id
stringlengths 9
14
| submitter
stringlengths 1
64
⌀ | authors
stringlengths 5
22.9k
| title
stringlengths 3
381
| comments
stringlengths 1
675
⌀ | journal-ref
stringlengths 4
362
⌀ | doi
stringlengths 9
138
⌀ | report-no
stringlengths 2
341
⌀ | categories
stringlengths 5
87
| license
stringclasses 9
values | orig_abstract
stringlengths 16
2.94k
| versions
listlengths 1
61
| update_date
stringlengths 10
10
| authors_parsed
listlengths 1
1.74k
| abstract
stringlengths 13
2.94k
|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1702.04208
|
Carlos Louren\c{c}o
|
Pietro Faccioli, Mariana Ara\'ujo, Valentin Kn\"unz, Ilse
Kr\"atschmer, Carlos Louren\c{c}o, Jo\~ao Seixas
|
Quarkonium production at the LHC: a data-driven analysis of NRQCD's
predictions
|
Submitted to Phys. Lett. B
| null |
10.1016/j.physletb.2017.09.006
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
While non-relativistic QCD (NRQCD) foresees a variety of elementary
quarkonium production mechanisms naturally leading to state-dependent kinematic
patterns, the LHC cross sections and polarization measurements reveal a
remarkably simple production scenario, independent of the quantum numbers and
masses of the quarkonia. Surprisingly, NRQCD is able to accommodate the
observed universal scenario, through a series of conspiring cancellations
smoothing out its otherwise variegated hierarchy of mechanisms. This seemingly
unnatural solution implies that the $\chi_{c1}$ and $\chi_{c2}$ polarizations,
not yet measured, are strong and opposite, representing the only potential
exception to a remarkably simple picture of quarkonium production. The
observation of a large difference between $\chi_{c2}$ and $\chi_{c1}$
polarizations, which cannot be indirectly extracted from existing measurements
because they mutually cancel each other in their contribution to the observed
J/$\psi$ production, would be a smoking gun signal finally proving the
multifaceted but mysteriously elusive structure of NRQCD. On the other hand,
the measurement of two similar, small polarizations will urge improved P-wave
calculations, if not a substantial revision of the NRQCD hierarchies.
|
[
{
"created": "Tue, 14 Feb 2017 13:51:33 GMT",
"version": "v1"
}
] |
2017-10-11
|
[
[
"Faccioli",
"Pietro",
""
],
[
"Araújo",
"Mariana",
""
],
[
"Knünz",
"Valentin",
""
],
[
"Krätschmer",
"Ilse",
""
],
[
"Lourenço",
"Carlos",
""
],
[
"Seixas",
"João",
""
]
] |
While non-relativistic QCD (NRQCD) foresees a variety of elementary quarkonium production mechanisms naturally leading to state-dependent kinematic patterns, the LHC cross sections and polarization measurements reveal a remarkably simple production scenario, independent of the quantum numbers and masses of the quarkonia. Surprisingly, NRQCD is able to accommodate the observed universal scenario, through a series of conspiring cancellations smoothing out its otherwise variegated hierarchy of mechanisms. This seemingly unnatural solution implies that the $\chi_{c1}$ and $\chi_{c2}$ polarizations, not yet measured, are strong and opposite, representing the only potential exception to a remarkably simple picture of quarkonium production. The observation of a large difference between $\chi_{c2}$ and $\chi_{c1}$ polarizations, which cannot be indirectly extracted from existing measurements because they mutually cancel each other in their contribution to the observed J/$\psi$ production, would be a smoking gun signal finally proving the multifaceted but mysteriously elusive structure of NRQCD. On the other hand, the measurement of two similar, small polarizations will urge improved P-wave calculations, if not a substantial revision of the NRQCD hierarchies.
|
2001.03104
|
Eduardo Castillo Ruiz
|
E. Castillo-Ruiz, V. Pleitez and O. P. Ravinez
|
Electric charge assignment in quantum field theories
|
20 pages
| null | null | null |
hep-ph hep-th
|
http://creativecommons.org/publicdomain/zero/1.0/
|
In Field theories with simple or semi-simple unitary, local or global
symmetries, the electric charge is related to a global one. This is the case
also in electroweak gauge theories even before the spontaneous symmetry
breaking (SSB), where these quantities are defined in order to expand the
Lagrangian respecting the conservation laws after the breaking. So, the
electric charge assignment within a given multiplet is done (in units of jej)
considering only global symmetries, even though in general, the electric charge
operator is a linear combination of the diagonal generators of the non-Abelian
symmetry plus some Abelian factor. In this work we show how this operator can
be systematically constructed from any representation in the Standard Model and
some of its extensions as the 3-3-1, left-right symmetric and grand unified
models.
|
[
{
"created": "Thu, 9 Jan 2020 17:05:01 GMT",
"version": "v1"
}
] |
2020-01-10
|
[
[
"Castillo-Ruiz",
"E.",
""
],
[
"Pleitez",
"V.",
""
],
[
"Ravinez",
"O. P.",
""
]
] |
In Field theories with simple or semi-simple unitary, local or global symmetries, the electric charge is related to a global one. This is the case also in electroweak gauge theories even before the spontaneous symmetry breaking (SSB), where these quantities are defined in order to expand the Lagrangian respecting the conservation laws after the breaking. So, the electric charge assignment within a given multiplet is done (in units of jej) considering only global symmetries, even though in general, the electric charge operator is a linear combination of the diagonal generators of the non-Abelian symmetry plus some Abelian factor. In this work we show how this operator can be systematically constructed from any representation in the Standard Model and some of its extensions as the 3-3-1, left-right symmetric and grand unified models.
|
gr-qc/0505159
|
Andrea Fuster
|
A. Fuster and J.W. van Holten
|
Type III Einstein-Yang-Mills solutions
|
revtex, 4 pages, minor changes, some factors and references
corrected, footnote added
|
Phys.Rev. D72 (2005) 024011
|
10.1103/PhysRevD.72.024011
|
NIKHEF/2005-009
|
gr-qc hep-th
| null |
We construct two distinct classes of exact type III solutions of the D=4
Einstein-Yang-Mills system. The solutions are embeddings of the non-abelian
plane waves in spacetimes in Kundt's class. Reduction of the solutions to type
N leads to generalized $pp$ and Kundt waves. The geodesic equations are briefly
discussed.
|
[
{
"created": "Tue, 31 May 2005 14:23:20 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Jun 2005 15:07:59 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Fuster",
"A.",
""
],
[
"van Holten",
"J. W.",
""
]
] |
We construct two distinct classes of exact type III solutions of the D=4 Einstein-Yang-Mills system. The solutions are embeddings of the non-abelian plane waves in spacetimes in Kundt's class. Reduction of the solutions to type N leads to generalized $pp$ and Kundt waves. The geodesic equations are briefly discussed.
|
1704.04004
|
Avadhut Purohit
|
Avadhut Purohit
|
Canonical gravity and scalar fields
|
12 pages, no figure, with few corrections
| null | null | null |
gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A combined variable theory of gravity and scalar field is developed under ADM
formulation by redefining new canonical conjugate variables ({\Phi}, {\Pi}). It
is a dynamical theory of the space-matter with implicit time dependence.
Quantizing this new field theory results in quantization of geometry and scalar
field combined.
|
[
{
"created": "Thu, 13 Apr 2017 06:24:54 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Apr 2017 15:35:49 GMT",
"version": "v2"
},
{
"created": "Fri, 2 Feb 2018 11:18:39 GMT",
"version": "v3"
},
{
"created": "Thu, 24 May 2018 16:56:14 GMT",
"version": "v4"
},
{
"created": "Wed, 30 May 2018 04:29:03 GMT",
"version": "v5"
}
] |
2018-05-31
|
[
[
"Purohit",
"Avadhut",
""
]
] |
A combined variable theory of gravity and scalar field is developed under ADM formulation by redefining new canonical conjugate variables ({\Phi}, {\Pi}). It is a dynamical theory of the space-matter with implicit time dependence. Quantizing this new field theory results in quantization of geometry and scalar field combined.
|
2407.09325
|
Fernando Alvarado
|
Fernando Alvarado, Luis Alvarez-Ruso, Eliecer Hernandez, Juan Nieves
and Neus Penalva
|
The $\Lambda_c\to \Lambda\, l^+\nu_\ell$ weak decay including new
physics
| null | null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We investigate the $\Lambda_c \to \Lambda \ell^{+} \nu_\ell$ decay with a
focus on potential new physics (NP) effects in the $\ell = \mu$ channel. We
employ an effective Hamiltonian within the framework of the Standard Model
Effective Field Theory (SMEFT) to consider generalized dimension-6 semileptonic
$c\to s$ operators of scalar, pseudoscalar, vector, axial-vector and tensor
types. We rely on Lattice QCD (LQCD) for the hadronic transition form factors,
using heavy quark spin symmetry (HQSS) to determine those that have not yet
been obtained on the lattice. Uncertainties due to the truncation of the NP
Hamiltonian and different implementations of HQSS are taken into account. As a
result, we unravel the NP discovery potential of the $\Lambda_c\to \Lambda$
semileptonic decay in different observables. Our findings indicate high
sensitivity to NP in lepton flavour universality ratios, probing multi-TeV
scales in some cases. On the theoretical side, we identify LQCD uncertainties
in axial and vector form factors as critical for improving NP sensitivity,
alongside better SMEFT uncertainty estimations.
|
[
{
"created": "Fri, 12 Jul 2024 15:01:15 GMT",
"version": "v1"
}
] |
2024-07-15
|
[
[
"Alvarado",
"Fernando",
""
],
[
"Alvarez-Ruso",
"Luis",
""
],
[
"Hernandez",
"Eliecer",
""
],
[
"Nieves",
"Juan",
""
],
[
"Penalva",
"Neus",
""
]
] |
We investigate the $\Lambda_c \to \Lambda \ell^{+} \nu_\ell$ decay with a focus on potential new physics (NP) effects in the $\ell = \mu$ channel. We employ an effective Hamiltonian within the framework of the Standard Model Effective Field Theory (SMEFT) to consider generalized dimension-6 semileptonic $c\to s$ operators of scalar, pseudoscalar, vector, axial-vector and tensor types. We rely on Lattice QCD (LQCD) for the hadronic transition form factors, using heavy quark spin symmetry (HQSS) to determine those that have not yet been obtained on the lattice. Uncertainties due to the truncation of the NP Hamiltonian and different implementations of HQSS are taken into account. As a result, we unravel the NP discovery potential of the $\Lambda_c\to \Lambda$ semileptonic decay in different observables. Our findings indicate high sensitivity to NP in lepton flavour universality ratios, probing multi-TeV scales in some cases. On the theoretical side, we identify LQCD uncertainties in axial and vector form factors as critical for improving NP sensitivity, alongside better SMEFT uncertainty estimations.
|
0810.0613
|
Gil Jannes
|
G. Jannes
|
On the condensed matter scheme for emergent gravity and interferometry
|
11 pages; to appear in: F. Columbus (ed.), "Interferometers:
Research, Technology and Applications". v2: reference added, minor
corrections
|
in: D. Halsey and W. Raynor (eds.), Handbook of Interferometers;
Research, Technology and Applications. Nova Science (2009), pp.55-71
| null | null |
gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
An increasingly popular approach to quantum gravity rests on the idea that
gravity (and maybe electromagnetism and the other gauge fields) might be an
'emergent phenomenon', in the sense of representing a collective behaviour
resulting from a very different microscopic physics. A prominent example of
this approach is the condensed matter scheme for quantum gravity, which
considers the possibility that gravity emerges as an effective low-energy
phenomenon from the quantum vacuum in a way similar to the emergence of
collective excitations in condensed matter systems. This condensed matter view
of the quantum vacuum clearly hints that, while the term 'ether' has been
discredited for about a century, quantum gravity holds many (if not all) of the
characteristics that have led people in the past to label various hypothetical
substances with the term 'ether'. Since the last burst of enthusiasm for an
ether, at the end of the 19th century, was brought to the grave in part by the
performance of a series of important experiments in interferometry, the
suggestion then naturally arises that maybe interferometry could also play a
role in the current discussion on quantum gravity. We will highlight some
aspects of this suggestion in the context of the condensed matter scheme for
emergent gravity.
|
[
{
"created": "Fri, 3 Oct 2008 10:37:21 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Nov 2008 14:27:11 GMT",
"version": "v2"
}
] |
2011-05-25
|
[
[
"Jannes",
"G.",
""
]
] |
An increasingly popular approach to quantum gravity rests on the idea that gravity (and maybe electromagnetism and the other gauge fields) might be an 'emergent phenomenon', in the sense of representing a collective behaviour resulting from a very different microscopic physics. A prominent example of this approach is the condensed matter scheme for quantum gravity, which considers the possibility that gravity emerges as an effective low-energy phenomenon from the quantum vacuum in a way similar to the emergence of collective excitations in condensed matter systems. This condensed matter view of the quantum vacuum clearly hints that, while the term 'ether' has been discredited for about a century, quantum gravity holds many (if not all) of the characteristics that have led people in the past to label various hypothetical substances with the term 'ether'. Since the last burst of enthusiasm for an ether, at the end of the 19th century, was brought to the grave in part by the performance of a series of important experiments in interferometry, the suggestion then naturally arises that maybe interferometry could also play a role in the current discussion on quantum gravity. We will highlight some aspects of this suggestion in the context of the condensed matter scheme for emergent gravity.
|
1203.1859
|
Lorenzo Iorio
|
Lorenzo Iorio
|
Orbital effects of Lorentz-violating Standard Model Extension
gravitomagnetism around a static body: a sensitivity analysis
|
LaTex2e, 9 pages, no figures, 3 tables, 25 references. Typos fixed
|
Class. Quant. Gravit..29:175007,2012
|
10.1088/0264-9381/29/17/175007
| null |
gr-qc astro-ph.EP physics.space-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We analytically work out the long-term rates of change of the six osculating
Keplerian orbital elements of a test particle acted upon by the
Lorentz-violating gravitomagnetic acceleration due to a static body, as
predicted by the Standard Model Extension (SME). We neither restrict to any
specific spatial orientation for the symmetry-violating vector s nor make a
priori simplifying assumptions concerning the orbital configuration of the
perturbed test particle. Thus, our results are quite general, and can be
applied for sensitivity analyses to a variety of specific astronomical and
astrophysical scenarios. We find that, apart from the semimajor axis a, all the
other orbital elements undergo non-vanishing secular variations. By comparing
our results to the latest determinations of the supplementary advances of the
perihelia of some planets of the solar system we preliminarily obtain s_x =
(0.9 +/- 1.5) 10^-8, s_y = (-4 +/- 6) 10^-9, s_z = (0.3 +/- 1) 10^-9. Bounds
from the terrestrial LAGEOS and LAGEOS II satellites are of the order of s\sim
10^-3-10^-4.
|
[
{
"created": "Thu, 8 Mar 2012 17:31:10 GMT",
"version": "v1"
},
{
"created": "Sun, 11 Mar 2012 01:07:18 GMT",
"version": "v2"
}
] |
2012-08-22
|
[
[
"Iorio",
"Lorenzo",
""
]
] |
We analytically work out the long-term rates of change of the six osculating Keplerian orbital elements of a test particle acted upon by the Lorentz-violating gravitomagnetic acceleration due to a static body, as predicted by the Standard Model Extension (SME). We neither restrict to any specific spatial orientation for the symmetry-violating vector s nor make a priori simplifying assumptions concerning the orbital configuration of the perturbed test particle. Thus, our results are quite general, and can be applied for sensitivity analyses to a variety of specific astronomical and astrophysical scenarios. We find that, apart from the semimajor axis a, all the other orbital elements undergo non-vanishing secular variations. By comparing our results to the latest determinations of the supplementary advances of the perihelia of some planets of the solar system we preliminarily obtain s_x = (0.9 +/- 1.5) 10^-8, s_y = (-4 +/- 6) 10^-9, s_z = (0.3 +/- 1) 10^-9. Bounds from the terrestrial LAGEOS and LAGEOS II satellites are of the order of s\sim 10^-3-10^-4.
|
1801.02632
|
Igor Khavkine
|
Markus B. Fr\"ob, Thomas-Paul Hack, Igor Khavkine
|
Approaches to linear local gauge-invariant observables in inflationary
cosmologies
|
v2: 15 pages, expanded introduction, close to published version; v1:
9 pages
|
Class. Quantum Grav. 35, 115002 (2018)
|
10.1088/1361-6382/aabcb7
| null |
gr-qc math-ph math.MP
|
http://creativecommons.org/licenses/by/4.0/
|
We review and relate two recent complementary constructions of linear local
gauge-invariant observables for cosmological perturbations in generic spatially
flat single-field inflationary cosmologies. After briefly discussing their
physical significance, we give explicit, covariant and mutually invertible
transformations between the two sets of observables, thus resolving any doubts
about their equivalence. In this way, we get a geometric interpretation and
show the completeness of both sets of observables, while previously each of
these properties was available only for one of them.
|
[
{
"created": "Mon, 8 Jan 2018 19:00:08 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Sep 2019 08:57:57 GMT",
"version": "v2"
}
] |
2019-09-20
|
[
[
"Fröb",
"Markus B.",
""
],
[
"Hack",
"Thomas-Paul",
""
],
[
"Khavkine",
"Igor",
""
]
] |
We review and relate two recent complementary constructions of linear local gauge-invariant observables for cosmological perturbations in generic spatially flat single-field inflationary cosmologies. After briefly discussing their physical significance, we give explicit, covariant and mutually invertible transformations between the two sets of observables, thus resolving any doubts about their equivalence. In this way, we get a geometric interpretation and show the completeness of both sets of observables, while previously each of these properties was available only for one of them.
|
1805.08591
|
Roman Ryutin Dr
|
R.A. Ryutin
|
ExDiff Monte Carlo generator for Exclusive Diffraction. Version 2.0.
Physics and manual
|
34 pages, 2 figures. arXiv admin note: substantial text overlap with
arXiv:1704.04387
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
ExDiff2.0 is a Monte Carlo event generator for simulation of Exclusive
Diffractive processes in proton-proton collisions. The present version includes
reactions: elastic scattering $pp\to pp$ at 7, 8, 13, 14~TeV; $pp\to p+R+p$, $R
= f_0(1500)$, $f_0(1710)$, $f_2(1950)$ at 8 and 13~TeV, $f_2(1270)$ at 8~TeV,
$f_2(2220)$ at 13~TeV. In the future versions many processes of Central
Exclusive Diffractive Production will be added. This version is linked to
PYTHIA 8 (to make resonance decays and hadronization) and also to ROOT and
HEPMC output via PYTHIA 8 interface. Also some test files of Born distributions
for CEDP of two pions are added.
|
[
{
"created": "Mon, 14 May 2018 11:12:12 GMT",
"version": "v1"
}
] |
2018-05-23
|
[
[
"Ryutin",
"R. A.",
""
]
] |
ExDiff2.0 is a Monte Carlo event generator for simulation of Exclusive Diffractive processes in proton-proton collisions. The present version includes reactions: elastic scattering $pp\to pp$ at 7, 8, 13, 14~TeV; $pp\to p+R+p$, $R = f_0(1500)$, $f_0(1710)$, $f_2(1950)$ at 8 and 13~TeV, $f_2(1270)$ at 8~TeV, $f_2(2220)$ at 13~TeV. In the future versions many processes of Central Exclusive Diffractive Production will be added. This version is linked to PYTHIA 8 (to make resonance decays and hadronization) and also to ROOT and HEPMC output via PYTHIA 8 interface. Also some test files of Born distributions for CEDP of two pions are added.
|
2201.00226
|
James B. Hartle
|
James B. Hartle
|
Simplicial Quantum Gravity
|
14 pages, revtex4, content unchanged from ist version but typos and
other small mistakes fixed
| null | null | null |
gr-qc hep-th physics.hist-ph quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Simplicial approximation and the ideas associated with the Regge
calculus.provide a concrete way of implementing a sum over histories
formulation ofquantum gravity. A four-dimensional simplicial geometry is made
up of flat four-simplices joined together.A sum over simplicial geometries is a
sum over thedifferent ways the simplices can be joined together with an
integral over their edge lengths.Theconstruction of the simplicial Euclidean
action for this approach to quantum general relativity is illustrated. The
recovery of the diffeomorphism group in the continuum limit is discussed. Some
possible classes of simplicial complexes with which to define a sum over
topologies are described.
|
[
{
"created": "Sat, 1 Jan 2022 18:20:07 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Jan 2022 22:07:04 GMT",
"version": "v2"
}
] |
2022-01-27
|
[
[
"Hartle",
"James B.",
""
]
] |
Simplicial approximation and the ideas associated with the Regge calculus.provide a concrete way of implementing a sum over histories formulation ofquantum gravity. A four-dimensional simplicial geometry is made up of flat four-simplices joined together.A sum over simplicial geometries is a sum over thedifferent ways the simplices can be joined together with an integral over their edge lengths.Theconstruction of the simplicial Euclidean action for this approach to quantum general relativity is illustrated. The recovery of the diffeomorphism group in the continuum limit is discussed. Some possible classes of simplicial complexes with which to define a sum over topologies are described.
|
1211.5416
|
Sergey Goloskokov
|
S. V. Goloskokov
|
Polarized GPDs in pions and kaons electroproduction. Tranversity effects
|
8 pages, 12 figures, talk at the International Conference "Advanced
Studies Institute Symmetries And Spin" (SPIN-Praha-2012) Prague, July 1 - 8,
2012
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/publicdomain/
|
We analyze the electroproduction of pseudoscalar mesons within the handbag
approach. To investigate these reactions, we consider the leading-twist
contribution together with the transversity twist-3 effects that are crucial in
the description of experimental data. Our results on the cross section are in
agreement with experiment. We present our predictions for spin observables.
|
[
{
"created": "Fri, 23 Nov 2012 06:24:47 GMT",
"version": "v1"
}
] |
2012-11-26
|
[
[
"Goloskokov",
"S. V.",
""
]
] |
We analyze the electroproduction of pseudoscalar mesons within the handbag approach. To investigate these reactions, we consider the leading-twist contribution together with the transversity twist-3 effects that are crucial in the description of experimental data. Our results on the cross section are in agreement with experiment. We present our predictions for spin observables.
|
1201.5053
|
Maksim Nekrasov L
|
M. L. Nekrasov
|
Results of numerical simulations for unstable-particles pair production
in modified perturbation theory in NNLO
|
8 pages, 3 figures. To be published in Proceedings of QFTHEP 2011
|
PoS(QFTHEP2011)036
| null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider pair production and decay of fundamental unstable particles in
the framework of a modified perturbation theory (MPT), which treats resonant
contributions of unstable particles in the sense of distributions. The
cross-sections for the top-quark pair production and for the $W$-boson pair
production in $e^{+}e^{-}$ annihilation are calculated within the NNLO in
models that admit exact solutions. In both cases an excellent convergence of
the MPT is detected at the energies close to and above the maximum of the cross
section. In the case of $W$-boson pair production a precision of the
description at the ILC energies is ensured at the level of one per-mille or
higher.
|
[
{
"created": "Tue, 24 Jan 2012 17:03:05 GMT",
"version": "v1"
}
] |
2012-10-02
|
[
[
"Nekrasov",
"M. L.",
""
]
] |
We consider pair production and decay of fundamental unstable particles in the framework of a modified perturbation theory (MPT), which treats resonant contributions of unstable particles in the sense of distributions. The cross-sections for the top-quark pair production and for the $W$-boson pair production in $e^{+}e^{-}$ annihilation are calculated within the NNLO in models that admit exact solutions. In both cases an excellent convergence of the MPT is detected at the energies close to and above the maximum of the cross section. In the case of $W$-boson pair production a precision of the description at the ILC energies is ensured at the level of one per-mille or higher.
|
2005.07100
|
Jesse Giron
|
Jesse F. Giron and Richard F. Lebed
|
Spectrum of the Hidden-Bottom and the Hidden-Charm/Strange Exotics in
the Dynamical Diquark Model
|
15 pages, 2 .pdf figures, Small revisions to the Reference section.
