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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1409.3661
|
I-chin Wang
|
Guo-Chin Liu and Kin-Wang Ng and I-Chin Wang
|
Naturally large tensor-to-scalar ratio in inflation
|
6 pages, 3 figures
|
Phys.Rev.D 90, 103531(2014)
|
10.1103/PhysRevD.90.103531
| null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recently, BICEP2 measurements of the cosmic microwave background (CMB)
$B$-mode polarization at degree angular scales has indicated the presence of
tensor modes with a high tensor-to-scalar ratio of $r=0.2$ when assuming nearly
scale-invariant tensor and scalar spectra, although the signal may be
contaminated by dust emission as implied by the recent {\em Planck}
polarization data. This result is in conflict with the {\em Planck} best-fit
Lambda Cold Dark Model with $r<0.11$. Due to the fact that inflaton has to be
interacting with other fields so as to convert its potential energy into
radiation to reheat the Universe, the interacting inflaton may result in a
suppression of the scalar spectrum at large scales. This suppression has been
used to explain the observed low quadrupole in the CMB anisotropy. In this
paper, we show that a combination of the tensor modes measured by BICEP2 and
the large-scale suppressed scalar modes contributes to the CMB anisotropy in
such a way that the resultant CMB anisotropy and polarization power spectra are
consistent with both {\em Planck} and BICEP2 data. We also project our findings
to cases in which $r$ may become reduced in future CMB polarization
measurements.
|
[
{
"created": "Fri, 12 Sep 2014 07:23:38 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Oct 2014 08:48:28 GMT",
"version": "v2"
}
] |
2015-06-22
|
[
[
"Liu",
"Guo-Chin",
""
],
[
"Ng",
"Kin-Wang",
""
],
[
"Wang",
"I-Chin",
""
]
] |
Recently, BICEP2 measurements of the cosmic microwave background (CMB) $B$-mode polarization at degree angular scales has indicated the presence of tensor modes with a high tensor-to-scalar ratio of $r=0.2$ when assuming nearly scale-invariant tensor and scalar spectra, although the signal may be contaminated by dust emission as implied by the recent {\em Planck} polarization data. This result is in conflict with the {\em Planck} best-fit Lambda Cold Dark Model with $r<0.11$. Due to the fact that inflaton has to be interacting with other fields so as to convert its potential energy into radiation to reheat the Universe, the interacting inflaton may result in a suppression of the scalar spectrum at large scales. This suppression has been used to explain the observed low quadrupole in the CMB anisotropy. In this paper, we show that a combination of the tensor modes measured by BICEP2 and the large-scale suppressed scalar modes contributes to the CMB anisotropy in such a way that the resultant CMB anisotropy and polarization power spectra are consistent with both {\em Planck} and BICEP2 data. We also project our findings to cases in which $r$ may become reduced in future CMB polarization measurements.
|
1608.07500
|
Ahmed Hammad
|
W. Abdallah, A. Hammad, S. Khalil, S. Moretti
|
Search for Mono-Higgs Signals at the LHC in the B-L Supersymmetric
Standard Model
|
16 pages and 7 figures
|
Phys. Rev. D 95, 055019 (2017)
|
10.1103/PhysRevD.95.055019
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study mono-Higgs signatures emerging in the $B-L$ supersymmetric standard
model induced by new channels not present in the minimal supersymmetric
standard model, i.e., via topologies in which the mediator is either a heavy
$Z'$, with mass of ${\cal O}(2~{\rm TeV})$, or an intermediate $h'$ (the
lightest CP-even Higgs state of $B-L$ origin), with mass of ${\cal O}(0.2~{\rm
TeV})$. The mono-Higgs probe considered is the SM-like Higgs state recently
discovered at the large hadron collider, so as to enforce its mass
reconstruction for background reduction purposes. With this in mind, its two
cleanest signatures are selected: $\gamma\gamma$ and $ZZ^*\to 4l$ ($l=e,~\mu$).
We show how both of these can be accessed with foreseen energy and luminosity
options using a dedicated kinematic analysis performed in presence of partonic,
showering, hadronisation and detector effects.
|
[
{
"created": "Fri, 26 Aug 2016 16:03:49 GMT",
"version": "v1"
}
] |
2017-03-29
|
[
[
"Abdallah",
"W.",
""
],
[
"Hammad",
"A.",
""
],
[
"Khalil",
"S.",
""
],
[
"Moretti",
"S.",
""
]
] |
We study mono-Higgs signatures emerging in the $B-L$ supersymmetric standard model induced by new channels not present in the minimal supersymmetric standard model, i.e., via topologies in which the mediator is either a heavy $Z'$, with mass of ${\cal O}(2~{\rm TeV})$, or an intermediate $h'$ (the lightest CP-even Higgs state of $B-L$ origin), with mass of ${\cal O}(0.2~{\rm TeV})$. The mono-Higgs probe considered is the SM-like Higgs state recently discovered at the large hadron collider, so as to enforce its mass reconstruction for background reduction purposes. With this in mind, its two cleanest signatures are selected: $\gamma\gamma$ and $ZZ^*\to 4l$ ($l=e,~\mu$). We show how both of these can be accessed with foreseen energy and luminosity options using a dedicated kinematic analysis performed in presence of partonic, showering, hadronisation and detector effects.
|
hep-ph/9304276
|
Ed Stoeffhaas
|
M.B. Gay Ducati, F. Halzen, and A.A. Natale
|
Diffraction and the Gluon Mass
|
10 pages, Latex, 3 figures available by fax or conventional mail.
MAD/PH/750
|
Phys.Rev.D48:2324-2328,1993
|
10.1103/PhysRevD.48.2324
| null |
hep-ph
| null |
We recently proposed a QCD-Pomeron described by the exchange of two
non-perturbative gluons characterized by a dynamically generated gluon mass. It
is here shown that data on elastic scattering, exclusive $\rho$ production in
deep inelastic scattering and the $J/\Psi$-nucleon total cross-section can be
successfully described in terms of a single gluon mass $m_g\simeq0.37$~GeV. We
observe that the total cross sections of hadrons with small radii, such as
$J/\Psi$, have a marked dependence on the effective gluon mass.
|
[
{
"created": "Tue, 20 Apr 1993 15:52:30 GMT",
"version": "v1"
}
] |
2011-07-19
|
[
[
"Ducati",
"M. B. Gay",
""
],
[
"Halzen",
"F.",
""
],
[
"Natale",
"A. A.",
""
]
] |
We recently proposed a QCD-Pomeron described by the exchange of two non-perturbative gluons characterized by a dynamically generated gluon mass. It is here shown that data on elastic scattering, exclusive $\rho$ production in deep inelastic scattering and the $J/\Psi$-nucleon total cross-section can be successfully described in terms of a single gluon mass $m_g\simeq0.37$~GeV. We observe that the total cross sections of hadrons with small radii, such as $J/\Psi$, have a marked dependence on the effective gluon mass.
|
2004.13568
|
Qi-Fang L\"u
|
Wei Liang and Qi-Fang L\"u
|
The newly observed $\Lambda_b(6072)^0$ structure and its $\rho-$mode
nonstrange partners
|
8 pages, 4 figures, comments and suggestions are welcome
| null |
10.1140/epjc/s10052-020-8274-2
| null |
hep-ph hep-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Inspired by the newly observed $\Lambda_b(6072)$ structure, we investigate
its strong decay behaviors under various assignments within the $^3P_0$ model.
Compared with the mass and total decay width, our results suggest that the
$\Lambda_b(6072)$ can be regarded as the lowest $\rho-$mode excitation in
$\Lambda_b$ family. Then, the strong decays of $\rho-$mode nonstrange partners
for the $\Lambda_b(6072)$ are calculated. It is found that the $J^P=5/2^-$
$\Lambda_b$ and $\Lambda_c$ states are relatively narrow, and mainly decay into
the $\Sigma_b^{(*)} \pi$ and $\Sigma_c^{(*)} \pi$ final states, respectively.
These two states have good potentials to be observed in future experiments,
which may help us to distinguish the three-quark model and diquark model.
|
[
{
"created": "Tue, 28 Apr 2020 14:45:38 GMT",
"version": "v1"
}
] |
2020-08-26
|
[
[
"Liang",
"Wei",
""
],
[
"Lü",
"Qi-Fang",
""
]
] |
Inspired by the newly observed $\Lambda_b(6072)$ structure, we investigate its strong decay behaviors under various assignments within the $^3P_0$ model. Compared with the mass and total decay width, our results suggest that the $\Lambda_b(6072)$ can be regarded as the lowest $\rho-$mode excitation in $\Lambda_b$ family. Then, the strong decays of $\rho-$mode nonstrange partners for the $\Lambda_b(6072)$ are calculated. It is found that the $J^P=5/2^-$ $\Lambda_b$ and $\Lambda_c$ states are relatively narrow, and mainly decay into the $\Sigma_b^{(*)} \pi$ and $\Sigma_c^{(*)} \pi$ final states, respectively. These two states have good potentials to be observed in future experiments, which may help us to distinguish the three-quark model and diquark model.
|
hep-ph/0407320
|
Miguel Sanchis
|
Miguel A. Sanchis-Lozano
|
Hints of new physics in bottomonium decays and spectroscopy
|
4 pages, 3 EPS figures, Talk given at BEACH 2004, 27/6/04 - 3/7/04
IIT Chicago
| null |
10.1016/j.nuclphysbps.2005.01.034
|
IFIC/04-42, FTUV-04-0728
|
hep-ph
| null |
A non-standard light CP-odd Higgs boson could induce a slight (but
observable) lepton universality breakdown in Upsilon leptonic decays. Moreover,
the mixing between such a pseudoscalar Higgs and $\eta_b$ states might shift
the mass levels of the latter, thereby changing the values of the
$m_{\Upsilon(nS)}-m_{\eta_b(nS)}$ splittings predicted in the standard model.
