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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1004.3054
|
Pedro Bicudo
|
Pedro Bicudo
|
Confinement and chiral symmetry breaking, one or two critical points?
|
5 pages, 4 figures, contribution submitted to the XLVIII
International Winter Meeting on Nuclear Physics, BORMIO2010 January 25-29,
2010 Bormio, Italy
| null | null | null |
hep-ph hep-lat
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the QCD phase diagram, in particular we study the critical points of
the two main QCD phase transitions, confinement and chiral symmetry breaking.
Confinement drives chiral symmetry breaking, and, due to the finite quark mass,
at small density both transitions are a crossover, while they are a first or
second order phase transition in large density. We study the QCD phase diagram
with a quark potential model including both confinement and chiral symmetry.
This formalism, in the Coulomb gauge hamiltonian formalism of QCD, is presently
the only one able to microscopically include both a quark-antiquark confining
potential and a vacuum condensate of quark-antiquark pairs. Our order
parameters are the Polyakov loop and the quark mass gap. The confining
potential is extracted from the Lattice QCD data of the Bielefeld group. We
scan the QCD phase diagram for different quark masses, in order to address how
the quark masses affect the critical point location in the phase diagram.
|
[
{
"created": "Sun, 18 Apr 2010 19:40:55 GMT",
"version": "v1"
}
] |
2010-04-20
|
[
[
"Bicudo",
"Pedro",
""
]
] |
We study the QCD phase diagram, in particular we study the critical points of the two main QCD phase transitions, confinement and chiral symmetry breaking. Confinement drives chiral symmetry breaking, and, due to the finite quark mass, at small density both transitions are a crossover, while they are a first or second order phase transition in large density. We study the QCD phase diagram with a quark potential model including both confinement and chiral symmetry. This formalism, in the Coulomb gauge hamiltonian formalism of QCD, is presently the only one able to microscopically include both a quark-antiquark confining potential and a vacuum condensate of quark-antiquark pairs. Our order parameters are the Polyakov loop and the quark mass gap. The confining potential is extracted from the Lattice QCD data of the Bielefeld group. We scan the QCD phase diagram for different quark masses, in order to address how the quark masses affect the critical point location in the phase diagram.
|
1411.6222
|
Konstantin Astapov
|
K. O. Astapov, S. V. Demidov
|
Sgoldstino-Higgs mixing in models with low-scale supersymmetry breaking
|
34 pages, 14 figures. Reference has been added, misprints eliminated
| null |
10.1007/JHEP01(2015)136
|
INR-TH/2014-028
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider a supersymmetric extension of the Standard Model with low-scale
supersymmetry breaking. Besides usual superpartners it contains additional
chiral goldstino supermultiplet whose scalar components - sgoldstinos can mix
with scalars from the Higgs sector of the model. We show that this mixing can
have considerable impact on phenomenology of the lightest Higgs boson and
scalar sgoldstino. In particular, the latter can be a good candidate for
explanation of 2-sigma LEP excess with mass around 98 GeV.
|
[
{
"created": "Sun, 23 Nov 2014 10:39:36 GMT",
"version": "v1"
},
{
"created": "Sun, 1 Feb 2015 11:09:57 GMT",
"version": "v2"
}
] |
2015-02-03
|
[
[
"Astapov",
"K. O.",
""
],
[
"Demidov",
"S. V.",
""
]
] |
We consider a supersymmetric extension of the Standard Model with low-scale supersymmetry breaking. Besides usual superpartners it contains additional chiral goldstino supermultiplet whose scalar components - sgoldstinos can mix with scalars from the Higgs sector of the model. We show that this mixing can have considerable impact on phenomenology of the lightest Higgs boson and scalar sgoldstino. In particular, the latter can be a good candidate for explanation of 2-sigma LEP excess with mass around 98 GeV.
|
2312.13345
|
Da Liu
|
Hannah Day, Da Liu, Markus A. Luty, Yue Zhao
|
Blowing in the Dark Matter Wind
|
26 pages, 3 figures
| null | null | null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Interactions between dark matter and ordinary matter will transfer momentum,
and therefore give rise to a force on ordinary matter due to the dark matter
`wind.' We present a realistic model of dark matter where this force can be
maximal, meaning that an order-1 fraction of the dark matter momentum incident
on a target of ordinary matter is reflected. The model consists of light m_\phi
\sim eV scalar dark matter with an effective interaction \phi^2 \bar{\psi}\psi,
where \psi is an electron or nucleon field. If the coupling is repulsive and
sufficiently strong, the field \phi is excluded from ordinary matter, analogous
to the Meissner effect for photons in a superconductor. We show that there is a
large region of parameter space that is compatible with existing constraints,
and which can be probed by sensitive force experiments, such as satellite tests
of the equivalence principle and torsion balance experiments.
|
[
{
"created": "Wed, 20 Dec 2023 19:00:01 GMT",
"version": "v1"
}
] |
2023-12-22
|
[
[
"Day",
"Hannah",
""
],
[
"Liu",
"Da",
""
],
[
"Luty",
"Markus A.",
""
],
[
"Zhao",
"Yue",
""
]
] |
Interactions between dark matter and ordinary matter will transfer momentum, and therefore give rise to a force on ordinary matter due to the dark matter `wind.' We present a realistic model of dark matter where this force can be maximal, meaning that an order-1 fraction of the dark matter momentum incident on a target of ordinary matter is reflected. The model consists of light m_\phi \sim eV scalar dark matter with an effective interaction \phi^2 \bar{\psi}\psi, where \psi is an electron or nucleon field. If the coupling is repulsive and sufficiently strong, the field \phi is excluded from ordinary matter, analogous to the Meissner effect for photons in a superconductor. We show that there is a large region of parameter space that is compatible with existing constraints, and which can be probed by sensitive force experiments, such as satellite tests of the equivalence principle and torsion balance experiments.
|
hep-ph/9401250
|
PostDoc Its
|
R. Foot, X.-G. He, H. Lew and R. R. Volkas
|
Model for a Light Z' Boson
|
20 pages + 5 pages of figures (appended as postscipt files), LaTeX,
OITS-532
|
Phys.Rev. D50 (1994) 4571-4580
|
10.1103/PhysRevD.50.4571
| null |
hep-ph
| null |
A model of a light $Z'$ boson is constructed and phenomenological bounds are
derived. This $Z'$ boson arises from a very simple extension to the Standard
Model, and it is constrained to be light because the vacuum expectation values
which generate its mass also break the electroweak gauge group. It is difficult
to detect experimentally because it couples exclusively or primarily (depending
on symmetry breaking details) to second and third generation leptons. However,
if the $Z'$ boson is sufficiently light, then there exists the possibility of
the two-body decay $\tau \rightarrow \mu Z'$ occuring. This will provide a
striking signature to test the model.
|
[
{
"created": "Thu, 13 Jan 1994 23:55:02 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Foot",
"R.",
""
],
[
"He",
"X. -G.",
""
],
[
"Lew",
"H.",
""
],
[
"Volkas",
"R. R.",
""
]
] |
A model of a light $Z'$ boson is constructed and phenomenological bounds are derived. This $Z'$ boson arises from a very simple extension to the Standard Model, and it is constrained to be light because the vacuum expectation values which generate its mass also break the electroweak gauge group. It is difficult to detect experimentally because it couples exclusively or primarily (depending on symmetry breaking details) to second and third generation leptons. However, if the $Z'$ boson is sufficiently light, then there exists the possibility of the two-body decay $\tau \rightarrow \mu Z'$ occuring. This will provide a striking signature to test the model.
|
2009.03909
|
Renato Fonseca
|
Andreas Ekstedt, Renato M. Fonseca and Michal Malinsk\'y
|
Flavorgenesis
|
9 pages
| null |
10.1016/j.physletb.2021.136212
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a model where all fermions are contained in a single irreducible
representation of an SU(19) gauge symmetry group. If there is only one scalar
field, Yukawa interactions are controlled by a single number rather than by one
or more $3\times3$ matrices of couplings. The low-energy concept of flavor
emerges entirely from the scalar-sector parameters; more specifically, entries
of the Standard Model Yukawa matrices are controlled by several vacuum
expectation values.
|
[
{
"created": "Tue, 8 Sep 2020 18:00:02 GMT",
"version": "v1"
}
] |
2021-03-17
|
[
[
"Ekstedt",
"Andreas",
""
],
[
"Fonseca",
"Renato M.",
""
],
[
"Malinský",
"Michal",
""
]
] |
We present a model where all fermions are contained in a single irreducible representation of an SU(19) gauge symmetry group. If there is only one scalar field, Yukawa interactions are controlled by a single number rather than by one or more $3\times3$ matrices of couplings. The low-energy concept of flavor emerges entirely from the scalar-sector parameters; more specifically, entries of the Standard Model Yukawa matrices are controlled by several vacuum expectation values.
|
1408.3545
|
Evangelos Matsinos
|
Evangelos Matsinos and G\"unther Rasche
|
The propagation of a massive spin-$\frac{3}{2}$ field, with application
to $\pi N$ scattering
|
36 pages, 1 table, 3 figures
| null | null | null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the present paper, we investigate the propagation of a massive
spin-$\frac{3}{2}$ field, aiming at a direct application in hadronic models of
the pion-nucleon ($\pi N$) interaction. Suitable expressions for the
contributions to the standard invariant amplitudes $A$ and $B$ are derived,
applicable in the general case of isospin decomposition. We first deal with the
details of the lengthy calculation involving the Rarita-Schwinger propagator
and confirm the validity of the expressions which had appeared in the
literature in the early 1970s. We subsequently derive the corresponding
contributions when following two other approaches, one featuring the Williams
propagator, the other being known as Pascalutsa's method.
|
[
{
"created": "Fri, 15 Aug 2014 14:42:25 GMT",
"version": "v1"
}
] |
2014-08-18
|
[
[
"Matsinos",
"Evangelos",
""
],
[
"Rasche",
"Günther",
""
]
] |
In the present paper, we investigate the propagation of a massive spin-$\frac{3}{2}$ field, aiming at a direct application in hadronic models of the pion-nucleon ($\pi N$) interaction. Suitable expressions for the contributions to the standard invariant amplitudes $A$ and $B$ are derived, applicable in the general case of isospin decomposition. We first deal with the details of the lengthy calculation involving the Rarita-Schwinger propagator and confirm the validity of the expressions which had appeared in the literature in the early 1970s. We subsequently derive the corresponding contributions when following two other approaches, one featuring the Williams propagator, the other being known as Pascalutsa's method.
|
hep-ph/9305227
| null |
Tanguy Altherr and David Seibert
|
Thermal quark production in pure glue and quark gluon plasmas
|
7 pages, 5 figures (available upon request), CERN preprint
CERN-TH-6882/93
|
Phys.Lett. B313 (1993) 149-154; Erratum-ibid. B316 (1993) 633
|
10.1016/0370-2693(93)91204-Z
| null |
hep-ph nucl-th
| null |
We calculate production rates for massless $(u,d)$ and massive $(s,c,b)$
quarks in pure glue and quark gluon plasmas to leading order in the strong
coupling constant $g$. The leading contribution comes from gluon decay into
$q\bar q$ pairs, using a thermal gluon propagator with finite thermal mass and
damping rate. The rate behaves as $\alpha_S^2(\ln 1/\alpha_S)^2 T^4$ when $m,
\alpha_S \rightarrow 0$ and depends linearly on the transverse gluon damping
rate for all values of the quark mass $m$. The light quark ($u$, $d$, $s$)
chemical equilibration time is approximately 10-100 $T^{-1}$ for $g=$2-3, so
that quarks are likely to remain far from chemical equilibrium in
ultrarelativistic nuclear collisions.
|
[
{
"created": "Fri, 7 May 1993 17:24:23 GMT",
"version": "v1"
}
] |
2009-10-22
|
[
[
"Altherr",
"Tanguy",
""
],
[
"Seibert",
"David",
""
]
] |
We calculate production rates for massless $(u,d)$ and massive $(s,c,b)$ quarks in pure glue and quark gluon plasmas to leading order in the strong coupling constant $g$. The leading contribution comes from gluon decay into $q\bar q$ pairs, using a thermal gluon propagator with finite thermal mass and damping rate. The rate behaves as $\alpha_S^2(\ln 1/\alpha_S)^2 T^4$ when $m, \alpha_S \rightarrow 0$ and depends linearly on the transverse gluon damping rate for all values of the quark mass $m$. The light quark ($u$, $d$, $s$) chemical equilibration time is approximately 10-100 $T^{-1}$ for $g=$2-3, so that quarks are likely to remain far from chemical equilibrium in ultrarelativistic nuclear collisions.
|
1509.08125
|
Maarten F. L. Golterman
|
Diogo Boito, Anthony Francis, Maarten Golterman, Renwick Hudspith,
Randy Lewis, Kim Maltman, Santiago Peris
|
Low-energy constants from ALEPH hadronic tau decay data
|
6 pages, contribution to the proceedings of Chiral Dynamics 2015;
reference corrected
| null | null | null |
hep-ph hep-lat
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We determined the NLO chiral low-energy constant $L_{10}$, and various
combinations of NNLO chiral low-energy constants employing recently revised
ALEPH results for the non-strange vector (V) and axial-vector (A) hadronic tau
decay distributions and recently updated RBC/UKQCD lattice data for the
non-strange V-A two-point function. In this talk, we explain the ingredients of
this determination. Our errors are at or below the level expected for
contributions of yet higher order in the chiral expansion, suggesting that our
results exhaust the possibilities of what can be meaningfully achieved in an
NNLO analysis.
|
[
{
"created": "Sun, 27 Sep 2015 19:12:35 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Sep 2015 16:47:52 GMT",
"version": "v2"
}
] |
2015-10-01
|
[
[
"Boito",
"Diogo",
""
],
[
"Francis",
"Anthony",
""
],
[
"Golterman",
"Maarten",
""
],
[
"Hudspith",
"Renwick",
""
],
[
"Lewis",
"Randy",
""
],
[
"Maltman",
"Kim",
""
],
[
"Peris",
"Santiago",
""
]
] |
We determined the NLO chiral low-energy constant $L_{10}$, and various combinations of NNLO chiral low-energy constants employing recently revised ALEPH results for the non-strange vector (V) and axial-vector (A) hadronic tau decay distributions and recently updated RBC/UKQCD lattice data for the non-strange V-A two-point function. In this talk, we explain the ingredients of this determination. Our errors are at or below the level expected for contributions of yet higher order in the chiral expansion, suggesting that our results exhaust the possibilities of what can be meaningfully achieved in an NNLO analysis.
|
1411.1054
|
JiJi Fan
|
JiJi Fan, Matthew Reece and Lian-Tao Wang
|
Possible Futures of Electroweak Precision: ILC, FCC-ee, and CEPC
|
26 pages, 6 figures, minor modifications, references added and to
appear in JHEP
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The future of high-precision electroweak physics lies in e+e- collider
measurements of properties of the Z boson, the W boson, the Higgs boson, and
the top quark. We estimate the expected performance of three possible future
colliders: the ILC, FCC-ee (formerly known as TLEP), and CEPC. In particular,
we present the first estimates of the possible reach of CEPC, China's proposed
Circular Electron-Positron Collider, for the oblique parameters S and T and for
seven-parameter fits of Higgs couplings. These results allow the physics
potential for CEPC to be compared with that of the ILC and FCC-ee. We also show
how the constraints on S and T would evolve as the uncertainties on each of the
most important input measurements change separately. This clarifies the basic
physics goals for future colliders. To improve on the current precision, the
highest priorities are improving the uncertainties on the W mass and effective
weak mixing angle. At the same time, improved measurements of the top mass, the
Z mass, the running of alpha, and the Z width will offer further improvement
which will determine the ultimate reach. Each of the possible future colliders
we consider has strong prospects for probing TeV-scale electroweak physics.
|
[
{
"created": "Tue, 4 Nov 2014 21:00:00 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Sep 2015 18:37:03 GMT",
"version": "v2"
}
] |
2015-09-09
|
[
[
"Fan",
"JiJi",
""
],
[
"Reece",
"Matthew",
""
],
[
"Wang",
"Lian-Tao",
""
]
] |
The future of high-precision electroweak physics lies in e+e- collider measurements of properties of the Z boson, the W boson, the Higgs boson, and the top quark. We estimate the expected performance of three possible future colliders: the ILC, FCC-ee (formerly known as TLEP), and CEPC. In particular, we present the first estimates of the possible reach of CEPC, China's proposed Circular Electron-Positron Collider, for the oblique parameters S and T and for seven-parameter fits of Higgs couplings. These results allow the physics potential for CEPC to be compared with that of the ILC and FCC-ee. We also show how the constraints on S and T would evolve as the uncertainties on each of the most important input measurements change separately. This clarifies the basic physics goals for future colliders. To improve on the current precision, the highest priorities are improving the uncertainties on the W mass and effective weak mixing angle. At the same time, improved measurements of the top mass, the Z mass, the running of alpha, and the Z width will offer further improvement which will determine the ultimate reach. Each of the possible future colliders we consider has strong prospects for probing TeV-scale electroweak physics.
|
hep-ph/0209052
|
Michael Kuchiev
|
M. Yu. Kuchiev, V. V. Flambaum
|
Comment on ``Radiative corrections and parity nonconservation in heavy
atoms''
|
2 pages, revtex4
| null | null | null |
hep-ph nucl-th physics.atom-ph
| null |
Very brief summary of the most recent developments in an area of QED
corrections to the parity nonconservation in atoms is presented. Main
conclusion - experimental results of Wood et al do not contradict the standard
model
|
[
{
"created": "Thu, 5 Sep 2002 02:00:58 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Kuchiev",
"M. Yu.",
""
],
[
"Flambaum",
"V. V.",
""
]
] |
Very brief summary of the most recent developments in an area of QED corrections to the parity nonconservation in atoms is presented. Main conclusion - experimental results of Wood et al do not contradict the standard model
|
1902.11138
|
Ricardo Heras
|
Ricardo Heras
|
Comment on "Monopole production via photon fusion and Drell-Yan
processes: MadGraph implementation and perturbativity via velocity-dependent
coupling and magnetic moment as novel features"
| null | null | null | null |
hep-ph hep-th physics.class-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In a recent study on monopole production [Eur. Phys. J. C (2018) 78: 966],
Baines et al added the potential of a magnetic dipole to the Wu-Yang potentials
for the Dirac monopole and claimed that this modified Wu-Yang configuration
does not affect the Dirac quantisation condition. In this comment, we argue
that their claim is incorrect by showing that their modified Wu-Yang
configuration leads to an infinite number of quantisation conditions. In their
study, they also incorrectly identified the magnetic field of the monopole with
the magnetic field of the Dirac string and its attached magnetic monopole.
|
[
{
"created": "Wed, 27 Feb 2019 18:55:13 GMT",
"version": "v1"
}
] |
2019-03-01
|
[
[
"Heras",
"Ricardo",
""
]
] |
In a recent study on monopole production [Eur. Phys. J. C (2018) 78: 966], Baines et al added the potential of a magnetic dipole to the Wu-Yang potentials for the Dirac monopole and claimed that this modified Wu-Yang configuration does not affect the Dirac quantisation condition. In this comment, we argue that their claim is incorrect by showing that their modified Wu-Yang configuration leads to an infinite number of quantisation conditions. In their study, they also incorrectly identified the magnetic field of the monopole with the magnetic field of the Dirac string and its attached magnetic monopole.
|
hep-ph/0210340
|
Ian Hinchliffe
|
Ian Hinchliffe
|
Use of Taus in ATLAS
|
Invited talk at the Seventh International Workshop on Tau Lepton
Physics (TAU02), Santa Cruz, Ca, USA, Sept 2002, 6 pages, LaTeX, 4 eps
figures
|
eConf C0209101 (2002) WE13
|
10.1016/S0920-5632(03)02182-0
| null |
hep-ph
| null |
At the LHC, new particles can be expected that decay to final states
involving taus. Examples are given from simulations by the ATLAS experiment
showing how such final states can be exploited.
|
[
{
"created": "Thu, 24 Oct 2002 20:18:18 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Hinchliffe",
"Ian",
""
]
] |
At the LHC, new particles can be expected that decay to final states involving taus. Examples are given from simulations by the ATLAS experiment showing how such final states can be exploited.
|
hep-ph/0410167
|
Vladimir Sauli
|
Vladimir Sauli
|
Some Analytical Aspects in Field Theories with Dynamical Mass Generation
|
published in Czech. J. Phys
| null |
10.1007/s10582-005-0129-4
| null |
hep-ph
| null |
The consequence of dynamical mass generation on the singularity structure of
propagators is discussed. First the phenomena of dynamical mass generation is
discussed in the framework of Euclidean gap equations, then a possible
Minkowski solution is looking for. The examples are reviewed and studied for
several models: Yukawa, QED, QCD and Wess-Zumino. It is argued that the absence
of propagator pole goes hand by hand with the nontrivial solution for mass
function. The consequences are discussed.
|
[
{
"created": "Tue, 12 Oct 2004 14:04:11 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Nov 2005 16:51:09 GMT",
"version": "v2"
}
] |
2009-11-10
|
[
[
"Sauli",
"Vladimir",
""
]
] |
The consequence of dynamical mass generation on the singularity structure of propagators is discussed. First the phenomena of dynamical mass generation is discussed in the framework of Euclidean gap equations, then a possible Minkowski solution is looking for. The examples are reviewed and studied for several models: Yukawa, QED, QCD and Wess-Zumino. It is argued that the absence of propagator pole goes hand by hand with the nontrivial solution for mass function. The consequences are discussed.
|
1304.1414
|
Vasiliki Mitsou
|
Vasiliki A. Mitsou (U. Valencia, IFIC)
|
Experimental status of particle and astroparticle searches for
supersymmetry
|
17 pages, 18 figures; invited plenary talk in 3rd Symposium on
Prospects in the Physics of Discrete Symmetries (DISCRETE 2012), 3-7 Dec
2012, Lisbon, Portugal; submitted to Journal of Physics: Conference Series
|
J.Phys.Conf.Ser. 447 (2013) 012019
|
10.1088/1742-6596/447/1/012019
| null |
hep-ph astro-ph.CO hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
An overview of supersymmetry searches is presented, covering collider
experiments, direct and indirect searches for supersymmetric dark matter.
Recent LHC experimental results are reviewed, and the constraints from B-meson
decays are reported. Implications for supersymmetry of the latest direct and
indirect searches are thoroughly discussed. The focus is on the complementarity
of the various probes -- particle and astrophysical -- for constraining
Supersymmetry.
|
[
{
"created": "Thu, 4 Apr 2013 16:05:15 GMT",
"version": "v1"
}
] |
2015-11-11
|
[
[
"Mitsou",
"Vasiliki A.",
"",
"U. Valencia, IFIC"
]
] |
An overview of supersymmetry searches is presented, covering collider experiments, direct and indirect searches for supersymmetric dark matter. Recent LHC experimental results are reviewed, and the constraints from B-meson decays are reported. Implications for supersymmetry of the latest direct and indirect searches are thoroughly discussed. The focus is on the complementarity of the various probes -- particle and astrophysical -- for constraining Supersymmetry.
|
1402.4143
|
Viacheslav Bunichev
|
E. Boos (1), V. Bunichev (1), M. Dubinin (1), Y. Kurihara (2) ((1)
Skobeltsyn Institute of Nuclear Physics, Moscow State University, (2) High
Energy Accelerators Research Organization (KEK))
|
Expectations for the Higgs boson identification at the ILC
|
11 pages, 3 figures; corrected fig.2
| null | null |
SINP MSU 2014-2/885
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Deviations from the standard Higgs sector generated by some new physics at an
energy scale $\Lambda$ could be described by an effective $SU(3)_c \times
SU(2)_L \times U(1)$ invariant non-renormalizable Lagrangian terms of dimension
six. A systematic study of various Higgs boson production channels ($\gamma
\gamma$, $ZZ$, $WW$, $b \bar b$, $\tau \bar \tau$) at the International Linear
Collider (ILC) in the SM extension by effective operators is carried out.