Version accepted to appear in Physical Review D
|
Phys. Rev. D 102, 014036 (2020)
|
10.1103/PhysRevD.102.014036
| null |
hep-ph hep-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The lightest hidden-bottom tetraquarks in the dynamical diquark model fill an
$S$-wave multiplet consisting of 12 isomultiplets. We predict their masses and
dominant bottomonium decay channels using a simple 3-parameter Hamiltonian that
captures the core fine-structure features of the model, including isospin
dependence. The only experimental inputs needed are the corresponding
observables for $Z_b(10610)$ and $Z_b(10650)$. The mass of $X_b$, the bottom
analogue to $X(3872)$, is highly constrained in this scheme. In addition, using
lattice-calculated potentials we predict the location of the center of mass of
the $P$-wave multiplet and find that $Y(10860)$ fits well but the newly
discovered $Y(10750)$ does not, more plausibly being a $D$-wave bottomonium
state. Using similar methods, we also examine the lowest $S$-wave multiplet of
6 $c\bar c s\bar s$ states, assuming as in earlier work that $X(3915)$ and
$Y(4140)$ are members, and predict the masses and dominant charmonium decay
modes of the other states. We again use lattice potentials to compute the
centers of mass of higher multiplets, and find them to be compatible with the
masses of $Y(4626)$ ($1P$) and $X(4700)$ ($2S$), respectively.
|
[
{
"created": "Thu, 14 May 2020 16:08:42 GMT",
"version": "v1"
},
{
"created": "Mon, 18 May 2020 15:19:27 GMT",
"version": "v2"
},
{
"created": "Tue, 21 Jul 2020 15:31:59 GMT",
"version": "v3"
}
] |
2020-07-29
|
[
[
"Giron",
"Jesse F.",
""
],
[
"Lebed",
"Richard F.",
""
]
] |
The lightest hidden-bottom tetraquarks in the dynamical diquark model fill an $S$-wave multiplet consisting of 12 isomultiplets. We predict their masses and dominant bottomonium decay channels using a simple 3-parameter Hamiltonian that captures the core fine-structure features of the model, including isospin dependence. The only experimental inputs needed are the corresponding observables for $Z_b(10610)$ and $Z_b(10650)$. The mass of $X_b$, the bottom analogue to $X(3872)$, is highly constrained in this scheme. In addition, using lattice-calculated potentials we predict the location of the center of mass of the $P$-wave multiplet and find that $Y(10860)$ fits well but the newly discovered $Y(10750)$ does not, more plausibly being a $D$-wave bottomonium state. Using similar methods, we also examine the lowest $S$-wave multiplet of 6 $c\bar c s\bar s$ states, assuming as in earlier work that $X(3915)$ and $Y(4140)$ are members, and predict the masses and dominant charmonium decay modes of the other states. We again use lattice potentials to compute the centers of mass of higher multiplets, and find them to be compatible with the masses of $Y(4626)$ ($1P$) and $X(4700)$ ($2S$), respectively.
|
0812.4501
|
Vladimir Zoller
|
R. Fiore and V.R. Zoller
|
Higher twist effects in charmed-strange $\nu$DIS diffraction
|
13 pages, 2 figures, published version
|
Phys.Lett.B681:32-36,2009
|
10.1016/j.physletb.2009.09.060
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The non-conservation of charmed-strange current in the neutrino deep
inelastic scattering ($\nu$DIS) strongly affects the longitudinal structure
function, $F_L$, at small values of Bjorken $x$. The corresponding correction
to $F_L$ is a higher twist effect enhanced at small-$x$ by the rapidly growing
gluon density factor. As a result, the component of $F_L$ induced by the
charmed-strange current prevails over the light-quark component and dominates
$F_L=F_L^{cs}+F_L^{ud}$ at $x\lsim 0.01$ and $Q^2\sim m_c^2$. The color dipole
analysis clarifies the physics behind the phenomenon and provides a
quantitative estimate of the effect.
|
[
{
"created": "Wed, 24 Dec 2008 16:39:44 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Nov 2009 15:13:51 GMT",
"version": "v2"
}
] |
2009-11-30
|
[
[
"Fiore",
"R.",
""
],
[
"Zoller",
"V. R.",
""
]
] |
The non-conservation of charmed-strange current in the neutrino deep inelastic scattering ($\nu$DIS) strongly affects the longitudinal structure function, $F_L$, at small values of Bjorken $x$. The corresponding correction to $F_L$ is a higher twist effect enhanced at small-$x$ by the rapidly growing gluon density factor. As a result, the component of $F_L$ induced by the charmed-strange current prevails over the light-quark component and dominates $F_L=F_L^{cs}+F_L^{ud}$ at $x\lsim 0.01$ and $Q^2\sim m_c^2$. The color dipole analysis clarifies the physics behind the phenomenon and provides a quantitative estimate of the effect.
|
1201.4598
|
Abhay Ashtekar
|
Abhay Ashtekar
|
Introduction to Loop Quantum Gravity
|
30 pages, 2 figures. arXiv admin note: substantial text overlap with
arXiv:gr-qc/0410054
| null |
10.1007/978-3-642-33036-0_2
|
IGC/12/1-5
|
gr-qc hep-th math-ph math.MP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This article is based on the opening lecture at the third quantum geometry
and quantum gravity school sponsored by the European Science Foundation and
held at Zakopane, Poland in March 2011. The goal of the lecture was to present
a broad perspective on loop quantum gravity for young researchers. The first
part is addressed to beginning students and the second to young researchers who
are already working in quantum gravity.
|
[
{
"created": "Sun, 22 Jan 2012 20:46:13 GMT",
"version": "v1"
}
] |
2015-06-03
|
[
[
"Ashtekar",
"Abhay",
""
]
] |
This article is based on the opening lecture at the third quantum geometry and quantum gravity school sponsored by the European Science Foundation and held at Zakopane, Poland in March 2011. The goal of the lecture was to present a broad perspective on loop quantum gravity for young researchers. The first part is addressed to beginning students and the second to young researchers who are already working in quantum gravity.
|
0808.2318
|
Jonathan Feng
|
Jonathan L. Feng, Huitzu Tu, Hai-Bo Yu
|
Thermal Relics in Hidden Sectors
|
20 pages, 8 figures; v2: references added; v3: published version
|
JCAP 0810:043,2008
|
10.1088/1475-7516/2008/10/043
|
UCI-TR-2008-26
|
hep-ph astro-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Dark matter may be hidden, with no standard model gauge interactions. At the
same time, in WIMPless models with hidden matter masses proportional to hidden
gauge couplings squared, the hidden dark matter's thermal relic density may
naturally be in the right range, preserving the key quantitative virtue of
WIMPs. We consider this possibility in detail. We first determine
model-independent constraints on hidden sectors from Big Bang nucleosynthesis
and the cosmic microwave background. Contrary to conventional wisdom, large
hidden sectors are easily accommodated. A flavour-free version of the standard
model is allowed if the hidden sector is just 30% colder than the observable
sector after reheating. Alternatively, if the hidden sector contains a
1-generation version of the standard model with characteristic mass scale below
1 MeV, even identical reheating temperatures are allowed. We then analyze
hidden sector freezeout in detail for a concrete model, solving the Boltzmann
equation numerically and understanding the results from both observable and
hidden sector points of view. We find that WIMPless dark matter indeed obtains
the correct relic density for masses in the range keV < m_X < TeV. The upper
bound results from the requirement of perturbativity, and the lower bound
assumes that the observable and hidden sectors reheat to the same temperature
and is raised to the MeV scale if the hidden sector is 10 times colder.
WIMPless dark matter therefore generalizes the WIMP paradigm to the largest
mass range possible for viable thermal relics and provides a unified framework
for exploring dark matter signals across nine orders of magnitude in dark
matter mass.
|
[
{
"created": "Mon, 18 Aug 2008 19:19:45 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Aug 2008 21:17:13 GMT",
"version": "v2"
},
{
"created": "Mon, 3 Nov 2008 23:22:49 GMT",
"version": "v3"
}
] |
2009-11-18
|
[
[
"Feng",
"Jonathan L.",
""
],
[
"Tu",
"Huitzu",
""
],
[
"Yu",
"Hai-Bo",
""
]
] |
Dark matter may be hidden, with no standard model gauge interactions. At the same time, in WIMPless models with hidden matter masses proportional to hidden gauge couplings squared, the hidden dark matter's thermal relic density may naturally be in the right range, preserving the key quantitative virtue of WIMPs. We consider this possibility in detail. We first determine model-independent constraints on hidden sectors from Big Bang nucleosynthesis and the cosmic microwave background. Contrary to conventional wisdom, large hidden sectors are easily accommodated. A flavour-free version of the standard model is allowed if the hidden sector is just 30% colder than the observable sector after reheating. Alternatively, if the hidden sector contains a 1-generation version of the standard model with characteristic mass scale below 1 MeV, even identical reheating temperatures are allowed. We then analyze hidden sector freezeout in detail for a concrete model, solving the Boltzmann equation numerically and understanding the results from both observable and hidden sector points of view. We find that WIMPless dark matter indeed obtains the correct relic density for masses in the range keV < m_X < TeV. The upper bound results from the requirement of perturbativity, and the lower bound assumes that the observable and hidden sectors reheat to the same temperature and is raised to the MeV scale if the hidden sector is 10 times colder. WIMPless dark matter therefore generalizes the WIMP paradigm to the largest mass range possible for viable thermal relics and provides a unified framework for exploring dark matter signals across nine orders of magnitude in dark matter mass.
|
hep-ph/9506237
|
Alexander V. Lanyov
|
A.A.Bel'kov, A.V.Lanyov and A.Schaale
|
Calculation of Heat-Kernel Coefficients and Usage of Computer Algebra
|
12 pages, LaTeX, no figures. Extended version of contribution to
AIHENP'95, Pisa, April 3-8, 1995
|
Comput.Phys.Commun.95:123-130,1996
|
10.1016/0010-4655(96)00031-8
|
JINR E2-95-238
|
hep-ph
| null |
The calculation of heat-kernel coefficients with the classical DeWitt
algorithm has been discussed. We present the explicit form of the coefficients
up to $h_5$ in the general case and up to $h_7^{min}$ for the minimal parts.
The results are compared with the expressions in other papers. A method to
optimize the usage of memory for working with large expressions on universal
computer algebra systems has been proposed.
|
[
{
"created": "Mon, 5 Jun 1995 11:32:35 GMT",
"version": "v1"
}
] |
2011-04-15
|
[
[
"Bel'kov",
"A. A.",
""
],
[
"Lanyov",
"A. V.",
""
],
[
"Schaale",
"A.",
""
]
] |
The calculation of heat-kernel coefficients with the classical DeWitt algorithm has been discussed. We present the explicit form of the coefficients up to $h_5$ in the general case and up to $h_7^{min}$ for the minimal parts. The results are compared with the expressions in other papers. A method to optimize the usage of memory for working with large expressions on universal computer algebra systems has been proposed.
|
1610.02687
|
Emine Yildirim
|
Stefania De Curtis, Stefano Moretti, Kei Yagyu and Emine Yildirim
|
LHC Phenomenology of Composite 2-Higgs Doublet Models
|
28 pages, 10 figures
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We investigate the phenomenology of Composite 2-Higgs Doublet Models (C2HDMs)
of various Yukawa types based on the global symmetry breaking $SO(6)\to
SO(4)\times SO(2)$. The kinetic term and the Yukawa Lagrangian are constructed
in terms of the pseudo Nambu-Goldstone Boson (pNGB) matrix and a 6-plet of
fermions under $SO(6)$. The scalar potential is assumed to be the same as that
of the Elementary 2-Higgs Doublet Model (E2HDM) with a softly-broken discrete
$Z_2$ symmetry. We then discuss the phenomenological differences between the
E2HDM and C2HDM by focusing on the deviations from Standard Model (SM)
couplings of the discovered Higgs state ($h$) as well as on the production
cross sections and Branching Ratios (BRs) at the Large Hadron Collider (LHC) of
extra Higgs bosons. We find that, even if the same deviation in the $hVV$
($V=W,Z$) coupling is assumed in both scenarios, there appear significant
differences between E2HDM and C2HDM from the structure of the Yukawa couplings,
so that production and decay features of extra Higgs bosons can be used to
distinguish between the two scenarios.
|
[
{
"created": "Sun, 9 Oct 2016 15:38:13 GMT",
"version": "v1"
},
{
"created": "Sun, 26 Feb 2017 13:59:52 GMT",
"version": "v2"
},
{
"created": "Mon, 26 Jun 2017 15:19:57 GMT",
"version": "v3"
}
] |
2017-06-27
|
[
[
"De Curtis",
"Stefania",
""
],
[
"Moretti",
"Stefano",
""
],
[
"Yagyu",
"Kei",
""
],
[
"Yildirim",
"Emine",
""
]
] |
We investigate the phenomenology of Composite 2-Higgs Doublet Models (C2HDMs) of various Yukawa types based on the global symmetry breaking $SO(6)\to SO(4)\times SO(2)$. The kinetic term and the Yukawa Lagrangian are constructed in terms of the pseudo Nambu-Goldstone Boson (pNGB) matrix and a 6-plet of fermions under $SO(6)$. The scalar potential is assumed to be the same as that of the Elementary 2-Higgs Doublet Model (E2HDM) with a softly-broken discrete $Z_2$ symmetry. We then discuss the phenomenological differences between the E2HDM and C2HDM by focusing on the deviations from Standard Model (SM) couplings of the discovered Higgs state ($h$) as well as on the production cross sections and Branching Ratios (BRs) at the Large Hadron Collider (LHC) of extra Higgs bosons. We find that, even if the same deviation in the $hVV$ ($V=W,Z$) coupling is assumed in both scenarios, there appear significant differences between E2HDM and C2HDM from the structure of the Yukawa couplings, so that production and decay features of extra Higgs bosons can be used to distinguish between the two scenarios.
|
1111.6850
|
George Rupp
|
George Rupp, Susana Coito, Eef van Beveren
|
Towards Meson Spectroscopy Instead of Bump Hunting
|
Invited seminar given by G. Rupp at the International School of
Nuclear Physics, 33rd course: "From Quarks and Gluons to Hadrons and Nuclei",
Erice, Sicily, Italy, 16 - 24 September 2011; 7 pages, 5 figures (9 plots),
style of Progress in Particle and Nuclear Physics
|
Prog. Part. Nucl. Phys. 67 (2012) 449
|
10.1016/j.ppnp.2012.01.009
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Mesonic resonances are generally observed in data as narrow, moderately
broad, or wide peaks in scattering or production processes. In the eyes of
nearly all experimentalists, any suchlike bump is a true resonance as soon as
its statistical significance exceeds certain minimal values. However, this
simple point of view ignores possible effects from competing hadronic channels
and the opening of the corresponding thresholds. On the other hand, most
theoretical hadron-model builders consider mesons merely bound states of a
quark and an antiquark, or of more exotic combinations sometimes involving
valence gluons as well. Also the latter description is much too naive, since
considerable mass shifts or even the dynamical generation of extra states due
to unquenching are equally ignored.
In the present paper, a largely empirical yet very successful approach to
meson spectroscopy is revisited, in which all the above phenomena can be
accounted for non-perturbatively, with concrete examples of some enigmatic
mesonic states described in detail. First, the X(4260) charmonium enhancement
is argued to be a non-resonant structure resulting from depletion effects due
to competing channels and resonances. Then, the X(3872) charmonium-like meson
is described as a unitarised $J^{PC}=1^{++}$ $c\bar{c}$ state. Also, the
unusual pattern of masses and widths of the open-charm axial-vector mesons
$D_1(2420)$, $D_1(2430)$, $D_{s1}(2536)$, and $D_{s1}(2460)$ is shown to follow
from highly non-perturbative coupled-channel and mixing effects. Finally, first
indications of a very light scalar boson are presented, on the basis of
published BABAR data.
|
[
{
"created": "Tue, 29 Nov 2011 15:29:28 GMT",
"version": "v1"
}
] |
2015-06-03
|
[
[
"Rupp",
"George",
""
],
[
"Coito",
"Susana",
""
],
[
"van Beveren",
"Eef",
""
]
] |
Mesonic resonances are generally observed in data as narrow, moderately broad, or wide peaks in scattering or production processes. In the eyes of nearly all experimentalists, any suchlike bump is a true resonance as soon as its statistical significance exceeds certain minimal values. However, this simple point of view ignores possible effects from competing hadronic channels and the opening of the corresponding thresholds. On the other hand, most theoretical hadron-model builders consider mesons merely bound states of a quark and an antiquark, or of more exotic combinations sometimes involving valence gluons as well. Also the latter description is much too naive, since considerable mass shifts or even the dynamical generation of extra states due to unquenching are equally ignored. In the present paper, a largely empirical yet very successful approach to meson spectroscopy is revisited, in which all the above phenomena can be accounted for non-perturbatively, with concrete examples of some enigmatic mesonic states described in detail. First, the X(4260) charmonium enhancement is argued to be a non-resonant structure resulting from depletion effects due to competing channels and resonances. Then, the X(3872) charmonium-like meson is described as a unitarised $J^{PC}=1^{++}$ $c\bar{c}$ state. Also, the unusual pattern of masses and widths of the open-charm axial-vector mesons $D_1(2420)$, $D_1(2430)$, $D_{s1}(2536)$, and $D_{s1}(2460)$ is shown to follow from highly non-perturbative coupled-channel and mixing effects. Finally, first indications of a very light scalar boson are presented, on the basis of published BABAR data.
|
1112.5976
|
Chun-Yu Cui
|
Chun-Yu Cui, Yong-Lu Liu, Guo-Bin Zhang and Ming-Qiu Huang
|
Can X(3872) be a $J^{P}=2^{-}$ tetraquark state?
|
7 pages, 3 figures, to appear in Commun.Theor.Phys
|
Commun.Theor.Phys.57 (2012) 1033-1036
|
10.1088/0253-6102/57/6/15
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this article, we test the nature of X(3872), which is assumed to be a
P-wave $[cq]$-scalar-diquark $[\bar{c}\bar{q}]$-axial-vector-antidiquark
tetraquark state with $J^{P}=2^{-}$. The interpolating current representing the
$J^{P}=2^{-}$ state is proposed. Technically, contributions of the operators up
to dimension six are included in the operator product expansion (OPE). The mass
obtained for such state is $m_{2^{-}}=(4.38\pm 0.15) GeV$. We conclude that it
is impossible to describe the X(3872) structure as $J^{P}=2^{-}$ tetraquark
state.
|
[
{
"created": "Tue, 27 Dec 2011 15:36:17 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Apr 2012 14:35:16 GMT",
"version": "v2"
}
] |
2015-06-03
|
[
[
"Cui",
"Chun-Yu",
""
],
[
"Liu",
"Yong-Lu",
""
],
[
"Zhang",
"Guo-Bin",
""
],
[
"Huang",
"Ming-Qiu",
""
]
] |
In this article, we test the nature of X(3872), which is assumed to be a P-wave $[cq]$-scalar-diquark $[\bar{c}\bar{q}]$-axial-vector-antidiquark tetraquark state with $J^{P}=2^{-}$. The interpolating current representing the $J^{P}=2^{-}$ state is proposed. Technically, contributions of the operators up to dimension six are included in the operator product expansion (OPE). The mass obtained for such state is $m_{2^{-}}=(4.38\pm 0.15) GeV$. We conclude that it is impossible to describe the X(3872) structure as $J^{P}=2^{-}$ tetraquark state.
|
1511.00724
|
Rodrigo Alonso Dr
|
Rodrigo Alonso, Elizabeth E. Jenkins and Aneesh V. Manohar
|
A Geometric Formulation of Higgs Effective Field Theory: Measuring the
Curvature of Scalar Field Space
|
Journal version. The introduction has been rewritten to make clearer
the distinction between SM, SMEFT and HEFT. A slight change of notation has
been introduced to connect observables with sectional curvature
| null |
10.1016/j.physletb.2016.01.041
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A geometric formulation of Higgs Effective Field Theory (HEFT) is presented.
Experimental observables are given in terms of geometric invariants of the
scalar sigma model sector such as the curvature of the scalar field manifold
$\mathcal M$. We show how the curvature can be measured experimentally via
Higgs cross-sections, $W_L$ scattering, and the $S$ parameter. The one-loop
action of HEFT is given in terms of geometric invariants of $\mathcal M$. The
distinction between the Standard Model (SM) and HEFT is whether $\mathcal M$ is
flat or curved, not whether the scalars transform linearly or non-linearly
under the electroweak group.
|
[
{
"created": "Mon, 2 Nov 2015 22:00:30 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Feb 2016 10:52:02 GMT",
"version": "v2"
}
] |
2016-02-04
|
[
[
"Alonso",
"Rodrigo",
""
],
[
"Jenkins",
"Elizabeth E.",
""
],
[
"Manohar",
"Aneesh V.",
""
]
] |
A geometric formulation of Higgs Effective Field Theory (HEFT) is presented. Experimental observables are given in terms of geometric invariants of the scalar sigma model sector such as the curvature of the scalar field manifold $\mathcal M$. We show how the curvature can be measured experimentally via Higgs cross-sections, $W_L$ scattering, and the $S$ parameter. The one-loop action of HEFT is given in terms of geometric invariants of $\mathcal M$. The distinction between the Standard Model (SM) and HEFT is whether $\mathcal M$ is flat or curved, not whether the scalars transform linearly or non-linearly under the electroweak group.
|
2110.05104
|
Mathieu Pellen
|
Michal Czakon, Alexander Mitov, Mathieu Pellen, Rene Poncelet
|
W+c-jet production at the LHC with NNLO QCD accuracy
|
6 pages, 5 pdf figures. Contribution to the Proceedings of RADCOR
2021 (15th International Symposium on Radiative Corrections: Applications of
Quantum Field Theory to Phenomenology)
| null | null |
FR-PHENO-2021-13
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In these proceedings, we highlight some aspects of the recent computation of
NNLO QCD corrections for W production in association with a charm jet at the
LHC. The results are presented in the form of cross sections and differential
distributions and are compared to ATLAS data.
|
[
{
"created": "Mon, 11 Oct 2021 09:13:27 GMT",
"version": "v1"
}
] |
2021-10-12
|
[
[
"Czakon",
"Michal",
""
],
[
"Mitov",
"Alexander",
""
],
[
"Pellen",
"Mathieu",
""
],
[
"Poncelet",
"Rene",
""
]
] |
In these proceedings, we highlight some aspects of the recent computation of NNLO QCD corrections for W production in association with a charm jet at the LHC. The results are presented in the form of cross sections and differential distributions and are compared to ATLAS data.
|
1405.2368
|
Kei Yagyu
|
Hiroshi Okada, and Kei Yagyu
|
Radiative Generation of Lepton Masses with the $U(1)'$ Gauge Symmetry
|
23 pages, 14 figures
|
Phys. Rev. D 90, 035019 (2014)
|
10.1103/PhysRevD.90.035019
|
KIAS-P14032
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We revisit our previous model proposed in Ref. \cite{Okada:2013iba}, in which
lepton masses except the tauon mass are generated at the one-loop level in a
TeV scale physics. Although in the previous work, rather large Yukawa couplings
constants; i.e., greater than about 3, are required to reproduce the muon mass,
we do not need to introduce such a large but ${\cal O}$(1) couplings. In our
model, masses for neutrinos (charged-leptons) are generated by a dimension five
effective operator with two isospin triplet (singlet and doublet) scalar
fields. Thus, the mass hierarchy between neutrinos and charged-leptons can be
naturally described by the difference in the number of vacuum expectation
values (VEVs) of the triplet fields which must be much smaller than the VEV of
the doublet field due to the constraint from the electroweak rho parameter.
Furthermore, the discrepancy in the measured muon anomalous magnetic moment
($g-2$) from the prediction in the standard model are explained by one-loop
contributions from vector-like extra charged-leptons which are necessary to
obtain the radiative generation of the lepton masses. We study the decay
property of the extra leptons by taking into account the masses of muon,
neutrinos, muon $g-2$ and dark matter physics. We find that the extra leptons
can mainly decay into the mono-muon, dark matter with or without $Z$ bosons in
the favored parameter regions.
|
[
{
"created": "Fri, 9 May 2014 23:20:47 GMT",
"version": "v1"
}
] |
2014-08-27
|
[
[
"Okada",
"Hiroshi",
""
],
[
"Yagyu",
"Kei",
""
]
] |
We revisit our previous model proposed in Ref. \cite{Okada:2013iba}, in which lepton masses except the tauon mass are generated at the one-loop level in a TeV scale physics. Although in the previous work, rather large Yukawa couplings constants; i.e., greater than about 3, are required to reproduce the muon mass, we do not need to introduce such a large but ${\cal O}$(1) couplings. In our model, masses for neutrinos (charged-leptons) are generated by a dimension five effective operator with two isospin triplet (singlet and doublet) scalar fields. Thus, the mass hierarchy between neutrinos and charged-leptons can be naturally described by the difference in the number of vacuum expectation values (VEVs) of the triplet fields which must be much smaller than the VEV of the doublet field due to the constraint from the electroweak rho parameter. Furthermore, the discrepancy in the measured muon anomalous magnetic moment ($g-2$) from the prediction in the standard model are explained by one-loop contributions from vector-like extra charged-leptons which are necessary to obtain the radiative generation of the lepton masses. We study the decay property of the extra leptons by taking into account the masses of muon, neutrinos, muon $g-2$ and dark matter physics. We find that the extra leptons can mainly decay into the mono-muon, dark matter with or without $Z$ bosons in the favored parameter regions.
|
2207.10913
|
Xabier Marcano
|
Lorenzo Calibbi, Tong Li, Xabier Marcano, Michael A. Schmidt
|
Indirect constraints on lepton-flavour-violating quarkonium decays
|
21 pages + appendices. 6 figures, 6 tables. Version to appear in PRD
| null |
10.1103/PhysRevD.106.115039
|
CPPC-2022-08, IFT-UAM/CSIC-22-82
|
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
Within an effective-field-theory framework, we present a model-independent
analysis of the potential of discovering new physics by searching for lepton
flavour violation in heavy quarkonium decays and, more in general, we study the
phenomenology of lepton-flavour-violating (LFV) 2 quark - 2 lepton ($2q2\ell$)
operators with two charm or bottom fields. We compute the constraints from LFV
muon and tau decays on the new-physics operators that can induce LFV processes
involving $c\bar c$ and $b\bar b$ systems, thus providing a comprehensive list
of indirect upper limits on processes such as $J/\psi \to \ell\ell^\prime$,
$\Upsilon(nS) \to \ell\ell^\prime$, $\Upsilon(nS) \to \ell\ell^\prime \gamma$
etc., which can be sought at BESIII, Belle II, and the proposed super tau-charm
factory. We show that such indirect constraints are so stringent that they
prevent the detection of quarkonium decays into $e\mu$. In the case of decays
of quarkonia into $\ell\tau$ ($\ell=e,\mu$), we find that an improvement by 2-3
orders of magnitude on the current sensitivities is in general required in
order to discover or further constrain new physics. However, we show that
cancellations among different contributions to the LFV tau decay rates are
possible, such that $\Upsilon(nS)\to \ell\tau$ can saturate the present
experimental bounds. We also find that, interestingly, searches for LFV $Z$
decays, $Z\to\ell\tau$, at future $e^+e^-$ colliders are complementary probes
of $2q2\ell$ operators with third generation quarks.
|
[
{
"created": "Fri, 22 Jul 2022 07:15:00 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Dec 2022 10:43:34 GMT",
"version": "v2"
}
] |
2023-01-11
|
[
[
"Calibbi",
"Lorenzo",
""
],
[
"Li",
"Tong",
""
],
[
"Marcano",
"Xabier",
""
],
[
"Schmidt",
"Michael A.",
""
]
] |
Within an effective-field-theory framework, we present a model-independent analysis of the potential of discovering new physics by searching for lepton flavour violation in heavy quarkonium decays and, more in general, we study the phenomenology of lepton-flavour-violating (LFV) 2 quark - 2 lepton ($2q2\ell$) operators with two charm or bottom fields. We compute the constraints from LFV muon and tau decays on the new-physics operators that can induce LFV processes involving $c\bar c$ and $b\bar b$ systems, thus providing a comprehensive list of indirect upper limits on processes such as $J/\psi \to \ell\ell^\prime$, $\Upsilon(nS) \to \ell\ell^\prime$, $\Upsilon(nS) \to \ell\ell^\prime \gamma$ etc., which can be sought at BESIII, Belle II, and the proposed super tau-charm factory. We show that such indirect constraints are so stringent that they prevent the detection of quarkonium decays into $e\mu$. In the case of decays of quarkonia into $\ell\tau$ ($\ell=e,\mu$), we find that an improvement by 2-3 orders of magnitude on the current sensitivities is in general required in order to discover or further constrain new physics. However, we show that cancellations among different contributions to the LFV tau decay rates are possible, such that $\Upsilon(nS)\to \ell\tau$ can saturate the present experimental bounds. We also find that, interestingly, searches for LFV $Z$ decays, $Z\to\ell\tau$, at future $e^+e^-$ colliders are complementary probes of $2q2\ell$ operators with third generation quarks.
