id
stringlengths 9
14
| submitter
stringlengths 6
24
⌀ | authors
stringlengths 11
109
| title
stringlengths 28
127
| comments
stringlengths 5
164
⌀ | journal-ref
stringlengths 17
71
⌀ | doi
stringlengths 15
31
⌀ | report-no
stringlengths 9
48
⌀ | categories
stringlengths 5
44
| license
stringclasses 2
values | orig_abstract
stringlengths 102
1.67k
| versions
listlengths 1
5
| update_date
stringlengths 10
10
| authors_parsed
sequencelengths 1
7
| abstract
stringlengths 99
1.67k
|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/0402124
|
Emmanuel Lipmanov
|
E. M. Lipmanov
|
Small Q-D neutrino masses from a generic lepton mass hierarchy
|
8 pages, no figures. Revised version. Results unchanged
| null | null | null |
hep-ph
| null |
Exponential lepton mass ratios are studied in a low energy phenomenology. In
view of the known data, the mass patterns of the charged leptons and widely
discussed quasi-degenerate neutrinos are related to one another by two
different traits - opposite mass ratios with large versus small exponents, and
probably conformable mass-degeneracy-deviation hierarchies. The
solar-atmospheric hierarchy parameter should have a special physical meaning in
the Q-D neutrino scenario. A general generic hierarchy equation with two
opposite solutions respectively for the charged lepton and neutrino mass ratios
is considered. It determines a small upper bound on the Q-D neutrino mass
scale, with estimations: m = 0.30 eV at 90% C.L., and m = 0.18 eV at best-fit
mass-squared differences.
|
[
{
"created": "Wed, 11 Feb 2004 19:37:12 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Mar 2004 16:20:21 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Lipmanov",
"E. M.",
""
]
] |
Exponential lepton mass ratios are studied in a low energy phenomenology. In view of the known data, the mass patterns of the charged leptons and widely discussed quasi-degenerate neutrinos are related to one another by two different traits - opposite mass ratios with large versus small exponents, and probably conformable mass-degeneracy-deviation hierarchies. The solar-atmospheric hierarchy parameter should have a special physical meaning in the Q-D neutrino scenario. A general generic hierarchy equation with two opposite solutions respectively for the charged lepton and neutrino mass ratios is considered. It determines a small upper bound on the Q-D neutrino mass scale, with estimations: m = 0.30 eV at 90% C.L., and m = 0.18 eV at best-fit mass-squared differences.
|
hep-ph/0009284
|
Luca Silvestrini
|
L. Silvestrini
|
epsilon'/epsilon and Rare K Decays in the Standard Model and
Supersymmetry
|
6 pages, talk given at the 4th International Conference On Hyperons,
Charm And Beauty Hadrons, 27-30 June 2000, Valencia, Spain
|
Nucl.Phys.Proc.Suppl. 93 (2001) 247-252
|
10.1016/S0920-5632(00)01112-9
|
ROME1-1301/00
|
hep-ph
| null |
After briefly reviewing the status of epsilon'/epsilon in the Standard Model,
I discuss SUSY contributions to epsilon'/epsilon, K^+ to pi^+ nu bar nu, K_L to
pi^0 nu bar nu and K_L to pi^0 e^+ e^-. While in the simplest case of the MSSM
with Minimal Flavour Violation the main effect is a suppression of these
transitions with respect to the Standard Model, large enhancements are possible
in more general SUSY models, with interesting correlations among the different
processes.
|
[
{
"created": "Mon, 25 Sep 2000 12:33:31 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Silvestrini",
"L.",
""
]
] |
After briefly reviewing the status of epsilon'/epsilon in the Standard Model, I discuss SUSY contributions to epsilon'/epsilon, K^+ to pi^+ nu bar nu, K_L to pi^0 nu bar nu and K_L to pi^0 e^+ e^-. While in the simplest case of the MSSM with Minimal Flavour Violation the main effect is a suppression of these transitions with respect to the Standard Model, large enhancements are possible in more general SUSY models, with interesting correlations among the different processes.
|
hep-ph/0703107
|
Yukihiro Mimura
|
Ilia Gogoladze, Chin-Aik Lee, Yukihiro Mimura and Qaisar Shafi
|
Yukawa Couplings in a Model with Gauge, Higgs and Matter Unification
|
12 pages
|
Phys.Lett.B649:212-217,2007
|
10.1016/j.physletb.2007.03.042
|
MIFP-07-07
|
hep-ph
| null |
We discuss how unification of the gauge, Higgs and (three chiral family)
matter superfields can be realized from the compactification of a six
dimensional supersymmetric SU(8) gauge theory over the orbifold R^4 x T^2/Z_3.
The bulk gauge interaction includes Yukawa interactions to generate masses for
quarks and leptons after the electroweak symmetry is broken. The Yukawa
matrices in this case turn out to be antisymmetric, and thus not
phenomenologically viable. To overcome this we introduce brane fields which are
vector-like under the standard model gauge symmetry, and so do not alter the
number of chiral families. In such a setup, the observed fermion masses and
mixings can be realized by taking into account suppression effects from the
effective Wilson line couplings and large volume of the extra dimensions.
|
[
{
"created": "Fri, 9 Mar 2007 20:46:32 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Gogoladze",
"Ilia",
""
],
[
"Lee",
"Chin-Aik",
""
],
[
"Mimura",
"Yukihiro",
""
],
[
"Shafi",
"Qaisar",
""
]
] |
We discuss how unification of the gauge, Higgs and (three chiral family) matter superfields can be realized from the compactification of a six dimensional supersymmetric SU(8) gauge theory over the orbifold R^4 x T^2/Z_3. The bulk gauge interaction includes Yukawa interactions to generate masses for quarks and leptons after the electroweak symmetry is broken. The Yukawa matrices in this case turn out to be antisymmetric, and thus not phenomenologically viable. To overcome this we introduce brane fields which are vector-like under the standard model gauge symmetry, and so do not alter the number of chiral families. In such a setup, the observed fermion masses and mixings can be realized by taking into account suppression effects from the effective Wilson line couplings and large volume of the extra dimensions.
|
1402.0607
|
Thomas Rehagen
|
Thomas Rehagen and Graciela B. Gelmini
|
Effects of kination and scalar-tensor cosmologies on sterile neutrinos
|
16 pages, 11 figures; v2: section on general constraints on H added,
text and figures improved, 1 figure added, accepted for publication in JCAP
| null |
10.1088/1475-7516/2014/06/044
| null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the effects of kination and scalar-tensor pre-Big Bang
Nucleosynthesis cosmologies on the non-resonant production of sterile
neutrinos. We show that if the peak of the production rate of sterile neutrinos
occurs during the non-standard cosmological phase, the relic number density of
sterile neutrinos could be reduced with respect to the number expected in the
standard cosmology. Consequently, current bounds on active-sterile neutrino
mixing derived from the relic energy density of sterile neutrinos could be
greatly relaxed. In particular, we show that the sterile neutrinos which could
explain the anomalies found in short-baseline neutrino experiments are
compatible with recent joint Planck upper limits on their contribution to the
energy density of the Universe in a scalar-tensor or a low-reheating
temperature pre-Big Bang Nucleosynthesis cosmology.
|
[
{
"created": "Tue, 4 Feb 2014 03:37:08 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Jun 2014 18:03:56 GMT",
"version": "v2"
}
] |
2015-06-18
|
[
[
"Rehagen",
"Thomas",
""
],
[
"Gelmini",
"Graciela B.",
""
]
] |
We study the effects of kination and scalar-tensor pre-Big Bang Nucleosynthesis cosmologies on the non-resonant production of sterile neutrinos. We show that if the peak of the production rate of sterile neutrinos occurs during the non-standard cosmological phase, the relic number density of sterile neutrinos could be reduced with respect to the number expected in the standard cosmology. Consequently, current bounds on active-sterile neutrino mixing derived from the relic energy density of sterile neutrinos could be greatly relaxed. In particular, we show that the sterile neutrinos which could explain the anomalies found in short-baseline neutrino experiments are compatible with recent joint Planck upper limits on their contribution to the energy density of the Universe in a scalar-tensor or a low-reheating temperature pre-Big Bang Nucleosynthesis cosmology.
|
1803.06785
|
Xin-Nian Wang
|
Tan Luo (CCNU), Shanshan Cao (Wayne State Univ), Yayun He (CCNU and
LBNL) and Xin-Nian Wang (CCNU and LBNL)
|
Multiple jets and $\gamma$-jet correlation in high-energy heavy-ion
collisions
|
11 pages with 12 figures, revised version includes discussions on the
background subtraction and different definitions of jet profile
| null |
10.1016/j.physletb.2018.06.025
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
$\gamma$-jet production is considered one of the best probes of the hot
quark-gluon plasma in high-energy heavy-ion collisions since the direct
$\gamma$ can be used to gauge the initial energy and momentum of the associated
jet. This is investigated within the Linear Boltzmann Transport (LBT) model for
jet propagation and jet-induced medium excitation. With both parton energy loss
and medium response from jet-medium interaction included, LBT can describe
experimental data well on $\gamma$-jet correlation in Pb+Pb collisions at the
Large Hadron Collider. Multiple jets associated with direct $\gamma$ production
are found to contribute significantly to $\gamma$-jet correlation at small
$p_T^{\rm jet}<p_T^\gamma$ and large azimuthal angle relative to the opposite
direction of $\gamma$. Jet medium interaction not only suppresses the leading
jet at large $p_T^{\rm jet}$ but also sub-leading jets at large azimuthal
angle. This effectively leads to the narrowing of $\gamma$-jet correlation in
azimuthal angle instead of broadening due to jet-medium interaction. The
$\gamma$-jet profile on the other hand will be broadened due to jet-medium
interaction and jet-induced medium response. Energy flow measurements relative
to the direct photon is illustrated to reflect well the broadening and
jet-induced medium response.
|
[
{
"created": "Mon, 19 Mar 2018 02:27:03 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Apr 2018 09:51:13 GMT",
"version": "v2"
}
] |
2018-06-20
|
[
[
"Luo",
"Tan",
"",
"CCNU"
],
[
"Cao",
"Shanshan",
"",
"Wayne State Univ"
],
[
"He",
"Yayun",
"",
"CCNU and\n LBNL"
],
[
"Wang",
"Xin-Nian",
"",
"CCNU and LBNL"
]
] |
$\gamma$-jet production is considered one of the best probes of the hot quark-gluon plasma in high-energy heavy-ion collisions since the direct $\gamma$ can be used to gauge the initial energy and momentum of the associated jet. This is investigated within the Linear Boltzmann Transport (LBT) model for jet propagation and jet-induced medium excitation. With both parton energy loss and medium response from jet-medium interaction included, LBT can describe experimental data well on $\gamma$-jet correlation in Pb+Pb collisions at the Large Hadron Collider. Multiple jets associated with direct $\gamma$ production are found to contribute significantly to $\gamma$-jet correlation at small $p_T^{\rm jet}<p_T^\gamma$ and large azimuthal angle relative to the opposite direction of $\gamma$. Jet medium interaction not only suppresses the leading jet at large $p_T^{\rm jet}$ but also sub-leading jets at large azimuthal angle. This effectively leads to the narrowing of $\gamma$-jet correlation in azimuthal angle instead of broadening due to jet-medium interaction. The $\gamma$-jet profile on the other hand will be broadened due to jet-medium interaction and jet-induced medium response. Energy flow measurements relative to the direct photon is illustrated to reflect well the broadening and jet-induced medium response.
|
hep-ph/0304185
|
Taekoon Lee
|
Taekoon Lee
|
Heavy quark mass determination from the quarkonium ground state energy:
a pole mass approach
|
16 pages; published version
|
JHEP0310:044,2003
|
10.1088/1126-6708/2003/10/044
| null |
hep-ph
| null |
The heavy quark pole mass in perturbation theory suffers from a renormalon
caused, inherent uncertainty of $O(\Lambda_{\rm QCD})$. This fundamental
difficulty of determining the pole mass to an accuracy better than the inherent
uncertainty can be overcome by direct resummation of the first infrared
renormalon. We show how a properly defined pole mass as well as the $\bar {\rm
MS}$ mass for the top and bottom quarks can be determined accurately from the
$O(m\alpha_s^5)$ quarkonium ground state energy.