Statistical methods are used to establish a degree of consistency for the
standard Higgs sector with the forthcoming data, using the expected ILC
accuracies of the Higgs boson production channels. Global fits in the
two-parametric anomalous coupling space indicating to possible deviations from
the standard Higgs-fermion and Higgs-gauge boson couplings are performed.
|
[
{
"created": "Mon, 17 Feb 2014 21:06:56 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Mar 2014 07:24:43 GMT",
"version": "v2"
}
] |
2014-03-13
|
[
[
"Boos",
"E.",
""
],
[
"Bunichev",
"V.",
""
],
[
"Dubinin",
"M.",
""
],
[
"Kurihara",
"Y.",
""
]
] |
Deviations from the standard Higgs sector generated by some new physics at an energy scale $\Lambda$ could be described by an effective $SU(3)_c \times SU(2)_L \times U(1)$ invariant non-renormalizable Lagrangian terms of dimension six. A systematic study of various Higgs boson production channels ($\gamma \gamma$, $ZZ$, $WW$, $b \bar b$, $\tau \bar \tau$) at the International Linear Collider (ILC) in the SM extension by effective operators is carried out. Statistical methods are used to establish a degree of consistency for the standard Higgs sector with the forthcoming data, using the expected ILC accuracies of the Higgs boson production channels. Global fits in the two-parametric anomalous coupling space indicating to possible deviations from the standard Higgs-fermion and Higgs-gauge boson couplings are performed.
|
hep-ph/9805473
|
Daniel J. H. Chung
|
Daniel J. H. Chung, Edward W. Kolb, Antonio Riotto
|
Nonthermal Supermassive Dark Matter
|
11 page LaTeX file. No major changes. Version accepted by PRL
|
Phys.Rev.Lett. 81 (1998) 4048-4051
|
10.1103/PhysRevLett.81.4048
|
Fermilab FERMILAB-Pub-98/154-A, CERN CERN-TH/98-160, Oxford U.
OUTP-98-40P
|
hep-ph astro-ph
| null |
We discuss several cosmological production mechanisms for nonthermal
supermassive dark matter and argue that dark matter may be elementary particles
of mass much greater than the weak scale. Searches for dark matter should not
be limited to weakly interacting particles with mass of the order of the weak
scale, but should extend into the supermassive range as well.
|
[
{
"created": "Wed, 27 May 1998 20:44:24 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Sep 1998 05:48:21 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Chung",
"Daniel J. H.",
""
],
[
"Kolb",
"Edward W.",
""
],
[
"Riotto",
"Antonio",
""
]
] |
We discuss several cosmological production mechanisms for nonthermal supermassive dark matter and argue that dark matter may be elementary particles of mass much greater than the weak scale. Searches for dark matter should not be limited to weakly interacting particles with mass of the order of the weak scale, but should extend into the supermassive range as well.
|
0910.4855
|
Vincent Mathieu
|
Vincent Mathieu
|
How Many Degrees of Freedom Has the Gluon ?
|
Invited talk at International Workshop on QCD Green's Functions,
Confinement, and Phenomenology (QCD-TNT09), Trento, Italy, 7-11 September
2009
|
PoS QCD-TNT09:024,2009
| null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In constituent models, glueballs are described as bound states of effective
gluons. The dynamical mass generation lead to a gluon mass without violating
gauge invariance. One can then consider three degrees of freedom for those
effective massive gluons. However, models with only two degrees of freedom are
shown to be in better agreement with the lattice glueball spectrum. I review
both models for two- and three-gluon models and explain why even though the
gluon gains a mass, it behaves as a massless particle with only two degrees of
freedom.
|
[
{
"created": "Mon, 26 Oct 2009 10:59:23 GMT",
"version": "v1"
}
] |
2011-07-14
|
[
[
"Mathieu",
"Vincent",
""
]
] |
In constituent models, glueballs are described as bound states of effective gluons. The dynamical mass generation lead to a gluon mass without violating gauge invariance. One can then consider three degrees of freedom for those effective massive gluons. However, models with only two degrees of freedom are shown to be in better agreement with the lattice glueball spectrum. I review both models for two- and three-gluon models and explain why even though the gluon gains a mass, it behaves as a massless particle with only two degrees of freedom.
|
0911.0468
|
Olivier Pene
|
O. P\`ene, Ph. Boucaud, J.P. Leroy, A. Le Yaouanc, J. Micheli, J.
Rodr\'iguez-Quintero
|
A Ghost Story: Ghosts and Gluons in the IR regime of QCD
|
12 pages 6 figures
|
PoS QCD-TNT09:035,2009
| null |
LPT-Orsay/09-88
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss the different methods to obtain reliable informations about the
deep infra-red behaviour of the gluon and ghost Green functions in QCD. We
argue that a clever combination of analytical inputs and numerical ones is
necessary. We illustrate this statement about the distinction between two
classes of solutions of the ghost propagator Dyson-Schwinger equation (GPDSE).
We conclude that the solution II ("decoupling") with a finite renormalised
ghost dressing function at zero momentum is strongly favored by lattice QCD, We
derive a method to solve numerically the GPDSE using lattice inputs concerning
the gluon propagator. We derive an analytical small momentum expansion of the
Ghost dressing function. We prove from the large cut-off behaviour of the ghost
propagator renormalisation constant, $\widetilde Z_3$, that the bare ghost
dressing function is infinite at the infinite cut-off limit.
|
[
{
"created": "Tue, 3 Nov 2009 16:20:46 GMT",
"version": "v1"
}
] |
2011-07-14
|
[
[
"Pène",
"O.",
""
],
[
"Boucaud",
"Ph.",
""
],
[
"Leroy",
"J. P.",
""
],
[
"Yaouanc",
"A. Le",
""
],
[
"Micheli",
"J.",
""
],
[
"Rodríguez-Quintero",
"J.",
""
]
] |
We discuss the different methods to obtain reliable informations about the deep infra-red behaviour of the gluon and ghost Green functions in QCD. We argue that a clever combination of analytical inputs and numerical ones is necessary. We illustrate this statement about the distinction between two classes of solutions of the ghost propagator Dyson-Schwinger equation (GPDSE). We conclude that the solution II ("decoupling") with a finite renormalised ghost dressing function at zero momentum is strongly favored by lattice QCD, We derive a method to solve numerically the GPDSE using lattice inputs concerning the gluon propagator. We derive an analytical small momentum expansion of the Ghost dressing function. We prove from the large cut-off behaviour of the ghost propagator renormalisation constant, $\widetilde Z_3$, that the bare ghost dressing function is infinite at the infinite cut-off limit.
|
hep-ph/0703074
|
Herbert Karl Dreiner
|
Herbi K. Dreiner (Bonn), Jong Soo Kim (Bonn), Oleg Lebedev (CERN),
Marc Thormeier (Saclay)
|
Supersymmetric Jarlskog Invariants: the Neutrino Sector
|
10 pages, no figures
|
Phys.Rev.D76:015006,2007
|
10.1103/PhysRevD.76.015006
|
CERN-PH-TH/2007-042
|
hep-ph
| null |
We generalize the notion of the Jarlskog invariant to supersymmetric models
with right--handed neutrinos. This allows us to formulate basis--independent
necessary and sufficient conditions for CP conservation in such models.
|
[
{
"created": "Wed, 7 Mar 2007 11:56:11 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Dreiner",
"Herbi K.",
"",
"Bonn"
],
[
"Kim",
"Jong Soo",
"",
"Bonn"
],
[
"Lebedev",
"Oleg",
"",
"CERN"
],
[
"Thormeier",
"Marc",
"",
"Saclay"
]
] |
We generalize the notion of the Jarlskog invariant to supersymmetric models with right--handed neutrinos. This allows us to formulate basis--independent necessary and sufficient conditions for CP conservation in such models.
|
2010.12971
|
Jose De Jesus Aguilera Verdugo
|
J. Jesus Aguilera-Verdugo, Roger J. Hernandez-Pinto, German Rodrigo,
German F. R. Sborlini, William J. Torres Bobadilla
|
Mathematical properties of nested residues and their application to
multi-loop scattering amplitudes
|
29 pages + appendices, 11 figures
| null |
10.1007/JHEP02(2021)112
|
IFIC/20-30; DESY 20-172; MPP-2020-184
|
hep-ph hep-th math-ph math.MP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The computation of multi-loop multi-leg scattering amplitudes plays a key
role to improve the precision of theoretical predictions for particle physics
at high-energy colliders. In this work, we focus on the mathematical properties
of the novel integrand-level representation of Feynman integrals, which is
based on the Loop-Tree Duality (LTD). We explore the behaviour of the
multi-loop iterated residues and explicitly show, by developing a general
formal proof for the first time, that contributions associated to displaced
poles are cancelled out. The remaining residues, called nested residues as
originally introduced in Ref. \cite{Verdugo:2020kzh}, encode the relevant
physical information and are naturally mapped onto physical configurations
associated to nondisjoint on-shell states. By going further on the mathematical
structure of the nested residues, we prove that unphysical singularities
vanish, and show how the final expressions can be written by using only causal
denominators. In this way, we provide a mathematical proof for the all-loop
formulae presented in Ref. \cite{Aguilera-Verdugo:2020kzc}.
|
[
{
"created": "Sat, 24 Oct 2020 20:09:58 GMT",
"version": "v1"
}
] |
2021-03-17
|
[
[
"Aguilera-Verdugo",
"J. Jesus",
""
],
[
"Hernandez-Pinto",
"Roger J.",
""
],
[
"Rodrigo",
"German",
""
],
[
"Sborlini",
"German F. R.",
""
],
[
"Bobadilla",
"William J. Torres",
""
]
] |
The computation of multi-loop multi-leg scattering amplitudes plays a key role to improve the precision of theoretical predictions for particle physics at high-energy colliders. In this work, we focus on the mathematical properties of the novel integrand-level representation of Feynman integrals, which is based on the Loop-Tree Duality (LTD). We explore the behaviour of the multi-loop iterated residues and explicitly show, by developing a general formal proof for the first time, that contributions associated to displaced poles are cancelled out. The remaining residues, called nested residues as originally introduced in Ref. \cite{Verdugo:2020kzh}, encode the relevant physical information and are naturally mapped onto physical configurations associated to nondisjoint on-shell states. By going further on the mathematical structure of the nested residues, we prove that unphysical singularities vanish, and show how the final expressions can be written by using only causal denominators. In this way, we provide a mathematical proof for the all-loop formulae presented in Ref. \cite{Aguilera-Verdugo:2020kzc}.
|
2003.00112
|
Alfredo Iorio
|
Paolo Castorina, Alfredo Iorio, Daniele Lanteri, and Petr Lukes
|
Gluon Shadowing and Nuclear Entanglement
|
7 pages, 5 figures
| null |
10.1142/S0218301321500105
| null |
hep-ph hep-th quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Relying on previous results that link entanglement entropy and parton
distribution functions in deep inelastic scattering and focusing on the small
Bjorken scaling region we present here indications that gluon shadowing might
indeed be explained as due to a depletion of the entanglement entropy between
observed and unobserved degrees of freedom per nucleon within a nucleus with
respect to the free nucleon case. We apply to gluon shadowing the general Page
approach to the calculation of the entanglement entropy in bipartite systems,
giving physical motivations of the results.
|
[
{
"created": "Fri, 28 Feb 2020 23:16:39 GMT",
"version": "v1"
}
] |
2021-04-07
|
[
[
"Castorina",
"Paolo",
""
],
[
"Iorio",
"Alfredo",
""
],
[
"Lanteri",
"Daniele",
""
],
[
"Lukes",
"Petr",
""
]
] |
Relying on previous results that link entanglement entropy and parton distribution functions in deep inelastic scattering and focusing on the small Bjorken scaling region we present here indications that gluon shadowing might indeed be explained as due to a depletion of the entanglement entropy between observed and unobserved degrees of freedom per nucleon within a nucleus with respect to the free nucleon case. We apply to gluon shadowing the general Page approach to the calculation of the entanglement entropy in bipartite systems, giving physical motivations of the results.
|
1510.00389
|
Farinaldo Queiroz
|
Matthew G. Baring, Tathagata Ghosh, Farinaldo S. Queiroz, Kuver Sinha
|
New Limits on the Dark Matter Lifetime from Dwarf Spheroidal Galaxies
using Fermi-LAT
|
4 figures, 7 pages. Inclusion of PASS 8 event-class, maximum
likelihood analysis and a new figure concerning Reticulum-II. Accepted in
Physical Review D
|
Phys. Rev. D 93, 103009 (2016)
|
10.1103/PhysRevD.93.103009
|
CETUP2015-025
|
hep-ph astro-ph.HE hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Dwarf spheroidal galaxies (dSphs) are promising targets for the indirect
detection of dark matter through gamma-ray emission due to their proximity,
lack of astrophysical backgrounds and high dark matter density. They are often
used to place restrictive bounds on the dark matter annihilation cross section.
In this paper, we analyze six years of {\it Fermi}-LAT gamma-ray data from 19
dSphs that are satellites of the Milky Way, and derive from a stacked analysis
of 15 dSphs, robust 95\% confidence level lower limits on the dark matter
lifetime for several decay channels and dark matter masses between $\sim 1$GeV
and $10$TeV. Our findings are based on a bin-by-bin maximum likelihood analysis
treating the J-factor as a nuisance parameter using PASS 8 event-class. Our
constraints from this ensemble are among the most stringent and solid in the
literature, and competitive with existing ones coming from the extragalactic
gamma-ray background, galaxy clusters, AMS-02 cosmic ray data, Super-K and
ICECUBE neutrino data, while rather insensitive to systematic uncertainties. In
particular, among gamma-ray searches, we improve existing limits for dark
matter decaying into $\bar{b}b$, ($\mu^+\mu^-$) for DM masses below $\sim 30\,
(200)$~GeV, demonstrating that dSphs are compelling targets for constraining
dark matter decay lifetimes.
|
[
{
"created": "Thu, 1 Oct 2015 20:03:33 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Nov 2015 10:44:18 GMT",
"version": "v2"
},
{
"created": "Tue, 26 Apr 2016 22:53:12 GMT",
"version": "v3"
}
] |
2016-06-01
|
[
[
"Baring",
"Matthew G.",
""
],
[
"Ghosh",
"Tathagata",
""
],
[
"Queiroz",
"Farinaldo S.",
""
],
[
"Sinha",
"Kuver",
""
]
] |
Dwarf spheroidal galaxies (dSphs) are promising targets for the indirect detection of dark matter through gamma-ray emission due to their proximity, lack of astrophysical backgrounds and high dark matter density. They are often used to place restrictive bounds on the dark matter annihilation cross section. In this paper, we analyze six years of {\it Fermi}-LAT gamma-ray data from 19 dSphs that are satellites of the Milky Way, and derive from a stacked analysis of 15 dSphs, robust 95\% confidence level lower limits on the dark matter lifetime for several decay channels and dark matter masses between $\sim 1$GeV and $10$TeV. Our findings are based on a bin-by-bin maximum likelihood analysis treating the J-factor as a nuisance parameter using PASS 8 event-class. Our constraints from this ensemble are among the most stringent and solid in the literature, and competitive with existing ones coming from the extragalactic gamma-ray background, galaxy clusters, AMS-02 cosmic ray data, Super-K and ICECUBE neutrino data, while rather insensitive to systematic uncertainties. In particular, among gamma-ray searches, we improve existing limits for dark matter decaying into $\bar{b}b$, ($\mu^+\mu^-$) for DM masses below $\sim 30\, (200)$~GeV, demonstrating that dSphs are compelling targets for constraining dark matter decay lifetimes.
|
hep-ph/0408322
|
Krishna Rajagopal
|
Kenji Fukushima (MIT, University of Tokyo), Chris Kouvaris (MIT),
Krishna Rajagopal (MIT)
|
Heating (Gapless) Color-Flavor Locked Quark Matter
|
24 pages; 22 figures; typos in labelling of Figs. 7, 20 corrected
|
Phys.Rev.D71:034002,2005
|
10.1103/PhysRevD.71.034002
|
MIT-CTP-3525
|
hep-ph cond-mat.supr-con nucl-th
| null |
We explore the phase diagram of neutral quark matter at high baryon density
as a function of the temperature T and the strange quark mass Ms. At T=0, there
is a sharp distinction between the insulating color-flavor locked (CFL) phase,
which occurs where Ms^2/mu < 2 Delta, and the metallic gapless CFL phase, which
occurs at larger Ms^2/mu. Here, mu is the chemical potential for quark number
and Delta is the gap in the CFL phase. We find this distinction blurred at
nonzero T, as the CFL phase undergoes an insulator-to-metal crossover when it
is heated. We present an analytic treatment of this crossover. At higher
temperatures, we map out the phase transition lines at which the gap parameters
Delta_1, Delta_2 and Delta_3 describing ds-pairing, us-pairing and ud-pairing
respectively, go to zero in an NJL model. For small values of Ms^2/mu, we find
that Delta_2 vanishes first, then Delta_1, then Delta_3. We find agreement with
a previous Ginzburg-Landau analysis of the form of these transitions and find
quantitative agreement with results obtained in full QCD at asymptotic density
for ratios of coefficients in the Ginzburg-Landau potential. At larger Ms^2/mu,
we find that Delta_1 vanishes first, then Delta_2, then Delta_3. Hence, we find
a "doubly critical'' point in the (Ms^2/mu,T)-plane at which two lines of
second order phase transitions (Delta_1->0 and Delta_2->0) cross. Because we do
not make any small-Ms approximation, if we choose a relatively strong coupling
leading to large gap parameters, we are able to pursue the analysis of the
phase diagram all the way up to such large values of Ms that there are no
strange quarks present.
|
[
{
"created": "Sat, 28 Aug 2004 03:03:27 GMT",
"version": "v1"
},
{
"created": "Tue, 31 Aug 2004 21:51:09 GMT",
"version": "v2"
}
] |
2014-11-18
|
[
[
"Fukushima",
"Kenji",
"",
"MIT, University of Tokyo"
],
[
"Kouvaris",
"Chris",
"",
"MIT"
],
[
"Rajagopal",
"Krishna",
"",
"MIT"
]
] |
We explore the phase diagram of neutral quark matter at high baryon density as a function of the temperature T and the strange quark mass Ms. At T=0, there is a sharp distinction between the insulating color-flavor locked (CFL) phase, which occurs where Ms^2/mu < 2 Delta, and the metallic gapless CFL phase, which occurs at larger Ms^2/mu. Here, mu is the chemical potential for quark number and Delta is the gap in the CFL phase. We find this distinction blurred at nonzero T, as the CFL phase undergoes an insulator-to-metal crossover when it is heated. We present an analytic treatment of this crossover. At higher temperatures, we map out the phase transition lines at which the gap parameters Delta_1, Delta_2 and Delta_3 describing ds-pairing, us-pairing and ud-pairing respectively, go to zero in an NJL model. For small values of Ms^2/mu, we find that Delta_2 vanishes first, then Delta_1, then Delta_3. We find agreement with a previous Ginzburg-Landau analysis of the form of these transitions and find quantitative agreement with results obtained in full QCD at asymptotic density for ratios of coefficients in the Ginzburg-Landau potential. At larger Ms^2/mu, we find that Delta_1 vanishes first, then Delta_2, then Delta_3. Hence, we find a "doubly critical'' point in the (Ms^2/mu,T)-plane at which two lines of second order phase transitions (Delta_1->0 and Delta_2->0) cross. Because we do not make any small-Ms approximation, if we choose a relatively strong coupling leading to large gap parameters, we are able to pursue the analysis of the phase diagram all the way up to such large values of Ms that there are no strange quarks present.
|
1401.1364
|
Jan Uphoff
|
Jan Uphoff, Oliver Fochler, Florian Senzel, Christian Wesp, Zhe Xu,
Carsten Greiner
|
Elliptic flow and nuclear modification factor in ultra-relativistic
heavy-ion collisions within a partonic transport model
|
5 pages, 5 figures
|
Phys. Rev. Lett. 114, 112301 (2015)
|
10.1103/PhysRevLett.114.112301
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The quark gluon plasma produced in ultra-relativistic heavy-ion collisions
exhibits remarkable features. It behaves like a nearly perfect liquid with a
small shear viscosity to entropy density ratio and leads to the quenching of
highly energetic particles. We show that both effects can be understood for the
first time within one common framework. Employing the parton cascade Boltzmann
Approach to Multi-Parton Scatterings (BAMPS), the microscopic interactions and
the space-time evolution of the quark gluon plasma are calculated by solving
the relativistic Boltzmann equation. Based on cross sections obtained from
perturbative QCD with explicitly taking the running coupling into account, we
calculate the nuclear modification factor and elliptic flow in
ultra-relativistic heavy-ion collisions. With only one single parameter
associated with coherence effects of medium-induced gluon radiation, the
experimental data of both observables can be understood on a microscopic level.
Furthermore, we show that perturbative QCD interactions with a running coupling
lead to a sufficiently small shear viscosity to entropy density ratio of the
quark gluon plasma, which provides a microscopic explanation for the
observations stated by hydrodynamic calculations.
|
[
{
"created": "Tue, 7 Jan 2014 13:18:28 GMT",
"version": "v1"
}
] |
2015-03-25
|
[
[
"Uphoff",
"Jan",
""
],
[
"Fochler",
"Oliver",
""
],
[
"Senzel",
"Florian",
""
],
[
"Wesp",
"Christian",
""
],
[
"Xu",
"Zhe",
""
],
[
"Greiner",
"Carsten",
""
]
] |
The quark gluon plasma produced in ultra-relativistic heavy-ion collisions exhibits remarkable features. It behaves like a nearly perfect liquid with a small shear viscosity to entropy density ratio and leads to the quenching of highly energetic particles. We show that both effects can be understood for the first time within one common framework. Employing the parton cascade Boltzmann Approach to Multi-Parton Scatterings (BAMPS), the microscopic interactions and the space-time evolution of the quark gluon plasma are calculated by solving the relativistic Boltzmann equation. Based on cross sections obtained from perturbative QCD with explicitly taking the running coupling into account, we calculate the nuclear modification factor and elliptic flow in ultra-relativistic heavy-ion collisions. With only one single parameter associated with coherence effects of medium-induced gluon radiation, the experimental data of both observables can be understood on a microscopic level. Furthermore, we show that perturbative QCD interactions with a running coupling lead to a sufficiently small shear viscosity to entropy density ratio of the quark gluon plasma, which provides a microscopic explanation for the observations stated by hydrodynamic calculations.
|
0706.1781
|
Marco Ruggieri
|
R. Anglani, R. Gatto, N. D. Ippolito, G. Nardulli and M. Ruggieri
|
Superfluid and Pseudo-Goldstone Modes in Three Flavor Crystalline Color
Superconductivity
|
10 pages, RevTeX4 class. Section IIIA enlarged, to appear on Phys.
Rev. D
|
Phys.Rev.D76:054007,2007
|
10.1103/PhysRevD.76.054007
|
BARI-TH 567/07
|
hep-ph
| null |
We study the bosonic excitations in the favorite cubic three flavor
crystalline LOFF phases of QCD. We calculate in the Ginzburg-Landau
approximation the masses of the eight pseudo Nambu-Goldstone Bosons (NGB)
present in the low energy theory. We also compute the decay constants of the
massless NGB Goldstones associated to superfluidity as well as those of the
eight pseudo NGB. Differently from the corresponding situation in the
Color-Flavor-Locking phase, we find that meson condensation phases are not
expected in the present scenario.
|
[
{
"created": "Wed, 13 Jun 2007 14:42:47 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Aug 2007 07:20:21 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Anglani",
"R.",
""
],
[
"Gatto",
"R.",
""
],
[
"Ippolito",
"N. D.",
""
],
[
"Nardulli",
"G.",
""
],
[
"Ruggieri",
"M.",
""
]
] |
We study the bosonic excitations in the favorite cubic three flavor crystalline LOFF phases of QCD. We calculate in the Ginzburg-Landau approximation the masses of the eight pseudo Nambu-Goldstone Bosons (NGB) present in the low energy theory. We also compute the decay constants of the massless NGB Goldstones associated to superfluidity as well as those of the eight pseudo NGB. Differently from the corresponding situation in the Color-Flavor-Locking phase, we find that meson condensation phases are not expected in the present scenario.
|
1505.04067
|
Antoni Szczurek
|
Antoni Szczurek
|
A short review of some double-parton scattering processes
|
10 pages, 9 figures, invited talk at the Excited QCD 2015, Tatranska
Lomnica, Slovakia, 8-14 March 2015. arXiv admin note: text overlap with
arXiv:1504.06491, order of figures changed, references added
| null | null | null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A few examples of quickly developing field of double parton scattering are
discussed. We present arguments that the production of two pairs of charm
quark-antiquark is the golden reaction to study the double parton scattering
effects. We discuss briefly also mechanism of single parton scattering and show
that it gives much smaller contribution to the $c \bar c c \bar c$ final state.
