 2006 International Workshop SCGT 06 "Origin of
Mass and Strong Coupling Gauge Theories" 21-24 November 2006, Nagoya, Japan.
Latex file 15 pages. 6 figures | null | 10.1142/9789812790750_0012 | null | hep-ph | null | We describe the effects of the strange quark mass and of the color and
electric neutrality on the superconducing phases of QCD.
| [
{
"created": "Mon, 19 Feb 2007 16:11:55 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Casalbuoni",
"Roberto",
""
]
] | We describe the effects of the strange quark mass and of the color and electric neutrality on the superconducing phases of QCD. |
1007.1355 | Tim Ledwig | Tim Ledwig, Antonio Silva, Hyun-Chul Kim | Anomalous tensor magnetic moments and form factors of the proton in the
self-consistent chiral quark-soliton model | 14 pages, 3 figures | Phys.Rev.D82:054014,2010 | 10.1103/PhysRevD.82.054014 | null | hep-ph hep-ex hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the form factors of the chiral-odd nucleon matrix element of
the tensor current. In particular, we aim at the anomalous tensor magnetic form
factors of the nucleon within the framework of the SU(3) and SU(2) chiral
quark-soliton model. We consider $1/N_c$ rotational corrections and linear
effects of SU(3) symmetry breaking with the symmetry-conserving quantization
employed. We first obtain the results of the anomalous tensor magnetic moments
for the up and down quarks: $\kappa_{T}^{u}=3.56$ and $\kappa_{T}^{d}=1.83$,
respectively. The strange anomalous tensor magnetic moment is yielded to be
$\kappa_{T}^{s}=0.2\sim -0.2$, that is compatible with zero. We also calculate
the corresponding form factors $\kappa_{T}^{q}(Q^{2})$ up to a momentum
transfer $Q^{2}\leq 1\,\mathrm{GeV}^{2}$ at a renormalization scale of
$0.36\,\mathrm{GeV}^{2}$.
| [
{
"created": "Thu, 8 Jul 2010 12:26:05 GMT",
"version": "v1"
}
] | 2014-11-21 | [
[
"Ledwig",
"Tim",
""
],
[
"Silva",
"Antonio",
""
],
[
"Kim",
"Hyun-Chul",
""
]
] | We investigate the form factors of the chiral-odd nucleon matrix element of the tensor current. In particular, we aim at the anomalous tensor magnetic form factors of the nucleon within the framework of the SU(3) and SU(2) chiral quark-soliton model. We consider $1/N_c$ rotational corrections and linear effects of SU(3) symmetry breaking with the symmetry-conserving quantization employed. We first obtain the results of the anomalous tensor magnetic moments for the up and down quarks: $\kappa_{T}^{u}=3.56$ and $\kappa_{T}^{d}=1.83$, respectively. The strange anomalous tensor magnetic moment is yielded to be $\kappa_{T}^{s}=0.2\sim -0.2$, that is compatible with zero. We also calculate the corresponding form factors $\kappa_{T}^{q}(Q^{2})$ up to a momentum transfer $Q^{2}\leq 1\,\mathrm{GeV}^{2}$ at a renormalization scale of $0.36\,\mathrm{GeV}^{2}$. |
hep-ph/9910526 | Kimball A. Milton | Leonard Gamberg and Kimball A. Milton | Dual Quantum Electrodynamics: Dyon-Dyon and Charge-Monopole Scattering
in a High-Energy Approximation | 24 pages, 1 ps figure, REVTeX | Phys.Rev. D61 (2000) 075013 | 10.1103/PhysRevD.61.075013 | OKHEP-99-02 | hep-ph hep-th | null | We develop the quantum field theory of electron-point magnetic monopole
interactions and more generally, dyon-dyon interactions, based on the original
string-dependent ``nonlocal'' action of Dirac and Schwinger. We demonstrate
that a viable nonperturbative quantum field theoretic formulation can be
constructed that results in a string {\em independent} cross section for
monopole-electron and dyon-dyon scattering. Such calculations can be done only
by using nonperturbative approximations such as the eikonal and not by some
mutilation of lowest-order perturbation theory.
| [
{
"created": "Wed, 27 Oct 1999 22:42:38 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Gamberg",
"Leonard",
""
],
[
"Milton",
"Kimball A.",
""
]
] | We develop the quantum field theory of electron-point magnetic monopole interactions and more generally, dyon-dyon interactions, based on the original string-dependent ``nonlocal'' action of Dirac and Schwinger. We demonstrate that a viable nonperturbative quantum field theoretic formulation can be constructed that results in a string {\em independent} cross section for monopole-electron and dyon-dyon scattering. Such calculations can be done only by using nonperturbative approximations such as the eikonal and not by some mutilation of lowest-order perturbation theory. |
2101.06862 | Zhi-Long Han | Fa-Xin Yang, Zhi-Long Han, Yi Jin | Same-Sign Dilepton Signature in the Inert Doublet Model | null | null | 10.1088/1674-1137/abf828 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In this paper, we perform a detailed analysis on the same-sign dilepton
signature in the inert doublet model. Focusing on the low dark matter mass
region, we randomly scan the corresponding parameter space. Viable samples
allowed by various constraints are obtained, among which twenty benchmark
points are selected for further collider signature study. At hadron colliders,
the same-sign dilepton signature is produced via $pp\to W^{\pm *}W^{\pm *}jj
\to H^\pm H^\pm jj$ with the leptonic decay mode $ H^\pm \to HW^\pm (\to l^\pm
\nu)$, where $H$ is the dark matter candidate. We investigate the testability
of this signal at the high-luminosity LHC (HL-LHC) and the proposed 27 TeV
high-energy LHC (HE-LHC). According to our simulation, the HL-LHC with
$\mathcal{L}=3~ab^{-1}$ can hardly probe this signal. Meanwhile, for the HE-LHC
with $\mathcal{L}=15~ab^{-1}$, it is promising to obtain a $5\sigma$
significance when $250~\text{GeV}\lesssim m_{H^\pm}-m_H\lesssim 300$ GeV with
dark matter mass $m_H\sim 60$ or 71 GeV.
| [
{
"created": "Mon, 18 Jan 2021 03:37:09 GMT",
"version": "v1"
}
] | 2021-09-01 | [
[
"Yang",
"Fa-Xin",
""
],
[
"Han",
"Zhi-Long",
""
],
[
"Jin",
"Yi",
""
]
] | In this paper, we perform a detailed analysis on the same-sign dilepton signature in the inert doublet model. Focusing on the low dark matter mass region, we randomly scan the corresponding parameter space. Viable samples allowed by various constraints are obtained, among which twenty benchmark points are selected for further collider signature study. At hadron colliders, the same-sign dilepton signature is produced via $pp\to W^{\pm *}W^{\pm *}jj \to H^\pm H^\pm jj$ with the leptonic decay mode $ H^\pm \to HW^\pm (\to l^\pm \nu)$, where $H$ is the dark matter candidate. We investigate the testability of this signal at the high-luminosity LHC (HL-LHC) and the proposed 27 TeV high-energy LHC (HE-LHC). According to our simulation, the HL-LHC with $\mathcal{L}=3~ab^{-1}$ can hardly probe this signal. Meanwhile, for the HE-LHC with $\mathcal{L}=15~ab^{-1}$, it is promising to obtain a $5\sigma$ significance when $250~\text{GeV}\lesssim m_{H^\pm}-m_H\lesssim 300$ GeV with dark matter mass $m_H\sim 60$ or 71 GeV. |
1802.00713 | Petja Paakkinen | Kari J. Eskola, Petja Paakkinen, Hannu Paukkunen, Carlos A. Salgado | EPPS16 - Bringing nuclear PDFs to the LHC era | 6 pages, 5 figures. Prepared for the proceedings of the 12th
International Workshop on High-pT Physics in the RHIC/LHC Era | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report on EPPS16, the first global analysis of nuclear parton distribution
functions (nPDFs) to include LHC data. Also for the first time, a full flavour
dependence of nPDFs is allowed. While the included Z and W data are found to
have insufficient statistics to yield stringent constraints, the CMS 5.02 TeV
proton-lead dijet data prove crucial in setting the shape of nuclear gluon
modifications. With these and other observables being measured in proton-lead
runs, we are experiencing a shift of nPDFs to the LHC precision era.
| [
{
"created": "Fri, 2 Feb 2018 15:07:09 GMT",
"version": "v1"
}
] | 2018-02-05 | [
[
"Eskola",
"Kari J.",
""
],
[
"Paakkinen",
"Petja",
""
],
[
"Paukkunen",
"Hannu",
""
],
[
"Salgado",
"Carlos A.",
""
]
] | We report on EPPS16, the first global analysis of nuclear parton distribution functions (nPDFs) to include LHC data. Also for the first time, a full flavour dependence of nPDFs is allowed. While the included Z and W data are found to have insufficient statistics to yield stringent constraints, the CMS 5.02 TeV proton-lead dijet data prove crucial in setting the shape of nuclear gluon modifications. With these and other observables being measured in proton-lead runs, we are experiencing a shift of nPDFs to the LHC precision era. |
2311.05429 | Nicola Losacco | Nicola Losacco | New theory highlights on $B_c$ decays | 6 pages, 6 figures, 1 table, Talk given at IFAE 2023 (Incontri di
Fisica delle Alte Energie 2023), Catania, Italy, 12-14 Apr 2023 | null | null | BARI-TH/752-23 | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | We present recent results in semileptonic and non-leptonic exclusive $B_c$
decays to charmonium states both in $S$-wave, $J/\psi$ and $\eta_c$, and in
$P$-wave, $\chi_{cJ}$ and $h_c$. The analysis, based on the heavy quark spin
symmetry (HQSS), produces relations among form factors that parametrize the
hadronic matrix elements in the amplitudes of the decays. These relations are
helpful to control the hadronic uncertainty affecting these processes.
Furthermore, $B_c$ decays allow us to get hints on the structure of states like
$\chi_{c1}(3872)$, whose exotic or ordinary charmonium nature is debated.
| [
{
"created": "Thu, 9 Nov 2023 15:10:06 GMT",
"version": "v1"
}
] | 2023-11-10 | [
[
"Losacco",
"Nicola",
""
]
] | We present recent results in semileptonic and non-leptonic exclusive $B_c$ decays to charmonium states both in $S$-wave, $J/\psi$ and $\eta_c$, and in $P$-wave, $\chi_{cJ}$ and $h_c$. The analysis, based on the heavy quark spin symmetry (HQSS), produces relations among form factors that parametrize the hadronic matrix elements in the amplitudes of the decays. These relations are helpful to control the hadronic uncertainty affecting these processes. Furthermore, $B_c$ decays allow us to get hints on the structure of states like $\chi_{c1}(3872)$, whose exotic or ordinary charmonium nature is debated. |
1604.07777 | Pedro Miguel Martins Ferreira | P.M. Ferreira, W. Grimus, D. Jurciukonis, L. Lavoura | Scotogenic model for co-bimaximal mixing | v2 - 23 pages, 5 figures, minor changes requested by referee | null | 10.1007/JHEP07(2016)010 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a scotogenic model, i.e. a one-loop neutrino mass model with dark
right-handed neutrino gauge singlets and one inert dark scalar gauge doublet
$\eta$, which has symmetries that lead to co-bimaximal mixing, i.e. to an
atmospheric mixing angle $\theta_{23} = 45^\circ$ and to a $CP$-violating phase
$\delta = \pm \pi/2$, while the mixing angle $\theta_{13}$ remains arbitrary.
The symmetries consist of softly broken lepton numbers $L_\alpha$ ($\alpha =
e,\mu,\tau$), a non-standard $CP$ symmetry, and three $Z_2$ symmetries. We
indicate two possibilities for extending the model to the quark sector. Since
the model has, besides $\eta$, three scalar gauge doublets, we perform a
thorough discussion of its scalar sector. We demonstrate that it can
accommodate a Standard Model-like scalar with mass $125\, \mathrm{GeV}$, with
all the other charged and neutral scalars having much higher masses.
| [
{
"created": "Tue, 26 Apr 2016 18:07:31 GMT",
"version": "v1"
},
{
"created": "Mon, 2 May 2016 18:59:20 GMT",
"version": "v2"
},
{
"created": "Thu, 16 Jun 2016 11:10:58 GMT",
"version": "v3"
}
] | 2016-07-20 | [
[
"Ferreira",
"P. M.",
""
],
[
"Grimus",
"W.",
""
],
[
"Jurciukonis",
"D.",
""
],
[
"Lavoura",
"L.",
""
]
] | We present a scotogenic model, i.e. a one-loop neutrino mass model with dark right-handed neutrino gauge singlets and one inert dark scalar gauge doublet $\eta$, which has symmetries that lead to co-bimaximal mixing, i.e. to an atmospheric mixing angle $\theta_{23} = 45^\circ$ and to a $CP$-violating phase $\delta = \pm \pi/2$, while the mixing angle $\theta_{13}$ remains arbitrary. The symmetries consist of softly broken lepton numbers $L_\alpha$ ($\alpha = e,\mu,\tau$), a non-standard $CP$ symmetry, and three $Z_2$ symmetries. We indicate two possibilities for extending the model to the quark sector. Since the model has, besides $\eta$, three scalar gauge doublets, we perform a thorough discussion of its scalar sector. We demonstrate that it can accommodate a Standard Model-like scalar with mass $125\, \mathrm{GeV}$, with all the other charged and neutral scalars having much higher masses. |
hep-ph/0606309 | A. Guffanti | J. Bl\"umlein, H. B\"ottcher and A. Guffanti | NNLO analysis of unpolarized DIS structure functions | 4 pages, 1 figure, to appear in the proceedings of DIS 2006, Tsukuba,
Japan, April 2006 | null | 10.1142/9789812706706_0028 | null | hep-ph | null | We present the results of a NNLO QCD analysis of the World data on
unpolarized DIS Non-Singlet Structure functions.
| [
{
"created": "Thu, 29 Jun 2006 18:02:08 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Blümlein",
"J.",
""
],
[
"Böttcher",
"H.",
""
],
[
"Guffanti",
"A.",
""
]
] | We present the results of a NNLO QCD analysis of the World data on unpolarized DIS Non-Singlet Structure functions. |
1212.5065 | Marco Fabbrichesi | F. Bazzocchi and M. Fabbrichesi | The little hierarchy problem for new physics just beyond the LHC | arXiv admin note: text overlap with arXiv:1207.0951 | null | 10.1103/PhysRevD.87.036001 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss two possible extensions to the standard model in which an inert
singlet scalar state that only interacts with the Higgs boson is added together
with some fermions. In one model the fermions provide for a see-saw mechanism
for the neutrino masses, in the other model for grand unification of the gauge
couplings. Masses and interaction strengths are fixed by the requirement of
controlling the finite one-loop corrections to the Higgs boson mass thus
addressing the little hierarchy problem. The inert scalar could provide a
viable dark matter candidate. Direct detection of this scalar singlet in
nuclear scattering experiments is possible with a cross section within reach of
future experiments.
| [
{
"created": "Thu, 20 Dec 2012 14:48:29 GMT",
"version": "v1"
}
] | 2013-05-30 | [
[
"Bazzocchi",
"F.",
""
],
[
"Fabbrichesi",
"M.",
""
]
] | We discuss two possible extensions to the standard model in which an inert singlet scalar state that only interacts with the Higgs boson is added together with some fermions. In one model the fermions provide for a see-saw mechanism for the neutrino masses, in the other model for grand unification of the gauge couplings. Masses and interaction strengths are fixed by the requirement of controlling the finite one-loop corrections to the Higgs boson mass thus addressing the little hierarchy problem. The inert scalar could provide a viable dark matter candidate. Direct detection of this scalar singlet in nuclear scattering experiments is possible with a cross section within reach of future experiments. |
2404.15990 | Jin-Lei Yang | Jin-Lei Yang, Hai-Bin Zhang, Tai-Fu Feng | A mechanism relating the fermionic mass hierarchy to the flavor mixing | 12 pages, 4 figures | Phys. Lett. B 853 (2024) 138677 | 10.1016/j.physletb.2024.138677 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Considering the hierarchical structure of fermionic masses and the fermionic
flavor mixing puzzles in the Standard Model, we propose to relate them by the
see-saw mechanism, i.e. only the third generation of quarks and charged leptons
achieve the masses at the tree level, the first two generations achieves masses
through the mixings with the third generation, and the neutrinos achieve tiny
Majorana masses by the so-called Type-I see-saw mechanism. This new picture at
the fermion sector can explain simultaneously the flavor mixing puzzle and mass
hierarchy puzzle in the SM. In addition, a flavor-dependent model (FDM) is
proposed to realize the new mechanism, and observing the top quark rare decay
processes $t\to ch$, $t\to uh$ and the lepton flavor violation processes
$\mu\to3e,\;\tau\to3e,\;\mu\to3\mu$ is effective to test the proposed FDM.
| [
{
"created": "Wed, 24 Apr 2024 17:05:05 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Apr 2024 08:29:18 GMT",
"version": "v2"
}
] | 2024-05-06 | [
[
"Yang",
"Jin-Lei",
""
],
[
"Zhang",
"Hai-Bin",
""
],
[
"Feng",
"Tai-Fu",
""
]
] | Considering the hierarchical structure of fermionic masses and the fermionic flavor mixing puzzles in the Standard Model, we propose to relate them by the see-saw mechanism, i.e. only the third generation of quarks and charged leptons achieve the masses at the tree level, the first two generations achieves masses through the mixings with the third generation, and the neutrinos achieve tiny Majorana masses by the so-called Type-I see-saw mechanism. This new picture at the fermion sector can explain simultaneously the flavor mixing puzzle and mass hierarchy puzzle in the SM. In addition, a flavor-dependent model (FDM) is proposed to realize the new mechanism, and observing the top quark rare decay processes $t\to ch$, $t\to uh$ and the lepton flavor violation processes $\mu\to3e,\;\tau\to3e,\;\mu\to3\mu$ is effective to test the proposed FDM. |
1512.02705 | Marshall Baker | M. Baker | A New Constraint on Effective Field Theories of the QCD Flux Tube | 29 pages, 3 figures, fixed typos and references | Phys. Rev. D 93, 054012 (2016) | 10.1103/PhysRevD.93.054012 | null | hep-ph hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Effective magnetic $SU(N)$ gauge theory with classical $Z_N$ flux tubes of
intrinsic width $\frac{1}{M}$ is an effective field theory of the long distance
quark-antiquark interaction in $SU(N)$ Yang-Mills theory. Long wavelength
fluctuations of the $Z_N$ vortices of this theory lead to an effective string
theory. In this paper we clarify the connection between effective field theory
and effective string theory and we propose a new constraint on these vortices.
We first examine the impact of string fluctuations on the classical dual
superconductor description of confinement. At inter-quark distances $R\sim
\frac{1}{M}$ the classical action for a straight flux tube determines the heavy
quark potentials. At distances $R \gg \frac{1}{M}$ fluctuations of the flux
tube axis $\tilde{x}$ give rise to an effective string theory with an action
$S_{eff} (\tilde{x})$, the classical action for a curved flux tube, evaluated
in the limit $\frac{1}{M} \rightarrow 0~$. This action is equal to the
Nambu-Goto action. These conclusions are independent of the details of the
$Z_N$ flux tube. Further, we assume the QCD flux tube satisfies the additional
constraint: $$\int_0^\infty r dr \frac{T_{\theta \theta} (r)}{r^2} =0,$$ where
$\frac{T_{\theta \theta}(r)}{r^2}$ is the value of the $\theta\theta$ component
of the stress tensor at a distance $r$ from the axis of an infinite flux tube.