|
[
{
"created": "Sun, 20 Apr 2003 04:34:57 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Oct 2003 09:27:48 GMT",
"version": "v2"
},
{
"created": "Wed, 5 Nov 2003 06:15:56 GMT",
"version": "v3"
}
] |
2009-11-10
|
[
[
"Lee",
"Taekoon",
""
]
] |
The heavy quark pole mass in perturbation theory suffers from a renormalon caused, inherent uncertainty of $O(\Lambda_{\rm QCD})$. This fundamental difficulty of determining the pole mass to an accuracy better than the inherent uncertainty can be overcome by direct resummation of the first infrared renormalon. We show how a properly defined pole mass as well as the $\bar {\rm MS}$ mass for the top and bottom quarks can be determined accurately from the $O(m\alpha_s^5)$ quarkonium ground state energy.
|
1702.05239
|
Peter Hintz
|
Peter Hintz
|
Uniqueness of Kerr-Newman-de Sitter black holes with small angular
momenta
|
10 pages, 1 figure. v2 is the published version, with updated
bibliography
|
Ann. Henri Poincare, 19(2):607-617, 2018
|
10.1007/s00023-017-0633-7
| null |
gr-qc math.DG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show that a stationary solution of the Einstein-Maxwell equations which is
close to a non-degenerate Reissner-Nordstr\"om-de Sitter solution is in fact
equal to a slowly rotating Kerr-Newman-de Sitter solution. The proof uses the
non-linear stability of the Kerr-Newman-de Sitter family of black holes for
small angular momenta, recently established by the author, together with an
extension argument for Killing vector fields. Our black hole uniqueness result
only requires the solution to have high but finite regularity; in particular,
we do not make any analyticity assumptions.
|
[
{
"created": "Fri, 17 Feb 2017 07:02:54 GMT",
"version": "v1"
},
{
"created": "Wed, 27 May 2020 15:28:39 GMT",
"version": "v2"
}
] |
2020-05-28
|
[
[
"Hintz",
"Peter",
""
]
] |
We show that a stationary solution of the Einstein-Maxwell equations which is close to a non-degenerate Reissner-Nordstr\"om-de Sitter solution is in fact equal to a slowly rotating Kerr-Newman-de Sitter solution. The proof uses the non-linear stability of the Kerr-Newman-de Sitter family of black holes for small angular momenta, recently established by the author, together with an extension argument for Killing vector fields. Our black hole uniqueness result only requires the solution to have high but finite regularity; in particular, we do not make any analyticity assumptions.
|
2312.08045
|
Karim Thebault
|
Antonis Antoniou and Karim P. Y. Th\'ebault
|
Theories Without Models: Uncontrolled Idealizations in Particle Physics
| null | null | null | null |
hep-ph hep-th physics.hist-ph
|
http://creativecommons.org/licenses/by/4.0/
|
The perturbative treatment of realistic quantum field theories, such as
quantum electrodynamics, requires the use of mathematical idealizations in the
approximation series for scattering amplitudes. Such mathematical idealisations
are necessary to derive empirically relevant models from the theory.
Mathematical idealizations can be either controlled or uncontrolled, depending
on whether current scientific knowledge can explain whether the effects of the
idealization are negligible or not. Drawing upon negative formal results in
asymptotic analysis (failure of Borel summability) and renormalization group
theory (failure of asymptotic safety), we argue that the mathematical
idealizations applied in perturbative quantum electrodynamics should be
understood as uncontrolled. This, in turn, leads to the problematic conclusion
that such theories do not have theoretical models in the standard understanding
of this term. The existence of unquestionable empirically successful theories
without theoretical models has significant implications both for our
understanding of the theory-model relationship in physics and the concept of
empirical adequacy.
|
[
{
"created": "Wed, 13 Dec 2023 10:54:56 GMT",
"version": "v1"
}
] |
2023-12-14
|
[
[
"Antoniou",
"Antonis",
""
],
[
"Thébault",
"Karim P. Y.",
""
]
] |
The perturbative treatment of realistic quantum field theories, such as quantum electrodynamics, requires the use of mathematical idealizations in the approximation series for scattering amplitudes. Such mathematical idealisations are necessary to derive empirically relevant models from the theory. Mathematical idealizations can be either controlled or uncontrolled, depending on whether current scientific knowledge can explain whether the effects of the idealization are negligible or not. Drawing upon negative formal results in asymptotic analysis (failure of Borel summability) and renormalization group theory (failure of asymptotic safety), we argue that the mathematical idealizations applied in perturbative quantum electrodynamics should be understood as uncontrolled. This, in turn, leads to the problematic conclusion that such theories do not have theoretical models in the standard understanding of this term. The existence of unquestionable empirically successful theories without theoretical models has significant implications both for our understanding of the theory-model relationship in physics and the concept of empirical adequacy.
|
1811.12401
|
Michele Levi
|
Michele Levi
|
A public framework for Feynman calculations and post-Newtonian gravity
|
9 pages, 1 figure
|
Proceedings of the MG15 Meeting on General Relativity 2018 (2022)
990
|
10.1142/9789811258251_0137
| null |
gr-qc hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We report here on a line of work that has played a key role in formally
establishing and going beyond the state of the art in the effective field
theory (EFT) approach and in post-Newtonian (PN) gravity. We also outline here
how this comprehensive framework in fact forms the outset of a prospective rich
research program, building on the public Feynman and PN technology developed.
|
[
{
"created": "Thu, 29 Nov 2018 18:59:44 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Jan 2019 15:43:40 GMT",
"version": "v2"
}
] |
2022-07-15
|
[
[
"Levi",
"Michele",
""
]
] |
We report here on a line of work that has played a key role in formally establishing and going beyond the state of the art in the effective field theory (EFT) approach and in post-Newtonian (PN) gravity. We also outline here how this comprehensive framework in fact forms the outset of a prospective rich research program, building on the public Feynman and PN technology developed.
|
hep-ph/0206177
|
Aaron Pierce
|
Hitoshi Murayama and Aaron Pierce
|
Realistic Dirac Leptogenesis
|
4 pages, 1 figure. Uses RevTex. Reference Added. Minor changes in
wording
|
Phys.Rev.Lett.89:271601,2002
|
10.1103/PhysRevLett.89.271601
|
UCB-PTH-02/26, LBNL-50854
|
hep-ph
| null |
We present a model of leptogenesis that preserves lepton number. The model
maintains the important feature of more traditional leptogenesis scenarios: the
decaying particles that provide the CP violation necessary for baryogenesis
also provide the explanation for the smallness of the neutrino Yukawa
couplings. This model clearly demonstrates that, contrary to conventional
wisdom, neutrinos need not be Majorana in nature in order to help explain the
baryon asymmetry of the universe.
|
[
{
"created": "Wed, 19 Jun 2002 23:23:33 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Jul 2002 18:07:58 GMT",
"version": "v2"
}
] |
2009-09-29
|
[
[
"Murayama",
"Hitoshi",
""
],
[
"Pierce",
"Aaron",
""
]
] |
We present a model of leptogenesis that preserves lepton number. The model maintains the important feature of more traditional leptogenesis scenarios: the decaying particles that provide the CP violation necessary for baryogenesis also provide the explanation for the smallness of the neutrino Yukawa couplings. This model clearly demonstrates that, contrary to conventional wisdom, neutrinos need not be Majorana in nature in order to help explain the baryon asymmetry of the universe.
|
hep-ph/9703278
|
Konstantin Chetyrkin
|
K. G. Chetyrkin
|
Quark Mass Anomalous Dimension to alpha_s**4
|
7 pages, LaTeX; elsart.sty is used (included)
|
Phys.Lett. B404 (1997) 161-165
|
10.1016/S0370-2693(97)00535-2
|
MPI/PhT/96-019
|
hep-ph
| null |
We present the results of analytic calculation of the quark mass anomalous
dimension to alpha_s**4.
|
[
{
"created": "Sun, 9 Mar 1997 22:58:28 GMT",
"version": "v1"
}
] |
2009-10-30
|
[
[
"Chetyrkin",
"K. G.",
""
]
] |
We present the results of analytic calculation of the quark mass anomalous dimension to alpha_s**4.
|
hep-ph/9503493
|
German Valencia
|
G. Valencia (Iowa State University)
|
Experimental Signatures of a Parity Violating Anomalous Coupling $g_5^Z$
|
10 pages LaTeX, 2 postscript figures, uses epsf Invited talk at the
International Symposium on Vector Boson Self-Interactions, UCLA 1995
| null |
10.1063/1.49301
|
ISU-HET-95-2
|
hep-ph
| null |
I discuss the experimental signatures of a parity violating but CP conserving
interaction in the symmetry breaking sector of the electroweak theory.
|
[
{
"created": "Sat, 1 Apr 1995 22:09:34 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Valencia",
"G.",
"",
"Iowa State University"
]
] |
I discuss the experimental signatures of a parity violating but CP conserving interaction in the symmetry breaking sector of the electroweak theory.
|
1605.08976
|
Saheb Soroushfar
|
Saheb Soroushfar, Reza Saffari, Sobhan Kazempour, Saskia Grunau, Jutta
Kunz
|
Detailed study of geodesics in the Kerr-Newman-(A)dS spactime and the
rotating charged black hole spacetime in $f(R)$ gravity
|
35 pages,3 table,24 figures, Accepted for publication in Physical
Review D. arXiv admin note: text overlap with arXiv:1605.08975,
arXiv:1601.03143
|
Phys. Rev. D 94, 024052 (2016)
|
10.1103/PhysRevD.94.024052
| null |
gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We perform a detailed study of the geodesic equations in the spacetime of the
static and rotating charged black hole corresponding to the Kerr-Newman-(A)dS
spacetime. We derive the equations of motion for test particles and light rays
and present their solutions in terms of the Weierstrass $\wp$, $\zeta$ and
$\sigma$ functions as well as the Kleinian $\sigma$ function. With the help of
parametric diagrams and effective potentials we analyze the geodesic motion and
classify the possible orbit types. This spacetime is also a solution of $f(R)$
gravity with a constant curvature scalar.
|
[
{
"created": "Sun, 29 May 2016 08:11:58 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Jul 2016 10:49:04 GMT",
"version": "v2"
}
] |
2016-08-02
|
[
[
"Soroushfar",
"Saheb",
""
],
[
"Saffari",
"Reza",
""
],
[
"Kazempour",
"Sobhan",
""
],
[
"Grunau",
"Saskia",
""
],
[
"Kunz",
"Jutta",
""
]
] |
We perform a detailed study of the geodesic equations in the spacetime of the static and rotating charged black hole corresponding to the Kerr-Newman-(A)dS spacetime. We derive the equations of motion for test particles and light rays and present their solutions in terms of the Weierstrass $\wp$, $\zeta$ and $\sigma$ functions as well as the Kleinian $\sigma$ function. With the help of parametric diagrams and effective potentials we analyze the geodesic motion and classify the possible orbit types. This spacetime is also a solution of $f(R)$ gravity with a constant curvature scalar.
|
0909.2460
|
Bruce Mellado
|
T. Han and B. Mellado
|
Higgs Boson Searches and the Hbbar Coupling at the LHeC
|
9 pages, 7 figures
|
Phys.Rev.D82:016009,2010
|
10.1103/PhysRevD.82.016009
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Once the existence of the Higgs boson is established at the CERN Large Hadron
Collider (LHC), the focus will be shifted toward understanding its couplings to
other particles. A crucial aspect is the measurement of the bottom Yukawa
coupling, which is challenging at the LHC. In this paper we study the use of
forward jet tagging as a means to secure the observation and to significantly
improve the purity of the Higgs boson signal in the H to bbar decay mode from
deep inelastic electron-proton scattering at the LHC. We demonstrate that the
requirement of forward jet tagging in charged current events strongly enhances
the signal-to-background ratio. The impact of a veto on additional partons is
also discussed. Excellent response to hadronic shower and b-tagging
capabilities are pivotal detector performance aspects.