In this context we discuss also the contribution of perturbative
parton-splitting mechanism which should also be added to the conventional DPS
mechanism. The presence of the letter leads to collision energy and other
kinematical variables dependence of so-called $\sigma_{eff}$. We briefly
discuss production of four jets. We concentrate on estimation of the
contribution of DPS for jets widely separated in rapidity. Finally we briefly
mention about DPS effects in production of $W^+ W^-$.
|
[
{
"created": "Fri, 15 May 2015 13:56:19 GMT",
"version": "v1"
},
{
"created": "Tue, 19 May 2015 07:35:53 GMT",
"version": "v2"
}
] |
2015-05-20
|
[
[
"Szczurek",
"Antoni",
""
]
] |
A few examples of quickly developing field of double parton scattering are discussed. We present arguments that the production of two pairs of charm quark-antiquark is the golden reaction to study the double parton scattering effects. We discuss briefly also mechanism of single parton scattering and show that it gives much smaller contribution to the $c \bar c c \bar c$ final state. In this context we discuss also the contribution of perturbative parton-splitting mechanism which should also be added to the conventional DPS mechanism. The presence of the letter leads to collision energy and other kinematical variables dependence of so-called $\sigma_{eff}$. We briefly discuss production of four jets. We concentrate on estimation of the contribution of DPS for jets widely separated in rapidity. Finally we briefly mention about DPS effects in production of $W^+ W^-$.
|
1605.01630
|
Qin Chang
|
Qin Chang, Pan-Pan Li, Xiao-Hui Hu and Lin Han
|
Study of Nonleptonic $B^{\ast}_{(s)}\to M_1 M_2$ $(M=D$, $D_s$, $\pi$,
$K)$ Weak Decays with Factorization Approach
|
17 pages, 5 tables, the version published in International Journal of
Modern Physics A
|
Int.J.Mod.Phys. A30 (2015) no.27, 1550162
|
10.1142/S0217751X15501626
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Motivated by the experiments of heavy flavor physics at running LHC and
upgrading SuperKEKB/Belle-II in the future, the nonleptonic $B^{\ast}_{(s)}\to
M_1 M_2$ $(M=D$, $D_s$, $\pi$, $K)$ weak decays are studied in this paper. The
amplitudes are calculated with factorization approach, and the transition form
factors $A_0^{B^{\ast}_{(s)}\to M_1}(0)$ are evaluated within BSW model. With
the reasonable approximation $\Gamma_{tot}(B^*_{(s)})\simeq \Gamma(B^*_{(s)}\to
B_{(s)}\gamma)$, our predictions of branching fractions are presented.
Numerically, the CKM-favored tree-dominated $\bar{B}^{*0} \to D^+D^-_s$ and
$\bar{B}^{*0}_s \to D^+_sD^-_s$ decays have the largest branching fractions of
the order $\sim{\cal O}(10^{-8})$, and hence will be firstly observed by
forthcoming Belle-II experiment. However, most of the other decay modes have
the branching fractions~$<{\cal O}(10^{-9})$ and thus are hardly to be observed
soon. Besides, for the possible detectable $B^{\ast}_{(s)}$ decays with
branching fractions $\gtrsim{\cal O}(10^{-9})$, some useful ratios, such as
$R_D$ {\it et al.,} are presented and discussed in detail.
|
[
{
"created": "Thu, 5 May 2016 15:49:26 GMT",
"version": "v1"
}
] |
2016-05-06
|
[
[
"Chang",
"Qin",
""
],
[
"Li",
"Pan-Pan",
""
],
[
"Hu",
"Xiao-Hui",
""
],
[
"Han",
"Lin",
""
]
] |
Motivated by the experiments of heavy flavor physics at running LHC and upgrading SuperKEKB/Belle-II in the future, the nonleptonic $B^{\ast}_{(s)}\to M_1 M_2$ $(M=D$, $D_s$, $\pi$, $K)$ weak decays are studied in this paper. The amplitudes are calculated with factorization approach, and the transition form factors $A_0^{B^{\ast}_{(s)}\to M_1}(0)$ are evaluated within BSW model. With the reasonable approximation $\Gamma_{tot}(B^*_{(s)})\simeq \Gamma(B^*_{(s)}\to B_{(s)}\gamma)$, our predictions of branching fractions are presented. Numerically, the CKM-favored tree-dominated $\bar{B}^{*0} \to D^+D^-_s$ and $\bar{B}^{*0}_s \to D^+_sD^-_s$ decays have the largest branching fractions of the order $\sim{\cal O}(10^{-8})$, and hence will be firstly observed by forthcoming Belle-II experiment. However, most of the other decay modes have the branching fractions~$<{\cal O}(10^{-9})$ and thus are hardly to be observed soon. Besides, for the possible detectable $B^{\ast}_{(s)}$ decays with branching fractions $\gtrsim{\cal O}(10^{-9})$, some useful ratios, such as $R_D$ {\it et al.,} are presented and discussed in detail.
|
hep-ph/0512028
|
Dirk Zerwas
|
R. Lafaye, T.Plehn, D. Zerwas
|
SUSY parameter determination
|
Invited talk at 2005 International Linear Collider Physics and
Detector Workshop and Second ILC Accelerator Workshop, Snowmass,
CO(Snowmass05) 3 pages, LaTeX
| null | null |
LAL 05-173
|
hep-ph
| null |
The impact of the LHC, SLHC and the ILC on the precision of the determination
of supersymmetric parameters is investigated. In particular, in the point SPS1a
the measurements performed at the ILC will improve by an order of magnitude the
precision obtained by the LHC alone. The SLHC with respect to the LHC has the
potential to reduce the errors by a factor two.
|
[
{
"created": "Fri, 2 Dec 2005 10:51:55 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Lafaye",
"R.",
""
],
[
"Plehn",
"T.",
""
],
[
"Zerwas",
"D.",
""
]
] |
The impact of the LHC, SLHC and the ILC on the precision of the determination of supersymmetric parameters is investigated. In particular, in the point SPS1a the measurements performed at the ILC will improve by an order of magnitude the precision obtained by the LHC alone. The SLHC with respect to the LHC has the potential to reduce the errors by a factor two.
|
hep-ph/9910393
|
Motohiko Yoshimura
|
Sh. Matsumoto and M. Yoshimura
|
Temperature Power Law of Equilibrium Heavy Particle Density
|
12 pages, LATEX file with 6 PS figures
|
Phys.Rev. D61 (2000) 123508
|
10.1103/PhysRevD.61.123508
|
TU/99/577 and RCNS-99-05
|
hep-ph
| null |
A standard calculation of the energy density of heavy stable particles that
may pair-annihilate into light particles making up thermal medium is performed
to second order of coupling, using the technique of thermal field theory. At
very low temperatures a power law of temperature is derived for the energy
density of the heavy particle. This is in sharp contrast to the exponentially
suppressed contribution estimated from the ideal gas distribution function. The
result supports a previous dynamical calculation based on the Hartree
approximation, and implies that the relic abundance of dark matter particles is
enhanced compared to that based on the Boltzmann equation.
|
[
{
"created": "Tue, 19 Oct 1999 05:06:04 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Matsumoto",
"Sh.",
""
],
[
"Yoshimura",
"M.",
""
]
] |
A standard calculation of the energy density of heavy stable particles that may pair-annihilate into light particles making up thermal medium is performed to second order of coupling, using the technique of thermal field theory. At very low temperatures a power law of temperature is derived for the energy density of the heavy particle. This is in sharp contrast to the exponentially suppressed contribution estimated from the ideal gas distribution function. The result supports a previous dynamical calculation based on the Hartree approximation, and implies that the relic abundance of dark matter particles is enhanced compared to that based on the Boltzmann equation.
|
1902.04470
|
Michal Malinsk\'y
|
Mat\v{e}j Hudec, Michal Malinsk\'y
|
Hierarchy and decoupling
|
17 pages
| null |
10.1088/1361-6471/ab5138
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A large hierarchy between the electroweak scale and virtually any new scale
of beyond-Standard-Model physics is often claimed to be unnatural. Sometimes,
the apparent disparity between the measured Higgs mass and the size of the
typical loop corrections encountered within such schemes is even interpretted
as a profound indication that one should expect a remedy just behind the
corner, probably in form of a new physics such as low-scale supersymmetry, new
strong dynamics etc. In reality, all such potentially large corrections in the
one- and two-point Green's functions cancel with each other in the physical
Higgs mass $m_{H}$ which eventually turns out to be driven only by the
electroweak VEV $v$. This, naively, may look like a miracle, the more that the
standard perturbative approach often makes it irresistible to discuss the
magnitudes of those corrections as if, individually, they were physically
relevant. To shed some more light on this conundrum we advocate a method based
on the symmetry properties of the Coleman-Weinberg effective potential which
not only makes it very clear why $m_H\propto v$ to all orders in the
perturbative expansion but, at the same time, it does not require any
inspection of the explicit form of the tadpole equations whatsoever. Besides
simplifying the calculations considerably it makes the "internal composition"
of the VEV in terms of the high-scale parameters essentially irrelevant. We
exemplify these findings on an extended series of specific simplified models in
which the role of the heavy dynamics is played by all "reasonable" types of
fields (barring gravity), i.e., by a heavy scalar, a heavy (Majorana) fermion
and a heavy vector, respectively. We show that the dependence of $m_{H}$ on the
heavy scale follows the expectation based on dynamical arguments such as the
decoupling theorem.
|
[
{
"created": "Tue, 12 Feb 2019 16:17:46 GMT",
"version": "v1"
}
] |
2020-01-08
|
[
[
"Hudec",
"Matěj",
""
],
[
"Malinský",
"Michal",
""
]
] |
A large hierarchy between the electroweak scale and virtually any new scale of beyond-Standard-Model physics is often claimed to be unnatural. Sometimes, the apparent disparity between the measured Higgs mass and the size of the typical loop corrections encountered within such schemes is even interpretted as a profound indication that one should expect a remedy just behind the corner, probably in form of a new physics such as low-scale supersymmetry, new strong dynamics etc. In reality, all such potentially large corrections in the one- and two-point Green's functions cancel with each other in the physical Higgs mass $m_{H}$ which eventually turns out to be driven only by the electroweak VEV $v$. This, naively, may look like a miracle, the more that the standard perturbative approach often makes it irresistible to discuss the magnitudes of those corrections as if, individually, they were physically relevant. To shed some more light on this conundrum we advocate a method based on the symmetry properties of the Coleman-Weinberg effective potential which not only makes it very clear why $m_H\propto v$ to all orders in the perturbative expansion but, at the same time, it does not require any inspection of the explicit form of the tadpole equations whatsoever. Besides simplifying the calculations considerably it makes the "internal composition" of the VEV in terms of the high-scale parameters essentially irrelevant. We exemplify these findings on an extended series of specific simplified models in which the role of the heavy dynamics is played by all "reasonable" types of fields (barring gravity), i.e., by a heavy scalar, a heavy (Majorana) fermion and a heavy vector, respectively. We show that the dependence of $m_{H}$ on the heavy scale follows the expectation based on dynamical arguments such as the decoupling theorem.
|
2102.11151
|
Yen-Hsun Lin
|
Guey-Lin Lin and Yen-Hsun Lin
|
Exploring dark sector parameters in light of neutron star temperatures
|
27 pages, 10 figures, 1 table, accepted by PRD, matched the published
version
|
Phys. Rev. D 104, 063021 (2021)
|
10.1103/PhysRevD.104.063021
| null |
hep-ph astro-ph.HE
|
http://creativecommons.org/licenses/by/4.0/
|
Using neutron stars (NS) as a dark matter (DM) probe has gained broad
attention recently, either from heating due to DM annihilation or its stability
under the presence of DM. In this work, we investigate spin-$1/2$ fermionic DM
$\chi$ charged under the $U(1)_{X}$ in the dark sector. The massive gauge boson
$V$ of $U(1)_{X}$ gauge group can be produced in NS via DM annihilation. The
produced gauge boson can decay into Standard Model (SM) particles before it
exits the NS, despite its tiny couplings to SM particles. Thus, we perform a
systematic study on $\chi\bar{\chi}\to2V\to4{\rm SM}$ as a new heating
mechanism for NS in addition to $\chi\bar{\chi}\to2{\rm SM}$ and kinetic
heating from DM-baryon scattering. The self-trapping due to $\chi V$ scattering
is also considered. We assume the general framework that both kinetic and mass
mixing terms between $V$ and SM gauge bosons are present. This allows both
vector and axial-vector couplings between $V$ and SM fermions even for $m_V\ll
m_Z$. Notably, the contribution from axial-vector coupling is not negligible
when particles scatter relativistically. We point out that the above approaches
to DM-induced NS heating are not yet adopted in recent analyses.
Detectabilities of the aforementioned effects to the NS surface temperature by
the future telescopes are discussed as well.
|
[
{
"created": "Mon, 22 Feb 2021 16:19:06 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Aug 2021 16:15:01 GMT",
"version": "v2"
}
] |
2021-09-22
|
[
[
"Lin",
"Guey-Lin",
""
],
[
"Lin",
"Yen-Hsun",
""
]
] |
Using neutron stars (NS) as a dark matter (DM) probe has gained broad attention recently, either from heating due to DM annihilation or its stability under the presence of DM. In this work, we investigate spin-$1/2$ fermionic DM $\chi$ charged under the $U(1)_{X}$ in the dark sector. The massive gauge boson $V$ of $U(1)_{X}$ gauge group can be produced in NS via DM annihilation. The produced gauge boson can decay into Standard Model (SM) particles before it exits the NS, despite its tiny couplings to SM particles. Thus, we perform a systematic study on $\chi\bar{\chi}\to2V\to4{\rm SM}$ as a new heating mechanism for NS in addition to $\chi\bar{\chi}\to2{\rm SM}$ and kinetic heating from DM-baryon scattering. The self-trapping due to $\chi V$ scattering is also considered. We assume the general framework that both kinetic and mass mixing terms between $V$ and SM gauge bosons are present. This allows both vector and axial-vector couplings between $V$ and SM fermions even for $m_V\ll m_Z$. Notably, the contribution from axial-vector coupling is not negligible when particles scatter relativistically. We point out that the above approaches to DM-induced NS heating are not yet adopted in recent analyses. Detectabilities of the aforementioned effects to the NS surface temperature by the future telescopes are discussed as well.
|
2207.07943
|
Johannes Bl\"umlein
|
J. Bl\"umlein, P. Marquard, C. Schneider, and K. Sch\"onwald
|
The 3-loop anomalous dimensions from off-shell operator matrix elements
|
12 pages Latex, Contributeion to the Proceedings of LL2022
|
PoS (LL2022) 048
| null |
DESY 19--061, DO-TH 20/09, TTP22--048, RISC Report Series 22--09,
SAGEX 20--20
|
hep-ph hep-ex hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
We report on the calculation of the three-loop polarized and unpolarized
flavor non-singlet and the polarized singlet anomalous dimensions using
massless off-shell operator matrix elements in a gauge-variant framework. We
also reconsider the unpolarized two-loop singlet anomalous dimensions and
correct errors in the foregoing literature.
|
[
{
"created": "Sat, 16 Jul 2022 13:33:20 GMT",
"version": "v1"
}
] |
2022-07-19
|
[
[
"Blümlein",
"J.",
""
],
[
"Marquard",
"P.",
""
],
[
"Schneider",
"C.",
""
],
[
"Schönwald",
"K.",
""
]
] |
We report on the calculation of the three-loop polarized and unpolarized flavor non-singlet and the polarized singlet anomalous dimensions using massless off-shell operator matrix elements in a gauge-variant framework. We also reconsider the unpolarized two-loop singlet anomalous dimensions and correct errors in the foregoing literature.
|
1103.6252
|
Korinna Zapp
|
Korinna Christine Zapp, Johanna Stachel, Urs Achim Wiedemann
|
A local Monte Carlo framework for coherent QCD parton energy loss
|
49 pages, 13 figures, v2: typos corrected
| null |
10.1007/JHEP07(2011)118
|
IPPP/11/16, DCPT/11/32, MCnet-11-11, CERN-PH-TH/2011-043
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Monte Carlo (MC) simulations are the standard tool for describing jet-like
multi-particle final states. To apply them to the simulation of medium-modified
jets in heavy ion collisions, a probabilistic implementation of medium-induced
quantum interference effects is needed. Here, we analyze in detail how the
quantum interference effects included in the BDMPS-Z formalism of
medium-induced gluon radiation can be implemented in a quantitatively
controlled, local probabilistic parton cascade. The resulting MC algorithm is
formulated in terms of elastic and inelastic mean free paths, and it is by
construction insensitive to the IR and UV divergences of the total elastic and
inelastic cross sections that serve as its basic building blocks in the
incoherent limit. Interference effects are implemented by reweighting gluon
production histories as a function of the number of scattering centers that act
within the gluon formation time. Unlike existing implementations based on gluon
formation time, we find generic arguments for why a quantitative implementation
of quantum interference cannot amount to a mere dead-time requirement for
subsequent gluon production. We validate the proposed MC algorithm by comparing
MC simulations with parametric dependencies and analytical results of the
BDMPS-Z formalism. In particular, we show that the MC algorithm interpolates
correctly between analytically known limiting cases for totally coherent and
incoherent gluon production, and that it accounts quantitatively for the
medium-induced gluon energy distribution and the resulting average parton
energy loss. We also verify that the MC algorithm implements the transverse
momentum broadening of the BDMPS-Z formalism. We finally discuss why the
proposed MC algorithm provides a suitable starting point for going beyond the
approximations of the BDMPS-Z formalism.
|
[
{
"created": "Thu, 31 Mar 2011 17:46:17 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Aug 2011 14:45:40 GMT",
"version": "v2"
}
] |
2011-08-03
|
[
[
"Zapp",
"Korinna Christine",
""
],
[
"Stachel",
"Johanna",
""
],
[
"Wiedemann",
"Urs Achim",
""
]
] |
Monte Carlo (MC) simulations are the standard tool for describing jet-like multi-particle final states. To apply them to the simulation of medium-modified jets in heavy ion collisions, a probabilistic implementation of medium-induced quantum interference effects is needed. Here, we analyze in detail how the quantum interference effects included in the BDMPS-Z formalism of medium-induced gluon radiation can be implemented in a quantitatively controlled, local probabilistic parton cascade. The resulting MC algorithm is formulated in terms of elastic and inelastic mean free paths, and it is by construction insensitive to the IR and UV divergences of the total elastic and inelastic cross sections that serve as its basic building blocks in the incoherent limit. Interference effects are implemented by reweighting gluon production histories as a function of the number of scattering centers that act within the gluon formation time. Unlike existing implementations based on gluon formation time, we find generic arguments for why a quantitative implementation of quantum interference cannot amount to a mere dead-time requirement for subsequent gluon production. We validate the proposed MC algorithm by comparing MC simulations with parametric dependencies and analytical results of the BDMPS-Z formalism. In particular, we show that the MC algorithm interpolates correctly between analytically known limiting cases for totally coherent and incoherent gluon production, and that it accounts quantitatively for the medium-induced gluon energy distribution and the resulting average parton energy loss. We also verify that the MC algorithm implements the transverse momentum broadening of the BDMPS-Z formalism. We finally discuss why the proposed MC algorithm provides a suitable starting point for going beyond the approximations of the BDMPS-Z formalism.
|
1309.7085
|
Simonetta Liuti
|
Evan Askanazi, Katherine Holcomb and Simonetta Liuti
|
Self-Organizing Maps Parametrization of Deep Inelastic Structure
Functions with Error Determination
|
16 pages, 12 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present and discuss a new method to extract parton distribution functions
from hard scattering processes based on an alternative type of neural network,
the Self-Organizing Map. Quantitative results including a detailed treatment of
uncertainties are presented within a Next to Leading Order analysis of
inclusive electron proton deep inelastic scattering data.
|
[
{
"created": "Thu, 26 Sep 2013 22:54:08 GMT",
"version": "v1"
}
] |
2013-09-30
|
[
[
"Askanazi",
"Evan",
""
],
[
"Holcomb",
"Katherine",
""
],
[
"Liuti",
"Simonetta",
""
]
] |
We present and discuss a new method to extract parton distribution functions from hard scattering processes based on an alternative type of neural network, the Self-Organizing Map. Quantitative results including a detailed treatment of uncertainties are presented within a Next to Leading Order analysis of inclusive electron proton deep inelastic scattering data.
|
hep-ph/0407295
|
Wojciech Broniowski
|
Wojciech Broniowski, Enrique Ruiz Arriola
|
Kwiecinski evolution of unintegrated parton distributions
|
4 pages, 4 figures, talk presented by WB at DIS'2004, Strbske Pleso,
Slovakia
| null | null | null |
hep-ph
| null |
The Kwiecinski evolution of unintegrated parton distributions (UPDs) in the
transverse-coordinate space is analyzed with the help of the Mellin transform.
Numerical results are presented for the unintegrated pion distributions with a
simple valence-like initial condition at the low scale, which follows from
chiral large-Nc quark models. The effect of spreading of UPDs in the transverse
momentum with the increasing scale is confirmed, with <kT^2> growing
asymptotically as Q^2 alpha(Q^2). Formal aspects of the equations, such as the
limits of UPDs at x -> 0, x -> 1, and at low and large b, are straightforward
to obtain with our method.
|
[
{
"created": "Mon, 26 Jul 2004 13:44:17 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Broniowski",
"Wojciech",
""
],
[
"Arriola",
"Enrique Ruiz",
""
]
] |
The Kwiecinski evolution of unintegrated parton distributions (UPDs) in the transverse-coordinate space is analyzed with the help of the Mellin transform. Numerical results are presented for the unintegrated pion distributions with a simple valence-like initial condition at the low scale, which follows from chiral large-Nc quark models. The effect of spreading of UPDs in the transverse momentum with the increasing scale is confirmed, with <kT^2> growing asymptotically as Q^2 alpha(Q^2). Formal aspects of the equations, such as the limits of UPDs at x -> 0, x -> 1, and at low and large b, are straightforward to obtain with our method.
|
hep-ph/9807561
|
Bob Holdom
|
B. Holdom and T. Torma
|
New Axial Interactions at a TeV
|
14 pages, 1 figure, PRD version
|
Phys. Rev. D 59, 075005 (1999)
|
10.1103/PhysRevD.59.075005
|
UTPT-98-12
|
hep-ph
| null |
We consider a heavy fourth family with masses lying in the symmetry breaking
channel of a new strong gauge interaction. This interaction generates a heavy
quark axial-type operator, whose effects can be enhanced through multiple
insertions. In terms of the strength of this operator we can express new
negative contributions to the S and T parameters and the shifts of the Z
couplings to the third family. In particular we find that the new contribution
to T is strongly constrained by the experimental constraints on the Z coupling
to the tau.
|
[
{
"created": "Thu, 30 Jul 1998 20:10:37 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Jan 1999 15:21:21 GMT",
"version": "v2"
}
] |
2016-08-25
|
[
[
"Holdom",
"B.",
""
],
[
"Torma",
"T.",
""
]
] |
We consider a heavy fourth family with masses lying in the symmetry breaking channel of a new strong gauge interaction. This interaction generates a heavy quark axial-type operator, whose effects can be enhanced through multiple insertions. In terms of the strength of this operator we can express new negative contributions to the S and T parameters and the shifts of the Z couplings to the third family. In particular we find that the new contribution to T is strongly constrained by the experimental constraints on the Z coupling to the tau.
|
1309.7287
|
Philipp Kant
|
Philipp Kant
|
Finding Linear Dependencies in Integration-By-Parts Equations: A Monte
Carlo Approach
|
8 pages, 1 figure. Added references. Some minor additions
| null |
10.1016/j.cpc.2014.01.017
|
HU-EP-13/49, SFB/CPP-13-68
|
hep-ph cs.SC physics.comp-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The reduction of a large number of scalar integrals to a small set of master
integrals via Laporta's algorithm is common practice in multi-loop
calculations. It is also a major bottleneck in terms of running time and memory
consumption. It involves solving a large set of linear equations where many of
the equations are linearly dependent. We propose a simple algorithm that
eliminates all linearly dependent equations from a given system, reducing the
time and space requirements of a subsequent run of Laporta's algorithm.
|
[
{
"created": "Fri, 27 Sep 2013 16:23:42 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Feb 2014 14:59:01 GMT",
"version": "v2"
}
] |
2015-06-17
|
[
[
"Kant",
"Philipp",
""
]
] |
The reduction of a large number of scalar integrals to a small set of master integrals via Laporta's algorithm is common practice in multi-loop calculations. It is also a major bottleneck in terms of running time and memory consumption. It involves solving a large set of linear equations where many of the equations are linearly dependent. We propose a simple algorithm that eliminates all linearly dependent equations from a given system, reducing the time and space requirements of a subsequent run of Laporta's algorithm.
|
1005.3359
|
Xing-Gang Wu
|
Xing-Gang Wu and Tao Huang
|
An Implication on the Pion Distribution Amplitude from the Pion-Photon
Transition Form Factor with the New BABAR Data
|
19 pages, 6 figures, 2 tables. Slightly changed, references updated.