Under this constraint the string tension $\sigma$ equals the force on a quark
in the chromoelectric field $\vec{E}$ of an infinite straight flux tube, and
the Nambu-Goto action can be represented in terms of the chromodynamic fields
of effective magnetic $SU(N)$ gauge theory, yielding a field theory
interpretation of effective string theory.
| [
{
"created": "Wed, 9 Dec 2015 00:41:07 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Dec 2015 22:05:57 GMT",
"version": "v2"
},
{
"created": "Wed, 3 Feb 2016 20:29:29 GMT",
"version": "v3"
},
{
"created": "Wed, 17 Feb 2016 20:17:03 GMT",
"version": "v4"
}
] | 2016-03-23 | [
[
"Baker",
"M.",
""
]
] | Effective magnetic $SU(N)$ gauge theory with classical $Z_N$ flux tubes of intrinsic width $\frac{1}{M}$ is an effective field theory of the long distance quark-antiquark interaction in $SU(N)$ Yang-Mills theory. Long wavelength fluctuations of the $Z_N$ vortices of this theory lead to an effective string theory. In this paper we clarify the connection between effective field theory and effective string theory and we propose a new constraint on these vortices. We first examine the impact of string fluctuations on the classical dual superconductor description of confinement. At inter-quark distances $R\sim \frac{1}{M}$ the classical action for a straight flux tube determines the heavy quark potentials. At distances $R \gg \frac{1}{M}$ fluctuations of the flux tube axis $\tilde{x}$ give rise to an effective string theory with an action $S_{eff} (\tilde{x})$, the classical action for a curved flux tube, evaluated in the limit $\frac{1}{M} \rightarrow 0~$. This action is equal to the Nambu-Goto action. These conclusions are independent of the details of the $Z_N$ flux tube. Further, we assume the QCD flux tube satisfies the additional constraint: $$\int_0^\infty r dr \frac{T_{\theta \theta} (r)}{r^2} =0,$$ where $\frac{T_{\theta \theta}(r)}{r^2}$ is the value of the $\theta\theta$ component of the stress tensor at a distance $r$ from the axis of an infinite flux tube. Under this constraint the string tension $\sigma$ equals the force on a quark in the chromoelectric field $\vec{E}$ of an infinite straight flux tube, and the Nambu-Goto action can be represented in terms of the chromodynamic fields of effective magnetic $SU(N)$ gauge theory, yielding a field theory interpretation of effective string theory. |
1507.02412 | Kenji Nishiwaki | Kenji Nishiwaki, Hiroshi Okada and Yuta Orikasa | Three Loop Neutrino Model with Isolated $k^{\pm\pm}$ | 48 pages, 9 figures, 6 tables (v3): published version from PRD, title
changed, typos corrected, new discussions added | Phys. Rev. D 92, 093013 (2015) | 10.1103/PhysRevD.92.093013 | KIAS-P15035 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We propose a three loop radiative neutrino mass scenario with an isolated
doubly charged singlet scalar $k^{\pm\pm}$ without couplings to the charged
leptons, while two other singly charged scalars $h_1^\pm$ and $h_2^\pm$ attach
to them. In this setup, the lepton flavor violation originating from
$k^{\pm\pm}$ exchanges is suppressed and the model is less constrained, where
some couplings can take sizable values. As reported in our previous work, the
loop suppression factor at the three loop level would be too strong and
realized neutrino masses in a three loop scenario could be smaller than the
observed minuscule values. The sizable couplings can help us to enhance
neutrino masses without drastically large scalar trilinear couplings appearing
in a neutrino mass matrix, which tends to drive the vacuum stability to become
jeopardized at the one loop level. Now the doubly charged scalar $k^{\pm\pm}$
has less constraint via lepton flavor violation and the vacuum can be quite
stable, and thus a few hundred GeV mass in $k^{\pm\pm}$ is possible, which is
within the LHC reach and this model can be tested in the near future. Note that
the other $h_1^\pm$ and $h_2^\pm$ should be heavy at least around a few TeV. We
suitably arrange the charges of an additional global $U(1)$ symmetry, where the
decay constant of the associated Nambu-Goldstone boson can be around a TeV
scale consistently. Also, this model is indirectly limited through a global
analysis on results of the LHC Higgs search and issues on a dark matter
candidate, the lightest Majorana neutrino. After $h_1^\pm$ and $h_2^\pm$ are
decoupled, this particle couples to the standard model particles only through
two charge parity even scalars in theory and thus information on this scalar
sector is important. Consistent solutions are found, but a part of them is now
on the edge.
| [
{
"created": "Thu, 9 Jul 2015 08:25:25 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Jul 2015 00:02:57 GMT",
"version": "v2"
},
{
"created": "Fri, 27 Nov 2015 08:04:34 GMT",
"version": "v3"
}
] | 2015-12-02 | [
[
"Nishiwaki",
"Kenji",
""
],
[
"Okada",
"Hiroshi",
""
],
[
"Orikasa",
"Yuta",
""
]
] | We propose a three loop radiative neutrino mass scenario with an isolated doubly charged singlet scalar $k^{\pm\pm}$ without couplings to the charged leptons, while two other singly charged scalars $h_1^\pm$ and $h_2^\pm$ attach to them. In this setup, the lepton flavor violation originating from $k^{\pm\pm}$ exchanges is suppressed and the model is less constrained, where some couplings can take sizable values. As reported in our previous work, the loop suppression factor at the three loop level would be too strong and realized neutrino masses in a three loop scenario could be smaller than the observed minuscule values. The sizable couplings can help us to enhance neutrino masses without drastically large scalar trilinear couplings appearing in a neutrino mass matrix, which tends to drive the vacuum stability to become jeopardized at the one loop level. Now the doubly charged scalar $k^{\pm\pm}$ has less constraint via lepton flavor violation and the vacuum can be quite stable, and thus a few hundred GeV mass in $k^{\pm\pm}$ is possible, which is within the LHC reach and this model can be tested in the near future. Note that the other $h_1^\pm$ and $h_2^\pm$ should be heavy at least around a few TeV. We suitably arrange the charges of an additional global $U(1)$ symmetry, where the decay constant of the associated Nambu-Goldstone boson can be around a TeV scale consistently. Also, this model is indirectly limited through a global analysis on results of the LHC Higgs search and issues on a dark matter candidate, the lightest Majorana neutrino. After $h_1^\pm$ and $h_2^\pm$ are decoupled, this particle couples to the standard model particles only through two charge parity even scalars in theory and thus information on this scalar sector is important. Consistent solutions are found, but a part of them is now on the edge. |
hep-ph/0001047 | Vojtech Kundrat | Vojtech Kundrat, Milos Lokajicek, D. Krupa | High-energy elastic hadron collisions and space structure of hadrons | 22 pages, 16 figures | null | null | null | hep-ph | null | The elastic and inelastic profiles have been derived from the measured
elastic differential cross section data with the help of exact impact parameter
representation of elastic scattering amplitude. The results obtained for $pp$
scattering at energy of 53 GeV and $\bar{p} p$ scattering at energy of 541 GeV
have been presented. They indicate that nucleons can be regarded as objects
characterized by a small core (diameter $\sim$ 0.4$\div$0.8 fm) and a half
transparent outer shell (responsible mainly for elastic hadron scattering).
| [
{
"created": "Thu, 6 Jan 2000 13:37:06 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kundrat",
"Vojtech",
""
],
[
"Lokajicek",
"Milos",
""
],
[
"Krupa",
"D.",
""
]
] | The elastic and inelastic profiles have been derived from the measured elastic differential cross section data with the help of exact impact parameter representation of elastic scattering amplitude. The results obtained for $pp$ scattering at energy of 53 GeV and $\bar{p} p$ scattering at energy of 541 GeV have been presented. They indicate that nucleons can be regarded as objects characterized by a small core (diameter $\sim$ 0.4$\div$0.8 fm) and a half transparent outer shell (responsible mainly for elastic hadron scattering). |
2204.08195 | Yu-Chen Guo | Ji-Chong Yang, Zhi-Bin Qing, Xue-Ying Han, Yu-Chen Guo, Tong Li | Tri-photon at muon collider: a new process to probe the anomalous
quartic gauge couplings | 19 pages, 6 figures,6 tables; References have been updated in the
replacement | JHEP 07 (2022) 053 | 10.1007/JHEP07(2022)053 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The muon collider has recently received a great deal of attention because of
its ability to achieve both high energy and high luminosity. It plays as a
gauge boson collider because the vector boson scattering (VBS) becomes the
dominant production topology for Standard Model processes starting from a few
TeV of collision energy. In this paper, we propose that the process of
$\mu^+\mu^-$ annihilation into tri-photon is also very sensitive to the search
of anomalous quartic gauge couplings (aQGCs). We investigate the projected
constraints on the transverse operators contributing to aQGCs through
$\mu^+\mu^-\to Z^\ast/\gamma^\ast\to \gamma\gamma\gamma$ at muon colliders. For
the muon collider with $\sqrt{s}=3$ TeV and $\mathcal{L}=1\;{\rm ab}^{-1}$, the
expected constraints are about two orders of magnitude stronger than those at
the 13 TeV LHC.
| [
{
"created": "Mon, 18 Apr 2022 07:18:21 GMT",
"version": "v1"
},
{
"created": "Sun, 26 Jun 2022 13:03:45 GMT",
"version": "v2"
},
{
"created": "Tue, 12 Jul 2022 12:01:00 GMT",
"version": "v3"
},
{
"created": "Fri, 20 Oct 2023 10:23:59 GMT",
"version": "v4"
}
] | 2023-10-23 | [
[
"Yang",
"Ji-Chong",
""
],
[
"Qing",
"Zhi-Bin",
""
],
[
"Han",
"Xue-Ying",
""
],
[
"Guo",
"Yu-Chen",
""
],
[
"Li",
"Tong",
""
]
] | The muon collider has recently received a great deal of attention because of its ability to achieve both high energy and high luminosity. It plays as a gauge boson collider because the vector boson scattering (VBS) becomes the dominant production topology for Standard Model processes starting from a few TeV of collision energy. In this paper, we propose that the process of $\mu^+\mu^-$ annihilation into tri-photon is also very sensitive to the search of anomalous quartic gauge couplings (aQGCs). We investigate the projected constraints on the transverse operators contributing to aQGCs through $\mu^+\mu^-\to Z^\ast/\gamma^\ast\to \gamma\gamma\gamma$ at muon colliders. For the muon collider with $\sqrt{s}=3$ TeV and $\mathcal{L}=1\;{\rm ab}^{-1}$, the expected constraints are about two orders of magnitude stronger than those at the 13 TeV LHC. |
hep-ph/9806486 | Tao Han | T. Han, M. Hosch, K. Whisnant, Bing-Lin Young and X. Zhang | Single Top Quark Production via FCNC Couplings at Hadron Colliders | 18 pages, 6 figures, 3 tables | Phys. Rev. D 58, 073008 (1998) | 10.1103/PhysRevD.58.073008 | AMES-HET-98-07, MADPH-98-1052 | hep-ph hep-ex | null | We calculate single top-quark production at hadron colliders via the
chromo-magnetic flavor-changing neutral current couplings $\bar tcg$ and $\bar
tug$. We find that the strength for the anomalous $\bar tcg$ ($\bar tug$)
coupling may be probed to $\kappa_c / \Lambda = 0.092 {TeV}^{-1}$ ($\kappa_u /
\Lambda = 0.026 {TeV}^{-1}$) at the Tevatron with $2 {fb}^{-1}$ of data and
$\kappa_c / \Lambda = 0.013 {TeV}^{-1}$ ($\kappa_u / \Lambda = 0.0061
{TeV}^{-1}$) at the LHC with $10 {fb}^{-1}$ of data. The two couplings may be
distinguished by a comparision of the single top signal with the direct top and
top decay signals for these couplings.
| [
{
"created": "Thu, 25 Jun 1998 18:24:14 GMT",
"version": "v1"
}
] | 2016-08-25 | [
[
"Han",
"T.",
""
],
[
"Hosch",
"M.",
""
],
[
"Whisnant",
"K.",
""
],
[
"Young",
"Bing-Lin",
""
],
[
"Zhang",
"X.",
""
]
] | We calculate single top-quark production at hadron colliders via the chromo-magnetic flavor-changing neutral current couplings $\bar tcg$ and $\bar tug$. We find that the strength for the anomalous $\bar tcg$ ($\bar tug$) coupling may be probed to $\kappa_c / \Lambda = 0.092 {TeV}^{-1}$ ($\kappa_u / \Lambda = 0.026 {TeV}^{-1}$) at the Tevatron with $2 {fb}^{-1}$ of data and $\kappa_c / \Lambda = 0.013 {TeV}^{-1}$ ($\kappa_u / \Lambda = 0.0061 {TeV}^{-1}$) at the LHC with $10 {fb}^{-1}$ of data. The two couplings may be distinguished by a comparision of the single top signal with the direct top and top decay signals for these couplings. |
1203.5293 | Jian Zhou Mr. | Andreas Sch\"afer, Jian Zhou | A note on the scale evolution of the ETQS function T_F(x,x) | 6 pages, 1 figure | null | 10.1103/PhysRevD.85.117501 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We reexamine the scale dependence of the ETQS (Efremov-Teryaev-Qiu-Sterman)
twist-3 matrix element which has been studied already by the four different
groups with conflicting results Ref.[1-4]. We find that we can in fact
reproduce the results of Ref.[4] with the method Ref.[4] when we treat some
subtleties with greater care, thus easing the mentioned conflict.
| [
{
"created": "Fri, 23 Mar 2012 16:52:51 GMT",
"version": "v1"
}
] | 2013-05-30 | [
[
"Schäfer",
"Andreas",
""
],
[
"Zhou",
"Jian",
""
]
] | We reexamine the scale dependence of the ETQS (Efremov-Teryaev-Qiu-Sterman) twist-3 matrix element which has been studied already by the four different groups with conflicting results Ref.[1-4]. We find that we can in fact reproduce the results of Ref.[4] with the method Ref.[4] when we treat some subtleties with greater care, thus easing the mentioned conflict. |
2404.16091 | Vinicius Mikuni | Vinicius Mikuni, Benjamin Nachman | OmniLearn: A Method to Simultaneously Facilitate All Jet Physics Tasks | 19 pages, 12 figures | null | null | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | Machine learning has become an essential tool in jet physics. Due to their
complex, high-dimensional nature, jets can be explored holistically by neural
networks in ways that are not possible manually. However, innovations in all
areas of jet physics are proceeding in parallel. We show that specially
constructed machine learning models trained for a specific jet classification
task can improve the accuracy, precision, or speed of all other jet physics
tasks. This is demonstrated by training on a particular multiclass
classification task and then using the learned representation for different
classification tasks, for datasets with a different (full) detector simulation,
for jets from a different collision system ($pp$ versus $ep$), for generative
models, for likelihood ratio estimation, and for anomaly detection. Our
OmniLearn approach is thus a foundation model and is made publicly available
for use in any area where state-of-the-art precision is required for analyses
involving jets and their substructure.
| [
{
"created": "Wed, 24 Apr 2024 18:00:01 GMT",
"version": "v1"
}
] | 2024-04-26 | [
[
"Mikuni",
"Vinicius",
""
],
[
"Nachman",
"Benjamin",
""
]
] | Machine learning has become an essential tool in jet physics. Due to their complex, high-dimensional nature, jets can be explored holistically by neural networks in ways that are not possible manually. However, innovations in all areas of jet physics are proceeding in parallel. We show that specially constructed machine learning models trained for a specific jet classification task can improve the accuracy, precision, or speed of all other jet physics tasks. This is demonstrated by training on a particular multiclass classification task and then using the learned representation for different classification tasks, for datasets with a different (full) detector simulation, for jets from a different collision system ($pp$ versus $ep$), for generative models, for likelihood ratio estimation, and for anomaly detection. Our OmniLearn approach is thus a foundation model and is made publicly available for use in any area where state-of-the-art precision is required for analyses involving jets and their substructure. |
1804.00938 | Wei-Hong Liang | Wei-Hong Liang, E. Oset | Pseudoscalar or vector meson production in non-leptonic decays of heavy
hadrons | 54 pages, 7 figures, 13 tables; v2: 60 pages, 9 figures, 14 tables,
discussion added, references added, version to appear in Eur.Phys.J. C | null | 10.1140/epjc/s10052-018-5997-4 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have addressed the study of non-leptonic weak decays of heavy hadrons
($\Lambda_b, \Lambda_c, B$ and $D$), with external and internal emission to
give two final hadrons, taking into account the spin-angular momentum structure
of the mesons and baryons produced.
A detailed angular momentum formulation is developed which leads to easy
final formulas. By means of them we have made predictions for a large amount of
reactions, up to a global factor, common to many of them, that we take from
some particular data. Comparing the theoretical predictions with the
experimental data, the agreement found is quite good in general and the
discrepancies should give valuable information on intrinsic form factors,
independent of the spin structure studied here. The formulas obtained are also
useful in order to evaluate meson-meson or meson-baryon loops, for instance of
$B$ decays, in which one has PP, PV, VP or VV intermediate states, with P for
pseudoscalar mesons and V for vector meson and lay the grounds for studies of
decays into three final particles.
| [
{
"created": "Tue, 3 Apr 2018 12:51:47 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Jun 2018 15:38:05 GMT",
"version": "v2"
}
] | 2018-08-01 | [
[
"Liang",
"Wei-Hong",
""
],
[
"Oset",
"E.",
""
]
] | We have addressed the study of non-leptonic weak decays of heavy hadrons ($\Lambda_b, \Lambda_c, B$ and $D$), with external and internal emission to give two final hadrons, taking into account the spin-angular momentum structure of the mesons and baryons produced. A detailed angular momentum formulation is developed which leads to easy final formulas. By means of them we have made predictions for a large amount of reactions, up to a global factor, common to many of them, that we take from some particular data. Comparing the theoretical predictions with the experimental data, the agreement found is quite good in general and the discrepancies should give valuable information on intrinsic form factors, independent of the spin structure studied here. The formulas obtained are also useful in order to evaluate meson-meson or meson-baryon loops, for instance of $B$ decays, in which one has PP, PV, VP or VV intermediate states, with P for pseudoscalar mesons and V for vector meson and lay the grounds for studies of decays into three final particles. |
2201.05163 | Markus Huber Q. | Markus Q. Huber, Christian S. Fischer, H\`elios Sanchis-Alepuz | Quenched glueballs in the DSE/BSE framework | 7 pages, 6 figures, 1 table; contribution to the proceedings of the
19th International Conference on Hadron Spectroscopy and Structure in
memoriam Simon Eidelman, Mexico City, July 26-30, 2021 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The spectrum of glueballs with quantum numbers
$J^\mathsf{PC}=0^{\pm+},2^{\pm+},3^{\pm+},4^{\pm+}$ is calculated in quenched
quantum chromodynamics from bound state equations. The input is taken from a
parameter-free calculation of two- and three-point functions. Our results agree
well with lattice results where available and contain also some additional
states. For the scalar glueball, we present first results for the effects of
additional diagrams which turn out to be strongly suppressed.
| [
{
"created": "Thu, 13 Jan 2022 19:00:01 GMT",
"version": "v1"
}
] | 2022-01-17 | [
[
"Huber",
"Markus Q.",
""
],
[
"Fischer",
"Christian S.",
""
],
[
"Sanchis-Alepuz",
"Hèlios",
""
]
] | The spectrum of glueballs with quantum numbers $J^\mathsf{PC}=0^{\pm+},2^{\pm+},3^{\pm+},4^{\pm+}$ is calculated in quenched quantum chromodynamics from bound state equations. The input is taken from a parameter-free calculation of two- and three-point functions. Our results agree well with lattice results where available and contain also some additional states. For the scalar glueball, we present first results for the effects of additional diagrams which turn out to be strongly suppressed. |
1302.5583 | John W. Moffat | J. W. Moffat | Quarkonium Resonance Model of the 125 GeV Boson | 9 pages, no figures. arXiv admin note: text overlap with
arXiv:1211.2746 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A quarkonium model of the recently discovered X boson at 125 GeV is
investigated. Two isosinglet $J^{PC}=0^{-+}$ resonances $\zeta$ and $\zeta'$
mix and their masses are determined by the masses of the bottomonium and
toponium eigenstates. This mixing is enhanced by the non-perturbative gluon
interaction produced by an axial $U_A(1)$ anomaly. The resonance $\zeta$ is
identified with the 125 GeV boson X, while the heavier $\zeta'$ resonance has a
mass 230 GeV. We assess the most recent data for the decay mode $X\rightarrow
ZZ^*\rightarrow$ 4 leptons with a critical discussion of the determination of
the parity of the $X$ boson.
| [
{
"created": "Fri, 22 Feb 2013 13:31:09 GMT",
"version": "v1"
}
] | 2013-02-25 | [
[
"Moffat",
"J. W.",
""
]
] | A quarkonium model of the recently discovered X boson at 125 GeV is investigated. Two isosinglet $J^{PC}=0^{-+}$ resonances $\zeta$ and $\zeta'$ mix and their masses are determined by the masses of the bottomonium and toponium eigenstates. This mixing is enhanced by the non-perturbative gluon interaction produced by an axial $U_A(1)$ anomaly. The resonance $\zeta$ is identified with the 125 GeV boson X, while the heavier $\zeta'$ resonance has a mass 230 GeV. We assess the most recent data for the decay mode $X\rightarrow ZZ^*\rightarrow$ 4 leptons with a critical discussion of the determination of the parity of the $X$ boson. |
1105.6070 | Florian Goertz | Florian Goertz | Higgs Physics in Warped Extra Dimensions | Talk given at 46th Rencontres de Moriond (Electroweak Session), La
Thuile, March 13-20, 2011, 4 pages, 2 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this talk, I present results for the most important Higgs-boson production
cross sections at the LHC and the Tevatron as well as the branching fractions
of the relevant decay channels in the custodial Randall-Sundrum model. The
results are based on a complete one-loop calculation, taking into account all
possible Kaluza-Klein particles in the loop. Due to the strong infrared
localization of the top quark and the Kaluza-Klein excitations, the SM
predictions receive sizable corrections in the model at hand. This could effect
Higgs searches significantly.
| [
{
"created": "Mon, 30 May 2011 19:04:20 GMT",
"version": "v1"
}
] | 2011-05-31 | [
[
"Goertz",
"Florian",
""
]
] | In this talk, I present results for the most important Higgs-boson production cross sections at the LHC and the Tevatron as well as the branching fractions of the relevant decay channels in the custodial Randall-Sundrum model. The results are based on a complete one-loop calculation, taking into account all possible Kaluza-Klein particles in the loop. Due to the strong infrared localization of the top quark and the Kaluza-Klein excitations, the SM predictions receive sizable corrections in the model at hand. This could effect Higgs searches significantly. |
1903.05267 | Sarunas Verner | John Ellis, Dimitri V. Nanopoulos, Keith A. Olive, Sarunas Verner | A Unified No-Scale Model of Modulus Fixing, Inflation, Supersymmetry
Breaking and Dark Energy | 6 pages, 1 figure, v2: discussion on phase transitions updated,
matches the published version | Phys. Rev. D 100, 025009 (2019) | 10.1103/PhysRevD.100.025009 | KCL-PH-TH/2019-24, CERN-TH-2019-024, ACT-01-19, MI-TH-1917,
UMN-TH-3820/19, FTPI-MINN-19/11 | hep-ph astro-ph.CO gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a minimal SU(2,1)/SU(2) x U(1) no-scale model that incorporates in
an economical way modulus fixing, Starobinsky-like inflation, an adjustable
scale for supersymmetry breaking and the possibility of a small cosmological
constant, a.k.a. dark energy.
| [
{
"created": "Tue, 12 Mar 2019 23:53:33 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Nov 2019 15:28:56 GMT",
"version": "v2"
}
] | 2019-11-22 | [
[
"Ellis",
"John",
""
],
[
"Nanopoulos",
"Dimitri V.",
""
],
[
"Olive",
"Keith A.",
""
],
[
"Verner",
"Sarunas",
""
]
] | We present a minimal SU(2,1)/SU(2) x U(1) no-scale model that incorporates in an economical way modulus fixing, Starobinsky-like inflation, an adjustable scale for supersymmetry breaking and the possibility of a small cosmological constant, a.k.a. dark energy. |
1611.06676 | Jorge Martin Camalich Jorge Martin Camalich | Rodrigo Alonso, Benjam\'in Grinstein and Jorge Martin Camalich | The lifetime of the $B_c^-$ meson and the anomalies in $B\to
D^{(*)}\tau\nu$ | 6 pages, 2 figs | Phys. Rev. Lett. 118, 081802 (2017) | 10.1103/PhysRevLett.118.081802 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate a new constraint on new-physics interpretations of the
anomalies observed in $B\to D^{(*)}\tau\nu$ decays making use of the lifetime
of the $B_c^-$ meson. A constraint is obtained by demanding that the rate for
$B_c^-\to\tau^-\bar\nu$ does not exceed the fraction of the total width that is
allowed by the calculation of the lifetime in the standard model. This leads to
a very strong bound on new-physics scenarios involving scalar operators since
they lift the slight, but not negligible, chiral suppression of the
$B_c^-\to\tau^-\bar\nu$ amplitude in the standard model. The new constraint
renders a scalar interpretation of the enhancement measured in $R_{D^*}$
implausible, including explanations implementing extra Higgs doublets or
certain classes of leptoquarks. We also discuss the complementarity of
$R_{D^{(*)}}$ and a measurement of the longitudinal polarization of the $\tau$
in the $B\to D^*\tau\nu$ decay in light of our findings.