|
[
{
"created": "Mon, 14 Sep 2009 02:06:10 GMT",
"version": "v1"
}
] |
2014-11-20
|
[
[
"Han",
"T.",
""
],
[
"Mellado",
"B.",
""
]
] |
Once the existence of the Higgs boson is established at the CERN Large Hadron Collider (LHC), the focus will be shifted toward understanding its couplings to other particles. A crucial aspect is the measurement of the bottom Yukawa coupling, which is challenging at the LHC. In this paper we study the use of forward jet tagging as a means to secure the observation and to significantly improve the purity of the Higgs boson signal in the H to bbar decay mode from deep inelastic electron-proton scattering at the LHC. We demonstrate that the requirement of forward jet tagging in charged current events strongly enhances the signal-to-background ratio. The impact of a veto on additional partons is also discussed. Excellent response to hadronic shower and b-tagging capabilities are pivotal detector performance aspects.
|
hep-ph/9712420
|
Lucas Taylor
|
John Swain and Lucas Taylor
|
First determination of the quark mixing matrix element Vtb independent
of assumptions of unitarity
|
4 pages, 2 figures
|
Phys.Rev. D58 (1998) 093006
|
10.1103/PhysRevD.58.093006
| null |
hep-ph
| null |
We present a new method for the determination of the
Cabibbo-Kobayashi-Maskawa quark mixing matrix element $|V_{tb}|$ from
electroweak loop corrections, in particular those affecting the process $Z\to
b\bar{b}$. From a combined analysis of results from the LEP, SLC, Tevatron, and
neutrino scattering experiments we determine $|V_{tb}| = 0.77^{+0.18}_{-0.24}$.
This is the first determination of $|V_{tb}|$ which is independent of unitarity
assumptions.
|
[
{
"created": "Wed, 17 Dec 1997 16:13:07 GMT",
"version": "v1"
}
] |
2009-10-30
|
[
[
"Swain",
"John",
""
],
[
"Taylor",
"Lucas",
""
]
] |
We present a new method for the determination of the Cabibbo-Kobayashi-Maskawa quark mixing matrix element $|V_{tb}|$ from electroweak loop corrections, in particular those affecting the process $Z\to b\bar{b}$. From a combined analysis of results from the LEP, SLC, Tevatron, and neutrino scattering experiments we determine $|V_{tb}| = 0.77^{+0.18}_{-0.24}$. This is the first determination of $|V_{tb}|$ which is independent of unitarity assumptions.
|
hep-ph/0601169
|
Elzbieta Nowak-Kubat
|
Henryk Czyz, Elzbieta Nowak-Kubat
|
The reaction e+e- --> e+e-pi+pi- and the pion form factor measurements
via the radiative return method
| null |
Phys.Lett. B634 (2006) 493-497
|
10.1016/j.physletb.2006.02.024
| null |
hep-ph
| null |
The role of the reaction e+e- --> e+ e-pi+pi- in the pion form factor
measurements via radiative return method without photon tagging is studied in
detail. The analysis is based on the developed Monte Carlo program EKHARA,
which ingredients are also presented.
|
[
{
"created": "Fri, 20 Jan 2006 08:53:40 GMT",
"version": "v1"
}
] |
2009-11-11
|
[
[
"Czyz",
"Henryk",
""
],
[
"Nowak-Kubat",
"Elzbieta",
""
]
] |
The role of the reaction e+e- --> e+ e-pi+pi- in the pion form factor measurements via radiative return method without photon tagging is studied in detail. The analysis is based on the developed Monte Carlo program EKHARA, which ingredients are also presented.
|
1111.5643
|
Giovanni Amelino-Camelia
|
Giovanni Amelino-Camelia
|
Particle-dependent deformations of Lorentz symmetry
|
v2: added one more example of conservation law for interactions
involving particles with different relativistic properties
| null | null | null |
hep-ph gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
I here investigate what is arguably the most significant residual challenge
for the proposal of phenomenologically viable "DSR deformations" of
relativistic kinematics, which concerns the description of composite particles,
such as atoms. In some approaches to the formalization of possible scenarios
for DSR-deformation of Lorentz symmetry it emerges that composite particles
should have relativistic properties different from the ones of their
constituent "fundamental particles", but these previous results provided no
clue as to how the mismatch of relativistic properties could be consistently
implemented. I show that it is possible to implement a fully consistent
DSR-relativistic description of kinematics endowing different types of
particles with suitably different deformed-Lorentz-symmetry properties. I also
contemplate the possibility that some types of particles (or macroscopic
bodies) behave according to completely undeformed special relativity, which in
particular might apply to the DSR description of the macroscopic bodies that
constitute measuring devices ("observers"). The formalization is also
applicable to cases where different fundamental particles have different
relativistic properties, leading to a type of phenomenology which I illustrate
by considering possible applications to the ongoing analyses of the
"Lorentz-symmetry anomaly" that was recently tentatively reported by the OPERA
collaboration. Some of the new elements here introduced in the formulation of
relativistic kinematics appear to also provide the starting point for the
development of a correspondingly novel mathematical formulation of
spacetime-symmetry algebras.
|
[
{
"created": "Wed, 23 Nov 2011 22:42:19 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Dec 2011 17:11:21 GMT",
"version": "v2"
}
] |
2011-12-15
|
[
[
"Amelino-Camelia",
"Giovanni",
""
]
] |
I here investigate what is arguably the most significant residual challenge for the proposal of phenomenologically viable "DSR deformations" of relativistic kinematics, which concerns the description of composite particles, such as atoms. In some approaches to the formalization of possible scenarios for DSR-deformation of Lorentz symmetry it emerges that composite particles should have relativistic properties different from the ones of their constituent "fundamental particles", but these previous results provided no clue as to how the mismatch of relativistic properties could be consistently implemented. I show that it is possible to implement a fully consistent DSR-relativistic description of kinematics endowing different types of particles with suitably different deformed-Lorentz-symmetry properties. I also contemplate the possibility that some types of particles (or macroscopic bodies) behave according to completely undeformed special relativity, which in particular might apply to the DSR description of the macroscopic bodies that constitute measuring devices ("observers"). The formalization is also applicable to cases where different fundamental particles have different relativistic properties, leading to a type of phenomenology which I illustrate by considering possible applications to the ongoing analyses of the "Lorentz-symmetry anomaly" that was recently tentatively reported by the OPERA collaboration. Some of the new elements here introduced in the formulation of relativistic kinematics appear to also provide the starting point for the development of a correspondingly novel mathematical formulation of spacetime-symmetry algebras.
|
gr-qc/0303090
|
Kouji Nakamura
|
Kouji Nakamura
|
Gauge Invariant Variables in Two-Parameter Nonlinear Perturbations
|
33 pages, 1 figure, PTPTeX ver.0.8 (LateX2e), Accepted for
Publication to Progress of Theoretical Physics. Typos and trivial mistakes in
equations are corrected
|
Prog.Theor.Phys. 110 (2003) 723-755
|
10.1143/PTP.110.723
|
NAOJ-TH-Ap 2003, No.19
|
gr-qc astro-ph hep-ph hep-th math-ph math.MP
| null |
The procedure to find gauge invariant variables for two-parameter nonlinear
perturbations in general relativity is considered. For each order metric
perturbation, we define the variable which is defined by the appropriate
combination with lower order metric perturbations. Under the gauge
transformation, this variable is transformed in the manner similar to the gauge
transformation of the linear order metric perturbation. We confirm this up to
third order. This implies that gauge invariant variables for higher order
metric perturbations can be found by using a procedure similar to that for
linear order metric perturbations. We also derive gauge invariant combinations
for the perturbation of an arbitrary physical variable, other than the
spacetime metric, up to third order.
|
[
{
"created": "Mon, 24 Mar 2003 07:51:46 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Jun 2003 14:34:00 GMT",
"version": "v2"
},
{
"created": "Mon, 28 Jul 2003 21:09:49 GMT",
"version": "v3"
},
{
"created": "Mon, 29 Sep 2003 08:12:47 GMT",
"version": "v4"
}
] |
2009-11-10
|
[
[
"Nakamura",
"Kouji",
""
]
] |
The procedure to find gauge invariant variables for two-parameter nonlinear perturbations in general relativity is considered. For each order metric perturbation, we define the variable which is defined by the appropriate combination with lower order metric perturbations. Under the gauge transformation, this variable is transformed in the manner similar to the gauge transformation of the linear order metric perturbation. We confirm this up to third order. This implies that gauge invariant variables for higher order metric perturbations can be found by using a procedure similar to that for linear order metric perturbations. We also derive gauge invariant combinations for the perturbation of an arbitrary physical variable, other than the spacetime metric, up to third order.
|
1408.0763
|
Dorin Weissman
|
Jacob Sonnenschein and Dorin Weissman
|
A rotating string model versus baryon spectra
|
v2: typos corrected, references added, 41 pages; v3: added some
sentences to clarify the relation between our model and the holograhic
string, 42 pages
|
JHEP 1502 (2015) 147
|
10.1007/JHEP02(2015)147
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We continue our program of describing hadrons as rotating strings with
massive endpoints. In this paper we propose models of baryons and confront them
with the baryon Regge trajectories. We show that these are best fitted by a
model of a single string with a quark at one endpoint and a diquark at the
other. This model is preferred over the Y-shaped string model with a quark at
each endpoint. We show how the model follows from a stringy model of the
holographic baryon which includes a baryonic vertex connected with N_c strings
to flavor probe branes. From fitting to baryonic data we find that there is no
clear evidence for a non-zero baryonic vertex mass, but if there is such a mass
it should be located at one of the string endpoints. The available baryon
trajectories in the angular momentum plane (J,M^2), involving light, strange,
and charmed baryons, are rather well fitted when adding masses to the string
endpoints, with a single universal slope of 0.95 GeV^-2. Most of the results
for the quark masses are then found to be consistent with the results extracted
from the meson spectra in a preceding paper, where the value of the slope
emerging from the meson fits was found to be 0.90 GeV^-2. In the plane of
quantum radial excitations, (n,M^2), we also find a good agreement between the
meson and baryon slopes. The flavor structure of the diquark is examined, where
our interest lies in particular on baryons composed of more than one quark
heavier than the u and d quarks. For these baryons we present a method of
checking the holographic interpretation of our results.
|
[
{
"created": "Mon, 4 Aug 2014 18:43:08 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Oct 2014 12:42:27 GMT",
"version": "v2"
},
{
"created": "Thu, 1 Jan 2015 18:10:01 GMT",
"version": "v3"
}
] |
2015-03-03
|
[
[
"Sonnenschein",
"Jacob",
""
],
[
"Weissman",
"Dorin",
""
]
] |
We continue our program of describing hadrons as rotating strings with massive endpoints. In this paper we propose models of baryons and confront them with the baryon Regge trajectories. We show that these are best fitted by a model of a single string with a quark at one endpoint and a diquark at the other. This model is preferred over the Y-shaped string model with a quark at each endpoint. We show how the model follows from a stringy model of the holographic baryon which includes a baryonic vertex connected with N_c strings to flavor probe branes. From fitting to baryonic data we find that there is no clear evidence for a non-zero baryonic vertex mass, but if there is such a mass it should be located at one of the string endpoints. The available baryon trajectories in the angular momentum plane (J,M^2), involving light, strange, and charmed baryons, are rather well fitted when adding masses to the string endpoints, with a single universal slope of 0.95 GeV^-2. Most of the results for the quark masses are then found to be consistent with the results extracted from the meson spectra in a preceding paper, where the value of the slope emerging from the meson fits was found to be 0.90 GeV^-2. In the plane of quantum radial excitations, (n,M^2), we also find a good agreement between the meson and baryon slopes. The flavor structure of the diquark is examined, where our interest lies in particular on baryons composed of more than one quark heavier than the u and d quarks. For these baryons we present a method of checking the holographic interpretation of our results.
|
2104.09542
|
Parsa Hossein Ghorbani
|
Parsa Ghorbani
|
Vacuum Stability vs. Positivity in Real Singlet Scalar Extension of the
Standard Model
|
12 pages, 2 tables, 4 figures; references added
| null |
10.1016/j.nuclphysb.2021.115533
| null |
hep-ph hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
We assume a generic real singlet scalar extension of the Standard Model
living in the vacuum $(v,w)$ at the electroweak scale with $v=246$ GeV and $w$
being respectively the Higgs and the singlet scalar vacuum expectation values.