Besides, also the $\eta_b$ width could be broader than expected, with
potentially negative consequences for its discovery in both $e^+e^-$ and hadron
colliders.
|
[
{
"created": "Wed, 28 Jul 2004 10:47:40 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Aug 2004 15:50:45 GMT",
"version": "v2"
},
{
"created": "Tue, 9 Nov 2004 13:07:13 GMT",
"version": "v3"
}
] |
2009-11-10
|
[
[
"Sanchis-Lozano",
"Miguel A.",
""
]
] |
A non-standard light CP-odd Higgs boson could induce a slight (but observable) lepton universality breakdown in Upsilon leptonic decays. Moreover, the mixing between such a pseudoscalar Higgs and $\eta_b$ states might shift the mass levels of the latter, thereby changing the values of the $m_{\Upsilon(nS)}-m_{\eta_b(nS)}$ splittings predicted in the standard model. Besides, also the $\eta_b$ width could be broader than expected, with potentially negative consequences for its discovery in both $e^+e^-$ and hadron colliders.
|
2103.09829
|
Marvin Zanke
|
Marvin Zanke, Martin Hoferichter, Bastian Kubis
|
On the transition form factors of the axial-vector resonance $f_1(1285)$
and its decay into $e^+e^-$
|
60 pages, 14 figures; v2: Appendix D on alternative $f_1 \to 4\pi$
mechanism added, references updated, version published in JHEP
|
JHEP 07 (2021) 106
|
10.1007/JHEP07(2021)106
| null |
hep-ph hep-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Estimating the contribution from axial-vector intermediate states to hadronic
light-by-light scattering requires input on their transition form factors
(TFFs). Due to the Landau-Yang theorem, any experiment sensitive to these TFFs
needs to involve at least one virtual photon, which complicates their
measurement. Phenomenologically, the situation is best for the $f_1(1285)$
resonance, for which information is available from $e^+e^-\to e^+e^- f_1$,
$f_1\to 4\pi$, $f_1\to \rho \gamma$, $f_1\to \phi \gamma$, and $f_1\to e^+e^-$.
We provide a comprehensive analysis of the $f_1$ TFFs in the framework of
vector meson dominance, including short-distance constraints, to determine to
which extent the three independent TFFs can be constrained from the available
experimental input, a prerequisite for improved calculations of the
axial-vector contribution to hadronic light-by-light scattering. In particular,
we focus on the process $f_1\to e^+e^-$, evidence for which has been reported
recently by SND for the first time, and discuss the impact that future improved
measurements will have on the determination of the $f_1$ TFFs.
|
[
{
"created": "Wed, 17 Mar 2021 18:00:02 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Jul 2021 10:14:11 GMT",
"version": "v2"
}
] |
2021-07-21
|
[
[
"Zanke",
"Marvin",
""
],
[
"Hoferichter",
"Martin",
""
],
[
"Kubis",
"Bastian",
""
]
] |
Estimating the contribution from axial-vector intermediate states to hadronic light-by-light scattering requires input on their transition form factors (TFFs). Due to the Landau-Yang theorem, any experiment sensitive to these TFFs needs to involve at least one virtual photon, which complicates their measurement. Phenomenologically, the situation is best for the $f_1(1285)$ resonance, for which information is available from $e^+e^-\to e^+e^- f_1$, $f_1\to 4\pi$, $f_1\to \rho \gamma$, $f_1\to \phi \gamma$, and $f_1\to e^+e^-$. We provide a comprehensive analysis of the $f_1$ TFFs in the framework of vector meson dominance, including short-distance constraints, to determine to which extent the three independent TFFs can be constrained from the available experimental input, a prerequisite for improved calculations of the axial-vector contribution to hadronic light-by-light scattering. In particular, we focus on the process $f_1\to e^+e^-$, evidence for which has been reported recently by SND for the first time, and discuss the impact that future improved measurements will have on the determination of the $f_1$ TFFs.
|
hep-ph/0310301
|
Andre Hoang
|
A. H. Hoang (Munich, Max Planck Inst.)
|
Top Pair Production at Threshold and Effective Theories
|
19 pages, appolb_mod.cls, 4 postscript figures. Invited plenary talk
at Cracow Epiphany Conference on Heavy Flavors, January 3-6, 2003
|
Acta Phys.Polon.B34:4491-4509,2003
| null |
MPP-2003-114
|
hep-ph
| null |
I give an introduction to the effective field theory description of top pair
production at threshold in e+e- annihilation. The impact of the summation of
logarithms of the top quark velocity including most recent results at
next-to-next-to-leading logarithmic order is discussed.
|
[
{
"created": "Mon, 27 Oct 2003 17:33:16 GMT",
"version": "v1"
}
] |
2009-12-30
|
[
[
"Hoang",
"A. H.",
"",
"Munich, Max Planck Inst."
]
] |
I give an introduction to the effective field theory description of top pair production at threshold in e+e- annihilation. The impact of the summation of logarithms of the top quark velocity including most recent results at next-to-next-to-leading logarithmic order is discussed.
|
hep-ph/0111273
|
Balasubramanian Ananthanarayan
|
B. Ananthanarayan, P. N. Pandita
|
Reply to Comment on Infrared Fixed Point Structure in the Minimal
Supersymmetric Standard Model with Baryon and Lepton Number Violation
|
4 pages in ReVTeX, to be published in Physical Review D
|
Phys.Rev. D65 (2002) 058902
|
10.1103/PhysRevD.65.058902
|
IISc-CTS-18/01
|
hep-ph
| null |
Infrared fixed points in the minimal supersymmetric standard model with
baryon and lepton number violation were studied and their structure elucidated
by us in Physical Review D 63 076008 (2001). Here we reply to a comment on this
paper. We emphasize that our paper concentrates on the case of the only true
infrared fixed point in the model, i.e. the stable nontrivial fixed point for
the top- and bottom-quark Yukawa couplings and the baryon number violating
coupling. For this case the comment does not affect in any manner the numerical
results and conclusions derived in our paper.
|
[
{
"created": "Thu, 22 Nov 2001 04:13:57 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Ananthanarayan",
"B.",
""
],
[
"Pandita",
"P. N.",
""
]
] |
Infrared fixed points in the minimal supersymmetric standard model with baryon and lepton number violation were studied and their structure elucidated by us in Physical Review D 63 076008 (2001). Here we reply to a comment on this paper. We emphasize that our paper concentrates on the case of the only true infrared fixed point in the model, i.e. the stable nontrivial fixed point for the top- and bottom-quark Yukawa couplings and the baryon number violating coupling. For this case the comment does not affect in any manner the numerical results and conclusions derived in our paper.
|
hep-ph/0110197
|
Nikita Agasian
|
B.O. Kerbikov
|
Color Superconducting State of Quarks
|
17 pages, LaTeX2e, no figures
| null | null | null |
hep-ph
| null |
An introductory review of physics of color superconducting state of matter is
presented. Comparison with superconductivity in electron systems reveals
difficulties involved in formulating color superconductivity theory at
moderately ultra-nuclear density.
|
[
{
"created": "Mon, 15 Oct 2001 18:30:50 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Kerbikov",
"B. O.",
""
]
] |
An introductory review of physics of color superconducting state of matter is presented. Comparison with superconductivity in electron systems reveals difficulties involved in formulating color superconductivity theory at moderately ultra-nuclear density.
|
1909.11041
|
Suman Chatterjee
|
Suman Chatterjee, Rohini Godbole, and Tuhin S. Roy
|
Jets with electrons from boosted top quarks
|
25 pages, 8 figures
|
JHEP 01 (2020) 170
|
10.1007/JHEP01(2020)170
|
TIFR/TH/19-33
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose a method to identify jets consisting of all the visible remnants
of boosted top particles when these decay semileptonically to electrons. Within
these jets, the electron shower overlaps with the shower initiated by the $b$
quark, which makes the identification of the electron hard. Even if an electron
inside a jet is identified, it is difficult to pinpoint whether the electron
rich jet is indeed due to top quark decay or not, since the invisible neutrino
carries away a nontrivial part of the energy-momentum of the original top
quark. Broadly speaking, the method proposed here has three key components. It
uses the distribution of energy in various parts of the detector to identify
whether the observed jet is consistent with a jet containing an energetic
electron. It uses the substructure of the jet to determine the momentum
associated with the electron. Finally, it constructs new variables that carry
tell-tale features of top quark decay kinematics using an extra ansatz that,
there exists a massless invisible four-momentum \emph{roughly} collimated to
the electron, which reconstructs a $W$ and a top when it is combined with the
electron and the full jet respectively. We demonstrate the efficacy of this
proposal using simulated data and show that our method not only reduces the
backgrounds from light flavor jets, $b$ jets from QCD, and hadronic top jets,
it can also tell apart jets rich in electrons but not due to top quark decays.