To be published in Phys.Rev. D
|
Phys.Rev.D82:034024,2010
|
10.1103/PhysRevD.82.034024
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The new BABAR data on the pion-photon transition form factor arouses people's
new interests on the determination of pion distribution amplitude. To explain
the data, we take both the leading valence quark state's and the non-valence
quark states' contributions into consideration, where the valence quark part up
to next-to-leading order is presented and the non-valence quark part is
estimated by a phenomenological model based on its limiting behavior at both
$Q^2\to 0$ and $Q^2\to\infty$. Our results show that to be consistent with the
new BABAR data at large $Q^2$ region, a broader other than the asymptotic-like
pion distribution amplitude should be adopted. The broadness of the pion
distribution amplitude is controlled by a parameter $B$. It has been found that
the new BABAR data at low and high energy regions can be explained
simultaneously by setting $B$ to be around 0.60, in which the pion distribution
amplitude is closed to the Chernyak-Zhitnitsky form.
|
[
{
"created": "Wed, 19 May 2010 04:33:09 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Jul 2010 00:07:39 GMT",
"version": "v2"
}
] |
2015-03-17
|
[
[
"Wu",
"Xing-Gang",
""
],
[
"Huang",
"Tao",
""
]
] |
The new BABAR data on the pion-photon transition form factor arouses people's new interests on the determination of pion distribution amplitude. To explain the data, we take both the leading valence quark state's and the non-valence quark states' contributions into consideration, where the valence quark part up to next-to-leading order is presented and the non-valence quark part is estimated by a phenomenological model based on its limiting behavior at both $Q^2\to 0$ and $Q^2\to\infty$. Our results show that to be consistent with the new BABAR data at large $Q^2$ region, a broader other than the asymptotic-like pion distribution amplitude should be adopted. The broadness of the pion distribution amplitude is controlled by a parameter $B$. It has been found that the new BABAR data at low and high energy regions can be explained simultaneously by setting $B$ to be around 0.60, in which the pion distribution amplitude is closed to the Chernyak-Zhitnitsky form.
|
0910.4947
|
Shu Lin
|
Shu Lin and Edward Shuryak
|
The Rise and Fall of Baryons
|
13 pages, 13 figures, minor changes to the text
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss the baryonic contribution to QCD thermodynamics near the QCD phase
transition, which we split into "stringy excitations" and the "chiral" lowest
states. Our finite-$T$ string model for the former component is inspired by the
lattice data on static potentials and ideas of string survival even $above$
$T_c$: it is used to explain two sets of baryonic susceptibilities calculated
on the lattice by the Bielefeld-BNL group. Two new ingredients of the model are
(i) the near-$T_c$ tightening of the strings, and (ii) physical upper limit of
the string length. Then we proceed to more subtle effects related to chiral
restoration dynamics near $T_c$: we suggest that "melting" of the sigma terms
of the lowest nucleon/$\Delta$ masses can explain these susceptibilities. In a
discussion, we consider bound monopole-quark states, as a possible explanation
to some deficits of contribution at $T=(1-1.4)T_c$.
|
[
{
"created": "Mon, 26 Oct 2009 18:21:15 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Jan 2010 20:15:45 GMT",
"version": "v2"
}
] |
2010-01-14
|
[
[
"Lin",
"Shu",
""
],
[
"Shuryak",
"Edward",
""
]
] |
We discuss the baryonic contribution to QCD thermodynamics near the QCD phase transition, which we split into "stringy excitations" and the "chiral" lowest states. Our finite-$T$ string model for the former component is inspired by the lattice data on static potentials and ideas of string survival even $above$ $T_c$: it is used to explain two sets of baryonic susceptibilities calculated on the lattice by the Bielefeld-BNL group. Two new ingredients of the model are (i) the near-$T_c$ tightening of the strings, and (ii) physical upper limit of the string length. Then we proceed to more subtle effects related to chiral restoration dynamics near $T_c$: we suggest that "melting" of the sigma terms of the lowest nucleon/$\Delta$ masses can explain these susceptibilities. In a discussion, we consider bound monopole-quark states, as a possible explanation to some deficits of contribution at $T=(1-1.4)T_c$.
|
hep-ph/9705327
|
Svjetlana Fajfer, Ijs
|
S. Fajfer, P. Singer
|
Long distance $c \to u \gamma$ effects in weak radiative decays of
D-mesons
|
28 pages, Latex, 2 Figures
|
Phys.Rev.D56:4302-4310,1997
|
10.1103/PhysRevD.56.4302
|
TECHNION-PH-97-05; IJS-TP-97/07
|
hep-ph
| null |
We present a detailed analysis of the $D \to V \gamma $ transitions, using a
model which combines heavy quark effective theory and the chiral Lagrangian
approach and includes symmetry breaking. We notice that in addition to the
previously considered s - channel annihilation and t - channel W - exchange,
there is a long distance penguin - like $ c \to u \gamma$ contribution in the t
- channel of Cabibbo - suppressed modes. Its magnitude is determined by the
size of symmetry breaking which we calculate with a vector dominance approach.
Although smaller in magnitude, the penguin - like contribution would lead to
sizeable effects in case of cancellations among the other contributions to the
amplitude. Thus, it may invalidate suggested tests for beyond the standard
model effects in these decays. We also indicate the range of expectations for
the branching ratios of various $D \to V \gamma$ modes.
|
[
{
"created": "Thu, 15 May 1997 17:23:46 GMT",
"version": "v1"
}
] |
2011-02-01
|
[
[
"Fajfer",
"S.",
""
],
[
"Singer",
"P.",
""
]
] |
We present a detailed analysis of the $D \to V \gamma $ transitions, using a model which combines heavy quark effective theory and the chiral Lagrangian approach and includes symmetry breaking. We notice that in addition to the previously considered s - channel annihilation and t - channel W - exchange, there is a long distance penguin - like $ c \to u \gamma$ contribution in the t - channel of Cabibbo - suppressed modes. Its magnitude is determined by the size of symmetry breaking which we calculate with a vector dominance approach. Although smaller in magnitude, the penguin - like contribution would lead to sizeable effects in case of cancellations among the other contributions to the amplitude. Thus, it may invalidate suggested tests for beyond the standard model effects in these decays. We also indicate the range of expectations for the branching ratios of various $D \to V \gamma$ modes.
|
hep-ph/9305322
|
Steven Bass
|
S.D. Bass (Cavendish Lab., Cambridge, U.K.) and A. W. Thomas (Univ.
Adelaide, Australia)
|
Mapping the x dependence of the axial anomaly in polarised deep
inelastic scattering
|
11pages Latex, 6 Figs. appended as .ps files after main text,
Cavendish preprint HEP-93/1
|
Phys.Lett.B312:345-350,1993
|
10.1016/0370-2693(93)91091-Z
| null |
hep-ph
| null |
We discuss the role of the U(1) axial anomaly in the spin structure functions
of the nucleon, with particular emphasis on how one might determine its x
dependence in present and future deep inelastic scattering experiments. We
focus on the C-odd spin structure function g3 and also the deuteron structure
function g1^d.
|
[
{
"created": "Wed, 26 May 1993 14:59:10 GMT",
"version": "v1"
}
] |
2010-02-17
|
[
[
"Bass",
"S. D.",
"",
"Cavendish Lab., Cambridge, U.K."
],
[
"Thomas",
"A. W.",
"",
"Univ.\n Adelaide, Australia"
]
] |
We discuss the role of the U(1) axial anomaly in the spin structure functions of the nucleon, with particular emphasis on how one might determine its x dependence in present and future deep inelastic scattering experiments. We focus on the C-odd spin structure function g3 and also the deuteron structure function g1^d.
|
hep-ph/0401166
|
Alexander Silenko
|
Alexander J. Silenko
|
Equation of spin motion in storage rings in a cylindrical coordinate
system
|
14 pages
|
Published in Phys.Rev. ST Accel. Beams 9:034003,2006
|
10.1103/PhysRevSTAB.9.034003
| null |
hep-ph
| null |
The exact equation of spin motion in a cylindrical coordinate system with
allowance for electric dipole moments of particles has been derived. This
equation is convenient for analytical calculations of spin dynamics in circular
storage rings when the configuration of main fields is simple enough. The
generalized formula for the influence of a vertical betatron oscillation on the
angular velocity of spin rotation has been found. This formula agrees with the
previously obtained result and contains an additional oscillatory term that can
be used for fitting. The relative importance of terms in the equation of spin
motion is discussed.
|
[
{
"created": "Thu, 22 Jan 2004 16:25:47 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Mar 2006 10:48:05 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Silenko",
"Alexander J.",
""
]
] |
The exact equation of spin motion in a cylindrical coordinate system with allowance for electric dipole moments of particles has been derived. This equation is convenient for analytical calculations of spin dynamics in circular storage rings when the configuration of main fields is simple enough. The generalized formula for the influence of a vertical betatron oscillation on the angular velocity of spin rotation has been found. This formula agrees with the previously obtained result and contains an additional oscillatory term that can be used for fitting. The relative importance of terms in the equation of spin motion is discussed.
|
1103.4320
|
Christoffer Flensburg
|
Christoffer Flensburg, G\"osta Gustafson, Leif L\"onnblad and Andras
Ster
|
Correlations in double parton distributions at small x
|
19 pages v2: minor clarifications added. v3: citation added; JHEP
2011, Number 6, 66
| null |
10.1007/JHEP06(2011)066
|
LU-TP 11-12, CERN-PH-TH-2011-059, MCnet-11-09
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a dynamical study of the double parton distribution in impact
parameter space, which enters into the double scattering cross section in
hadronic collisions. This distribution is analogous to the generalized parton
densities in momentum space. We use the Lund Dipole Cascade model, presented in
earlier articles, which is based on BFKL evolution including essential higher
order corrections and saturation effects. As result we find large correlation
effects, which break the factorization of the double scattering process. At
small transverse separation we see the development of "hot spots", which become
stronger with increasing Q^2. At smaller x-values the distribution widens,
consistent with the shrinking of the diffractive peak in elastic scattering.
The dependence on Q^2 is, however, significantly stronger than the dependence
on x, which has implications for extrapolations to LHC, e.g. for results for
underlying events associated with the production of new heavy particles.
|
[
{
"created": "Tue, 22 Mar 2011 17:31:18 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Jun 2011 11:33:34 GMT",
"version": "v2"
},
{
"created": "Mon, 27 Jun 2011 10:08:40 GMT",
"version": "v3"
}
] |
2011-06-28
|
[
[
"Flensburg",
"Christoffer",
""
],
[
"Gustafson",
"Gösta",
""
],
[
"Lönnblad",
"Leif",
""
],
[
"Ster",
"Andras",
""
]
] |
We present a dynamical study of the double parton distribution in impact parameter space, which enters into the double scattering cross section in hadronic collisions. This distribution is analogous to the generalized parton densities in momentum space. We use the Lund Dipole Cascade model, presented in earlier articles, which is based on BFKL evolution including essential higher order corrections and saturation effects. As result we find large correlation effects, which break the factorization of the double scattering process. At small transverse separation we see the development of "hot spots", which become stronger with increasing Q^2. At smaller x-values the distribution widens, consistent with the shrinking of the diffractive peak in elastic scattering. The dependence on Q^2 is, however, significantly stronger than the dependence on x, which has implications for extrapolations to LHC, e.g. for results for underlying events associated with the production of new heavy particles.
|
1401.4801
|
Stefan Groote Dr.
|
S. Groote, J.G. K\"orner and D. Niinepuu
|
Perturbative $O(\alpha_s)$ corrections to the correlation functions of
light tetraquark currents
|
31 pages, 2 figures and 2 tables
|
Phys. Rev. D 90, 054028 (2014)
|
10.1103/PhysRevD.90.054028
|
MITP/14-003
|
hep-ph hep-lat
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We calculate the next-to-leading order QCD corrections to the perturbative
term in the operator product expansion of the spectral functions of light
tetraquark currents. By using also configuration space methods we keep the
momentum space four-loop calculation to a manageable level. We find that the
next-to-leading order corrections to the perturbative term are large and can
amount to $O(100\%)$. The corrections to the corresponding Borel sum rules,
however, are small since the nonperturbative condensate contributions dominate
the Borel sum rules.
|
[
{
"created": "Mon, 20 Jan 2014 06:38:30 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Sep 2014 06:06:58 GMT",
"version": "v2"
}
] |
2014-10-01
|
[
[
"Groote",
"S.",
""
],
[
"Körner",
"J. G.",
""
],
[
"Niinepuu",
"D.",
""
]
] |
We calculate the next-to-leading order QCD corrections to the perturbative term in the operator product expansion of the spectral functions of light tetraquark currents. By using also configuration space methods we keep the momentum space four-loop calculation to a manageable level. We find that the next-to-leading order corrections to the perturbative term are large and can amount to $O(100\%)$. The corrections to the corresponding Borel sum rules, however, are small since the nonperturbative condensate contributions dominate the Borel sum rules.
|
0807.4380
|
Stefano Nicotri
|
Stefano Nicotri
|
$D_{sJ}(2700)$ and other puzzling states in charm spectroscopy
|
LaTeX, 3 pages. Talk given at IFAE 2008, Bologna, Italy, 26-28 March
2008
| null |
10.1393/ncb/i2008-10579-5
|
BA-TH/595-08
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
I briefly introduce the status of charm physics and I discuss the case of the
meson with open charm $D_{sJ}(2700)$.
|
[
{
"created": "Mon, 28 Jul 2008 08:48:23 GMT",
"version": "v1"
}
] |
2009-11-13
|
[
[
"Nicotri",
"Stefano",
""
]
] |
I briefly introduce the status of charm physics and I discuss the case of the meson with open charm $D_{sJ}(2700)$.
|
hep-ph/9603449
| null |
Elizabeth Jenkins
|
Heavy Baryon Masses in the $1/m_Q$ and $1/N_c$ Expansions
|
21 pages, REVtex, version to appear Phys. Rev. D
|
Phys.Rev.D54:4515-4531,1996
|
10.1103/PhysRevD.54.4515
|
UCSD/PTH 96-08
|
hep-ph
| null |
The masses of baryons containing a single heavy quark are studied in a
combined expansion in $1/m_Q$, $1/N_c$ and $SU(3)$ flavor symmetry breaking.
Heavy quark baryon mass splittings are related to mass splittings of the octet
and decuplet baryons. The $\Sigma_c^*$, $\Xi_c^\prime$ and $\Omega_c^*$ are
predicted to the level of a few MeV. A number of bottom baryon mass splittings
are predicted very accurately.
|
[
{
"created": "Mon, 1 Apr 1996 01:31:14 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Sep 1996 23:04:06 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Jenkins",
"Elizabeth",
""
]
] |
The masses of baryons containing a single heavy quark are studied in a combined expansion in $1/m_Q$, $1/N_c$ and $SU(3)$ flavor symmetry breaking. Heavy quark baryon mass splittings are related to mass splittings of the octet and decuplet baryons. The $\Sigma_c^*$, $\Xi_c^\prime$ and $\Omega_c^*$ are predicted to the level of a few MeV. A number of bottom baryon mass splittings are predicted very accurately.
|
1211.4573
|
Miguel Pato
|
Mathias Garny, Alejandro Ibarra, Miguel Pato, Stefan Vogl
|
On the spin-dependent sensitivity of XENON100
|
7 pages, 3 figures
|
Phys. Rev. D 87, 056002 (2013)
|
10.1103/PhysRevD.87.056002
| null |
hep-ph astro-ph.CO hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The latest XENON100 data severely constrains dark matter elastic scattering
off nuclei, leading to impressive upper limits on the spin-independent
cross-section. The main goal of this paper is to stress that the same data set
has also an excellent \emph{spin-dependent} sensitivity, which is of utmost
importance in probing dark matter models. We show in particular that the
constraints set by XENON100 on the spin-dependent neutron cross-section are by
far the best at present, whereas the corresponding spin-dependent proton limits
lag behind other direct detection results. The effect of nuclear uncertainties
on the structure functions of xenon isotopes is analysed in detail and found to
lessen the robustness of the constraints, especially for spin-dependent proton
couplings. Notwithstanding, the spin-dependent neutron prospects for XENON1T
and DARWIN are very encouraging. We apply our constraints to well-motivated
dark matter models and demonstrate that in both mass-degenerate scenarios and
the minimal supersymmetric standard model the spin-dependent neutron limits can
actually override the spin-independent limits. This opens the possibility of
probing additional unexplored regions of the dark matter parameter space with
the next generation of ton-scale direct detection experiments.
|
[
{
"created": "Mon, 19 Nov 2012 21:00:01 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Mar 2013 11:56:45 GMT",
"version": "v2"
}
] |
2013-03-13
|
[
[
"Garny",
"Mathias",
""
],
[
"Ibarra",
"Alejandro",
""
],
[
"Pato",
"Miguel",
""
],
[
"Vogl",
"Stefan",
""
]
] |
The latest XENON100 data severely constrains dark matter elastic scattering off nuclei, leading to impressive upper limits on the spin-independent cross-section. The main goal of this paper is to stress that the same data set has also an excellent \emph{spin-dependent} sensitivity, which is of utmost importance in probing dark matter models. We show in particular that the constraints set by XENON100 on the spin-dependent neutron cross-section are by far the best at present, whereas the corresponding spin-dependent proton limits lag behind other direct detection results. The effect of nuclear uncertainties on the structure functions of xenon isotopes is analysed in detail and found to lessen the robustness of the constraints, especially for spin-dependent proton couplings. Notwithstanding, the spin-dependent neutron prospects for XENON1T and DARWIN are very encouraging. We apply our constraints to well-motivated dark matter models and demonstrate that in both mass-degenerate scenarios and the minimal supersymmetric standard model the spin-dependent neutron limits can actually override the spin-independent limits. This opens the possibility of probing additional unexplored regions of the dark matter parameter space with the next generation of ton-scale direct detection experiments.
|
hep-ph/0608276
|
Christoph Schuck
|
M. Gl\"uck, E. Reya
|
Parton evolution in the fixed flavor factorization scheme
|
5 pages
|
Mod.Phys.Lett.A22:351-354,2007
|
10.1142/S021773230702275X
| null |
hep-ph
| null |
It is argued that while the scale dependence of the parton distributions in
the fixed flavor factorization scheme is governed by three active flavors, the
scale dependence of the running coupling should nevertheless be better governed
by a variable number of active flavors.
|
[
{
"created": "Thu, 24 Aug 2006 14:15:13 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Glück",
"M.",
""
],
[
"Reya",
"E.",
""
]
] |
It is argued that while the scale dependence of the parton distributions in the fixed flavor factorization scheme is governed by three active flavors, the scale dependence of the running coupling should nevertheless be better governed by a variable number of active flavors.
|
hep-ph/9811432
|
Alexander S. Sakharov
|
M. Yu. Khlopov, A. S. Sakharov and A. L. Sudarikov
|
CosmoParticle Physics: Basic Principles and Prospects for Future
Development
|
12 pages
|
Grav.Cosmol.4:S1,1998
| null | null |
hep-ph
| null |
COSMOPARTICLE PHYSICS is the specific crossdisciplinary field of science,
studying foundations of particle physics and cosmology in the combination of
indirect cosmological, astrophysical and physical signatures of their
fundamental relationship. The possibilities to elaborate unique theoretical
grounds for cosmology and particle physics and to study quantitative
relationships between cosmological and laboratory effects follow from the basic
principles of cosmoparticle physics and open new interesting fields of
scientific research in its future development.
|
[
{
"created": "Sat, 21 Nov 1998 22:38:58 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Khlopov",
"M. Yu.",
""
],
[
"Sakharov",
"A. S.",
""
],
[
"Sudarikov",
"A. L.",
""
]
] |
COSMOPARTICLE PHYSICS is the specific crossdisciplinary field of science, studying foundations of particle physics and cosmology in the combination of indirect cosmological, astrophysical and physical signatures of their fundamental relationship. The possibilities to elaborate unique theoretical grounds for cosmology and particle physics and to study quantitative relationships between cosmological and laboratory effects follow from the basic principles of cosmoparticle physics and open new interesting fields of scientific research in its future development.
|
hep-ph/0209123
|
Naotoshi Okamura
|
N. Okamura (Virginia Tech)
|
Measuring the CP-Violating Phase by a Long Baseline Neutrino Experiment
with Hyper-Kamiokande
|
1 page, proccdings of Neutrino 2002, Munich, Germany, May 25-30,
2002, and YITP workshop, Kyoto, Japan, July 8-11. 2002
| null |
10.1016/S0920-5632(03)01365-3
|
VPI-IPPAP-02-10
|
hep-ph
| null |
This is a contribution paper of the XXth International Conference on Neutrino
Physics and Astrophysics (Neutrino2002) and YITP workshop.
|
[
{
"created": "Wed, 11 Sep 2002 19:48:25 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Okamura",
"N.",
"",
"Virginia Tech"
]
] |
This is a contribution paper of the XXth International Conference on Neutrino Physics and Astrophysics (Neutrino2002) and YITP workshop.
|
1101.0867
|
Fuminobu Takahashi
|
Fuminobu Takahashi and Tsutomu T. Yanagida
|
Why have supersymmetric particles not been observed?
|
9 pages. v2: Note added to clarify how the lower bound on the SUSY
mass scale is obtained
|
Physics Letters B 698 (2011) 408-410
|
10.1016/j.physletb.2011.03.032
|
IPMU-11-0001
|
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
If low-energy supersymmetry is the solution to the hierarchy problem, it is a
puzzle why supersymmetric particles have not been observed experimentally to
date. We show that supersymmetric particles in the TeV region can be explained
if the fundamental cut-off scale of the theory is smaller than the
4-dimensional Planck scale and if thermal leptogenesis is the source of the
observed baryon asymmetry. The supersymmetric particles such as sfermions and
gauginos are predicted to be in the TeV region, while the gravitino is the LSP
with mass of O(100)GeV and is a good candidate for dark matter. Interestingly,
the cosmological moduli problem can be solved in the theory with the low
cut-off scale.
|
[
{
"created": "Wed, 5 Jan 2011 02:07:29 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Feb 2011 09:05:41 GMT",
"version": "v2"
}
] |
2011-04-18
|
[
[
"Takahashi",
"Fuminobu",
""
],
[
"Yanagida",
"Tsutomu T.",
""
]
] |
If low-energy supersymmetry is the solution to the hierarchy problem, it is a puzzle why supersymmetric particles have not been observed experimentally to date. We show that supersymmetric particles in the TeV region can be explained if the fundamental cut-off scale of the theory is smaller than the 4-dimensional Planck scale and if thermal leptogenesis is the source of the observed baryon asymmetry. The supersymmetric particles such as sfermions and gauginos are predicted to be in the TeV region, while the gravitino is the LSP with mass of O(100)GeV and is a good candidate for dark matter. Interestingly, the cosmological moduli problem can be solved in the theory with the low cut-off scale.
|
2307.07844
|
Mayank Singh
|
Charles Gale, Sangyong Jeon, Daniel Pablos, Mayank Singh
|
Studying QGP transport properties in a concurrent minijet+hydro
framework
|
6 pages, 4 figures, Proceedings for Hard Probes 2023
| null | null | null |
hep-ph nucl-th
|
http://creativecommons.org/licenses/by/4.0/
|
Minijets are ubiquitous in heavy-ion collision experiments. However, they are
often excluded from the hydrodynamic simulations of QGP as they do not
thermalize at short time scales and are not treated as part of the collective
medium. Using a concurrent jet+hydro framework, we show that the minijets could
account for a significant portion of particle multiplicity. Therefore, the
energy deposition from minijet-medium interactions can substantially modify the
QGP transport properties inferred from model-to-data comparisons.
|
[
{
"created": "Sat, 15 Jul 2023 16:33:36 GMT",
"version": "v1"
}
] |
2023-07-18
|
[
[
"Gale",
"Charles",
""
],
[
"Jeon",
"Sangyong",
""
],
[
"Pablos",
"Daniel",
""
],
[
"Singh",
"Mayank",
""
]
] |
Minijets are ubiquitous in heavy-ion collision experiments. However, they are often excluded from the hydrodynamic simulations of QGP as they do not thermalize at short time scales and are not treated as part of the collective medium. Using a concurrent jet+hydro framework, we show that the minijets could account for a significant portion of particle multiplicity. Therefore, the energy deposition from minijet-medium interactions can substantially modify the QGP transport properties inferred from model-to-data comparisons.