By requiring {\it absolute} vacuum stability for the vacuum $(v,w)$, the
positivity condition and the perturbativity up to the Planck scale, we show
that the viable space of parameters in the model is strongly constrained for
various singlet scalar vacuum expectation values $w=0.1, 1, 10, 100$ TeV. Also,
it turns out that the singlet scalar mass can be from a few GeV up to less than
TeV.
|
[
{
"created": "Mon, 19 Apr 2021 18:06:29 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Jun 2021 12:57:45 GMT",
"version": "v2"
}
] |
2021-09-22
|
[
[
"Ghorbani",
"Parsa",
""
]
] |
We assume a generic real singlet scalar extension of the Standard Model living in the vacuum $(v,w)$ at the electroweak scale with $v=246$ GeV and $w$ being respectively the Higgs and the singlet scalar vacuum expectation values. By requiring {\it absolute} vacuum stability for the vacuum $(v,w)$, the positivity condition and the perturbativity up to the Planck scale, we show that the viable space of parameters in the model is strongly constrained for various singlet scalar vacuum expectation values $w=0.1, 1, 10, 100$ TeV. Also, it turns out that the singlet scalar mass can be from a few GeV up to less than TeV.
|
1504.04268
|
Neda Sadooghi
|
N. Sadooghi and F. Taghinavaz
|
Magnetized plasminos in cold and hot QED plasmas
|
V1: 24 pages, 10 figures; V2: Typos corrected. Version accepted for
publication in PRD
|
Phys. Rev. D92, 025006 (2015)
|
10.1103/PhysRevD.92.025006
| null |
hep-ph hep-th nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The complete quasi-particle spectrum of a magnetized electromagnetic plasma
is systematically explored at zero and nonzero temperatures. To this purpose,
the general structure of the one-loop corrected propagator of magnetized
fermions is determined, and the dispersion relations arising from the pole of
this propagator are numerically solved. It turns out that in the lowest Landau
level, where only one spin direction is allowed, the spectrum consists of one
positively (negatively) charged fermionic mode with positive (negative) spin.
In contrast, in higher Landau levels, as an indirect consequence of the double
spin degeneracy of fermions, the spectrum consists of two massless collective
modes with left- and right-chiralities. The mechanism through which these new
collective excitations are created in a uniform magnetic field is similar to
the production mechanism of dynamical holes (plasminos) at finite temperature
and zero magnetic fields. Whereas cold magnetized plasminos appear for moderate
magnetic fields and for all positive momenta of propagating fermions, hot
magnetized plasminos appear only in the limit of weak magnetic fields and soft
momenta.
|
[
{
"created": "Thu, 16 Apr 2015 15:12:47 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Jan 2016 12:22:58 GMT",
"version": "v2"
}
] |
2016-01-20
|
[
[
"Sadooghi",
"N.",
""
],
[
"Taghinavaz",
"F.",
""
]
] |
The complete quasi-particle spectrum of a magnetized electromagnetic plasma is systematically explored at zero and nonzero temperatures. To this purpose, the general structure of the one-loop corrected propagator of magnetized fermions is determined, and the dispersion relations arising from the pole of this propagator are numerically solved. It turns out that in the lowest Landau level, where only one spin direction is allowed, the spectrum consists of one positively (negatively) charged fermionic mode with positive (negative) spin. In contrast, in higher Landau levels, as an indirect consequence of the double spin degeneracy of fermions, the spectrum consists of two massless collective modes with left- and right-chiralities. The mechanism through which these new collective excitations are created in a uniform magnetic field is similar to the production mechanism of dynamical holes (plasminos) at finite temperature and zero magnetic fields. Whereas cold magnetized plasminos appear for moderate magnetic fields and for all positive momenta of propagating fermions, hot magnetized plasminos appear only in the limit of weak magnetic fields and soft momenta.
|
hep-ph/0303126
|
Ernest Ma
|
Ernest Ma (UC Riverside)
|
Form Invariance of the Neutrino Mass Matrix
|
Version to appear in PRL
|
Phys.Rev.Lett. 90 (2003) 221802
|
10.1103/PhysRevLett.90.221802
| null |
hep-ph
| null |
Consider the most general $3 \times 3$ Majorana neutrino mass matrix $\cal
M$. Motivated by present neutrino-oscillation data, much theoretical effort is
directed at reducing it to a specific texture in terms of a small number of
parameters. This procedure is often {\it ad hoc}. I propose instead that for
any $\cal M$ one may choose, it should satisfy the condition $U {\cal M} U^T =
{\cal M}$, where $U \neq 1$ is a specific unitary matrix such that $U^N$
represents a well-defined discrete symmetry in the $\nu_{e,\mu,\tau}$ basis,
$N$ being a particular integer not necessarily equal to one. I illustrate this
idea with a number of examples, including the realistic case of an inverted
hierarchy of neutrino masses.
|
[
{
"created": "Fri, 14 Mar 2003 16:58:39 GMT",
"version": "v1"
},
{
"created": "Sat, 15 Mar 2003 16:43:24 GMT",
"version": "v2"
},
{
"created": "Thu, 1 May 2003 15:57:00 GMT",
"version": "v3"
}
] |
2009-11-10
|
[
[
"Ma",
"Ernest",
"",
"UC Riverside"
]
] |
Consider the most general $3 \times 3$ Majorana neutrino mass matrix $\cal M$. Motivated by present neutrino-oscillation data, much theoretical effort is directed at reducing it to a specific texture in terms of a small number of parameters. This procedure is often {\it ad hoc}. I propose instead that for any $\cal M$ one may choose, it should satisfy the condition $U {\cal M} U^T = {\cal M}$, where $U \neq 1$ is a specific unitary matrix such that $U^N$ represents a well-defined discrete symmetry in the $\nu_{e,\mu,\tau}$ basis, $N$ being a particular integer not necessarily equal to one. I illustrate this idea with a number of examples, including the realistic case of an inverted hierarchy of neutrino masses.
|
1410.1534
|
Sonia El Hedri
|
Kassahun Betre, Sonia El Hedri and Devin G. E. Walker
|
Perturbative Unitarity Constraints on the NMSSM Higgs Sector
|
50 pages, 20 figures
| null | null |
SLAC--PUB--16103
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We place perturbative unitarity constraints on both the dimensionful and
dimensionless parameters in the Next-to-Minimal Supersymmetric Standard Model
(NMSSM) Higgs Sector. These constraints, plus the requirement that the singlino
and/or Higgsino constitutes at least part of the observed dark matter relic
abundance, generate upper bounds on the Higgs, neutralino and chargino mass
spectrum. Requiring higher order corrections to be no more than 41% of the
tree-level value, we obtain an upper bound of 20 TeV for the heavy Higgses and
12 TeV for the charginos and neutralinos outside defined fine-tuned regions. If
the corrections are no more than 20% of the tree-level value, the bounds are 7
TeV for the heavy Higgses and 5 TeV for the charginos and neutralinos. In all,
by using the NMSSM as a template, we describe a method which replaces
naturalness arguments with more rigorous perturbative unitarity arguments to
get a better understanding of when new physics will appear.
|
[
{
"created": "Mon, 6 Oct 2014 20:00:04 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Oct 2014 16:52:22 GMT",
"version": "v2"
}
] |
2014-10-09
|
[
[
"Betre",
"Kassahun",
""
],
[
"Hedri",
"Sonia El",
""
],
[
"Walker",
"Devin G. E.",
""
]
] |
We place perturbative unitarity constraints on both the dimensionful and dimensionless parameters in the Next-to-Minimal Supersymmetric Standard Model (NMSSM) Higgs Sector. These constraints, plus the requirement that the singlino and/or Higgsino constitutes at least part of the observed dark matter relic abundance, generate upper bounds on the Higgs, neutralino and chargino mass spectrum. Requiring higher order corrections to be no more than 41% of the tree-level value, we obtain an upper bound of 20 TeV for the heavy Higgses and 12 TeV for the charginos and neutralinos outside defined fine-tuned regions. If the corrections are no more than 20% of the tree-level value, the bounds are 7 TeV for the heavy Higgses and 5 TeV for the charginos and neutralinos. In all, by using the NMSSM as a template, we describe a method which replaces naturalness arguments with more rigorous perturbative unitarity arguments to get a better understanding of when new physics will appear.
|
hep-ph/0009244
|
Junegone Chay
|
Junegone Chay, Chul Kim
|
Analysis of the QCD-improved factorization in B -> J/\psi K
|
Revised version- A major change in the organization of the paper. A
new numerical analysis and more references added. 13 pages, 1 figure
| null | null |
KUPT 2000-02
|
hep-ph
| null |
We consider the exclusive decay $B\to J/\psi K$ using the QCD-improved
factorization method in the heavy quark limit. It is shown that the decay
amplitude is factorizable in this limit and nonfactorizable contributions are
calculable from first principles in perturbation theory. Also the spectator
contributions at order $\alpha_s$ are finite and suppressed in the heavy quark
limit. We present the result at next-to-leading order in strong interaction,
and leading order in $1/m_b$ in the heavy quark limit.
|
[
{
"created": "Thu, 21 Sep 2000 04:31:44 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Nov 2000 04:42:35 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Chay",
"Junegone",
""
],
[
"Kim",
"Chul",
""
]
] |
We consider the exclusive decay $B\to J/\psi K$ using the QCD-improved factorization method in the heavy quark limit. It is shown that the decay amplitude is factorizable in this limit and nonfactorizable contributions are calculable from first principles in perturbation theory. Also the spectator contributions at order $\alpha_s$ are finite and suppressed in the heavy quark limit. We present the result at next-to-leading order in strong interaction, and leading order in $1/m_b$ in the heavy quark limit.
|
hep-ph/9511290
|
Takhmassib Aliev
|
T. M. Aliev, D. A. Demir, E. Iltan and N. K. Pak
|
Radiative $B^{*}\to B\gamma$ and $D^{*}\to D\gamma$ decays in light cone
QCD sum rules
|
13 pages, Latex, 3 figures
|
Phys.Rev. D54 (1996) 857-862
|
10.1103/PhysRevD.54.857
|
METU-HE-15/95
|
hep-ph
| null |
The radiative decays $ B^{*} (D^{*})\rightarrow B(D) \gamma$ are investigated
in the framework of light cone QCD sum rules. The transition amplitude and
decay rates are estimated.It is shown that our results on branching ratios of D
meson decays are in good agreement with the existing experimental data.
|
[
{
"created": "Fri, 10 Nov 1995 13:19:22 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Nov 1995 10:16:45 GMT",
"version": "v2"
}
] |
2009-10-28
|
[
[
"Aliev",
"T. M.",
""
],
[
"Demir",
"D. A.",
""
],
[
"Iltan",
"E.",
""
],
[
"Pak",
"N. K.",
""
]
] |
The radiative decays $ B^{*} (D^{*})\rightarrow B(D) \gamma$ are investigated in the framework of light cone QCD sum rules. The transition amplitude and decay rates are estimated.It is shown that our results on branching ratios of D meson decays are in good agreement with the existing experimental data.