|
1609.02110
|
Emanuel Gallo
|
Emanuel Gallo and Osvaldo M. Moreschi
|
Constructing balanced equations of motion for particles in general
relativistic theories: the general case
| null | null | null | null |
gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a general approach for the formulation of equations of motion for
compact objects in general relativistic theories. The particle is assumed to be
moving in a geometric background which in turn is asymptotically flat. Our
approach defines a model for particle like objects which emphasizes different
aspects of a set of gravitating objects; by concentrating in the main
contributions coming from back reaction effects due to gravitational radiation.
|
[
{
"created": "Wed, 7 Sep 2016 18:50:10 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Oct 2017 12:48:42 GMT",
"version": "v2"
},
{
"created": "Wed, 14 Mar 2018 14:09:11 GMT",
"version": "v3"
}
] |
2018-03-15
|
[
[
"Gallo",
"Emanuel",
""
],
[
"Moreschi",
"Osvaldo M.",
""
]
] |
We present a general approach for the formulation of equations of motion for compact objects in general relativistic theories. The particle is assumed to be moving in a geometric background which in turn is asymptotically flat. Our approach defines a model for particle like objects which emphasizes different aspects of a set of gravitating objects; by concentrating in the main contributions coming from back reaction effects due to gravitational radiation.
|
1501.07890
|
Andrea Tesi
|
Matthew Low, Andrea Tesi, Lian-Tao Wang
|
The Twin Higgs mechanism and Composite Higgs
|
28 pages, 4 figures, 3 tables; v2: added references and comments,
fixed typos, published in PRD
|
Phys. Rev. D 91, 095012 (2015)
|
10.1103/PhysRevD.91.095012
|
EFI-15-2
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We combine the Twin Higgs mechanism with the paradigm of Composite Higgs
models. In this class of models the Higgs is a pseudo-Nambu-Goldstone boson
from a strongly coupled sector near the TeV scale, and it is additionally
protected by a discrete symmetry due to the twin mechanism. We discuss the
model building issues associated with this setup and quantify the tuning needed
to achieve the correct electroweak vacuum and the Higgs mass. In contrast to
standard Composite Higgs models, the lightest resonance associated with the top
sector is the uncolored mirror top, while the colored top partners can be made
parameterically heavier without extra tuning. In some cases, the vector
resonances are predicted to lie in the multi-TeV range. We present models where
the resonances - both fermions and vectors - being heavier alleviates the
pressure on naturalness coming from direct searches demonstrating that theories
with low tuning may survive constraints from the Large Hadron Collider.
|
[
{
"created": "Fri, 30 Jan 2015 19:52:29 GMT",
"version": "v1"
},
{
"created": "Fri, 22 May 2015 06:17:32 GMT",
"version": "v2"
}
] |
2015-05-25
|
[
[
"Low",
"Matthew",
""
],
[
"Tesi",
"Andrea",
""
],
[
"Wang",
"Lian-Tao",
""
]
] |
We combine the Twin Higgs mechanism with the paradigm of Composite Higgs models. In this class of models the Higgs is a pseudo-Nambu-Goldstone boson from a strongly coupled sector near the TeV scale, and it is additionally protected by a discrete symmetry due to the twin mechanism. We discuss the model building issues associated with this setup and quantify the tuning needed to achieve the correct electroweak vacuum and the Higgs mass. In contrast to standard Composite Higgs models, the lightest resonance associated with the top sector is the uncolored mirror top, while the colored top partners can be made parameterically heavier without extra tuning. In some cases, the vector resonances are predicted to lie in the multi-TeV range. We present models where the resonances - both fermions and vectors - being heavier alleviates the pressure on naturalness coming from direct searches demonstrating that theories with low tuning may survive constraints from the Large Hadron Collider.
|
1904.00339
|
Yannis K. Semertzidis
|
Yuri F. Orlov, Eanna Flanagan, and Yannis K. Semertzidis
|
Spin Rotation by Earth's Gravitational Field in a "Frozen-Spin" Ring
|
25 pages, 1 figure
|
Physics Letters A 376 (2012) 2822-2829
|
10.1016/j.physleta.2012.08.011
| null |
gr-qc hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Detailed calculations of spin rotation by the Earth's gravitational field in
a frozen-spin ring are presented in three different coordinate systems and used
(a) to show that the systematic error caused by gravitation in a proposed
electric dipole moment measurement can be unambiguously determined, and (b) to
propose measuring the spin-gravity effect in a dedicated frozen-spin ring using
electrons.
|
[
{
"created": "Sun, 31 Mar 2019 04:28:58 GMT",
"version": "v1"
}
] |
2019-04-02
|
[
[
"Orlov",
"Yuri F.",
""
],
[
"Flanagan",
"Eanna",
""
],
[
"Semertzidis",
"Yannis K.",
""
]
] |
Detailed calculations of spin rotation by the Earth's gravitational field in a frozen-spin ring are presented in three different coordinate systems and used (a) to show that the systematic error caused by gravitation in a proposed electric dipole moment measurement can be unambiguously determined, and (b) to propose measuring the spin-gravity effect in a dedicated frozen-spin ring using electrons.
|
1605.08650
|
Mayer Humi
|
Mayer Humi and John Roumas
|
Spherical Isentropic Protostars in General Relativity
|
This version is a major revision of this paper. New title also.
Comments and feedback are welcome
| null | null | null |
gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the process of protostar formation, astrophysical gas clouds undergo
thermodynamically irreversible processes and emit heat and radiation to their
surroundings. Due the emission of this energy one can envision an idealized
situation in which the gas entropy remains nearly constant. In this setting, we
derive in this paper interior solutions to the Einstein equations of General
Relativity for spheres which consist of isentropic gas. To accomplish this
objective we derive a single equation for the cumulative mass distribution in
the protostar. From a solution of this equation one can infer readily the
coefficients of the metric tensor. In this paper we present analytic and
numerical solutions for the structure of the isentropic self-gravitating gas.
In particular we look for solutions in which the mass distribution indicates
the presence of shells, a possible precursor to solar system formation. Another
possible physical motivation for this research comes from the observation that
gamma ray bursts are accompanied by the ejection of large amounts of
thermodynamically active gas at relativistic velocities. Under these conditions
it is natural to use the equations of general relativity to inquire about the
structure of the ejected mass.
|
[
{
"created": "Fri, 27 May 2016 14:10:38 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Nov 2016 17:36:48 GMT",
"version": "v2"
}
] |
2016-11-22
|
[
[
"Humi",
"Mayer",
""
],
[
"Roumas",
"John",
""
]
] |
In the process of protostar formation, astrophysical gas clouds undergo thermodynamically irreversible processes and emit heat and radiation to their surroundings. Due the emission of this energy one can envision an idealized situation in which the gas entropy remains nearly constant. In this setting, we derive in this paper interior solutions to the Einstein equations of General Relativity for spheres which consist of isentropic gas. To accomplish this objective we derive a single equation for the cumulative mass distribution in the protostar. From a solution of this equation one can infer readily the coefficients of the metric tensor. In this paper we present analytic and numerical solutions for the structure of the isentropic self-gravitating gas. In particular we look for solutions in which the mass distribution indicates the presence of shells, a possible precursor to solar system formation. Another possible physical motivation for this research comes from the observation that gamma ray bursts are accompanied by the ejection of large amounts of thermodynamically active gas at relativistic velocities. Under these conditions it is natural to use the equations of general relativity to inquire about the structure of the ejected mass.
|
1905.02611
|
Jarmo M\"akel\"a Dr.
|
Jarmo M\"akel\"a
|
Wheeler's It from Bit Proposal in Loop Quantum Gravity
|
47 pages. Accepted for publication in the Int. J. Mod. Phys.D.
Comments welcome
| null |
10.1142/S0218271819501293
| null |
gr-qc astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
As an attempt to realize Wheeler's "it-from-bit proposal" that physics should
be reduced to simple yes-no questions we consider a model of loop quantum
gravity, where the only allowed values of the quantum numbers $j_p$ at the
punctures of the spin network on the spacelike two-surfaces of spacetime are
$0$ and $\frac{1}{2}$. When $j_p=0$, the puncture is in the vacuum, and it does
not contribute to the area of the two-surface, whereas when $j_p=\frac{1}{2}$,
the puncture is in an excited state, and the allowed values of the associated
quantum number $m_p$ are $-\frac{1}{2}$ and $+\frac{1}{2}$. As a consequence,
the spin network used as a model of spacetime is analogous to a system of
particles with spin $\frac{1}{2}$, and every puncture carries exactly one bit
of information. When applied to spacetimes with horizon our model enables us to
find an explicit expression for the partition function of spacetime. Using this
partition function we may, among other things, obtain the Bekenstein-Hawking
entropy law for black holes. When applied to cosmological models with horizon
the partition function predicts a cosmic phase transition in the early
Universe, where the cosmological constant went through a dramatic decrease and
the matter of the Universe was created out of the vacuum.
|
[
{
"created": "Mon, 6 May 2019 15:30:26 GMT",
"version": "v1"
}
] |
2019-08-07
|
[
[
"Mäkelä",
"Jarmo",
""
]
] |
As an attempt to realize Wheeler's "it-from-bit proposal" that physics should be reduced to simple yes-no questions we consider a model of loop quantum gravity, where the only allowed values of the quantum numbers $j_p$ at the punctures of the spin network on the spacelike two-surfaces of spacetime are $0$ and $\frac{1}{2}$. When $j_p=0$, the puncture is in the vacuum, and it does not contribute to the area of the two-surface, whereas when $j_p=\frac{1}{2}$, the puncture is in an excited state, and the allowed values of the associated quantum number $m_p$ are $-\frac{1}{2}$ and $+\frac{1}{2}$. As a consequence, the spin network used as a model of spacetime is analogous to a system of particles with spin $\frac{1}{2}$, and every puncture carries exactly one bit of information. When applied to spacetimes with horizon our model enables us to find an explicit expression for the partition function of spacetime. Using this partition function we may, among other things, obtain the Bekenstein-Hawking entropy law for black holes. When applied to cosmological models with horizon the partition function predicts a cosmic phase transition in the early Universe, where the cosmological constant went through a dramatic decrease and the matter of the Universe was created out of the vacuum.
|
2205.12983
|
Azadeh Maleknejad
|
Azadeh Maleknejad and Evan McDonough
|
Ultra-Light Pion and Baryon WIMPzilla Dark Matter
|
v2: ref added; minor change in the title according to the published
version
| null | null | null |
hep-ph astro-ph.CO gr-qc hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider a dark confining gauge theory with millicharged Ultra-Light Pions
(ULP) and heavy baryons as dark matter candidates. The model simultaneously
realizes the ultra-light (STrongly-interacting Ultralight Millicharged Particle
or "STUMP") and superheavy ("WIMPzilla") dark matter paradigms, connected by
the confinement scale of the dark QCD. It is a realization of millicharged
ULDM, very unlike conventional axions, and exhibits a mass splitting between
the charged and neutral pions. ULPs can easily provide the observed density of
the dark matter, and be cosmologically stable, for a broad range of dark QCD
scales and quark masses. The dark baryons, produced via gravitational particle
production or via freeze-in, provide an additional contribution to the dark
matter density. Dark matter halos and boson stars in this context are
generically an admixture of the three pions and heavy baryons, leading to a
diversity of density profiles. That opens up the accessible parameter space of
the model compared with the standard millicharged DM scenarios and can be
probed by future experiments. We briefly discuss additional interesting
phenomenology, such as ULP electrodynamics, and Cosmic ULP Backgrounds.
|
[
{
"created": "Wed, 25 May 2022 18:00:04 GMT",
"version": "v1"
},
{
"created": "Sun, 22 Oct 2023 16:24:13 GMT",
"version": "v2"
}
] |
2023-10-24
|
[
[
"Maleknejad",
"Azadeh",
""
],
[
"McDonough",
"Evan",
""
]
] |
We consider a dark confining gauge theory with millicharged Ultra-Light Pions (ULP) and heavy baryons as dark matter candidates. The model simultaneously realizes the ultra-light (STrongly-interacting Ultralight Millicharged Particle or "STUMP") and superheavy ("WIMPzilla") dark matter paradigms, connected by the confinement scale of the dark QCD. It is a realization of millicharged ULDM, very unlike conventional axions, and exhibits a mass splitting between the charged and neutral pions. ULPs can easily provide the observed density of the dark matter, and be cosmologically stable, for a broad range of dark QCD scales and quark masses. The dark baryons, produced via gravitational particle production or via freeze-in, provide an additional contribution to the dark matter density. Dark matter halos and boson stars in this context are generically an admixture of the three pions and heavy baryons, leading to a diversity of density profiles. That opens up the accessible parameter space of the model compared with the standard millicharged DM scenarios and can be probed by future experiments. We briefly discuss additional interesting phenomenology, such as ULP electrodynamics, and Cosmic ULP Backgrounds.
|
1309.1690
|
Astrid Eichhorn
|
Astrid Eichhorn and Tim Koslowski
|
Continuum limit in matrix models for quantum gravity from the Functional
Renormalization Group
|
16 pages, 3 figures
|
Phys. Rev. D 88, 084016 (2013)
|
10.1103/PhysRevD.88.084016
| null |
gr-qc hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider the double-scaling limit in matrix models for two-dimensional
quantum gravity, and establish the nonperturbative functional Renormalization
Group as a novel technique to compute the corresponding interacting fixed point
of the Renormalization Group flow. We explicitly evaluate critical exponents
and compare to the exact results. The functional Renormalization Group method
allows a generalization to tensor models for higher-dimensional quantum gravity
and to group field theories. As a simple example how this method works for such
models, we compute the leading-order beta function for a colored matrix model
that is inspired by recent developments in tensor models.
|
[
{
"created": "Fri, 6 Sep 2013 16:17:21 GMT",
"version": "v1"
}
] |
2013-10-30
|
[
[
"Eichhorn",
"Astrid",
""
],
[
"Koslowski",
"Tim",
""
]
] |
We consider the double-scaling limit in matrix models for two-dimensional quantum gravity, and establish the nonperturbative functional Renormalization Group as a novel technique to compute the corresponding interacting fixed point of the Renormalization Group flow. We explicitly evaluate critical exponents and compare to the exact results. The functional Renormalization Group method allows a generalization to tensor models for higher-dimensional quantum gravity and to group field theories. As a simple example how this method works for such models, we compute the leading-order beta function for a colored matrix model that is inspired by recent developments in tensor models.
|
1912.11909
|
Naveena Kumara A
|
A. Naveena Kumara, C.L. Ahmed Rizwan, Shreyas Punacha, Ajith K.M. and
Md Sabir Ali
|
Photon Orbits and Thermodynamic Phase Transition of Regular AdS Black
Holes
|
Thoroughly revised. 12 pages, 11 figures
|
Phys. Rev. D 102, 084059 (2020)
|
10.1103/PhysRevD.102.084059
| null |
gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We probe the phase structure of the regular AdS black holes using the null
geodesics. The radius of photon orbit and minimum impact parameter shows a
non-monotonous behaviour below the critical values of the temperature and the
pressure, corresponding to the phase transition in extended phase space. The
respective differences of the radius of unstable circular orbit and the minimum
impact parameter can be seen as the order parameter for the small-large black
hole phase transition, with a critical exponent $1/2$. Our study shows that
there exists a close relationship between the gravity and thermodynamics for
the regular AdS black holes.
|
[
{
"created": "Thu, 26 Dec 2019 18:15:12 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Sep 2020 06:47:59 GMT",
"version": "v2"
}
] |
2020-11-04
|
[
[
"Kumara",
"A. Naveena",
""
],
[
"Rizwan",
"C. L. Ahmed",
""
],
[
"Punacha",
"Shreyas",
""
],
[
"M.",
"Ajith K.",
""
],
[
"Ali",
"Md Sabir",
""
]
] |
We probe the phase structure of the regular AdS black holes using the null geodesics. The radius of photon orbit and minimum impact parameter shows a non-monotonous behaviour below the critical values of the temperature and the pressure, corresponding to the phase transition in extended phase space. The respective differences of the radius of unstable circular orbit and the minimum impact parameter can be seen as the order parameter for the small-large black hole phase transition, with a critical exponent $1/2$. Our study shows that there exists a close relationship between the gravity and thermodynamics for the regular AdS black holes.
|
1410.5753
|
Peihong Gu
|
Pei-Hong Gu
|
A new leptogenesis scenario parametrized by Dirac neutrino mass matrix
|
8 pages, 3 figures. Basic idea and results are unchanged while model
and demonstrations are improved
|
Phys. Rev. D 96, 075024 (2017)
|
10.1103/PhysRevD.96.075024
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In an $SU(3)_{c}\times SU(2)_{L}\times SU(2)_{R}\times U(1)_{B-L}$ left-right
symmetric framework, we present a new leptogenesis scenario parametrized by
Dirac neutrino mass matrix. Benefited from the parity symmetry motivated to
solve the strong CP problem, the dimensionless couplings of the mirror fields
are identified to those of the ordinary fields. In particular, the mirror Dirac
neutrinos have a heavy mass matrix proportional to the light mass matrix of the
ordinary Dirac neutrinos. Through the $SU(2)_R$ gauge interactions, the mirror
neutrinos can decay to generate a lepton asymmetry in the mirror muons and an
opposite lepton asymmetry in the mirror electrons. Before the $SU(2)_L$
sphaleron processes stop working, the mirror muons can efficiently decay into
the ordinary right-handed leptons with a dark matter scalar and hence the
mirror muon asymmetry can be partially converted to a desired baryon asymmetry.
|
[
{
"created": "Tue, 21 Oct 2014 17:39:57 GMT",
"version": "v1"
},
{
"created": "Mon, 15 May 2017 10:40:35 GMT",
"version": "v2"
}
] |
2017-10-25
|
[
[
"Gu",
"Pei-Hong",
""
]
] |
In an $SU(3)_{c}\times SU(2)_{L}\times SU(2)_{R}\times U(1)_{B-L}$ left-right symmetric framework, we present a new leptogenesis scenario parametrized by Dirac neutrino mass matrix. Benefited from the parity symmetry motivated to solve the strong CP problem, the dimensionless couplings of the mirror fields are identified to those of the ordinary fields. In particular, the mirror Dirac neutrinos have a heavy mass matrix proportional to the light mass matrix of the ordinary Dirac neutrinos. Through the $SU(2)_R$ gauge interactions, the mirror neutrinos can decay to generate a lepton asymmetry in the mirror muons and an opposite lepton asymmetry in the mirror electrons. Before the $SU(2)_L$ sphaleron processes stop working, the mirror muons can efficiently decay into the ordinary right-handed leptons with a dark matter scalar and hence the mirror muon asymmetry can be partially converted to a desired baryon asymmetry.
|
1407.0383
|
Yan-Qing Ma
|
Yan-Qing Ma, Jian-Wei Qiu, George Sterman, Hong Zhang
|
Factorized power expansion for high-$p_T$ heavy quarkonium production
|
5 pages, 3 figures, version published in Physical Review Letters
|
Phys. Rev. Lett. 113, 142002 (2014)
|
10.1103/PhysRevLett.113.142002
|
YITP-SB-14-19
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show that when the factorized cross section for heavy quarkonium
production includes next-to-leading power (NLP) contributions associated with
the production of the heavy quark pair at short distances, it naturally
reproduces all high $p_T$ results calculated in non-relativistic QCD (NRQCD)
factorization. This extended formalism requires fragmentation functions for
heavy quark pairs, as well as for light partons. When these fragmentation
functions are themselves calculated using NRQCD, we find that two of the four
leading NRQCD production channels, ${^3\hspace{-0.6mm}S_{1}^{[1]}}$ and
${^1\hspace{-0.6mm}S_{0}^{[8]}}$, are dominated by the NLP contributions for a
very wide $p_T$ range. The large next-to-leading order corrections of NRQCD are
absorbed into the leading order of the first power correction. The impact of
this finding on the heavy quarkonium production and its polarization is
discussed.
|
[
{
"created": "Tue, 1 Jul 2014 19:53:58 GMT",
"version": "v1"
},
{
"created": "Sat, 11 Oct 2014 04:08:43 GMT",
"version": "v2"
}
] |
2014-10-14
|
[
[
"Ma",
"Yan-Qing",
""
],
[
"Qiu",
"Jian-Wei",
""
],
[
"Sterman",
"George",
""
],
[
"Zhang",
"Hong",
""
]
] |
We show that when the factorized cross section for heavy quarkonium production includes next-to-leading power (NLP) contributions associated with the production of the heavy quark pair at short distances, it naturally reproduces all high $p_T$ results calculated in non-relativistic QCD (NRQCD) factorization. This extended formalism requires fragmentation functions for heavy quark pairs, as well as for light partons. When these fragmentation functions are themselves calculated using NRQCD, we find that two of the four leading NRQCD production channels, ${^3\hspace{-0.6mm}S_{1}^{[1]}}$ and ${^1\hspace{-0.6mm}S_{0}^{[8]}}$, are dominated by the NLP contributions for a very wide $p_T$ range. The large next-to-leading order corrections of NRQCD are absorbed into the leading order of the first power correction. The impact of this finding on the heavy quarkonium production and its polarization is discussed.
|
2212.02218
|
Song Mao
|
Xiao-Hui Mei, Zhuo Yu, Mao Song, Jian-You Guo, Gang Li, Xuan Luo
|
Explanation of Y(4630) as hadronic resonant state
|
8 pages, 9 figures, accepted by Chinese Physics C
| null |
10.1088/1674-1137/aca959
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
After Y(4630) is discovered, theorists have given various explanations. We
find that if Y(4630) is interpreted as the D-wave resonant state of $\Lambda_c
\bar {\Lambda}_c$ system, the particle mass, decay width and all quantum
numbers are consistent with experimental observations. We use the Bonn
approximation to get the interaction potential of one boson exchange model,
then extend the complex scaling method (CSM) to calculate the bound and
resonant states. The results indicate that the $\Lambda_c \bar{\Lambda}_c$
system can form not only the bound state of S wave, but also the resonant state
of the high angular momentum, and the $^3D_1$ wave resonant state can explain
the structure of Y(4630) very well.
|
[
{
"created": "Mon, 5 Dec 2022 12:50:21 GMT",
"version": "v1"
}
] |
2023-02-22
|
[
[
"Mei",
"Xiao-Hui",
""
],
[
"Yu",
"Zhuo",
""
],
[
"Song",
"Mao",
""
],
[
"Guo",
"Jian-You",
""
],
[
"Li",
"Gang",
""
],
[
"Luo",
"Xuan",
""
]
] |
After Y(4630) is discovered, theorists have given various explanations. We find that if Y(4630) is interpreted as the D-wave resonant state of $\Lambda_c \bar {\Lambda}_c$ system, the particle mass, decay width and all quantum numbers are consistent with experimental observations. We use the Bonn approximation to get the interaction potential of one boson exchange model, then extend the complex scaling method (CSM) to calculate the bound and resonant states. The results indicate that the $\Lambda_c \bar{\Lambda}_c$ system can form not only the bound state of S wave, but also the resonant state of the high angular momentum, and the $^3D_1$ wave resonant state can explain the structure of Y(4630) very well.
|
0906.1646
|
Dmitry Zhuridov
|
Chuan-Hung Chen, Chao-Qiang Geng and Dmitry V. Zhuridov
|
Neutrino Masses, Leptogenesis and Decaying Dark Matter
|
11 pages, 5 figures; revised version
|
JCAP 0910:001,2009
|
10.1088/1475-7516/2009/10/001
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study a simple extension of the standard model to simultaneously explain
neutrino masses, dark matter and the matter-antimatter asymmetry of the
Universe. In our model, the baryon asymmetry is achieved by the leptogenesis
mechanism, while the decaying dark matter with the lifetime of O(10^26 s)
provides a natural solution to the electron and positron excesses in Fermi and
PAMELA satellite experiments. In particular, we emphasize that our model is
sensitive to the structure at the endpoint around 1 TeV of the Fermi data. In
addition, some of new particles proposed in the model are within the reach at
the near future colliders, such as the Large Hadron Collider.
|
[
{
"created": "Tue, 9 Jun 2009 07:12:03 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Jun 2009 05:10:18 GMT",
"version": "v2"
}
] |
2010-03-26
|
[
[
"Chen",
"Chuan-Hung",
""
],
[
"Geng",
"Chao-Qiang",
""
],
[
"Zhuridov",
"Dmitry V.",
""
]
] |
We study a simple extension of the standard model to simultaneously explain neutrino masses, dark matter and the matter-antimatter asymmetry of the Universe. In our model, the baryon asymmetry is achieved by the leptogenesis mechanism, while the decaying dark matter with the lifetime of O(10^26 s) provides a natural solution to the electron and positron excesses in Fermi and PAMELA satellite experiments. In particular, we emphasize that our model is sensitive to the structure at the endpoint around 1 TeV of the Fermi data. In addition, some of new particles proposed in the model are within the reach at the near future colliders, such as the Large Hadron Collider.
|
1007.4449
|
Jeppe R. Andersen
|
Jeppe R. Andersen (CERN) and Jennifer M. Smillie (UCL)
|
High Energy Description of Processes with Multiple Hard Jets
|
Talk presented at Loop and Legs in Quantum Field Theory, W\"{o}rlitz,
Germany, 25th-30th April 2010
|
Nucl.Phys.Proc.Suppl.205-206:205-210,2010
|
10.1016/j.nuclphysbps.2010.08.044
|
CERN-PH-TH/2010-167
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
High Energy Jets (HEJ) is a new framework for approximating the all-order
perturbative corrections to multi-jet processes, with a focus on the hard,
wide-angle QCD emissions, which underpins the perturbative description of hard
jets. In this contribution we review the basic concepts of HEJ, and present
some new predictions for observables in dijet-production, and for W-boson
production in association with at least 3 jets.
|
[
{
"created": "Mon, 26 Jul 2010 13:20:19 GMT",
"version": "v1"
}
] |
2010-12-13
|
[
[
"Andersen",
"Jeppe R.",
"",
"CERN"
],
[
"Smillie",
"Jennifer M.",
"",
"UCL"
]
] |
High Energy Jets (HEJ) is a new framework for approximating the all-order perturbative corrections to multi-jet processes, with a focus on the hard, wide-angle QCD emissions, which underpins the perturbative description of hard jets. In this contribution we review the basic concepts of HEJ, and present some new predictions for observables in dijet-production, and for W-boson production in association with at least 3 jets.