|
[
{
"created": "Tue, 24 Sep 2019 16:51:45 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Jan 2020 09:13:56 GMT",
"version": "v2"
}
] |
2020-02-03
|
[
[
"Chatterjee",
"Suman",
""
],
[
"Godbole",
"Rohini",
""
],
[
"Roy",
"Tuhin S.",
""
]
] |
We propose a method to identify jets consisting of all the visible remnants of boosted top particles when these decay semileptonically to electrons. Within these jets, the electron shower overlaps with the shower initiated by the $b$ quark, which makes the identification of the electron hard. Even if an electron inside a jet is identified, it is difficult to pinpoint whether the electron rich jet is indeed due to top quark decay or not, since the invisible neutrino carries away a nontrivial part of the energy-momentum of the original top quark. Broadly speaking, the method proposed here has three key components. It uses the distribution of energy in various parts of the detector to identify whether the observed jet is consistent with a jet containing an energetic electron. It uses the substructure of the jet to determine the momentum associated with the electron. Finally, it constructs new variables that carry tell-tale features of top quark decay kinematics using an extra ansatz that, there exists a massless invisible four-momentum \emph{roughly} collimated to the electron, which reconstructs a $W$ and a top when it is combined with the electron and the full jet respectively. We demonstrate the efficacy of this proposal using simulated data and show that our method not only reduces the backgrounds from light flavor jets, $b$ jets from QCD, and hadronic top jets, it can also tell apart jets rich in electrons but not due to top quark decays.
|
1702.06731
|
Johannes Knaute
|
J. Knaute, R. Yaresko, B. K\"ampfer
|
Holographic QCD phase diagram with critical point from
Einstein-Maxwell-dilaton dynamics
|
extended discussions on limitations of the holographic model; typos
corrected and refs added; to appear in PLB
|
Phys. Lett. B 778, 419 (2018)
|
10.1016/j.physletb.2018.01.053
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Supplementing the holographic Einstein-Maxwell-dilaton model of [O. DeWolfe,
S.S. Gubser, C. Rosen, Phys. Rev. D83 (2011) 086005; O. DeWolfe, S.S. Gubser,
C. Rosen, Phys. Rev. D84 (2011) 126014] by input of lattice QCD data for 2+1
flavors and physical quark masses for the equation of state and quark number
susceptibility at zero baryo-chemical potential we explore the resulting phase
diagram over the temperature-chemical potential plane. A first-order phase
transition sets in at a temperature of about 112 MeV and a baryo-chemical
potential of 612 MeV. We estimate the accuracy of the critical point position
in the order of approximately 5-8% by considering parameter variations and
different low-temperature asymptotics for the second-order quark number
susceptibility. The critical pressure as a function of the temperature has a
positive slope, i.e. the entropy per baryon jumps up when crossing the phase
border line from larger values of temperature/baryo-chemical potential, thus
classifying the phase transition as a gas liquid one. The updated holographic
model exhibits in- and outgoing isentropes in the vicinity of the first-order
phase transition.
|
[
{
"created": "Wed, 22 Feb 2017 10:09:03 GMT",
"version": "v1"
},
{
"created": "Mon, 31 Jul 2017 16:24:56 GMT",
"version": "v2"
},
{
"created": "Fri, 19 Jan 2018 14:45:32 GMT",
"version": "v3"
}
] |
2018-02-06
|
[
[
"Knaute",
"J.",
""
],
[
"Yaresko",
"R.",
""
],
[
"Kämpfer",
"B.",
""
]
] |
Supplementing the holographic Einstein-Maxwell-dilaton model of [O. DeWolfe, S.S. Gubser, C. Rosen, Phys. Rev. D83 (2011) 086005; O. DeWolfe, S.S. Gubser, C. Rosen, Phys. Rev. D84 (2011) 126014] by input of lattice QCD data for 2+1 flavors and physical quark masses for the equation of state and quark number susceptibility at zero baryo-chemical potential we explore the resulting phase diagram over the temperature-chemical potential plane. A first-order phase transition sets in at a temperature of about 112 MeV and a baryo-chemical potential of 612 MeV. We estimate the accuracy of the critical point position in the order of approximately 5-8% by considering parameter variations and different low-temperature asymptotics for the second-order quark number susceptibility. The critical pressure as a function of the temperature has a positive slope, i.e. the entropy per baryon jumps up when crossing the phase border line from larger values of temperature/baryo-chemical potential, thus classifying the phase transition as a gas liquid one. The updated holographic model exhibits in- and outgoing isentropes in the vicinity of the first-order phase transition.
|
hep-ph/9407409
|
Erwin Mirkes
|
V. Barger, E. Mirkes, R.J.N. Phillips and T. Stelzer
|
Calculation of Z Plus Four Jet Production at the Tevatron
|
8 pages (LaTeX), MAD/PH/844, RAL-94-070, to be published in Phys.
Lett. B
|
Phys.Lett.B338:336-340,1994
|
10.1016/0370-2693(94)91388-9
| null |
hep-ph
| null |
We present the first calculation of $Z+4$ jet production with heavy quark
flavor identification at the Tevatron $p\bar p$ collider. The $Z + 4$ jet
channel is especially interesting as a normalizer for the $W +4$ jet background
to top quark signals, as a background to a possible $t\to cZ$ flavor-changing
neutral-current (FCNC) decay signal, and as a background to missing-$p_T$
signals from gluino pairs. We also calculate the contributions to $W+4$ jet
production from all the different heavy-flavor final states. The MADGRAPH
program is used to generate all leading order subprocess helicity amplitudes.
We present Monte Carlo results with separation and acceptance criteria suitable
for the Tevatron experimental analyses. The dependence of the cross sections on
experimental cuts and the theoretical ambiguities due to the scale dependence
are discussed. The predicted ($W+4$ jet)/($Z+4$ jet) ratio is insensitive to
most of these choices.
|
[
{
"created": "Mon, 1 Aug 1994 03:12:09 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Sep 1994 20:19:53 GMT",
"version": "v2"
}
] |
2009-09-15
|
[
[
"Barger",
"V.",
""
],
[
"Mirkes",
"E.",
""
],
[
"Phillips",
"R. J. N.",
""
],
[
"Stelzer",
"T.",
""
]
] |
We present the first calculation of $Z+4$ jet production with heavy quark flavor identification at the Tevatron $p\bar p$ collider. The $Z + 4$ jet channel is especially interesting as a normalizer for the $W +4$ jet background to top quark signals, as a background to a possible $t\to cZ$ flavor-changing neutral-current (FCNC) decay signal, and as a background to missing-$p_T$ signals from gluino pairs. We also calculate the contributions to $W+4$ jet production from all the different heavy-flavor final states. The MADGRAPH program is used to generate all leading order subprocess helicity amplitudes. We present Monte Carlo results with separation and acceptance criteria suitable for the Tevatron experimental analyses. The dependence of the cross sections on experimental cuts and the theoretical ambiguities due to the scale dependence are discussed. The predicted ($W+4$ jet)/($Z+4$ jet) ratio is insensitive to most of these choices.
|
0808.2880
|
Patel Bhavin Mr.
|
Bhavin Patel, Ajay Majethiya and P. C. Vinodkumar
|
Masses and Magnetic moments of Triply Heavy Flavour Baryons in
Hypercentral Model
|
12 Pages, 1 Figure
|
Pramana 72:679-688,2009
|
10.1007/s12043-009-0061-4
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Triply heavy flavour baryons are studied using the hyper central description
of the three-body system. The confinement potential is assumed as hyper central
coulomb plus power potential with power index $p$. The ground state
($J^P={1/2}^+$ and ${3/2}^+$) masses of heavy flavour baryons are computed for
different power index, $ p$ starting from 0.5 to 2.0. The predicted masses are
found to attain a saturated value with respect to variation in $p$ beyond the
power index $p>1.0$. Using the spin-flavour structure of the constituting
quarks and by defining effective mass of the confined quarks within the
baryons, the magnetic moments are computed with no additional free parameters.