| [
{
"created": "Mon, 21 Nov 2016 08:15:03 GMT",
"version": "v1"
}
] | 2017-03-01 | [
[
"Alonso",
"Rodrigo",
""
],
[
"Grinstein",
"Benjamín",
""
],
[
"Camalich",
"Jorge Martin",
""
]
] | We investigate a new constraint on new-physics interpretations of the anomalies observed in $B\to D^{(*)}\tau\nu$ decays making use of the lifetime of the $B_c^-$ meson. A constraint is obtained by demanding that the rate for $B_c^-\to\tau^-\bar\nu$ does not exceed the fraction of the total width that is allowed by the calculation of the lifetime in the standard model. This leads to a very strong bound on new-physics scenarios involving scalar operators since they lift the slight, but not negligible, chiral suppression of the $B_c^-\to\tau^-\bar\nu$ amplitude in the standard model. The new constraint renders a scalar interpretation of the enhancement measured in $R_{D^*}$ implausible, including explanations implementing extra Higgs doublets or certain classes of leptoquarks. We also discuss the complementarity of $R_{D^{(*)}}$ and a measurement of the longitudinal polarization of the $\tau$ in the $B\to D^*\tau\nu$ decay in light of our findings. |
1606.05754 | Ricardo Farias | Sidney S. Avancini, Ricardo L. S. Farias, Marcus Benghi Pinto, William
R. Tavares and Varese S. Tim\'oteo | $\pi_0$ pole mass calculation in a strong magnetic field and lattice
constraints | 7 pages, 5 figures, v2 PLB version | null | 10.1016/j.physletb.2017.02.002 | null | hep-ph hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The $\pi_0$ neutral meson pole mass is calculated in a strongly magnetized
medium using the SU(2) Nambu-Jona-Lasinio model within the random phase
approximation (RPA) at zero temperature and zero baryonic density. We employ a
magnetic field dependent coupling, $G(eB)$, fitted to reproduce lattice QCD
results for the quark condensates. Divergent quantities are handled with a
magnetic field independent regularization scheme in order to avoid unphysical
oscillations. A comparison between the running and the fixed couplings reveals
that the former produces results much closer to the predictions from recent
lattice calculations. In particular, we find that the $\pi_0$ meson mass
systematically decreases when the magnetic field increases while the scalar
mass remains almost constant. We also investigate how the magnetic background
influences other mesonic properties such as $f_{{\pi}_0}$ and $g_{\pi_0 q q}$.
| [
{
"created": "Sat, 18 Jun 2016 14:13:09 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Feb 2017 20:04:37 GMT",
"version": "v2"
}
] | 2017-02-23 | [
[
"Avancini",
"Sidney S.",
""
],
[
"Farias",
"Ricardo L. S.",
""
],
[
"Pinto",
"Marcus Benghi",
""
],
[
"Tavares",
"William R.",
""
],
[
"Timóteo",
"Varese S.",
""
]
] | The $\pi_0$ neutral meson pole mass is calculated in a strongly magnetized medium using the SU(2) Nambu-Jona-Lasinio model within the random phase approximation (RPA) at zero temperature and zero baryonic density. We employ a magnetic field dependent coupling, $G(eB)$, fitted to reproduce lattice QCD results for the quark condensates. Divergent quantities are handled with a magnetic field independent regularization scheme in order to avoid unphysical oscillations. A comparison between the running and the fixed couplings reveals that the former produces results much closer to the predictions from recent lattice calculations. In particular, we find that the $\pi_0$ meson mass systematically decreases when the magnetic field increases while the scalar mass remains almost constant. We also investigate how the magnetic background influences other mesonic properties such as $f_{{\pi}_0}$ and $g_{\pi_0 q q}$. |
hep-ph/0609229 | Hai-Yang Cheng | Hai-Yang Cheng | Mixing of Scalar Glueball and Scalar Quarkonia | 4 pages, 1 figure, talk presented at the XXXIII International
Conference on High Energy Physics, Moscow, July 26-August 2, 2006 | null | null | null | hep-ph | null | The isosinglet scalar mesons $f_0(1710)$, $f_0(1500)$, $f_0(1370)$ and their
mixing are studied. Two recent lattice results are employed as the starting
point; one is the approximate SU(3) symmetry in the scalar sector above 1 GeV
for the connected insertion part without $q\bar q$ annihilation, and the other
is the scalar glueball mass at 1710 MeV in the quenched approximation. In the
SU(3) symmetry limit, $f_0(1500)$ becomes a pure SU(3) octet and is degenerate
with $a_0(1450)$, while $f_0(1370)$ is mainly an SU(3) singlet with a slight
mixing with the scalar glueball which is the primary component of $f_0(1710)$.
These features remain essentially unchanged even when SU(3) breaking is taken
into account. The observed enhancement of $\omega f_0(1710)$ production over
$\phi f_0(1710)$ in hadronic $J/\psi$ decays and the copious $f_0(1710)$
production in radiative $J/\psi$ decays lend further support to the prominent
glueball nature of $f_0(1710)$.
| [
{
"created": "Thu, 21 Sep 2006 22:35:11 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Cheng",
"Hai-Yang",
""
]
] | The isosinglet scalar mesons $f_0(1710)$, $f_0(1500)$, $f_0(1370)$ and their mixing are studied. Two recent lattice results are employed as the starting point; one is the approximate SU(3) symmetry in the scalar sector above 1 GeV for the connected insertion part without $q\bar q$ annihilation, and the other is the scalar glueball mass at 1710 MeV in the quenched approximation. In the SU(3) symmetry limit, $f_0(1500)$ becomes a pure SU(3) octet and is degenerate with $a_0(1450)$, while $f_0(1370)$ is mainly an SU(3) singlet with a slight mixing with the scalar glueball which is the primary component of $f_0(1710)$. These features remain essentially unchanged even when SU(3) breaking is taken into account. The observed enhancement of $\omega f_0(1710)$ production over $\phi f_0(1710)$ in hadronic $J/\psi$ decays and the copious $f_0(1710)$ production in radiative $J/\psi$ decays lend further support to the prominent glueball nature of $f_0(1710)$. |
hep-ph/0309332 | Sangyong Jeon | Sangyong Jeon and Guy D. Moore | Energy Loss of Leading Partons in a Thermal QCD Medium | 4 pages using revtex4. Includes 3 eps figures | Phys.Rev. C71 (2005) 034901 | 10.1103/PhysRevC.71.034901 | null | hep-ph nucl-th | null | We consider bremsstrahlung energy loss for hard partons traversing a
quark-gluon plasma. Accounting correctly for the probabilistic nature of the
energy loss, and making a leading-order accurate treatment of bremsstrahlung,
we find that the suppression of the spectrum is nearly flat, with the most
suppression at energies $E \sim 30 T$ ($T$ the QGP temperature), in contrast to
previous literature but in agreement with experimental data. This flat pattern
should also be observed at the LHC.
| [
{
"created": "Mon, 29 Sep 2003 20:42:52 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Jeon",
"Sangyong",
""
],
[
"Moore",
"Guy D.",
""
]
] | We consider bremsstrahlung energy loss for hard partons traversing a quark-gluon plasma. Accounting correctly for the probabilistic nature of the energy loss, and making a leading-order accurate treatment of bremsstrahlung, we find that the suppression of the spectrum is nearly flat, with the most suppression at energies $E \sim 30 T$ ($T$ the QGP temperature), in contrast to previous literature but in agreement with experimental data. This flat pattern should also be observed at the LHC. |
1207.7094 | Leticia Faria Domingues Palhares | Eduardo S. Fraga, Jorge Noronha and Leticia F. Palhares | Large Nc Deconfinement Transition in the Presence of a Magnetic Field | 5 pages, 1 figure; v2: version accepted for publication in Phys. Rev.
D | Phys. Rev. D 87, 114014 (2013) | 10.1103/PhysRevD.87.114014 | null | hep-ph hep-lat hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the effect of a homogeneous magnetic field on the thermal
deconfinement transition of QCD in the large $N_c$ limit. First we discuss how
the critical temperature decreases due to the inclusion of $N_f \ll N_c$
flavors of massless quarks. Then we study the equivalent correction in the
presence of an external Abelian magnetic field. To leading order in
$N_{f}/N_{c}$, the fact that the deconfinement critical temperature decreases
with the magnetic field depends solely on quarks behaving paramagnetically.
Finally, we discuss the effects from a finite quark mass and its competition
with magnetic effects.
| [
{
"created": "Mon, 30 Jul 2012 20:42:56 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Jun 2013 09:01:00 GMT",
"version": "v2"
}
] | 2013-08-08 | [
[
"Fraga",
"Eduardo S.",
""
],
[
"Noronha",
"Jorge",
""
],
[
"Palhares",
"Leticia F.",
""
]
] | We investigate the effect of a homogeneous magnetic field on the thermal deconfinement transition of QCD in the large $N_c$ limit. First we discuss how the critical temperature decreases due to the inclusion of $N_f \ll N_c$ flavors of massless quarks. Then we study the equivalent correction in the presence of an external Abelian magnetic field. To leading order in $N_{f}/N_{c}$, the fact that the deconfinement critical temperature decreases with the magnetic field depends solely on quarks behaving paramagnetically. Finally, we discuss the effects from a finite quark mass and its competition with magnetic effects. |
hep-ph/0302221 | Luis Lavoura | L. Lavoura | General formulae for f1 --> f2 gamma | 11 pages LATEX | Eur.Phys.J.C29:191-195,2003 | 10.1140/epjc/s2003-01212-7 | null | hep-ph | null | At one-loop level the decay f1 --> f2 gamma, where f1 and f2 are two spin-1/2
particles with the same electric charge, is mediated by a boson B and a
spin-1/2 fermion F. The boson B may have either spin 0 - interacting with the
fermions through Dirac matrices 1 and gamma5 - or spin 1 - with V+A and V-A
couplings to the fermions. I give general formulae for the one-loop electroweak
amplitude of f1 --> f2 gamma in all these cases.
| [
{
"created": "Tue, 25 Feb 2003 10:44:22 GMT",
"version": "v1"
}
] | 2009-01-07 | [
[
"Lavoura",
"L.",
""
]
] | At one-loop level the decay f1 --> f2 gamma, where f1 and f2 are two spin-1/2 particles with the same electric charge, is mediated by a boson B and a spin-1/2 fermion F. The boson B may have either spin 0 - interacting with the fermions through Dirac matrices 1 and gamma5 - or spin 1 - with V+A and V-A couplings to the fermions. I give general formulae for the one-loop electroweak amplitude of f1 --> f2 gamma in all these cases. |
2001.01237 | Ligong Bian | Ruiyu Zhou, Ligong Bian | Gravitational wave and electroweak baryogenesis with two Higgs doublet
models | 7 pages, 5 figures, PLB published version | Phys.Lett.B 829 (2022) 137105 | 10.1016/j.physletb.2022.137105 | null | hep-ph astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | We study stochastic gravitational wave production and baryon number
generation at electroweak phase transition with the two Higgs doublet models.
The produced stochastic gravitational wave during the strongly first-order
phase transition can be probed by future space-based interferometers. The {\it
nonlocal} electroweak baryogengesis cannot address the observed Baryon
asymmetry of the Universe successfully in the strongly first-order phase
transition parameter spaces due to the CP violation phase is severely bounded
by the electron electric dipole moment measurement ACMEII.
| [
{
"created": "Sun, 5 Jan 2020 13:45:38 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Apr 2022 03:22:42 GMT",
"version": "v2"
}
] | 2022-04-19 | [
[
"Zhou",
"Ruiyu",
""
],
[
"Bian",
"Ligong",
""
]
] | We study stochastic gravitational wave production and baryon number generation at electroweak phase transition with the two Higgs doublet models. The produced stochastic gravitational wave during the strongly first-order phase transition can be probed by future space-based interferometers. The {\it nonlocal} electroweak baryogengesis cannot address the observed Baryon asymmetry of the Universe successfully in the strongly first-order phase transition parameter spaces due to the CP violation phase is severely bounded by the electron electric dipole moment measurement ACMEII. |
hep-ph/9710220 | null | Minako Kitahara, Miho Marui, Noriyuki Oshimo, Tomomi Saito, and Akio
Sugamoto | CP-odd Anomalous W-boson Couplings from Supersymmety | Latex file, 11 pages, 8 Postscript figures | Eur.Phys.J.C4:661-667,1998 | 10.1007/s100520050235 | ICRR-Report-399-97-22,OCHA-PP-82,kure-pp/97-02 | hep-ph | null | The supersymmetric standard model contains a new CP-violating phase in the
mass matrices for charginos and neutralinos, which could induce CP-odd
anomalous couplings for the WWZ and WW\gamma vertices at the one-loop level. We
study these couplings, paying attention to the model-parameter and q^2
dependencies. It is shown that the CP-odd form factors could have values of
order 10^{-3}-10^{-4}, which are much larger than those predicted by the
standard model. We also discuss the possibility of examining these form factors
in experiments.
| [
{
"created": "Thu, 2 Oct 1997 10:19:14 GMT",
"version": "v1"
}
] | 2019-08-17 | [
[
"Kitahara",
"Minako",
""
],
[
"Marui",
"Miho",
""
],
[
"Oshimo",
"Noriyuki",
""
],
[
"Saito",
"Tomomi",
""
],
[
"Sugamoto",
"Akio",
""
]
] | The supersymmetric standard model contains a new CP-violating phase in the mass matrices for charginos and neutralinos, which could induce CP-odd anomalous couplings for the WWZ and WW\gamma vertices at the one-loop level. We study these couplings, paying attention to the model-parameter and q^2 dependencies. It is shown that the CP-odd form factors could have values of order 10^{-3}-10^{-4}, which are much larger than those predicted by the standard model. We also discuss the possibility of examining these form factors in experiments. |
0704.0627 | Joao Pacheco B. C. de Melo Dr. | Fabiano P. Pereira (Instituto de Fisica, Universidade Federal
Fluminense, Niteroi, RJ, Brazil), J. P. B. C. de Melo (Universidade Cruzeiro
do Sul, CETEC, Sao Paulo, SP, Brazil), T. Frederico (Instituto Tecnologico de
Aeronautica, Sao Jose dos Campos, SP, Brazil) and Lauro Tomio (Instituto de
Fisica Teorica, UNESP, Sao Paulo, SP, Brazil) | Electromagnetic structure and weak decay of meson K in a light-front
QCD-inspired | 4 pages and 1 figure eps. To appear Nucl. Phys. A (2007) | Nucl.Phys.A610:610-613,2007 | 10.1016/j.nuclphysa.2007.03.103 | null | hep-ph nucl-th | null | The kaon electromagnetic (e.m.) form factor is reviewed considering a
light-front constituent quark model. In this approach, it is discussed the
relevance of the quark-antiquark pair terms for the full covariance of the e.m.
current. It is also verified, by considering a QCD dynamical model, that a good
agreement with experimental data can be obtained for the kaon weak decay
constant once a probability of about 80% of the valence component is taken into
account.
| [
{
"created": "Wed, 4 Apr 2007 17:48:40 GMT",
"version": "v1"
}
] | 2009-11-13 | [
[
"Pereira",
"Fabiano P.",
"",
"Instituto de Fisica, Universidade Federal\n Fluminense, Niteroi, RJ, Brazil"
],
[
"de Melo",
"J. P. B. C.",
"",
"Universidade Cruzeiro\n do Sul, CETEC, Sao Paulo, SP, Brazil"
],
[
"Frederico",
"T.",
"",
"Instituto Tecnologico de\n Aeronautica, Sao Jose dos Campos, SP, Brazil"
],
[
"Tomio",
"Lauro",
"",
"Instituto de\n Fisica Teorica, UNESP, Sao Paulo, SP, Brazil"
]
] | The kaon electromagnetic (e.m.) form factor is reviewed considering a light-front constituent quark model. In this approach, it is discussed the relevance of the quark-antiquark pair terms for the full covariance of the e.m. current. It is also verified, by considering a QCD dynamical model, that a good agreement with experimental data can be obtained for the kaon weak decay constant once a probability of about 80% of the valence component is taken into account. |
2105.00877 | Seungwon Baek | Seungwon Baek | Inelastic dark matter, small scale problems, and the XENON1T excess | 13 pages, 1 figure | JHEP10 (2021) 135 | 10.1007/JHEP10(2021)135 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We study a generic model in which the dark sector is composed of a Majorana
dark matter $\chi_1$, its excited state $\chi_2$, both at the electroweak
scale, and a light dark photon $Z'$ with $m_{Z'} \sim 10^{-4}$ eV. The light
$Z'$ enhances the self-scattering elastic cross section $\chi_1 \chi_1 \to
\chi_1 \chi_1$ enough to solve the small scale problems in the $N$-body
simulations with the cold dark matter. The dark matter communicates with the SM
via kinetic mixing parameterized by $\epsilon$. The inelastic scattering
process $\chi_1 \chi_1 \to \chi_2 \chi_2$ followed by the prompt decay $\chi_2
\to \chi_1 Z'$ generates energetic $Z'$. By setting $\delta \equiv m_{\chi_2} -
m_{\chi_1} \simeq 2.8$ keV and $\epsilon \sim 10^{-10}$ the excess in the
electron-recoil data at the XENON1T experiment can be explained by the
dark-photoelectric effect. The relic abundance of the dark matter can also be
accommodated by the thermal freeze-out mechanism via the annihilation $\chi_1
\chi_1 (\chi_2 \chi_2) \to Z' Z'$ with the dark gauge coupling constant
$\alpha_X \sim 10^{-3}$.
| [
{
"created": "Mon, 3 May 2021 14:00:06 GMT",
"version": "v1"
},
{
"created": "Tue, 11 May 2021 06:24:44 GMT",
"version": "v2"
},
{
"created": "Fri, 22 Oct 2021 01:44:32 GMT",
"version": "v3"
}
] | 2021-11-03 | [
[
"Baek",
"Seungwon",
""
]
] | We study a generic model in which the dark sector is composed of a Majorana dark matter $\chi_1$, its excited state $\chi_2$, both at the electroweak scale, and a light dark photon $Z'$ with $m_{Z'} \sim 10^{-4}$ eV. The light $Z'$ enhances the self-scattering elastic cross section $\chi_1 \chi_1 \to \chi_1 \chi_1$ enough to solve the small scale problems in the $N$-body simulations with the cold dark matter. The dark matter communicates with the SM via kinetic mixing parameterized by $\epsilon$. The inelastic scattering process $\chi_1 \chi_1 \to \chi_2 \chi_2$ followed by the prompt decay $\chi_2 \to \chi_1 Z'$ generates energetic $Z'$. By setting $\delta \equiv m_{\chi_2} - m_{\chi_1} \simeq 2.8$ keV and $\epsilon \sim 10^{-10}$ the excess in the electron-recoil data at the XENON1T experiment can be explained by the dark-photoelectric effect. The relic abundance of the dark matter can also be accommodated by the thermal freeze-out mechanism via the annihilation $\chi_1 \chi_1 (\chi_2 \chi_2) \to Z' Z'$ with the dark gauge coupling constant $\alpha_X \sim 10^{-3}$. |
1808.02115 | Luciano Abreu | L. M. Abreu, E. Cavalcanti and A. P. C. Malbouisson | Impact of unitarization on the $J/\psi$-light meson cross section | 21 pages, 11 figures | Nuclear Physics A978 (2018) 107 | 10.1016/j.nuclphysa.2018.08.001 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Hidden charm mesons continue playing an essential role as relevant probes to
understand the evolution of partonic matter. It is expected that the charmonia
that survived the quark-gluon plasma phase suffer collisions with other
particles composing the hadronic matter. In this work, we intend to contribute
on this subject by presenting an updated study about the interactions of
$J/\psi$ with surrounding hadronic medium. The meson-meson interactions are
described with a $SU(4)$ effective Lagrangian, and within the framework of
unitarized coupled channel amplitudes projected onto s-wave. The symmetry is
explicitly broken to $SU(3)$ by suppression of the interactions driven by
charmed mesons. We calculate the cross sections for $J/\psi $ scattering by
light pseudoscalar mesons ($\pi, K, \eta$) and vector mesons ($\rho, K^\ast,
\omega$), as well as their inverse processes. Keeping the validity of this
present approach in the low CM energy range, the most relevant channels are
evaluated and a comparison of the findings with existing literature is
performed.
| [
{
"created": "Mon, 6 Aug 2018 21:06:55 GMT",
"version": "v1"
}
] | 2018-08-08 | [
[
"Abreu",
"L. M.",
""
],
[
"Cavalcanti",
"E.",
""
],
[
"Malbouisson",
"A. P. C.",
""
]
] | Hidden charm mesons continue playing an essential role as relevant probes to understand the evolution of partonic matter. It is expected that the charmonia that survived the quark-gluon plasma phase suffer collisions with other particles composing the hadronic matter. In this work, we intend to contribute on this subject by presenting an updated study about the interactions of $J/\psi$ with surrounding hadronic medium. The meson-meson interactions are described with a $SU(4)$ effective Lagrangian, and within the framework of unitarized coupled channel amplitudes projected onto s-wave. The symmetry is explicitly broken to $SU(3)$ by suppression of the interactions driven by charmed mesons. We calculate the cross sections for $J/\psi $ scattering by light pseudoscalar mesons ($\pi, K, \eta$) and vector mesons ($\rho, K^\ast, \omega$), as well as their inverse processes. Keeping the validity of this present approach in the low CM energy range, the most relevant channels are evaluated and a comparison of the findings with existing literature is performed. |
1109.1735 | Stefano Moretti Dr | Mosleh M. Almarashi and Stefano Moretti (Southampton U.) | LHC Signals of a Heavy CP-even Higgs Boson in the NMSSM via Decays into
a $Z$ and a Light CP-odd Higgs State | 4 pages, 4 figures, 1 table | null | 10.1103/PhysRevD.85.017701 | SHEP-11-19 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the $Za_1$ decay mode of a heavy CP-even Higgs boson of the NMSSM,
$h_2$, where $a_1$ is the lightest CP-odd Higgs state of this scenario, the
former produced in association with a bottom-antibottom pair, and find that,
despite small event rates, a significant (in fact essentially background free)
signal should be extractable at the LHC with very high luminosity, so long that
a $Z\to jj$ (where $j$ represents a jet) and $a_1\to \tau^+\tau^-$ final state
is exploited, in presence of $b$-tagging
| [
{
"created": "Thu, 8 Sep 2011 14:52:29 GMT",
"version": "v1"
}
] | 2013-05-30 | [
[
"Almarashi",
"Mosleh M.",
"",
"Southampton U."
],
[
"Moretti",
"Stefano",
"",
"Southampton U."