|
1602.07099
|
Pouya Bakhti
|
Pouya Bakhti and Yasaman Farzan
|
CP-Violation and Non-Standard Interactions at the MOMENT
|
15 pages, 6 figures
| null |
10.1007/JHEP07(2016)109
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
To measure the last unknown $3\nu$ oscillation parameter ($\delta$), several
long baseline neutrino experiments have been designed or proposed. Recently it
has been shown that turning on neutral current Non-Standard Interactions (NSI)
of neutrinos with matter can induce degeneracies that may even hinder the
proposed state-of-the-art DUNE long baseline experiment from measuring the
value of $\delta$. We study how the result of the proposed MOMENT experiment
with a baseline of 150 km and $200~{\rm MeV}<E_\nu<600~{\rm MeV}$ can help to
solve the degeneracy induced by NSI and determine the true value of $\delta$.
|
[
{
"created": "Tue, 23 Feb 2016 09:34:25 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Dec 2016 14:35:05 GMT",
"version": "v2"
}
] |
2016-12-08
|
[
[
"Bakhti",
"Pouya",
""
],
[
"Farzan",
"Yasaman",
""
]
] |
To measure the last unknown $3\nu$ oscillation parameter ($\delta$), several long baseline neutrino experiments have been designed or proposed. Recently it has been shown that turning on neutral current Non-Standard Interactions (NSI) of neutrinos with matter can induce degeneracies that may even hinder the proposed state-of-the-art DUNE long baseline experiment from measuring the value of $\delta$. We study how the result of the proposed MOMENT experiment with a baseline of 150 km and $200~{\rm MeV}<E_\nu<600~{\rm MeV}$ can help to solve the degeneracy induced by NSI and determine the true value of $\delta$.
|
1704.06480
|
Fayyazuddin Fayyazuddin
|
Fayyazuddin
|
Two Body Hadronic Decays $\Lambda_{b}(\frac{1}{2}^{+})\rightarrow
B^{\ast}(\frac{3}{2}^{+})+P$ in a quark model
|
No Figure, 10 pages, A version that appeared in the Physics Review D
|
Phys.Rev. D95 (2017) no.5, 053008
| null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The framework under which decays $\Lambda_{b}(\frac{1}{2}^{+})\rightarrow
B(\frac{1}{2}^{+})+M$ are analyzed is not applicable for the decays
$\Lambda_{b}(\frac{1}{2}^{+})\rightarrow B^{\ast}(\frac{3}{2} ^{+})+M$. These
decays occur through a baryon pole $\Sigma^{0}_{c}$ which is generated by the
W-exchange diagram in the process $b+u \xrightarrow {W} c+d$. The effective
Hamiltonian which arises from the W-exchange diagram is expressed in the non
relativistic limit. Since $% \Sigma^{0}_{c}$ belongs to representation $6$ of
SU(3), it contributes to two sets of decays:
$\Lambda_{b}\rightarrow\Delta^{0}D^{0},\Delta^{-}D^{+},% \Sigma^{*-}D_s^{+}$
and $\Lambda_{b}\rightarrow\Sigma^{\ast-}_{c}\pi^{+},%
\Sigma^{\ast 0}_{c}\pi^{0}\;, \Xi^{\ast 0}_{c}K^{0}$. The branching ratios
for these decays are evaluated which can be compared with their experimental
values when the data become available. Other prediction of the model is that
asymmetry parameter $\alpha = 0$, since baryon pole contributes to parity
conserving (p-wave) amplitude and does not contribute to parity violating
(d-wave) amplitude.
|
[
{
"created": "Fri, 21 Apr 2017 11:04:26 GMT",
"version": "v1"
}
] |
2017-04-24
|
[
[
"Fayyazuddin",
"",
""
]
] |
The framework under which decays $\Lambda_{b}(\frac{1}{2}^{+})\rightarrow B(\frac{1}{2}^{+})+M$ are analyzed is not applicable for the decays $\Lambda_{b}(\frac{1}{2}^{+})\rightarrow B^{\ast}(\frac{3}{2} ^{+})+M$. These decays occur through a baryon pole $\Sigma^{0}_{c}$ which is generated by the W-exchange diagram in the process $b+u \xrightarrow {W} c+d$. The effective Hamiltonian which arises from the W-exchange diagram is expressed in the non relativistic limit. Since $% \Sigma^{0}_{c}$ belongs to representation $6$ of SU(3), it contributes to two sets of decays: $\Lambda_{b}\rightarrow\Delta^{0}D^{0},\Delta^{-}D^{+},% \Sigma^{*-}D_s^{+}$ and $\Lambda_{b}\rightarrow\Sigma^{\ast-}_{c}\pi^{+},% \Sigma^{\ast 0}_{c}\pi^{0}\;, \Xi^{\ast 0}_{c}K^{0}$. The branching ratios for these decays are evaluated which can be compared with their experimental values when the data become available. Other prediction of the model is that asymmetry parameter $\alpha = 0$, since baryon pole contributes to parity conserving (p-wave) amplitude and does not contribute to parity violating (d-wave) amplitude.
|
hep-ph/9908372
|
Krzysztof Redlich
|
R. Baier (U. Bielefeld), K. Redlich (U. Wroclaw)
|
Hard-thermal-loop resummed pressure of a degenerate quark-gluon plasma
|
6 pages, 2 figures
|
Phys.Rev.Lett. 84 (2000) 2100-2103
|
10.1103/PhysRevLett.84.2100
| null |
hep-ph
| null |
We compute the pressure of a finite density quark-gluon plasma at zero
temperature to leading order in hard-thermal-loop perturbation theory, which
includes the fermionic excitations and Landau damping. The result is compared
with the weak-coupling expansion for finite positive chemical potential $\mu$
through order $\alpha_s^2$ and with a quasiparticle model with a mass depending
on $\mu$.
|
[
{
"created": "Mon, 16 Aug 1999 17:50:51 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Aug 1999 13:54:23 GMT",
"version": "v2"
},
{
"created": "Fri, 22 Oct 1999 10:06:37 GMT",
"version": "v3"
}
] |
2009-10-31
|
[
[
"Baier",
"R.",
"",
"U. Bielefeld"
],
[
"Redlich",
"K.",
"",
"U. Wroclaw"
]
] |
We compute the pressure of a finite density quark-gluon plasma at zero temperature to leading order in hard-thermal-loop perturbation theory, which includes the fermionic excitations and Landau damping. The result is compared with the weak-coupling expansion for finite positive chemical potential $\mu$ through order $\alpha_s^2$ and with a quasiparticle model with a mass depending on $\mu$.
|
hep-ph/0105210
|
Kazutaka Sudoh
|
Kazutaka Sudoh, Han-Wen Huang, and Toshiyuki Morii (Kobe Univ.)
|
Electroproduction of psi' and polarized gluon distribution in a proton
|
9 pages, 6 figures
|
Phys.Lett.B515:99-104,2001
|
10.1016/S0370-2693(01)00843-7
|
KOBE-FHD-01-04
|
hep-ph
| null |
In order to get information about the polarized gluon distribution in a
proton, we studied the electroproduction of \psi' in polarized electron and
polarized proton collisions in the framework of the NRQCD factorization
approach. The value of the cross section d\Delta\sigma / dp_T^2 for color-octet
mechanism is about 5 times larger than that for color-singlet one, and it might
be another test of the color-octet model if the polarized gluon distribution
\Delta g(x) is well known. Furthermore, we found that this reaction is quite
effective for testing the model of gluon polarization by measuring the double
spin asymmetry A_{LL} for the initial electron and proton. Though the shape of
p_T^2 distribution of A_{LL} is quite similar for the production mechanism with
color-octet and color-singlet, we can see a big difference in A_{LL} among
various models of the polarized gluon distribution function \Delta g(x).
|
[
{
"created": "Mon, 21 May 2001 13:24:03 GMT",
"version": "v1"
}
] |
2011-03-23
|
[
[
"Sudoh",
"Kazutaka",
"",
"Kobe Univ."
],
[
"Huang",
"Han-Wen",
"",
"Kobe Univ."
],
[
"Morii",
"Toshiyuki",
"",
"Kobe Univ."
]
] |
In order to get information about the polarized gluon distribution in a proton, we studied the electroproduction of \psi' in polarized electron and polarized proton collisions in the framework of the NRQCD factorization approach. The value of the cross section d\Delta\sigma / dp_T^2 for color-octet mechanism is about 5 times larger than that for color-singlet one, and it might be another test of the color-octet model if the polarized gluon distribution \Delta g(x) is well known. Furthermore, we found that this reaction is quite effective for testing the model of gluon polarization by measuring the double spin asymmetry A_{LL} for the initial electron and proton. Though the shape of p_T^2 distribution of A_{LL} is quite similar for the production mechanism with color-octet and color-singlet, we can see a big difference in A_{LL} among various models of the polarized gluon distribution function \Delta g(x).
|
hep-ph/0504107
|
Ramazan Sever
|
Sameer M. Ikhdair
|
On the B_{c} leptonic decay constant
|
26 pages
| null | null | null |
hep-ph
| null |
We give a review and present a comprehensive calculations for the leptonic
constant B_{c} of the low-lying pseudoscalar and vector states of B_{c}-meson
in the framework of static and QCD-motivated nonrelativistic potential models
taking into account the one-loop and two-loop QCD corrections in the short
distance coefficient that governs the leptonic constant of B_{c} quarkonium
system. Further, we use the scaling relation to predict the leptonic constant
of the nS-states of the $\bar{b%}c$ system. Our results are compared with other
models to gauge the reliability of the predictions and point out differences.
|
[
{
"created": "Thu, 14 Apr 2005 08:16:30 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Ikhdair",
"Sameer M.",
""
]
] |
We give a review and present a comprehensive calculations for the leptonic constant B_{c} of the low-lying pseudoscalar and vector states of B_{c}-meson in the framework of static and QCD-motivated nonrelativistic potential models taking into account the one-loop and two-loop QCD corrections in the short distance coefficient that governs the leptonic constant of B_{c} quarkonium system. Further, we use the scaling relation to predict the leptonic constant of the nS-states of the $\bar{b%}c$ system. Our results are compared with other models to gauge the reliability of the predictions and point out differences.
|
2305.04416
|
Yushan Su
|
Xiangdong Ji, Yizhuang Liu, Yushan Su
|
Threshold resummation for computing large-$x$ parton distribution
through large-momentum effective theory
|
53 pages, 7 figures
| null | null | null |
hep-ph hep-lat hep-th nucl-th
|
http://creativecommons.org/licenses/by/4.0/
|
Parton distribution functions (PDFs) at large $x$ are poorly constrained by
high-energy experimental data, but extremely important for probing physics
beyond standard model at colliders. We study the calculation of PDFs at
large-$x$ through large-momentum $P^z$ expansion of the lattice quasi PDFs.
Similar to deep-inelastic scattering, there are two distinct perturbative
scales in the threshold limit where the matching coefficient can be factorized
into a space-like jet function at scale $P^z|1-y|$ and a pair of heavy-light
Sudakov form factors at scale $P^z$. The matching formula allows us to derive a
full renormalization group resummation of large threshold logarithms, and the
result is consistent with the known calculation to the next-to-next to leading
order (NNLO). This paves the way for direct large-$x$ PDFs calculations in
lattice QCD. As by-products, we find that the space-like jet function is
related to a time-like version calculated previously through analytic
continuation, and the heavy-light Sudakov form factor, calculated here to NNLO,
is a universal object appearing as well in the large momentum expansion of
quasi transverse-momentum-dependent PDFs and quasi wave-function amplitudes.
|
[
{
"created": "Mon, 8 May 2023 01:54:12 GMT",
"version": "v1"
}
] |
2023-05-09
|
[
[
"Ji",
"Xiangdong",
""
],
[
"Liu",
"Yizhuang",
""
],
[
"Su",
"Yushan",
""
]
] |
Parton distribution functions (PDFs) at large $x$ are poorly constrained by high-energy experimental data, but extremely important for probing physics beyond standard model at colliders. We study the calculation of PDFs at large-$x$ through large-momentum $P^z$ expansion of the lattice quasi PDFs. Similar to deep-inelastic scattering, there are two distinct perturbative scales in the threshold limit where the matching coefficient can be factorized into a space-like jet function at scale $P^z|1-y|$ and a pair of heavy-light Sudakov form factors at scale $P^z$. The matching formula allows us to derive a full renormalization group resummation of large threshold logarithms, and the result is consistent with the known calculation to the next-to-next to leading order (NNLO). This paves the way for direct large-$x$ PDFs calculations in lattice QCD. As by-products, we find that the space-like jet function is related to a time-like version calculated previously through analytic continuation, and the heavy-light Sudakov form factor, calculated here to NNLO, is a universal object appearing as well in the large momentum expansion of quasi transverse-momentum-dependent PDFs and quasi wave-function amplitudes.
|
1312.0307
|
Toshitaka Tatsumi
|
T. Tatsumi, K. Nishiyama and S. Karasawa
|
Inhomogeneous chiral phase in the magnetic field
|
8 pages, 3 figures, Proc. of the 2nd International Conference on New
Frontiers in Physics (ICNFP 2013)
| null |
10.1051/epjconf/20147100131
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Inhomogeneous chiral phase is discussed in the presence of the magnetic
field. A topological aspect is pointed out for the complex order parameter, in
relation to the spectral asymmetry of the Dirac operator. It induces an
anomalous baryon number and extremely extends the region of the inhomogeneous
chiral phase in the QCD phase diagram. It is also shown that the novel
tricritical point appears at zero chemical potential, which should be examined
by the lattice QCD simulation.
|
[
{
"created": "Mon, 2 Dec 2013 02:40:58 GMT",
"version": "v1"
}
] |
2015-06-18
|
[
[
"Tatsumi",
"T.",
""
],
[
"Nishiyama",
"K.",
""
],
[
"Karasawa",
"S.",
""
]
] |
Inhomogeneous chiral phase is discussed in the presence of the magnetic field. A topological aspect is pointed out for the complex order parameter, in relation to the spectral asymmetry of the Dirac operator. It induces an anomalous baryon number and extremely extends the region of the inhomogeneous chiral phase in the QCD phase diagram. It is also shown that the novel tricritical point appears at zero chemical potential, which should be examined by the lattice QCD simulation.
|
1201.2949
|
Howard Baer
|
Howard Baer, Vernon Barger, Andre Lessa, Warintorn Sreethawong and
Xerxes Tata
|
Wh plus missing-E_T signature from gaugino pair production at the LHC
|
5 pages with 4 .eps figures
| null |
10.1103/PhysRevD.85.055022
|
UH-511-1186-12
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In SUSY models with heavy squarks and gaugino mass unification, the gaugino
pair production reaction pp-> \tw_1^\pm\tz_2 dominates gluino pair production
for m_{\tg}\agt 1 TeV at LHC with \sqrt{s}=14 TeV (LHC14). For this mass range,
the two-body decays \tw_1\to W\tz_1 and \tz_2\to h\tz_1 are expected to
dominate the chargino and neutralino branching fractions. By searching for \ell
b\bar{b}+MET events from \tw_1^\pm\tz_2 production, we show that LHC14 with 100
fb^{-1} of integrated luminosity becomes sensitive to chargino masses in the
range m_{\tw_1}\sim 450-550 GeV corresponding to m_{\tg}\sim 1.5-2 TeV in
models with gaugino mass unification. For 10^3 fb^{-1}, LHC14 is sensitive to
the Wh channel for m_{\tw_1}\sim 300-800 GeV, corresponding to m_{\tg}\sim
1-2.8 TeV, which is comparable to the reach for gluino pair production followed
by cascade decays. The Wh+MET search channel opens up a new complementary
avenue for SUSY searches at LHC, and serves to point to SUSY as the origin of
any new physics discovered via multijet and multilepton + MET channels.
|
[
{
"created": "Fri, 13 Jan 2012 21:04:22 GMT",
"version": "v1"
}
] |
2013-05-30
|
[
[
"Baer",
"Howard",
""
],
[
"Barger",
"Vernon",
""
],
[
"Lessa",
"Andre",
""
],
[
"Sreethawong",
"Warintorn",
""
],
[
"Tata",
"Xerxes",
""
]
] |
In SUSY models with heavy squarks and gaugino mass unification, the gaugino pair production reaction pp-> \tw_1^\pm\tz_2 dominates gluino pair production for m_{\tg}\agt 1 TeV at LHC with \sqrt{s}=14 TeV (LHC14). For this mass range, the two-body decays \tw_1\to W\tz_1 and \tz_2\to h\tz_1 are expected to dominate the chargino and neutralino branching fractions. By searching for \ell b\bar{b}+MET events from \tw_1^\pm\tz_2 production, we show that LHC14 with 100 fb^{-1} of integrated luminosity becomes sensitive to chargino masses in the range m_{\tw_1}\sim 450-550 GeV corresponding to m_{\tg}\sim 1.5-2 TeV in models with gaugino mass unification. For 10^3 fb^{-1}, LHC14 is sensitive to the Wh channel for m_{\tw_1}\sim 300-800 GeV, corresponding to m_{\tg}\sim 1-2.8 TeV, which is comparable to the reach for gluino pair production followed by cascade decays. The Wh+MET search channel opens up a new complementary avenue for SUSY searches at LHC, and serves to point to SUSY as the origin of any new physics discovered via multijet and multilepton + MET channels.
|
hep-ph/0502126
|
Shmatov Sergei
|
I. Golutvin, A. Sapronov, M. Savina, S. Shmatov
|
ADD extra dimensional gravity and di-muon production at LHC
|
7 pages, 4 figures, Talk given at the XVIIIth International Workshop
"High Energy Physics and Quantum Field Theory", 17-23 June 2004,
St.Petersburg
| null | null | null |
hep-ph
| null |
A possibility to observe TeV-scale gravity signals at the LHC is discussed.
The ADD scenario with large extra dimensions is considered and its LHC
discovery potential is derived studying by muon pairs with large invariant
masses.
|
[
{
"created": "Mon, 14 Feb 2005 14:24:49 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Feb 2005 16:57:39 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Golutvin",
"I.",
""
],
[
"Sapronov",
"A.",
""
],
[
"Savina",
"M.",
""
],
[
"Shmatov",
"S.",
""
]
] |
A possibility to observe TeV-scale gravity signals at the LHC is discussed. The ADD scenario with large extra dimensions is considered and its LHC discovery potential is derived studying by muon pairs with large invariant masses.
|
2312.04953
|
Xuan Luo
|
Xuan Luo, Ruitian Li, Hao Sun
|
Theoretical study of the $B^+\to D^-D_s^{+}\pi^+$ reaction
|
8 pages, 7 figures
| null | null | null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Prompted by the recent discoveries of $T_{c\bar{s}0}(2900)^{++}$ in the
$D_s^+\pi^+$ invariant mass distribution of $B^+\to D^-D_s^+\pi^+$ process, we
present a model that hopes to help us investigate the nature of
$T_{c\bar{s}0}(2900)^{++}$ by reproducing the mass distribution of $D^-\pi^+,
D_s^+\pi^+$ and $D^-D_s^+$ in $B^+ \to D^-D_s^+\pi^+$ decays. The structure of
the triangular singularity peak generated from the $\chi_{c1}D^{*+}K^{*+}$ loop
near the $D^{*+}K^{*+}$ threshold is considered in our model may be the
experimentally discovered resonance-like state structure
$T_{c\bar{s}0}(2900)^{++}$. In addition, we employ a coupled-channel approach
to describe the dominant contribution of the $D\pi$ $S\text{-wave}$ amplitude,
and also consider other excitations. Our model provides a well fit to the
invariant mass distributions of $D^-\pi^+, D_s^+\pi^+$ and $D^-D_s^+$
simultaneously.
|
[
{
"created": "Fri, 8 Dec 2023 10:32:08 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Jan 2024 12:30:31 GMT",
"version": "v2"
}
] |
2024-01-09
|
[
[
"Luo",
"Xuan",
""
],
[
"Li",
"Ruitian",
""
],
[
"Sun",
"Hao",
""
]
] |
Prompted by the recent discoveries of $T_{c\bar{s}0}(2900)^{++}$ in the $D_s^+\pi^+$ invariant mass distribution of $B^+\to D^-D_s^+\pi^+$ process, we present a model that hopes to help us investigate the nature of $T_{c\bar{s}0}(2900)^{++}$ by reproducing the mass distribution of $D^-\pi^+, D_s^+\pi^+$ and $D^-D_s^+$ in $B^+ \to D^-D_s^+\pi^+$ decays. The structure of the triangular singularity peak generated from the $\chi_{c1}D^{*+}K^{*+}$ loop near the $D^{*+}K^{*+}$ threshold is considered in our model may be the experimentally discovered resonance-like state structure $T_{c\bar{s}0}(2900)^{++}$. In addition, we employ a coupled-channel approach to describe the dominant contribution of the $D\pi$ $S\text{-wave}$ amplitude, and also consider other excitations. Our model provides a well fit to the invariant mass distributions of $D^-\pi^+, D_s^+\pi^+$ and $D^-D_s^+$ simultaneously.
|
2302.12262
|
Gonzalo Alonso-\'Alvarez
|
Gonzalo Alonso-\'Alvarez, Joerg Jaeckel, and Diego D. Lopes
|
Tracking axion-like particles at the LHC
|
29 pages, 11 figures. Comments welcome
| null | null | null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Highly boosted axion-like particles decaying into photon pairs are
notoriously hard to detect at the LHC. The collimated decay photons cannot be
individually reconstructed using only electromagnetic calorimeter information,
making the signal less distinguishable from background. In this note we propose
a search strategy to address this issue, exploiting the fact that a fraction of
the decay photons convert into electron-positron pairs inside the tracking
detector. The resulting tracks can be resolved with high resolution, allowing
to separate the two collimated photons and resolve a displaced decay vertex. To
demonstrate the effectiveness of this approach, we apply it to ALPs in the
challenging MeV-GeV range produced via vector boson fusion. We find that such a
search could give sensitivity to untested parameter space.
|
[
{
"created": "Thu, 23 Feb 2023 19:00:00 GMT",
"version": "v1"
}
] |
2023-02-27
|
[
[
"Alonso-Álvarez",
"Gonzalo",
""
],
[
"Jaeckel",
"Joerg",
""
],
[
"Lopes",
"Diego D.",
""
]
] |
Highly boosted axion-like particles decaying into photon pairs are notoriously hard to detect at the LHC. The collimated decay photons cannot be individually reconstructed using only electromagnetic calorimeter information, making the signal less distinguishable from background. In this note we propose a search strategy to address this issue, exploiting the fact that a fraction of the decay photons convert into electron-positron pairs inside the tracking detector. The resulting tracks can be resolved with high resolution, allowing to separate the two collimated photons and resolve a displaced decay vertex. To demonstrate the effectiveness of this approach, we apply it to ALPs in the challenging MeV-GeV range produced via vector boson fusion. We find that such a search could give sensitivity to untested parameter space.
|
gr-qc/0403024
|
G. Bergqvist
|
G. Bergqvist, P. Lankinen
|
Unique characterization of the Bel-Robinson tensor
|
extended version, 13 pages, shorter version published in
Class.Quant.Grav
|
Class.Quant.Grav. 21 (2004) 3499-3504
|
10.1088/0264-9381/21/14/012
| null |
gr-qc
| null |
We prove that a completely symmetric and trace-free rank-4 tensor is, up to
sign, a Bel-Robinson type tensor, i.e., the superenergy tensor of a tensor with
the same algebraic symmetries as the Weyl tensor, if and only if it satisfies a
certain quadratic identity. This may be seen as the first Rainich theory result
for rank-4 tensors.
|
[
{
"created": "Thu, 4 Mar 2004 14:01:38 GMT",
"version": "v1"
},
{
"created": "Sat, 1 May 2004 16:01:09 GMT",
"version": "v2"
},
{
"created": "Tue, 5 Oct 2004 09:43:30 GMT",
"version": "v3"
}
] |
2009-11-10
|
[
[
"Bergqvist",
"G.",
""
],
[
"Lankinen",
"P.",
""
]
] |
We prove that a completely symmetric and trace-free rank-4 tensor is, up to sign, a Bel-Robinson type tensor, i.e., the superenergy tensor of a tensor with the same algebraic symmetries as the Weyl tensor, if and only if it satisfies a certain quadratic identity. This may be seen as the first Rainich theory result for rank-4 tensors.
|
1704.03040
|
Farhad Darabi
|
F. Darabi, K. Atazadeh
|
Einstein static universe, GUP, and natural IR and UV cut-offs
|
10 pages, Minor revision, Title change; To be published in "Int. J.