|
hep-ph/9710404
|
Sarira Sahu
|
Subhendra Mohanty and Sarira Sahu
|
Neutrino helicity flip by Cerenkov emission and absorption of plasmons
in supernova
|
2 pages, latex, 2 figures
| null | null | null |
hep-ph
| null |
We show that in a supernova core the longitudinal photon (plasmon) has a
space-like dispersion and Cerenkov absorption and emission of such photons is
kinematically allowed. If the neutrino has a non-zero magnetic moment, then
helicity flipping Cerenkov absorption of a plasmon $\nu_L+\gamma\to\nu_R$ is
the most efficient cooling mechanism of the supernova core, and this allows us
to put a restrictive bound on the neutrino magnetic moment
$\mu_{\nu}~<~0.7\times 10^{-13}\mu_B$.
|
[
{
"created": "Mon, 20 Oct 1997 05:32:23 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Mohanty",
"Subhendra",
""
],
[
"Sahu",
"Sarira",
""
]
] |
We show that in a supernova core the longitudinal photon (plasmon) has a space-like dispersion and Cerenkov absorption and emission of such photons is kinematically allowed. If the neutrino has a non-zero magnetic moment, then helicity flipping Cerenkov absorption of a plasmon $\nu_L+\gamma\to\nu_R$ is the most efficient cooling mechanism of the supernova core, and this allows us to put a restrictive bound on the neutrino magnetic moment $\mu_{\nu}~<~0.7\times 10^{-13}\mu_B$.
|
hep-ph/0001116
|
Ling-Fong Li
|
Ling-Fong Li
|
Spontaneous Symmetry Breaking and Chiral Symmetry
|
Lecture Delivered at VII Mexico Workshop on Paritcles and Fields,
Merida, Yucatan Mexico, Nov 10-17,1999
|
AIP Conf.Proc.531:16-44,2000
|
10.1063/1.1315030
|
CMU-HEP00-01
|
hep-ph
| null |
In this introductory lecture, some basic features of the spontaneous symmetry
breaking are discussed. More specifically, $\sigma $-model, non-linear
realization, and some examples of spontaneous symmetry breaking in the
non-relativistic system are discussed in details. The approach here is more
pedagogical than rigorous and the purpose is to get some simple explanation of
some useful topics in this rather wide area. .
|
[
{
"created": "Thu, 13 Jan 2000 18:14:20 GMT",
"version": "v1"
}
] |
2010-12-13
|
[
[
"Li",
"Ling-Fong",
""
]
] |
In this introductory lecture, some basic features of the spontaneous symmetry breaking are discussed. More specifically, $\sigma $-model, non-linear realization, and some examples of spontaneous symmetry breaking in the non-relativistic system are discussed in details. The approach here is more pedagogical than rigorous and the purpose is to get some simple explanation of some useful topics in this rather wide area. .
|
gr-qc/9211014
|
Peter Peldan
|
Peter Peldan
|
Unification of Gravity and Yang-Mills Theory in (2+1)-Dimensions
|
22pages
|
Nucl.Phys. B395 (1993) 239-262
|
10.1016/0550-3213(93)90216-C
|
ITP 92-49
|
gr-qc hep-th
| null |
A gauge and diffeomorphism invariant theory in (2+1)-dimensions is presented
in both first and second order Lagrangian form as well as in a Hamiltonian
form. For gauge group $SO(1,2)$, the theory is shown to describe ordinary
Einstein gravity with a cosmological constant. With gauge group
$G^{tot}=SO(1,2)\otimes G^{YM}$, it is shown that the equations of motion for
the $G^{YM}$ fields are the Yang-Mills equations. It is also shown that for
weak $G^{YM}$ Yang-Mills fields, this theory agrees with the conventional
Einstein-Yang-Mills theory to lowest order in Yang-Mills fields. Explicit
static and rotation symmetric solutions to the Einstein-Maxwell theory are
studied both for the conventional coupling and for this unified theory. In the
electric solution to the unified theory, point charges are not allowed, the
charges must have spatial extensions.
|
[
{
"created": "Tue, 10 Nov 1992 12:48:16 GMT",
"version": "v1"
}
] |
2009-10-22
|
[
[
"Peldan",
"Peter",
""
]
] |
A gauge and diffeomorphism invariant theory in (2+1)-dimensions is presented in both first and second order Lagrangian form as well as in a Hamiltonian form. For gauge group $SO(1,2)$, the theory is shown to describe ordinary Einstein gravity with a cosmological constant. With gauge group $G^{tot}=SO(1,2)\otimes G^{YM}$, it is shown that the equations of motion for the $G^{YM}$ fields are the Yang-Mills equations. It is also shown that for weak $G^{YM}$ Yang-Mills fields, this theory agrees with the conventional Einstein-Yang-Mills theory to lowest order in Yang-Mills fields. Explicit static and rotation symmetric solutions to the Einstein-Maxwell theory are studied both for the conventional coupling and for this unified theory. In the electric solution to the unified theory, point charges are not allowed, the charges must have spatial extensions.
|
1908.05295
|
Peter Stoffer
|
Wouter Dekens, Peter Stoffer
|
Low-energy effective field theory below the electroweak scale: matching
at one loop
|
66 pages, 7 tables, 754 diagrams; includes finite shifts due to
tree-level evanescents
|
JHEP 1910 (2019) 197
|
10.1007/JHEP10(2019)197
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We compute the one-loop matching between the Standard Model Effective Field
Theory and the low-energy effective field theory below the electroweak scale,
where the heavy gauge bosons, the Higgs particle, and the top quark are
integrated out. The complete set of matching equations is derived including
effects up to dimension six in the power counting of both theories. We present
the results for general flavor structures and include both the $CP$-even and
$CP$-odd sectors. The matching equations express the masses, gauge couplings,
as well as the coefficients of dipole, three-gluon, and four-fermion operators
in the low-energy theory in terms of the parameters of the Standard Model
Effective Field Theory. Using momentum insertion, we also obtain the matching
for the $CP$-violating theta angles. Our results provide an ingredient for a
model-independent analysis of constraints on physics beyond the Standard Model.
They can be used for fixed-order calculations at one-loop accuracy and
represent a first step towards a systematic next-to-leading-log analysis.
|
[
{
"created": "Wed, 14 Aug 2019 18:20:31 GMT",
"version": "v1"
},
{
"created": "Sun, 27 Oct 2019 18:41:56 GMT",
"version": "v2"
},
{
"created": "Fri, 18 Nov 2022 17:51:02 GMT",
"version": "v3"
}
] |
2022-11-21
|
[
[
"Dekens",
"Wouter",
""
],
[
"Stoffer",
"Peter",
""
]
] |
We compute the one-loop matching between the Standard Model Effective Field Theory and the low-energy effective field theory below the electroweak scale, where the heavy gauge bosons, the Higgs particle, and the top quark are integrated out. The complete set of matching equations is derived including effects up to dimension six in the power counting of both theories. We present the results for general flavor structures and include both the $CP$-even and $CP$-odd sectors. The matching equations express the masses, gauge couplings, as well as the coefficients of dipole, three-gluon, and four-fermion operators in the low-energy theory in terms of the parameters of the Standard Model Effective Field Theory. Using momentum insertion, we also obtain the matching for the $CP$-violating theta angles. Our results provide an ingredient for a model-independent analysis of constraints on physics beyond the Standard Model. They can be used for fixed-order calculations at one-loop accuracy and represent a first step towards a systematic next-to-leading-log analysis.
|
gr-qc/9902037
|
Jacek Wisniewski
|
Jerzy Lewandowski and Jacek Wisniewski
|
Degenerate Sectors of the Ashtekar Gravity
|
19 pages, latex
|
Class.Quant.Grav. 16 (1999) 3057-3069
|
10.1088/0264-9381/16/10/303
| null |
gr-qc
| null |
This work completes the task of solving locally the Einstein-Ashtekar
equations for degenerate data. The two remaining degenerate sectors of the
classical 3+1 dimensional theory are considered. First, with all densitized
triad vectors linearly dependent and second, with only two independent ones. It
is shown how to solve the Einstein-Ashtekar equations completely by suitable
gauge fixing and choice of coordinates. Remarkably, the Hamiltonian weakly
Poisson commutes with the conditions defining the sectors. The summary of
degenerate solutions is given in the Appendix.
|
[
{
"created": "Thu, 11 Feb 1999 19:37:39 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Lewandowski",
"Jerzy",
""
],
[
"Wisniewski",
"Jacek",
""
]
] |
This work completes the task of solving locally the Einstein-Ashtekar equations for degenerate data. The two remaining degenerate sectors of the classical 3+1 dimensional theory are considered. First, with all densitized triad vectors linearly dependent and second, with only two independent ones. It is shown how to solve the Einstein-Ashtekar equations completely by suitable gauge fixing and choice of coordinates. Remarkably, the Hamiltonian weakly Poisson commutes with the conditions defining the sectors. The summary of degenerate solutions is given in the Appendix.
|
0704.2045
|
Chris Quigg
|
Chris Quigg
|
Higgs Bosons, Electroweak Symmetry Breaking, and the Physics of the
Large Hadron Collider
|
15 pages, 6 figures, uses Contemporary Physics macros (included)
|
Contemp.Phys.48:1-11,2007
|
10.1080/00107510701292187
|
FERMILAB-PUB-07/002-T
|
hep-ph hep-ex
| null |
The Large Hadron Collider, a 7 + 7 TeV proton-proton collider under
construction at CERN (the European Laboratory for Particle Physics in Geneva),
will take experiments squarely into a new energy domain where mysteries of the
electroweak interaction will be unveiled. What marks the 1-TeV scale as an
important target? Why is understanding how the electroweak symmetry is hidden
important to our conception of the world around us? What expectations do we
have for the agent that hides the electroweak symmetry? Why do particle
physicists anticipate a great harvest of discoveries within reach of the LHC?
|
[
{
"created": "Mon, 16 Apr 2007 16:26:07 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Quigg",
"Chris",
""
]
] |
The Large Hadron Collider, a 7 + 7 TeV proton-proton collider under construction at CERN (the European Laboratory for Particle Physics in Geneva), will take experiments squarely into a new energy domain where mysteries of the electroweak interaction will be unveiled. What marks the 1-TeV scale as an important target? Why is understanding how the electroweak symmetry is hidden important to our conception of the world around us? What expectations do we have for the agent that hides the electroweak symmetry? Why do particle physicists anticipate a great harvest of discoveries within reach of the LHC?
|
2401.07180
|
Aiichi Iwazaki
|
Aiichi Iwazaki
|
Axion Detection with Quantum Hall Effect
|
Updated, 17 pages, 8 figures, To be published in PTEP
| null | null |
Nisho-1-2024
|
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
Plateau-plateau transition in integer quantum Hall effect is a phase
transition between metal and insulator. The behavior how the width $\Delta B$
of the transition changes with temperature and frequency of radiations imposed
has been explored extensively. It decreases with the decrease of temperature
and frequency, but saturates at critical temperature or frequency. We have
recently discussed the effect of axion dark matter on the saturation. The axion
generates radiations under strong magnetic field in the experiment of quantum
Hall effect. The radiations play a similar role to the one of radiations
imposed externally. In this paper we discuss in detail how the width behaves in
temperature and frequency under the effect of axion dark matter. We show that
the axion effect can be observable in low temperature roughly below $100$mK.