]
] | We study the $Za_1$ decay mode of a heavy CP-even Higgs boson of the NMSSM, $h_2$, where $a_1$ is the lightest CP-odd Higgs state of this scenario, the former produced in association with a bottom-antibottom pair, and find that, despite small event rates, a significant (in fact essentially background free) signal should be extractable at the LHC with very high luminosity, so long that a $Z\to jj$ (where $j$ represents a jet) and $a_1\to \tau^+\tau^-$ final state is exploited, in presence of $b$-tagging |
1603.05074 | Peihong Gu | Wen-Bin Lu, Pei-Hong Gu | Leptogenesis, radiative neutrino masses and inert Higgs triplet dark
matter | 12 pages, 7 figures, references added | null | 10.1088/1475-7516/2016/05/040 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extend the standard model by three types of inert fields including
Majorana fermion singlets/triplets, real Higgs singlets/triplets and leptonic
Higgs doublets. In the presence of a softly broken lepton number and an exactly
conserved Z_2 discrete symmetry, these inert fields together can mediate a
one-loop diagram for a Majorana neutrino mass generation. The heavier inert
fields can decay to realize a successful leptogenesis while the lightest inert
field can provide a stable dark matter candidate. As an example, we demonstrate
the leptogenesis by the inert Higgs doublet decays. We also perform a
systematic study on the inert Higgs triplet dark matter scenario where the
interference between the gauge and Higgs portal interactions can significantly
affect the dark matter properties.
| [
{
"created": "Wed, 16 Mar 2016 12:59:41 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Sep 2016 12:58:20 GMT",
"version": "v2"
}
] | 2016-09-07 | [
[
"Lu",
"Wen-Bin",
""
],
[
"Gu",
"Pei-Hong",
""
]
] | We extend the standard model by three types of inert fields including Majorana fermion singlets/triplets, real Higgs singlets/triplets and leptonic Higgs doublets. In the presence of a softly broken lepton number and an exactly conserved Z_2 discrete symmetry, these inert fields together can mediate a one-loop diagram for a Majorana neutrino mass generation. The heavier inert fields can decay to realize a successful leptogenesis while the lightest inert field can provide a stable dark matter candidate. As an example, we demonstrate the leptogenesis by the inert Higgs doublet decays. We also perform a systematic study on the inert Higgs triplet dark matter scenario where the interference between the gauge and Higgs portal interactions can significantly affect the dark matter properties. |
hep-ph/9505443 | Rafel Escribano | R. Escribano, E. Masso and R. Toldra | THE ORTHOPOSITRONIUM DECAY PUZZLE AND PRIMORDIAL NUCLEOSYNTHESIS | 11 pages, LaTeX file, 1 figure in a compressed uuencoded additional
file. Full postscript file available at
ftp://ftp.ifae.es/preprint/ft/uabft366.ps | Phys.Lett. B356 (1995) 313-318 | 10.1016/0370-2693(95)00797-O | UAB-FT-366 | hep-ph astro-ph | null | The discrepancy between the experimental decay rate of orthopositronium
(o-Ps) and the QED theoretical prediction can be solved by invoking decays of
o-Ps into exotic particles with branching ratios of the order of 10^{-3}. We
show that considerations based on primordial nucleosynthesis and effective
Lagrangians place a very stringent upper bound: B = Gamma(o-Ps -> ``exotic'' +
...)/Gamma(o-Ps) <= 2 x 10^{-15}, ruling out the exotic decay solution to the
puzzle.
| [
{
"created": "Wed, 31 May 1995 20:05:38 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Escribano",
"R.",
""
],
[
"Masso",
"E.",
""
],
[
"Toldra",
"R.",
""
]
] | The discrepancy between the experimental decay rate of orthopositronium (o-Ps) and the QED theoretical prediction can be solved by invoking decays of o-Ps into exotic particles with branching ratios of the order of 10^{-3}. We show that considerations based on primordial nucleosynthesis and effective Lagrangians place a very stringent upper bound: B = Gamma(o-Ps -> ``exotic'' + ...)/Gamma(o-Ps) <= 2 x 10^{-15}, ruling out the exotic decay solution to the puzzle. |
1810.04328 | Long-Bin Chen | Long-Bin Chen and Jian Wang | Three-loop planar master integrals for heavy-to-light form factors | 18 pages, 2 figures | null | 10.1016/j.physletb.2018.10.035 | TUM-HEP-1157/18 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate analytically the three-loop planar master integrals relevant for
heavy-to-light form factors using the method of differential equations. After
choosing a proper canonical basis, the boundary conditions are easy to be
determined, and the solution of differential equations is greatly simplified.
The results for seventy-one master integrals at general kinematics are all
expressed in terms of harmonic polylogarithms.
| [
{
"created": "Wed, 10 Oct 2018 01:55:55 GMT",
"version": "v1"
}
] | 2018-10-24 | [
[
"Chen",
"Long-Bin",
""
],
[
"Wang",
"Jian",
""
]
] | We calculate analytically the three-loop planar master integrals relevant for heavy-to-light form factors using the method of differential equations. After choosing a proper canonical basis, the boundary conditions are easy to be determined, and the solution of differential equations is greatly simplified. The results for seventy-one master integrals at general kinematics are all expressed in terms of harmonic polylogarithms. |
1906.02977 | Motoo Suzuki | Masahiro Ibe, Satoshi Shirai, Motoo Suzuki and Tsutomu T. Yanagida | FAKE GUT | 5 pages | Phys. Rev. D 100, 055024 (2019) | 10.1103/PhysRevD.100.055024 | IPMU19-0085 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The perfect fit of the matter fields of the Standard Model (SM) into the
$SU(5)$ multiplets has strongly supported the idea of the Grand Unified Theory
(GUT) for decades. In this paper, we discuss a novel framework which explains
why the SM matter fields form the apparently complete $SU(5)$ multiplets. In
the new framework, the apparent matter unification inevitably results from
chiral $SU(5)$ gauge theory even if the quarks and leptons are not embedded
into the common $SU(5)$ multiplets. We call this class of models the "fake
GUT". The novel phenomenological prediction of the fake GUT is more variety of
the nucleon decay modes than the conventional GUT, which reflects the rich
structure of the origin of the matter fields.
| [
{
"created": "Fri, 7 Jun 2019 09:15:46 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Nov 2019 14:15:57 GMT",
"version": "v2"
}
] | 2019-12-02 | [
[
"Ibe",
"Masahiro",
""
],
[
"Shirai",
"Satoshi",
""
],
[
"Suzuki",
"Motoo",
""
],
[
"Yanagida",
"Tsutomu T.",
""
]
] | The perfect fit of the matter fields of the Standard Model (SM) into the $SU(5)$ multiplets has strongly supported the idea of the Grand Unified Theory (GUT) for decades. In this paper, we discuss a novel framework which explains why the SM matter fields form the apparently complete $SU(5)$ multiplets. In the new framework, the apparent matter unification inevitably results from chiral $SU(5)$ gauge theory even if the quarks and leptons are not embedded into the common $SU(5)$ multiplets. We call this class of models the "fake GUT". The novel phenomenological prediction of the fake GUT is more variety of the nucleon decay modes than the conventional GUT, which reflects the rich structure of the origin of the matter fields. |
1612.03629 | Venus Keus | Venus Keus | CP violation and BSM Higgs bosons | 9 pages, 4 figures, talk given at the Workshop `Charged 2016:
Prospects for Charged Higgs Discovery at Colliders', 3-6 October 2016,
Uppsala, Sweden | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study extensions of the Standard Model (SM) in which copies of the SM
scalar SU(2) doublet are added to the Higgs sector. These scalar doublets
either acquire a Vacuum Expectation Value (VEV) and hence are active or do not
develop a VEV and are inert. We consider CP-violation (CPV) in both the active
and inert sector. As an example of a model with CPV in the active sector, we
present a Type-I 2-Higgs-Doublet Model (2HDM) with two active doublets and show
Large Hadron Collider (LHC) signals of such a scenario. The amount of CPV in
this case is very limited due to constraints coming from Electric Dipole Moment
experiments. Moreover, 2HDMs with only active doublets do not provide a Dark
Matter (DM) candidate. As a result, we turn to 3-Higgs-Doublet Models (3HDMs)
where unbounded CPV and viable DM candidates could be introduced simultaneously
in the inert sector. We investigate DM phenomenology of such models.
| [
{
"created": "Mon, 12 Dec 2016 11:46:52 GMT",
"version": "v1"
}
] | 2016-12-13 | [
[
"Keus",
"Venus",
""
]
] | We study extensions of the Standard Model (SM) in which copies of the SM scalar SU(2) doublet are added to the Higgs sector. These scalar doublets either acquire a Vacuum Expectation Value (VEV) and hence are active or do not develop a VEV and are inert. We consider CP-violation (CPV) in both the active and inert sector. As an example of a model with CPV in the active sector, we present a Type-I 2-Higgs-Doublet Model (2HDM) with two active doublets and show Large Hadron Collider (LHC) signals of such a scenario. The amount of CPV in this case is very limited due to constraints coming from Electric Dipole Moment experiments. Moreover, 2HDMs with only active doublets do not provide a Dark Matter (DM) candidate. As a result, we turn to 3-Higgs-Doublet Models (3HDMs) where unbounded CPV and viable DM candidates could be introduced simultaneously in the inert sector. We investigate DM phenomenology of such models. |
1608.04817 | Xiao-Gang He | N. G. Deshpande, Xiao-Gang He | Consequences of R-Parity violating interactions for anomalies in $\bar
B\to D^{(*)} \tau \bar \nu$ and $b\to s \mu^+\mu^-$ | RevTex, 13 pages, three figures. In our earlier version, we had
neglected a contribution to C^{NP}_9 and obtained erroneous conclusions which
we have corrected them in this version | null | 10.1140/epjc/s10052-017-4707-y | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the possibility of explaining the enhancement in semileptonic
decays of $\bar B \to D^{(*)} \tau \bar \nu$, the anomalies induced by $b\to
s\mu^+\mu^-$ in $\bar B\to (K, K^*, \phi)\mu^+\mu^-$ and violation of lepton
universality in $R_K = Br(\bar B\to K \mu^+\mu^-)/Br(\bar B\to K e^+e^-)$
within the framework of R-parity violating (RPV) MSSM. Exchange of down type
right-handed squark coupled to quarks and leptons yield interactions which are
similar to leptoquark induced interactions that have been proposed to explain
the $\bar B \to D^{(*)} \tau \bar \nu$ by tree level interactions and $b\to s
\mu^+\mu^-$ anomalies by loop induced interactions, simultaneously. However,
the Yukawa couplings in such theories have severe constraints from other rare
processes in $B$ and $D$ decays. Although this interaction can provide a viable
solution to $R(D^{(*)})$ anomaly, we show that with the severe constraint from
$\bar B \to K \nu \bar \nu$, it is impossible to solve the anomalies in $b\to s
\mu^+\mu^-$ process simultaneously.
| [
{
"created": "Wed, 17 Aug 2016 00:21:44 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Aug 2016 22:33:08 GMT",
"version": "v2"
},
{
"created": "Thu, 1 Sep 2016 01:35:13 GMT",
"version": "v3"
},
{
"created": "Thu, 1 Dec 2016 00:48:52 GMT",
"version": "v4"
}
] | 2017-03-08 | [
[
"Deshpande",
"N. G.",
""
],
[
"He",
"Xiao-Gang",
""
]
] | We investigate the possibility of explaining the enhancement in semileptonic decays of $\bar B \to D^{(*)} \tau \bar \nu$, the anomalies induced by $b\to s\mu^+\mu^-$ in $\bar B\to (K, K^*, \phi)\mu^+\mu^-$ and violation of lepton universality in $R_K = Br(\bar B\to K \mu^+\mu^-)/Br(\bar B\to K e^+e^-)$ within the framework of R-parity violating (RPV) MSSM. Exchange of down type right-handed squark coupled to quarks and leptons yield interactions which are similar to leptoquark induced interactions that have been proposed to explain the $\bar B \to D^{(*)} \tau \bar \nu$ by tree level interactions and $b\to s \mu^+\mu^-$ anomalies by loop induced interactions, simultaneously. However, the Yukawa couplings in such theories have severe constraints from other rare processes in $B$ and $D$ decays. Although this interaction can provide a viable solution to $R(D^{(*)})$ anomaly, we show that with the severe constraint from $\bar B \to K \nu \bar \nu$, it is impossible to solve the anomalies in $b\to s \mu^+\mu^-$ process simultaneously. |
1607.08546 | Jonas B. De Araujo | J. B. Araujo, Rodolfo Casana, M. M. Ferreira Jr | General Electromagnetic Nonminimal Couplings in the Dirac Equation | Presented at the Seventh Meeting on CPT and Lorentz Symmetry,
Bloomington, Indiana, June 20-24, 2016 | null | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine a new class of CPT-even and dimension-five nonminimal interactions
between fermions and photons, deprived of higher-order derivatives, yielding
electric dipole moment and magnetic dipole moment in the context of the Dirac
equation. These couplings are Lorentz-violating nonminimal structures, composed
of a rank-2 tensor, the electromagnetic tensor, and gamma matrices, being
addressed in its axial and non-axial hermitian versions. We use the electron's
anomalous magnetic and electric dipole moment measurements to reach upper
bounds of $1$ part in $10^{11}$ and $10^{16}$ GeV$^{-1}$.
| [
{
"created": "Thu, 28 Jul 2016 17:51:00 GMT",
"version": "v1"
}
] | 2016-07-29 | [
[
"Araujo",
"J. B.",
""
],
[
"Casana",
"Rodolfo",
""
],
[
"Ferreira",
"M. M.",
"Jr"
]
] | We examine a new class of CPT-even and dimension-five nonminimal interactions between fermions and photons, deprived of higher-order derivatives, yielding electric dipole moment and magnetic dipole moment in the context of the Dirac equation. These couplings are Lorentz-violating nonminimal structures, composed of a rank-2 tensor, the electromagnetic tensor, and gamma matrices, being addressed in its axial and non-axial hermitian versions. We use the electron's anomalous magnetic and electric dipole moment measurements to reach upper bounds of $1$ part in $10^{11}$ and $10^{16}$ GeV$^{-1}$. |
1503.02463 | Ju-Jun Xie | Lian-Rong Dai, Ju-Jun Xie and E. Oset | Study of the $f_2(1270)$, $f'_2(1525)$, $\bar{K}^*_{2}(1430)$,
$f_0(1370)$ and $f_0(1710)$ production from $\psi (nS)$ and $\Upsilon (nS)$
decays | Published version | Phys. Rev. D 91, 094013 (2015) | 10.1103/PhysRevD.91.094013 | null | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Based on previous studies that support the important role of the $f_2(1270)$,
$f'_2(1525)$, and $\bar{K}^{*}_{2}(1430)$ resonances in the $J/\psi [\psi(2S)]
\to \phi (\omega) VV$ decays, we make an analysis of the analogous decays of
$\Upsilon (1S)$ and $\Upsilon (2S)$, taking into account recent experimental
data. In addition, we study the $J/\psi$ and $\psi(2S)$ radiative decays and we
also made predictions for the radiative decay of $\Upsilon(1S)$ and
$\Upsilon(2S)$ into $\gamma f_2(1270)$, $\gamma f'_2(1525)$, $\gamma f_0(1370)$
and $\gamma f_0(1710)$, comparing with the recent results of a CLEO experiment.
We can compare our results for ratios of decay rates with eight experimental
ratios and find agreement in all but one case, where experimental problems are
discussed.
| [
{
"created": "Mon, 9 Mar 2015 13:03:54 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Mar 2015 09:00:41 GMT",
"version": "v2"
},
{
"created": "Thu, 26 Nov 2015 00:35:18 GMT",
"version": "v3"
}
] | 2015-11-30 | [
[
"Dai",
"Lian-Rong",
""
],
[
"Xie",
"Ju-Jun",
""
],
[
"Oset",
"E.",
""
]
] | Based on previous studies that support the important role of the $f_2(1270)$, $f'_2(1525)$, and $\bar{K}^{*}_{2}(1430)$ resonances in the $J/\psi [\psi(2S)] \to \phi (\omega) VV$ decays, we make an analysis of the analogous decays of $\Upsilon (1S)$ and $\Upsilon (2S)$, taking into account recent experimental data. In addition, we study the $J/\psi$ and $\psi(2S)$ radiative decays and we also made predictions for the radiative decay of $\Upsilon(1S)$ and $\Upsilon(2S)$ into $\gamma f_2(1270)$, $\gamma f'_2(1525)$, $\gamma f_0(1370)$ and $\gamma f_0(1710)$, comparing with the recent results of a CLEO experiment. We can compare our results for ratios of decay rates with eight experimental ratios and find agreement in all but one case, where experimental problems are discussed. |
2201.11635 | Bin Yan | Hongxin Dong, Peng Sun, Bin Yan and C.-P. Yuan | Probing the $Zb\bar{b}$ anomalous couplings via exclusive $Z$ boson
decay | 7 pages, 4 figures, published in PLB | null | 10.1016/j.physletb.2022.137076 | LA-UR-22-20027, MSUHEP-22-001 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose to utilize the exclusive $Z$-boson rare decays $Z\to
\Upsilon(ns)+\gamma$ to constrain the $Zb\bar{b}$ couplings at the HL-LHC and
100 TeV proton-proton collider. We demonstrate that the event yield of the
proposed processes is sensitive to the axial-vector component of the
$Zb\bar{b}$ coupling and can provide complementary information to the
jet-charge weighted single-spin asymmetry measurement at the EIC and the $gg\to
Zh$ production rate measurement at the LHC. By applying the NRQCD factorization
formalism, we calculate the partial decay width of $Z\to \Upsilon(ns)+\gamma$
to the NLO accuracy in strong interaction, which is found to agree with those
obtained from the light-cone distribution amplitude approach. We show that the
HL-LHC can break the degeneracy of the $Zb\bar{b}$ couplings, as implied by the
precision electroweak data at LEP and SLC, if the signal efficiency can be
improved by a factor of 1.7 from the present ATLAS analysis at the 13 TeV LHC
with an integrated luminosity of $36.1~{\rm fb}^{-1}$.
| [
{
"created": "Thu, 27 Jan 2022 16:55:37 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Apr 2022 22:02:34 GMT",
"version": "v2"
}
] | 2022-04-20 | [
[
"Dong",
"Hongxin",
""
],
[
"Sun",
"Peng",
""
],
[
"Yan",
"Bin",
""
],
[
"Yuan",
"C. -P.",
""
]
] | We propose to utilize the exclusive $Z$-boson rare decays $Z\to \Upsilon(ns)+\gamma$ to constrain the $Zb\bar{b}$ couplings at the HL-LHC and 100 TeV proton-proton collider. We demonstrate that the event yield of the proposed processes is sensitive to the axial-vector component of the $Zb\bar{b}$ coupling and can provide complementary information to the jet-charge weighted single-spin asymmetry measurement at the EIC and the $gg\to Zh$ production rate measurement at the LHC. By applying the NRQCD factorization formalism, we calculate the partial decay width of $Z\to \Upsilon(ns)+\gamma$ to the NLO accuracy in strong interaction, which is found to agree with those obtained from the light-cone distribution amplitude approach. We show that the HL-LHC can break the degeneracy of the $Zb\bar{b}$ couplings, as implied by the precision electroweak data at LEP and SLC, if the signal efficiency can be improved by a factor of 1.7 from the present ATLAS analysis at the 13 TeV LHC with an integrated luminosity of $36.1~{\rm fb}^{-1}$. |
2203.08094 | Patrick Huber | Alex Bogacz, Vedran Brdar, Alan Bross, Andr\'e de Gouv\^ea,
Jean-Pierre Delahaye, Patrick Huber, Matheus Hostert, Kevin J. Kelly, Ken
Long, Mark Palmer, J. Pasternak, Chris Rogers, Zahra Tabrizi | The Physics Case for a Neutrino Factory | 32 pages, 4 figures. White paper contribution to Snowmass 2021 | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Neutrino factories, neutrino beams produced in the decay of a muon or
antimuon beam inside a storage ring, yield cleaner, richer, and more flexible
neutrino beams relative to super-beams. We explore the physics case for this
type of beam both for standard oscillation as well as new physics searches and
present some machine options. We argue that there is a rich program beyond what
the current neutrino program can cover and a string synergy with the muon
collider program.
| [
{
"created": "Tue, 15 Mar 2022 17:23:04 GMT",
"version": "v1"
}
] | 2022-03-16 | [
[
"Bogacz",
"Alex",
""
],
[
"Brdar",
"Vedran",
""
],
[
"Bross",
"Alan",
""
],
[
"de Gouvêa",
"André",
""
],
[
"Delahaye",
"Jean-Pierre",
""
],
[
"Huber",
"Patrick",
""
],
[
"Hostert",
"Matheus",
""
],
[
"Kelly",
"Kevin J.",
""
],
[
"Long",
"Ken",
""
],
[
"Palmer",
"Mark",
""
],
[
"Pasternak",
"J.",
""
],
[
"Rogers",
"Chris",
""
],
[
"Tabrizi",
"Zahra",
""
]
] | Neutrino factories, neutrino beams produced in the decay of a muon or antimuon beam inside a storage ring, yield cleaner, richer, and more flexible neutrino beams relative to super-beams. We explore the physics case for this type of beam both for standard oscillation as well as new physics searches and present some machine options. We argue that there is a rich program beyond what the current neutrino program can cover and a string synergy with the muon collider program. |
0710.5699 | Diego Aristizabal | D. Aristizabal Sierra, M. Hirsch, S. G. Kovalenko | Leptoquarks: Neutrino masses and accelerator phenomenology | 28 pages, 10 figures | Phys.Rev.D77:055011,2008 | 10.1103/PhysRevD.77.055011 | IFIC/07-68 | hep-ph | null | Leptoquark-Higgs interactions induce mixing between leptoquark states with
different chiralities once the electro-weak symmetry is broken. In such LQ
models Majorana neutrino masses are generated at 1-loop order. Here we
calculate the neutrino mass matrix and explore the constraints on the parameter
space enforced by the assumption that LQ-loops explain current neutrino
oscillation data. LQs will be produced at the LHC, if their masses are at or
below the TeV scale. Since the fermionic decays of LQs are governed by the same
Yukawa couplings, which are responsible for the non-trivial neutrino mass
matrix, several decay branching ratios of LQ states can be predicted from
measured neutrino data. Especially interesting is that large lepton flavour
violating rates in muon and tau final states are expected. In addition, the
model predicts that, if kinematically possible, heavier LQs decay into lighter
ones plus either a standard model Higgs boson or a $Z^0/W^{\pm}$ gauge boson.