Geom. Methods Mod. Phys"
|
Int. J. Geometric Methods in Modern Physics 15, 5 (2018) 1850083
|
10.1142/S0219887818500834
| null |
gr-qc hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the Einstein static universe in the framework of Generalized
Uncertainty Principle constructed by the Snyder non-commutative space. It is
shown that the deformation parameter can induce an effective energy density
subject to GUP which obeys the holographic principle (HP) and plays the role of
a cosmological constant. Using the holographic feature of this effective energy
density, we introduce natural IR and UV cut-offs which depend on the GUP based
effective equation of state. Moreover, we propose a solution to the
cosmological constant problem. This solution is based on the result that the
Einstein equations just couple to the tiny holographic based surface energy
density (cosmological constant) induced by the deformation parameter, rather
than the large quantum gravitational based volume energy density (vacuum
energy) having contributions of order $M_P^4$.
|
[
{
"created": "Mon, 10 Apr 2017 20:12:59 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Feb 2018 15:02:04 GMT",
"version": "v2"
}
] |
2019-05-01
|
[
[
"Darabi",
"F.",
""
],
[
"Atazadeh",
"K.",
""
]
] |
We study the Einstein static universe in the framework of Generalized Uncertainty Principle constructed by the Snyder non-commutative space. It is shown that the deformation parameter can induce an effective energy density subject to GUP which obeys the holographic principle (HP) and plays the role of a cosmological constant. Using the holographic feature of this effective energy density, we introduce natural IR and UV cut-offs which depend on the GUP based effective equation of state. Moreover, we propose a solution to the cosmological constant problem. This solution is based on the result that the Einstein equations just couple to the tiny holographic based surface energy density (cosmological constant) induced by the deformation parameter, rather than the large quantum gravitational based volume energy density (vacuum energy) having contributions of order $M_P^4$.
|
hep-ph/9803346
|
Marcus Bleicher
|
M. Bleicher, C. Spieles, C. Ernst, L. Gerland, S. Soff, H. St\"ocker,
W. Greiner, S.A. Bass (Institut f\"ur Theoretische Physik, J. W.
Goethe-Universit\"at, D-60054 Frankfurt am Main, Germany)
|
The Origin of Transverse Flow at the SPS
|
submitted to Phys. Lett. B
|
Phys.Lett. B447 (1999) 227-232
|
10.1016/S0370-2693(98)01599-8
| null |
hep-ph
| null |
We study the transverse expansion in central Pb+Pb collisions at the CERN
SPS. Strong collective motion of hadrons can be created. This flow is mainly
due to meson baryon rescattering. It allows to study the angular distribution
of intermediate mass meson baryon interactions.
|
[
{
"created": "Fri, 13 Mar 1998 17:14:00 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Bleicher",
"M.",
"",
"Institut für Theoretische Physik, J. W.\n Goethe-Universität, D-60054 Frankfurt am Main, Germany"
],
[
"Spieles",
"C.",
"",
"Institut für Theoretische Physik, J. W.\n Goethe-Universität, D-60054 Frankfurt am Main, Germany"
],
[
"Ernst",
"C.",
"",
"Institut für Theoretische Physik, J. W.\n Goethe-Universität, D-60054 Frankfurt am Main, Germany"
],
[
"Gerland",
"L.",
"",
"Institut für Theoretische Physik, J. W.\n Goethe-Universität, D-60054 Frankfurt am Main, Germany"
],
[
"Soff",
"S.",
"",
"Institut für Theoretische Physik, J. W.\n Goethe-Universität, D-60054 Frankfurt am Main, Germany"
],
[
"Stöcker",
"H.",
"",
"Institut für Theoretische Physik, J. W.\n Goethe-Universität, D-60054 Frankfurt am Main, Germany"
],
[
"Greiner",
"W.",
"",
"Institut für Theoretische Physik, J. W.\n Goethe-Universität, D-60054 Frankfurt am Main, Germany"
],
[
"Bass",
"S. A.",
"",
"Institut für Theoretische Physik, J. W.\n Goethe-Universität, D-60054 Frankfurt am Main, Germany"
]
] |
We study the transverse expansion in central Pb+Pb collisions at the CERN SPS. Strong collective motion of hadrons can be created. This flow is mainly due to meson baryon rescattering. It allows to study the angular distribution of intermediate mass meson baryon interactions.
|
2401.07907
|
Shahar Hod
|
Shahar Hod
|
Spatially regular charged black holes supporting charged massive scalar
clouds
|
15 pages
|
Physical Review D 109, 064074 (2024)
| null | null |
gr-qc astro-ph.HE hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
We prove that, as opposed to the familiar charged Reissner-Nordstr\"om
black-hole spacetime, the spatially regular charged Ay\'on-Beato-Garc\'ia (ABG)
black-hole spacetime can support charged scalar clouds, spatially regular
stationary matter configurations which are made of linearized charged massive
scalar fields. Interestingly, we reveal the fact that the composed
black-hole-field system is amenable to an analytical treatment in the regime
$Q/M\ll1\ll M\mu$ of weakly charged black holes and large-mass fields, in which
case it is proved that the dimensionless physical parameter
$\alpha\equiv{{qQ}\over{M\mu}}$ must lie in the narrow interval
$\alpha\in\big(\sqrt{{{3240}\over{6859}}},{{16}\over{23}}\big)$ [here $\{M,Q\}$
are the mass and electric charge of the central black hole and $\{\mu,q\}$ are
the proper mass and charge coupling constant of the supported scalar field]. In
particular, we explicitly prove that, for weakly charged black holes, the
discrete resonance spectrum $\{\alpha(M,Q,\mu,q;n\}^{n=\infty}_{n=0}$ of the
composed charged-ABG-black-hole-charged-massive-scalar-field cloudy
configurations can be determined {\it analytically} in the eikonal large-mass
regime.
|
[
{
"created": "Mon, 15 Jan 2024 19:00:02 GMT",
"version": "v1"
}
] |
2024-04-23
|
[
[
"Hod",
"Shahar",
""
]
] |
We prove that, as opposed to the familiar charged Reissner-Nordstr\"om black-hole spacetime, the spatially regular charged Ay\'on-Beato-Garc\'ia (ABG) black-hole spacetime can support charged scalar clouds, spatially regular stationary matter configurations which are made of linearized charged massive scalar fields. Interestingly, we reveal the fact that the composed black-hole-field system is amenable to an analytical treatment in the regime $Q/M\ll1\ll M\mu$ of weakly charged black holes and large-mass fields, in which case it is proved that the dimensionless physical parameter $\alpha\equiv{{qQ}\over{M\mu}}$ must lie in the narrow interval $\alpha\in\big(\sqrt{{{3240}\over{6859}}},{{16}\over{23}}\big)$ [here $\{M,Q\}$ are the mass and electric charge of the central black hole and $\{\mu,q\}$ are the proper mass and charge coupling constant of the supported scalar field]. In particular, we explicitly prove that, for weakly charged black holes, the discrete resonance spectrum $\{\alpha(M,Q,\mu,q;n\}^{n=\infty}_{n=0}$ of the composed charged-ABG-black-hole-charged-massive-scalar-field cloudy configurations can be determined {\it analytically} in the eikonal large-mass regime.
|
2011.13949
|
Noam Levi
|
Nathaniel Craig, Noam Levi, Alberto Mariotti, Diego Redigolo
|
Ripples in Spacetime from Broken Supersymmetry
|
66 pages latex, fifteen figures incorporated
|
J. High Energ. Phys. 2021, 184 (2021)
|
10.1007/JHEP02(2021)184
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We initiate the study of gravitational wave (GW) signals from first-order
phase transitions in supersymmetry-breaking hidden sectors. Such phase
transitions often occur along a pseudo-flat direction universally related to
supersymmetry (SUSY) breaking in hidden sectors that spontaneously break
$R$-symmetry. The potential along this pseudo-flat direction imbues the phase
transition with a number of novel properties, including a nucleation
temperature well below the scale of heavy states (such that the temperature
dependence is captured by the low-temperature expansion) and significant
friction induced by the same heavy states as they pass through bubble walls. In
low-energy SUSY-breaking hidden sectors, the frequency of the GW signal arising
from such a phase transition is guaranteed to lie within the reach of future
interferometers given existing cosmological constraints on the gravitino
abundance. Once a mediation scheme is specified, the frequency of the GW peak
correlates with the superpartner spectrum. Current bounds on supersymmetry are
compatible with GW signals at future interferometers, while the observation of
a GW signal from a SUSY-breaking hidden sector would imply superpartners within
reach of future colliders.
|
[
{
"created": "Fri, 27 Nov 2020 19:00:04 GMT",
"version": "v1"
}
] |
2021-03-02
|
[
[
"Craig",
"Nathaniel",
""
],
[
"Levi",
"Noam",
""
],
[
"Mariotti",
"Alberto",
""
],
[
"Redigolo",
"Diego",
""
]
] |
We initiate the study of gravitational wave (GW) signals from first-order phase transitions in supersymmetry-breaking hidden sectors. Such phase transitions often occur along a pseudo-flat direction universally related to supersymmetry (SUSY) breaking in hidden sectors that spontaneously break $R$-symmetry. The potential along this pseudo-flat direction imbues the phase transition with a number of novel properties, including a nucleation temperature well below the scale of heavy states (such that the temperature dependence is captured by the low-temperature expansion) and significant friction induced by the same heavy states as they pass through bubble walls. In low-energy SUSY-breaking hidden sectors, the frequency of the GW signal arising from such a phase transition is guaranteed to lie within the reach of future interferometers given existing cosmological constraints on the gravitino abundance. Once a mediation scheme is specified, the frequency of the GW peak correlates with the superpartner spectrum. Current bounds on supersymmetry are compatible with GW signals at future interferometers, while the observation of a GW signal from a SUSY-breaking hidden sector would imply superpartners within reach of future colliders.
|
2301.00041
|
Mattias Ermakov Thing
|
Mads T. Frandsen, Matti Heikinheimo, Mattias E. Thing, Kimmo Tuominen,
Martin Rosenlyst
|
Vector dark matter in supercooled Higgs portal models
|
20 pages, 5 figures
| null |
10.1103/PhysRevD.108.015033
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider extensions of the Standard Model by a hidden sector consisting of
a gauge field coupled with a scalar field. Assuming the absence of dimensionful
parameters in the tree level potential, radiative symmetry breaking will make
the hidden sector gauge field massive and induce the electroweak scale of the
Standard Model. We consider separately dark sector gauge groups $U(1)_{\rm{D}}$
and $SU(2)_{\rm{D}}$, and focus on probing the models with a combination of
direct detection experiments and gravitational wave observatories. We find that
recent dark matter direct detection results significantly constrain the
parameter space of the models where they can account for the observed dark
matter relic density via freeze-out. The gravitational wave signals originating
from strongly first order electroweak phase transition in these models can be
probed in future gravitational wave observatories such as the Laser
Interferometer Space Antenna. We show how the projected results compliment
direct detection experiments and can help probe parameter space near the
neutrino floor of direct detection.
|
[
{
"created": "Fri, 30 Dec 2022 20:15:07 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Aug 2023 12:53:44 GMT",
"version": "v2"
}
] |
2023-08-16
|
[
[
"Frandsen",
"Mads T.",
""
],
[
"Heikinheimo",
"Matti",
""
],
[
"Thing",
"Mattias E.",
""
],
[
"Tuominen",
"Kimmo",
""
],
[
"Rosenlyst",
"Martin",
""
]
] |
We consider extensions of the Standard Model by a hidden sector consisting of a gauge field coupled with a scalar field. Assuming the absence of dimensionful parameters in the tree level potential, radiative symmetry breaking will make the hidden sector gauge field massive and induce the electroweak scale of the Standard Model. We consider separately dark sector gauge groups $U(1)_{\rm{D}}$ and $SU(2)_{\rm{D}}$, and focus on probing the models with a combination of direct detection experiments and gravitational wave observatories. We find that recent dark matter direct detection results significantly constrain the parameter space of the models where they can account for the observed dark matter relic density via freeze-out. The gravitational wave signals originating from strongly first order electroweak phase transition in these models can be probed in future gravitational wave observatories such as the Laser Interferometer Space Antenna. We show how the projected results compliment direct detection experiments and can help probe parameter space near the neutrino floor of direct detection.
|
1309.2097
|
Roshan Foadi
|
Alexander Belyaev, Matthew S. Brown, Roshan Foadi, and Mads T.
Frandsen
|
The Technicolor Higgs in the Light of LHC Data
|
26 pages, 8 figures
| null |
10.1103/PhysRevD.90.035012
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider scenarios in which the 125 GeV resonance observed at the Large
Hadron Collider is a Technicolor (TC) isosinglet scalar, the TC Higgs. By
comparison with quantum chromodynamics, we argue that the couplings of the TC
Higgs to the massive weak bosons are very close to the Standard Model (SM)
values. The couplings to photons and gluons are model-dependent, but close to
the SM values in several TC theories. The couplings of the TC Higgs to SM
fermions are due to interactions beyond TC, such as Extended Technicolor: if
such interactions successfully generate mass for the SM fermions, we argue that
the couplings of the latter to the TC Higgs are also SM-like.
We suggest a generic parameterization of the TC Higgs interactions with SM
particles that accommodates a large class of TC models, and we perform a fit of
these parameters to the Higgs LHC data. The fit reveals regions of parameter
space where the form factors are of order unity and consistent with data at the
95% CL, in agreement with expectations in TC theories. This indicates that the
discovered Higgs boson is consistent with the TC Higgs hypothesis for several
TC theories.
|
[
{
"created": "Mon, 9 Sep 2013 10:23:27 GMT",
"version": "v1"
}
] |
2015-06-17
|
[
[
"Belyaev",
"Alexander",
""
],
[
"Brown",
"Matthew S.",
""
],
[
"Foadi",
"Roshan",
""
],
[
"Frandsen",
"Mads T.",
""
]
] |
We consider scenarios in which the 125 GeV resonance observed at the Large Hadron Collider is a Technicolor (TC) isosinglet scalar, the TC Higgs. By comparison with quantum chromodynamics, we argue that the couplings of the TC Higgs to the massive weak bosons are very close to the Standard Model (SM) values. The couplings to photons and gluons are model-dependent, but close to the SM values in several TC theories. The couplings of the TC Higgs to SM fermions are due to interactions beyond TC, such as Extended Technicolor: if such interactions successfully generate mass for the SM fermions, we argue that the couplings of the latter to the TC Higgs are also SM-like. We suggest a generic parameterization of the TC Higgs interactions with SM particles that accommodates a large class of TC models, and we perform a fit of these parameters to the Higgs LHC data. The fit reveals regions of parameter space where the form factors are of order unity and consistent with data at the 95% CL, in agreement with expectations in TC theories. This indicates that the discovered Higgs boson is consistent with the TC Higgs hypothesis for several TC theories.
|
gr-qc/0011106
|
Marcus Gaul
|
Marcus Gaul and Carlo Rovelli
|
A generalized Hamiltonian Constraint Operator in Loop Quantum Gravity
and its simplest Euclidean Matrix Elements
|
35 pp, 20 eps figures; minor corrections, references added; version
to appear in Class. Quant. Grav
|
Class.Quant.Grav. 18 (2001) 1593-1624
|
10.1088/0264-9381/18/9/301
|
MPI-PhT-2000/39, LMU-TPW-00/22
|
gr-qc hep-th
| null |
We study a generalized version of the Hamiltonian constraint operator in
nonperturbative loop quantum gravity. The generalization is based on admitting
arbitrary irreducible SU(2) representations in the regularization of the
operator, in contrast to the original definition where only the fundamental
representation is taken. This leads to a quantization ambiguity and to a family
of operators with the same classical limit. We calculate the action of the
Euclidean part of the generalized Hamiltonian constraint on trivalent states,
using the graphical notation of Temperley-Lieb recoupling theory. We discuss
the relation between this generalization of the Hamiltonian constraint and
crossing symmetry.
|
[
{
"created": "Wed, 29 Nov 2000 15:36:58 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Mar 2001 17:49:46 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Gaul",
"Marcus",
""
],
[
"Rovelli",
"Carlo",
""
]
] |
We study a generalized version of the Hamiltonian constraint operator in nonperturbative loop quantum gravity. The generalization is based on admitting arbitrary irreducible SU(2) representations in the regularization of the operator, in contrast to the original definition where only the fundamental representation is taken. This leads to a quantization ambiguity and to a family of operators with the same classical limit. We calculate the action of the Euclidean part of the generalized Hamiltonian constraint on trivalent states, using the graphical notation of Temperley-Lieb recoupling theory. We discuss the relation between this generalization of the Hamiltonian constraint and crossing symmetry.
|
2403.02365
|
S Habib Mazharimousavi
|
S. Habib Mazharimousavi
|
Schwarzschild-Levi-Civita black hole
|
Compact Letter, 5 pages no figures
| null | null | null |
gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Inspired by the geometry of the Ernst black hole which interpolates the
static spherically symmetric Schwarzschild black hole and the static axially
symmetric magnetic Melvin spacetime, in this Letter, we aim to present a
solution to Einstein's field equation in vacuum to interpolate the
Schwarzschild black hole and the Levi-Civita spacetime. Hence, we shall call
the solution the Schwarzschild-Levi-Civita black hole. Effectively the solution
is a one-parameter non-asymptotically flat black hole that is static, axially
symmetric, and singular in its axis of symmetry.
|
[
{
"created": "Mon, 4 Mar 2024 09:58:29 GMT",
"version": "v1"
}
] |
2024-03-06
|
[
[
"Mazharimousavi",
"S. Habib",
""
]
] |
Inspired by the geometry of the Ernst black hole which interpolates the static spherically symmetric Schwarzschild black hole and the static axially symmetric magnetic Melvin spacetime, in this Letter, we aim to present a solution to Einstein's field equation in vacuum to interpolate the Schwarzschild black hole and the Levi-Civita spacetime. Hence, we shall call the solution the Schwarzschild-Levi-Civita black hole. Effectively the solution is a one-parameter non-asymptotically flat black hole that is static, axially symmetric, and singular in its axis of symmetry.
|
hep-ph/0410247
|
Teruaki Suyama
|
Teruaki Suyama, Takahiro Tanaka, Bruce Bassett, Hideaki Kudoh
|
Are black holes over-produced during preheating?
|
12 pages, 8 figures, revtex, added references for section 1
|
Phys.Rev. D71 (2005) 063507
|
10.1103/PhysRevD.71.063507
|
KUNS-1939, UTAP-498
|
hep-ph astro-ph gr-qc
| null |
We provide a simple but robust argument that primordial black hole (PBH)
production generically does {\em not} exceed astrophysical bounds during the
resonant preheating phase after inflation. This conclusion is supported by
fully nonlinear lattice simulations of various models in two and three
dimensions which include rescattering but neglect metric perturbations. We
examine the degree to which preheating amplifies density perturbations at the
Hubble scale and show that at the end of the parametric resonance, power
spectra are universal, with no memory of the power spectrum at the end of
inflation. In addition we show how the probability distribution of density
perturbations changes from exponential on very small scales to Gaussian when
smoothed over the Hubble scale -- the crucial length for studies of primordial
black hole formation -- hence justifying the standard assumption of
Gaussianity.
|
[
{
"created": "Mon, 18 Oct 2004 12:08:55 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Oct 2004 01:30:24 GMT",
"version": "v2"
}
] |
2009-11-10
|
[
[
"Suyama",
"Teruaki",
""
],
[
"Tanaka",
"Takahiro",
""
],
[
"Bassett",
"Bruce",
""
],
[
"Kudoh",
"Hideaki",
""
]
] |
We provide a simple but robust argument that primordial black hole (PBH) production generically does {\em not} exceed astrophysical bounds during the resonant preheating phase after inflation. This conclusion is supported by fully nonlinear lattice simulations of various models in two and three dimensions which include rescattering but neglect metric perturbations. We examine the degree to which preheating amplifies density perturbations at the Hubble scale and show that at the end of the parametric resonance, power spectra are universal, with no memory of the power spectrum at the end of inflation. In addition we show how the probability distribution of density perturbations changes from exponential on very small scales to Gaussian when smoothed over the Hubble scale -- the crucial length for studies of primordial black hole formation -- hence justifying the standard assumption of Gaussianity.
|
2402.08057
|
Oscar Braun-White
|
Oscar Braun-White
|
Idealised Antenna Functions for Higher Order QCD Calculations
|
PhD thesis, 260 pages, partially based on arXiv:2204.10755,
arXiv:2302.12787 and arXiv:2307.14999
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this thesis, the infrared structure of squared matrix elements in quantum
chromodynamics (QCD) is scrutinised. Specifically, the triple-collinear
splitting functions are decomposed and improvements to antenna subtraction are
sought through the construction of idealised antenna functions. The
antenna-subtraction technique has demonstrated remarkable effectiveness in
handling next-to-next-to-leading order (NNLO) infrared divergences for a wide
range of QCD processes relevant for colliders. However, since antenna functions
were historically extracted from matrix elements, they did not have uniform
properties, which made the generation of subtraction terms complex. Antenna
subtraction up to NNLO is reviewed, including the role of antenna functions. A
general algorithm is detailed in order to re-build antenna functions, with
idealised features, directly from a specified list of unresolved limits, for
any number of real and virtual emissions. Using this general algorithm,
together with the decomposition of the triple-collinear splitting functions,
all the antenna functions required for NNLO QCD calculations in the final-final
configuration are constructed and it is demonstrated that they form a
consistent NNLO subtraction scheme. The idealised antenna functions should
simplify the generation of subtraction terms and minimise the introduction of
spurious limits. Additionally, the general algorithm sets out an initial
blueprint for next-to-NNLO (N$^3$LO) idealised antennae for use in N$^3$LO QCD
calculations.
|
[
{
"created": "Mon, 12 Feb 2024 20:48:08 GMT",
"version": "v1"
}
] |
2024-02-14
|
[
[
"Braun-White",
"Oscar",
""
]
] |
In this thesis, the infrared structure of squared matrix elements in quantum chromodynamics (QCD) is scrutinised. Specifically, the triple-collinear splitting functions are decomposed and improvements to antenna subtraction are sought through the construction of idealised antenna functions. The antenna-subtraction technique has demonstrated remarkable effectiveness in handling next-to-next-to-leading order (NNLO) infrared divergences for a wide range of QCD processes relevant for colliders. However, since antenna functions were historically extracted from matrix elements, they did not have uniform properties, which made the generation of subtraction terms complex. Antenna subtraction up to NNLO is reviewed, including the role of antenna functions. A general algorithm is detailed in order to re-build antenna functions, with idealised features, directly from a specified list of unresolved limits, for any number of real and virtual emissions. Using this general algorithm, together with the decomposition of the triple-collinear splitting functions, all the antenna functions required for NNLO QCD calculations in the final-final configuration are constructed and it is demonstrated that they form a consistent NNLO subtraction scheme. The idealised antenna functions should simplify the generation of subtraction terms and minimise the introduction of spurious limits. Additionally, the general algorithm sets out an initial blueprint for next-to-NNLO (N$^3$LO) idealised antennae for use in N$^3$LO QCD calculations.
|
1809.07795
|
Gabriele Benomio
|
Gabriele Benomio
|
The Stable Trapping Phenomenon for Black Strings and Black Rings and its
Obstructions on the Decay of Linear Waves
|
60 pages
|
Analysis & PDE 14 (2021) 2427-2496
|
10.2140/apde.2021.14.2427
| null |
gr-qc math-ph math.AP math.MP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The geometry of solutions to the higher dimensional Einstein vacuum equations
presents aspects that are absent in four dimensions, one of the most remarkable
being the existence of stably trapped null geodesics in the exterior of
asymptotically flat black holes. This paper investigates the stable trapping
phenomenon for two families of higher dimensional black holes, namely black
strings and black rings, and how this trapping structure is responsible for the
slow decay of linear waves on their exterior. More precisely, we study decay
properties for the energy of solutions to the scalar, linear wave equation
$\Box_{g_{\textup{ring}}} \Psi=0$, where $g_{\textup{ring}}$ is the metric of a
fixed black ring solution to the five-dimensional Einstein vacuum equations.
For a class $\mathfrak{g}$ of black ring metrics, we prove a logarithmic lower
bound for the uniform energy decay rate on the black ring exterior
$(\mathcal{D},g_{\textup{ring}})$, with $g_{\textup{ring}}\in\mathfrak{g}$. The
proof generalizes the perturbation argument and quasimode construction of
Holzegel--Smulevici \cite{SharpLogHolz} to the case of a non-separable wave
equation and crucially relies on the presence of stably trapped null geodesics
on $\mathcal{D}$. As a by-product, the same logarithmic lower bound can be
established for any five-dimensional black string.
Our result is the first mathematically rigorous statement supporting the
expectation that black rings are dynamically unstable to generic perturbations.
In particular, we conjecture a new \textit{nonlinear} instability for
five-dimensional black strings and thin black rings which is already present at
the level of scalar perturbations and clearly differs from the mechanism driven
by the well-known Gregory--Laflamme instability.
|
[
{
"created": "Thu, 20 Sep 2018 18:36:08 GMT",
"version": "v1"
}
] |
2022-02-09
|
[
[
"Benomio",
"Gabriele",
""
]
] |
The geometry of solutions to the higher dimensional Einstein vacuum equations presents aspects that are absent in four dimensions, one of the most remarkable being the existence of stably trapped null geodesics in the exterior of asymptotically flat black holes. This paper investigates the stable trapping phenomenon for two families of higher dimensional black holes, namely black strings and black rings, and how this trapping structure is responsible for the slow decay of linear waves on their exterior. More precisely, we study decay properties for the energy of solutions to the scalar, linear wave equation $\Box_{g_{\textup{ring}}} \Psi=0$, where $g_{\textup{ring}}$ is the metric of a fixed black ring solution to the five-dimensional Einstein vacuum equations. For a class $\mathfrak{g}$ of black ring metrics, we prove a logarithmic lower bound for the uniform energy decay rate on the black ring exterior $(\mathcal{D},g_{\textup{ring}})$, with $g_{\textup{ring}}\in\mathfrak{g}$. The proof generalizes the perturbation argument and quasimode construction of Holzegel--Smulevici \cite{SharpLogHolz} to the case of a non-separable wave equation and crucially relies on the presence of stably trapped null geodesics on $\mathcal{D}$. As a by-product, the same logarithmic lower bound can be established for any five-dimensional black string. Our result is the first mathematically rigorous statement supporting the expectation that black rings are dynamically unstable to generic perturbations. In particular, we conjecture a new \textit{nonlinear} instability for five-dimensional black strings and thin black rings which is already present at the level of scalar perturbations and clearly differs from the mechanism driven by the well-known Gregory--Laflamme instability.
|
hep-ph/0009075
|
Massimo Pietroni
|
Patrizia Bucci and Massimo Pietroni
|
Boltzmann Suppression of Interacting Heavy Particles
|
7 pages, 5 figures. New section added, with the discussion of the
case of an unstable heavy particle. Version to appear on Phys. Rev. D
|
Phys.Rev. D63 (2001) 045026
|
10.1103/PhysRevD.63.045026
|
DFPD 00/TH/41
|
hep-ph astro-ph hep-th
| null |
Matsumoto and Yoshimura have recently argued that the number density of heavy
particles in a thermal bath is not necessarily Boltzmann-suppressed for T << M,
as power law corrections may emerge at higher orders in perturbation theory.