|
[
{
"created": "Thu, 21 Aug 2008 07:46:13 GMT",
"version": "v1"
}
] |
2010-11-02
|
[
[
"Patel",
"Bhavin",
""
],
[
"Majethiya",
"Ajay",
""
],
[
"Vinodkumar",
"P. C.",
""
]
] |
Triply heavy flavour baryons are studied using the hyper central description of the three-body system. The confinement potential is assumed as hyper central coulomb plus power potential with power index $p$. The ground state ($J^P={1/2}^+$ and ${3/2}^+$) masses of heavy flavour baryons are computed for different power index, $ p$ starting from 0.5 to 2.0. The predicted masses are found to attain a saturated value with respect to variation in $p$ beyond the power index $p>1.0$. Using the spin-flavour structure of the constituting quarks and by defining effective mass of the confined quarks within the baryons, the magnetic moments are computed with no additional free parameters.
|
0712.0796
|
Enrique Fernandez-Martinez
|
Pilar Coloma, Andrea Donini, Enrique Fernandez-Martinez, Jacobo
Lopez-Pavon
|
$\theta_{13}$, $\delta$ and the neutrino mass hierarchy at a
$\gamma=350$ double baseline Li/B $\beta$-Beam
|
35 pages, 20 figures. Minor changes, matches the published version
|
JHEP 0805:050,2008
|
10.1088/1126-6708/2008/05/050
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider a $\beta$-Beam facility where $^8$Li and $^8$B ions are
accelerated at $\gamma = 350$, accumulated in a 10 Km storage ring and let
decay, so as to produce intense $\bar \nu_e$ and $\nu_e$ beams. These beams
illuminate two iron detectors located at $L \simeq 2000$ Km and $L \simeq 7000$
Km, respectively. The physics potential of this setup is analysed in full
detail as a function of the flux. We find that, for the highest flux ($10
\times 10^{18}$ ion decays per year per baseline), the sensitivity to
$\theta_{13}$ reaches $\sin^2 2 \theta_{13} \geq 2 \times10^{-4}$; the sign of
the atmospheric mass difference can be identified, regardless of the true
hierarchy, for $\sin^2 2 \theta_{13} \geq 4\times10^{-4}$; and, CP-violation
can be discovered in 70% of the $\delta$-parameter space for $\sin^2 2
\theta_{13} \geq 10^{-3}$, having some sensitivity to CP-violation down to
$\sin^2 2 \theta_{13} \geq 10^{-4}$ for $|\delta| \sim 90^\circ$.
|
[
{
"created": "Wed, 5 Dec 2007 20:51:31 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Mar 2008 16:28:48 GMT",
"version": "v2"
},
{
"created": "Tue, 17 Jun 2008 08:02:01 GMT",
"version": "v3"
}
] |
2010-02-03
|
[
[
"Coloma",
"Pilar",
""
],
[
"Donini",
"Andrea",
""
],
[
"Fernandez-Martinez",
"Enrique",
""
],
[
"Lopez-Pavon",
"Jacobo",
""
]
] |
We consider a $\beta$-Beam facility where $^8$Li and $^8$B ions are accelerated at $\gamma = 350$, accumulated in a 10 Km storage ring and let decay, so as to produce intense $\bar \nu_e$ and $\nu_e$ beams. These beams illuminate two iron detectors located at $L \simeq 2000$ Km and $L \simeq 7000$ Km, respectively. The physics potential of this setup is analysed in full detail as a function of the flux. We find that, for the highest flux ($10 \times 10^{18}$ ion decays per year per baseline), the sensitivity to $\theta_{13}$ reaches $\sin^2 2 \theta_{13} \geq 2 \times10^{-4}$; the sign of the atmospheric mass difference can be identified, regardless of the true hierarchy, for $\sin^2 2 \theta_{13} \geq 4\times10^{-4}$; and, CP-violation can be discovered in 70% of the $\delta$-parameter space for $\sin^2 2 \theta_{13} \geq 10^{-3}$, having some sensitivity to CP-violation down to $\sin^2 2 \theta_{13} \geq 10^{-4}$ for $|\delta| \sim 90^\circ$.
|
2111.03872
|
Shilpa Jangid
|
Priyotosh Bandyopadhyay, Shilpa Jangid, Anirban Karan
|
Constraining Scalar Doublet and Triplet Leptoquarks with Vacuum
Stability and Perturbativity
|
45 pages, 56 figures, 2 tables
|
Eur. Phys. J. C 82, 516 (2022)
|
10.1140/epjc/s10052-022-10418-6
|
IITH-PH-0004/21
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the constraints on the leptoquark Yukawa couplings and
Higgs-leptoquark quartic couplings for scalar doublet leptoquark $\tilde{R}_2$,
scalar triplet leptoquark $\vec S_3$ and their combination with both three
generations and one generation from perturbative unitarity and vacuum
stability. Perturbative unitarity of all the dimensionless couplings have been
studied via one- and two-loop beta-functions. Introduction of new $SU(2)$
multiplets in terms of these leptoquarks fabricate Landau poles at two-loop
level in the gauge coupling $g_2$ at $10^{19.7}$ GeV and $10^{14.4}$ GeV,
respectively for $\vec S_3$ and $\tilde{R}_2+\vec S_3$ models with three
generations. However, such Landau pole ceases to exist for $\tilde{R}_2$ and
any of these extensions with both one and two generations till Planck scale.
The Higgs-leptoquark quartic couplings acquire severe constraints to protect
Planck scale perturbativity, whereas leptoquark Yukawa couplings get some upper
bound in order to respect Planck scale stability of Higgs Vacuum. The Higgs
quartic coupling at two-loop constraints the leptoquark Yukawa couplings for
$\tilde{R}_2,\vec S_3, \,\tilde{R}_2+\vec S_3$ with values $\lesssim 1.30,
3.90, 1.00$ with three generations. In the effective potential approach, the
presence of any of these leptoquarks with any number of generations pushes the
metastable vacuum of the Standard Model to the stable region.
|
[
{
"created": "Sat, 6 Nov 2021 12:37:55 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Jun 2022 09:14:07 GMT",
"version": "v2"
}
] |
2022-06-10
|
[
[
"Bandyopadhyay",
"Priyotosh",
""
],
[
"Jangid",
"Shilpa",
""
],
[
"Karan",
"Anirban",
""
]
] |
We investigate the constraints on the leptoquark Yukawa couplings and Higgs-leptoquark quartic couplings for scalar doublet leptoquark $\tilde{R}_2$, scalar triplet leptoquark $\vec S_3$ and their combination with both three generations and one generation from perturbative unitarity and vacuum stability. Perturbative unitarity of all the dimensionless couplings have been studied via one- and two-loop beta-functions. Introduction of new $SU(2)$ multiplets in terms of these leptoquarks fabricate Landau poles at two-loop level in the gauge coupling $g_2$ at $10^{19.7}$ GeV and $10^{14.4}$ GeV, respectively for $\vec S_3$ and $\tilde{R}_2+\vec S_3$ models with three generations. However, such Landau pole ceases to exist for $\tilde{R}_2$ and any of these extensions with both one and two generations till Planck scale. The Higgs-leptoquark quartic couplings acquire severe constraints to protect Planck scale perturbativity, whereas leptoquark Yukawa couplings get some upper bound in order to respect Planck scale stability of Higgs Vacuum. The Higgs quartic coupling at two-loop constraints the leptoquark Yukawa couplings for $\tilde{R}_2,\vec S_3, \,\tilde{R}_2+\vec S_3$ with values $\lesssim 1.30, 3.90, 1.00$ with three generations. In the effective potential approach, the presence of any of these leptoquarks with any number of generations pushes the metastable vacuum of the Standard Model to the stable region.
|
1411.0664
|
Doojin Kim
|
Won Sang Cho, James S. Gainer, Doojin Kim, Konstantin T. Matchev,
Filip Moortgat, Luc Pape, Myeonghun Park
|
Improving the sensitivity of stop searches with on-shell constrained
invariant mass variables
|
49 pages, 28 figures, revised version published in JHEP, references
added
|
JHEP 1505 (2015) 040
|
10.1007/JHEP05(2015)040
|
CTPU-14-11, APCTP Pre2014 - 014, IPMU14-0333
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The search for light stops is of paramount importance, both in general as a
promising path to the discovery of beyond the standard model physics and more
specifically as a way of evaluating the success of the naturalness paradigm.