Thus, experiments at the LHC might be able to exclude the LQ mechanism as
explanation of neutrino data.
| [
{
"created": "Tue, 30 Oct 2007 16:44:32 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Sierra",
"D. Aristizabal",
""
],
[
"Hirsch",
"M.",
""
],
[
"Kovalenko",
"S. G.",
""
]
] | Leptoquark-Higgs interactions induce mixing between leptoquark states with different chiralities once the electro-weak symmetry is broken. In such LQ models Majorana neutrino masses are generated at 1-loop order. Here we calculate the neutrino mass matrix and explore the constraints on the parameter space enforced by the assumption that LQ-loops explain current neutrino oscillation data. LQs will be produced at the LHC, if their masses are at or below the TeV scale. Since the fermionic decays of LQs are governed by the same Yukawa couplings, which are responsible for the non-trivial neutrino mass matrix, several decay branching ratios of LQ states can be predicted from measured neutrino data. Especially interesting is that large lepton flavour violating rates in muon and tau final states are expected. In addition, the model predicts that, if kinematically possible, heavier LQs decay into lighter ones plus either a standard model Higgs boson or a $Z^0/W^{\pm}$ gauge boson. Thus, experiments at the LHC might be able to exclude the LQ mechanism as explanation of neutrino data. |
2105.06688 | Stefano Frixione | Stefano Frixione | On factorisation schemes for the electron parton distribution functions
in QED | 32 pages; eq.(3.7) has been corrected, and the text relevant to it
amended | null | 10.1007/JHEP07(2021)180 | CERN-TH-2021-078 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The electron, positron, and photon Parton Distribution Functions (PDFs) of
the unpolarised electron have recently been computed at the next-to-leading
logarithmic accuracy in QED, by adopting the $\overline{\rm MS}$ factorisation
scheme. We present here analogous results, obtained by working in a different
framework that is inspired by the so-called DIS scheme. We derive analytical
solutions relevant to the large-$z$ region, where we show that the behaviour of
the PDFs depends in a dramatic way on whether running-$\alpha$ effects are
included to all orders, as opposed to being truncated to some fixed order. By
means of suitable initial and evolution conditions, next-to-leading logarithmic
accurate PDFs are obtained whose large-$z$ functional forms are identical to
those of their leading logarithmic counterparts.
| [
{
"created": "Fri, 14 May 2021 08:02:47 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Jul 2021 09:51:25 GMT",
"version": "v2"
},
{
"created": "Tue, 21 Dec 2021 17:04:00 GMT",
"version": "v3"
}
] | 2021-12-22 | [
[
"Frixione",
"Stefano",
""
]
] | The electron, positron, and photon Parton Distribution Functions (PDFs) of the unpolarised electron have recently been computed at the next-to-leading logarithmic accuracy in QED, by adopting the $\overline{\rm MS}$ factorisation scheme. We present here analogous results, obtained by working in a different framework that is inspired by the so-called DIS scheme. We derive analytical solutions relevant to the large-$z$ region, where we show that the behaviour of the PDFs depends in a dramatic way on whether running-$\alpha$ effects are included to all orders, as opposed to being truncated to some fixed order. By means of suitable initial and evolution conditions, next-to-leading logarithmic accurate PDFs are obtained whose large-$z$ functional forms are identical to those of their leading logarithmic counterparts. |
1101.4954 | Igor Shovkovy | E. V. Gorbar, V. A. Miransky, I. A. Shovkovy | Normal ground state of dense relativistic matter in a magnetic field | 28 pages, 6 figures; v2: title changed in journal | Phys.Rev.D83:085003,2011 | 10.1103/PhysRevD.83.085003 | UWO-TH-11/1 | hep-ph hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The properties of the ground state of relativistic matter in a magnetic field
are examined within the framework of a Nambu-Jona-Lasinio model. The main
emphasis of this study is the normal ground state, which is realized at
sufficiently high temperatures and/or sufficiently large chemical potentials.
In contrast to the vacuum state, which is characterized by the magnetic
catalysis of chiral symmetry breaking, the normal state is accompanied by the
dynamical generation of the chiral shift parameter $\Delta$. In the chiral
limit, the value of $\Delta$ determines a relative shift of the longitudinal
momenta (along the direction of the magnetic field) in the dispersion relations
of opposite chirality fermions. We argue that the chirality remains a good
approximate quantum number even for massive fermions in the vicinity of the
Fermi surface and, therefore, the chiral shift is expected to play an important
role in many types of cold dense relativistic matter, relevant for applications
in compact stars. The qualitative implications of the revealed structure of the
normal ground state on the physics of protoneutron stars are discussed. A
noticeable feature of the $\Delta$ parameter is that it is insensitive to
temperature when $T \ll \mu_0$, where $\mu_0$ is the chemical potential, and
{\it increases} with temperature for $T > \mu_0$. The latter implies that the
chiral shift parameter is also generated in the regime relevant for heavy ion
collisions.
| [
{
"created": "Tue, 25 Jan 2011 21:13:55 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Apr 2011 22:44:42 GMT",
"version": "v2"
}
] | 2015-03-18 | [
[
"Gorbar",
"E. V.",
""
],
[
"Miransky",
"V. A.",
""
],
[
"Shovkovy",
"I. A.",
""
]
] | The properties of the ground state of relativistic matter in a magnetic field are examined within the framework of a Nambu-Jona-Lasinio model. The main emphasis of this study is the normal ground state, which is realized at sufficiently high temperatures and/or sufficiently large chemical potentials. In contrast to the vacuum state, which is characterized by the magnetic catalysis of chiral symmetry breaking, the normal state is accompanied by the dynamical generation of the chiral shift parameter $\Delta$. In the chiral limit, the value of $\Delta$ determines a relative shift of the longitudinal momenta (along the direction of the magnetic field) in the dispersion relations of opposite chirality fermions. We argue that the chirality remains a good approximate quantum number even for massive fermions in the vicinity of the Fermi surface and, therefore, the chiral shift is expected to play an important role in many types of cold dense relativistic matter, relevant for applications in compact stars. The qualitative implications of the revealed structure of the normal ground state on the physics of protoneutron stars are discussed. A noticeable feature of the $\Delta$ parameter is that it is insensitive to temperature when $T \ll \mu_0$, where $\mu_0$ is the chemical potential, and {\it increases} with temperature for $T > \mu_0$. The latter implies that the chiral shift parameter is also generated in the regime relevant for heavy ion collisions. |
hep-ph/0107251 | Daniel Gomez Dumm | D. Gomez Dumm, N. N. Scoccola | Chiral quark models with non-local separable interactions at finite
temperature and chemical potential | 14 pages incl. 11 eps figures. New figures and related comments
added. To be published in Phys Rev D | Phys.Rev. D65 (2002) 074021 | 10.1103/PhysRevD.65.074021 | null | hep-ph | null | Chiral quark models with non-local covariant separable interactions at finite
temperature and chemical potential are investigated. We develop a formalism in
which the different quark properties are evaluated taking into account the
analytic structure of the quark propagator. In this framework we study the
chiral restoration phase transition for several definite non-local regulators,
including that arising within the instanton liquid picture. We find that in all
cases the chiral transition is of first order for low values of T, turning into
a smooth crossover at a certain "end point". Using model parameters which lead
to the physical pion mass and decay constant, we find for the position of this
"end point" the values (T_E, mu_E) approx. (60-70, 180-210) MeV. We also
discuss the special relevance of the first poles of the quark propagator.
| [
{
"created": "Tue, 24 Jul 2001 19:12:32 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Jan 2002 14:52:51 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Dumm",
"D. Gomez",
""
],
[
"Scoccola",
"N. N.",
""
]
] | Chiral quark models with non-local covariant separable interactions at finite temperature and chemical potential are investigated. We develop a formalism in which the different quark properties are evaluated taking into account the analytic structure of the quark propagator. In this framework we study the chiral restoration phase transition for several definite non-local regulators, including that arising within the instanton liquid picture. We find that in all cases the chiral transition is of first order for low values of T, turning into a smooth crossover at a certain "end point". Using model parameters which lead to the physical pion mass and decay constant, we find for the position of this "end point" the values (T_E, mu_E) approx. (60-70, 180-210) MeV. We also discuss the special relevance of the first poles of the quark propagator. |
0811.0998 | Andre Utermann | Daniel Boer, Andre Utermann, Erik Wessels | The saturation scale and its x-dependence from Lambda polarization
studies | 11 pages, 6 figures | Phys.Lett.B671:91-98,2009 | 10.1016/j.physletb.2008.12.004 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The transverse polarization of forward Lambda hyperons produced in
high-energy p-A collisions is expected to display an extremum at a transverse
momentum around the saturation scale. This was first observed within the
context of the McLerran-Venugopalan model which has an x-independent saturation
scale. The extremum arises due to the k_t-odd nature of the polarization
dependent fragmentation function, which probes approximately the derivative of
the dipole scattering amplitude. The amplitude changes most strongly around the
saturation scale, resulting in a peak in the polarization. We find that the
observation also extends to the more realistic case in which the saturation
scale Q_s is x dependent. Since a range of x and therefore Q_s values is probed
at a given transverse momentum and rapidity, this result is a priori not
expected. Moreover, the measurement of Lambda polarization over a range of x_F
values actually provides a direct probe of the x dependence of the saturation
scale. This novel feature is demonstrated for typical LHC kinematics and for
several phenomenological models of the dipole scattering amplitude. We show
that although the measurement will be challenging, it may be feasible at LHC.
The situation at RHIC is not favorable, because the peak will likely be at too
low transverse momentum of the Lambda to be a trustworthy measure of the
saturation scale.
| [
{
"created": "Thu, 6 Nov 2008 17:27:00 GMT",
"version": "v1"
}
] | 2009-01-30 | [
[
"Boer",
"Daniel",
""
],
[
"Utermann",
"Andre",
""
],
[
"Wessels",
"Erik",
""
]
] | The transverse polarization of forward Lambda hyperons produced in high-energy p-A collisions is expected to display an extremum at a transverse momentum around the saturation scale. This was first observed within the context of the McLerran-Venugopalan model which has an x-independent saturation scale. The extremum arises due to the k_t-odd nature of the polarization dependent fragmentation function, which probes approximately the derivative of the dipole scattering amplitude. The amplitude changes most strongly around the saturation scale, resulting in a peak in the polarization. We find that the observation also extends to the more realistic case in which the saturation scale Q_s is x dependent. Since a range of x and therefore Q_s values is probed at a given transverse momentum and rapidity, this result is a priori not expected. Moreover, the measurement of Lambda polarization over a range of x_F values actually provides a direct probe of the x dependence of the saturation scale. This novel feature is demonstrated for typical LHC kinematics and for several phenomenological models of the dipole scattering amplitude. We show that although the measurement will be challenging, it may be feasible at LHC. The situation at RHIC is not favorable, because the peak will likely be at too low transverse momentum of the Lambda to be a trustworthy measure of the saturation scale. |
1912.01633 | Xiaojun Yao | Xiaojun Yao, Weiyao Ke, Yingru Xu, Steffen Bass, Thomas Mehen and
Berndt M\"uller | Fate of Heavy Quark Bound States inside Quark-Gluon Plasma | 6 pages, 1 figure; contribution to proceedings for the 18th
International Conference on Hadron Spectroscopy and Structure (Hadron 2019) | Hadron Spectroscopy and Structure, World Scientific, August 2020
(doi.org/10.1142/11798) | 10.1142/9789811219313_0118 | MIT-CTP-5161 | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Transport equations have been applied successfully to describe the quarkonium
evolution inside the quark-gluon plasma, which include both plasma screening
effects and recombination. We demonstrate how the quarkonium transport equation
is derived from QCD by using the open quantum system framework and effective
field theory. Weak coupling and Markovian approximations used in the derivation
are justified from a separation of scales. By solving the equations
numerically, we study the Upsilon production in heavy ion collisions.
| [
{
"created": "Tue, 3 Dec 2019 19:08:54 GMT",
"version": "v1"
}
] | 2020-09-03 | [
[
"Yao",
"Xiaojun",
""
],
[
"Ke",
"Weiyao",
""
],
[
"Xu",
"Yingru",
""
],
[
"Bass",
"Steffen",
""
],
[
"Mehen",
"Thomas",
""
],
[
"Müller",
"Berndt",
""
]
] | Transport equations have been applied successfully to describe the quarkonium evolution inside the quark-gluon plasma, which include both plasma screening effects and recombination. We demonstrate how the quarkonium transport equation is derived from QCD by using the open quantum system framework and effective field theory. Weak coupling and Markovian approximations used in the derivation are justified from a separation of scales. By solving the equations numerically, we study the Upsilon production in heavy ion collisions. |
1205.1466 | Jan Winter | Peter Z. Skands, Bryan R. Webber, Jan Winter | QCD Coherence and the Top Quark Asymmetry | 28 pages, 11 figures, 2 tables | JHEP 1207 (2012) 151 | 10.1007/JHEP07(2012)151 | Cavendish-HEP-12/07; CERN-PH-TH/2012-099; MCNET-12-04 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Coherent QCD radiation in the hadroproduction of top quark pairs leads to a
forward--backward asymmetry that grows more negative with increasing transverse
momentum of the pair. This feature is present in Monte Carlo event generators
with coherent parton showering, even though the production process is treated
at leading order and has no intrinsic asymmetry before showering. In addition,
depending on the treatment of recoils, showering can produce a positive
contribution to the inclusive asymmetry. We explain the origin of these
features, compare them in fixed-order calculations and the Herwig++, Pythia and
Sherpa event generators, and discuss their implications.
| [
{
"created": "Mon, 7 May 2012 17:37:34 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Sep 2012 22:35:15 GMT",
"version": "v2"
}
] | 2012-09-24 | [
[
"Skands",
"Peter Z.",
""
],
[
"Webber",
"Bryan R.",
""
],
[
"Winter",
"Jan",
""
]
] | Coherent QCD radiation in the hadroproduction of top quark pairs leads to a forward--backward asymmetry that grows more negative with increasing transverse momentum of the pair. This feature is present in Monte Carlo event generators with coherent parton showering, even though the production process is treated at leading order and has no intrinsic asymmetry before showering. In addition, depending on the treatment of recoils, showering can produce a positive contribution to the inclusive asymmetry. We explain the origin of these features, compare them in fixed-order calculations and the Herwig++, Pythia and Sherpa event generators, and discuss their implications. |
2310.12273 | Mohamed Krab | A. Arhrib, R. Benbrik, M. Krab, B. Manaut, S. Moretti, Y. Wang and Q.
S. Yan | Probing a light charged Higgs boson at the LHC Run 3 | 6 pages, 4 tables, contribution to the proceedings of the EPS-HEP2023
conference | PoS(EPS-HEP2023)417 | 10.22323/1.449.0417 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the Large Hadron Collider (LHC) discovery prospects of a light
charged Higgs boson decaying into a $W$ boson and a non-Standard Model
(SM)-like Higgs within the 2-Higgs Doublet Model type-I. In the analysis, we
consider the associated production of a charged Higgs boson with a light
neutral one, $pp \rightarrow H^{\pm} h$, with the subsequent $H^\pm \rightarrow
W^{\pm*} h$. We then investigate the emerging $W^{\pm*} + 4b$ final state and
provide several benchmark points for signal-to-background analysis. We
therefore show that this signal could be an excellent avenue for identifying
$H^\pm$ at the LHC.
| [
{
"created": "Wed, 18 Oct 2023 19:12:59 GMT",
"version": "v1"
}
] | 2024-02-13 | [
[
"Arhrib",
"A.",
""
],
[
"Benbrik",
"R.",
""
],
[
"Krab",
"M.",
""
],
[
"Manaut",
"B.",
""
],
[
"Moretti",
"S.",
""
],
[
"Wang",
"Y.",
""
],
[
"Yan",
"Q. S.",
""
]
] | We study the Large Hadron Collider (LHC) discovery prospects of a light charged Higgs boson decaying into a $W$ boson and a non-Standard Model (SM)-like Higgs within the 2-Higgs Doublet Model type-I. In the analysis, we consider the associated production of a charged Higgs boson with a light neutral one, $pp \rightarrow H^{\pm} h$, with the subsequent $H^\pm \rightarrow W^{\pm*} h$. We then investigate the emerging $W^{\pm*} + 4b$ final state and provide several benchmark points for signal-to-background analysis. We therefore show that this signal could be an excellent avenue for identifying $H^\pm$ at the LHC. |
hep-ph/0011309 | Gonzalo Parente Bermudez | J.A. Castro Pena, G. Parente and E. Zas (Universidade de Santiago de
Compostela) | Nuclear Effects on the UHE Neutrino-Nucleon Deep Inelastic Scattering
Cross Section | 7 pages, Latex, figures as 3 postscript files | Phys.Lett. B507 (2001) 231-235 | 10.1016/S0370-2693(01)00418-X | US-FT/10-00 | hep-ph | null | Using a recent parametrization of nuclear effects in parton distribution
functions we calculate the neutrino-nucleon cross section at energies relevant
for ultra high energy neutrino telescopes. The modification of the cross
section in comparison with the calculation using parton densities in free
nucleons is of the order of few per cent for the parameter range of interest in
neutrino telescopes (A=10 and E=10$^6$ GeV) and it reaches 20 % at the highest
energies (E=10$^{12}$ GeV) and for the largest nuclear size (A=190) considered.
| [
{
"created": "Fri, 24 Nov 2000 19:26:30 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Pena",
"J. A. Castro",
"",
"Universidade de Santiago de\n Compostela"
],
[
"Parente",
"G.",
"",
"Universidade de Santiago de\n Compostela"
],
[
"Zas",
"E.",
"",
"Universidade de Santiago de\n Compostela"
]
] | Using a recent parametrization of nuclear effects in parton distribution functions we calculate the neutrino-nucleon cross section at energies relevant for ultra high energy neutrino telescopes. The modification of the cross section in comparison with the calculation using parton densities in free nucleons is of the order of few per cent for the parameter range of interest in neutrino telescopes (A=10 and E=10$^6$ GeV) and it reaches 20 % at the highest energies (E=10$^{12}$ GeV) and for the largest nuclear size (A=190) considered. |
hep-ph/0612331 | Gilbert Moultaka | Gilbert Moultaka | Very Light Gravitino Dark Matter | 8 pages, 2 figures, presented at 'Physics at LHC', Cracow, Poland,
3-8 July `06 | ActaPhys.Polon.B38:645-652,2007 | null | LPTA/06-57 | hep-ph | null | We address the question of dark matter in the context of gauge mediated
supersymmetry breaking models. In contrast with mSUGRA scenarios, the messenger
of the susy breaking to the visible sector can play an important role allowing
a relic gravitino in the $\sim {keV}$ to $10 {MeV}$ mass range to account for
the cold dark matter in the Universe.
| [
{
"created": "Tue, 26 Dec 2006 17:05:11 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Moultaka",
"Gilbert",
""
]
] | We address the question of dark matter in the context of gauge mediated supersymmetry breaking models. In contrast with mSUGRA scenarios, the messenger of the susy breaking to the visible sector can play an important role allowing a relic gravitino in the $\sim {keV}$ to $10 {MeV}$ mass range to account for the cold dark matter in the Universe. |
1507.06312 | Doojin Kim | Doojin Kim, Kyoungchul Kong, Hyun Min Lee, Seong Chan Park | Diboson Excesses Demystified in Effective Field Theory Approach | 22 pages, 6 figures, main text slightly modified with results
unchanged | null | null | CETUP2015-013 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the collider implication of a neutral resonance which decays to
several diboson final states such as $W^+W^-$, $ZZ$, and $Z\gamma$ via a
minimal set of effective operators. We consider both CP-even and CP-odd bosonic
states with spin 0, 1, or 2. The production cross sections for the bosonic
resonance states are obtained with the effective operators involving gluons
(and quarks), and the branching fractions are obtained with the operators
responsible for the interactions with electroweak gauge bosons. We demonstrate
that each scenario allows for a broad parameter space which could accommodate
the recently-reported intriguing excesses in the ATLAS diboson final states,
and discuss how the CP states and spin information of the resonance can be
extracted at the LHC run II.
| [
{
"created": "Wed, 22 Jul 2015 20:00:36 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Aug 2015 19:26:15 GMT",
"version": "v2"
}
] | 2015-08-27 | [
[
"Kim",
"Doojin",
""
],
[
"Kong",
"Kyoungchul",
""
],
[
"Lee",
"Hyun Min",
""
],
[
"Park",
"Seong Chan",
""
]
] | We study the collider implication of a neutral resonance which decays to several diboson final states such as $W^+W^-$, $ZZ$, and $Z\gamma$ via a minimal set of effective operators. We consider both CP-even and CP-odd bosonic states with spin 0, 1, or 2. The production cross sections for the bosonic resonance states are obtained with the effective operators involving gluons (and quarks), and the branching fractions are obtained with the operators responsible for the interactions with electroweak gauge bosons. We demonstrate that each scenario allows for a broad parameter space which could accommodate the recently-reported intriguing excesses in the ATLAS diboson final states, and discuss how the CP states and spin information of the resonance can be extracted at the LHC run II. |
hep-ph/9409388 | Mihaela Buza | S. Bauberger, F. A. Berends, M. Boehm, M. Buza | Analytical and numerical methods for massive two-loop self-energy
diagrams | 24 pages | Nucl.Phys.B434:383-407,1995 | 10.1016/0550-3213(94)00475-T | INLO-PUB - 9/94,UWITP - 2/94 | hep-ph | null | Motivated by the precision results in the electroweak theory studies of
two-loopFeynman diagrams are performed. Specifically this paper gives a
contribution to the knowledge of massive two-loop self-energy diagrams in
arbitrary and especially four dimensions.This is done in three respects firstly
results in terms of generalized, multivariable hypergeometric functions are
presented giving explicit series for small and large momenta. Secondly the
imaginary parts of these integrals are expressed as complete elliptic
integrals.Finally one-dimensional integral representations with elementary
functions are derived.They are very well suited for the numerical evaluations.
| [
{
"created": "Thu, 22 Sep 1994 12:24:45 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Oct 1994 14:25:28 GMT",
"version": "v2"
}
] | 2011-09-30 | [
[
"Bauberger",
"S.",
""
],
[
"Berends",
"F. A.",
""
],
[
"Boehm",
"M.",
""
],
[
"Buza",
"M.",
""
]
] | Motivated by the precision results in the electroweak theory studies of two-loopFeynman diagrams are performed. Specifically this paper gives a contribution to the knowledge of massive two-loop self-energy diagrams in arbitrary and especially four dimensions.This is done in three respects firstly results in terms of generalized, multivariable hypergeometric functions are presented giving explicit series for small and large momenta. Secondly the imaginary parts of these integrals are expressed as complete elliptic integrals.Finally one-dimensional integral representations with elementary functions are derived.They are very well suited for the numerical evaluations. |
2203.06160 | Jeremy Sakstein | Jeremy Sakstein, Djuna Croon, Samuel D. McDermott | Axion Instability Supernovae | 11 pages, 4 figures. Reproduction package available here:
https://zenodo.org/record/6347632 | Phys. Rev. D 105, 095038 (2022) | 10.1103/PhysRevD.105.095038 | IPPP/22/10, FERMILAB-PUB-22-118-T | hep-ph astro-ph.CO astro-ph.HE astro-ph.SR gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | New particles coupled to the Standard Model can equilibrate in stellar cores
if they are sufficiently heavy and strongly coupled. In this work, we
investigate the astrophysical consequences of such a scenario for massive stars
by incorporating new contributions to the equation of state into a state of the
art stellar structure code. We focus on axions in the "cosmological triangle",
a region of parameter space with $300{\rm\,keV} \lesssim m_a \lesssim 2$ MeV,
$g_{a\gamma\gamma}\sim 10^{-5}$ GeV$^{-1}$ that is not presently excluded by
other considerations. We find that for axion masses $m_a \sim m_e $, axion
production in the core drives a new stellar instability that results in
explosive nuclear burning that either drives a series of mass-shedding
pulsations or completely disrupts the star resulting in a new type of optical
transient -- an \textit{Axion Instability Supernova}. We predict that the upper
black hole mass gap would be located at $37{\rm M}_\odot \le M\le 107{\rm
M}_\odot$ in these theories, a large shift down from the standard prediction,
which is disfavored by the detection of the mass gap in the LIGO/Virgo/KAGRA
GWTC-2 gravitational wave catalog beginning at $46_{-6}^{+17}{\rm M}_\odot$.