According to our detailed analysis of the saturation, we find that critical
frequency of saturation observed in previous experiment strongly suggests axion
mass $m_a=(0.95\sim 0.99)\times 10^{-5}$eV.
|
[
{
"created": "Sun, 14 Jan 2024 00:40:24 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Jan 2024 00:15:35 GMT",
"version": "v2"
},
{
"created": "Tue, 14 May 2024 11:30:06 GMT",
"version": "v3"
}
] |
2024-05-15
|
[
[
"Iwazaki",
"Aiichi",
""
]
] |
Plateau-plateau transition in integer quantum Hall effect is a phase transition between metal and insulator. The behavior how the width $\Delta B$ of the transition changes with temperature and frequency of radiations imposed has been explored extensively. It decreases with the decrease of temperature and frequency, but saturates at critical temperature or frequency. We have recently discussed the effect of axion dark matter on the saturation. The axion generates radiations under strong magnetic field in the experiment of quantum Hall effect. The radiations play a similar role to the one of radiations imposed externally. In this paper we discuss in detail how the width behaves in temperature and frequency under the effect of axion dark matter. We show that the axion effect can be observable in low temperature roughly below $100$mK. According to our detailed analysis of the saturation, we find that critical frequency of saturation observed in previous experiment strongly suggests axion mass $m_a=(0.95\sim 0.99)\times 10^{-5}$eV.
|
1505.06006
|
Lei Wu
|
Ken-ichi Hikasa, Jinmian Li, Lei Wu and Jin Min Yang
|
Single top squark production as a probe of natural supersymmetry at the
LHC
|
6 pages, 4 figures, References and discussion added, accepted by
Phys. Rev. D
|
Phys. Rev. D 93, 035003 (2016)
|
10.1103/PhysRevD.93.035003
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Light top squarks (stops) and light higgsinos are the key features of natural
SUSY, where the higgsinos $\tilde{\chi}^{\pm}_{1}$ and $\tilde{\chi}^0_{1,2}$
are nearly degenerate and act as the missing transverse energy ($E^{miss}_T$)
at the LHC. Besides the strong production, the stop can be produced via the
electroweak interaction. The determination of the electroweak properties of the
stop is an essential task for the LHC and future colliders. So in this paper,
we investigate the single stop ($\tilde{t}_1$) production $pp \to \tilde{t}_1+
E^{miss}_T$ in the natural SUSY at the LHC, which gives the monotop signature
$t+ E^{miss}_T$ from $\tilde{t}_1\to t \tilde{\chi}^0_{1,2}$ or the monobottom
signature $b+ E^{miss}_T$ from $\tilde{t}_1 \to b \tilde{\chi}^+_{1}$. We
perform Monte Carlo simulations for these signatures and obtain the results:
(1) The signal $b+ E^{miss}_T$ has a better sensitivity than $t+ E^{miss}_T$
for probing natural SUSY; (2) The parameter region with a higgsino mass 100
GeV$\lesssim \mu \lesssim$ 225 GeV and stop mass $m_{\tilde{t}_1} \lesssim$ 620
GeV, can be probed through the single stop production with $S/\sqrt{B} > 3$ and
$4\% \lesssim S/B \lesssim19\%$ at 14 TeV HL-LHC with an integrated luminosity
of 3000 fb$^{-1}$.
|
[
{
"created": "Fri, 22 May 2015 09:34:09 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Jan 2016 03:51:40 GMT",
"version": "v2"
}
] |
2016-02-10
|
[
[
"Hikasa",
"Ken-ichi",
""
],
[
"Li",
"Jinmian",
""
],
[
"Wu",
"Lei",
""
],
[
"Yang",
"Jin Min",
""
]
] |
Light top squarks (stops) and light higgsinos are the key features of natural SUSY, where the higgsinos $\tilde{\chi}^{\pm}_{1}$ and $\tilde{\chi}^0_{1,2}$ are nearly degenerate and act as the missing transverse energy ($E^{miss}_T$) at the LHC. Besides the strong production, the stop can be produced via the electroweak interaction. The determination of the electroweak properties of the stop is an essential task for the LHC and future colliders. So in this paper, we investigate the single stop ($\tilde{t}_1$) production $pp \to \tilde{t}_1+ E^{miss}_T$ in the natural SUSY at the LHC, which gives the monotop signature $t+ E^{miss}_T$ from $\tilde{t}_1\to t \tilde{\chi}^0_{1,2}$ or the monobottom signature $b+ E^{miss}_T$ from $\tilde{t}_1 \to b \tilde{\chi}^+_{1}$. We perform Monte Carlo simulations for these signatures and obtain the results: (1) The signal $b+ E^{miss}_T$ has a better sensitivity than $t+ E^{miss}_T$ for probing natural SUSY; (2) The parameter region with a higgsino mass 100 GeV$\lesssim \mu \lesssim$ 225 GeV and stop mass $m_{\tilde{t}_1} \lesssim$ 620 GeV, can be probed through the single stop production with $S/\sqrt{B} > 3$ and $4\% \lesssim S/B \lesssim19\%$ at 14 TeV HL-LHC with an integrated luminosity of 3000 fb$^{-1}$.
|
gr-qc/0011033
|
Andrzej Krolak
|
Robert Budzynski, Witold Kondracki, and Andrzej Krolak
|
New properties of Cauchy and event horizons
|
11 pages, Talk at 2nd World Congress on Non-linear Analysis (July
2000, Catania, Italy)
| null | null | null |
gr-qc
| null |
We present several recent results concerning Cauchy and event horizons. In
the first part of the paper we review the differentiablity properties of the
Cauchy and the event horizons. In the second part we discuss compact Cauchy
horizons and summarize their main properties.
|
[
{
"created": "Wed, 8 Nov 2000 10:09:04 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Budzynski",
"Robert",
""
],
[
"Kondracki",
"Witold",
""
],
[
"Krolak",
"Andrzej",
""
]
] |
We present several recent results concerning Cauchy and event horizons. In the first part of the paper we review the differentiablity properties of the Cauchy and the event horizons. In the second part we discuss compact Cauchy horizons and summarize their main properties.
|
2405.05269
|
Abdelrahman Yasser
|
Kimet Jusufi, Ahmed Farag Ali, Abdelrahman Yasser, Nader Inan,
A.Y.Ellithi
|
Modified gravity/entropic gravity correspondence due to graviton mass
|
Accepted by Annals of Physics
| null |
10.1016/j.aop.2024.169717
| null |
gr-qc hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Some time ago, it has been suggested that gravitons can acquire mass in the
process of spontaneous symmetry breaking of diffeomorphisms through the
condensation of scalar fields [Chamseddine and Mukhanov, JHEP, 2010]. Taking
this possibility into account, in the present paper, first we show how the
graviton mass intricately reshapes the gravitational potential akin to a
Yukawa-like potential at large distances. Notably, this long-range force
modifies the Newton's law in large distances and might explain the phenomena of
dark matter. The most important finding in the present paper is the derivation
of a modified Newtons law of gravity by modifying the Verlindes entropic force
relation due to the graviton contribution. The graviton contribution to the
entropy basically measures the correlation of graviton and matter fields which
then reproduces the Bekenstein-Hawking entropy at the horizon. This result
shows the dual description of gravity: in the language of quantum information
and entropy the gravity can be viewed as an entropic force, however in terms of
particles and fields, it can be viewed as a longe range force. Further we have
recovered the corrected Einstein field equations as well as the $\Lambda$CDM
where dark matter emerges as an apparent effect.
|
[
{
"created": "Thu, 25 Apr 2024 16:28:43 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Jun 2024 22:12:12 GMT",
"version": "v2"
},
{
"created": "Fri, 12 Jul 2024 21:44:56 GMT",
"version": "v3"
}
] |
2024-07-16
|
[
[
"Jusufi",
"Kimet",
""
],
[
"Ali",
"Ahmed Farag",
""
],
[
"Yasser",
"Abdelrahman",
""
],
[
"Inan",
"Nader",
""
],
[
"Ellithi",
"A. Y.",
""
]
] |
Some time ago, it has been suggested that gravitons can acquire mass in the process of spontaneous symmetry breaking of diffeomorphisms through the condensation of scalar fields [Chamseddine and Mukhanov, JHEP, 2010]. Taking this possibility into account, in the present paper, first we show how the graviton mass intricately reshapes the gravitational potential akin to a Yukawa-like potential at large distances. Notably, this long-range force modifies the Newton's law in large distances and might explain the phenomena of dark matter. The most important finding in the present paper is the derivation of a modified Newtons law of gravity by modifying the Verlindes entropic force relation due to the graviton contribution. The graviton contribution to the entropy basically measures the correlation of graviton and matter fields which then reproduces the Bekenstein-Hawking entropy at the horizon. This result shows the dual description of gravity: in the language of quantum information and entropy the gravity can be viewed as an entropic force, however in terms of particles and fields, it can be viewed as a longe range force. Further we have recovered the corrected Einstein field equations as well as the $\Lambda$CDM where dark matter emerges as an apparent effect.
|
1906.12008
|
Daijiro Suematsu
|
Daijiro Suematsu
|
Low scale leptogenesis in a hybrid model of the scotogenic type I and
III seesaw
|
19 pages, 5 figures, several clarifications, added some references, a
version accepted for publication
|
Phys. Rev. D 100, 055008 (2019)
|
10.1103/PhysRevD.100.055008
|
KANAZAWA-19-04
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The scotogenic type I and type III seesaw models are good candidates to
explain the existence of neutrino masses and dark matter simultaneously.
However, since triplet fermions have SU(2) gauge interaction, they cannot be
out of equilibrium before the electroweak symmetry breaking. Thus, leptogenesis
seems to be difficult within a framework of the pure type III seesaw model.
Some extension seems to be required to solve this fault. A model extended by
introducing a singlet fermion could be such a simple example. If the singlet
fermion is in the thermal equilibrium even for its extremely small neutrino
Yukawa coupling, leptogenesis could be shown to occur successfully for a rather
low mass of the singlet fermion. The required mass could be lowered to
$10^4$~GeV.
|
[
{
"created": "Fri, 28 Jun 2019 01:19:11 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Aug 2019 00:19:29 GMT",
"version": "v2"
}
] |
2019-09-18
|
[
[
"Suematsu",
"Daijiro",
""
]
] |
The scotogenic type I and type III seesaw models are good candidates to explain the existence of neutrino masses and dark matter simultaneously. However, since triplet fermions have SU(2) gauge interaction, they cannot be out of equilibrium before the electroweak symmetry breaking. Thus, leptogenesis seems to be difficult within a framework of the pure type III seesaw model. Some extension seems to be required to solve this fault. A model extended by introducing a singlet fermion could be such a simple example. If the singlet fermion is in the thermal equilibrium even for its extremely small neutrino Yukawa coupling, leptogenesis could be shown to occur successfully for a rather low mass of the singlet fermion. The required mass could be lowered to $10^4$~GeV.
|
2106.07028
|
Partha Nandi
|
Partha Nandi, Partha Ghose
|
A Conformally Invariant Unified Theory of Maxwell Fields and Linearized
Gravity as Emergent Fields
| null | null | null | null |
gr-qc hep-th quant-ph
|
http://creativecommons.org/licenses/by/4.0/
|
A Lorentz and conformally invariant `Schr\"{o}dinger-like' equation for a
massless complex scalar function $\psi$ is derived from an invariant action,
and it is shown how the same $\psi$ can be used to calculate both the
gravitational field $h_{\mu\nu}$ of linearized Einstein gravity in the TT gauge
and the electromagnetic field $F_{\mu\nu}$ in the Lorenz gauge, and that the
main difference between classical and quantum aspects of such fields lies in a
certain condition that the underlying scalar wave must satisfy to keep it
nondispersive. It is also shown how the existence of gravitons can be inferred
from the state-dependent quantum noise they create in a model detector.
|
[
{
"created": "Sun, 13 Jun 2021 15:37:13 GMT",
"version": "v1"
}
] |
2021-06-15
|
[
[
"Nandi",
"Partha",
""
],
[
"Ghose",
"Partha",
""
]
] |
A Lorentz and conformally invariant `Schr\"{o}dinger-like' equation for a massless complex scalar function $\psi$ is derived from an invariant action, and it is shown how the same $\psi$ can be used to calculate both the gravitational field $h_{\mu\nu}$ of linearized Einstein gravity in the TT gauge and the electromagnetic field $F_{\mu\nu}$ in the Lorenz gauge, and that the main difference between classical and quantum aspects of such fields lies in a certain condition that the underlying scalar wave must satisfy to keep it nondispersive. It is also shown how the existence of gravitons can be inferred from the state-dependent quantum noise they create in a model detector.