While the LHC experiments have ruled out much of the relevant parameter space,
there are "stop gaps", i.e., values of sparticle masses for which existing LHC
analyses have relatively little sensitivity to light stops. We point out that
techniques involving on-shell constrained M_2 variables can do much to enhance
sensitivity in this region and hence help close the stop gaps. We demonstrate
the use of these variables for several benchmark points and describe the effect
of realistic complications, such as detector effects and combinatorial
backgrounds, in order to provide a useful toolkit for light stop searches in
particular, and new physics searches at the LHC in general.
|
[
{
"created": "Mon, 3 Nov 2014 21:00:00 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Sep 2015 02:11:13 GMT",
"version": "v2"
}
] |
2015-09-18
|
[
[
"Cho",
"Won Sang",
""
],
[
"Gainer",
"James S.",
""
],
[
"Kim",
"Doojin",
""
],
[
"Matchev",
"Konstantin T.",
""
],
[
"Moortgat",
"Filip",
""
],
[
"Pape",
"Luc",
""
],
[
"Park",
"Myeonghun",
""
]
] |
The search for light stops is of paramount importance, both in general as a promising path to the discovery of beyond the standard model physics and more specifically as a way of evaluating the success of the naturalness paradigm. While the LHC experiments have ruled out much of the relevant parameter space, there are "stop gaps", i.e., values of sparticle masses for which existing LHC analyses have relatively little sensitivity to light stops. We point out that techniques involving on-shell constrained M_2 variables can do much to enhance sensitivity in this region and hence help close the stop gaps. We demonstrate the use of these variables for several benchmark points and describe the effect of realistic complications, such as detector effects and combinatorial backgrounds, in order to provide a useful toolkit for light stop searches in particular, and new physics searches at the LHC in general.
|
hep-ph/0307091
|
Iain Peddie
|
Steve F. King and Iain N. R. Peddie
|
Lepton Flavour Violation from Yukawa Operators, Supergravity and the
See-Saw mechanism
|
35 pages, 3 figures; Additional references
|
Nucl.Phys. B678 (2004) 339-362
|
10.1016/j.nuclphysb.2003.10.051
|
SHEP:0320
|
hep-ph
| null |
We investigate the phenomenological impact of different sources of lepton
flavour violation arising from realistic models based on supergravity mediated
supersymmetry breaking with Yukawa operators. We discuss four distinct sources
of lepton flavour violation in such models: minimum flavour violation, arising
from neutrino masses and the see-saw mechanism with RG running; supergravity
flavour violation due to the non-universal structure of the supergravity model;
flavour violation due to Froggatt-Nielsen (FN) fields appearing in Yukawa
operators developing supersymmetry breaking F-terms and contributing in a
non-universal way to soft trilinear terms; and finally heavy Higgs flavour
violation arising from the heavy Higgs fields used to break the unified gauge
symmetry which also appear in Yukawa operators and behave analagously to the FN
fields. In order to quantify the relative effects, we study a particular type I
string inspired model based on a supersymmetric Pati-Salam model arising from
intersecting D-branes, supplemented by a U(1) family symmetry
|
[
{
"created": "Mon, 7 Jul 2003 16:17:23 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Jul 2003 15:18:53 GMT",
"version": "v2"
}
] |
2010-04-05
|
[
[
"King",
"Steve F.",
""
],
[
"Peddie",
"Iain N. R.",
""
]
] |
We investigate the phenomenological impact of different sources of lepton flavour violation arising from realistic models based on supergravity mediated supersymmetry breaking with Yukawa operators. We discuss four distinct sources of lepton flavour violation in such models: minimum flavour violation, arising from neutrino masses and the see-saw mechanism with RG running; supergravity flavour violation due to the non-universal structure of the supergravity model; flavour violation due to Froggatt-Nielsen (FN) fields appearing in Yukawa operators developing supersymmetry breaking F-terms and contributing in a non-universal way to soft trilinear terms; and finally heavy Higgs flavour violation arising from the heavy Higgs fields used to break the unified gauge symmetry which also appear in Yukawa operators and behave analagously to the FN fields. In order to quantify the relative effects, we study a particular type I string inspired model based on a supersymmetric Pati-Salam model arising from intersecting D-branes, supplemented by a U(1) family symmetry
|
hep-ph/0005308
|
Konstantin Matchev
|
Bogdan A. Dobrescu (Fermilab), Greg Landsberg (Brown U) and Konstantin
T. Matchev (Fermilab)
|
Higgs Boson Decays to CP-odd Scalars at the Tevatron and Beyond
|
4 pages, 3 figures
|
Phys.Rev.D63:075003,2001
|
10.1103/PhysRevD.63.075003
|
FERMILAB-PUB-99/324-T
|
hep-ph hep-ex
| null |
In extended Higgs models, the Higgs boson may decay into a pair of light
CP-odd scalars, with distinctive collider signatures. We study the ensuing
Higgs signals at the upgraded Tevatron, considering the subsequent decays of
the scalars into pairs of gluons or photons. For CP-odd scalars lighter than a
few GeV, the Higgs boson manifests itself as a diphoton resonance and can be
discovered up to masses of a few hundred GeV. For heavier CP-odd scalars the
reach extends at most up to $M_h\sim 120$ GeV. We also discuss the capabilities
of the LHC and lepton colliders in these channels.
|
[
{
"created": "Wed, 31 May 2000 20:45:29 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Dobrescu",
"Bogdan A.",
"",
"Fermilab"
],
[
"Landsberg",
"Greg",
"",
"Brown U"
],
[
"Matchev",
"Konstantin T.",
"",
"Fermilab"
]
] |
In extended Higgs models, the Higgs boson may decay into a pair of light CP-odd scalars, with distinctive collider signatures. We study the ensuing Higgs signals at the upgraded Tevatron, considering the subsequent decays of the scalars into pairs of gluons or photons. For CP-odd scalars lighter than a few GeV, the Higgs boson manifests itself as a diphoton resonance and can be discovered up to masses of a few hundred GeV. For heavier CP-odd scalars the reach extends at most up to $M_h\sim 120$ GeV. We also discuss the capabilities of the LHC and lepton colliders in these channels.
|
hep-ph/9406287
|
Chen Yu-qi
|
Yu-Qi Chen, Yu-Ping Kuang and Robert J. Oakes
|
On The Spin-Dependent Potential Between Heavy Quark And Antiquark
|
12 pages, REVTEX; NSF-ITP-94-49, TUIMP-TH-94/59, NUHEP-TH-94-10
|
Phys.Rev.D52:264-270,1995
|
10.1103/PhysRevD.52.264
| null |
hep-ph
| null |
A new formula for the heavy quark-antiquark spin dependent potential is given
by using the techniques developed in the heavy quark effective theory. The
leading logarithmic quark mass terms emerging from the loop contributions are
explicitly extracted and summed up. There is no renormalization scale ambiguity
in this new formula. The spin-dependent potential in the new formula is
expressed in terms of three independent color-electric and color-magnetic field
correlation functions, and it includes both the Eichten-Feinberg's formula and
the one-loop QCD result as special cases.
|
[
{
"created": "Sat, 11 Jun 1994 17:18:28 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Chen",
"Yu-Qi",
""
],
[
"Kuang",
"Yu-Ping",
""
],
[
"Oakes",
"Robert J.",
""
]
] |
A new formula for the heavy quark-antiquark spin dependent potential is given by using the techniques developed in the heavy quark effective theory. The leading logarithmic quark mass terms emerging from the loop contributions are explicitly extracted and summed up. There is no renormalization scale ambiguity in this new formula. The spin-dependent potential in the new formula is expressed in terms of three independent color-electric and color-magnetic field correlation functions, and it includes both the Eichten-Feinberg's formula and the one-loop QCD result as special cases.
|
2306.00682
|
Xun Chen
|
Xun Chen, Bo Yu, Peng-Cheng Chu, Xiao-Hua Li
|
The effect of gluon condensate on the entanglement entropy in a
holographic model
| null | null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The effect of gluon condensate on the holographic entanglement entropy is
investigated in an Einstein-Dilaton model at zero and finite temperature. There
is a critical length for the difference of entanglement entropy between the
connected and disconnected surfaces in this model, which is often regarded as a
signal of phase transition. With the increase of gluon condensate, the critical
length becomes small, which means the confinement becomes strong at zero
temperature. At finite temperatures, results show that the effect of gluon
condensate on the critical length is qualitatively consistent with the case of
zero temperature. However, the temperature will slightly increase the critical
length for a fixed gluon condensate, which indicates the temperature will
contribute to the deconfinement of the system.
|
[
{
"created": "Thu, 1 Jun 2023 13:55:44 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Oct 2023 07:33:16 GMT",
"version": "v2"
},
{
"created": "Tue, 30 Jan 2024 08:48:34 GMT",
"version": "v3"
}
] |
2024-01-31
|
[
[
"Chen",
"Xun",
""
],
[
"Yu",
"Bo",
""
],
[
"Chu",
"Peng-Cheng",
""
],
[
"Li",
"Xiao-Hua",
""
]
] |
The effect of gluon condensate on the holographic entanglement entropy is investigated in an Einstein-Dilaton model at zero and finite temperature. There is a critical length for the difference of entanglement entropy between the connected and disconnected surfaces in this model, which is often regarded as a signal of phase transition. With the increase of gluon condensate, the critical length becomes small, which means the confinement becomes strong at zero temperature. At finite temperatures, results show that the effect of gluon condensate on the critical length is qualitatively consistent with the case of zero temperature. However, the temperature will slightly increase the critical length for a fixed gluon condensate, which indicates the temperature will contribute to the deconfinement of the system.
|
hep-ph/0110105
|
Takahashi Keitaro
|
K.Takahashi and K.Sato
|
Earth effects on supernova neutrinos and their implications for neutrino
parameters
|
20 pages, 14 figures, added some discussions
|
Phys.Rev. D66 (2002) 033006
|
10.1103/PhysRevD.66.033006
|
UTAP-403/01,RESCEU-22/01
|
hep-ph astro-ph
| null |
We perform a detailed study of the Earth matter effects on supernova
neutrinos with neutrino oscillation parameter LMA and small $\theta_{13}$. The
Earth effects show significant dependences on the neutrino path length inside
the Earth and the value of $\Delta m^{2}_{12}$. We investigate rather
optimistically a possibility that we can probe the value of $\Delta m^{2}_{12}$
by the Earth effects. We assume that $\theta_{12}$ and the direction of the
supernova are known with enough accuracy and that the resonance that occurs at
higher density in supernova envelope is completely nonadiabatic. Further the
neutrino spectra before neutrinos go through the Earth are assumed to be known.