Furthermore, axion-instability supernovae are more common than pair-instability
supernovae, making them excellent candidate targets for JWST. The methods
presented in this work can be used to investigate the astrophysical
consequences of any theory of new physics that contains heavy bosonic particles
of arbitrary spin. We provide the tools to facilitate such studies.
| [
{
"created": "Fri, 11 Mar 2022 18:37:47 GMT",
"version": "v1"
},
{
"created": "Wed, 25 May 2022 18:57:09 GMT",
"version": "v2"
}
] | 2022-05-27 | [
[
"Sakstein",
"Jeremy",
""
],
[
"Croon",
"Djuna",
""
],
[
"McDermott",
"Samuel D.",
""
]
] | New particles coupled to the Standard Model can equilibrate in stellar cores if they are sufficiently heavy and strongly coupled. In this work, we investigate the astrophysical consequences of such a scenario for massive stars by incorporating new contributions to the equation of state into a state of the art stellar structure code. We focus on axions in the "cosmological triangle", a region of parameter space with $300{\rm\,keV} \lesssim m_a \lesssim 2$ MeV, $g_{a\gamma\gamma}\sim 10^{-5}$ GeV$^{-1}$ that is not presently excluded by other considerations. We find that for axion masses $m_a \sim m_e $, axion production in the core drives a new stellar instability that results in explosive nuclear burning that either drives a series of mass-shedding pulsations or completely disrupts the star resulting in a new type of optical transient -- an \textit{Axion Instability Supernova}. We predict that the upper black hole mass gap would be located at $37{\rm M}_\odot \le M\le 107{\rm M}_\odot$ in these theories, a large shift down from the standard prediction, which is disfavored by the detection of the mass gap in the LIGO/Virgo/KAGRA GWTC-2 gravitational wave catalog beginning at $46_{-6}^{+17}{\rm M}_\odot$. Furthermore, axion-instability supernovae are more common than pair-instability supernovae, making them excellent candidate targets for JWST. The methods presented in this work can be used to investigate the astrophysical consequences of any theory of new physics that contains heavy bosonic particles of arbitrary spin. We provide the tools to facilitate such studies. |
1610.02272 | Alan D. Martin | S.P. Jones, A.D. Martin, M.G. Ryskin and T. Teubner | The exclusive $J/\psi$ process at the LHC tamed to probe the low $x$
gluon | 14 pages, 5 figures. Final paragraph of Sect. 3.2 added. Version to
be published in EPJC | null | 10.1140/epjc/s10052-016-4493-y | MPP-2016-303, IPPP/16/87, LTH 1102 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The perturbative QCD expansion for $J/\psi$ photoproduction appears to be
unstable: the NLO correction is large (and of opposite sign) to the LO
contribution. Moreover, the predictions are very sensitive to the choice of
factorization and renormalization scales. Here we show that perturbative
stability is greatly improved by imposing a $`Q_0$ cut' on the NLO coefficient
functions; a cut which is required to avoid double counting. $Q_0$ is the input
scale used in the parton DGLAP evolution. This result opens the possibility of
high precision exclusive $J/\psi$ data in the forward direction at the LHC
being able to determine the low $x$ gluon distribution at low scales.
| [
{
"created": "Fri, 7 Oct 2016 13:23:03 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Nov 2016 15:12:32 GMT",
"version": "v2"
}
] | 2016-12-21 | [
[
"Jones",
"S. P.",
""
],
[
"Martin",
"A. D.",
""
],
[
"Ryskin",
"M. G.",
""
],
[
"Teubner",
"T.",
""
]
] | The perturbative QCD expansion for $J/\psi$ photoproduction appears to be unstable: the NLO correction is large (and of opposite sign) to the LO contribution. Moreover, the predictions are very sensitive to the choice of factorization and renormalization scales. Here we show that perturbative stability is greatly improved by imposing a $`Q_0$ cut' on the NLO coefficient functions; a cut which is required to avoid double counting. $Q_0$ is the input scale used in the parton DGLAP evolution. This result opens the possibility of high precision exclusive $J/\psi$ data in the forward direction at the LHC being able to determine the low $x$ gluon distribution at low scales. |
1002.4747 | Bo-Qiang Ma | Lijing Shao, Yong-Jun Zhang, Bo-Qiang Ma | Sea quark contents of octet baryons | 15 pages, 2 figures, version in final publication | Phys.Lett.B686:136-140,2010 | 10.1016/j.physletb.2010.02.049 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The flavor asymmetry of the nucleon sea, i.e., the excess of $d\bar{d}$
quark-antiquark pairs over $u\bar{u}$ ones in the proton can be explained by
several different models; therefore, it is a challenge to discriminate these
models from each other. We examine in this Letter three models: the balance
model, the meson cloud model, and the chiral quark model, and we show that
these models give quite different predictions on the sea quark contents of
other octet baryons. New experiments aimed at measuring the flavor contents of
other octet baryons are needed for a more profound understanding of the
non-perturbative properties of quantum chromodynamics (QCD).
| [
{
"created": "Thu, 25 Feb 2010 15:30:42 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Feb 2010 02:04:57 GMT",
"version": "v2"
},
{
"created": "Sat, 27 Feb 2010 17:19:24 GMT",
"version": "v3"
}
] | 2010-06-17 | [
[
"Shao",
"Lijing",
""
],
[
"Zhang",
"Yong-Jun",
""
],
[
"Ma",
"Bo-Qiang",
""
]
] | The flavor asymmetry of the nucleon sea, i.e., the excess of $d\bar{d}$ quark-antiquark pairs over $u\bar{u}$ ones in the proton can be explained by several different models; therefore, it is a challenge to discriminate these models from each other. We examine in this Letter three models: the balance model, the meson cloud model, and the chiral quark model, and we show that these models give quite different predictions on the sea quark contents of other octet baryons. New experiments aimed at measuring the flavor contents of other octet baryons are needed for a more profound understanding of the non-perturbative properties of quantum chromodynamics (QCD). |
1812.11289 | Morimitsu Tanimoto | P.P. Novichkov, S.T. Petcov, and M. Tanimoto | Trimaximal Neutrino Mixing from Modular A4 Invariance with Residual
Symmetries | Figure is replaced. Discussions and References are added | null | 10.1016/j.physletb.2019.04.043 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct phenomenologically viable models of lepton masses and mixing
based on modular $A_4$ invariance broken to residual symmetries
$\mathbb{Z}^{T}_3$ or $\mathbb{Z}^{ST}_3$ and $\mathbb{Z}^S_2$ respectively in
the charged lepton and neutrino sectors. In these models the neutrino mixing
matrix is of trimaximal mixing form. In addition to successfully describing the
charged lepton masses, neutrino mass-squared differences and the atmospheric
and reactor neutrino mixing angles $\theta_{23}$ and $\theta_{13}$, these
models predict the values of the lightest neutrino mass (i.e., the absolute
neutrino mass scale), of the Dirac and Majorana CP violation(CPV) phases, as
well as the existence of specific correlations between i) the values of the
solar neutrino mixing angle $\theta_{12}$ and the angle $\theta_{13}$ (which
determines $\theta_{12}$), ii) the values of the Dirac CPV phase $\delta$ and
of the angles $\theta_{23}$ and $\theta_{13}$, iii) the sum of the neutrino
masses and $\theta_{23}$, and iv) between the two Majorana phases.
| [
{
"created": "Sat, 29 Dec 2018 05:35:47 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Apr 2019 00:14:40 GMT",
"version": "v2"
}
] | 2019-05-22 | [
[
"Novichkov",
"P. P.",
""
],
[
"Petcov",
"S. T.",
""
],
[
"Tanimoto",
"M.",
""
]
] | We construct phenomenologically viable models of lepton masses and mixing based on modular $A_4$ invariance broken to residual symmetries $\mathbb{Z}^{T}_3$ or $\mathbb{Z}^{ST}_3$ and $\mathbb{Z}^S_2$ respectively in the charged lepton and neutrino sectors. In these models the neutrino mixing matrix is of trimaximal mixing form. In addition to successfully describing the charged lepton masses, neutrino mass-squared differences and the atmospheric and reactor neutrino mixing angles $\theta_{23}$ and $\theta_{13}$, these models predict the values of the lightest neutrino mass (i.e., the absolute neutrino mass scale), of the Dirac and Majorana CP violation(CPV) phases, as well as the existence of specific correlations between i) the values of the solar neutrino mixing angle $\theta_{12}$ and the angle $\theta_{13}$ (which determines $\theta_{12}$), ii) the values of the Dirac CPV phase $\delta$ and of the angles $\theta_{23}$ and $\theta_{13}$, iii) the sum of the neutrino masses and $\theta_{23}$, and iv) between the two Majorana phases. |
hep-ph/9604437 | Dmitry Y. Ivanov | I.F. Ginzburg and D.Yu. Ivanov (Inst. of Math., Novosibisk) | The $Q^2$ dependence of the hard diffractive photoproduction of vector
meson or photon and the range of pQCD validity | ReVTeX, 36 pages, 5 Postscript figures, uses epsf.sty | Phys.Rev. D54 (1996) 5523-5535 | 10.1103/PhysRevD.54.5523 | null | hep-ph | null | We consider two coupled problems.
We study the dependence on photon virtuality $Q^2$ for the semihard
quasi--elastic photoproduction of neutral vector mesons on a quark, gluon or
real photon (at $s\gg p_{\bot}^2,\;Q^2; \; p_{\bot}^2\gg \mu^2 \approx (0.3$
GeV)$^2$). To this end we calculate the corresponding amplitudes (in an
analytical form) in the lowest nontrivial approximation of perturbative QCD. It
is shown that the amplitude for the production of light meson varies very
rapidly with the photon virtuality near $Q^2=0$.
We estimate the bound of the pQCD validity region for such processes. For the
real incident photon the obtained bound for the $\rho$ meson production is very
high. This bound decreases fast with the increase of $Q^2$, and we expect that
the virtual photoproduction at HERA gives opportunity to test the pQCD results.
The signature of this region is discussed. For the hard Compton effect the pQCD
should work good at not too high $p_{\bot}$, and this effect seems measurable
at HERA.
| [
{
"created": "Tue, 30 Apr 1996 14:16:32 GMT",
"version": "v1"
}
] | 2016-09-01 | [
[
"Ginzburg",
"I. F.",
"",
"Inst. of Math., Novosibisk"
],
[
"Ivanov",
"D. Yu.",
"",
"Inst. of Math., Novosibisk"
]
] | We consider two coupled problems. We study the dependence on photon virtuality $Q^2$ for the semihard quasi--elastic photoproduction of neutral vector mesons on a quark, gluon or real photon (at $s\gg p_{\bot}^2,\;Q^2; \; p_{\bot}^2\gg \mu^2 \approx (0.3$ GeV)$^2$). To this end we calculate the corresponding amplitudes (in an analytical form) in the lowest nontrivial approximation of perturbative QCD. It is shown that the amplitude for the production of light meson varies very rapidly with the photon virtuality near $Q^2=0$. We estimate the bound of the pQCD validity region for such processes. For the real incident photon the obtained bound for the $\rho$ meson production is very high. This bound decreases fast with the increase of $Q^2$, and we expect that the virtual photoproduction at HERA gives opportunity to test the pQCD results. The signature of this region is discussed. For the hard Compton effect the pQCD should work good at not too high $p_{\bot}$, and this effect seems measurable at HERA. |
hep-ph/9907369 | Chen Jisheng | Chen Jisheng, Zheng Xiaoping and Li Jiarong | The Nonlinear Permittivity Including Non-Abelian Self-interaction of
Plasmons in Quark-Gluon Plasma | 7 pages, shortened version accepted by Chin.Phys.Lett | Chin.Phys.Lett. 17 (2000) 714-716 | 10.1088/0256-307X/17/10/005 | HZPP-9908 | hep-ph | null | By decomposing the distribution functions and color field to regular and
fluctuation parts, the solution of the semi-classical kinetic equations of
quark-gluon plasma is analyzed. Through expanding the kinetic equations of the
fluctuation parts to third order, the nonlinear permittivity including the
self-interaction of gauge field is obtained and a rough numerical estimate is
given out for the important $\vk =0$ modes of the pure gluon plasma.
| [
{
"created": "Thu, 15 Jul 1999 04:07:40 GMT",
"version": "v1"
},
{
"created": "Sat, 14 Aug 1999 04:06:20 GMT",
"version": "v2"
},
{
"created": "Sat, 30 Sep 2000 07:49:53 GMT",
"version": "v3"
}
] | 2015-06-25 | [
[
"Jisheng",
"Chen",
""
],
[
"Xiaoping",
"Zheng",
""
],
[
"Jiarong",
"Li",
""
]
] | By decomposing the distribution functions and color field to regular and fluctuation parts, the solution of the semi-classical kinetic equations of quark-gluon plasma is analyzed. Through expanding the kinetic equations of the fluctuation parts to third order, the nonlinear permittivity including the self-interaction of gauge field is obtained and a rough numerical estimate is given out for the important $\vk =0$ modes of the pure gluon plasma. |
hep-ph/0101305 | Antonio Vairo | N. Brambilla, Y. Sumino and A. Vairo | Quarkonium Spectroscopy and Perturbative QCD: A New Perspective | 12 pages, 2 figures; Discussion on ultra-soft effects included; Some
conservative error estimates added; Version to appear in Phys.Lett.B | Phys.Lett.B513:381-390,2001 | 10.1016/S0370-2693(01)00611-6 | TU-607, IFUM-677-FT | hep-ph | null | We study the energy spectrum of bottomonium in perturbative QCD, taking
alpha_s(Mz)=0.1181 +/- 0.0020 as input and fixing m_b^{MSbar}(m_b^{MSbar}) on
the Upsilon(1S) mass. Contrary to wide beliefs, perturbative QCD reproduces
reasonably well the gross structure of the spectrum as long as the coupling
constant remains smaller than one. We perform a detailed analysis and discuss
the size of non-perturbative effects. A new qualitative picture on the
structure of the bottomonium spectrum is provided. The lowest-lying (c,cbar)
and (b,cbar) states are also examined.
| [
{
"created": "Sat, 27 Jan 2001 10:56:12 GMT",
"version": "v1"
},
{
"created": "Mon, 7 May 2001 13:33:32 GMT",
"version": "v2"
}
] | 2009-06-12 | [
[
"Brambilla",
"N.",
""
],
[
"Sumino",
"Y.",
""
],
[
"Vairo",
"A.",
""
]
] | We study the energy spectrum of bottomonium in perturbative QCD, taking alpha_s(Mz)=0.1181 +/- 0.0020 as input and fixing m_b^{MSbar}(m_b^{MSbar}) on the Upsilon(1S) mass. Contrary to wide beliefs, perturbative QCD reproduces reasonably well the gross structure of the spectrum as long as the coupling constant remains smaller than one. We perform a detailed analysis and discuss the size of non-perturbative effects. A new qualitative picture on the structure of the bottomonium spectrum is provided. The lowest-lying (c,cbar) and (b,cbar) states are also examined. |
1510.04575 | Shinya Matsuzaki | Shinya Matsuzaki | One-Family Walking Technicolor in Light of LHC Run-II | latex, 15 pages, contribution to Sakata Memorial KMI Workshop on
"Origin of Mass and Strong Coupling Gauge Theories (SCGT15)", 3-6 March 2015,
Nagoya University; some comments and references added | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The LHC Higgs can be identified as the technidilaton, a composite scalar,
arising as a pseudo Nambu-Goldstone boson for the spontaneous breaking of scale
symmetry in walking technicolor. One interesting candidate for the walking
technicolor is the QCD with the large number of fermion flavors, involving the
one-family model having the eight-fermion flavors. The smallness of the
technidilaton mass can be ensured by the generic walking feature, Miransky
scaling, and the presence of the "anti-Veneziano limit" characteristic to the
large-flavor walking scenario. To tell the standard-model Higgs from the
technidilaton, one needs to wait for the precise estimate of the Higgs
couplings to the standard model particles, which is expected at the ongoing
LHC-Run II. In this talk the technidilaton phenomenology in comparison with the
LHC Run-I data is summarized with the special emphasis placed on the presence
of the anti-Veneziano limit supporting the lightness of technidilaton. Besides
the technidilaton, the walking technicolor predicts the rich particle spectrum
such as technipions and technirho mesons, arising as composite particles formed
by technifermions. The LHC phenomenology of those technihadrons and the
discovery channels are also discussed, which are smoking-guns of the walking
technicolor, to be accessible at the LHC-Run II.
| [
{
"created": "Thu, 15 Oct 2015 15:14:18 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Oct 2015 10:12:12 GMT",
"version": "v2"
}
] | 2015-10-26 | [
[
"Matsuzaki",
"Shinya",
""
]
] | The LHC Higgs can be identified as the technidilaton, a composite scalar, arising as a pseudo Nambu-Goldstone boson for the spontaneous breaking of scale symmetry in walking technicolor. One interesting candidate for the walking technicolor is the QCD with the large number of fermion flavors, involving the one-family model having the eight-fermion flavors. The smallness of the technidilaton mass can be ensured by the generic walking feature, Miransky scaling, and the presence of the "anti-Veneziano limit" characteristic to the large-flavor walking scenario. To tell the standard-model Higgs from the technidilaton, one needs to wait for the precise estimate of the Higgs couplings to the standard model particles, which is expected at the ongoing LHC-Run II. In this talk the technidilaton phenomenology in comparison with the LHC Run-I data is summarized with the special emphasis placed on the presence of the anti-Veneziano limit supporting the lightness of technidilaton. Besides the technidilaton, the walking technicolor predicts the rich particle spectrum such as technipions and technirho mesons, arising as composite particles formed by technifermions. The LHC phenomenology of those technihadrons and the discovery channels are also discussed, which are smoking-guns of the walking technicolor, to be accessible at the LHC-Run II. |
1401.3572 | Pyungwon Ko | P. Ko (KIAS), Yuji Omura (TUM) and Chaehyun Yu (KIAS) | Multi-Higgs doublet models with local $U(1)_H$ gauge symmetry and
neutrino physics therein | Contribution to the proceeding for the 2013 CETUP* Workshop on
Neutrino and Astrophysics. arXiv admin note: text overlap with
arXiv:1302.2195, arXiv:1204.4588 | null | 10.1063/1.4883433 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Multi-Higgs doublet models appear in many interesting extensions of the
standard model (SM). But they suffer from Higgs-mediated flavor changing
neutral current (FCNC) problem which is very generic. In this talk, I describe
that this problem can be resolved or mitigated if we introduce local $U(1)_H$
Higgs flavor gauge symmetry. As examples, I describe chiral $U(1)_{H}$ models
where the right-handed up-type quarks also carry $U(1)_H$ charges and discuss
the top forward-backward asymmetry (FBA) and $B\rightarrow D^{(*)} \tau \nu$
puzzle. Next I describe the two-Higgs doublet models where the usual $Z_2$
symmetry is implemented to $U(1)_H$ and show how the Type-I and Type-II models
are extended. One possible extension of Type-II has the same fermion contents
with the leptophobic $E_6$ $Z^{'}$ model by Rosner, and I discuss the neutrino
sector in this model briefly.
| [
{
"created": "Wed, 15 Jan 2014 13:19:03 GMT",
"version": "v1"
}
] | 2015-06-18 | [
[
"Ko",
"P.",
"",
"KIAS"
],
[
"Omura",
"Yuji",
"",
"TUM"
],
[
"Yu",
"Chaehyun",
"",
"KIAS"
]
] | Multi-Higgs doublet models appear in many interesting extensions of the standard model (SM). But they suffer from Higgs-mediated flavor changing neutral current (FCNC) problem which is very generic. In this talk, I describe that this problem can be resolved or mitigated if we introduce local $U(1)_H$ Higgs flavor gauge symmetry. As examples, I describe chiral $U(1)_{H}$ models where the right-handed up-type quarks also carry $U(1)_H$ charges and discuss the top forward-backward asymmetry (FBA) and $B\rightarrow D^{(*)} \tau \nu$ puzzle. Next I describe the two-Higgs doublet models where the usual $Z_2$ symmetry is implemented to $U(1)_H$ and show how the Type-I and Type-II models are extended. One possible extension of Type-II has the same fermion contents with the leptophobic $E_6$ $Z^{'}$ model by Rosner, and I discuss the neutrino sector in this model briefly. |
hep-ph/0505055 | Zvi Bern | Zvi Bern, Lance J. Dixon and David A. Kosower | The Last of the Finite Loop Amplitudes in QCD | 45 pages, revtex, 7 figures, v2 minor corrections | Phys.Rev.D72:125003,2005 | 10.1103/PhysRevD.72.125003 | SLAC-PUB-11134, UCLA/05/TEP/15, Saclay/SPhT-T05/058 | hep-ph | null | We use on-shell recursion relations to determine the one-loop QCD scattering
amplitudes with a massless external quark pair and an arbitrary number (n-2) of
positive-helicity gluons. These amplitudes are the last of the unknown
infrared- and ultraviolet-finite loop amplitudes of QCD. The recursion
relations are similar to ones applied at tree level, but contain new
non-trivial features corresponding to poles present for complex momentum
arguments but absent for real momenta. We present the relations and the compact
solutions to them, valid for all n. We also present compact forms for the
previously-computed one-loop n-gluon amplitudes with a single negative helicity
and the rest positive helicity.
| [
{
"created": "Sat, 7 May 2005 19:40:44 GMT",
"version": "v1"
},
{
"created": "Thu, 25 May 2006 00:32:28 GMT",
"version": "v2"
}
] | 2010-11-15 | [
[
"Bern",
"Zvi",
""
],
[
"Dixon",
"Lance J.",
""
],
[
"Kosower",
"David A.",
""
]
] | We use on-shell recursion relations to determine the one-loop QCD scattering amplitudes with a massless external quark pair and an arbitrary number (n-2) of positive-helicity gluons. These amplitudes are the last of the unknown infrared- and ultraviolet-finite loop amplitudes of QCD. The recursion relations are similar to ones applied at tree level, but contain new non-trivial features corresponding to poles present for complex momentum arguments but absent for real momenta. We present the relations and the compact solutions to them, valid for all n. We also present compact forms for the previously-computed one-loop n-gluon amplitudes with a single negative helicity and the rest positive helicity. |
1604.08392 | Erica Vagnoni | Erica Vagnoni | Neutrino energy reconstruction in long-baseline experiments | Poster presented at NuPhys2015 (London, 16-18 December 2015). 5
pages, LaTeX, 2 figures | null | null | NuPhys2015-Vagnoni | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Modern experiments aimed at measuring neutrino oscillation parameters have
entered the age of precision. The determination of these parameters strongly
depends on the ability to reconstruct the energy distributions of the neutrino
beams. We compare two different energy reconstruction techniques: the
reconstruction based on the kinematic of the outgoing lepton and the one based
on the calorimetric method. Furthermore, we analyze realistic detector
capabilities, such as energy resolutions, thresholds and efficiencies, in order
to estimate how well they need to be evaluated to avoid a significant bias in
the extraction of the oscillation parameters.