|
hep-ph/0012288
|
Dmitri Kazakov
|
D. I. Kazakov (JINR, Dubna and ITEP, Moscow)
|
Beyond the Standard Model (In Search of Supersymmetry)
|
LaTeX2e, 80 pages, 60 eps figures, v2 references corrected Lectures
given at the European School for High Energy Physics, Caramulo, Portugal,
Aug.-Sept. 2000
| null | null | null |
hep-ph
| null |
The present lectures contain an introduction to low energy supersymmetry, a
new symmetry that relates bosons and fermions, in particle physics. The
Standard Model of fundamental interactions is briefly reviewed, and the
motivation to introduce supersymmetry is discussed. The main notions of
supersymmetry are introduced. The supersymmetric extension of the Standard
Model - the Minimal Supersymmetric Standard Model - is considered in more
detail. Phenomenological features of the MSSM as well as possible experimental
signatures of SUSY are described. An intriguing situation with the
supersymmetric Higgs boson is discussed.
|
[
{
"created": "Thu, 21 Dec 2000 14:15:15 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Jan 2001 16:11:08 GMT",
"version": "v2"
}
] |
2009-09-25
|
[
[
"Kazakov",
"D. I.",
"",
"JINR, Dubna and ITEP, Moscow"
]
] |
The present lectures contain an introduction to low energy supersymmetry, a new symmetry that relates bosons and fermions, in particle physics. The Standard Model of fundamental interactions is briefly reviewed, and the motivation to introduce supersymmetry is discussed. The main notions of supersymmetry are introduced. The supersymmetric extension of the Standard Model - the Minimal Supersymmetric Standard Model - is considered in more detail. Phenomenological features of the MSSM as well as possible experimental signatures of SUSY are described. An intriguing situation with the supersymmetric Higgs boson is discussed.
|
0901.2609
|
Seodong Shin
|
Yeong Gyun Kim and Seodong Shin
|
Singlet Fermionic Dark Matter explains DAMA signal
|
9 pages, 3 figures
|
JHEP 0905:036,2009
|
10.1088/1126-6708/2009/05/036
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
It has been suggested that, considering channeling effect, the order of a few
GeV dark matters which are elastically scattered from detector nuclei might be
plausible candidates reconciling the DAMA annual modulation signal with the
results of other null experiments. We show that Singlet Fermionic Dark Matter
can be such a dark matter candidate, simultaneously providing the correct
thermal relic density which is consistent with the WMAP data.
|
[
{
"created": "Sat, 17 Jan 2009 03:59:12 GMT",
"version": "v1"
}
] |
2010-01-15
|
[
[
"Kim",
"Yeong Gyun",
""
],
[
"Shin",
"Seodong",
""
]
] |
It has been suggested that, considering channeling effect, the order of a few GeV dark matters which are elastically scattered from detector nuclei might be plausible candidates reconciling the DAMA annual modulation signal with the results of other null experiments. We show that Singlet Fermionic Dark Matter can be such a dark matter candidate, simultaneously providing the correct thermal relic density which is consistent with the WMAP data.
|
hep-ph/9607459
|
Thomas Waas
|
N. Kaiser, T. Waas and W. Weise
|
SU(3) Chiral Dynamics with Coupled Channels: Eta and Kaon
Photoproduction
|
27 pages, TeX type, 21 figures in ps, submitted to Nucl. Phys. A
|
Nucl.Phys. A612 (1997) 297-320
|
10.1016/S0375-9474(96)00321-1
| null |
hep-ph
| null |
We identify the leading s-wave amplitudes of the SU(3) chiral meson-baryon
Lagrangian with an effective coupled-channel potential which is iterated in a
Lippmann-Schwinger equation. The strangeness $S=-1$ resonance $\Lambda(1405)$
and the $S_{11}(1535)$ nucleon resonance emerge as quasi-bound states of
anti-kaon/nucleon and kaon/$\Sigma$-hyperon. Our approach to meson
photoproduction introduces no new parameters. By adjusting a few finite range
parameters we are able to simultaneously describe a large amount of low energy
data. These include the cross sections of $K^-p$ elastic and inelastic
scattering, the cross sections of eta meson and kaon photoproduction from
nucleons as well as those of pion induced production of etas and kaons (16
different reaction channels altogether).
|
[
{
"created": "Mon, 29 Jul 1996 13:11:42 GMT",
"version": "v1"
}
] |
2016-09-06
|
[
[
"Kaiser",
"N.",
""
],
[
"Waas",
"T.",
""
],
[
"Weise",
"W.",
""
]
] |
We identify the leading s-wave amplitudes of the SU(3) chiral meson-baryon Lagrangian with an effective coupled-channel potential which is iterated in a Lippmann-Schwinger equation. The strangeness $S=-1$ resonance $\Lambda(1405)$ and the $S_{11}(1535)$ nucleon resonance emerge as quasi-bound states of anti-kaon/nucleon and kaon/$\Sigma$-hyperon. Our approach to meson photoproduction introduces no new parameters. By adjusting a few finite range parameters we are able to simultaneously describe a large amount of low energy data. These include the cross sections of $K^-p$ elastic and inelastic scattering, the cross sections of eta meson and kaon photoproduction from nucleons as well as those of pion induced production of etas and kaons (16 different reaction channels altogether).
|
1611.09856
|
Krzysztof Rolbiecki
|
Daniel Dercks, Nishita Desai, Jong Soo Kim, Krzysztof Rolbiecki, Jamie
Tattersall, Torsten Weber
|
CheckMATE 2: From the model to the limit
|
53 pages, 6 figures; references updated, instructions slightly
changed
| null |
10.1016/j.cpc.2017.08.021
|
CTPU-16-36, CSIC-16-116, TTK-16-47
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present the latest developments to the CheckMATE program that allows
models of new physics to be easily tested against the recent LHC data. To
achieve this goal, the core of CheckMATE now contains over 60 LHC analyses of
which 12 are from the 13 TeV run. The main new feature is that CheckMATE 2 now
integrates the Monte Carlo event generation via Madgraph and Pythia 8. This
allows users to go directly from a SLHA file or UFO model to the result of
whether a model is allowed or not. In addition, the integration of the event
generation leads to a significant increase in the speed of the program. Many
other improvements have also been made, including the possibility to now
combine signal regions to give a total likelihood for a model.
|
[
{
"created": "Tue, 29 Nov 2016 21:00:01 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Feb 2017 18:53:21 GMT",
"version": "v2"
}
] |
2017-10-25
|
[
[
"Dercks",
"Daniel",
""
],
[
"Desai",
"Nishita",
""
],
[
"Kim",
"Jong Soo",
""
],
[
"Rolbiecki",
"Krzysztof",
""
],
[
"Tattersall",
"Jamie",
""
],
[
"Weber",
"Torsten",
""
]
] |
We present the latest developments to the CheckMATE program that allows models of new physics to be easily tested against the recent LHC data. To achieve this goal, the core of CheckMATE now contains over 60 LHC analyses of which 12 are from the 13 TeV run. The main new feature is that CheckMATE 2 now integrates the Monte Carlo event generation via Madgraph and Pythia 8. This allows users to go directly from a SLHA file or UFO model to the result of whether a model is allowed or not. In addition, the integration of the event generation leads to a significant increase in the speed of the program. Many other improvements have also been made, including the possibility to now combine signal regions to give a total likelihood for a model.
|
2310.19883
|
Julie Pag\`es
|
Elizabeth E. Jenkins, Aneesh V. Manohar, Luca Naterop, Julie Pag\`es
|
Two Loop Renormalization of Scalar Theories using a Geometric Approach
|
ChPT results to O($p^6$) now agree with Bijnens, Colangelo, and
Ecker, hep-ph/9907333
| null | null |
ZU-TH 69/23, PSI-PR-23-39
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We derive a general formula for two-loop counterterms in Effective Field
Theories (EFTs) using a geometric approach. This formula allows the two-loop
results of our previous paper to be applied to a wide range of theories. The
two-loop results hold for loop graphs in EFTs where the interaction vertices
contain operators of arbitrarily high dimension, but at most two derivatives.
We also extend our previous one-loop result to include operators with an
arbitrary number of derivatives, as long as there is at most one derivative
acting on each field. The final result for the two-loop counterterms is written
in terms of geometric quantities such as the Riemann curvature tensor of the
scalar manifold and its covariant derivatives. As applications of our results,
we give the two-loop counterterms and renormalization group equations for the
O(n) EFT to dimension six, the scalar sector of the Standard Model Effective
Field Theory (SMEFT) to dimension six, and chiral perturbation theory to order
$p^6$.
|
[
{
"created": "Mon, 30 Oct 2023 18:00:04 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Nov 2023 19:25:02 GMT",
"version": "v2"
}
] |
2023-11-13
|
[
[
"Jenkins",
"Elizabeth E.",
""
],
[
"Manohar",
"Aneesh V.",
""
],
[
"Naterop",
"Luca",
""
],
[
"Pagès",
"Julie",
""
]
] |
We derive a general formula for two-loop counterterms in Effective Field Theories (EFTs) using a geometric approach. This formula allows the two-loop results of our previous paper to be applied to a wide range of theories. The two-loop results hold for loop graphs in EFTs where the interaction vertices contain operators of arbitrarily high dimension, but at most two derivatives. We also extend our previous one-loop result to include operators with an arbitrary number of derivatives, as long as there is at most one derivative acting on each field. The final result for the two-loop counterterms is written in terms of geometric quantities such as the Riemann curvature tensor of the scalar manifold and its covariant derivatives. As applications of our results, we give the two-loop counterterms and renormalization group equations for the O(n) EFT to dimension six, the scalar sector of the Standard Model Effective Field Theory (SMEFT) to dimension six, and chiral perturbation theory to order $p^6$.
|
1904.07915
|
Tongyan Lin
|
Tongyan Lin
|
TASI lectures on dark matter models and direct detection
|
90 pages
| null | null | null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
These lectures provide an introduction to models and direct detection of dark
matter. We summarize the general features and motivations for candidates in the
full dark matter mass range, and then restrict to the keV-TeV mass window.
Candidates in this window can be produced by thermal mechanisms in the standard
cosmology, and are an important target for experimental searches. We then turn
to sub-GeV dark matter (light dark matter) and dark sectors, an area where many
new models and experiments are currently being proposed. We discuss the
cosmology of dark sectors, specific portal realizations, and some of the
prospects for detection. The final parts of these lectures focus on the theory
for direct detection, both reviewing the fundamentals for nuclear recoils of
WIMPs and describing new directions for sub-GeV candidates. A version of these
lectures was originally presented at the TASI 2018 summer school on "Theory in
an Era of Data".
|
[
{
"created": "Tue, 16 Apr 2019 18:44:58 GMT",
"version": "v1"
}
] |
2019-04-18
|
[
[
"Lin",
"Tongyan",
""
]
] |
These lectures provide an introduction to models and direct detection of dark matter. We summarize the general features and motivations for candidates in the full dark matter mass range, and then restrict to the keV-TeV mass window. Candidates in this window can be produced by thermal mechanisms in the standard cosmology, and are an important target for experimental searches. We then turn to sub-GeV dark matter (light dark matter) and dark sectors, an area where many new models and experiments are currently being proposed. We discuss the cosmology of dark sectors, specific portal realizations, and some of the prospects for detection. The final parts of these lectures focus on the theory for direct detection, both reviewing the fundamentals for nuclear recoils of WIMPs and describing new directions for sub-GeV candidates. A version of these lectures was originally presented at the TASI 2018 summer school on "Theory in an Era of Data".
|
0709.3816
|
Jurgen Reuter
|
Jurgen Reuter
|
Little Higgs Model Discrimination at the LHC and ILC
|
Submitted for the SUSY07 proceedings, 4 pages, 6 eps figures
| null | null |
FR-THEP-07-08
|
hep-ph
| null |
We propose a means to discriminate between the two basic variants of Little
Higgs models, the Product Group and Simple Group models, at the next generation
of colliders. It relies on a special coupling of light pseudoscalar particles
present in Little Higgs models, the pseudoaxions, to the Z and the Higgs boson,
which is present only in Simple Group models. We discuss the collider
phenomenology of the pseudoaxion in the presence of such a coupling at the LHC,
where resonant production and decay of either the Higgs or the pseudoaxion
induced by that coupling can be observed for much of parameter space. The full
allowed range of parameters, including regions where the observability is
limited at the LHC, is covered by a future ILC, where double scalar production
would be a golden channel to look for.
|
[
{
"created": "Mon, 24 Sep 2007 16:56:20 GMT",
"version": "v1"
}
] |
2007-09-25
|
[
[
"Reuter",
"Jurgen",
""
]
] |
We propose a means to discriminate between the two basic variants of Little Higgs models, the Product Group and Simple Group models, at the next generation of colliders. It relies on a special coupling of light pseudoscalar particles present in Little Higgs models, the pseudoaxions, to the Z and the Higgs boson, which is present only in Simple Group models. We discuss the collider phenomenology of the pseudoaxion in the presence of such a coupling at the LHC, where resonant production and decay of either the Higgs or the pseudoaxion induced by that coupling can be observed for much of parameter space. The full allowed range of parameters, including regions where the observability is limited at the LHC, is covered by a future ILC, where double scalar production would be a golden channel to look for.
|
hep-ph/0210086
|
Hassib Amini
|
Hassib Amini
|
Radiative Corrections to Higgs Masses in $Z^{\prime}$ Models
|
14 pages, 4 figures
|
New J.Phys. 5 (2003) 49
|
10.1088/1367-2630/5/1/349
| null |
hep-ph
| null |
We calculate radiative corrections to the masses of the Higgs bosons in a
minimal supersymmetric model that contains an additional non-anomalous (U(1)')
gauge symmetry. With some fine-tuning of the (U(1)') charges of the Higgs
fields, it is possible to suppress the (Z)--(Z^{\prime}) mixing. We use this
fact, along with the lower bound on the lightest Higgs mass after LEPII era, as
a criterion to restrict the set of parameters in our analysis. We calculate the
mass of the lightest Higgs and its mixing with the other Higgs bosons, in a
large region of the parameter space.
|
[
{
"created": "Fri, 4 Oct 2002 21:29:12 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Oct 2002 21:42:24 GMT",
"version": "v2"
},
{
"created": "Wed, 25 Jun 2003 13:18:21 GMT",
"version": "v3"
}
] |
2009-11-07
|
[
[
"Amini",
"Hassib",
""
]
] |
We calculate radiative corrections to the masses of the Higgs bosons in a minimal supersymmetric model that contains an additional non-anomalous (U(1)') gauge symmetry. With some fine-tuning of the (U(1)') charges of the Higgs fields, it is possible to suppress the (Z)--(Z^{\prime}) mixing. We use this fact, along with the lower bound on the lightest Higgs mass after LEPII era, as a criterion to restrict the set of parameters in our analysis. We calculate the mass of the lightest Higgs and its mixing with the other Higgs bosons, in a large region of the parameter space.
|
hep-ph/9301278
|
Patrick O'Donnell
|
Patrick J. O'Donnell and Humphrey K.K. Tung
|
The Rare Decay $B\to K^{\ast}\gamma$: A More Precise Calculation
|
15 pages, UTPT-93-02, in REVTEX with one figure in eps
|
Phys.Rev. D48 (1993) 2145-2151
|
10.1103/PhysRevD.48.2145
| null |
hep-ph
| null |
Efforts to predict the rare exclusive decay $B\to K^{\ast}\gamma$ from the
well known inclusive decay $b\to s\gamma$ are frustrated by the effect of the
large recoil momentum. We show how to reduce the large uncertainty in
calculating this decay by relating $B\to K^{\ast}\gamma$ to the semileptonic
process $B\to\rho e\bar{\nu}$ using the heavy-quark symmetry in B decays and
SU(3) flavor symmetry. A direct measurement of the $q^{2}$-spectrum for the
semileptonic decay can provide accurate information for the exclusive rare
decay.
|
[
{
"created": "Tue, 26 Jan 1993 19:44:54 GMT",
"version": "v1"
}
] |
2009-10-22
|
[
[
"O'Donnell",
"Patrick J.",
""
],
[
"Tung",
"Humphrey K. K.",
""
]
] |
Efforts to predict the rare exclusive decay $B\to K^{\ast}\gamma$ from the well known inclusive decay $b\to s\gamma$ are frustrated by the effect of the large recoil momentum. We show how to reduce the large uncertainty in calculating this decay by relating $B\to K^{\ast}\gamma$ to the semileptonic process $B\to\rho e\bar{\nu}$ using the heavy-quark symmetry in B decays and SU(3) flavor symmetry. A direct measurement of the $q^{2}$-spectrum for the semileptonic decay can provide accurate information for the exclusive rare decay.
|
0809.0094
|
Shinya Kanemura
|
Eri Asakawa, Daisuke Harada, Shinya Kanemura, Yasuhiro Okada, Koji
Tsumura
|
Higgs boson pair production at a photon-photon collision in the two
Higgs doublet model
|
16 pages, 8 figures; added Appendix with a figure
| null |
10.1016/j.physletb.2009.01.050
|
KEK-TH-1271, UT-HET 014, IC/2008/59
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We calculate the cross section of Higgs boson pair production at a photon
collider in the two Higgs doublet model. We focus on the scenario in which the
lightest CP even Higgs boson ($h$) has the standard model like couplings to the
gauge bosons. We take into account the one-loop correction to the $hhh$
coupling as well as additional one-loop diagrams due to charged Higgs bosons to
the $\gamma\gamma\to hh$ helicity amplitudes. It is found that the full cross
section can be enhanced by both these effects to a considerable level. We
discuss the impact of these corrections on the $hhh$ coupling measurement at
the photon collider.
|
[
{
"created": "Sun, 31 Aug 2008 02:25:36 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Jan 2009 14:54:11 GMT",
"version": "v2"
}
] |
2009-11-13
|
[
[
"Asakawa",
"Eri",
""
],
[
"Harada",
"Daisuke",
""
],
[
"Kanemura",
"Shinya",
""
],
[
"Okada",
"Yasuhiro",
""
],
[
"Tsumura",
"Koji",
""
]
] |
We calculate the cross section of Higgs boson pair production at a photon collider in the two Higgs doublet model. We focus on the scenario in which the lightest CP even Higgs boson ($h$) has the standard model like couplings to the gauge bosons. We take into account the one-loop correction to the $hhh$ coupling as well as additional one-loop diagrams due to charged Higgs bosons to the $\gamma\gamma\to hh$ helicity amplitudes. It is found that the full cross section can be enhanced by both these effects to a considerable level. We discuss the impact of these corrections on the $hhh$ coupling measurement at the photon collider.
|
hep-ph/0204048
|
Ed Stoeffhaas
|
M. M. Block
|
Forward Compton Scattering, using Real Analytic Amplitudes
|
Latex2e, 6 pages, 2 postscript figures placed with epsfig.sty. Fixed
problem with Fig.1 placement. Version to be published in Phys. Rev. D
|
Phys.Rev. D65 (2002) 116005
|
10.1103/PhysRevD.65.116005
|
NUHEP 1000
|
hep-ph
| null |
We analyze forward Compton scattering, using real analytic amplitudes. By
fitting the total \gamma p scattering cross section data in the high energy
region 5 GeV < \sqrt s < 20 GeV, using a cross section rising as \ln^2 s, we
calculate \rho_{\gamma p}, the ratio of the real to the imaginary portion of
the the forward Compton scattering amplitude, and compare this to \rho_{nn},
the ratio of the even portions of the pp and p-bar p forward scattering
amplitudes. We find that the two \rho-values are, within errors, the same in
the c.m.s. energy region 5 GeV < \sqrt s < 200 GeV, as predicted by a
factorization theorem of Block and Kadailov.
|
[
{
"created": "Thu, 4 Apr 2002 03:38:53 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Apr 2002 19:59:22 GMT",
"version": "v2"
},
{
"created": "Tue, 16 Apr 2002 20:08:41 GMT",
"version": "v3"
},
{
"created": "Mon, 22 Apr 2002 18:12:44 GMT",
"version": "v4"
}
] |
2009-11-07
|
[
[
"Block",
"M. M.",
""
]
] |
We analyze forward Compton scattering, using real analytic amplitudes. By fitting the total \gamma p scattering cross section data in the high energy region 5 GeV < \sqrt s < 20 GeV, using a cross section rising as \ln^2 s, we calculate \rho_{\gamma p}, the ratio of the real to the imaginary portion of the the forward Compton scattering amplitude, and compare this to \rho_{nn}, the ratio of the even portions of the pp and p-bar p forward scattering amplitudes. We find that the two \rho-values are, within errors, the same in the c.m.s. energy region 5 GeV < \sqrt s < 200 GeV, as predicted by a factorization theorem of Block and Kadailov.
|
2207.05578
|
Goutam Das
|
Guido Bell, Kevin Brune, Goutam Das and Marcel Wald
|
The NNLO quark beam function for jet-veto resummation
|
18 pages, 2 figures, 1 table, 8 ancillary files, Journal version
| null |
10.1007/JHEP01(2023)083
|
SI-HEP-2022-13, P3H-22-064
|
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We consider the quark beam function that describes collinear initial-state
radiation that is constrained by a veto on reconstructed jets. As the veto is
imposed on the transverse momenta of the jets, the beam function is subject to
rapidity divergences, and we use the collinear-anomaly framework to extract the
perturbative matching kernels to next-to-next-to-leading order (NNLO) in the
strong-coupling expansion. Our calculation is based on a novel framework that
automates the computation of beam functions in Mellin space and it provides the
ingredients to extend jet-veto resummations for quark-initiated processes to
NNLL$'$ accuracy.
|
[
{
"created": "Tue, 12 Jul 2022 15:01:20 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Jan 2023 15:48:00 GMT",
"version": "v2"
}
] |
2023-02-01
|
[
[
"Bell",
"Guido",
""
],
[
"Brune",
"Kevin",
""
],
[
"Das",
"Goutam",
""
],
[
"Wald",
"Marcel",
""
]
] |
We consider the quark beam function that describes collinear initial-state radiation that is constrained by a veto on reconstructed jets. As the veto is imposed on the transverse momenta of the jets, the beam function is subject to rapidity divergences, and we use the collinear-anomaly framework to extract the perturbative matching kernels to next-to-next-to-leading order (NNLO) in the strong-coupling expansion. Our calculation is based on a novel framework that automates the computation of beam functions in Mellin space and it provides the ingredients to extend jet-veto resummations for quark-initiated processes to NNLL$'$ accuracy.
|
1407.1694
|
Scientific Information Service CERN
|
K. Kawagoe and M. Mulders (CERN)(eds)
|
Proceedings of the 1st Asia-Europe-Pacific School of High-Energy Physics
(AEPSHEP 12), Fukuoka, Japan, 14 - 27 Oct 2012
|
8 lectures, 285 pages, published as CERN Yellow Report
https://cds.cern.ch/record/1443909
| null |
10.5170/CERN-2014-001
|
CERN-2014-001 ; KEK-Proceedings-2013-8
|
hep-ph hep-th
|
http://creativecommons.org/licenses/by/3.0/
|
The Asia-Europe-Pacific School of High-Energy Physics is intended to give
young physicists an introduction to the theoretical aspects of recent advances
in elementary particle physics. These proceedings contain lectures on quantum
field theory, quantum chromodynamics, flavour physics and CP-violation, physics
beyond the Standard Model, neutrino physics, particle cosmology, heavy-ion
physics, as well as a presentation of recent results from the Large Hadron
Collider (LHC), practical statistics for particle physicists and a short
introduction to the principles of particle physics instrumentation.
|
[
{
"created": "Mon, 7 Jul 2014 12:53:46 GMT",
"version": "v1"
}
] |
2014-07-08
|
[
[
"Kawagoe",
"K.",
"",
"CERN"
],
[
"Mulders",
"M.",
"",
"CERN"
]
] |
The Asia-Europe-Pacific School of High-Energy Physics is intended to give young physicists an introduction to the theoretical aspects of recent advances in elementary particle physics. These proceedings contain lectures on quantum field theory, quantum chromodynamics, flavour physics and CP-violation, physics beyond the Standard Model, neutrino physics, particle cosmology, heavy-ion physics, as well as a presentation of recent results from the Large Hadron Collider (LHC), practical statistics for particle physicists and a short introduction to the principles of particle physics instrumentation.
|
hep-ph/0012207
|
Jose Luis Lucio M.
|
J. L. Lucio M. and J. Pestieau
|
Resonance Propagation and Threshold Singularities
|
5 pages, no figures, revtex
|
Mod.Phys.Lett. A16 (2001) 1315-1320
|
10.1142/S0217732301004534
| null |
hep-ph
| null |
We consider the problem of propagation of an unstable particle in the
framework of Quantum Field Theory. Using unitarity, we show that a real
renormalization constant free of threshold singularities naturally arises.
|
[
{
"created": "Sat, 16 Dec 2000 19:29:31 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"M.",
"J. L. Lucio",
""
],
[
"Pestieau",
"J.",
""
]
] |
We consider the problem of propagation of an unstable particle in the framework of Quantum Field Theory. Using unitarity, we show that a real renormalization constant free of threshold singularities naturally arises.
|
hep-ph/9611444
|
FJ Yndurain
|
J. Vermaseren, F. Barreiro, L. Labarga and F. J. Yndur\'ain
|
Pomerons and Jet Events at HERA
|
Latex file
|
Phys.Lett. B418 (1998) 363-370
|
10.1016/S0370-2693(97)01229-X
|
FTUAM 96-7
|
hep-ph
| null |
We study two and three jet events with a large rapidity gap at HERA. Unlike
in the Ingelman-Schlein approach we do not adscribe a structure to the Pomeron.