This fact might have important implications on the determination of WIMP relic
densities. On the other hand, the definition of number densities in a
interacting theory is not a straightforward procedure. It usually requires
renormalization of composite operators and operator mixing, which obscure the
physical interpretation of the computed thermal average. We propose a new
definition for the thermal average of a composite operator, which does not
require any new renormalization counterterm and is thus free from such
ambiguities. Applying this definition to the model of Matsumoto and Yoshimura
we find that it gives number densities which are Boltzmann-suppressed at any
order in perturbation theory. We discuss also heavy particles which are
unstable already at T=0, showing that power law corrections do in general
emerge in this case.
|
[
{
"created": "Wed, 6 Sep 2000 19:28:29 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Nov 2000 10:14:02 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Bucci",
"Patrizia",
""
],
[
"Pietroni",
"Massimo",
""
]
] |
Matsumoto and Yoshimura have recently argued that the number density of heavy particles in a thermal bath is not necessarily Boltzmann-suppressed for T << M, as power law corrections may emerge at higher orders in perturbation theory. This fact might have important implications on the determination of WIMP relic densities. On the other hand, the definition of number densities in a interacting theory is not a straightforward procedure. It usually requires renormalization of composite operators and operator mixing, which obscure the physical interpretation of the computed thermal average. We propose a new definition for the thermal average of a composite operator, which does not require any new renormalization counterterm and is thus free from such ambiguities. Applying this definition to the model of Matsumoto and Yoshimura we find that it gives number densities which are Boltzmann-suppressed at any order in perturbation theory. We discuss also heavy particles which are unstable already at T=0, showing that power law corrections do in general emerge in this case.
|
hep-ph/9702270
|
Michael Sotiropoulos
|
R. Akhoury, M. G. Sotiropoulos and V. I. Zakharov
|
The KLN Theorem and Soft Radiation in Gauge Theories: Abelian Case
|
27 pages, LaTeX, 14 figures
|
Phys. Rev. D 56, 377 (1997)
|
10.1103/PhysRevD.56.377
|
UM-TH-97-04
|
hep-ph
| null |
We present a covariant formulation of the Kinoshita, Lee, Nauenberg (KLN)
theorem for processes involving the radiation of soft particles. The role of
the disconnected diagrams is explored and a rearrangement of the perturbation
theory is performed such that the purely disconnected diagrams are factored
out. The remaining effect of the disconnected diagrams results in a simple
modification of the usual Feynman rules for the S-matrix elements. As an
application, we show that when combined with the Low theorem, this leads to a
proof of the absense of the $1/Q$ corrections to inclusive processes (like the
Drell-Yan process). In this paper the abelian case is discussed to all orders
in the coupling.
|
[
{
"created": "Thu, 6 Feb 1997 00:12:49 GMT",
"version": "v1"
}
] |
2016-08-24
|
[
[
"Akhoury",
"R.",
""
],
[
"Sotiropoulos",
"M. G.",
""
],
[
"Zakharov",
"V. I.",
""
]
] |
We present a covariant formulation of the Kinoshita, Lee, Nauenberg (KLN) theorem for processes involving the radiation of soft particles. The role of the disconnected diagrams is explored and a rearrangement of the perturbation theory is performed such that the purely disconnected diagrams are factored out. The remaining effect of the disconnected diagrams results in a simple modification of the usual Feynman rules for the S-matrix elements. As an application, we show that when combined with the Low theorem, this leads to a proof of the absense of the $1/Q$ corrections to inclusive processes (like the Drell-Yan process). In this paper the abelian case is discussed to all orders in the coupling.
|
hep-ph/9703308
|
Bodo Lampe
|
Bodo Lampe and Andreas Ruffing
|
The First Moment of delta g(x) -- a Comparative Study
|
latex file and 8 figures
| null | null |
MPI-PhT/97-14
|
hep-ph
| null |
The sensititivity of various future polarization experiments to the first
moment Delta g of the polarized gluon density is elucidated in detail. It is
shown to what extent the first moment can be extracted from the future data as
compared to the higher moments. We concentrate on two processes which in the
near future will become an important source of information on the polarized
gluon density, namely the photoproduction of open charm to be studied at CERN
(COMPASS) and SLAC and the production of direct photons at RHIC.
|
[
{
"created": "Wed, 12 Mar 1997 18:31:11 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Lampe",
"Bodo",
""
],
[
"Ruffing",
"Andreas",
""
]
] |
The sensititivity of various future polarization experiments to the first moment Delta g of the polarized gluon density is elucidated in detail. It is shown to what extent the first moment can be extracted from the future data as compared to the higher moments. We concentrate on two processes which in the near future will become an important source of information on the polarized gluon density, namely the photoproduction of open charm to be studied at CERN (COMPASS) and SLAC and the production of direct photons at RHIC.
|
0707.2829
|
Yongli Ping
|
Yongli Ping, Lixin Xu, Hongya Liu
|
Correspondence Between DGP Brane Cosmology and 5D Ricci-flat Cosmology
|
8 pages, 1 figure, accepted by MPLA, added reference
|
Mod.Phys.Lett.A23:695-702,2008
|
10.1142/S0217732308024079
| null |
gr-qc
| null |
We discuss the correspondence between the DGP brane cosmology and 5D
Ricci-flat cosmology by letting their metrics equal each other. By this
correspondence, a specific geometrical property of the arbitrary integral
constant I in DGP metric is given and it is related to the curvature of 5D
bulk. At the same time, the relation of arbitrary functions $\mu$ and $\nu$ in
a class of Ricci-flat solutions is obtained from DGP brane metric.
|
[
{
"created": "Thu, 19 Jul 2007 02:13:58 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Jul 2007 01:34:01 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Ping",
"Yongli",
""
],
[
"Xu",
"Lixin",
""
],
[
"Liu",
"Hongya",
""
]
] |
We discuss the correspondence between the DGP brane cosmology and 5D Ricci-flat cosmology by letting their metrics equal each other. By this correspondence, a specific geometrical property of the arbitrary integral constant I in DGP metric is given and it is related to the curvature of 5D bulk. At the same time, the relation of arbitrary functions $\mu$ and $\nu$ in a class of Ricci-flat solutions is obtained from DGP brane metric.
|
1709.07415
|
Roger-Jos\'e Hern\'andez-Pinto
|
R. J. Hern\'andez-Pinto, M. Epele, D. de Florian, R. Sassot and M.
Stratmann
|
Global extraction of the parton-to-kaon fragmentation functions at NLO
in QCD
|
6 pages, 4 figures, To be published in Journal of Physics Conference
Series (IOP). Proceedings of the XXXI Annual Meeting of the Division of
Particles and Fields of the Mexican Physical Society
| null |
10.1088/1742-6596/912/1/012043
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this document, we present the global QCD analysis of parton-to-kaon
fragmentation functions at next-to-leading order accuracy using the latest
experimental information on single-inclusive kaon production in
electron-positron annihilation, lepton-nucleon deep-inelastic scattering, and
proton-proton collisions. An extended analysis of this work can be found in
Ref.[1].
|
[
{
"created": "Thu, 21 Sep 2017 16:58:54 GMT",
"version": "v1"
}
] |
2017-11-22
|
[
[
"Hernández-Pinto",
"R. J.",
""
],
[
"Epele",
"M.",
""
],
[
"de Florian",
"D.",
""
],
[
"Sassot",
"R.",
""
],
[
"Stratmann",
"M.",
""
]
] |
In this document, we present the global QCD analysis of parton-to-kaon fragmentation functions at next-to-leading order accuracy using the latest experimental information on single-inclusive kaon production in electron-positron annihilation, lepton-nucleon deep-inelastic scattering, and proton-proton collisions. An extended analysis of this work can be found in Ref.[1].
|
2307.02283
|
Thomas Becher
|
Thomas Becher, Nicolas Schalch, Xiaofeng Xu
|
Resummation of Next-to-Leading Non-Global Logarithms at the LHC
|
13 pages, 5 figures; v2: journal version, correction in (9), updated
results with improved treatment of n_f terms
|
Phys.Rev.Lett. 132 (2024) 8, 081602
|
10.1103/PhysRevLett.132.081602
|
MITP-23-033
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In cross sections with angular cuts, an intricate pattern of enhanced
higher-order corrections known as non-global logarithms arises. The leading
logarithmic terms were computed numerically two decades ago, but the
resummation of subleading non-global logarithms remained a challenge that we
solve in this Letter using renormalization group methods in effective field
theory. To achieve next-to-leading logarithmic accuracy, we implement the
two-loop anomalous dimension governing the resummation of non-global logarithms
into a large-$N_c$ parton shower framework, together with one-loop matching
corrections. As a first application, we study the interjet energy flow in
$e^+e^-$ annihilation into two jets. We then present, for the first time,
resummed predictions at next-to-leading logarithmic accuracy for a
gap-between-jets observable at hadron colliders.
|
[
{
"created": "Wed, 5 Jul 2023 13:38:14 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Mar 2024 08:55:27 GMT",
"version": "v2"
}
] |
2024-03-21
|
[
[
"Becher",
"Thomas",
""
],
[
"Schalch",
"Nicolas",
""
],
[
"Xu",
"Xiaofeng",
""
]
] |
In cross sections with angular cuts, an intricate pattern of enhanced higher-order corrections known as non-global logarithms arises. The leading logarithmic terms were computed numerically two decades ago, but the resummation of subleading non-global logarithms remained a challenge that we solve in this Letter using renormalization group methods in effective field theory. To achieve next-to-leading logarithmic accuracy, we implement the two-loop anomalous dimension governing the resummation of non-global logarithms into a large-$N_c$ parton shower framework, together with one-loop matching corrections. As a first application, we study the interjet energy flow in $e^+e^-$ annihilation into two jets. We then present, for the first time, resummed predictions at next-to-leading logarithmic accuracy for a gap-between-jets observable at hadron colliders.
|
1802.05020
|
S. Weinzierl
|
Luise Adams and Stefan Weinzierl
|
The $\varepsilon$-form of the differential equations for Feynman
integrals in the elliptic case
|
15 pages, version to be published
| null |
10.1016/j.physletb.2018.04.002
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Feynman integrals are easily solved if their system of differential equations
is in $\varepsilon$-form. In this letter we show by the explicit example of the
kite integral family that an $\varepsilon$-form can even be achieved, if the
Feynman integrals do not evaluate to multiple polylogarithms. The
$\varepsilon$-form is obtained by a (non-algebraic) change of basis for the
master integrals.
|
[
{
"created": "Wed, 14 Feb 2018 10:16:47 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Apr 2018 20:34:43 GMT",
"version": "v2"
}
] |
2018-04-11
|
[
[
"Adams",
"Luise",
""
],
[
"Weinzierl",
"Stefan",
""
]
] |
Feynman integrals are easily solved if their system of differential equations is in $\varepsilon$-form. In this letter we show by the explicit example of the kite integral family that an $\varepsilon$-form can even be achieved, if the Feynman integrals do not evaluate to multiple polylogarithms. The $\varepsilon$-form is obtained by a (non-algebraic) change of basis for the master integrals.
|
1705.08423
|
Danny Marfatia
|
Alakabha Datta, Jacky Kumar, Jiajun Liao, Danny Marfatia
|
New light mediators for the $R_K$ and $R_{K^*}$ puzzles
|
8 pages, 3 tables. Expanded version
|
Phys. Rev. D 97, 115038 (2018)
|
10.1103/PhysRevD.97.115038
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The measurements of $R_{K}$ and $R_K^{*}$ provide hints for the violation of
lepton universality. However, it is generally difficult to explain the
$R_{K^*}$ measurement in the low $q^2$ range, $0.045 \le q^2 \le 1.1$ GeV$^2$.
Light mediators offer a solution by making the Wilson coefficients $q^2$
dependent. We check if new lepton nonuniversal interactions mediated by a
scalar ($S$) or vector particle ($Z^\prime$) of mass between $10-200$ MeV can
reproduce the data. We find that a 25 MeV $Z^\prime$ with a $q^2$-dependent
$b-s$ coupling and that couples to the electron but not the muon can explain
all three anomalies in conjunction with other measurements. A similar 25 MeV
$S$ provides a good fit to all relevant data except $R_{K^*}$ in the low $q^2$
bin. A 25 MeV $Z^\prime$ with a $q^2$-dependent $b-s$ coupling and that couples
to the muon but not the electron provides a good fit to the combination of the
$R_K$ and $R_{K^*}$ data, but does not fit $R_{K^*}$ in the low $q^2$ bin well.
|
[
{
"created": "Tue, 23 May 2017 17:13:43 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Jun 2017 17:40:09 GMT",
"version": "v2"
},
{
"created": "Mon, 30 Apr 2018 18:48:02 GMT",
"version": "v3"
}
] |
2018-06-22
|
[
[
"Datta",
"Alakabha",
""
],
[
"Kumar",
"Jacky",
""
],
[
"Liao",
"Jiajun",
""
],
[
"Marfatia",
"Danny",
""
]
] |
The measurements of $R_{K}$ and $R_K^{*}$ provide hints for the violation of lepton universality. However, it is generally difficult to explain the $R_{K^*}$ measurement in the low $q^2$ range, $0.045 \le q^2 \le 1.1$ GeV$^2$. Light mediators offer a solution by making the Wilson coefficients $q^2$ dependent. We check if new lepton nonuniversal interactions mediated by a scalar ($S$) or vector particle ($Z^\prime$) of mass between $10-200$ MeV can reproduce the data. We find that a 25 MeV $Z^\prime$ with a $q^2$-dependent $b-s$ coupling and that couples to the electron but not the muon can explain all three anomalies in conjunction with other measurements. A similar 25 MeV $S$ provides a good fit to all relevant data except $R_{K^*}$ in the low $q^2$ bin. A 25 MeV $Z^\prime$ with a $q^2$-dependent $b-s$ coupling and that couples to the muon but not the electron provides a good fit to the combination of the $R_K$ and $R_{K^*}$ data, but does not fit $R_{K^*}$ in the low $q^2$ bin well.
|
hep-ph/0208248
|
Semikoz Dmitry
|
A.Yu. Neronov and D.V. Semikoz
|
Which blazars are neutrino loud?
|
9 pages, 5 figures, version to be published in PRD
|
Phys.Rev. D66 (2002) 123003
|
10.1103/PhysRevD.66.123003
|
MPI-PhT/2002-40
|
hep-ph astro-ph
| null |
Protons accelerated in the cores of active galactic nuclei can effectively
produce neutrinos only if the soft radiation background in the core is
sufficiently high. We find restrictions on the spectral properties and
luminosity of blazars under which they can be strong neutrino sources. We
analyze the possibility that neutrino flux is highly beamed along the rotation
axis of the central black hole. The enhancement of neutrino flux compared to
GeV gamma-ray flux from a given source makes the detection of neutrino point
sources more probable. At the same time the smaller open angle reduces the
number of possible neutrino-loud blazars compared to the number of gamma-ray
loud ones. We present the table of 15 blazars which are the most likely
candidates for the detection by future neutrino telescopes.
|
[
{
"created": "Tue, 27 Aug 2002 15:04:53 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Nov 2002 13:53:07 GMT",
"version": "v2"
}
] |
2009-11-07
|
[
[
"Neronov",
"A. Yu.",
""
],
[
"Semikoz",
"D. V.",
""
]
] |
Protons accelerated in the cores of active galactic nuclei can effectively produce neutrinos only if the soft radiation background in the core is sufficiently high. We find restrictions on the spectral properties and luminosity of blazars under which they can be strong neutrino sources. We analyze the possibility that neutrino flux is highly beamed along the rotation axis of the central black hole. The enhancement of neutrino flux compared to GeV gamma-ray flux from a given source makes the detection of neutrino point sources more probable. At the same time the smaller open angle reduces the number of possible neutrino-loud blazars compared to the number of gamma-ray loud ones. We present the table of 15 blazars which are the most likely candidates for the detection by future neutrino telescopes.
|
hep-ph/9910535
| null |
Michael Joyce, Kimmo Kainulainen, and Tomislav Prokopec
|
Quantum Transport Equations for a Scalar Field
|
16 pages, 2 figures, LaTeX with epsf macro
|
Phys.Lett. B474 (2000) 402-410
|
10.1016/S0370-2693(00)00041-1
|
NORDITA-99/67 HE, NBI-HE-99-42, UNIL-IPT/99-3, LPT Orsay 99-86
|
hep-ph hep-th nucl-th quant-ph
| null |
We derive quantum Boltzmann equations from Schwinger-Dyson equations in
gradient expansion for a weakly coupled scalar field theory with a spatially
varying mass. We find that at higher order in gradients a full description of
the system requires specifying not only an on shell distribution function but
also a finite number of its derivatives, or equivalently its higher moments.
These derivatives describe quantum coherence arising as a consequence of
localization in position space. We then show that in the limit of frequent
scatterings coherent quantum effects are suppressed, and the transport
equations reduce to the single Boltzmann equation for particle density, in
which particles flow along modified semiclassical trajectories in phase space.
|
[
{
"created": "Thu, 28 Oct 1999 17:43:56 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Joyce",
"Michael",
""
],
[
"Kainulainen",
"Kimmo",
""
],
[
"Prokopec",
"Tomislav",
""
]
] |
We derive quantum Boltzmann equations from Schwinger-Dyson equations in gradient expansion for a weakly coupled scalar field theory with a spatially varying mass. We find that at higher order in gradients a full description of the system requires specifying not only an on shell distribution function but also a finite number of its derivatives, or equivalently its higher moments. These derivatives describe quantum coherence arising as a consequence of localization in position space. We then show that in the limit of frequent scatterings coherent quantum effects are suppressed, and the transport equations reduce to the single Boltzmann equation for particle density, in which particles flow along modified semiclassical trajectories in phase space.
|
2009.07059
|
Gregory Patellis
|
George Manolakos, Gregory Patellis and George Zoupanos
|
$N=1$ trinification from dimensional reduction of $N=1$, $10D$ $E_8$
over $SU(3)/U(1)\times U(1)\times Z_3$ and its phenomenological consequences
|
14 pages, to be published in Physics Letters B
| null |
10.1016/j.physletb.2020.136031
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present an extension of the Standard Model that results from the
dimensional reduction of the $\mathcal{N}=1$, $10D$ $E_8$ group over a $M_4
\times B_0/ \mathbf{Z}_3 $ space, where $B_0$ is the nearly-K\"ahler manifold
$SU(3)/U(1) \times U(1)$ and $\mathbf{Z}_3$ is a freely acting discrete group
on $B_0$. Using the Wilson flux breaking mechanism we are left in four
dimensions with an $\mathcal{N}=1$ $SU(3)^3$ gauge theory. Below the
unification scale we have a two Higgs doublet model in a split-like
supersymmetric version of the Standard Model, which yields third generation
quark and light Higgs masses within the experimental limits and predicts the
LSP $\sim $ 1500 $GeV$.
|
[
{
"created": "Tue, 15 Sep 2020 13:11:46 GMT",
"version": "v1"
},
{
"created": "Sun, 13 Dec 2020 15:48:52 GMT",
"version": "v2"
}
] |
2020-12-23
|
[
[
"Manolakos",
"George",
""
],
[
"Patellis",
"Gregory",
""
],
[
"Zoupanos",
"George",
""
]
] |
We present an extension of the Standard Model that results from the dimensional reduction of the $\mathcal{N}=1$, $10D$ $E_8$ group over a $M_4 \times B_0/ \mathbf{Z}_3 $ space, where $B_0$ is the nearly-K\"ahler manifold $SU(3)/U(1) \times U(1)$ and $\mathbf{Z}_3$ is a freely acting discrete group on $B_0$. Using the Wilson flux breaking mechanism we are left in four dimensions with an $\mathcal{N}=1$ $SU(3)^3$ gauge theory. Below the unification scale we have a two Higgs doublet model in a split-like supersymmetric version of the Standard Model, which yields third generation quark and light Higgs masses within the experimental limits and predicts the LSP $\sim $ 1500 $GeV$.
|
1303.3227
|
Umberto D'Alesio
|
M. Anselmino (1), M. Boglione (1), U. D'Alesio (2,3), E. Leader (4),
S. Melis (5), F. Murgia (3), A. Prokudin (6) ((1) University of Torino and
INFN, Torino, Italy, (2) University of Cagliari, Italy, (3) INFN, Cagliari,
Italy, (4) Imperial College, London, UK, (5) ECT, Trento, Italy, (6) JLab,
Newport News, USA)
|
On the potential role of the Collins effect in A_N in pp --> pion X
|
4 pages, 4 figures, uses cimento.cls. Talk delivered by U. D'Alesio
at the "3rd Workshop on the QCD Structure of the Nucleon" (QCD-N'12), Oct.
22-26, 2012, Bilbao, Spain. Submitted to "Il Nuovo Cimento C"
| null |
10.1393/ncc/i2013-11578-2
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Transverse single spin asymmetries in pp --> pion X processes, while on a
quite firm ground experimentally, are still a much debated phenomenological
issue. We consider them in a transverse momentum dependent factorization
scheme. After revisiting a previous result, we give new estimates of the
Collins contribution by adopting the latest information on the Collins and
transversity functions, as extracted from SIDIS and e+e- data.
|
[
{
"created": "Wed, 13 Mar 2013 17:46:53 GMT",
"version": "v1"
}
] |
2022-03-02
|
[
[
"Anselmino",
"M.",
""
],
[
"Boglione",
"M.",
""
],
[
"D'Alesio",
"U.",
""
],
[
"Leader",
"E.",
""
],
[
"Melis",
"S.",
""
],
[
"Murgia",
"F.",
""
],
[
"Prokudin",
"A.",
""
]
] |
Transverse single spin asymmetries in pp --> pion X processes, while on a quite firm ground experimentally, are still a much debated phenomenological issue. We consider them in a transverse momentum dependent factorization scheme. After revisiting a previous result, we give new estimates of the Collins contribution by adopting the latest information on the Collins and transversity functions, as extracted from SIDIS and e+e- data.
|
0910.2123
|
Anna-Zuzana Dubnickova
|
E. Bartos, S. Dubnicka, A.-Z. Dubnickova, M. Fujikawa, H. Hayashii
|
Parameter differences of the charged and neutral rho-meson family
| null |
Nucl.Phys.Proc.Suppl.198:186-189,2010
|
10.1016/j.nuclphysbps.2009.12.036
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
New very precise KLOE data on $\m{e}^+\m{e}^-\to\pi^+\pi^-$ obtained by
radiative return method in Frascati are unified with corrected CMD-2 and SND
Novosibirsk $\m{e}^+\m{e}^-\to\pi^+\pi^-$ data and supplemented below and
beyond by older data in order to be described by the unitary and analytic pion
electromagnetic form factor model, which provides the most precise neutral
$\rho$-meson family parameters.
Then the recently appeared accurate Belle (KEK) data of the weak pion form
factor are described by the same unitary and analytic model, as it follows from
the CVC hypothesis, providing the charged $\rho$-meson family parameters. As a
result the most reliable parameter differences of the $\rho$-meson family are
determined.
|
[
{
"created": "Mon, 12 Oct 2009 10:08:18 GMT",
"version": "v1"
}
] |
2010-04-22
|
[
[
"Bartos",
"E.",
""
],
[
"Dubnicka",
"S.",
""
],
[
"Dubnickova",
"A. -Z.",
""
],
[
"Fujikawa",
"M.",
""
],
[
"Hayashii",
"H.",
""
]
] |
New very precise KLOE data on $\m{e}^+\m{e}^-\to\pi^+\pi^-$ obtained by radiative return method in Frascati are unified with corrected CMD-2 and SND Novosibirsk $\m{e}^+\m{e}^-\to\pi^+\pi^-$ data and supplemented below and beyond by older data in order to be described by the unitary and analytic pion electromagnetic form factor model, which provides the most precise neutral $\rho$-meson family parameters. Then the recently appeared accurate Belle (KEK) data of the weak pion form factor are described by the same unitary and analytic model, as it follows from the CVC hypothesis, providing the charged $\rho$-meson family parameters. As a result the most reliable parameter differences of the $\rho$-meson family are determined.
|
hep-ph/0303260
|
Gizo Nanava
|
G.Nanava and Z.Was
|
How to use SANC to improve the PHOTOS Monte Carlo simulation of
bremsstrahlung in leptonic W-Boson decays
|
Submitted to Acta Physica Polonica. 8 pages, 5 figures
|
Acta Phys.Polon. B34 (2003) 4561-4570
| null |
CERN-TH/2003-075
|
hep-ph
| null |
Using the SANC system we study the one-loop electroweak standard model
predictions, including virtual and real photon emission, for the decays of the
on-shell vector boson, W --> L ANTI-NU (GAMMA). The complete one-loop
corrections and exact photon emission matrix element are taken into account.