Then we show that making use of these dependences, we can obtain implication
for the value of $\Delta m^{2}_{12}$ by comparing the observed energy spectrum
to the predicted one. When SK detects neutrinos from supernova at 10kpc which
traveled through the Earth (nadir angle $<$ 80 degree), $\Delta m^{2}_{12}$ can
be determined with an accuracy of $\sim 10%$. In much of the
neutrino-detection-time-$\Delta m^{2}_{12}$ plane, $\Delta m^{2}_{12}$ might be
determined with an accuracy equal to or better than $\pm 0.5 \times 10^{-5}
{\rm eV}^{2}$.
|
[
{
"created": "Mon, 8 Oct 2001 10:48:47 GMT",
"version": "v1"
},
{
"created": "Sat, 23 Mar 2002 03:20:26 GMT",
"version": "v2"
}
] |
2009-11-07
|
[
[
"Takahashi",
"K.",
""
],
[
"Sato",
"K.",
""
]
] |
We perform a detailed study of the Earth matter effects on supernova neutrinos with neutrino oscillation parameter LMA and small $\theta_{13}$. The Earth effects show significant dependences on the neutrino path length inside the Earth and the value of $\Delta m^{2}_{12}$. We investigate rather optimistically a possibility that we can probe the value of $\Delta m^{2}_{12}$ by the Earth effects. We assume that $\theta_{12}$ and the direction of the supernova are known with enough accuracy and that the resonance that occurs at higher density in supernova envelope is completely nonadiabatic. Further the neutrino spectra before neutrinos go through the Earth are assumed to be known. Then we show that making use of these dependences, we can obtain implication for the value of $\Delta m^{2}_{12}$ by comparing the observed energy spectrum to the predicted one. When SK detects neutrinos from supernova at 10kpc which traveled through the Earth (nadir angle $<$ 80 degree), $\Delta m^{2}_{12}$ can be determined with an accuracy of $\sim 10%$. In much of the neutrino-detection-time-$\Delta m^{2}_{12}$ plane, $\Delta m^{2}_{12}$ might be determined with an accuracy equal to or better than $\pm 0.5 \times 10^{-5} {\rm eV}^{2}$.
|
0710.1212
|
Alexei Nefediev
|
A.V.Nefediev (ITEP, Moscow)
|
The nature of the light scalar mesons from their radiative decays
|
Invited talk at the International Symposium on Meson-Nucleon Physics
and the Structure of Hadrons (MENU2007), September 10-14, 2007,
Forschungszentrum Juelich, Germany; LaTeX, 4 pages, uses conference.cls, to
appear in Proceedings
|
ECONFC070910:155,2007
| null | null |
hep-ph
| null |
The nature of the light scalar mesons is one of the most intriguing open
challenges in hadronic spectroscopy. It is argued that radiative decays
involving these scalars can serve as an important decisive tool in establishing
their nature. In particular, special emphasis is made on the radiative decays
of the scalars themselves (in addition to the radiative decays of the phi-meson
with the scalars appearing in the final state), including their two-photon
decays. All the above mentioned processes are considered in detail in the
(point-like) kaon molecule model of the scalars and explicit predictions for
the decay widths are made. In addition, finite-range corrections to the
point-like results are investigated, with a special attention payed to gauge
invariance of the decay amplitude. Finally, the conclusion is made that
experimental data on the radiative decays with the light scalar mesons involved
strongly support the molecule assignment for the latter.
|
[
{
"created": "Fri, 5 Oct 2007 12:49:29 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Nefediev",
"A. V.",
"",
"ITEP, Moscow"
]
] |
The nature of the light scalar mesons is one of the most intriguing open challenges in hadronic spectroscopy. It is argued that radiative decays involving these scalars can serve as an important decisive tool in establishing their nature. In particular, special emphasis is made on the radiative decays of the scalars themselves (in addition to the radiative decays of the phi-meson with the scalars appearing in the final state), including their two-photon decays. All the above mentioned processes are considered in detail in the (point-like) kaon molecule model of the scalars and explicit predictions for the decay widths are made. In addition, finite-range corrections to the point-like results are investigated, with a special attention payed to gauge invariance of the decay amplitude. Finally, the conclusion is made that experimental data on the radiative decays with the light scalar mesons involved strongly support the molecule assignment for the latter.
|
1304.3552
|
Alfredo Valcarce
|
H. Garcilazo, A. Valcarce
|
Reply to "Comment on Strangeness -2 hypertriton"
|
1 page. Exact version accepted for publication in Physical Review
Letters
|
Phys. Rev. Lett 110, 179202 (2013)
| null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this Reply we argue that the conclusions derived in Ref. arXiv:1301.1241
are questionable.
|
[
{
"created": "Fri, 12 Apr 2013 06:50:54 GMT",
"version": "v1"
}
] |
2013-05-01
|
[
[
"Garcilazo",
"H.",
""
],
[
"Valcarce",
"A.",
""
]
] |
In this Reply we argue that the conclusions derived in Ref. arXiv:1301.1241 are questionable.
|
2301.09645
|
Keith Hamilton
|
Keith Hamilton, Alexander Karlberg, Gavin P. Salam, Ludovic Scyboz,
Rob Verheyen
|
Matching and event-shape NNDL accuracy in parton showers
|
42 pages, 14 figures; v2: matches published version; v3: corrected
typos in eqs. 1.1, 4.1, A.4, no other content affected
| null |
10.1007/JHEP03(2023)224
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
To explore the interplay of NLO matching and next-to-leading logarithmic
(NLL) parton showers, we consider the simplest case of $\gamma^*$ and
Higgs-boson decays to $q\bar q$ and $gg$ respectively. Not only should shower
NLL accuracy be retained across observables after matching, but for global
event-shape observables and the two-jet rate, matching can augment the shower
in such a way that it additionally achieves next-to-next-to-double-logarithmic
(NNDL) accuracy, a first step on the route towards general NNLL. As a
proof-of-concept exploration of this question, we consider direct application
of multiplicative matrix-element corrections, as well as simple implementations
of MC@NLO and POWHEG-style matching. We find that the first two
straightforwardly bring NNDL accuracy, and that this can also be achieved with
POWHEG, although particular care is needed in the handover between POWHEG and
the shower. Our study involves both analytic and numerical components and we
also touch on some phenomenological considerations.
|
[
{
"created": "Mon, 23 Jan 2023 19:00:00 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Apr 2023 09:19:19 GMT",
"version": "v2"
},
{
"created": "Mon, 23 Oct 2023 19:40:05 GMT",
"version": "v3"
}
] |
2023-10-25
|
[
[
"Hamilton",
"Keith",
""
],
[
"Karlberg",
"Alexander",
""
],
[
"Salam",
"Gavin P.",
""
],
[
"Scyboz",
"Ludovic",
""
],
[
"Verheyen",
"Rob",
""
]
] |
To explore the interplay of NLO matching and next-to-leading logarithmic (NLL) parton showers, we consider the simplest case of $\gamma^*$ and Higgs-boson decays to $q\bar q$ and $gg$ respectively. Not only should shower NLL accuracy be retained across observables after matching, but for global event-shape observables and the two-jet rate, matching can augment the shower in such a way that it additionally achieves next-to-next-to-double-logarithmic (NNDL) accuracy, a first step on the route towards general NNLL. As a proof-of-concept exploration of this question, we consider direct application of multiplicative matrix-element corrections, as well as simple implementations of MC@NLO and POWHEG-style matching. We find that the first two straightforwardly bring NNDL accuracy, and that this can also be achieved with POWHEG, although particular care is needed in the handover between POWHEG and the shower. Our study involves both analytic and numerical components and we also touch on some phenomenological considerations.
|
2002.00267
|
Harald Fritzsch
|
Harald Fritzsch
|
Oscillating Neutrinos and Majorana Neutrino Masses
|
9 pages
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The texture zero mass matrices for the leptons and the seesaw mechanism are
used to derive relations between the matrix elements of the lepton mixing
matrix and the ratios of the neutrino masses.
|
[
{
"created": "Sat, 1 Feb 2020 20:00:38 GMT",
"version": "v1"
}
] |
2020-02-04
|
[
[
"Fritzsch",
"Harald",
""
]
] |
The texture zero mass matrices for the leptons and the seesaw mechanism are used to derive relations between the matrix elements of the lepton mixing matrix and the ratios of the neutrino masses.
|
2309.06524
|
Osvaldo Ferreira MSc
|
Osvaldo Ferreira and Eduardo S. Fraga
|
Power corrections to the photon polarization tensor in a hot and dense
medium of massive fermions
|
10 pages, 2 figure. Additional section included in this version.