|
1006.3284
|
Vladimir Bytev
|
A. I. Ahmadov, V. V. Bytev, E. A. Kuraev, E. Tomasi-Gustafsson
|
Radiative proton-antiproton annihilation to a lepton pair
|
2 figures
|
Phys.Rev.D82:094016,2010
|
10.1103/PhysRevD.82.094016
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The annihilation of proton and antiproton to electron-positron pair,
including radiative corrections due to the emission of virtual and real photons
is considered. The results are generalized to leading and next-to leading
approximations. The relevant distributions are derived and numerical
applications are given in the kinematical range accessible to the PANDA
experiment at the FAIR facility.
|
[
{
"created": "Wed, 16 Jun 2010 17:56:30 GMT",
"version": "v1"
}
] |
2010-12-09
|
[
[
"Ahmadov",
"A. I.",
""
],
[
"Bytev",
"V. V.",
""
],
[
"Kuraev",
"E. A.",
""
],
[
"Tomasi-Gustafsson",
"E.",
""
]
] |
The annihilation of proton and antiproton to electron-positron pair, including radiative corrections due to the emission of virtual and real photons is considered. The results are generalized to leading and next-to leading approximations. The relevant distributions are derived and numerical applications are given in the kinematical range accessible to the PANDA experiment at the FAIR facility.
|
0806.1375
|
Bernard Pire
|
M. El Beiyad, B. Pire, L. Szymanowski, S. Wallon
|
Two Photon Distribution Amplitudes
|
to be published in the proceedings of the workshop HLPW08, Spa, March
6-8, 2008, AIP conference proceedings series
|
AIPConf.Proc.1038:305-310,2008
|
10.1063/1.2987183
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The factorization of the amplitude of the process gamma* gamma -> gamma gamma
in the low energy and high photon virtuality region is demonstrated at the Born
order and in the leading logarithmic approximation. The leading order two
photon (generalized) distribution amplitudes exhibit a characteristic ln Q2
behaviour and obey new inhomogeneous evolution equations.
|
[
{
"created": "Mon, 9 Jun 2008 06:48:14 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Beiyad",
"M. El",
""
],
[
"Pire",
"B.",
""
],
[
"Szymanowski",
"L.",
""
],
[
"Wallon",
"S.",
""
]
] |
The factorization of the amplitude of the process gamma* gamma -> gamma gamma in the low energy and high photon virtuality region is demonstrated at the Born order and in the leading logarithmic approximation. The leading order two photon (generalized) distribution amplitudes exhibit a characteristic ln Q2 behaviour and obey new inhomogeneous evolution equations.
|
2104.02136
|
Gregory J. Galloway
|
Gregory J. Galloway and Eric Ling
|
Remarks on the existence of CMC Cauchy surfaces
|
13 pages; v2: minor corrections/clarifications. To appear in the
Proceedings of the X International Meeting on Lorentzian Geometry
| null | null | null |
gr-qc math.DG
|
http://creativecommons.org/licenses/by/4.0/
|
As is well known, constant mean curvature (CMC) spacelike hypersurfaces play
an important role in solving the Einstein equations, both in solving the
contraints and the evolution equations. In this paper we review the CMC
existence result obtained by the authors in [10] and consider some new
existence results motivated by a conjecture of Dilts and Holst [8]. We also
address some issues concerning the conformal structure of cosmological
spacetimes.
|
[
{
"created": "Mon, 5 Apr 2021 20:22:47 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Nov 2021 20:34:03 GMT",
"version": "v2"
}
] |
2021-11-12
|
[
[
"Galloway",
"Gregory J.",
""
],
[
"Ling",
"Eric",
""
]
] |
As is well known, constant mean curvature (CMC) spacelike hypersurfaces play an important role in solving the Einstein equations, both in solving the contraints and the evolution equations. In this paper we review the CMC existence result obtained by the authors in [10] and consider some new existence results motivated by a conjecture of Dilts and Holst [8]. We also address some issues concerning the conformal structure of cosmological spacetimes.
|
hep-ph/9806299
|
Sabine Kraml
|
A. Bartl, H. Eberl, K. Hidaka, S. Kraml, W. Majerotto, W. Porod, and
Y. Yamada
|
SUSY-QCD corrections to stop and sbottom decays into Higgs bosons
|
revised version, one figure and a few comments added
|
Phys.Rev.D59:115007,1999
|
10.1103/PhysRevD.59.115007
|
UWThPh-1998-11, HEPHY-PUB 688/98, TGU-23, TU-551
|
hep-ph
| null |
We calculate the order(\alpha_s) SUSY-QCD corrections to the widths of stop
and sbottom decays into Higgs bosons within the Minimal Supersymmetric Standard
Model. We give the complete analytical formulae paying particular attention to
the on-shell renormalization of the soft SUSY-breaking parameters. We also
perform a detailed numerical analysis of both stop and sbottom decays into all
Higgs bosons h^0, H^0, A^0, and H^\pm. We find that the SUSY-QCD corrections
are significant, mostly negative and of the order of a few ten percent.
|
[
{
"created": "Mon, 8 Jun 1998 09:39:57 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Dec 1998 11:37:59 GMT",
"version": "v2"
}
] |
2011-01-27
|
[
[
"Bartl",
"A.",
""
],
[
"Eberl",
"H.",
""
],
[
"Hidaka",
"K.",
""
],
[
"Kraml",
"S.",
""
],
[
"Majerotto",
"W.",
""
],
[
"Porod",
"W.",
""
],
[
"Yamada",
"Y.",
""
]
] |
We calculate the order(\alpha_s) SUSY-QCD corrections to the widths of stop and sbottom decays into Higgs bosons within the Minimal Supersymmetric Standard Model. We give the complete analytical formulae paying particular attention to the on-shell renormalization of the soft SUSY-breaking parameters. We also perform a detailed numerical analysis of both stop and sbottom decays into all Higgs bosons h^0, H^0, A^0, and H^\pm. We find that the SUSY-QCD corrections are significant, mostly negative and of the order of a few ten percent.
|
2404.10061
|
Siddhartha Karmakar
|
Siddhartha Karmakar, Amol Dighe and Rick S. Gupta
|
SMEFT predictions for semileptonic processes
|
51 pages, 9 figures, 14 tables
| null | null |
TIFR/TH/24-3
|
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
The $SU(2)_L\times U(1)_Y$ invariance of the Standard Model Effective Field
Theory (SMEFT) predicts multiple restrictions in the space of Wilson
coefficients of $U(1)_{em}$ invariant effective lagrangians such as the
Low-energy Effective Field Theory (LEFT), used for low-energy flavor-physics
observables, or the Higgs Effective Field Theory (HEFT) in unitary gauge,
appropriate for weak-scale observables. In this work, we derive and list all
such predictions for semileptonic operators up to dimension 6. We find that
these predictions can be expressed as 2223 linear relations among the HEFT/LEFT
Wilson coefficients, that are completely independent of any assumptions about
the alignment of the mass and flavor bases. These relations connect diverse
experimental searches such as rare meson decays, high-$p_T$ dilepton searches,
top decays, $Z$-pole observables, charged lepton flavor violating observables
and non-standard neutrino interaction searches. We demonstrate how these
relations can be used to derive strong indirect constraints on multiple Wilson
coefficients that are currently either weakly constrained from direct
experiments or have no direct bound at all. These relations also imply, in
general, that evidence for new physics in a particular search channel must be
accompanied by correlated anomalies in other channels.
|
[
{
"created": "Mon, 15 Apr 2024 18:06:24 GMT",
"version": "v1"
}
] |
2024-04-17
|
[
[
"Karmakar",
"Siddhartha",
""
],
[
"Dighe",
"Amol",
""
],
[
"Gupta",
"Rick S.",
""
]
] |
The $SU(2)_L\times U(1)_Y$ invariance of the Standard Model Effective Field Theory (SMEFT) predicts multiple restrictions in the space of Wilson coefficients of $U(1)_{em}$ invariant effective lagrangians such as the Low-energy Effective Field Theory (LEFT), used for low-energy flavor-physics observables, or the Higgs Effective Field Theory (HEFT) in unitary gauge, appropriate for weak-scale observables. In this work, we derive and list all such predictions for semileptonic operators up to dimension 6. We find that these predictions can be expressed as 2223 linear relations among the HEFT/LEFT Wilson coefficients, that are completely independent of any assumptions about the alignment of the mass and flavor bases. These relations connect diverse experimental searches such as rare meson decays, high-$p_T$ dilepton searches, top decays, $Z$-pole observables, charged lepton flavor violating observables and non-standard neutrino interaction searches. We demonstrate how these relations can be used to derive strong indirect constraints on multiple Wilson coefficients that are currently either weakly constrained from direct experiments or have no direct bound at all. These relations also imply, in general, that evidence for new physics in a particular search channel must be accompanied by correlated anomalies in other channels.
|
1805.08911
|
Chandan Mondal
|
Mohammad Ahmady, Chandan Mondal, Ruben Sandapen
|
Dynamical spin effects in the holographic light-front wavefunctions of
light pseudoscalar mesons
|
27 pages, 8 figures, and 5 tables: Section III on condensates removed
and references for spin structure added. Version accepted for publication in
PRD
|
Phys. Rev. D 98, 034010 (2018)
|
10.1103/PhysRevD.98.034010
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We quantify the importance of dynamical spin effects in the holographic
light-front wavefunctions of the pion, kaon, $\eta$ and $\eta^\prime$. Using a
universal AdS/QCD scale and constituent quark masses, we find that such effects
are maximal in the pion where they lead to an excellent simultaneous
description of a wide range of data: the decay constant, charge radius,
spacelike EM and transition form factors, as well as, after QCD evolution, both
the parton distribution function and the parton distribution amplitude data
from Fermilab. These dynamical spin effects lead up to a $30\%$ chance of
finding the valence quark and antiquark with aligned spins in the pion. The
situation is very different for the kaon, where a simultaneous description of
the available data (decay constant, radius and spacelike EM form factor) prefer
no dynamical spin effects at all. The situation is less clear for the $\eta$
and $\eta^\prime$: while their radiative decay widths data are consistent with
dynamical spin effects only in $\eta^\prime$, the data on their spacelike
transition form factors clearly favor maximal dynamical spin effects in both
mesons.
|
[
{
"created": "Wed, 23 May 2018 00:04:34 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Aug 2018 16:30:55 GMT",
"version": "v2"
}
] |
2018-08-22
|
[
[
"Ahmady",
"Mohammad",
""
],
[
"Mondal",
"Chandan",
""
],
[
"Sandapen",
"Ruben",
""
]
] |
We quantify the importance of dynamical spin effects in the holographic light-front wavefunctions of the pion, kaon, $\eta$ and $\eta^\prime$. Using a universal AdS/QCD scale and constituent quark masses, we find that such effects are maximal in the pion where they lead to an excellent simultaneous description of a wide range of data: the decay constant, charge radius, spacelike EM and transition form factors, as well as, after QCD evolution, both the parton distribution function and the parton distribution amplitude data from Fermilab. These dynamical spin effects lead up to a $30\%$ chance of finding the valence quark and antiquark with aligned spins in the pion. The situation is very different for the kaon, where a simultaneous description of the available data (decay constant, radius and spacelike EM form factor) prefer no dynamical spin effects at all. The situation is less clear for the $\eta$ and $\eta^\prime$: while their radiative decay widths data are consistent with dynamical spin effects only in $\eta^\prime$, the data on their spacelike transition form factors clearly favor maximal dynamical spin effects in both mesons.