For the phase-space integration, the Monte Carlo technique is used. This
provides a useful element, first for the evaluation of the theoretical
uncertainty of PHOTOS. Later we analyse the source of the differences between
SANC and PHOTOS and we calculate the additional weight, which once installed,
improves predictions of PHOTOS simulations. We can conclude that, after the
correction of the weight is implemented, the theoretical uncertainty of PHOTOS
simulations due to an incomplete first-order matrix element is reduced to below
alpha/pi, for observables not tagging the photon in a direct way, and to 10%
otherwise. This is interesting for applications in the phenomenology of the
ongoing LEP2 and future LC and LHC experimental studies.
|
[
{
"created": "Mon, 31 Mar 2003 13:52:37 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Apr 2003 08:51:08 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Nanava",
"G.",
""
],
[
"Was",
"Z.",
""
]
] |
Using the SANC system we study the one-loop electroweak standard model predictions, including virtual and real photon emission, for the decays of the on-shell vector boson, W --> L ANTI-NU (GAMMA). The complete one-loop corrections and exact photon emission matrix element are taken into account. For the phase-space integration, the Monte Carlo technique is used. This provides a useful element, first for the evaluation of the theoretical uncertainty of PHOTOS. Later we analyse the source of the differences between SANC and PHOTOS and we calculate the additional weight, which once installed, improves predictions of PHOTOS simulations. We can conclude that, after the correction of the weight is implemented, the theoretical uncertainty of PHOTOS simulations due to an incomplete first-order matrix element is reduced to below alpha/pi, for observables not tagging the photon in a direct way, and to 10% otherwise. This is interesting for applications in the phenomenology of the ongoing LEP2 and future LC and LHC experimental studies.
|
hep-ph/9711218
|
Paul Frampton
|
Paul H. Frampton and Pham Quang Hung
|
Long-Lived Quarks?
|
10 pages, Latex
|
Phys.Rev. D58 (1998) 057704
|
10.1103/PhysRevD.58.057704
|
IFP-745-UNC
|
hep-ph
| null |
Several lines of reasoning suggest that there might exist a non-sequential
fourth generation of heavy quarks having very small mixing with light quarks
and hence exceptionally long lifetime.
|
[
{
"created": "Tue, 4 Nov 1997 01:14:00 GMT",
"version": "v1"
}
] |
2009-10-30
|
[
[
"Frampton",
"Paul H.",
""
],
[
"Hung",
"Pham Quang",
""
]
] |
Several lines of reasoning suggest that there might exist a non-sequential fourth generation of heavy quarks having very small mixing with light quarks and hence exceptionally long lifetime.
|
1810.02220
|
Ingolf Bischer
|
Ingolf Bischer, Werner Rodejohann
|
General Neutrino Interactions at the DUNE Near Detector
|
15+6 pages, 4 figures, 3 tables
|
Phys. Rev. D 99, 036006 (2019)
|
10.1103/PhysRevD.99.036006
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider the effect of general neutrino interactions (scalar, vector,
pseudoscalar, axial vector and tensor) in neutrino-electron scattering at the
DUNE near detector. Those interactions can be associated with heavy new physics
and their effect is to cause distortions in the recoil spectrum of the
electrons. We show that for some cases energy scales up to 9 TeV are accessible
after a 5 year run and that current bounds on interaction parameters can be
improved by up to an order of magnitude. The full set of general interactions
includes the usually considered neutrino-electron non-standard matter
interactions, and the near detector will give limits comparable but
complementary to the ones from the analysis of neutrino oscillations in the far
detector.
|
[
{
"created": "Thu, 4 Oct 2018 13:52:46 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Feb 2019 12:41:09 GMT",
"version": "v2"
}
] |
2019-02-13
|
[
[
"Bischer",
"Ingolf",
""
],
[
"Rodejohann",
"Werner",
""
]
] |
We consider the effect of general neutrino interactions (scalar, vector, pseudoscalar, axial vector and tensor) in neutrino-electron scattering at the DUNE near detector. Those interactions can be associated with heavy new physics and their effect is to cause distortions in the recoil spectrum of the electrons. We show that for some cases energy scales up to 9 TeV are accessible after a 5 year run and that current bounds on interaction parameters can be improved by up to an order of magnitude. The full set of general interactions includes the usually considered neutrino-electron non-standard matter interactions, and the near detector will give limits comparable but complementary to the ones from the analysis of neutrino oscillations in the far detector.
|
1606.00554
|
Kalpana Bora
|
Kalpana Bora, Gayatri Ghosh, Debajyoti Dutta
|
Octant Degeneracy, Quadrant of leptonic CPV phase at Long Baseline
Neutrino Experiments and Baryogenesis
|
14 pages, 5 figures, 2 Tables, New Analysis
|
Adv in High Energy Physics, Vol 2016(2016), ID 9496758, 11 pages
|
10.1155/2016/9496758
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In a recent work by us, we have studied, how CP violation discovery potential
can be improved at long baseline neutrino experiments (LBNE/DUNE), by combining
with its ND (near detector) and reactor experiments. In this work, we discuss
how this study can be further analysed to resolve entanglement of the quadrant
of leptonic CPV phase and Octant of atmospheric mixing angle $ \theta_{23} $,
at LBNEs. The study is done for both NH (Normal hierarchy) and IH (Inverted
hierarchy), HO (Higher Octant) and LO (Lower Octant). We show how baryogenesis
can enhance the effect of resolving this entanglement, and how possible values
of the leptonic CP-violating phase $ \delta_{CP} $ can be predicted in this
context. With respect to the latest global fit data of neutrino mixing angles,
we predict the values of $ \delta_{CP} $ for different cases. In this context
we present favoured values of $ \delta_{CP} $ ($ \delta_{CP} $ range at $ \geq
$ 2$ \sigma $ ) constrained by the latest updated BAU range and also confront
our predictions of $ \delta_{CP} $ with an up-to-date global analysis of
neutrino oscillation data. We find that some region of the favoured $
\delta_{CP} $ parameter space lies within the best fit values around $
\delta_{CP} \simeq 1.3\pi-1.4 \pi $. A detailed analytic and numerical study of
baryogenesis through leptogenesis is performed in this framework in a model
independent way.
|
[
{
"created": "Thu, 2 Jun 2016 06:47:20 GMT",
"version": "v1"
}
] |
2016-10-04
|
[
[
"Bora",
"Kalpana",
""
],
[
"Ghosh",
"Gayatri",
""
],
[
"Dutta",
"Debajyoti",
""
]
] |
In a recent work by us, we have studied, how CP violation discovery potential can be improved at long baseline neutrino experiments (LBNE/DUNE), by combining with its ND (near detector) and reactor experiments. In this work, we discuss how this study can be further analysed to resolve entanglement of the quadrant of leptonic CPV phase and Octant of atmospheric mixing angle $ \theta_{23} $, at LBNEs. The study is done for both NH (Normal hierarchy) and IH (Inverted hierarchy), HO (Higher Octant) and LO (Lower Octant). We show how baryogenesis can enhance the effect of resolving this entanglement, and how possible values of the leptonic CP-violating phase $ \delta_{CP} $ can be predicted in this context. With respect to the latest global fit data of neutrino mixing angles, we predict the values of $ \delta_{CP} $ for different cases. In this context we present favoured values of $ \delta_{CP} $ ($ \delta_{CP} $ range at $ \geq $ 2$ \sigma $ ) constrained by the latest updated BAU range and also confront our predictions of $ \delta_{CP} $ with an up-to-date global analysis of neutrino oscillation data. We find that some region of the favoured $ \delta_{CP} $ parameter space lies within the best fit values around $ \delta_{CP} \simeq 1.3\pi-1.4 \pi $. A detailed analytic and numerical study of baryogenesis through leptogenesis is performed in this framework in a model independent way.
|
hep-ph/9504311
|
W. S. Hou
|
Wei-Shu Hou and Gwo-Guang Wong
|
$\mu^+e^- <---> \mu^- e^+$ Transitions via Neutral Scalar Bosons
|
12 pages, ReVtex, 3 figures available upon request
|
Phys.Rev. D53 (1996) 1537-1541
|
10.1103/PhysRevD.53.1537
|
NTUTH-95-03
|
hep-ph
| null |
With $\mu\to e\gamma$ decay forbidden by multiplicative lepton number
conservation, we study muonium--antimuonium transitions induced by neutral
scalar bosons. Pseudoscalars do not induce conversion for triplet muonium,
while for singlet muonium, pseudoscalar and scalar contributions add
constructively. This is in contrast to the usual case of doubly charged scalar
exchange, where the conversion rate is the same for both singlet and triplet
muonium. Complementary to muonium conversion studies, high energy $\mu^+e^- \to
\mu^- e^+$ and $e^-e^- \to \mu^- \mu^-$ collisions could reveal spectacular
resonance peaks for the cases of neutral and doubly charged scalars,
respectively.
|
[
{
"created": "Mon, 17 Apr 1995 20:07:49 GMT",
"version": "v1"
}
] |
2016-09-01
|
[
[
"Hou",
"Wei-Shu",
""
],
[
"Wong",
"Gwo-Guang",
""
]
] |
With $\mu\to e\gamma$ decay forbidden by multiplicative lepton number conservation, we study muonium--antimuonium transitions induced by neutral scalar bosons. Pseudoscalars do not induce conversion for triplet muonium, while for singlet muonium, pseudoscalar and scalar contributions add constructively. This is in contrast to the usual case of doubly charged scalar exchange, where the conversion rate is the same for both singlet and triplet muonium. Complementary to muonium conversion studies, high energy $\mu^+e^- \to \mu^- e^+$ and $e^-e^- \to \mu^- \mu^-$ collisions could reveal spectacular resonance peaks for the cases of neutral and doubly charged scalars, respectively.
|
1705.07525
|
Ahmad Borzou
|
Ahmad Borzou, Gerald Cleaver, and Behrouz Mirza
|
Lorentz Gauge Theory of Gravity in Electron Positron Colliders
|
12 pages, 3 figures, accepted for publication in CQG
|
Classical and Quantum Gravity, 34 (2017) 225013
|
10.1088/1361-6382/aa8f7c
| null |
gr-qc hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Lorentz gauge theory (LGT) is a feasible candidate for theory of quantum
gravity in which routine field theory calculations can be carried out
perturbatively without encountering too many divergences. In LGT spin of matter
also gravitates. The spin-generated gravity is expected to be extremely
stronger than that generated by mass and could be explored in current
colliders. In this article the observable signals of the theory in an
electron-positron collider is investigated. We specifically study pair
annihilation into two gravitons, and LGT corrections to processes like
$e^-+e^+\rightarrow \mu^-+\mu^+$ and $e^-+e^+\rightarrow e^-+e^+$.
|
[
{
"created": "Mon, 22 May 2017 00:16:54 GMT",
"version": "v1"
},
{
"created": "Sat, 30 Sep 2017 02:16:25 GMT",
"version": "v2"
}
] |
2017-11-03
|
[
[
"Borzou",
"Ahmad",
""
],
[
"Cleaver",
"Gerald",
""
],
[
"Mirza",
"Behrouz",
""
]
] |
Lorentz gauge theory (LGT) is a feasible candidate for theory of quantum gravity in which routine field theory calculations can be carried out perturbatively without encountering too many divergences. In LGT spin of matter also gravitates. The spin-generated gravity is expected to be extremely stronger than that generated by mass and could be explored in current colliders. In this article the observable signals of the theory in an electron-positron collider is investigated. We specifically study pair annihilation into two gravitons, and LGT corrections to processes like $e^-+e^+\rightarrow \mu^-+\mu^+$ and $e^-+e^+\rightarrow e^-+e^+$.
|
hep-ph/0507039
|
Sven-Olaf Moch
|
S. Moch, J.A.M. Vermaseren and A. Vogt
|
The Quark Form Factor at Higher Orders
|
16 pages, 1 figure, Latex
|
JHEP 0508 (2005) 049
|
10.1088/1126-6708/2005/08/049
|
DESY 05-106, SFB/CPP-05-26, DCPT/05/66, IPPP/05/33, NIKHEF 05-011
|
hep-ph hep-th
| null |
We study the electromagnetic on-shell form factor of quarks in massless
perturbative QCD. We derive the complete pole part in dimensional
regularization at three loops, and extend the resummation of the form factor to
the next-to-next-to-leading contributions. These results are employed to
evaluate the infrared finite absolute ratio of the time-like and space-like
form factors up to the fourth order in the strong coupling constant. Besides
for the pole structure of higher-loop QCD amplitudes, our new contributions to
the form factor are also relevant for the high-energy limit of massive gauge
theories like QED. The highest-transcendentality component of our results
confirms a result recently obtained in N=4 Super-Yang-Mills theory.
|
[
{
"created": "Mon, 4 Jul 2005 13:14:58 GMT",
"version": "v1"
}
] |
2009-11-11
|
[
[
"Moch",
"S.",
""
],
[
"Vermaseren",
"J. A. M.",
""
],
[
"Vogt",
"A.",
""
]
] |
We study the electromagnetic on-shell form factor of quarks in massless perturbative QCD. We derive the complete pole part in dimensional regularization at three loops, and extend the resummation of the form factor to the next-to-next-to-leading contributions. These results are employed to evaluate the infrared finite absolute ratio of the time-like and space-like form factors up to the fourth order in the strong coupling constant. Besides for the pole structure of higher-loop QCD amplitudes, our new contributions to the form factor are also relevant for the high-energy limit of massive gauge theories like QED. The highest-transcendentality component of our results confirms a result recently obtained in N=4 Super-Yang-Mills theory.
|
1810.11035
|
Sebastian Dumitru
|
Sebastian Dumitru, Burt A. Ovrut and Austin Purves
|
The $R$-parity Violating Decays of Charginos and Neutralinos in the B-L
MSSM
|
62 pages, 12 figures, added references in section 1, corrected some
calculation errors
|
JHEP 1902 (2019) 124
|
10.1007/JHEP02(2019)124
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The $B-L$ MSSM is the MSSM with three right-handed neutrino chiral multiplets
and gauged $B-L$ symmetry. The $B-L$ symmetry is broken by the third family
right-handed sneutrino acquiring a VEV, thus spontaneously breaking $R$-parity.
Within a natural range of soft supersymmetry breaking parameters, it is shown
that a large and uncorrelated number of initial values satisfy all present
phenomenological constraints; including the correct masses for the $W^{\pm}$,
$Z^0$ bosons, having all sparticles exceeding their present lower bounds and
giving the experimentally measured value for the Higgs boson. For this "valid"
set of initial values, there are a number of different LSPs, each occurring a
calculable number of times. We plot this statistically and determine that among
the most prevalent LSPs are chargino and neutralino mass eigenstates. In this
paper, the $R$-parity violating decay channels of charginos and neutralinos to
standard model particles are determined, and the interaction vertices and decay
rates computed analytically. These results are valid for any chargino and
neutralino, regardless of whether or not they are the LSP. For chargino and
neutralino LSPs, we will-- in a subsequent series of papers --present a
numerical study of their RPV decays evaluated statistically over the range of
associated valid initial points.
|
[
{
"created": "Thu, 25 Oct 2018 18:00:57 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Mar 2019 19:01:50 GMT",
"version": "v2"
},
{
"created": "Sun, 2 Jun 2019 02:16:39 GMT",
"version": "v3"
}
] |
2019-06-04
|
[
[
"Dumitru",
"Sebastian",
""
],
[
"Ovrut",
"Burt A.",
""
],
[
"Purves",
"Austin",
""
]
] |
The $B-L$ MSSM is the MSSM with three right-handed neutrino chiral multiplets and gauged $B-L$ symmetry. The $B-L$ symmetry is broken by the third family right-handed sneutrino acquiring a VEV, thus spontaneously breaking $R$-parity. Within a natural range of soft supersymmetry breaking parameters, it is shown that a large and uncorrelated number of initial values satisfy all present phenomenological constraints; including the correct masses for the $W^{\pm}$, $Z^0$ bosons, having all sparticles exceeding their present lower bounds and giving the experimentally measured value for the Higgs boson. For this "valid" set of initial values, there are a number of different LSPs, each occurring a calculable number of times. We plot this statistically and determine that among the most prevalent LSPs are chargino and neutralino mass eigenstates. In this paper, the $R$-parity violating decay channels of charginos and neutralinos to standard model particles are determined, and the interaction vertices and decay rates computed analytically. These results are valid for any chargino and neutralino, regardless of whether or not they are the LSP. For chargino and neutralino LSPs, we will-- in a subsequent series of papers --present a numerical study of their RPV decays evaluated statistically over the range of associated valid initial points.
|
2210.00007
|
Oscar Castillo Felisola Dr.
|
Oscar Castillo-Felisola and Dominic T. Price and Mattia Scomparin
|
Cadabra and Python algorithms in General Relativity and Cosmology II:
Gravitational Waves
|
32 pages, 3 figures, cadabra code blocks. For associated files, see
https://gitlab.com/cdbgr/cadabra-gravity-II
| null |
10.1016/j.cpc.2023.108748
| null |
gr-qc cs.MS physics.class-ph physics.comp-ph
|
http://creativecommons.org/licenses/by/4.0/
|
Computer Algebra Systems (CASs) like Cadabra Software play a prominent role
in a wide range of research activities in physics and related fields. We show
how Cadabra language is easily implemented in the well established Python
programming framework, gaining excellent flexibility and customization to
address the issue of tensor perturbations in General Relativity. We obtain a
performing algorithm to decompose tensorial quantities up to any perturbative
order of the metric. The features of our code are tested by discussing some
concrete computational issues in research activities related to
first/higher-order gravitational waves.
|
[
{
"created": "Fri, 30 Sep 2022 16:58:21 GMT",
"version": "v1"
}
] |
2023-05-17
|
[
[
"Castillo-Felisola",
"Oscar",
""
],
[
"Price",
"Dominic T.",
""
],
[
"Scomparin",
"Mattia",
""
]
] |
Computer Algebra Systems (CASs) like Cadabra Software play a prominent role in a wide range of research activities in physics and related fields. We show how Cadabra language is easily implemented in the well established Python programming framework, gaining excellent flexibility and customization to address the issue of tensor perturbations in General Relativity. We obtain a performing algorithm to decompose tensorial quantities up to any perturbative order of the metric. The features of our code are tested by discussing some concrete computational issues in research activities related to first/higher-order gravitational waves.
|
1505.06963
|
Mohammed M. Khalil
|
Ahmed Farag Ali, Mir Faizal, Mohammed M. Khalil
|
Short Distance Physics of the Inflationary de Sitter Universe
|
18 pages, 9 figures. Accepted in JCAP
|
JCAP 09(2015)025
|
10.1088/1475-7516/2015/09/025
| null |
gr-qc astro-ph.CO hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this work, we investigate inflationary cosmology using scalar field theory
deformed by the generalized uncertainty principle (GUP) containing a linear
momentum term. Apart from being consistent with the existence of a minimum
measurable length scale, this GUP is also consistent with doubly special
relativity and hence with the existence of maximum measurable momentum. We use
this deformed scalar field theory to analyze the tensor and scalar mode
equations in a de Sitter background, and to calculate modifications to the
tensor-to-scalar ratio. Finally, we compare our results for the
tensor-to-scalar ratio with the Planck data to constrain the minimum length
parameter in the GUP.
|
[
{
"created": "Thu, 21 May 2015 23:16:51 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Aug 2015 22:51:09 GMT",
"version": "v2"
}
] |
2015-12-02
|
[
[
"Ali",
"Ahmed Farag",
""
],
[
"Faizal",
"Mir",
""
],
[
"Khalil",
"Mohammed M.",
""
]
] |
In this work, we investigate inflationary cosmology using scalar field theory deformed by the generalized uncertainty principle (GUP) containing a linear momentum term. Apart from being consistent with the existence of a minimum measurable length scale, this GUP is also consistent with doubly special relativity and hence with the existence of maximum measurable momentum. We use this deformed scalar field theory to analyze the tensor and scalar mode equations in a de Sitter background, and to calculate modifications to the tensor-to-scalar ratio. Finally, we compare our results for the tensor-to-scalar ratio with the Planck data to constrain the minimum length parameter in the GUP.
|
hep-ph/0401083
|
Franco Buccella
|
F. Buccella and P. Sorba
|
Narrow width pentaquarks
|
11 pages
|
Mod.Phys.Lett. A19 (2004) 1547
|
10.1142/S0217732304014835
|
DSF-43/2003
|
hep-ph
| null |
A general study of pentaquarks built with four quarks in a L=1 state and an
antiquark in S-wave shows that several of such states are forbidden by a
selection rule, which holds in the limit of flavour symmetry, to decay into a
baryon and a meson final state. We identify the most promising \bar{10}
multiplet for the classification of the Theta^+ and Xi^{--} particles recently
discovered with the prediction of a narrow width for both of them.
|
[
{
"created": "Mon, 12 Jan 2004 14:32:19 GMT",
"version": "v1"
}
] |
2009-11-10
|
[
[
"Buccella",
"F.",
""
],
[
"Sorba",
"P.",
""
]
] |
A general study of pentaquarks built with four quarks in a L=1 state and an antiquark in S-wave shows that several of such states are forbidden by a selection rule, which holds in the limit of flavour symmetry, to decay into a baryon and a meson final state. We identify the most promising \bar{10} multiplet for the classification of the Theta^+ and Xi^{--} particles recently discovered with the prediction of a narrow width for both of them.
|
1810.07196
|
Zhengkang Zhang
|
Raymond T. Co, Aaron Pierce, Zhengkang Zhang and Yue Zhao
|
Dark Photon Dark Matter Produced by Axion Oscillations
|
8 pages, 2 figues; v2: minor changes, matches journal version
|
Phys. Rev. D 99, 075002 (2019)
|
10.1103/PhysRevD.99.075002
|
LCTP-18-21
|
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Despite growing interest and extensive effort to search for ultralight dark
matter in the form of a hypothetical dark photon, how it fits into a consistent
cosmology is unclear. Several dark photon dark matter production mechanisms
proposed previously are known to have limitations, at least in certain mass
regimes of experimental interest. In this letter, we explore a novel mechanism,
where a coherently oscillating axion-like field can efficiently transfer its
energy density to a dark photon field via a tachyonic instability. The residual
axion relic is subsequently depleted via couplings to the visible sector,
leaving only the dark photon as dark matter. We ensure that the cosmologies of
both the axion and dark photon are consistent with existing constraints. We
find that the mechanism works for a broad range of dark photon masses,
including those of interest for ongoing experiments and proposed detection
techniques.
|
[
{
"created": "Tue, 16 Oct 2018 18:00:06 GMT",
"version": "v1"
},
{
"created": "Thu, 2 May 2019 17:21:11 GMT",
"version": "v2"
}
] |
2019-05-03
|
[
[
"Co",
"Raymond T.",
""
],
[
"Pierce",
"Aaron",
""
],
[
"Zhang",
"Zhengkang",
""
],
[
"Zhao",
"Yue",
""
]
] |
Despite growing interest and extensive effort to search for ultralight dark matter in the form of a hypothetical dark photon, how it fits into a consistent cosmology is unclear. Several dark photon dark matter production mechanisms proposed previously are known to have limitations, at least in certain mass regimes of experimental interest. In this letter, we explore a novel mechanism, where a coherently oscillating axion-like field can efficiently transfer its energy density to a dark photon field via a tachyonic instability. The residual axion relic is subsequently depleted via couplings to the visible sector, leaving only the dark photon as dark matter. We ensure that the cosmologies of both the axion and dark photon are consistent with existing constraints. We find that the mechanism works for a broad range of dark photon masses, including those of interest for ongoing experiments and proposed detection techniques.
|
1908.08657
|
Harleen Dahiya Dr.
|
Navdeep Kaur and Harleen Dahiya
|
Transverse momentum dependent parton distributions of pion in the
light-front holographic model
|
19 pages, 6 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Using the light-front holographic model, we study the transverse momentum
dependent parton distributions (TMDs) for the case of pion. At leading twist,
the unpolarized parton distribution function $ f_{1\pi}(x,\bfk^{2}) $ and the
Boer-Mulders function $ h_{1\pi}^{\bot}(x,\bfk^{2}) $ are obtained for pion. We
calculate both the functions using the light-front holographic model with spin
improved wave function and compare the predicted results with available results
of other models. In order to provide inputs in predicting future experimental
data, a LO evolution is performed from model scale to experimental scale for
the case of unpolarized parton distribution function $ f_{1\pi}(x,\bfk^{2}) $.
|
[
{
"created": "Fri, 23 Aug 2019 04:07:30 GMT",
"version": "v1"
}
] |
2019-08-26
|
[
[
"Kaur",
"Navdeep",
""
],
[
"Dahiya",
"Harleen",
""
]
] |
Using the light-front holographic model, we study the transverse momentum dependent parton distributions (TMDs) for the case of pion. At leading twist, the unpolarized parton distribution function $ f_{1\pi}(x,\bfk^{2}) $ and the Boer-Mulders function $ h_{1\pi}^{\bot}(x,\bfk^{2}) $ are obtained for pion. We calculate both the functions using the light-front holographic model with spin improved wave function and compare the predicted results with available results of other models. In order to provide inputs in predicting future experimental data, a LO evolution is performed from model scale to experimental scale for the case of unpolarized parton distribution function $ f_{1\pi}(x,\bfk^{2}) $.
|
2104.05419
|
Gautham Varma K
|
Lawrence Paul Horwitz, Vishnu S Namboothiri, Gautham Varma K, Asher
Yahalom, Yossi Strauss, Jacob Levitan
|
Raychaudhuri Equation,Geometrical Flows and Geometrical Entropy
| null | null | null | null |
gr-qc
|
http://creativecommons.org/licenses/by/4.0/
|
Raychaudhuri equation is derived by assuming geometric flow in spacetime M of
n+1 dimensions. The equation turns into a harmonic oscillator form under
suitable transformations.Thereby a relation between geometrical entropy and
mean geodesic deviation is established. This has a connection to chaos theory
where the trajectories diverge exponentially. We discuss its application to
cosmology and black holes. Thus we present a connection between chaos theory
and general relativity.
|
[
{
"created": "Mon, 12 Apr 2021 12:52:01 GMT",
"version": "v1"
}
] |
2021-04-13
|
[
[
"Horwitz",
"Lawrence Paul",
""
],
[
"Namboothiri",
"Vishnu S",
""
],
[
"K",
"Gautham Varma",
""
],
[
"Yahalom",
"Asher",
""
],
[
"Strauss",
"Yossi",
""
],
[
"Levitan",
"Jacob",
""
]
] |
Raychaudhuri equation is derived by assuming geometric flow in spacetime M of n+1 dimensions. The equation turns into a harmonic oscillator form under suitable transformations.Thereby a relation between geometrical entropy and mean geodesic deviation is established. This has a connection to chaos theory where the trajectories diverge exponentially. We discuss its application to cosmology and black holes. Thus we present a connection between chaos theory and general relativity.
|
hep-ph/9412372
| null |
Zurab Berezhiani
|
Solving SUSY GUT Problems: Gauge Hierarchy and Fermion Masses
|
18 pages, LATEX, 3 figures included. Some minor latex and textual
errors are corrected, and few refs. are added
| null | null |
INFN-FE 14-94
|
hep-ph
| null |
The supersymmetric $SU(6)$ model accompanied by the flavour-blind discrete
symmetry $Z_3$ can succesfully deal with such key problems of SUSY GUTs, as are
the gauge hierarchy/doublet-triplet splitting, $\mu$-problem and flavour
problem. The Higgs doublets arise as Goldstone modes of the spontaneously
broken {\em accidental} global $SU(6)\times U(6)$ symmetry of the Higgs
superpotential. Their couplings to fermions have peculiarities leading to the
consistent picture of the quark and lepton masses and mixing, without invoking
any of horizontal symmetry/zero texture concepts. In particular, the only
particle that has direct Yukawa coupling with the Higgs doublet is top quark.