Matches the published version
| null |
10.1103/PhysRevD.109.016025
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We compute the $\mathcal{O}(k^2)$ terms (power corrections) of the photon
polarization tensor in a hot and dense medium of particles with a small but
finite mass, i.e., $0< m\ll T, \mu$. We perform our calculations within the
hard thermal loop approximation in the real-time formalism, and evaluate the
first nonzero mass corrections. For a renormalization scale $\bar{\Lambda}\sim
T$, these mass contributions determine the temperature dependence of the power
corrections. These results have direct implications in the computation of
electric and magnetic susceptibilities of hot and dense media in equilibrium.
We address such implications and make comparisons with previous results.
|
[
{
"created": "Tue, 12 Sep 2023 18:59:02 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Jan 2024 00:47:47 GMT",
"version": "v2"
}
] |
2024-01-25
|
[
[
"Ferreira",
"Osvaldo",
""
],
[
"Fraga",
"Eduardo S.",
""
]
] |
We compute the $\mathcal{O}(k^2)$ terms (power corrections) of the photon polarization tensor in a hot and dense medium of particles with a small but finite mass, i.e., $0< m\ll T, \mu$. We perform our calculations within the hard thermal loop approximation in the real-time formalism, and evaluate the first nonzero mass corrections. For a renormalization scale $\bar{\Lambda}\sim T$, these mass contributions determine the temperature dependence of the power corrections. These results have direct implications in the computation of electric and magnetic susceptibilities of hot and dense media in equilibrium. We address such implications and make comparisons with previous results.
|
0901.0986
|
Edmond Iancu
|
Edmond Iancu
|
Color Glass Condensate and its relation to HERA physics
|
14 pages, 8 figures. Invited talk at the Ringberg Workshop New Trends
in HERA Physics 2008, October 5-10 2008, Ringberg Castle, Tegernsee, Germany
| null |
10.1016/j.nuclphysbps.2009.03.135
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
I give a brief overview of the effective theory for the Color Glass
Condensate, which is the high-density gluonic matter which controls high-energy
scattering in QCD in the vicinity of the unitarity limit. I concentrate on
fundamental phenomena, like gluon saturation, unitarization, and geometric
scaling, and the way how these are encoded in the formalism. I emphasize the
importance of the next-to-leading order corrections, especially the running of
the coupling, for both conceptual and phenomenological issues. I survey the
implications of the CGC theory for the HERA physics and its phenomenological
applications based on saturation models.
|
[
{
"created": "Thu, 8 Jan 2009 08:47:48 GMT",
"version": "v1"
}
] |
2015-05-13
|
[
[
"Iancu",
"Edmond",
""
]
] |
I give a brief overview of the effective theory for the Color Glass Condensate, which is the high-density gluonic matter which controls high-energy scattering in QCD in the vicinity of the unitarity limit. I concentrate on fundamental phenomena, like gluon saturation, unitarization, and geometric scaling, and the way how these are encoded in the formalism. I emphasize the importance of the next-to-leading order corrections, especially the running of the coupling, for both conceptual and phenomenological issues. I survey the implications of the CGC theory for the HERA physics and its phenomenological applications based on saturation models.
|
2303.15996
|
Dmitry Salnikov
|
Dmitry Salnikov, Petr Satunin, D. V. Kirpichnikov and Maxim Fitkevich
|
Light-shining-through-wall cavity setups for probing ALPs
|
9 pages, 6 figures, 1 table. Revised version, accepted to JETP
Letters
| null |
10.1134/S0021364023600957
|
INR-TH-2023-004
|
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We discuss the aspects of axion-like-particles (ALPs) searches with
Light-Shining-through-Wall (LSW) experimental setups consisted of two
radio-frequency cavities. We compare the efficiencies of three setups which
involve the cavity pump modes and external magnetic fields. Additionally, we
discuss the sensitivity dependence both on the relative position of two
cylindrical cavities and on their radius-to-length ratio.
|
[
{
"created": "Tue, 28 Mar 2023 14:10:30 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Mar 2023 14:49:09 GMT",
"version": "v2"
},
{
"created": "Fri, 12 May 2023 08:50:58 GMT",
"version": "v3"
}
] |
2023-06-28
|
[
[
"Salnikov",
"Dmitry",
""
],
[
"Satunin",
"Petr",
""
],
[
"Kirpichnikov",
"D. V.",
""
],
[
"Fitkevich",
"Maxim",
""
]
] |
We discuss the aspects of axion-like-particles (ALPs) searches with Light-Shining-through-Wall (LSW) experimental setups consisted of two radio-frequency cavities. We compare the efficiencies of three setups which involve the cavity pump modes and external magnetic fields. Additionally, we discuss the sensitivity dependence both on the relative position of two cylindrical cavities and on their radius-to-length ratio.
|
0810.1301
|
Steve Blanchet
|
Steve Blanchet and Pavel Fileviez Perez
|
On the Role of Low-Energy CP Violation in Leptogenesis
|
12 pages, 6 figures
|
Mod.Phys.Lett.A24:1399-1409,2009
|
10.1142/S0217732309030862
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The link between low-energy CP violation and leptogenesis became more
accessible with the understanding of flavor effects. However, a definite
well-motivated model where such a link occurs was still lacking. Adjoint SU(5)
is a simple grand unified theory where neutrino masses are generated through
the Type I and Type III seesaw mechanisms, and the lepton asymmetry is
generated by the fermionic triplet responsible for the Type III seesaw. We
focus exclusively on the case of inverted hierarchy for neutrinos, and we show
that successful flavored leptogenesis in this theory strongly points towards
low-energy CP violation. Moreover, since the range of allowed masses for the
triplet is very restricted, we find that the discovery at the LHC of new states
present in the theory, together with proton decay and unification of gauge
couplings, can conspire to provide a hint in favor of leptogenesis.
|
[
{
"created": "Wed, 8 Oct 2008 17:59:26 GMT",
"version": "v1"
}
] |
2014-11-18
|
[
[
"Blanchet",
"Steve",
""
],
[
"Perez",
"Pavel Fileviez",
""
]
] |
The link between low-energy CP violation and leptogenesis became more accessible with the understanding of flavor effects. However, a definite well-motivated model where such a link occurs was still lacking. Adjoint SU(5) is a simple grand unified theory where neutrino masses are generated through the Type I and Type III seesaw mechanisms, and the lepton asymmetry is generated by the fermionic triplet responsible for the Type III seesaw. We focus exclusively on the case of inverted hierarchy for neutrinos, and we show that successful flavored leptogenesis in this theory strongly points towards low-energy CP violation. Moreover, since the range of allowed masses for the triplet is very restricted, we find that the discovery at the LHC of new states present in the theory, together with proton decay and unification of gauge couplings, can conspire to provide a hint in favor of leptogenesis.
|
hep-ph/9704398
|
Frank Klingl
|
F. Klingl, N. Kaiser and W. Weise
|
Current correlation functions, QCD sum rules and vector mesons in
baryonic matter
|
40 pages, LaTeX 2e,10 figures in eps , submitted to Nucl.Phys.A
|
Nucl.Phys.A624:527-563,1997
|
10.1016/S0375-9474(97)88960-9
| null |
hep-ph nucl-th
| null |
Based on an effective Lagrangian which combines chiral SU(3) dynamics with
vector meson dominance, we have developed a model for the forward vector
meson-nucleon scattering amplitudes. We use this as an input to calculate the
low energy part of the current-current correlation function in nuclear matter.