Instead, the coupling of the Pomeron to quarks or gluons is taken pointlike,
which makes the model easy to test: the only degrees of freedom are the
coupling constants of the Pomeron to the quarks or the gluons and a cutoff
procedure to keep the Pomeron-gluon coupling well behaved.
|
[
{
"created": "Wed, 27 Nov 1996 12:03:34 GMT",
"version": "v1"
}
] |
2009-10-30
|
[
[
"Vermaseren",
"J.",
""
],
[
"Barreiro",
"F.",
""
],
[
"Labarga",
"L.",
""
],
[
"Ynduráin",
"F. J.",
""
]
] |
We study two and three jet events with a large rapidity gap at HERA. Unlike in the Ingelman-Schlein approach we do not adscribe a structure to the Pomeron. Instead, the coupling of the Pomeron to quarks or gluons is taken pointlike, which makes the model easy to test: the only degrees of freedom are the coupling constants of the Pomeron to the quarks or the gluons and a cutoff procedure to keep the Pomeron-gluon coupling well behaved.
|
hep-ph/9409371
| null |
K.G.Chetyrkin, C.A.Dominguez, D.Pirjol and K.Schilcher
|
Mass singularities in light quark correlators: the strange quark case
|
19 pages, Latex + 5 figures as uuencoded PS files, MZ-TH/94-21,
UCT-TP 214/94
|
Phys.Rev. D51 (1995) 5090-5100
|
10.1103/PhysRevD.51.5090
| null |
hep-ph
| null |
The correlators of light-quark currents contain mass-singularities of the
form log(m^2/Q^2). It has been known for quite some time that these mass-
logarithms can be absorbed into the vacuum expectation values of other
operators of appropriate dimension, provided that schemes without normal-
ordering are used. We discuss in detail this procedure for the case of the mass
logarithms m^4 log(m^2/Q^2), including also the mixing with the other
dimension-4 operators to two-loop order. As an application we present an
improved QCD sum rule determination of the strange-quark mass. We obtain m_s(1
GeV)=171 \pm 15 MeV.
|
[
{
"created": "Wed, 21 Sep 1994 14:08:57 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Chetyrkin",
"K. G.",
""
],
[
"Dominguez",
"C. A.",
""
],
[
"Pirjol",
"D.",
""
],
[
"Schilcher",
"K.",
""
]
] |
The correlators of light-quark currents contain mass-singularities of the form log(m^2/Q^2). It has been known for quite some time that these mass- logarithms can be absorbed into the vacuum expectation values of other operators of appropriate dimension, provided that schemes without normal- ordering are used. We discuss in detail this procedure for the case of the mass logarithms m^4 log(m^2/Q^2), including also the mixing with the other dimension-4 operators to two-loop order. As an application we present an improved QCD sum rule determination of the strange-quark mass. We obtain m_s(1 GeV)=171 \pm 15 MeV.
|
hep-ph/0412180
|
Chuan Hung Chen
|
C.H. Chen and C.Q. Geng
|
T violation in $B\to K \phi \phi $ decays
|
11 pages, 2 figures, to appear in Phys. Lett. B
|
Phys.Lett.B607:115-122,2005
|
10.1016/j.physletb.2004.12.042
| null |
hep-ph
| null |
We present the general form of the decay width angular distributions with
T-odd terms in $B\to K \phi \phi$ decays. We concentrate on the T violating
effects by considering various possible T-odd momentum correlations. In a
generic class of CP violating new physics interactions, we illustrate that the
T violating effect could be more than 10%.
|
[
{
"created": "Tue, 14 Dec 2004 13:44:40 GMT",
"version": "v1"
}
] |
2014-11-18
|
[
[
"Chen",
"C. H.",
""
],
[
"Geng",
"C. Q.",
""
]
] |
We present the general form of the decay width angular distributions with T-odd terms in $B\to K \phi \phi$ decays. We concentrate on the T violating effects by considering various possible T-odd momentum correlations. In a generic class of CP violating new physics interactions, we illustrate that the T violating effect could be more than 10%.
|
hep-ph/9908481
|
Fu-Guang Cao
|
Fu-Guang Cao and A. I. Signal (Institute of Fundamental Sciences,
Massey University, New Zealand)
|
Two analytical constraints on the $\eta$-$\eta^\prime$ mixing
|
8 pages, RevTex, no figures
|
Phys.Rev. D60 (1999) 114012
|
10.1103/PhysRevD.60.114012
| null |
hep-ph
| null |
We obtained two analytical constraints on the $\eta$-$\eta^\prime$ mixing
parameters by considering two-photon decays of $\eta$ and $\eta^\prime$ [$\eta
(\eta^\prime) \ra \gamma \gamma$], and productions of $\eta$ and $\eta^\prime$
in the $e^+ e^-$ scattering at large momentum transfer ($Q^2 \ra \infty$).
Using the data given in the PDG98 for the decay processes and recent CLEO
measurements on the meson-photon transition form factors, we estimate for the
$\eta_8$-$\eta_1$ mixing scheme the mixing angle to be $\theta=-14.5^\circ \pm
2.0^\circ$ and the ratio of the decay constants of singlet to octet to be
$f_1/f_8=1.17 \pm 0.08$. Applying our approach to the recently proposed $q
\qbar$-$s \sbar$ mixing scheme, we obtain the mixing angle to be
$\phi=39.8^\circ \pm 1.8^\circ$ and the ratio of the decay constants of
$s\sbar$ state to $q\qbar$ state to be $f_s/f_q=1.20 \pm 0.10$.
|
[
{
"created": "Thu, 26 Aug 1999 22:26:06 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Jan 2000 00:17:35 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Cao",
"Fu-Guang",
"",
"Institute of Fundamental Sciences,\n Massey University, New Zealand"
],
[
"Signal",
"A. I.",
"",
"Institute of Fundamental Sciences,\n Massey University, New Zealand"
]
] |
We obtained two analytical constraints on the $\eta$-$\eta^\prime$ mixing parameters by considering two-photon decays of $\eta$ and $\eta^\prime$ [$\eta (\eta^\prime) \ra \gamma \gamma$], and productions of $\eta$ and $\eta^\prime$ in the $e^+ e^-$ scattering at large momentum transfer ($Q^2 \ra \infty$). Using the data given in the PDG98 for the decay processes and recent CLEO measurements on the meson-photon transition form factors, we estimate for the $\eta_8$-$\eta_1$ mixing scheme the mixing angle to be $\theta=-14.5^\circ \pm 2.0^\circ$ and the ratio of the decay constants of singlet to octet to be $f_1/f_8=1.17 \pm 0.08$. Applying our approach to the recently proposed $q \qbar$-$s \sbar$ mixing scheme, we obtain the mixing angle to be $\phi=39.8^\circ \pm 1.8^\circ$ and the ratio of the decay constants of $s\sbar$ state to $q\qbar$ state to be $f_s/f_q=1.20 \pm 0.10$.
|
1501.02787
|
Kenji Nishiwaki
|
Tomo-hiro Abe, Yukihiro Fujimoto, Tatsuo Kobayashi, Takashi Miura,
Kenji Nishiwaki, Makoto Sakamoto, and Yoshiyuki Tatsuta
|
Classification of three-generation models on magnetized orbifolds
|
28 pages (main body and references) + 65 pages (full list of
classification), 22 tables (v1); typos corrected, problem in sentence fixed
(v2)
|
Nucl.Phys. B894 (2015) 374-406
|
10.1016/j.nuclphysb.2015.03.004
|
EPHOH-15-001, KIAS-P15002, KOBE-TH-15-01, KUNS-2535, OU-HET-848,
WU-HEP-15-01
|
hep-ph hep-th
|
http://creativecommons.org/licenses/by/3.0/
|
We classify the combinations of parameters which lead three generations of
quarks and leptons in the framework of magnetized twisted orbifolds on
$T^2/Z_2$, $T^2/Z_3$, $T^2/Z_4$ and $T^2/Z_6$ with allowing nonzero discretized
Wilson line phases and Scherk-Schwarz phases. We also analyze two actual
examples with nonzero phases leading to one-pair Higgs and five-pair Higgses
and discuss the difference from the results without nonzero phases studied
previously.
|
[
{
"created": "Mon, 12 Jan 2015 20:14:27 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Apr 2015 14:10:07 GMT",
"version": "v2"
}
] |
2015-06-23
|
[
[
"Abe",
"Tomo-hiro",
""
],
[
"Fujimoto",
"Yukihiro",
""
],
[
"Kobayashi",
"Tatsuo",
""
],
[
"Miura",
"Takashi",
""
],
[
"Nishiwaki",
"Kenji",
""
],
[
"Sakamoto",
"Makoto",
""
],
[
"Tatsuta",
"Yoshiyuki",
""
]
] |
We classify the combinations of parameters which lead three generations of quarks and leptons in the framework of magnetized twisted orbifolds on $T^2/Z_2$, $T^2/Z_3$, $T^2/Z_4$ and $T^2/Z_6$ with allowing nonzero discretized Wilson line phases and Scherk-Schwarz phases. We also analyze two actual examples with nonzero phases leading to one-pair Higgs and five-pair Higgses and discuss the difference from the results without nonzero phases studied previously.
|
2307.15565
|
Mar\'ia Dias Astros
|
Maria Dias Astros and Stefan Vogl
|
Boosting the production of sterile neutrino dark matter with
self-interactions
|
17 pages plus appendices. Matches journal version
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Sterile neutrinos are well-motivated and simple dark matter (DM) candidates.
However, sterile neutrino DM produced through oscillations by the
Dodelson-Widrow mechanism is excluded by current $X$-ray observations and
bounds from structure formation. One minimal extension, that preserves the
attractive features of this scenario, is self-interactions among sterile
neutrinos. In this work, we analyze how sterile neutrino self-interactions
mediated by a scalar affect the production of keV sterile neutrinos for a wide
range of mediator masses. We find four distinct regimes of production
characterized by different phenomena, including partial thermalization for low
and intermediate masses and resonant production for heavier mediators. We show
that significant new regions of parameter space become available which provide
a target for future observations.
|
[
{
"created": "Fri, 28 Jul 2023 14:02:39 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Sep 2023 14:01:19 GMT",
"version": "v2"
},
{
"created": "Thu, 15 Feb 2024 10:25:13 GMT",
"version": "v3"
}
] |
2024-02-16
|
[
[
"Astros",
"Maria Dias",
""
],
[
"Vogl",
"Stefan",
""
]
] |
Sterile neutrinos are well-motivated and simple dark matter (DM) candidates. However, sterile neutrino DM produced through oscillations by the Dodelson-Widrow mechanism is excluded by current $X$-ray observations and bounds from structure formation. One minimal extension, that preserves the attractive features of this scenario, is self-interactions among sterile neutrinos. In this work, we analyze how sterile neutrino self-interactions mediated by a scalar affect the production of keV sterile neutrinos for a wide range of mediator masses. We find four distinct regimes of production characterized by different phenomena, including partial thermalization for low and intermediate masses and resonant production for heavier mediators. We show that significant new regions of parameter space become available which provide a target for future observations.
|
1805.00568
|
Anirban Biswas
|
Anirban Biswas, Sandhya Choubey, Sarif Khan
|
Inverse seesaw and dark matter in a gauged ${\rm B-L}$ extension with
flavour symmetry
|
30 pages, 11 figures, 3 tables, minor changes in the text, conclusion
remains unchanged, version published in JHEP
|
JHEP 1808(2018)062
|
10.1007/JHEP08(2018)062
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose a model which generates neutrino masses by the inverse seesaw
mechanism, provides a viable dark matter candidate and explains the muon
($g-2$) anomaly. The Standard Model (SM) gauge group is extended with a gauged
U(1)$_{\rm B-L}$ as well as a gauged U(1)$_{\rm L_{\mu} - L_{\tau}}$. While
U(1)$_{\rm L_{\mu} - L_{\tau}}$ is anomaly free, the anomaly introduced by
U(1)$_{\rm B-L}$ is cancelled between the six SM singlet fermions introduced
for the inverse seesaw mechanism and four additional chiral fermions introduced
in this model. After spontaneous symmetry breaking the four chiral fermionic
degrees of freedom combine to give two Dirac states. The lightest Dirac fermion
becomes stable and hence the dark matter candidate. We focus on the region of
the parameter space where the dark matter annihilates to the right-handed
neutrinos, relating the dark matter sector with the neutrino sector. The
U(1)$_{\rm L_{\mu} - L_{\tau}}$ gauge symmetry provides a flavour structure to
the inverse seesaw framework, successfully explaining the observed neutrino
masses and mixings. We study the model parameters in the light of neutrino
oscillation data and find correlation between them. Values of some of the model
parameters are shown to be mutually exclusive between normal and inverted
ordering of the neutrino mass eigenstates. Moreover, the muon ($g-2$) anomaly
can be explained by the additional contribution arising from U(1)$_{\rm L_{\mu}
- L_{\tau}}$ gauge boson.
|
[
{
"created": "Tue, 1 May 2018 22:08:01 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Aug 2018 20:00:53 GMT",
"version": "v2"
}
] |
2018-08-20
|
[
[
"Biswas",
"Anirban",
""
],
[
"Choubey",
"Sandhya",
""
],
[
"Khan",
"Sarif",
""
]
] |
We propose a model which generates neutrino masses by the inverse seesaw mechanism, provides a viable dark matter candidate and explains the muon ($g-2$) anomaly. The Standard Model (SM) gauge group is extended with a gauged U(1)$_{\rm B-L}$ as well as a gauged U(1)$_{\rm L_{\mu} - L_{\tau}}$. While U(1)$_{\rm L_{\mu} - L_{\tau}}$ is anomaly free, the anomaly introduced by U(1)$_{\rm B-L}$ is cancelled between the six SM singlet fermions introduced for the inverse seesaw mechanism and four additional chiral fermions introduced in this model. After spontaneous symmetry breaking the four chiral fermionic degrees of freedom combine to give two Dirac states. The lightest Dirac fermion becomes stable and hence the dark matter candidate. We focus on the region of the parameter space where the dark matter annihilates to the right-handed neutrinos, relating the dark matter sector with the neutrino sector. The U(1)$_{\rm L_{\mu} - L_{\tau}}$ gauge symmetry provides a flavour structure to the inverse seesaw framework, successfully explaining the observed neutrino masses and mixings. We study the model parameters in the light of neutrino oscillation data and find correlation between them. Values of some of the model parameters are shown to be mutually exclusive between normal and inverted ordering of the neutrino mass eigenstates. Moreover, the muon ($g-2$) anomaly can be explained by the additional contribution arising from U(1)$_{\rm L_{\mu} - L_{\tau}}$ gauge boson.
|
1607.03374
|
Takayasu Sekihara
|
Takayasu Sekihara (JAEA, Ibaraki)
|
Dynamically Generated $\Xi (1690)$
|
4 pages, 4 EPS figures, talk given at the 12th International
Conference on Hypernuclear and Strange Particle Physics (HYP2015), Tohoku,
Japan, 7-12 Sep. 2015
| null |
10.7566/JPSCP.17.072007
| null |
hep-ph hep-ex hep-lat nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show that the $\Xi (1690)$ resonance can be dynamically generated in the
$s$-wave $\bar{K} \Sigma$-$\bar{K} \Lambda$-$\pi \Xi$-$\eta \Xi$
coupled-channels chiral unitary approach. In our model, the $\Xi (1690)$
resonance appears near the $\bar{K} \Sigma$ threshold as a $\bar{K} \Sigma$
molecular state and the experimental data are reproduced well. We discuss
properties of the dynamically generated $\Xi (1690)$.
|
[
{
"created": "Tue, 12 Jul 2016 14:40:16 GMT",
"version": "v1"
}
] |
2017-08-02
|
[
[
"Sekihara",
"Takayasu",
"",
"JAEA, Ibaraki"
]
] |
We show that the $\Xi (1690)$ resonance can be dynamically generated in the $s$-wave $\bar{K} \Sigma$-$\bar{K} \Lambda$-$\pi \Xi$-$\eta \Xi$ coupled-channels chiral unitary approach. In our model, the $\Xi (1690)$ resonance appears near the $\bar{K} \Sigma$ threshold as a $\bar{K} \Sigma$ molecular state and the experimental data are reproduced well. We discuss properties of the dynamically generated $\Xi (1690)$.
|
1603.04349
|
Heikki M\"antysaari
|
Heikki M\"antysaari and Bj\"orn Schenke
|
Evidence of strong proton shape fluctuations from incoherent diffraction
|
7 pages, 4 figures. v2: typos fixed and references added. To be
published in PRL
|
Phys. Rev. Lett. 117, 052301 (2016)
|
10.1103/PhysRevLett.117.052301
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show within the saturation framework that measurements of exclusive vector
meson production at high energy provide evidence for strong geometric
fluctuations of the proton. In comparison, the effect of saturation scale and
color charge fluctuations is weak. This knowledge will allow detailed future
measurements of the incoherent cross section to tightly constrain the
fluctuating geometry of the proton as a function of the parton momentum
fraction $x$.
|
[
{
"created": "Mon, 14 Mar 2016 17:11:33 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Jul 2016 14:27:32 GMT",
"version": "v2"
}
] |
2016-07-26
|
[
[
"Mäntysaari",
"Heikki",
""
],
[
"Schenke",
"Björn",
""
]
] |
We show within the saturation framework that measurements of exclusive vector meson production at high energy provide evidence for strong geometric fluctuations of the proton. In comparison, the effect of saturation scale and color charge fluctuations is weak. This knowledge will allow detailed future measurements of the incoherent cross section to tightly constrain the fluctuating geometry of the proton as a function of the parton momentum fraction $x$.
|
hep-ph/9507265
|
Joannis Papavassiliou
|
Joannis Papavassiliou, Kostas Philippides, and Ken Sasaki
|
Two-loop electroweak corrections to the $\rho$ parameter beyond the
leading approximation
|
40 pages, TeXsis, uu encoded ps files, 14 figures included
|
Phys.Rev.D53:3942-3961,1996
|
10.1103/PhysRevD.53.3942
|
NYU-TH-95/07/01
|
hep-ph
| null |
We show that in the framework of the pinch technique the universal part of
the $\rho$ parameter can be meaningfully defined, beyond one loop. The
universal part so obtained satisfies the crucial requirements of
gauge-independence, finiteness, and process-independence, even when subleading
contributions of the top quark are included. The mechanism which enforces the
aforementioned properties is explained in detail, and several subtle field
theoretical issues are discussed. Explicit calculations of the sub-leading
two-loop corrections of order $O(G_{\mu}^{2}m^{2}_{t}M_{Z}^{2})$ are carried
out in the context of an $SU(2)$ model, with $M_{W}=M_{Z}$, and various
intermediate and final results are reported.
|
[
{
"created": "Sat, 8 Jul 1995 17:59:31 GMT",
"version": "v1"
}
] |
2011-01-13
|
[
[
"Papavassiliou",
"Joannis",
""
],
[
"Philippides",
"Kostas",
""
],
[
"Sasaki",
"Ken",
""
]
] |
We show that in the framework of the pinch technique the universal part of the $\rho$ parameter can be meaningfully defined, beyond one loop. The universal part so obtained satisfies the crucial requirements of gauge-independence, finiteness, and process-independence, even when subleading contributions of the top quark are included. The mechanism which enforces the aforementioned properties is explained in detail, and several subtle field theoretical issues are discussed. Explicit calculations of the sub-leading two-loop corrections of order $O(G_{\mu}^{2}m^{2}_{t}M_{Z}^{2})$ are carried out in the context of an $SU(2)$ model, with $M_{W}=M_{Z}$, and various intermediate and final results are reported.
|
2107.14548
|
Haiying Cai
|
Haiying Cai, Giacomo Cacciapaglia and Seung J. Lee
|
Massive Gravitons as Feebly Interacting Dark Matter Candidates
|
6 pages plus appendix, 2 figures; published version
| null |
10.1103/PhysRevLett.128.081806
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We detailed our discovery of a chiral enhancement in the production cross
sections of massive spin-2 gravitons, below the electroweak symmetry breaking
scale, that makes them ideal dark matter candidates for the freeze-in
mechanism. The result is independent of the physics at high scales, and points
toward masses in the keV- MeV range. The graviton is, therefore, a sub-MeV dark
matter particle, as favored by the small scale galaxy structures. We apply the
novel calculation to a Randall-Sundrum model with multiple branes, showing a
significant parameter space where the first two massive gravitons saturate the
dark matter relic density.
|
[
{
"created": "Fri, 30 Jul 2021 10:56:29 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Mar 2023 10:10:06 GMT",
"version": "v2"
}
] |
2023-03-10
|
[
[
"Cai",
"Haiying",
""
],
[
"Cacciapaglia",
"Giacomo",
""
],
[
"Lee",
"Seung J.",
""
]
] |
We detailed our discovery of a chiral enhancement in the production cross sections of massive spin-2 gravitons, below the electroweak symmetry breaking scale, that makes them ideal dark matter candidates for the freeze-in mechanism. The result is independent of the physics at high scales, and points toward masses in the keV- MeV range. The graviton is, therefore, a sub-MeV dark matter particle, as favored by the small scale galaxy structures. We apply the novel calculation to a Randall-Sundrum model with multiple branes, showing a significant parameter space where the first two massive gravitons saturate the dark matter relic density.
|
1605.09242
|
Mihailo Backovic
|
Chiara Arina, Mihailo Backovi\'c, Eric Conte, Benjamin Fuks, Jun Guo,
Jan Heisig, Beno\^it Hespel, Michael Kr\"amer, Fabio Maltoni, Antony Martini,
Kentarou Mawatari, Mathieu Pellen and Eleni Vryonidou
|
A comprehensive approach to dark matter studies: exploration of
simplified top-philic models
|
52 pages, 23 figures
|
JHEP 1611 (2016) 111
|
10.1007/JHEP11(2016)111
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Studies of dark matter lie at the interface of collider physics, astrophysics
and cosmology. Constraining models featuring dark matter candidates entails the
capability to provide accurate predictions for large sets of observables and
compare them to a wide spectrum of data. We present a framework which, starting
from a model lagrangian, allows one to consistently and systematically make
predictions, as well as to confront those predictions with a multitude of
experimental results. As an application, we consider a class of simplified dark
matter models where a scalar mediator couples only to the top quark and a
fermionic dark sector (i.e. the simplified top-philic dark matter model). We
study in detail the complementarity of relic density, direct/indirect detection
and collider searches in constraining the multi-dimensional model parameter
space, and efficiently identify regions where individual approaches to dark
matter detection provide the most stringent bounds. In the context of collider
studies of dark matter, we point out the complementarity of LHC searches in
probing different regions of the model parameter space with final states
involving top quarks, photons, jets and/or missing energy. Our study of dark
matter production at the LHC goes beyond the tree-level approximation and we
show examples of how higher-order corrections to dark matter production
processes can affect the interpretation of the experimental results.
|
[
{
"created": "Mon, 30 May 2016 14:13:48 GMT",
"version": "v1"
}
] |
2017-01-24
|
[
[
"Arina",
"Chiara",
""
],
[
"Backović",
"Mihailo",
""
],
[
"Conte",
"Eric",
""
],
[
"Fuks",
"Benjamin",
""
],
[
"Guo",
"Jun",
""
],
[
"Heisig",
"Jan",
""
],
[
"Hespel",
"Benoît",
""
],
[
"Krämer",
"Michael",
""
],
[
"Maltoni",
"Fabio",
""
],
[
"Martini",
"Antony",
""
],
[
"Mawatari",
"Kentarou",
""
],
[
"Pellen",
"Mathieu",
""
],
[
"Vryonidou",
"Eleni",
""
]
] |
Studies of dark matter lie at the interface of collider physics, astrophysics and cosmology. Constraining models featuring dark matter candidates entails the capability to provide accurate predictions for large sets of observables and compare them to a wide spectrum of data. We present a framework which, starting from a model lagrangian, allows one to consistently and systematically make predictions, as well as to confront those predictions with a multitude of experimental results. As an application, we consider a class of simplified dark matter models where a scalar mediator couples only to the top quark and a fermionic dark sector (i.e. the simplified top-philic dark matter model). We study in detail the complementarity of relic density, direct/indirect detection and collider searches in constraining the multi-dimensional model parameter space, and efficiently identify regions where individual approaches to dark matter detection provide the most stringent bounds. In the context of collider studies of dark matter, we point out the complementarity of LHC searches in probing different regions of the model parameter space with final states involving top quarks, photons, jets and/or missing energy. Our study of dark matter production at the LHC goes beyond the tree-level approximation and we show examples of how higher-order corrections to dark matter production processes can affect the interpretation of the experimental results.
|
2308.04497
|
Ajay Kaladharan
|
Ajay Kaladharan and Shaikh Saad
|
Fermion mass, Axion dark matter, and Leptogenesis in SO(10) GUT
|
14 pages+references, 1 figure, 1 table: Matches with published
version, Comments are welcome
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
SO(10) grand unified theory with minimum parameters in the Yukawa sector
employs the Peccei-Quinn symmetry that solves the strong CP problem. Such an
economical Yukawa sector is highly appealing and has been extensively studied
in the literature. However, when the running of the renormalization group
equations of the Yukawa couplings are considered, this scenario shows somewhat
tension with the observed fermion masses and mixing. In this work, we propose
an extension of the minimal framework that alleviates this tension by
introducing only a few new parameters. The proposed model consists of a fermion
in the fundamental and a scalar in the spinorial representations. While the
latter is needed to implement the Peccei-Quinn symmetry successfully, the
presence of both is essential in obtaining an excellent fit to the fermion mass
spectrum. In our model, axions serve the role of dark matter, and the
out-of-equilibrium decays of the right-handed neutrinos successfully generate
the matter-antimatter symmetry of the Universe.
|
[
{
"created": "Tue, 8 Aug 2023 18:02:38 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Mar 2024 18:40:52 GMT",
"version": "v2"
}
] |
2024-03-08
|
[
[
"Kaladharan",
"Ajay",
""
],
[
"Saad",
"Shaikh",
""
]
] |
SO(10) grand unified theory with minimum parameters in the Yukawa sector employs the Peccei-Quinn symmetry that solves the strong CP problem. Such an economical Yukawa sector is highly appealing and has been extensively studied in the literature. However, when the running of the renormalization group equations of the Yukawa couplings are considered, this scenario shows somewhat tension with the observed fermion masses and mixing. In this work, we propose an extension of the minimal framework that alleviates this tension by introducing only a few new parameters. The proposed model consists of a fermion in the fundamental and a scalar in the spinorial representations. While the latter is needed to implement the Peccei-Quinn symmetry successfully, the presence of both is essential in obtaining an excellent fit to the fermion mass spectrum. In our model, axions serve the role of dark matter, and the out-of-equilibrium decays of the right-handed neutrinos successfully generate the matter-antimatter symmetry of the Universe.
|
hep-ph/0506095
|
Vladislav Pantuev S.
|
V.S. Pantuev
|
Jet absorption and corona effect at RHIC. Extracting collision geometry
from experimental data
|
Version published in JETP Letters
|
JETPLett.85:104-108,2007
|
10.1134/S0021364007020026
| null |
hep-ph
| null |
We demonstrate a possible existence of a finite formation time of strongly
interacting plasma in nuclear collisions at RHIC from recent experimental data.