Other fermion masses appear from the higher order operators, with natural mass
hierarchy. Specific mass formulas are also obtained. [On the basis of talks
given at the Int. Workshop "Physics from Planck Scale to Electroweak Scale",
Warsaw, Poland, 21-24 September 1994, and at the III Trieste Conference "Recent
Developments in the Phenomenology of Particle Physics", Trieste, Italy, 3-7
October 1994.]
|
[
{
"created": "Mon, 26 Dec 1994 20:08:02 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Dec 1994 10:01:29 GMT",
"version": "v2"
}
] |
2008-02-03
|
[
[
"Berezhiani",
"Zurab",
""
]
] |
The supersymmetric $SU(6)$ model accompanied by the flavour-blind discrete symmetry $Z_3$ can succesfully deal with such key problems of SUSY GUTs, as are the gauge hierarchy/doublet-triplet splitting, $\mu$-problem and flavour problem. The Higgs doublets arise as Goldstone modes of the spontaneously broken {\em accidental} global $SU(6)\times U(6)$ symmetry of the Higgs superpotential. Their couplings to fermions have peculiarities leading to the consistent picture of the quark and lepton masses and mixing, without invoking any of horizontal symmetry/zero texture concepts. In particular, the only particle that has direct Yukawa coupling with the Higgs doublet is top quark. Other fermion masses appear from the higher order operators, with natural mass hierarchy. Specific mass formulas are also obtained. [On the basis of talks given at the Int. Workshop "Physics from Planck Scale to Electroweak Scale", Warsaw, Poland, 21-24 September 1994, and at the III Trieste Conference "Recent Developments in the Phenomenology of Particle Physics", Trieste, Italy, 3-7 October 1994.]
|
1006.1113
|
Eligio Lisi
|
G.L. Fogli, E. Lisi, A. Palazzo, A.M. Rotunno
|
Combined analysis of KamLAND and Borexino neutrino signals from Th and U
decays in the Earth's interior
|
12 pages, including 6 figures
|
Phys.Rev.D82:093006,2010
|
10.1103/PhysRevD.82.093006
| null |
hep-ph hep-ex nucl-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The KamLAND and Borexino experiments have detected electron antineutrinos
produced in the decay chains of natural thorium and uranium (Th and U
geoneutrinos). We analyze the energy spectra of current geoneutrino data in
combination with solar and long-baseline reactor neutrino data, with
marginalized three-neutrino oscillation parameters. We consider the case with
unconstrained Th and U event rates in KamLAND and Borexino, as well as cases
with fewer degrees of freedom, as obtained by successively assuming for both
experiments a common Th/U ratio, a common scaling of Th+U event rates, and a
chondritic Th/U value. In combination, KamLAND and Borexino can reject the null
hypothesis (no geoneutrino signal) at 5 sigma. Interesting bounds or
indications emerge on the Th+U geoneutrino rates and on the Th/U ratio, in
broad agreement with typical Earth model expectations. Conversely, the results
disfavor the hypothesis of a georeactor in the Earth's core, if its power
exceeds a few TW. The interplay of KamLAND and Borexino geoneutrino data is
highlighted.
|
[
{
"created": "Sun, 6 Jun 2010 16:30:58 GMT",
"version": "v1"
}
] |
2010-12-13
|
[
[
"Fogli",
"G. L.",
""
],
[
"Lisi",
"E.",
""
],
[
"Palazzo",
"A.",
""
],
[
"Rotunno",
"A. M.",
""
]
] |
The KamLAND and Borexino experiments have detected electron antineutrinos produced in the decay chains of natural thorium and uranium (Th and U geoneutrinos). We analyze the energy spectra of current geoneutrino data in combination with solar and long-baseline reactor neutrino data, with marginalized three-neutrino oscillation parameters. We consider the case with unconstrained Th and U event rates in KamLAND and Borexino, as well as cases with fewer degrees of freedom, as obtained by successively assuming for both experiments a common Th/U ratio, a common scaling of Th+U event rates, and a chondritic Th/U value. In combination, KamLAND and Borexino can reject the null hypothesis (no geoneutrino signal) at 5 sigma. Interesting bounds or indications emerge on the Th+U geoneutrino rates and on the Th/U ratio, in broad agreement with typical Earth model expectations. Conversely, the results disfavor the hypothesis of a georeactor in the Earth's core, if its power exceeds a few TW. The interplay of KamLAND and Borexino geoneutrino data is highlighted.
|
1409.4180
|
Fumihiro Kaneko
|
Takeshi Araki, Fumihiro Kaneko, Yasufumi Konishi, Toshihiko Ota, Joe
Sato, Takashi Shimomura
|
Mind the gap on Icecube: Cosmic neutrino spectrum and muon anomalous
magnetic moment in the gauged L_{\mu} - L_{\tau} model
|
5 pages,7 figures: v2; references added, z dependence of cosmic
neutrino energy included, conclusion unchanged
|
Phys. Rev. D 91, 037301 (2015)
|
10.1103/PhysRevD.91.037301
|
STUPP-14-219
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The energy spectrum of cosmic neutrinos, which was recently reported by the
IceCube collaboration, shows a gap between 400 TeV and 1 PeV. An unknown
neutrino interaction mediated by a field with a mass of the MeV scale is one of
the possible solutions to this gap. We examine if the leptonic gauge
interaction L_{\mu} - L_{\tau} can simultaneously explain the two phenomena in
the lepton sector: the gap in the cosmic neutrino spectrum and the unsettled
disagreement in muon anomalous magnetic moment. We illustrate that there
remains the regions in the model parameter space, which account for both the
problems. Our results also provide a hint for the distance to the source of the
high-energy cosmic neutrinos.
|
[
{
"created": "Mon, 15 Sep 2014 08:36:44 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Oct 2014 10:53:42 GMT",
"version": "v2"
}
] |
2015-03-05
|
[
[
"Araki",
"Takeshi",
""
],
[
"Kaneko",
"Fumihiro",
""
],
[
"Konishi",
"Yasufumi",
""
],
[
"Ota",
"Toshihiko",
""
],
[
"Sato",
"Joe",
""
],
[
"Shimomura",
"Takashi",
""
]
] |
The energy spectrum of cosmic neutrinos, which was recently reported by the IceCube collaboration, shows a gap between 400 TeV and 1 PeV. An unknown neutrino interaction mediated by a field with a mass of the MeV scale is one of the possible solutions to this gap. We examine if the leptonic gauge interaction L_{\mu} - L_{\tau} can simultaneously explain the two phenomena in the lepton sector: the gap in the cosmic neutrino spectrum and the unsettled disagreement in muon anomalous magnetic moment. We illustrate that there remains the regions in the model parameter space, which account for both the problems. Our results also provide a hint for the distance to the source of the high-energy cosmic neutrinos.
|
hep-ph/9606354
|
Tom Browder
|
T.E. Browder (University of Hawaii), K. Honscheid (Ohio State
University), and Daniele Pedrini (Istituto Nazionale di Fisica Nucleare -
sezione di Milano)
|
Nonleptonic Decays and Lifetimes of b-quark and c-quark Hadrons
|
74 pages, LATEX format with 12 figures. To appear in Annual Review of
Nuclear and Particle Science, Vol. 46. Also available at
http://www-physics.mps.ohio-state.edu/~phys111/b-physics/bphysics.html and by
anonymous ftp from ftp://pacific.mps.ohio-state.edu/pub/hepex/kh A serious
typographical error on p. 8 is corrected. Other errors and typos are also
corrected
|
Ann.Rev.Nucl.Part.Sci.46:395-469,1996
|
10.1146/annurev.nucl.46.1.395
|
UH 511-848-96, OHSTPY-HEP-E-96-006
|
hep-ph
| null |
We review recent experimental results on lifetimes and hadronic decays of
hadrons that contain $c$ and $b$ quarks. The theoretical implications of these
results are also considered. An understanding of hadronic decays of heavy
quarks is required to interpret the CP violating asymmetries in $B$ decays that
will be observed in experiments planned for the near future.
|
[
{
"created": "Tue, 18 Jun 1996 01:39:07 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Jul 1996 20:58:13 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Browder",
"T. E.",
"",
"University of Hawaii"
],
[
"Honscheid",
"K.",
"",
"Ohio State\n University"
],
[
"Pedrini",
"Daniele",
"",
"Istituto Nazionale di Fisica Nucleare -\n sezione di Milano"
]
] |
We review recent experimental results on lifetimes and hadronic decays of hadrons that contain $c$ and $b$ quarks. The theoretical implications of these results are also considered. An understanding of hadronic decays of heavy quarks is required to interpret the CP violating asymmetries in $B$ decays that will be observed in experiments planned for the near future.
|
1006.3213
|
Sreerup Raychaudhuri
|
Biplob Bhattacherjee, Manoranjan Guchait, Sreerup Raychaudhuri, K.
Sridhar
|
Boosted Top Quark Signals for Heavy Vector Boson Excitations in a
Universal Extra Dimension Model
|
22 pages, 8 embedded figures
|
Phys.Rev.D82:055006,2010
|
10.1103/PhysRevD.82.055006
|
TIFR/TH/10-16
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In view of the fact that the $n = 1$ Kaluza-Klein (KK) modes in a model with
a Universal Extra Dimension (UED), could mimic supersymmetry signatures at the
LHC, it is necessary to look for the $n = 2$ KK modes, which have no analogues
in supersymmetry. We discuss the possibility of searching for heavy $n = 2$
vector boson resonances -- especially the $g_2$ -- through their decays to a
highly-boosted top quark-antiquark pair using recently-developed top-jet
tagging techniques in the hadronic channel. It is shown that $t\bar{t}$ signals
from the $n = 2$ gluon resonance are as efficient a discovery mode at the LHC
as dilepton channels from the $\gamma_2$ and $Z_2$ resonances.
|
[
{
"created": "Wed, 16 Jun 2010 13:45:08 GMT",
"version": "v1"
}
] |
2014-11-21
|
[
[
"Bhattacherjee",
"Biplob",
""
],
[
"Guchait",
"Manoranjan",
""
],
[
"Raychaudhuri",
"Sreerup",
""
],
[
"Sridhar",
"K.",
""
]
] |
In view of the fact that the $n = 1$ Kaluza-Klein (KK) modes in a model with a Universal Extra Dimension (UED), could mimic supersymmetry signatures at the LHC, it is necessary to look for the $n = 2$ KK modes, which have no analogues in supersymmetry. We discuss the possibility of searching for heavy $n = 2$ vector boson resonances -- especially the $g_2$ -- through their decays to a highly-boosted top quark-antiquark pair using recently-developed top-jet tagging techniques in the hadronic channel. It is shown that $t\bar{t}$ signals from the $n = 2$ gluon resonance are as efficient a discovery mode at the LHC as dilepton channels from the $\gamma_2$ and $Z_2$ resonances.
|
2403.17743
|
De-Liang Yao
|
Jin-Man Chen, Ze-Rui Liang, De-Liang Yao
|
Low-energy elastic (anti)neutrino-nucleon scattering in covariant baryon
chiral perturbation theory
|
25 pages, 8 figures, 2 tables
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The low-energy antineutrino- and neutrino-nucleon neutral current elastic
scattering is studied within the framework of the relativistic SU(2) baryon
chiral perturbation theory up to the order of $\mathcal{O}(p^3)$. We have
derived the model-independent hadronic amplitudes and extracted the form
factors from them. It is found that differential cross sections ${{\rm d}
\sigma}/{{\rm d} Q^2}$ for the processes of (anti)neutrino-proton scattering
are in good agreement with the existing MiniBooNE data in the $Q^2$ region
$[0.13,0.20]$ GeV$^2$, where nuclear effects are expected to be negligible. For
$Q^2\leq 0.13$ GeV$^2$, large deviation is observed, which is mainly owing to
the sizeable Pauli blocking effect. Comparisons with the simulation data
produced by the NuWro and GIENE Mento Carlo events generators are also
discussed. The chiral results obtained in this work can be utilized as inputs
in various nuclear models to achieve the goal of precise determination of the
strangeness axial vector form factor, in particular when the low-energy
MicroBooNE data are available in the near future.
|
[
{
"created": "Tue, 26 Mar 2024 14:31:33 GMT",
"version": "v1"
}
] |
2024-03-27
|
[
[
"Chen",
"Jin-Man",
""
],
[
"Liang",
"Ze-Rui",
""
],
[
"Yao",
"De-Liang",
""
]
] |
The low-energy antineutrino- and neutrino-nucleon neutral current elastic scattering is studied within the framework of the relativistic SU(2) baryon chiral perturbation theory up to the order of $\mathcal{O}(p^3)$. We have derived the model-independent hadronic amplitudes and extracted the form factors from them. It is found that differential cross sections ${{\rm d} \sigma}/{{\rm d} Q^2}$ for the processes of (anti)neutrino-proton scattering are in good agreement with the existing MiniBooNE data in the $Q^2$ region $[0.13,0.20]$ GeV$^2$, where nuclear effects are expected to be negligible. For $Q^2\leq 0.13$ GeV$^2$, large deviation is observed, which is mainly owing to the sizeable Pauli blocking effect. Comparisons with the simulation data produced by the NuWro and GIENE Mento Carlo events generators are also discussed. The chiral results obtained in this work can be utilized as inputs in various nuclear models to achieve the goal of precise determination of the strangeness axial vector form factor, in particular when the low-energy MicroBooNE data are available in the near future.
|
hep-ph/9502333
| null |
Meng-yuan Wang
|
On Constrained-Instanton Valleys
|
24 pages, harvmac, no figures, TEX twice, instructions at the
beginning of the file, additional discussion on the valley method included at
the end of Section 4
| null | null |
UTTG-21-94
|
hep-ph
| null |
We develop a systematic treatment for the quasi-zero modes, which play an
important role in nonabelian gauge theories. It can be used to derive the
analytic forms for the constrained instantons in the \ymh theory. This will
automatically sum up contributions to all orders in $\rho$, the instanton size.
We also give the analytic expressions for the instanton-antiinstanton pair,
with an arbitrary relative phase. We apply the results to the computation for
high energy baryon number violating cross section, as well as to Klinkhamer's
new instanton.
|
[
{
"created": "Fri, 17 Feb 1995 01:57:39 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Feb 1995 23:23:19 GMT",
"version": "v2"
},
{
"created": "Sat, 4 Mar 1995 02:04:00 GMT",
"version": "v3"
}
] |
2008-02-03
|
[
[
"Wang",
"Meng-yuan",
""
]
] |
We develop a systematic treatment for the quasi-zero modes, which play an important role in nonabelian gauge theories. It can be used to derive the analytic forms for the constrained instantons in the \ymh theory. This will automatically sum up contributions to all orders in $\rho$, the instanton size. We also give the analytic expressions for the instanton-antiinstanton pair, with an arbitrary relative phase. We apply the results to the computation for high energy baryon number violating cross section, as well as to Klinkhamer's new instanton.
|
1607.04937
|
Xing-Gang Wu
|
Hai-Bing Fu, Xing-Gang Wu, Wei Cheng, and Tao Zhong
|
The $\rho$-meson longitudinal leading-twist distribution amplitude
within QCD background field theory
|
10 pages, 5 figures. Revised version to be published in Phys.Rev.D
|
Phys. Rev. D 94, 074004 (2016)
|
10.1103/PhysRevD.94.074004
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We revisit the $\rho$-meson longitudinal leading-twist distribution amplitude
(DA) $\phi_{2;\rho}^\|$ by using the QCD sum rules approach within the
background field theory. To improve the accuracy of the sum rules for its
moments $\langle\xi_{n;\rho}^\|\rangle$, we include the next-to-leading order
QCD correction to the perturbative part and keep all non-perturbative
condensates up to dimension-six consistently within the background field
theory. The first two moments read $\langle \xi_{2;\rho}^\| \rangle|_{1{\rm
GeV}} = 0.241(28)$ and $\langle \xi_{4;\rho}^\| \rangle|_{1{\rm GeV}} =
0.109(10)$, indicating a double humped behavior for $\phi_{2;\rho}^\|$ at small
energy scale. As an application, we apply them to the $B\to \rho $ transition
form factors within the QCD light-cone sum rules, which are key components for
the decay width $\Gamma(B\to \rho \ell \nu_\ell)$. To compare with the
world-average of $\Gamma(B\to \rho \ell \nu_\ell)$ issued by Particle Data
Group, we predict $|V_{\rm ub}| = 3.19^{+0.65}_{-0.62}$, which agrees with the
BABAR and Omn\`{e}s parameterization prediction within errors.
|
[
{
"created": "Mon, 18 Jul 2016 02:31:30 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Sep 2016 13:09:22 GMT",
"version": "v2"
}
] |
2016-10-05
|
[
[
"Fu",
"Hai-Bing",
""
],
[
"Wu",
"Xing-Gang",
""
],
[
"Cheng",
"Wei",
""
],
[
"Zhong",
"Tao",
""
]
] |
We revisit the $\rho$-meson longitudinal leading-twist distribution amplitude (DA) $\phi_{2;\rho}^\|$ by using the QCD sum rules approach within the background field theory. To improve the accuracy of the sum rules for its moments $\langle\xi_{n;\rho}^\|\rangle$, we include the next-to-leading order QCD correction to the perturbative part and keep all non-perturbative condensates up to dimension-six consistently within the background field theory. The first two moments read $\langle \xi_{2;\rho}^\| \rangle|_{1{\rm GeV}} = 0.241(28)$ and $\langle \xi_{4;\rho}^\| \rangle|_{1{\rm GeV}} = 0.109(10)$, indicating a double humped behavior for $\phi_{2;\rho}^\|$ at small energy scale. As an application, we apply them to the $B\to \rho $ transition form factors within the QCD light-cone sum rules, which are key components for the decay width $\Gamma(B\to \rho \ell \nu_\ell)$. To compare with the world-average of $\Gamma(B\to \rho \ell \nu_\ell)$ issued by Particle Data Group, we predict $|V_{\rm ub}| = 3.19^{+0.65}_{-0.62}$, which agrees with the BABAR and Omn\`{e}s parameterization prediction within errors.
|
1501.03381
|
Elena G. Ferreiro
|
E. G. Ferreiro and C. Pajares
|
Open charm production in high multiplicity proton-proton events at the
LHC
|
7 pages, 2 figures
| null | null | null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present the dependence of $D$ production on the charged particle
multiplicity in proton-proton collisions at LHC energies. We show that, in a
framework of source coherence, the open charm production exhibits a growth with
the multiplicity which is stronger than linear in the high density domain. This
departure from linearity was previously observed in the $J/\psi$ inclusive data
from proton-proton collisions at 7 TeV and was successfully described in our
approach. Our assumption, the existence of coherence effects present in
proton-proton collisions at high energy, applies for high multiplicity
proton-proton collisions in the central rapidity region and should affect any
hard observable.
|
[
{
"created": "Wed, 14 Jan 2015 15:59:19 GMT",
"version": "v1"
}
] |
2015-01-15
|
[
[
"Ferreiro",
"E. G.",
""
],
[
"Pajares",
"C.",
""
]
] |
We present the dependence of $D$ production on the charged particle multiplicity in proton-proton collisions at LHC energies. We show that, in a framework of source coherence, the open charm production exhibits a growth with the multiplicity which is stronger than linear in the high density domain. This departure from linearity was previously observed in the $J/\psi$ inclusive data from proton-proton collisions at 7 TeV and was successfully described in our approach. Our assumption, the existence of coherence effects present in proton-proton collisions at high energy, applies for high multiplicity proton-proton collisions in the central rapidity region and should affect any hard observable.
|
0810.3779
|
Ashutosh Alok
|
Ashutosh Kumar Alok, Amol Dighe, S. Uma Sankar
|
Large forward-backward asymmetry in B --> K mu+ mu- from new physics
tensor operators
|
19 pages, 5 figures
|
Phys.Rev.D78:114025,2008
|
10.1103/PhysRevD.78.114025
|
TIFR/TH/08-41
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the constraints on possible new physics contribution to the
forward-backward asymmetry of muons, A_{FB}(q^2), in B --> K mu+ mu-. New
physics in the form of vector/axial-vector operators does not contribute to
A_{FB}(q^2) whereas new physics in the form of scalar/pseudoscalar operators
can enhance A_{FB}(q^2) only by a few per cent. However new physics the form of
tensor operators can take the peak value of A_{FB}(q^2) to as high as 40% near
the high-q^2 end point. In addition, if both scalar/pseudoscalar and tensor
operators are present, then A_{FB}(q^2) can be more than 15% for the entire
high-q^2 region q^2 > 15 GeV^2. The observation of significant A_{FB} would
imply the presence of new physics tensor operators, whereas its q^2 dependence
could further indicate the presence of new scalar/pseudoscalar physics.
|
[
{
"created": "Tue, 21 Oct 2008 09:18:00 GMT",
"version": "v1"
}
] |
2010-04-15
|
[
[
"Alok",
"Ashutosh Kumar",
""
],
[
"Dighe",
"Amol",
""
],
[
"Sankar",
"S. Uma",
""
]
] |
We study the constraints on possible new physics contribution to the forward-backward asymmetry of muons, A_{FB}(q^2), in B --> K mu+ mu-. New physics in the form of vector/axial-vector operators does not contribute to A_{FB}(q^2) whereas new physics in the form of scalar/pseudoscalar operators can enhance A_{FB}(q^2) only by a few per cent. However new physics the form of tensor operators can take the peak value of A_{FB}(q^2) to as high as 40% near the high-q^2 end point. In addition, if both scalar/pseudoscalar and tensor operators are present, then A_{FB}(q^2) can be more than 15% for the entire high-q^2 region q^2 > 15 GeV^2. The observation of significant A_{FB} would imply the presence of new physics tensor operators, whereas its q^2 dependence could further indicate the presence of new scalar/pseudoscalar physics.
|
0805.2836
|
Rubakov Valery
|
D. Gorbunov, A. Khmelnitsky and V. Rubakov
|
Is gravitino still a warm dark matter candidate?
|
18 pages, 5 figures. Replaced with journal version
|
JHEP 0812:055,2008
|
10.1088/1126-6708/2008/12/055
|
INR-TH-05-08-18
|
hep-ph astro-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We make use of the phase space density approach to discuss gravitino as a
warm dark matter candidate. Barring fine tuning between the reheat temperature
in the Universe and superparticle masses, we find that \emph{warm} gravitinos
have both appropriate total mass density, Omega_{\tilde G} = \Omega_{DM} \simeq
0.2, and suitable primordial phase space density at low momenta provided that
their mass is in the range 1 keV \lesssim \mg \lesssim 15 keV, the reheat
temperature in the Universe is low, T_R \lesssim 10 TeV, and masses of some of
the superparticles are sufficiently small, M \lesssim 350 GeV. The latter
property implies that the gravitino warm dark matter scenario will be either
ruled out or supported by the LHC experiments.
|
[
{
"created": "Mon, 19 May 2008 10:54:48 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Aug 2008 12:29:08 GMT",
"version": "v2"
},
{
"created": "Mon, 8 Dec 2008 13:54:48 GMT",
"version": "v3"
}
] |
2009-02-09
|
[
[
"Gorbunov",
"D.",
""
],
[
"Khmelnitsky",
"A.",
""
],
[
"Rubakov",
"V.",
""
]
] |
We make use of the phase space density approach to discuss gravitino as a warm dark matter candidate. Barring fine tuning between the reheat temperature in the Universe and superparticle masses, we find that \emph{warm} gravitinos have both appropriate total mass density, Omega_{\tilde G} = \Omega_{DM} \simeq 0.2, and suitable primordial phase space density at low momenta provided that their mass is in the range 1 keV \lesssim \mg \lesssim 15 keV, the reheat temperature in the Universe is low, T_R \lesssim 10 TeV, and masses of some of the superparticles are sufficiently small, M \lesssim 350 GeV. The latter property implies that the gravitino warm dark matter scenario will be either ruled out or supported by the LHC experiments.
|
1303.4707
|
Plyatsko Roman
|
Roman Plyatsko and Mykola Fenyk
|
Highly relativistic circular orbits of spinning particle in the Kerr
field
|
10 pages, 16 figures
|
Phys. Rev. D, v.87, 044019 (2013)
|
10.1103/PhysRevD.87.044019
| null |
gr-qc astro-ph.HE hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The Mathisson-Papapetrou equations in Kerr's background are considered. The
region of existence of highly relativistic planar circular orbits of a spinning
particle in this background and dependence of the particle's Lorentz
$\gamma$-factor on its spin and radial coordinate are investigated. It is shown
that in contrast to the highly relativistic circular orbits of a spinless
particle the corresponding orbits of a spinning particle are allowed in much
wider space region. Some of these orbits show the significant attractive action
of the spin-gravity coupling on a particle and others are caused by the
significant repulsive action. Numerical estimates for electrons, protons and
neutrinos in the gravitational field of black holes are presented.
|
[
{
"created": "Tue, 19 Mar 2013 19:25:41 GMT",
"version": "v1"
}
] |
2015-06-15
|
[
[
"Plyatsko",
"Roman",
""
],
[
"Fenyk",
"Mykola",
""
]
] |
The Mathisson-Papapetrou equations in Kerr's background are considered. The region of existence of highly relativistic planar circular orbits of a spinning particle in this background and dependence of the particle's Lorentz $\gamma$-factor on its spin and radial coordinate are investigated. It is shown that in contrast to the highly relativistic circular orbits of a spinless particle the corresponding orbits of a spinning particle are allowed in much wider space region. Some of these orbits show the significant attractive action of the spin-gravity coupling on a particle and others are caused by the significant repulsive action. Numerical estimates for electrons, protons and neutrinos in the gravitational field of black holes are presented.
|
hep-ph/0005044
|
Xin-Nian Wang
|
Xiaofeng Guo and Xin-Nian Wang
|
Multiple Scattering, Parton Energy Loss and Modified Fragmentation
Functions in Deeply Inelastic eA Scattering
|
4 Pages in RevTex with 2 ps figures, final version in Phys. Rev. Lett
|
Phys.Rev.Lett.85:3591-3594,2000
|
10.1103/PhysRevLett.85.3591
|
LBNL-45631
|
hep-ph nucl-th
| null |
Modified quark fragmentation functions in deeply inelastic $eA$ collisions
and their QCD evolution equations are derived for the first time in the
framework of multiple parton scattering. Induced radiation gives rise to
additional terms in the evolution equations and thus softens the modified quark
fragmentation functions. The results in the next-leading-twist depend on both
diagonal and off-diagonal twist-four parton distributions and the combination
of which clearly manifests the LPM interference pattern. The predicted
modification depends quadratically on the nuclear size ($A^{2/3}$).
Generalization to the case of hot QCD medium is also discussed.
|
[
{
"created": "Fri, 5 May 2000 00:42:10 GMT",
"version": "v1"
},
{
"created": "Sun, 7 May 2000 19:07:46 GMT",
"version": "v2"
},
{
"created": "Tue, 30 Jan 2001 23:27:34 GMT",
"version": "v3"
}
] |
2008-11-26
|
[
[
"Guo",
"Xiaofeng",
""
],
[
"Wang",
"Xin-Nian",
""
]
] |
Modified quark fragmentation functions in deeply inelastic $eA$ collisions and their QCD evolution equations are derived for the first time in the framework of multiple parton scattering. Induced radiation gives rise to additional terms in the evolution equations and thus softens the modified quark fragmentation functions. The results in the next-leading-twist depend on both diagonal and off-diagonal twist-four parton distributions and the combination of which clearly manifests the LPM interference pattern. The predicted modification depends quadratically on the nuclear size ($A^{2/3}$). Generalization to the case of hot QCD medium is also discussed.
|
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.