|
1910.06308
|
Hajime Fukuda
|
Hajime Fukuda and Kazunori Nakayama
|
Aspects of Nonlinear Effect on Black Hole Superradiance
|
27 pages, 5 figures
| null |
10.1007/JHEP01(2020)128
| null |
hep-ph gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Under some conditions, light boson fields grow exponentially around a
rotating black hole, called the superradiance instability. We discuss effects
of nonlinear interactions of the boson on the instability. In particular, we
focus on the effect of the particle production and show that the growth of the
boson cloud may be saturated much before the black hole spin is extracted by
the boson cloud, while the nonlinear interactions also induce the boson
emission. For application, we revisit the superradiant instability of the
standard model photon, axion and hidden photon.
|
[
{
"created": "Mon, 14 Oct 2019 17:46:07 GMT",
"version": "v1"
}
] |
2020-02-19
|
[
[
"Fukuda",
"Hajime",
""
],
[
"Nakayama",
"Kazunori",
""
]
] |
Under some conditions, light boson fields grow exponentially around a rotating black hole, called the superradiance instability. We discuss effects of nonlinear interactions of the boson on the instability. In particular, we focus on the effect of the particle production and show that the growth of the boson cloud may be saturated much before the black hole spin is extracted by the boson cloud, while the nonlinear interactions also induce the boson emission. For application, we revisit the superradiant instability of the standard model photon, axion and hidden photon.
|
1207.2914
|
Xiao Zhang
|
Yaohua Wang, Naqing Xie, Xiao Zhang
|
The positive energy theorem for asymptotically anti-de Sitter spacetimes
|
24 pages, revised substantially, the new energy-momentum inequality
proved. Appeared in Communications in Contemporary Mathematics
| null |
10.1142/S0219199715500157
| null |
gr-qc math.DG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We establish the inequality for Henneaux-Teitelboim's total energy-momentum
for asymptotically anti-de Sitter initial data sets which are asymptotic to
arbitrary $t$-slice in anti-de Sitter spacetime. In particular, when $t=0$, it
generalizes Chru\'{s}ciel-Maerten-Tod's inequality in the center of AdS mass
coordinates. We also show that the determinant of energy-momentum endomorphism
${\bf Q}$ is the geometric invariant of asymptotically anti-de Sitter
spacetimes.
|
[
{
"created": "Thu, 12 Jul 2012 10:57:31 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Jul 2012 06:10:42 GMT",
"version": "v2"
},
{
"created": "Wed, 6 Feb 2013 04:10:49 GMT",
"version": "v3"
},
{
"created": "Mon, 25 Nov 2013 07:20:25 GMT",
"version": "v4"
},
{
"created": "Tue, 17 Feb 2015 01:28:33 GMT",
"version": "v5"
}
] |
2015-02-18
|
[
[
"Wang",
"Yaohua",
""
],
[
"Xie",
"Naqing",
""
],
[
"Zhang",
"Xiao",
""
]
] |
We establish the inequality for Henneaux-Teitelboim's total energy-momentum for asymptotically anti-de Sitter initial data sets which are asymptotic to arbitrary $t$-slice in anti-de Sitter spacetime. In particular, when $t=0$, it generalizes Chru\'{s}ciel-Maerten-Tod's inequality in the center of AdS mass coordinates. We also show that the determinant of energy-momentum endomorphism ${\bf Q}$ is the geometric invariant of asymptotically anti-de Sitter spacetimes.
|
gr-qc/9509043
|
Angelo Tartaglia
|
A. Tartaglia (Dip. Fisica, Politecnico; Turin, Italy)
|
Four Dimensional Elasticity and General Relativity
|
10 pages; LATEX, uses thmsa.sty now sent to enable PS conversion; to
appear on Gravitation & Cosmology
|
Grav.Cosmol. 1 (1995) 335-338
| null | null |
gr-qc
| null |
It has been shown that the extension of the elasticity theory in more than
three dimensions allows a description of space-time as a properly stressed
medium, even recovering the Minkowski metric in the case of uniaxial stress.
The fundamental equation for the metric in the theory is shown to be the
equilibrium equation for the medium. Examples of spherical and cylindrical
symmetries in four dimensions are considered, evidencing convergencies and
divergencies with the classical general relativity theory. Finally the possible
meaning of the dynamics of the four dimensional elastic medium is discussed.
|
[
{
"created": "Mon, 25 Sep 1995 09:46:18 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Sep 1995 17:33:22 GMT",
"version": "v2"
}
] |
2008-02-03
|
[
[
"Tartaglia",
"A.",
"",
"Dip. Fisica, Politecnico; Turin, Italy"
]
] |
It has been shown that the extension of the elasticity theory in more than three dimensions allows a description of space-time as a properly stressed medium, even recovering the Minkowski metric in the case of uniaxial stress. The fundamental equation for the metric in the theory is shown to be the equilibrium equation for the medium. Examples of spherical and cylindrical symmetries in four dimensions are considered, evidencing convergencies and divergencies with the classical general relativity theory. Finally the possible meaning of the dynamics of the four dimensional elastic medium is discussed.
|
1806.06486
|
Taro Kimura
|
Taro Kimura, Sho Ozaki
|
Conformal field theory analysis for QCD Kondo effect
|
1+22 pages, 1 figure; discussion improved, refs. updated
|
Phys. Rev. D 99, 014040 (2019)
|
10.1103/PhysRevD.99.014040
| null |
hep-ph cond-mat.str-el hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study non-perturbative aspects of QCD Kondo effect, which has been
recently proposed for the finite density and strong magnetic field systems,
using conformal field theory describing the low energy physics near the IR
fixed point. We clarify the symmetry class of QCD Kondo effect both for the
finite density and magnetic field systems, and show how the IR fixed point is
non-perturbatively characterized by the boundary condition, which incorporates
the impurity effect in Kondo problem. We also obtain the low temperature
behavior of several quantities of QCD Kondo effect in the vicinity of the IR
fixed point based on the conformal field theory analysis.
|
[
{
"created": "Mon, 18 Jun 2018 03:11:09 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Feb 2019 12:46:29 GMT",
"version": "v2"
}
] |
2019-02-06
|
[
[
"Kimura",
"Taro",
""
],
[
"Ozaki",
"Sho",
""
]
] |
We study non-perturbative aspects of QCD Kondo effect, which has been recently proposed for the finite density and strong magnetic field systems, using conformal field theory describing the low energy physics near the IR fixed point. We clarify the symmetry class of QCD Kondo effect both for the finite density and magnetic field systems, and show how the IR fixed point is non-perturbatively characterized by the boundary condition, which incorporates the impurity effect in Kondo problem. We also obtain the low temperature behavior of several quantities of QCD Kondo effect in the vicinity of the IR fixed point based on the conformal field theory analysis.
|
2401.14540
|
Roberto Casadio
|
Wenbin Feng, Roldao da Rocha, Roberto Casadio
|
Quantum hair and entropy for slowly rotating quantum black holes
|
Plain LaTeX, 19 pages, clarifications added
| null | null | null |
gr-qc hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
We study the quantum hair associated with coherent states describing slowly
rotating black holes and show how it can be naturally related with the
Bekenstein-Hawking entropy and with 1-loop quantum corrections of the metric
for the (effectively) non-rotating case. We also estimate corrections induced
by such quantum hair to the temperature of the Hawking radiation through the
tunnelling method.
|
[
{
"created": "Thu, 25 Jan 2024 22:13:07 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Apr 2024 13:21:50 GMT",
"version": "v2"
}
] |
2024-04-17
|
[
[
"Feng",
"Wenbin",
""
],
[
"da Rocha",
"Roldao",
""
],
[
"Casadio",
"Roberto",
""
]
] |
We study the quantum hair associated with coherent states describing slowly rotating black holes and show how it can be naturally related with the Bekenstein-Hawking entropy and with 1-loop quantum corrections of the metric for the (effectively) non-rotating case. We also estimate corrections induced by such quantum hair to the temperature of the Hawking radiation through the tunnelling method.
|
hep-ph/9303204
| null |
Bohdan Grz\c{a}dkowski
|
CP Violation in $t \bar{t}$ Production at $e^+ e^-$ Colliders
|
LATEX
|
Phys.Lett.B305:384-391,1993
|
10.1016/0370-2693(93)91071-T
|
CERN-TH.6806/93
|
hep-ph
| null |
The general production {\it and} decay mechanism of $\ttbar$ in future
high-energy $\epem$ colliders has been investigated in a model-independent way,
focusing on an observation of possible CP violation. Angular asymmetries
sensitive to CP violation either in the production {\it or} in the subsequent
decays have been found. General considerations are illustrated through 1-loop
effects induced by gluino exchange in the supersymmetric version of the
Standard Model.
|
[
{
"created": "Tue, 2 Mar 1993 14:58:59 GMT",
"version": "v1"
}
] |
2010-11-01
|
[
[
"Grzcadkowski",
"Bohdan",
""
]
] |
The general production {\it and} decay mechanism of $\ttbar$ in future high-energy $\epem$ colliders has been investigated in a model-independent way, focusing on an observation of possible CP violation. Angular asymmetries sensitive to CP violation either in the production {\it or} in the subsequent decays have been found. General considerations are illustrated through 1-loop effects induced by gluino exchange in the supersymmetric version of the Standard Model.
|
2104.09513
|
Matthew Sievert
|
Andrey V. Sadofyev, Matthew D. Sievert, Ivan Vitev
|
Ab Initio Coupling of Jets to Collective Flow in the Opacity Expansion
Approach
|
94 pages, 12 figures, 1 table
| null |
10.1103/PhysRevD.104.094044
|
LA-UR-21-21420
|
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We calculate the leading corrections to jet momentum broadening and
medium-induced branching that arise from the velocity of the moving medium at
first order in opacity. These results advance our knowledge of jet quenching
and demonstrate how it couples to collective flow of the quark-gluon plasma in
heavy-ion collisions and to the orbital motion of partons in cold nuclear
matter in deep inelastic scattering at the electron-ion collider. We also
compute the leading corrections to jet momentum broadening due to transverse
gradients of temperature and density. We find that these effects lead to both
anisotropic transverse momentum diffusion proportional to the medium velocity
and anisotropic medium-induced radiation emitted preferentially in the
direction of the flow. We isolate the relevant sub-eikonal corrections by
working with jets composed of scalar particles with arbitrary color factors
interacting with the medium by scalar QCD. Appropriate substitution of the
color factors and light-front wave functions allow us to immediately apply the
results to a range of processes including $q \rightarrow q g$ branching in real
QCD. The resulting general expressions can be directly coupled to hydrodynamic
simulations on an event-by-event basis to study the correlations between jet
quenching and the dynamics of various forms of nuclear matter.
|
[
{
"created": "Mon, 19 Apr 2021 18:00:01 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Jan 2022 02:58:30 GMT",
"version": "v2"
}
] |
2022-01-24
|
[
[
"Sadofyev",
"Andrey V.",
""
],
[
"Sievert",
"Matthew D.",
""
],
[
"Vitev",
"Ivan",
""
]
] |
We calculate the leading corrections to jet momentum broadening and medium-induced branching that arise from the velocity of the moving medium at first order in opacity. These results advance our knowledge of jet quenching and demonstrate how it couples to collective flow of the quark-gluon plasma in heavy-ion collisions and to the orbital motion of partons in cold nuclear matter in deep inelastic scattering at the electron-ion collider. We also compute the leading corrections to jet momentum broadening due to transverse gradients of temperature and density. We find that these effects lead to both anisotropic transverse momentum diffusion proportional to the medium velocity and anisotropic medium-induced radiation emitted preferentially in the direction of the flow. We isolate the relevant sub-eikonal corrections by working with jets composed of scalar particles with arbitrary color factors interacting with the medium by scalar QCD. Appropriate substitution of the color factors and light-front wave functions allow us to immediately apply the results to a range of processes including $q \rightarrow q g$ branching in real QCD. The resulting general expressions can be directly coupled to hydrodynamic simulations on an event-by-event basis to study the correlations between jet quenching and the dynamics of various forms of nuclear matter.
|
README.md exists but content is empty.
- Downloads last month
- 1