To show this, we use a simple model based on Monte Carlo simulation of
nucleus-nucleus collisions with realistic nuclear density distribution. The
most striking feature of the experimental data - an absence of absorption of
high transverse momentum pions in the reaction plane direction for
mid-peripheral collisions - points to the presence of a surface zone with no
absorption and strong suppression in the inner core. A natural interpretation
of such a zone could be the plasma formation time T~2-3 fm/c. The existence of
a formation time could dramatically change our understanding of many
experimentally observed features. With this assumption we describe the angular
anisotropy of high transverse momentum pions with respect to the reaction plane
and the centrality dependence of nuclear modification factor in Au+Au and Cu+Cu
collisions.
|
[
{
"created": "Thu, 9 Jun 2005 17:46:41 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Nov 2005 16:27:22 GMT",
"version": "v2"
},
{
"created": "Mon, 14 May 2007 20:23:05 GMT",
"version": "v3"
}
] |
2008-11-26
|
[
[
"Pantuev",
"V. S.",
""
]
] |
We demonstrate a possible existence of a finite formation time of strongly interacting plasma in nuclear collisions at RHIC from recent experimental data. To show this, we use a simple model based on Monte Carlo simulation of nucleus-nucleus collisions with realistic nuclear density distribution. The most striking feature of the experimental data - an absence of absorption of high transverse momentum pions in the reaction plane direction for mid-peripheral collisions - points to the presence of a surface zone with no absorption and strong suppression in the inner core. A natural interpretation of such a zone could be the plasma formation time T~2-3 fm/c. The existence of a formation time could dramatically change our understanding of many experimentally observed features. With this assumption we describe the angular anisotropy of high transverse momentum pions with respect to the reaction plane and the centrality dependence of nuclear modification factor in Au+Au and Cu+Cu collisions.
|
hep-ph/9302283
| null |
M.C. Gonzalez-Garcia, F. Halzen, R.A. Vazquez, and E Zas
|
Empirical Determination of the Very High Energy Heavy Quark Cross
Section from Non-Accelerator Data
|
(8 pages, latex file, 3 figures available upon request) MAD/PH/740
|
Phys.Rev. D49 (1994) 2310-2315
|
10.1103/PhysRevD.49.2310
| null |
hep-ph
| null |
To cosmic rays incident near the horizon the Earth's atmosphere represents a
beam dump with a slant depth reaching 36000~g~cm$^{-2}$ at $90^\circ$. The
prompt decay of a heavy quark produced by very high energy cosmic ray showers
will leave an unmistakable signature in this dump. We translate the failure of
experiments to detect such a signal into an upper limit on the heavy quark
hadroproduction cross section in the energy region beyond existing
accelerators. Our results disfavor any rapid growth of the cross section or the
gluon structure function beyond very conservative estimates based on
perturbative QCD.
|
[
{
"created": "Sat, 20 Feb 1993 20:59:00 GMT",
"version": "v1"
}
] |
2009-10-22
|
[
[
"Gonzalez-Garcia",
"M. C.",
""
],
[
"Halzen",
"F.",
""
],
[
"Vazquez",
"R. A.",
""
],
[
"Zas",
"E",
""
]
] |
To cosmic rays incident near the horizon the Earth's atmosphere represents a beam dump with a slant depth reaching 36000~g~cm$^{-2}$ at $90^\circ$. The prompt decay of a heavy quark produced by very high energy cosmic ray showers will leave an unmistakable signature in this dump. We translate the failure of experiments to detect such a signal into an upper limit on the heavy quark hadroproduction cross section in the energy region beyond existing accelerators. Our results disfavor any rapid growth of the cross section or the gluon structure function beyond very conservative estimates based on perturbative QCD.
|
1301.1683
|
Ethan Neil
|
Joachim Kopp, Ethan T. Neil, Reinard Primulando and Jure Zupan
|
From gamma ray line signals of dark matter to the LHC
|
27 pages, 10 figures. v2: added references, fixed import-order issue
with cleveref and hyperref. v3: updated to journal version. v4: erratum
correction to figs. 7-8 for monojet/monophoton cross-sections
|
Phys.Dark.Univ. 2 (2013) 22-34
|
10.1016/j.dark.2013.02.001
|
FERMILAB-PUB-13-006-T
|
hep-ph astro-ph.CO hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We explore the relationship between astrophysical gamma-ray signals and LHC
signatures for a class of phenomenologically successful secluded dark matter
models, motivated by recent evidence for a ~130 GeV gamma-ray line. We consider
in detail scenarios in which interactions between the dark sector and the
standard model are mediated by a vev-less scalar field \phi, transforming as an
N-plet (N > 3) under SU(2)_L. Since some of the component fields of \phi carry
large electric charges, loop induced dark matter annihilation to \gamma \gamma
and \gamma Z can be enhanced without the need for non-perturbatively large
couplings, and without overproduction of continuum gamma-rays from other final
states. We discuss prospects for other experimental tests, including dark
matter-nucleon scattering and production of \phi at the LHC, where future
searches for anomalous charged tracks may be sensitive. The first LHC hints
could come from the Higgs sector, where loop corrections involving \phi lead to
significantly modified h to \gamma \gamma and h to \gamma Z branching ratios.
|
[
{
"created": "Tue, 8 Jan 2013 21:00:03 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Jan 2013 20:29:08 GMT",
"version": "v2"
},
{
"created": "Wed, 20 Mar 2013 16:45:42 GMT",
"version": "v3"
},
{
"created": "Sun, 18 Aug 2013 15:00:56 GMT",
"version": "v4"
}
] |
2013-08-20
|
[
[
"Kopp",
"Joachim",
""
],
[
"Neil",
"Ethan T.",
""
],
[
"Primulando",
"Reinard",
""
],
[
"Zupan",
"Jure",
""
]
] |
We explore the relationship between astrophysical gamma-ray signals and LHC signatures for a class of phenomenologically successful secluded dark matter models, motivated by recent evidence for a ~130 GeV gamma-ray line. We consider in detail scenarios in which interactions between the dark sector and the standard model are mediated by a vev-less scalar field \phi, transforming as an N-plet (N > 3) under SU(2)_L. Since some of the component fields of \phi carry large electric charges, loop induced dark matter annihilation to \gamma \gamma and \gamma Z can be enhanced without the need for non-perturbatively large couplings, and without overproduction of continuum gamma-rays from other final states. We discuss prospects for other experimental tests, including dark matter-nucleon scattering and production of \phi at the LHC, where future searches for anomalous charged tracks may be sensitive. The first LHC hints could come from the Higgs sector, where loop corrections involving \phi lead to significantly modified h to \gamma \gamma and h to \gamma Z branching ratios.
|
hep-ph/0007229
|
Fritz W. Bopp
|
Fritz W. Bopp
|
Baryon Transport in Dual Models and the Possibility of a Backward Peak
in Diffraction
|
10 pages, 10 figures, presented at the conference Crimean Summer
School-Seminar, Yalta, May 27 - June 4, 2000
| null | null |
SI-00-7
|
hep-ph
| null |
We begin to briefly survey the experimental and conceptual side of baryon
transfers in particle scattering. A discussion of baryon transfers in heavy ion
scattering follows. It shortly reviews existing string model concepts, which
were found to be consistent with the data. With this motivation we turn to a
more careful consideration of the relevant topological structures. The baryon
transfer is associated with one of two possible cuts in baryonium exchange.
From the color structure the baryonium can be identified with an Odderon
exchange. We conjecture that the two Odderon cuts occur with an opposite sign
and partially cancel. As the Odderon is predicted to have a rather high
trajectory it has to involve small coupling constants. As this suppression is
not anticipated for diffractive processes a tiny observable backward peak is
argued to occur in the initial baryon distribution in massive diffractive
systems.
|
[
{
"created": "Thu, 20 Jul 2000 18:12:26 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Bopp",
"Fritz W.",
""
]
] |
We begin to briefly survey the experimental and conceptual side of baryon transfers in particle scattering. A discussion of baryon transfers in heavy ion scattering follows. It shortly reviews existing string model concepts, which were found to be consistent with the data. With this motivation we turn to a more careful consideration of the relevant topological structures. The baryon transfer is associated with one of two possible cuts in baryonium exchange. From the color structure the baryonium can be identified with an Odderon exchange. We conjecture that the two Odderon cuts occur with an opposite sign and partially cancel. As the Odderon is predicted to have a rather high trajectory it has to involve small coupling constants. As this suppression is not anticipated for diffractive processes a tiny observable backward peak is argued to occur in the initial baryon distribution in massive diffractive systems.
|
2004.01206
|
Marcel Golz
|
Rigo Bause, Hector Gisbert, Marcel Golz, Gudrun Hiller
|
Exploiting CP-asymmetries in rare charm decays
|
13 pages, 5 figures
|
Phys. Rev. D 101, 115006 (2020)
|
10.1103/PhysRevD.101.115006
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We analyze patterns from CP-violating new physics (NP) in hadronic and
semileptonic rare charm $\vert \Delta c \vert=\vert \Delta u\vert=1$
transitions. Observation of direct CP-violation in hadronic decays, as in
$\Delta A_{\text{CP}}$, provides opportunities for $c \to u \,\ell^+ \ell^-$,
$\ell=e,\mu$ transitions, and vice versa. For the concrete case of flavorful,
anomaly-free $Z^\prime$-models a NP-interpretation of $\Delta A_{\text{CP}}$
suggests measurable CP-asymmetries in semileptonic decays such as $D \to \pi\,
\ell^+ \ell^-$ or $D \to \pi \pi\, \ell^+ \ell^-$. Conversely, an observation
of CP-violation in $c \to u\, e^+ e^-$ or $c \to u\, \mu^+ \mu^-$ decays
supports a NP--interpretation of $\Delta A_{\text{CP}}$. Flavorful
$U(1)^\prime$-extensions provide explicit U--spin and isospin breaking which
can be probed in patterns of hadronic decays of charm mesons. We work out
signatures for CP-asymmetries in $D^0 \to \pi^+ \pi^-$, $D^0 \to K^+ K^-$ and
$D^0 \to \pi^0 \pi^0$, $D^+ \to \pi^+ \pi^0$ decays, which can be probed in the
future at LHCb and Belle II and provide further informative cross checks.
|
[
{
"created": "Thu, 2 Apr 2020 18:06:07 GMT",
"version": "v1"
}
] |
2020-07-01
|
[
[
"Bause",
"Rigo",
""
],
[
"Gisbert",
"Hector",
""
],
[
"Golz",
"Marcel",
""
],
[
"Hiller",
"Gudrun",
""
]
] |
We analyze patterns from CP-violating new physics (NP) in hadronic and semileptonic rare charm $\vert \Delta c \vert=\vert \Delta u\vert=1$ transitions. Observation of direct CP-violation in hadronic decays, as in $\Delta A_{\text{CP}}$, provides opportunities for $c \to u \,\ell^+ \ell^-$, $\ell=e,\mu$ transitions, and vice versa. For the concrete case of flavorful, anomaly-free $Z^\prime$-models a NP-interpretation of $\Delta A_{\text{CP}}$ suggests measurable CP-asymmetries in semileptonic decays such as $D \to \pi\, \ell^+ \ell^-$ or $D \to \pi \pi\, \ell^+ \ell^-$. Conversely, an observation of CP-violation in $c \to u\, e^+ e^-$ or $c \to u\, \mu^+ \mu^-$ decays supports a NP--interpretation of $\Delta A_{\text{CP}}$. Flavorful $U(1)^\prime$-extensions provide explicit U--spin and isospin breaking which can be probed in patterns of hadronic decays of charm mesons. We work out signatures for CP-asymmetries in $D^0 \to \pi^+ \pi^-$, $D^0 \to K^+ K^-$ and $D^0 \to \pi^0 \pi^0$, $D^+ \to \pi^+ \pi^0$ decays, which can be probed in the future at LHCb and Belle II and provide further informative cross checks.
|
hep-ph/9807426
|
Emilio Torrente Lujan
|
E. Torrente-Lujan
|
Solar Antineutrinos from Fluctuating Magnetic Fields at Kamiokande
|
10 pags. latex. 3 figures, 3 ps files. epsfig.sty neccesary. Version
with minor typo errors corrected
|
Phys.Lett. B441 (1998) 305-312
|
10.1016/S0370-2693(98)01166-6
|
IFIC-9833, FTUV-9833, UQbar-TH/98345
|
hep-ph
| null |
We consider the effect of a strongly chaotic magnetic field at the narrow
bottom of the convective zone of the Sun together with resonant matter
oscillations on the production of electron Majorana antineutrinos. Even for
moderate levels of noise, we show that it is possible to obtain a small but
significant probability for $\nu_e\to \bar{\nu}_e$ conversions (1-3%) at the
energy range 2-10 MeV for large regions of the mixing parameter space while
still satisfying present (Super)-Kamiokande antineutrino bounds and observed
total rates. In the other hand it would be possible to obtain information about
the solar magnetic internal field if antineutrino bounds reach the 1% level and
a particle physics solution to the SNP is assumed. The mechanism presented here
has the advantage of being independent of the largely unknown magnetic profile
of the Sun and the intrinsic neutrino magnetic moment.
|
[
{
"created": "Mon, 20 Jul 1998 19:13:43 GMT",
"version": "v1"
},
{
"created": "Fri, 31 Jul 1998 16:23:51 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Torrente-Lujan",
"E.",
""
]
] |
We consider the effect of a strongly chaotic magnetic field at the narrow bottom of the convective zone of the Sun together with resonant matter oscillations on the production of electron Majorana antineutrinos. Even for moderate levels of noise, we show that it is possible to obtain a small but significant probability for $\nu_e\to \bar{\nu}_e$ conversions (1-3%) at the energy range 2-10 MeV for large regions of the mixing parameter space while still satisfying present (Super)-Kamiokande antineutrino bounds and observed total rates. In the other hand it would be possible to obtain information about the solar magnetic internal field if antineutrino bounds reach the 1% level and a particle physics solution to the SNP is assumed. The mechanism presented here has the advantage of being independent of the largely unknown magnetic profile of the Sun and the intrinsic neutrino magnetic moment.
|
1309.7444
|
Volkan Ari
|
V. Ari, O. \c{C}akir, S. Kuday
|
Pair Production of New Heavy Leptons with $U(1)'$ Charge at Linear
Colliders
|
13 pages, 9 figures
| null |
10.1142/S0217751X14500559
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the pair production of new heavy leptons within a new $U(1)'$
symmetry extension of the Standard Model. Because of the new symmetry, the
production and decay modes of the new heavy leptons would be different from
those of three families of the standard model. The pair production cross
sections depending on the mixing parameter and the mass of heavy leptons have
been calculated for the center of mass energies of $0.5$ TeV, $1$ TeV and $3$
TeV. The accessible ranges of the parameters have been obtained for different
luminosity projections at linear colliders. We find the sensitivity to the
range of mixing parameter $-1<x<1$ for the mass range $M_{l'}<800$ GeV at
$\sqrt{s}=3$ TeV and $L_{int}=100$ fb$^{-1}$
|
[
{
"created": "Sat, 28 Sep 2013 10:18:03 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Dec 2013 13:10:16 GMT",
"version": "v2"
}
] |
2015-06-17
|
[
[
"Ari",
"V.",
""
],
[
"Çakir",
"O.",
""
],
[
"Kuday",
"S.",
""
]
] |
We study the pair production of new heavy leptons within a new $U(1)'$ symmetry extension of the Standard Model. Because of the new symmetry, the production and decay modes of the new heavy leptons would be different from those of three families of the standard model. The pair production cross sections depending on the mixing parameter and the mass of heavy leptons have been calculated for the center of mass energies of $0.5$ TeV, $1$ TeV and $3$ TeV. The accessible ranges of the parameters have been obtained for different luminosity projections at linear colliders. We find the sensitivity to the range of mixing parameter $-1<x<1$ for the mass range $M_{l'}<800$ GeV at $\sqrt{s}=3$ TeV and $L_{int}=100$ fb$^{-1}$
|
hep-ph/0612226
|
Qiang Zhao
|
Qiang Zhao
|
Charmonium hadronic decays and the OZI rule violation effects
|
Proceeding of the International Workshop on Tau-Charm Physics,
Beijing, China, June 5-7, 2006
|
Int.J.Mod.Phys. A21 (2006) 5529-5534
|
10.1142/S0217751X06034707
| null |
hep-ph
| null |
We discuss the scalar meson mixing scenario and present an OZI rule violation
mechanism for understanding the scalar productions in charmoium hadronic
decays. We stress that the OZI violation could play a key role in disentangling
the structure of the scalars: $f_0(1370)$, $f_0(1500)$ and $f_0(1710)$.
|
[
{
"created": "Tue, 19 Dec 2006 12:41:41 GMT",
"version": "v1"
}
] |
2009-11-11
|
[
[
"Zhao",
"Qiang",
""
]
] |
We discuss the scalar meson mixing scenario and present an OZI rule violation mechanism for understanding the scalar productions in charmoium hadronic decays. We stress that the OZI violation could play a key role in disentangling the structure of the scalars: $f_0(1370)$, $f_0(1500)$ and $f_0(1710)$.
|
1708.01259
|
David McKeen
|
Kyle Aitken, David McKeen, Ann E. Nelson, Thomas Neder
|
Baryogenesis from Oscillations of Charmed or Beautiful Baryons
|
15 pages, 6 figures
|
Phys. Rev. D 96, 075009 (2017)
|
10.1103/PhysRevD.96.075009
|
PITT-PACC-1709
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose a model for CP violating oscillations of neutral, heavy-flavored
baryons into antibaryons at rates which are within a few orders of magnitude of
their lifetimes. The flavor structure of the baryon violation suppresses
neutron oscillations and baryon number violating nuclear decays to
experimentally allowed rates. We also propose a scenario for producing such
baryons in the early Universe via the out-of-equilibrium decays of a neutral
particle, after hadronization but before nucleosynthesis. We find parameters
where CP violating baryon oscillations at a temperature of a few MeV could
result in the observed asymmetry between baryons and antibaryons. Furthermore,
part of the relevant parameter space for baryogenesis is potentially testable
at Belle II via decays of heavy flavor baryons into an exotic neutral fermion.
The model introduces four new particles: three light Majorana fermions and a
colored scalar. The lightest of these fermions is typically long lived on
collider timescales and may be produced in decays of bottom and possibly
charmed hadrons.
|
[
{
"created": "Thu, 3 Aug 2017 18:00:04 GMT",
"version": "v1"
}
] |
2017-10-18
|
[
[
"Aitken",
"Kyle",
""
],
[
"McKeen",
"David",
""
],
[
"Nelson",
"Ann E.",
""
],
[
"Neder",
"Thomas",
""
]
] |
We propose a model for CP violating oscillations of neutral, heavy-flavored baryons into antibaryons at rates which are within a few orders of magnitude of their lifetimes. The flavor structure of the baryon violation suppresses neutron oscillations and baryon number violating nuclear decays to experimentally allowed rates. We also propose a scenario for producing such baryons in the early Universe via the out-of-equilibrium decays of a neutral particle, after hadronization but before nucleosynthesis. We find parameters where CP violating baryon oscillations at a temperature of a few MeV could result in the observed asymmetry between baryons and antibaryons. Furthermore, part of the relevant parameter space for baryogenesis is potentially testable at Belle II via decays of heavy flavor baryons into an exotic neutral fermion. The model introduces four new particles: three light Majorana fermions and a colored scalar. The lightest of these fermions is typically long lived on collider timescales and may be produced in decays of bottom and possibly charmed hadrons.
|
hep-ph/9601340
|
Takeshi Kurimoto
|
Ciprian Dariescu and Marina-Aura Dariescu
|
Perturbative QCD analyses of the nonleptonic $B$ meson decays
|
13 pages, LaTeX format, figures not included
|
Phys.Lett. B378 (1996) 323-328
|
10.1016/0370-2693(96)00349-8
|
TOYAMA-87
|
hep-ph
| null |
Based on Brodsky-Lepage approach, the nonleptonic $B$ meson decay branching
ratio is derived in terms of three parameters and is geometrically analysed as
the 3-surface embedded in the 4-dimensional (abstract) Euclidean space
generated by the three parameters and $BR$. Investigating its 2-dimensional
sections, we find ranges for these parameters imposed by a comparison with
experimental data.
|
[
{
"created": "Fri, 26 Jan 1996 07:06:39 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Dariescu",
"Ciprian",
""
],
[
"Dariescu",
"Marina-Aura",
""
]
] |
Based on Brodsky-Lepage approach, the nonleptonic $B$ meson decay branching ratio is derived in terms of three parameters and is geometrically analysed as the 3-surface embedded in the 4-dimensional (abstract) Euclidean space generated by the three parameters and $BR$. Investigating its 2-dimensional sections, we find ranges for these parameters imposed by a comparison with experimental data.
|
2103.04319
|
Rene Poncelet
|
Herschel A. Chawdhry, Michal Czakon, Alexander Mitov, Rene Poncelet
|
Two-loop leading-colour QCD helicity amplitudes for two-photon plus jet
production at the LHC
|
13 pages, 1 figure, 3 tables, published version
| null |
10.1007/JHEP07(2021)164
|
OUTP-21-06P, Cavendish-HEP-21/05, P3H-21-014, TTK-21-09
|
hep-ph hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
We calculate the complete set of two-loop leading-colour QCD helicity
amplitudes for $\gamma \gamma j$-production at hadron colliders. Our results
are presented in a compact, fully-analytical form.
|
[
{
"created": "Sun, 7 Mar 2021 10:55:27 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Aug 2021 08:03:38 GMT",
"version": "v2"
}
] |
2021-08-25
|
[
[
"Chawdhry",
"Herschel A.",
""
],
[
"Czakon",
"Michal",
""
],
[
"Mitov",
"Alexander",
""
],
[
"Poncelet",
"Rene",
""
]
] |
We calculate the complete set of two-loop leading-colour QCD helicity amplitudes for $\gamma \gamma j$-production at hadron colliders. Our results are presented in a compact, fully-analytical form.
|
hep-ph/9811427
|
Gerald Cleaver
|
G.B. Cleaver, A.E. Faraggi and D.V. Nanopoulos
|
String derived MSSM and M-theory Unification
|
18 pages. Standard Latex. Version to appear in PLB
|
Phys.Lett.B455:135-146,1999
|
10.1016/S0370-2693(99)00413-X
|
ACT-11/98, CTP-TAMU-45/98, TPI-MINN-98/24, UMN-TH-1729-98
|
hep-ph astro-ph hep-th
| null |
The recent conjecture of possible equivalence between the string scale $M_S$
and the minimal supersymmetric standard model unification scale M_U ~ 2.5 x
10^{16} GeV is considered in the context of string models. This conjecture
suggests that the observable gauge group just below the string scale should be
SU(3)_C x SU(2)_L x U(1)_Y and that the SU(3)_C x SU(2)_L x U(1)_Y-charged
spectrum of the observable sector should consist solely of the MSSM spectrum.