| [
{
"created": "Thu, 28 Apr 2016 12:50:14 GMT",
"version": "v1"
}
] | 2016-04-29 | [
[
"Vagnoni",
"Erica",
""
]
] | Modern experiments aimed at measuring neutrino oscillation parameters have entered the age of precision. The determination of these parameters strongly depends on the ability to reconstruct the energy distributions of the neutrino beams. We compare two different energy reconstruction techniques: the reconstruction based on the kinematic of the outgoing lepton and the one based on the calorimetric method. Furthermore, we analyze realistic detector capabilities, such as energy resolutions, thresholds and efficiencies, in order to estimate how well they need to be evaluated to avoid a significant bias in the extraction of the oscillation parameters. |
hep-ph/0303251 | Stefano Moretti | J.L. Diaz-Cruz (BUAP-Mexico), D.K. Ghosh (Eugene) and S. Moretti
(Southampton) | The di-photon signature of Higgs bosons in GMSB models at the LHC | 17 pages, latex, 4 figures (preprint number and reference added) | Phys.Rev.D68:014019,2003 | 10.1103/PhysRevD.68.014019 | HEP-IFUAP-02-03, OITS-729, SHEP-03-05 | hep-ph | null | We show how the well studied $\gamma\gamma$ inclusive Higgs signal can be
used at the Large Hadron Collider to test Gauge Mediated Supersymmetry Breaking
scenarios in which a rather heavy Higgs boson decays into two light
neutralinos, the latter yielding two photons and missing (transverse) energy
| [
{
"created": "Sat, 29 Mar 2003 17:37:22 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Apr 2003 17:27:38 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Diaz-Cruz",
"J. L.",
"",
"BUAP-Mexico"
],
[
"Ghosh",
"D. K.",
"",
"Eugene"
],
[
"Moretti",
"S.",
"",
"Southampton"
]
] | We show how the well studied $\gamma\gamma$ inclusive Higgs signal can be used at the Large Hadron Collider to test Gauge Mediated Supersymmetry Breaking scenarios in which a rather heavy Higgs boson decays into two light neutralinos, the latter yielding two photons and missing (transverse) energy |
2107.03807 | Ayon Patra Dr. | Tapoja Jha, Sarif Khan, Manimala Mitra, Ayon Patra | Zooming in on eV-MeV Scale Sterile Neutrinos in light of Neutrinoless
Double Beta Decay | 33 pages, 16 figures. Comments are welcome | null | 10.1103/PhysRevD.105.035001 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The existence of light sterile neutrinos, as predicted in several models, can
help to explain a number of observations starting from dark mater to recent
anomalies in short baseline experiments. In this paper we consider two models -
Left-Right Symmetric Zee model and Extended Seesaw model, that can naturally
accommodate the presence of light sterile neutrinos in the eV to MeV mass
scale. We perform a detailed study on the neutrinoless double beta decay
process which receives major contributions from diagrams involving these light
sterile neutrinos. Considering a number of theoretical and experimental
constraints, including light neutrino masses and mixings, unitarity of the
mixing matrix etc., we compare our predicted values of the half-life of
neutrinoless double beta decay with the experimental limits. This can put
significant constraints on the neutrino mass, active-sterile neutrino mixing
and several other important parameters in these models.
| [
{
"created": "Thu, 8 Jul 2021 12:29:16 GMT",
"version": "v1"
}
] | 2022-02-16 | [
[
"Jha",
"Tapoja",
""
],
[
"Khan",
"Sarif",
""
],
[
"Mitra",
"Manimala",
""
],
[
"Patra",
"Ayon",
""
]
] | The existence of light sterile neutrinos, as predicted in several models, can help to explain a number of observations starting from dark mater to recent anomalies in short baseline experiments. In this paper we consider two models - Left-Right Symmetric Zee model and Extended Seesaw model, that can naturally accommodate the presence of light sterile neutrinos in the eV to MeV mass scale. We perform a detailed study on the neutrinoless double beta decay process which receives major contributions from diagrams involving these light sterile neutrinos. Considering a number of theoretical and experimental constraints, including light neutrino masses and mixings, unitarity of the mixing matrix etc., we compare our predicted values of the half-life of neutrinoless double beta decay with the experimental limits. This can put significant constraints on the neutrino mass, active-sterile neutrino mixing and several other important parameters in these models. |
hep-ph/0505139 | Jishnu Dey | Manjari Bagchi, Monika Sinha, Mira Dey and Jishnu Dey | Decoupling of pion coupling f_{\pi} from quarks at high density in three
models, and its possible observational consequences | 13 pages, 2 figures. Accepted for publication in PLB | Phys.Lett.B618:115-122,2005 | 10.1016/j.physletb.2005.05.031 | null | hep-ph astro-ph | null | Chiral symmetry is restored at high density, quarks become nearly massless
and pion, the Goldstone of the symmetry breaking decouples from the quarks.
What happens at high density is important for finding the density dependence of
Strange Quark Matter (SQM), - which in turn is relevant for understanding the
structure of compact stars.
| [
{
"created": "Mon, 16 May 2005 10:04:12 GMT",
"version": "v1"
}
] | 2014-11-18 | [
[
"Bagchi",
"Manjari",
""
],
[
"Sinha",
"Monika",
""
],
[
"Dey",
"Mira",
""
],
[
"Dey",
"Jishnu",
""
]
] | Chiral symmetry is restored at high density, quarks become nearly massless and pion, the Goldstone of the symmetry breaking decouples from the quarks. What happens at high density is important for finding the density dependence of Strange Quark Matter (SQM), - which in turn is relevant for understanding the structure of compact stars. |
2405.05042 | Liang Tang | Chun-Meng Tang, Chun-Gui Duan, Liang Tang | Fully Charmed Tetraquark States in $8_{[c\bar{c}]}\otimes8_{[c\bar{c}]}$
Color Structure via QCD Sum Rules | 19 pages, 4 figures, 1 table. To match the published version | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Stimulated by the recent experimental results on the fully-charm tetraquark
states, we systematically calculate the mass spectra of the fully-charm
tetraquark states in $8_{[c\bar{c}]}\otimes8_{[c\bar{c}]}$ color configuration
via QCD sum rules. By constructing nine $8_{[c\bar{c}]}\otimes8_{[c\bar{c}]}$
type currents with quantum numbers $J^{PC}=0^{-+},0^{--},1^{-+},1^{+-},1^{--}$
and $2^{++}$, we perform analytic calculation up to dimension six in the
Operator Product Expansion (OPE). We find the fully-charm tetraquark states
with $J^{PC}=1^{+-},2^{++}$ lie around 6.48 $\sim$ 6.62 GeV while the
fully-charm tetraquark states with $J^{PC}=0^{-+},0^{--},1^{--},1^{-+}$ are
about 6.85 $\sim$ 7.02 GeV. Notably, the mass predictions for the
$c\bar{c}c\bar{c}$ tetraquarks, specifically those with $J^{PC}=2^{++}$, align
with the broad structure identified by LHCb. Moreover, the masses of
fully-charm tetraquarks with $J^{PC}=0^{-+}$ and $1^{-+}$ are anticipated to
match closely with the mass of X(6900), considering the margin of error. Such
findings hint at the presence of some $8_{[c\bar{c}]}\otimes8_{[c\bar{c}]}$
components within the di-$J/\psi$ structures observed by LHCb. The predictions
for tetraquark states with $J^{PC}=0^{--},1^{+-},1^{--}$ may be accessible in
the future BelleII, Super-B, PANDA, and LHCb experiments.
| [
{
"created": "Wed, 8 May 2024 13:27:22 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Aug 2024 00:26:53 GMT",
"version": "v2"
}
] | 2024-08-06 | [
[
"Tang",
"Chun-Meng",
""
],
[
"Duan",
"Chun-Gui",
""
],
[
"Tang",
"Liang",
""
]
] | Stimulated by the recent experimental results on the fully-charm tetraquark states, we systematically calculate the mass spectra of the fully-charm tetraquark states in $8_{[c\bar{c}]}\otimes8_{[c\bar{c}]}$ color configuration via QCD sum rules. By constructing nine $8_{[c\bar{c}]}\otimes8_{[c\bar{c}]}$ type currents with quantum numbers $J^{PC}=0^{-+},0^{--},1^{-+},1^{+-},1^{--}$ and $2^{++}$, we perform analytic calculation up to dimension six in the Operator Product Expansion (OPE). We find the fully-charm tetraquark states with $J^{PC}=1^{+-},2^{++}$ lie around 6.48 $\sim$ 6.62 GeV while the fully-charm tetraquark states with $J^{PC}=0^{-+},0^{--},1^{--},1^{-+}$ are about 6.85 $\sim$ 7.02 GeV. Notably, the mass predictions for the $c\bar{c}c\bar{c}$ tetraquarks, specifically those with $J^{PC}=2^{++}$, align with the broad structure identified by LHCb. Moreover, the masses of fully-charm tetraquarks with $J^{PC}=0^{-+}$ and $1^{-+}$ are anticipated to match closely with the mass of X(6900), considering the margin of error. Such findings hint at the presence of some $8_{[c\bar{c}]}\otimes8_{[c\bar{c}]}$ components within the di-$J/\psi$ structures observed by LHCb. The predictions for tetraquark states with $J^{PC}=0^{--},1^{+-},1^{--}$ may be accessible in the future BelleII, Super-B, PANDA, and LHCb experiments. |
2308.06042 | Carsten Schneider | Johannes Bluemlein, Nikolai Fadeev, Carsten Schneider | Computing Mellin representations and asymptotics of nested binomial sums
in a symbolic way: the RICA package | null | ACM Communications in Computer Algebra, Vol. 57, No. 2, Issue 224,
June 2023 | 10.1145/3614408.3614410 | RISC Report Series 23-11 | hep-ph cs.SC | http://creativecommons.org/licenses/by/4.0/ | Nested binomial sums form a particular class of sums that arise in the
context of particle physics computations at higher orders in perturbation
theory within QCD and QED, but that are also mathematically relevant, e.g., in
combinatorics. We present the package RICA (Rule Induced Convolutions for
Asymptotics), which aims at calculating Mellin representations and asymptotic
expansions at infinity of those objects. These representations are of
particular interest to perform analytic continuations of such sums.
| [
{
"created": "Fri, 11 Aug 2023 09:43:05 GMT",
"version": "v1"
}
] | 2023-08-14 | [
[
"Bluemlein",
"Johannes",
""
],
[
"Fadeev",
"Nikolai",
""
],
[
"Schneider",
"Carsten",
""
]
] | Nested binomial sums form a particular class of sums that arise in the context of particle physics computations at higher orders in perturbation theory within QCD and QED, but that are also mathematically relevant, e.g., in combinatorics. We present the package RICA (Rule Induced Convolutions for Asymptotics), which aims at calculating Mellin representations and asymptotic expansions at infinity of those objects. These representations are of particular interest to perform analytic continuations of such sums. |
hep-ph/9411425 | Patrick Peter | Brandon Carter and Patrick Peter | Supersonic String Model for Witten Vortices | 7 pages, LaTeX-RevTeX, no figures | Phys.Rev.D52:1744-1748,1995 | 10.1103/PhysRevD.52.1744 | DAMTP R-94/56 | hep-ph astro-ph gr-qc hep-th | null | A new cosmic string model specified by two independent mass parameters is
introduced for the purpose of providing a realistic representation of the
macroscopic dynamical behaviour of Witten type (superconducting) vortex defects
of the vacuum. Unlike the self dual single mass parameter models previously
used for this purpose, the new model successfully represents the effect of
current saturation and the feature that wiggle propagation remains supersonic
even in the weak current limit.
| [
{
"created": "Tue, 29 Nov 1994 18:49:00 GMT",
"version": "v1"
}
] | 2010-12-13 | [
[
"Carter",
"Brandon",
""
],
[
"Peter",
"Patrick",
""
]
] | A new cosmic string model specified by two independent mass parameters is introduced for the purpose of providing a realistic representation of the macroscopic dynamical behaviour of Witten type (superconducting) vortex defects of the vacuum. Unlike the self dual single mass parameter models previously used for this purpose, the new model successfully represents the effect of current saturation and the feature that wiggle propagation remains supersonic even in the weak current limit. |
hep-ph/0210062 | Takufumi Yoshida | T.Yoshida, K.Ogure and J.Arafune | Stability of Fermi ball against deformation from spherical shape | 38 pages in RevTeX, 10 figures | Phys.Rev. D67 (2003) 083506 | 10.1103/PhysRevD.67.083506 | KOBE-TH-02-01 | hep-ph astro-ph hep-ex hep-th | null | The stability of a Fermi ball (F-ball), which is a kind of non-topological
soliton accompanying the breakdown of the approximate $Z_2$ symmetry, is
investigated in three situations: the case it is electrically neutral, the case
it is electrically charged and unscreened, and the case it is electrically
charged and screened. We argue only the third case is physically meaningful
since the neutral F-ball is unstable and the case of the unscreened charged one
is observationally excluded when it has a sizable contribution to CDM. We found
that the energy scale of the breakdown of the approximate $Z_2$ symmetry $v$
should satisfy $v<3\times 10^6 {GeV}$ if the F-ball is a main component of CDM.
| [
{
"created": "Thu, 3 Oct 2002 14:23:45 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Yoshida",
"T.",
""
],
[
"Ogure",
"K.",
""
],
[
"Arafune",
"J.",
""
]
] | The stability of a Fermi ball (F-ball), which is a kind of non-topological soliton accompanying the breakdown of the approximate $Z_2$ symmetry, is investigated in three situations: the case it is electrically neutral, the case it is electrically charged and unscreened, and the case it is electrically charged and screened. We argue only the third case is physically meaningful since the neutral F-ball is unstable and the case of the unscreened charged one is observationally excluded when it has a sizable contribution to CDM. We found that the energy scale of the breakdown of the approximate $Z_2$ symmetry $v$ should satisfy $v<3\times 10^6 {GeV}$ if the F-ball is a main component of CDM. |
1305.3763 | Tanumoy Mandal | Rahul Basu, Tanumoy Mandal | Graviton Signals in Central Production at the LHC | 25 pages, 15 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study central production, in the inclusive case, to look
for graviton signals in large extra dimensional model using dilepton and
diphoton channels. We carefully analyze signal and possible Standard Model
background processes and study the feasibility of such new physics searches in
a relatively clean environment as in central production where the proton
fragments are mostly emitted in the forward direction, and there is a clear
rapidity gap between them and the centrally produced system. Our analysis shows
that the LHC with 14 TeV center of mass energy and 100 fb$^{-1}$ (300
fb$^{-1}$) of integrated luminosity can probe the effective gravity scale up to
3.6 TeV (4.4 TeV) in both the dilepton and diphoton channels.
| [
{
"created": "Thu, 16 May 2013 11:38:29 GMT",
"version": "v1"
}
] | 2013-05-17 | [
[
"Basu",
"Rahul",
""
],
[
"Mandal",
"Tanumoy",
""
]
] | In this paper, we study central production, in the inclusive case, to look for graviton signals in large extra dimensional model using dilepton and diphoton channels. We carefully analyze signal and possible Standard Model background processes and study the feasibility of such new physics searches in a relatively clean environment as in central production where the proton fragments are mostly emitted in the forward direction, and there is a clear rapidity gap between them and the centrally produced system. Our analysis shows that the LHC with 14 TeV center of mass energy and 100 fb$^{-1}$ (300 fb$^{-1}$) of integrated luminosity can probe the effective gravity scale up to 3.6 TeV (4.4 TeV) in both the dilepton and diphoton channels. |
1407.4045 | Robert Thorne S | R.S. Thorne, L.A. Harland-Lang, A.D. Martin and P. Motylinski | Updates of PDFs in the MSTW framework | 6 pages, 6 figures,Published in PoS DIS (2014) | null | null | IPPP/14/63, LCTS/2014-25 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I present results on updates on PDFs which are obtained within the general
framework which led to the MSTW2008 PDF sets. There are some theory and
procedural improvements and a variety of new data sets, including many relevant
up-to-date LHC data. A new set of PDFs is very close to being finalised, with
no significant changes expected to the preliminary PDFs shown here.
| [
{
"created": "Tue, 15 Jul 2014 16:32:17 GMT",
"version": "v1"
}
] | 2014-07-16 | [
[
"Thorne",
"R. S.",
""
],
[
"Harland-Lang",
"L. A.",
""
],
[
"Martin",
"A. D.",
""
],
[
"Motylinski",
"P.",
""
]
] | I present results on updates on PDFs which are obtained within the general framework which led to the MSTW2008 PDF sets. There are some theory and procedural improvements and a variety of new data sets, including many relevant up-to-date LHC data. A new set of PDFs is very close to being finalised, with no significant changes expected to the preliminary PDFs shown here. |
hep-ph/9905414 | A. Thomas | A.W. Thomas, D.B. Leinweber (CSSM, University of Adelaide), D.H. Lu
(National Taiwan University) | Non-perturbative chiral corrections for lattice QCD | 7 pages, Invited talk presented at NEWS 99, University of Osaka,
March 9-12, 1999 | null | null | ADP-99-18/T360 | hep-ph | null | We explore the chiral aspects of extrapolation of observables calculated
within lattice QCD, using the nucleon magnetic moments as an example. Our
analysis shows that the biggest effects of chiral dynamics occur for quark
masses corresponding to a pion mass below 600 MeV. In this limited range chiral
perturbation theory is not rapidly convergent, but we can develop some
understanding of the behaviour through chiral quark models. This model
dependent analysis leads us to a simple Pad\'e approximant which builds in both
the limits $m_\pi \to 0$ and $m_\pi \to \infty$ correctly and permits a
consistent, model independent extrapolation to the physical pion mass which
should be extremely reliable.
| [
{
"created": "Thu, 20 May 1999 08:53:33 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Thomas",
"A. W.",
"",
"CSSM, University of Adelaide"
],
[
"Leinweber",
"D. B.",
"",
"CSSM, University of Adelaide"
],
[
"Lu",
"D. H.",
"",
"National Taiwan University"
]
] | We explore the chiral aspects of extrapolation of observables calculated within lattice QCD, using the nucleon magnetic moments as an example. Our analysis shows that the biggest effects of chiral dynamics occur for quark masses corresponding to a pion mass below 600 MeV. In this limited range chiral perturbation theory is not rapidly convergent, but we can develop some understanding of the behaviour through chiral quark models. This model dependent analysis leads us to a simple Pad\'e approximant which builds in both the limits $m_\pi \to 0$ and $m_\pi \to \infty$ correctly and permits a consistent, model independent extrapolation to the physical pion mass which should be extremely reliable. |
hep-ph/9312293 | Janne Ignatius | J. Ignatius | Cosmological Phase Transitions | introductory part of Ph.D. dissertation, 53 LaTeX pages + 10 figures
not included. (Figs are available via airmail, or as a 430 kB PostScript file
via anonymous ftp at fltxc.helsinki.fi (128.214.3.11), directory /pub, file
phdfigs.ps .) HU-TFT-IR-93-1 | null | null | null | hep-ph astro-ph | null | Physical processes related to cosmological first-order phase transitions are
discussed and reviewed in this introductory part of dissertation. I first
describe cosmological phase transitions on a general level, concentrating on
bubble nucleation, phase change, and related phenomena. I point out that
especially the onset of a cosmological phase transition shows a universal
behavior. Then I discuss the electroweak and quark-hadron phase transitions
from a more phenomenological point of view, and present a partially
quantitative description of the different events that is believed to have taken
place during these two cosmological transitions.
| [
{
"created": "Wed, 15 Dec 1993 22:45:54 GMT",
"version": "v1"
}
] | 2009-09-25 | [
[
"Ignatius",
"J.",
""
]
] | Physical processes related to cosmological first-order phase transitions are discussed and reviewed in this introductory part of dissertation. I first describe cosmological phase transitions on a general level, concentrating on bubble nucleation, phase change, and related phenomena. I point out that especially the onset of a cosmological phase transition shows a universal behavior. Then I discuss the electroweak and quark-hadron phase transitions from a more phenomenological point of view, and present a partially quantitative description of the different events that is believed to have taken place during these two cosmological transitions. |
0905.2124 | Mathieu Rubin | Mathieu Rubin | Light Higgs searches at the LHC using jet substructure | 5 pages, 3 figures, contribution to the proceedings of the XLIIIth
Rencontres de Moriond: QCD and high energy interactions, La Thuile, Italy,
march 14-21, 2009. Minor change: modified reference 6 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is widely believed that searching for a light Higgs boson (with a mass
around 120 GeV) in the WH and ZH channels, where H decays into $b\bar{b}$, will
be very challenging at the LHC. These proceedings describe how this channel can
be recovered as a promising search channel at high $p_t$ by using a subjet
analysis procedure.
| [
{
"created": "Wed, 13 May 2009 15:22:46 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Jun 2009 15:49:58 GMT",
"version": "v2"
}
] | 2009-06-26 | [
[
"Rubin",
"Mathieu",
""
]
] | It is widely believed that searching for a light Higgs boson (with a mass around 120 GeV) in the WH and ZH channels, where H decays into $b\bar{b}$, will be very challenging at the LHC. These proceedings describe how this channel can be recovered as a promising search channel at high $p_t$ by using a subjet analysis procedure. |
hep-ph/0210332 | Dmitri Kharzeev | D. Kharzeev, E. Levin and L. McLerran | Parton saturation and N_part scaling of semi--hard processes in QCD | 13 pages, 3 figures, LaTeX; significantly extended version | Phys.Lett.B561:93-101,2003 | 10.1016/S0370-2693(03)00420-9 | BNL-NT-02/22 | hep-ph | null | We argue that the suppression of high p_t hadrons discovered recently in
heavy ion collisions at RHIC may be a consequence of saturation in the Color
Glass Condensate. We qualitatively and semi-quantitatively describe the data,
in particular, the dependence upon the number of nucleon participants. We show
that if parton saturation sets in at sufficiently small energy, then in
nucleus-nucleus collisions at RHIC and LHC energies the cross sections of
semi-hard processes should scale approximately with the number of participants,
N_{part}. Our results provide a possible explanation of both the absence of
apparent jet quenching at SPS energies and its presence at RHIC. Under the same
assumption we predict that in semi--central and central pA (dA) collisions at
collider energies the dependence of semi--hard processes on the number of
participating nucleons of the nucleus will change to \sim (N_{part}^A)^{1/2}.