We demonstrate that string models can actually be constructed that possess
these observable features. Two aspects generic to many classes of three family
SU(3)_C x SU(2)_L x U(1)_Y string models are both an extra local anomalous
U(1)_A and numerous (often fractionally charged) exotic particles beyond the
MSSM. Thus, for these classes, the key to obtaining an M_S = M_U ~ 2.5 x
10^{16} GeV string model is the existence of F- and D-flat directions that near
the string scale can simultaneously break the anomalous U(1) and give mass to
all exotic SM-charged observable particles, decoupling them from the low energy
spectrum. In this letter we show, in the context of free fermionic strings,
that string models with flat directions possessing these features do exist. We
present one such string derived model in which all such exotic observable
states beyond the MSSM receive mass at the scale generated by the Fayet-
Iliopoulos term. The associated F- and D-flat direction is proven flat to all
orders of the superpotential.
|
[
{
"created": "Sat, 21 Nov 1998 00:22:22 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Nov 1998 00:17:12 GMT",
"version": "v2"
},
{
"created": "Mon, 5 Apr 1999 16:51:45 GMT",
"version": "v3"
}
] |
2010-04-06
|
[
[
"Cleaver",
"G. B.",
""
],
[
"Faraggi",
"A. E.",
""
],
[
"Nanopoulos",
"D. V.",
""
]
] |
The recent conjecture of possible equivalence between the string scale $M_S$ and the minimal supersymmetric standard model unification scale M_U ~ 2.5 x 10^{16} GeV is considered in the context of string models. This conjecture suggests that the observable gauge group just below the string scale should be SU(3)_C x SU(2)_L x U(1)_Y and that the SU(3)_C x SU(2)_L x U(1)_Y-charged spectrum of the observable sector should consist solely of the MSSM spectrum. We demonstrate that string models can actually be constructed that possess these observable features. Two aspects generic to many classes of three family SU(3)_C x SU(2)_L x U(1)_Y string models are both an extra local anomalous U(1)_A and numerous (often fractionally charged) exotic particles beyond the MSSM. Thus, for these classes, the key to obtaining an M_S = M_U ~ 2.5 x 10^{16} GeV string model is the existence of F- and D-flat directions that near the string scale can simultaneously break the anomalous U(1) and give mass to all exotic SM-charged observable particles, decoupling them from the low energy spectrum. In this letter we show, in the context of free fermionic strings, that string models with flat directions possessing these features do exist. We present one such string derived model in which all such exotic observable states beyond the MSSM receive mass at the scale generated by the Fayet- Iliopoulos term. The associated F- and D-flat direction is proven flat to all orders of the superpotential.
|
0912.4917
|
Olexandr Novak
|
O. P. Novak, R. I. Kholodov
|
Spin-polarization effects in the processes of synchrotron radiation and
electron-positron pair production by a photon in a magnetic field
|
RevTeX, 12 pages, 8 figures, published in Physical Review D
|
Phys.Rev.D80:025025,2009
|
10.1103/PhysRevD.80.025025
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Spin and polarization effects and correlations between them in the processes
of pair production by a photon and synchrotron radiation in a magnetic field
are considered. Expressions for the probabilities of the processes with
arbitrary polarizations of the particles are obtained. These expressions are
analyzed in detail in both the lowest Landau levels and ultrarelativistic
approximations.
|
[
{
"created": "Thu, 24 Dec 2009 21:14:14 GMT",
"version": "v1"
}
] |
2010-04-23
|
[
[
"Novak",
"O. P.",
""
],
[
"Kholodov",
"R. I.",
""
]
] |
Spin and polarization effects and correlations between them in the processes of pair production by a photon and synchrotron radiation in a magnetic field are considered. Expressions for the probabilities of the processes with arbitrary polarizations of the particles are obtained. These expressions are analyzed in detail in both the lowest Landau levels and ultrarelativistic approximations.
|
hep-ph/0011084
|
Maarten F. L. Golterman
|
Maarten Golterman (Washington U.)
|
Chiral Perturbation Theory, Non-leptonic Kaon Decays, and the Lattice
|
13 pages, invited plenary talk at Chiral 2000, Jefferson Lab., July
17-22, 2000
| null |
10.1142/9789812810977_0003
| null |
hep-ph hep-lat
| null |
In this talk, I first motivate the use of Chiral Perturbation Theory in the
context of Lattice QCD. In particular, I explain how partially quenched QCD,
which has, in general, unequal valence- and sea-quark masses, can be used to
obtain real-world (i.e. unquenched) results for low-energy constants. In the
second part, I review how Chiral Perturbation Theory may be used to overcome
theoretical difficulties which afflict the computation of non-leptonic kaon
decay rates from Lattice QCD. I argue that it should be possible to determine
at least the O(p^2) weak low-energy constants reliably from numerical
computations of the K to pi and K to vacuum matrix elements of the
corresponding weak operators.
|
[
{
"created": "Mon, 6 Nov 2000 23:32:56 GMT",
"version": "v1"
}
] |
2017-08-23
|
[
[
"Golterman",
"Maarten",
"",
"Washington U."
]
] |
In this talk, I first motivate the use of Chiral Perturbation Theory in the context of Lattice QCD. In particular, I explain how partially quenched QCD, which has, in general, unequal valence- and sea-quark masses, can be used to obtain real-world (i.e. unquenched) results for low-energy constants. In the second part, I review how Chiral Perturbation Theory may be used to overcome theoretical difficulties which afflict the computation of non-leptonic kaon decay rates from Lattice QCD. I argue that it should be possible to determine at least the O(p^2) weak low-energy constants reliably from numerical computations of the K to pi and K to vacuum matrix elements of the corresponding weak operators.
|
1708.02243
|
Hou Keong Lou
|
Simon Knapen, Hou Keong Lou, Michele Papucci, Jack Setford
|
Tracking down Quirks at the Large Hadron Collider
|
9 pages, 10 figures, submitted to PRD, minor changes
|
Phys. Rev. D 96, 115015 (2017)
|
10.1103/PhysRevD.96.115015
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Non-helical tracks are the smoking gun signature of charged and/or colored
quirks, which are pairs of particles bound by a new, long-range confining
force. We propose a method to efficiently search for these non-helical tracks
at the LHC, without the need to fit their trajectories. We show that the hits
corresponding to quirky trajectories can be selected efficiently by searching
for co-planar hits in the inner layers of the ATLAS and CMS trackers, even in
the presence of on average 50 pile-up vertices. We further argue that
backgrounds from photon conversions and unassociated pile-up hits can be
removed almost entirely, while maintaining a signal reconstruction efficiency
as high as 70%. With the 300 fb$^{-1}$ dataset, this implies a discovery
potential for string tension between 100 eV and 30 keV, and colored
(electroweak charged) quirks as heavy as 1600 (650) GeV may be discovered.
|
[
{
"created": "Mon, 7 Aug 2017 18:00:00 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Nov 2017 19:30:49 GMT",
"version": "v2"
}
] |
2017-12-27
|
[
[
"Knapen",
"Simon",
""
],
[
"Lou",
"Hou Keong",
""
],
[
"Papucci",
"Michele",
""
],
[
"Setford",
"Jack",
""
]
] |
Non-helical tracks are the smoking gun signature of charged and/or colored quirks, which are pairs of particles bound by a new, long-range confining force. We propose a method to efficiently search for these non-helical tracks at the LHC, without the need to fit their trajectories. We show that the hits corresponding to quirky trajectories can be selected efficiently by searching for co-planar hits in the inner layers of the ATLAS and CMS trackers, even in the presence of on average 50 pile-up vertices. We further argue that backgrounds from photon conversions and unassociated pile-up hits can be removed almost entirely, while maintaining a signal reconstruction efficiency as high as 70%. With the 300 fb$^{-1}$ dataset, this implies a discovery potential for string tension between 100 eV and 30 keV, and colored (electroweak charged) quirks as heavy as 1600 (650) GeV may be discovered.
|
1409.7816
|
Danny van Dyk
|
I. Sentitemsu Imsong, Alexander Khodjamirian, Thomas Mannel, Danny van
Dyk (Siegen U.)
|
Extrapolation and unitarity bounds for the $B \to \pi$ form factor
|
26 pages, 4 figures; v2: as published (reference and zoomed plot
added, conclusions and numerics unchanged)
|
JHEP02(2015)126
|
10.1007/JHEP02(2015)126
|
SI-HEP-2014-21, QFET-2014-14, EOS-2014-02
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We address the problem of extrapolating the vector form factor $f_{B\pi}^+$,
which is relevant to $B\to \pi\ell \nu_\ell$ decays, from the region of small
to the region of large momentum transfer. As input, we use the QCD light-cone
sum rule at small momentum transfer. We carry out a comprehensive Bayesian
uncertainty analysis and obtain correlated uncertainties for the normalization
and shape parameters of the form factor. The $z$-series parametrization for
$f_{B\pi}^+$ is employed to extrapolate our results to large momentum transfer,
and to compare with the lattice QCD results. To test the validity of our
extrapolation we use the upper and lower bounds from the unitarity and
positivity of the two-point correlator of heavy-light quark currents. This
correlator is updated by including the NNLO perturbative term and the NLO
correction to the quark condensate contribution. We demonstrate that an
additional input including the form factor, its first and second derivative
calculated at one value of momentum transfer from the light-cone sum rules,
considerably improves the bounds. This only holds when the correlations between
the form factor parameters are taken into account. We further combine our
results with the latest experimental measurements of $B\to \pi \ell \nu_\ell$
by the BaBar and Belle collaborations, and obtain $|V_{ub}|=
(3.32^{+0.26}_{-0.22}) \cdot 10^{-3}$ from a Bayesian analysis.
|
[
{
"created": "Sat, 27 Sep 2014 15:20:03 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Mar 2015 09:59:40 GMT",
"version": "v2"
}
] |
2015-03-06
|
[
[
"Imsong",
"I. Sentitemsu",
"",
"Siegen U."
],
[
"Khodjamirian",
"Alexander",
"",
"Siegen U."
],
[
"Mannel",
"Thomas",
"",
"Siegen U."
],
[
"van Dyk",
"Danny",
"",
"Siegen U."
]
] |
We address the problem of extrapolating the vector form factor $f_{B\pi}^+$, which is relevant to $B\to \pi\ell \nu_\ell$ decays, from the region of small to the region of large momentum transfer. As input, we use the QCD light-cone sum rule at small momentum transfer. We carry out a comprehensive Bayesian uncertainty analysis and obtain correlated uncertainties for the normalization and shape parameters of the form factor. The $z$-series parametrization for $f_{B\pi}^+$ is employed to extrapolate our results to large momentum transfer, and to compare with the lattice QCD results. To test the validity of our extrapolation we use the upper and lower bounds from the unitarity and positivity of the two-point correlator of heavy-light quark currents. This correlator is updated by including the NNLO perturbative term and the NLO correction to the quark condensate contribution. We demonstrate that an additional input including the form factor, its first and second derivative calculated at one value of momentum transfer from the light-cone sum rules, considerably improves the bounds. This only holds when the correlations between the form factor parameters are taken into account. We further combine our results with the latest experimental measurements of $B\to \pi \ell \nu_\ell$ by the BaBar and Belle collaborations, and obtain $|V_{ub}|= (3.32^{+0.26}_{-0.22}) \cdot 10^{-3}$ from a Bayesian analysis.
|
hep-ph/0003229
|
Uma Mahanta
|
Uma Mahanta
|
Higgs induced light leptoquark-diquark mixing and proton decay
|
Plain Tex, 8 pages no figures
|
Eur.Phys.J.C16:367-369,2000
|
10.1007/s100520050029
| null |
hep-ph
| null |
In low energy phenomenology to avoid the strong constraints of proton decay
it is usually assumed that light ($\approx $ 250 Gev) leptoquarks couple only
to quark-lepton pairs and light diquarks couple only to quark pairs. In this
paper we present two specific examples where the higgs induced mixing between
leptoquarks and diquarks through trilinear interaction terms reintroduces the
troublesome couplings and gives rise to proton decay. The bound on the unknown
parameters of this scenario that arise from proton life time has been derived.
|
[
{
"created": "Thu, 23 Mar 2000 11:57:16 GMT",
"version": "v1"
}
] |
2011-09-13
|
[
[
"Mahanta",
"Uma",
""
]
] |
In low energy phenomenology to avoid the strong constraints of proton decay it is usually assumed that light ($\approx $ 250 Gev) leptoquarks couple only to quark-lepton pairs and light diquarks couple only to quark pairs. In this paper we present two specific examples where the higgs induced mixing between leptoquarks and diquarks through trilinear interaction terms reintroduces the troublesome couplings and gives rise to proton decay. The bound on the unknown parameters of this scenario that arise from proton life time has been derived.
|
1501.01296
|
Sandra Robles
|
D.G. Cerdeno, M. Peiro, and S. Robles
|
Fits to the Fermi-LAT GeV excess with RH sneutrino dark matter:
implications for direct and indirect dark matter searches and the LHC
|
13 pages, 9 figures, 1 table. Discussion extended, matches Phys. Rev.
D published version
|
Phys. Rev. D 91, 123530 (2015)
|
10.1103/PhysRevD.91.123530
|
IPPP/15/01, DCTP/15/02, IFT-UAM/CSIC-15-001, FTUAM-15-1
|
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show that the right-handed (RH) sneutrino in the NMSSM can account for the
observed excess in the Fermi-LAT spectrum of gamma rays from the Galactic
Centre, while fulfilling all the current experimental constraints from the LHC
as well as from direct and indirect dark matter searches. We have explored the
parameter space of this scenario, computed the gamma ray spectrum for each
phenomenologically viable solution and then performed a chi^2 fit to the
excess. Unlike previous studies based on model independent interpretations, we
have taken into account the full annihilation spectrum, without assuming pure
annihilation channels. Furthermore, we have incorporated limits from direct
detection experiments, LHC bounds and also the constraints from Fermi-LAT on
dwarf spheroidal galaxies (dSphs) and gamma ray spectral lines. In addition, we
have estimated the effect of the most recent Fermi-LAT reprocessed data (Pass
8). In general, we obtain good fits to the GCE when the RH sneutrino
annihilates mainly into pairs of light singlet-like scalar or pseudoscalar
Higgs bosons that subsequently decay in flight, producing four-body final
states and spectral features that improve the goodness of the fit at large
energies. The best fit (chi^2=20.8) corresponds to a RH sneutrino with a mass
of 64 GeV which annihilates preferentially into a pair of light singlet-like
pseudoscalar Higgs bosons (with masses of order 60 GeV). Besides, we have
analysed other channels that also provide good fits to the excess. Finally, we
discuss the implications for direct and indirect detection searches paying
special attention to the possible appearance of gamma ray spectral features in
near future Fermi-LAT analyses, as well as deviations from the SM-like Higgs
properties at the LHC. Remarkably, many of the scenarios that fit the GCE can
also be probed by these other complementary techniques.
|
[
{
"created": "Tue, 6 Jan 2015 20:52:52 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Jan 2015 16:11:08 GMT",
"version": "v2"
},
{
"created": "Fri, 31 Jul 2015 19:07:34 GMT",
"version": "v3"
}
] |
2015-08-03
|
[
[
"Cerdeno",
"D. G.",
""
],
[
"Peiro",
"M.",
""
],
[
"Robles",
"S.",
""
]
] |
We show that the right-handed (RH) sneutrino in the NMSSM can account for the observed excess in the Fermi-LAT spectrum of gamma rays from the Galactic Centre, while fulfilling all the current experimental constraints from the LHC as well as from direct and indirect dark matter searches. We have explored the parameter space of this scenario, computed the gamma ray spectrum for each phenomenologically viable solution and then performed a chi^2 fit to the excess. Unlike previous studies based on model independent interpretations, we have taken into account the full annihilation spectrum, without assuming pure annihilation channels. Furthermore, we have incorporated limits from direct detection experiments, LHC bounds and also the constraints from Fermi-LAT on dwarf spheroidal galaxies (dSphs) and gamma ray spectral lines. In addition, we have estimated the effect of the most recent Fermi-LAT reprocessed data (Pass 8). In general, we obtain good fits to the GCE when the RH sneutrino annihilates mainly into pairs of light singlet-like scalar or pseudoscalar Higgs bosons that subsequently decay in flight, producing four-body final states and spectral features that improve the goodness of the fit at large energies. The best fit (chi^2=20.8) corresponds to a RH sneutrino with a mass of 64 GeV which annihilates preferentially into a pair of light singlet-like pseudoscalar Higgs bosons (with masses of order 60 GeV). Besides, we have analysed other channels that also provide good fits to the excess. Finally, we discuss the implications for direct and indirect detection searches paying special attention to the possible appearance of gamma ray spectral features in near future Fermi-LAT analyses, as well as deviations from the SM-like Higgs properties at the LHC. Remarkably, many of the scenarios that fit the GCE can also be probed by these other complementary techniques.
|
hep-ph/0212097
|
David A. Kosower
|
David A. Kosower
|
Multiple Singular Emission in Gauge Theories
|
Corrections for final journal version (sign in eqn. (6.11), equation
references, typos in indices) & removal of comment about FDH
|
Phys.Rev. D67 (2003) 116003
|
10.1103/PhysRevD.67.116003
|
Saclay/SPhT-T02/174
|
hep-ph
| null |
I derive a class of functions unifying all singular limits for the emission
of a given number of soft or collinear gluons in tree-level gauge-theory
amplitudes. Each function is a generalization of the single-emission antenna
function of ref. [1]. The helicity-summed squares of these functions are thus
also generalizations to multiple singular emission of the Catani--Seymour
dipole factorization function.
|
[
{
"created": "Fri, 6 Dec 2002 11:06:16 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Dec 2003 17:55:46 GMT",
"version": "v2"
}
] |
2009-11-07
|
[
[
"Kosower",
"David A.",
""
]
] |
I derive a class of functions unifying all singular limits for the emission of a given number of soft or collinear gluons in tree-level gauge-theory amplitudes. Each function is a generalization of the single-emission antenna function of ref. [1]. The helicity-summed squares of these functions are thus also generalizations to multiple singular emission of the Catani--Seymour dipole factorization function.
|
hep-ph/0507046
|
Jae Sik Lee
|
John Ellis, Jae Sik Lee and Apostolos Pilaftsis
|
Resonant CP Violation in Higgs Radiation at e^+e^- Linear Collider
|
22 pages, 8 figures, to appear in Phys. Rev. D
|
Phys.Rev.D72:095006,2005
|
10.1103/PhysRevD.72.095006
|
CERN-PH-TH/2005-112
|
hep-ph
| null |
We study resonant CP violation in the Higgsstrahlung process e^+e^- ->
H_{1,2,3} (Z -> e^+e^-, \mu^+\mu^-) and subsequent decays H_{1,2,3} -> b
\bar{b}, \tau^-\tau^+, in the MSSM with Higgs-sector CP violation induced by
radiative corrections. At a high-energy e^+e^- linear collider, the recoil-mass
method enables one to determine the invariant mass of a fermion pair produced
by Higgs decays with a precision as good as 1 GeV. Assuming an integrated
luminosity of 100/fb, we show that the production lineshape of a coupled system
of neutral Higgs bosons decaying into b\bar{b} quarks is sensitive to the
CP-violating parameters. When the Higgs bosons decay into \tau^-\tau^+, two CP
asymmetries can be defined using the longitudinal and transverse polarizations
of the tau leptons. Taking into account the constraints from electric dipole
moments, we find that these CP asymmetries can be as large as 80 %, in a
tri-mixing scenario where all three neutral Higgs states of the MSSM are nearly
degenerate and mix significantly.
|
[
{
"created": "Mon, 4 Jul 2005 19:55:52 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Oct 2005 14:07:11 GMT",
"version": "v2"
}
] |
2009-09-11
|
[
[
"Ellis",
"John",
""
],
[
"Lee",
"Jae Sik",
""
],
[
"Pilaftsis",
"Apostolos",
""
]
] |
We study resonant CP violation in the Higgsstrahlung process e^+e^- -> H_{1,2,3} (Z -> e^+e^-, \mu^+\mu^-) and subsequent decays H_{1,2,3} -> b \bar{b}, \tau^-\tau^+, in the MSSM with Higgs-sector CP violation induced by radiative corrections. At a high-energy e^+e^- linear collider, the recoil-mass method enables one to determine the invariant mass of a fermion pair produced by Higgs decays with a precision as good as 1 GeV. Assuming an integrated luminosity of 100/fb, we show that the production lineshape of a coupled system of neutral Higgs bosons decaying into b\bar{b} quarks is sensitive to the CP-violating parameters. When the Higgs bosons decay into \tau^-\tau^+, two CP asymmetries can be defined using the longitudinal and transverse polarizations of the tau leptons. Taking into account the constraints from electric dipole moments, we find that these CP asymmetries can be as large as 80 %, in a tri-mixing scenario where all three neutral Higgs states of the MSSM are nearly degenerate and mix significantly.
|
1406.2972
|
Felix Karbstein
|
Holger Gies, Felix Karbstein, Rashid Shaisultanov
|
Laser photon merging in an electromagnetic field inhomogeneity
|
28 pages, 6 figures; some clarifications added, matches journal
version
|
Phys. Rev. D 90, 033007 (2014)
|
10.1103/PhysRevD.90.033007
| null |
hep-ph quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the effect of laser photon merging, or equivalently high harmonic
generation, in the quantum vacuum subject to inhomogeneous electromagnetic
fields. Such a process is facilitated by the effective nonlinear couplings
arising from charged particle-antiparticle fluctuations in the quantum vacuum
subject to strong electromagnetic fields. We derive explicit results for
general kinematic and polarization configurations involving optical photons.
Concentrating on merged photons in reflected channels which are preferable in
experiments for reasons of noise suppression, we demonstrate that photon
merging is typically dominated by the competing nonlinear process of quantum
reflection, though appropriate polarization and signal filtering could
specifically search for the merging process. As a byproduct, we devise a novel
systematic expansion of the photon polarization tensor in plane wave fields.
|
[
{
"created": "Wed, 11 Jun 2014 17:23:01 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Aug 2014 09:49:04 GMT",
"version": "v2"
}
] |
2014-08-14
|
[
[
"Gies",
"Holger",
""
],
[
"Karbstein",
"Felix",
""
],
[
"Shaisultanov",
"Rashid",
""
]
] |
We study the effect of laser photon merging, or equivalently high harmonic generation, in the quantum vacuum subject to inhomogeneous electromagnetic fields. Such a process is facilitated by the effective nonlinear couplings arising from charged particle-antiparticle fluctuations in the quantum vacuum subject to strong electromagnetic fields. We derive explicit results for general kinematic and polarization configurations involving optical photons. Concentrating on merged photons in reflected channels which are preferable in experiments for reasons of noise suppression, we demonstrate that photon merging is typically dominated by the competing nonlinear process of quantum reflection, though appropriate polarization and signal filtering could specifically search for the merging process. As a byproduct, we devise a novel systematic expansion of the photon polarization tensor in plane wave fields.
|
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