The forthcoming data on dA collisions will provide a crucial test of this
description.
| [
{
"created": "Thu, 24 Oct 2002 15:37:11 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Dec 2002 20:18:58 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Kharzeev",
"D.",
""
],
[
"Levin",
"E.",
""
],
[
"McLerran",
"L.",
""
]
] | We argue that the suppression of high p_t hadrons discovered recently in heavy ion collisions at RHIC may be a consequence of saturation in the Color Glass Condensate. We qualitatively and semi-quantitatively describe the data, in particular, the dependence upon the number of nucleon participants. We show that if parton saturation sets in at sufficiently small energy, then in nucleus-nucleus collisions at RHIC and LHC energies the cross sections of semi-hard processes should scale approximately with the number of participants, N_{part}. Our results provide a possible explanation of both the absence of apparent jet quenching at SPS energies and its presence at RHIC. Under the same assumption we predict that in semi--central and central pA (dA) collisions at collider energies the dependence of semi--hard processes on the number of participating nucleons of the nucleus will change to \sim (N_{part}^A)^{1/2}. The forthcoming data on dA collisions will provide a crucial test of this description. |
hep-ph/0402149 | Gennaro Corcella | Gennaro Corcella (CERN & MPI, Munich), Stefano Moretti (Southampton
U.) | Matrix-element corrections to gg/qqbar -> Higgs in HERWIG | 3 pages, 5 figures. Contributed to 3rd Les Houches Workshop: Physics
at TeV Colliders, Les Houches, France, 26 May - 6 Jun 2003 | null | null | CERN-PH-TH-2004-014, MPP-2004-11, SHEP-04-01 | hep-ph | null | We describe the HERWIG implementation of real matrix-element corrections to
direct Higgs hadroproduction at Tevatron and Large Hadron Collider (LHC) and
compare it to other approaches existing in literature and describing the
transverse momentum distribution of the Higgs boson.
| [
{
"created": "Fri, 13 Feb 2004 19:01:19 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Corcella",
"Gennaro",
"",
"CERN & MPI, Munich"
],
[
"Moretti",
"Stefano",
"",
"Southampton\n U."
]
] | We describe the HERWIG implementation of real matrix-element corrections to direct Higgs hadroproduction at Tevatron and Large Hadron Collider (LHC) and compare it to other approaches existing in literature and describing the transverse momentum distribution of the Higgs boson. |
hep-ph/9402244 | null | R. Foot | A parity invariant $SU(3)_c \otimes SU(3)_L \otimes U(1)$ model | 6, McGill/94-11 | Mod.Phys.Lett. A10 (1995) 159-164 | 10.1142/S021773239500017X | null | hep-ph | null | We examine a $SU(3)_c \otimes SU(3)_{L}\otimes U(1)$ gauge model which has a
parity symmetric Lagrangian. The parity symmetry has the novel feature that it
interchanges the gluons with the $SU(3)_L$ gauge bosons (which contain the
ordinary $SU(2)_L$ weak gauge bosons). We show that the model reduces to the
standard model at low energies and also predicts new physics in the form of
exotic fermions.
| [
{
"created": "Mon, 7 Feb 1994 23:01:48 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Foot",
"R.",
""
]
] | We examine a $SU(3)_c \otimes SU(3)_{L}\otimes U(1)$ gauge model which has a parity symmetric Lagrangian. The parity symmetry has the novel feature that it interchanges the gluons with the $SU(3)_L$ gauge bosons (which contain the ordinary $SU(2)_L$ weak gauge bosons). We show that the model reduces to the standard model at low energies and also predicts new physics in the form of exotic fermions. |
hep-ph/0103327 | Vishnu Mayya Bannur | Vishnu Mayya Bannur | Thermalization in Yang-Mills Classical Mechanics | Latex file (10 pages), Postscript file of 1 figure | null | null | null | hep-ph | null | We use quartic oscillators system with two degrees of freedom to model
Yang-Mills classical mechanics. This simple model explains qualitatively many
features reported in lattice calculation of $(3+1)$ - dimensional classical
Yang-Mills system. The largest Lyapunov exponent ($\lambda$) and the
thermalization time were numerically evaluated. We also show, in our model,
that $\lambda$ scales with 4th root of energy density. Here thermalization is
due to relaxation phenomena associated with the color degrees of freedom. From
the physical picture of thermalization, we speculate that the system with
coherent fields (flux tubes) formed in relativistic heavy ion collisions can
relax by chaos and the estimated thermalization time can be smaller than $1
fm/c$.
| [
{
"created": "Fri, 30 Mar 2001 05:59:52 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bannur",
"Vishnu Mayya",
""
]
] | We use quartic oscillators system with two degrees of freedom to model Yang-Mills classical mechanics. This simple model explains qualitatively many features reported in lattice calculation of $(3+1)$ - dimensional classical Yang-Mills system. The largest Lyapunov exponent ($\lambda$) and the thermalization time were numerically evaluated. We also show, in our model, that $\lambda$ scales with 4th root of energy density. Here thermalization is due to relaxation phenomena associated with the color degrees of freedom. From the physical picture of thermalization, we speculate that the system with coherent fields (flux tubes) formed in relativistic heavy ion collisions can relax by chaos and the estimated thermalization time can be smaller than $1 fm/c$. |
1810.07848 | Wei Wang | Luciano Maiani, Veronica Riquer, Wei Wang | Tetraquarks, Pentaquarks and Dibaryons in the large $N$ QCD | 9 pages, 6 figures; v2: discussions on phase space added in the
appendix | Eur. Phys. J. C (2018) 78: 1011 | 10.1140/epjc/s10052-018-6486-5 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the multiquark hadrons in large $N$ QCD under the 't-Hooft limit,
extending Witten's picture of the baryons. We explore the decay widths of
tetraquarks, pentaquarks and dibaryons. Based on the decay behaviors, we point
out in the $N\to \infty$ limit decay widths of tetraquarks stay constant, while
those of pentaquarks and dibaryons above certain thresholds can diverge. In the
large $N$ limit, we find that the ground states of the three spectroscopic
series are stable or narrow and that the excited states of pentaquarks and
dibaryons above the indicated thresholds are not observables. We compare our
results with those obtained in a different large $N$ generalization of
tetraquarks.
| [
{
"created": "Thu, 18 Oct 2018 00:35:55 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Nov 2018 02:43:38 GMT",
"version": "v2"
}
] | 2018-12-18 | [
[
"Maiani",
"Luciano",
""
],
[
"Riquer",
"Veronica",
""
],
[
"Wang",
"Wei",
""
]
] | We study the multiquark hadrons in large $N$ QCD under the 't-Hooft limit, extending Witten's picture of the baryons. We explore the decay widths of tetraquarks, pentaquarks and dibaryons. Based on the decay behaviors, we point out in the $N\to \infty$ limit decay widths of tetraquarks stay constant, while those of pentaquarks and dibaryons above certain thresholds can diverge. In the large $N$ limit, we find that the ground states of the three spectroscopic series are stable or narrow and that the excited states of pentaquarks and dibaryons above the indicated thresholds are not observables. We compare our results with those obtained in a different large $N$ generalization of tetraquarks. |
1604.04308 | Anton Motornenko | A. Motornenko and M. I. Gorenstein | Cumulative production of pions by heavy baryonic resonances in
proton-nucleus collisions | 21 pages, 36 figures | null | 10.1088/1361-6471/aa51f6 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Pion production in proton-nucleus (p+A) collisions outside the kinematical
boundary of proton-nucleon (p+N) reactions, the so-called cumulative effect, is
studied. Restrictions from energy-momentum conservation on the energy of pions
emitted in the backward direction in the target rest frame are analyzed. It is
assumed that the cumulative pions are produced in p+A reactions by heavy
baryonic resonances. The baryonic resonances are first created in p+N
reactions. Due to successive collisions with nuclear nucleons the masses of
these resonances may then increase and, simultaneously, their longitudinal
velocities decrease. We also use the Ultra relativistic Quantum Molecular
Dynamics model to reveal the key role of successive collisions of baryonic
resonances with nuclear nucleons for cumulative pion production in p+A
reactions. Further experimental studies of cumulative hadron production in p+A
reactions at high collision energies are needed to search for heavy hadron-like
objects and investigate their properties.
| [
{
"created": "Thu, 14 Apr 2016 21:35:33 GMT",
"version": "v1"
}
] | 2017-02-01 | [
[
"Motornenko",
"A.",
""
],
[
"Gorenstein",
"M. I.",
""
]
] | Pion production in proton-nucleus (p+A) collisions outside the kinematical boundary of proton-nucleon (p+N) reactions, the so-called cumulative effect, is studied. Restrictions from energy-momentum conservation on the energy of pions emitted in the backward direction in the target rest frame are analyzed. It is assumed that the cumulative pions are produced in p+A reactions by heavy baryonic resonances. The baryonic resonances are first created in p+N reactions. Due to successive collisions with nuclear nucleons the masses of these resonances may then increase and, simultaneously, their longitudinal velocities decrease. We also use the Ultra relativistic Quantum Molecular Dynamics model to reveal the key role of successive collisions of baryonic resonances with nuclear nucleons for cumulative pion production in p+A reactions. Further experimental studies of cumulative hadron production in p+A reactions at high collision energies are needed to search for heavy hadron-like objects and investigate their properties. |
hep-ph/0011234 | Joe Sato | T. Ota, J. Sato | Matter profile effect in neutrino factory | 21 pages, 15 figures | Phys.Rev. D63 (2001) 093004 | 10.1103/PhysRevD.63.093004 | KYUSHU-HET 47 | hep-ph | null | We point out that the matter profile effect --- the effect of matter density
fluctuation on the baseline --- is very important to estimate the parameters in
a neutrino factory with a very long baseline. To make it clear, we propose the
method of the Fourier series expansion of the matter profile. By using this
method, we can take account of both the matter profile effect and its
ambiguity. For very long baseline experiment, such as L=7332km, in the analysis
of the oscillation phenomena we need to introduce a new parameter $ a_{1} $---
the Fourier coefficient of the matter profile --- as a theoretical parameter to
deal with the matter profile effects.
| [
{
"created": "Sun, 19 Nov 2000 13:56:05 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Ota",
"T.",
""
],
[
"Sato",
"J.",
""
]
] | We point out that the matter profile effect --- the effect of matter density fluctuation on the baseline --- is very important to estimate the parameters in a neutrino factory with a very long baseline. To make it clear, we propose the method of the Fourier series expansion of the matter profile. By using this method, we can take account of both the matter profile effect and its ambiguity. For very long baseline experiment, such as L=7332km, in the analysis of the oscillation phenomena we need to introduce a new parameter $ a_{1} $--- the Fourier coefficient of the matter profile --- as a theoretical parameter to deal with the matter profile effects. |
1410.0137 | Fenosoa Fanomezana | F.Fanomezana, S.Narison, A.Rabemananjara | $\bar D^*D^*_0$ and $\bar B^*B^*_0 (1^--)$ molecules at N2LO from QSSR | 4 pages, 12 figures, Talk given at the 17th International Conference
on Quantum Chromodynamics (QCD 14) (29 june - 3 july 2014,
Montpellier-France), to appear in Nucl. Phys. B (Proc. Suppl.) | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We estimate the $\bar D^*D^*_0$ and $\bar B^*B^*_0(1^--)$ molecules masses
and couplings using QCD spectral sum rules (QSSR)known perturbatively to N2LO
of PT series and including the contributions of non-perturabtive condensates up
to the dimension-eight. Our results improve earlier LO results obtained from
QSSR in the current literature. We obtain $M_{D^*D^*_0} = 5244(228)$ MeV which
is heavier than the experimental candidates Y(4260); Y(4360); Y(4660)
suggesting that they cannot be pure molecule states. We predict $M_{B^*B^*_0}=
11920(159)$ MeV to be tested in B-factory experiments.
| [
{
"created": "Wed, 1 Oct 2014 07:56:48 GMT",
"version": "v1"
}
] | 2014-10-02 | [
[
"Fanomezana",
"F.",
""
],
[
"Narison",
"S.",
""
],
[
"Rabemananjara",
"A.",
""
]
] | We estimate the $\bar D^*D^*_0$ and $\bar B^*B^*_0(1^--)$ molecules masses and couplings using QCD spectral sum rules (QSSR)known perturbatively to N2LO of PT series and including the contributions of non-perturabtive condensates up to the dimension-eight. Our results improve earlier LO results obtained from QSSR in the current literature. We obtain $M_{D^*D^*_0} = 5244(228)$ MeV which is heavier than the experimental candidates Y(4260); Y(4360); Y(4660) suggesting that they cannot be pure molecule states. We predict $M_{B^*B^*_0}= 11920(159)$ MeV to be tested in B-factory experiments. |
1501.03477 | Inar Timiryasov | A. Shkerin, I. Timiryasov | Lepton flavor violating baryon decays with a single generation | 5 pages | null | null | INR-TH/2015-004 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we study lepton flavor violating semileptonic decays of heavy
baryons in a framework of a model with large extra dimensions and a single
generation . Resulting branching ratios for these decays mediated by
Kaluza-Klein modes of photon and Z-boson are presented in a model-independent
form.
| [
{
"created": "Wed, 14 Jan 2015 20:32:42 GMT",
"version": "v1"
}
] | 2015-01-15 | [
[
"Shkerin",
"A.",
""
],
[
"Timiryasov",
"I.",
""
]
] | In this paper we study lepton flavor violating semileptonic decays of heavy baryons in a framework of a model with large extra dimensions and a single generation . Resulting branching ratios for these decays mediated by Kaluza-Klein modes of photon and Z-boson are presented in a model-independent form. |
hep-ph/0102024 | Gerasyuta | S.M. Gerasyuta, D.V. Ivanov | Relativistic quark model and scalar diquarks charge radii | 6 pages, LaTeX | null | null | null | hep-ph | null | In the framework of relativistic quark model the behaviour of electromagnetic
form factors of diquarks with $ J^{P} = 0^{+} $ at small and intermediate
momentum transfer are determined. The charge radii of nonstrange and strange
scalar diquarks are calculated.
| [
{
"created": "Fri, 2 Feb 2001 17:38:52 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Gerasyuta",
"S. M.",
""
],
[
"Ivanov",
"D. V.",
""
]
] | In the framework of relativistic quark model the behaviour of electromagnetic form factors of diquarks with $ J^{P} = 0^{+} $ at small and intermediate momentum transfer are determined. The charge radii of nonstrange and strange scalar diquarks are calculated. |
1603.07443 | Vasily Rodionov Nikolaevich | V.N. Rodionov | Non-Hermitian ${\cal PT}$-symmetric relativistic quantum theory in an
intensive magnetic field | 15 pages, 4 figures, Materials of The XVth conference on
Pseudo-Hermitian Hamiltonians in Quantum Physics that was held in Palermo
(Italy) | null | null | null | hep-ph astro-ph.HE hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop relativistic non-Hermitian quantum theory and its application to
neutrino physics in a strong magnetic field. It is well known, that one of the
fundamental postulates of quantum theory is the requirement of Hermiticity of
physical parameters. This condition not only guarantees the reality of the
eigenvalues of Hamiltonian operators, but also implies the preservation of the
probabilities of the considered quantum processes. However as it was shown
relatively recently (Bender, Boettcher 1998), Hermiticity is a sufficient but
it is not a necessary condition. It turned out that among non-Hermitian
Hamiltonians it is possible to allocate a number of such which have real energy
spectra and can ensure the development of systems over time with preserving
unitarity. This type of Hamiltonians includes so-called parity-time (${\cal
PT}$) symmetric models which is already used in various fields of modern
physics. The most developed in this respect are models, which used in the field
of ${\cal PT}$-symmetric optics, where for several years produced not only
theoretical but experimental studies.
| [
{
"created": "Thu, 24 Mar 2016 05:26:00 GMT",
"version": "v1"
}
] | 2016-03-25 | [
[
"Rodionov",
"V. N.",
""
]
] | We develop relativistic non-Hermitian quantum theory and its application to neutrino physics in a strong magnetic field. It is well known, that one of the fundamental postulates of quantum theory is the requirement of Hermiticity of physical parameters. This condition not only guarantees the reality of the eigenvalues of Hamiltonian operators, but also implies the preservation of the probabilities of the considered quantum processes. However as it was shown relatively recently (Bender, Boettcher 1998), Hermiticity is a sufficient but it is not a necessary condition. It turned out that among non-Hermitian Hamiltonians it is possible to allocate a number of such which have real energy spectra and can ensure the development of systems over time with preserving unitarity. This type of Hamiltonians includes so-called parity-time (${\cal PT}$) symmetric models which is already used in various fields of modern physics. The most developed in this respect are models, which used in the field of ${\cal PT}$-symmetric optics, where for several years produced not only theoretical but experimental studies. |
1803.10379 | G. Brooijmans | G. Brooijmans, M. Dolan, S. Gori, F. Maltoni, M. McCullough, P.
Musella, L. Perrozzi, P. Richardson, F. Riva, A. Angelescu, S. Banerjee, D.
Barducci, G. B\'elanger, B. Bhattacherjee, M. Borsato, A. Buckley, J. M.
Butterworth, G. Cacciapaglia, H. Cai, A. Carvalho, A. Chakraborty, G. Cottin,
A. Deandrea, J. de Blas, N. Desai, M. Endo, N. Ezroura, G. Facini, S. Fichet,
L. Finco, T. Flacke, B. Fuks, P. Gardner, S. Gascon-Shotkin, A. Goudelis, P.
Gras, D. Grellscheid, R. Gr\"ober, D. Guadagnoli, U. Haisch, J. Harz, J.
Heisig, B. Herrmann, J. Hewett, T. Hryn'ova, J. F. Kamenik, S. Kraml, U. Laa,
K. Lane, A. Lessa, S. Liebler, K. Lohwasser, D. M. Lombardo, D. Majumder, A.
Malinauskas, O. Mattelaer, K. Mimasu, G. Moreau, M. M\"uhlleitner, A. E.
Nelson, J. M. No, M. M. Nojiri, P. Pani, L. Panizzi, M. Park, G. Polesello,
W. Porod, L. Pritchett, H. B. Prosper, A. Pukhov, J. Quevillon, T. Rizzo, P.
Roloff, H. Rzehak, S. Sekmen, D. Sengupta, M. Spira, C. Vernieri, D. G. E.
Walker, D. Yallup, B. Zaldivar, S. Zhang and J. Zurita | Les Houches 2017: Physics at TeV Colliders New Physics Working Group
Report | Les Houches 2017 proceedings, 224 pages, many figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the activities of the `New Physics' working group for the `Physics
at TeV Colliders' workshop (Les Houches, France, 5--23 June, 2017). Our report
includes new physics studies connected with the Higgs boson and its properties,
direct search strategies, reinterpretation of the LHC results in the building
of viable models and new computational tool developments.
| [
{
"created": "Wed, 28 Mar 2018 01:40:18 GMT",
"version": "v1"
}
] | 2018-03-29 | [
[
"Brooijmans",
"G.",
""
],
[
"Dolan",
"M.",
""
],
[
"Gori",
"S.",
""
],
[
"Maltoni",
"F.",
""
],
[
"McCullough",
"M.",
""
],
[
"Musella",
"P.",
""
],
[
"Perrozzi",
"L.",
""
],
[
"Richardson",
"P.",
""
],
[
"Riva",
"F.",
""
],
[
"Angelescu",
"A.",
""
],
[
"Banerjee",
"S.",
""
],
[
"Barducci",
"D.",
""
],
[
"Bélanger",
"G.",
""
],
[
"Bhattacherjee",
"B.",
""
],
[
"Borsato",
"M.",
""
],
[
"Buckley",
"A.",
""
],
[
"Butterworth",
"J. M.",
""
],
[
"Cacciapaglia",
"G.",
""
],
[
"Cai",
"H.",
""
],
[
"Carvalho",
"A.",
""
],
[
"Chakraborty",
"A.",
""
],
[
"Cottin",
"G.",
""
],
[
"Deandrea",
"A.",
""
],
[
"de Blas",
"J.",
""
],
[
"Desai",
"N.",
""
],
[
"Endo",
"M.",
""
],
[
"Ezroura",
"N.",
""
],
[
"Facini",
"G.",
""
],
[
"Fichet",
"S.",
""
],
[
"Finco",
"L.",
""
],
[
"Flacke",
"T.",
""
],
[
"Fuks",
"B.",
""
],
[
"Gardner",
"P.",
""
],
[
"Gascon-Shotkin",
"S.",
""
],
[
"Goudelis",
"A.",
""
],
[
"Gras",
"P.",
""
],
[
"Grellscheid",
"D.",
""
],
[
"Gröber",
"R.",
""
],
[
"Guadagnoli",
"D.",
""
],
[
"Haisch",
"U.",
""
],
[
"Harz",
"J.",
""
],
[
"Heisig",
"J.",
""
],
[
"Herrmann",
"B.",
""
],
[
"Hewett",
"J.",
""
],
[
"Hryn'ova",
"T.",
""
],
[
"Kamenik",
"J. F.",
""
],
[
"Kraml",
"S.",
""
],
[
"Laa",
"U.",
""
],
[
"Lane",
"K.",
""
],
[
"Lessa",
"A.",
""
],
[
"Liebler",
"S.",
""
],
[
"Lohwasser",
"K.",
""
],
[
"Lombardo",
"D. M.",
""
],
[
"Majumder",
"D.",
""
],
[
"Malinauskas",
"A.",
""
],
[
"Mattelaer",
"O.",
""
],
[
"Mimasu",
"K.",
""
],
[
"Moreau",
"G.",
""
],
[
"Mühlleitner",
"M.",
""
],
[
"Nelson",
"A. E.",
""
],
[
"No",
"J. M.",
""
],
[
"Nojiri",
"M. M.",
""
],
[
"Pani",
"P.",
""
],
[
"Panizzi",
"L.",
""
],
[
"Park",
"M.",
""
],
[
"Polesello",
"G.",
""
],
[
"Porod",
"W.",
""
],
[
"Pritchett",
"L.",
""
],
[
"Prosper",
"H. B.",
""
],
[
"Pukhov",
"A.",
""
],
[
"Quevillon",
"J.",
""
],
[
"Rizzo",
"T.",
""
],
[
"Roloff",
"P.",
""
],
[
"Rzehak",
"H.",
""
],
[
"Sekmen",
"S.",
""
],
[
"Sengupta",
"D.",
""
],
[
"Spira",
"M.",
""
],
[
"Vernieri",
"C.",
""
],
[
"Walker",
"D. G. E.",
""
],
[
"Yallup",
"D.",
""
],
[
"Zaldivar",
"B.",
""
],
[
"Zhang",
"S.",
""
],
[
"Zurita",
"J.",
""
]
] | We present the activities of the `New Physics' working group for the `Physics at TeV Colliders' workshop (Les Houches, France, 5--23 June, 2017). Our report includes new physics studies connected with the Higgs boson and its properties, direct search strategies, reinterpretation of the LHC results in the building of viable models and new computational tool developments. |
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