Its spectrum enters directly in the ``left hand side'' of QCD sum rules. For
the isovector channel we find a significant enhancement of the in-medium
spectral density below the rho resonance while the rho meson mass itself
changes only slightly. The situation is different in the isoscalar channel,
where the mass and peak position of the omega meson move downward while its
width increases less drastically than in the rho meson case. For the phi meson
we find almost no mass shift; the width of the peak broadens moderately. We
observe a remarkable degree of consistency with the operator product expansion
of QCD sum rules in all three channels. We point out, however, that these
results cannot simply be interpreted, as commonly done, in terms of a universal
rescaling of vector meson masses in matter.
|
[
{
"created": "Thu, 24 Apr 1997 14:08:51 GMT",
"version": "v1"
}
] |
2009-07-09
|
[
[
"Klingl",
"F.",
""
],
[
"Kaiser",
"N.",
""
],
[
"Weise",
"W.",
""
]
] |
Based on an effective Lagrangian which combines chiral SU(3) dynamics with vector meson dominance, we have developed a model for the forward vector meson-nucleon scattering amplitudes. We use this as an input to calculate the low energy part of the current-current correlation function in nuclear matter. Its spectrum enters directly in the ``left hand side'' of QCD sum rules. For the isovector channel we find a significant enhancement of the in-medium spectral density below the rho resonance while the rho meson mass itself changes only slightly. The situation is different in the isoscalar channel, where the mass and peak position of the omega meson move downward while its width increases less drastically than in the rho meson case. For the phi meson we find almost no mass shift; the width of the peak broadens moderately. We observe a remarkable degree of consistency with the operator product expansion of QCD sum rules in all three channels. We point out, however, that these results cannot simply be interpreted, as commonly done, in terms of a universal rescaling of vector meson masses in matter.
|
hep-ph/0103209
|
Alessandro Drago
|
Alessandro Drago and Andrea Lavagno
|
From Quark Stars to Hybrid Stars
|
10 pages, 4 figures, 1 table
|
Phys.Lett. B511 (2001) 229-234
|
10.1016/S0370-2693(01)00579-2
| null |
hep-ph astro-ph nucl-th
| null |
We show the possible existence of compact stars having a surface composed of
a mixed phase of quarks and hadrons. This scenario can be realized both for
self-bound stars, satisfying the so-called Witten-Bodmer hypothesis, and for
gravitationally bound stars. This class of solutions of the
Tolman-Oppenheimer-Volkoff equation can be obtained in all the models we
discuss, within a physically acceptable range of values of the model
parameters.
|
[
{
"created": "Tue, 20 Mar 2001 03:31:47 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Drago",
"Alessandro",
""
],
[
"Lavagno",
"Andrea",
""
]
] |
We show the possible existence of compact stars having a surface composed of a mixed phase of quarks and hadrons. This scenario can be realized both for self-bound stars, satisfying the so-called Witten-Bodmer hypothesis, and for gravitationally bound stars. This class of solutions of the Tolman-Oppenheimer-Volkoff equation can be obtained in all the models we discuss, within a physically acceptable range of values of the model parameters.
|
1201.6300
|
Ulrich Jentschura
|
U. D. Jentschura
|
Dirac Hamiltonian with Imaginary Mass and Induced Helicity-Dependence by
Indefinite Metric
|
8 pages; RevTeX; published in J.Mod.Phys
|
J.Mod.Phys. 3 (2012) 887-894
|
10.4236/jmp.2012.39116
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
It is of general theoretical interest to investigate the properties of
superluminal matter wave equations for spin one-half particles. One can either
enforce superluminal propagation by an explicit substitution of the real mass
term for an imaginary mass, or one can use a matrix representation of the
imaginary unit that multiplies the mass term. The latter leads to the tachyonic
Dirac equation, while the equation obtained by the substitution m->i*m in the
Dirac equation is naturally referred to as the imaginary-mass Dirac equation.
Both the tachyonic as well as the imaginary-mass Dirac Hamiltonians commute
with the helicity operator. Both Hamiltonians are pseudo-Hermitian and also
possess additional modified pseudo-Hermitian properties, leading to constraints
on the resonance eigenvalues. Here, by an explicit calculation, we show that
specific sum rules over the spectrum hold for the wave functions corresponding
to the well-defined real energy eigenvalues and complex resonance and
anti-resonance energies. In the quantized imaginary-mass Dirac field,
one-particle states of right-handed helicity acquire a negative norm
("indefinite metric") and can be excluded from the physical spectrum by a
Gupta--Bleuler type condition.
|
[
{
"created": "Mon, 30 Jan 2012 17:43:46 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Apr 2012 14:58:07 GMT",
"version": "v2"
},
{
"created": "Thu, 5 Jul 2012 15:14:48 GMT",
"version": "v3"
},
{
"created": "Wed, 3 Oct 2012 11:23:36 GMT",
"version": "v4"
}
] |
2012-10-04
|
[
[
"Jentschura",
"U. D.",
""
]
] |
It is of general theoretical interest to investigate the properties of superluminal matter wave equations for spin one-half particles. One can either enforce superluminal propagation by an explicit substitution of the real mass term for an imaginary mass, or one can use a matrix representation of the imaginary unit that multiplies the mass term. The latter leads to the tachyonic Dirac equation, while the equation obtained by the substitution m->i*m in the Dirac equation is naturally referred to as the imaginary-mass Dirac equation. Both the tachyonic as well as the imaginary-mass Dirac Hamiltonians commute with the helicity operator. Both Hamiltonians are pseudo-Hermitian and also possess additional modified pseudo-Hermitian properties, leading to constraints on the resonance eigenvalues. Here, by an explicit calculation, we show that specific sum rules over the spectrum hold for the wave functions corresponding to the well-defined real energy eigenvalues and complex resonance and anti-resonance energies. In the quantized imaginary-mass Dirac field, one-particle states of right-handed helicity acquire a negative norm ("indefinite metric") and can be excluded from the physical spectrum by a Gupta--Bleuler type condition.
|
2103.11814
|
Dmitry Gorbunov
|
Dmitry Gorbunov, Igor Krasnov, Yury Kudenko, Sergey Suvorov
|
Double-Hit Signature of Millicharged Particles in 3D segmented neutrino
detector
|
15 pages, 8 figures; v2: replaced with published version
| null |
10.1016/j.physletb.2021.136641
|
INR-TH-2021-006
|
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
We calculate the production of hypothetical millicharged particles (MCPs) of
sub-GeV masses by the J-PARC proton beam in the framework of T2K and future
T2HK neutrino oscillation experiments. Concentrating on the region of model
parameter space, where an MCP can hit the near neutrino detector twice, we
adopt this background-free signature to estimate the sensitivity of T2K and
T2HK experiments to MCPs. We find that a previously inaccessible in direct
searches region of charges 5$\times$$10^{-4}$-$10^{-2}$ $e$ for MCP masses
0.1-0.5 GeV can be probed.
|
[
{
"created": "Mon, 22 Mar 2021 13:13:42 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Sep 2021 11:37:47 GMT",
"version": "v2"
}
] |
2021-10-01
|
[
[
"Gorbunov",
"Dmitry",
""
],
[
"Krasnov",
"Igor",
""
],
[
"Kudenko",
"Yury",
""
],
[
"Suvorov",
"Sergey",
""
]
] |
We calculate the production of hypothetical millicharged particles (MCPs) of sub-GeV masses by the J-PARC proton beam in the framework of T2K and future T2HK neutrino oscillation experiments. Concentrating on the region of model parameter space, where an MCP can hit the near neutrino detector twice, we adopt this background-free signature to estimate the sensitivity of T2K and T2HK experiments to MCPs. We find that a previously inaccessible in direct searches region of charges 5$\times$$10^{-4}$-$10^{-2}$ $e$ for MCP masses 0.1-0.5 GeV can be probed.
|
1707.09130
|
Kazuya Mameda
|
Hao-Lei Chen, Kenji Fukushima, Xu-Guang Huang, and Kazuya Mameda
|
Surface Magnetic Catalysis
|
11 pages, 4 figures
|
Phys. Rev. D 96, 054032 (2017)
|
10.1103/PhysRevD.96.054032
| null |
hep-ph cond-mat.mes-hall hep-th nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study fermions in a magnetic field in a finite size cylinder. With the
boundary condition for the fermion flux, we show that the energy spectra and
the wave-functions are modified by the finite size effect; the boundary makes
the degenerate Landau levels appear only partially for states with small
angular momenta, while the boundary effect becomes stronger for states with
large angular momenta. We find that mode accumulation at the boundary occurs
for large angular momenta and the magnetic effect is enhanced on the boundary
surface. Using a simple fermionic model, we quantify the magnetic catalysis,
i.e. the magnetic enhancement of the fermion pair condensation, in a finite
size cylinder. We confirm that the magnetic catalysis is strongly amplified at
the boundary due to the mode accumulation.
|
[
{
"created": "Fri, 28 Jul 2017 07:34:27 GMT",
"version": "v1"
},
{
"created": "Sat, 30 Sep 2017 03:08:08 GMT",
"version": "v2"
}
] |
2017-10-04
|
[
[
"Chen",
"Hao-Lei",
""
],
[
"Fukushima",
"Kenji",
""
],
[
"Huang",
"Xu-Guang",
""
],
[
"Mameda",
"Kazuya",
""
]
] |
We study fermions in a magnetic field in a finite size cylinder. With the boundary condition for the fermion flux, we show that the energy spectra and the wave-functions are modified by the finite size effect; the boundary makes the degenerate Landau levels appear only partially for states with small angular momenta, while the boundary effect becomes stronger for states with large angular momenta. We find that mode accumulation at the boundary occurs for large angular momenta and the magnetic effect is enhanced on the boundary surface. Using a simple fermionic model, we quantify the magnetic catalysis, i.e. the magnetic enhancement of the fermion pair condensation, in a finite size cylinder. We confirm that the magnetic catalysis is strongly amplified at the boundary due to the mode accumulation.
|
2205.06041
|
Danny van Dyk
|
Thomas Blake, Stefan Meinel, Muslem Rahimi, Danny van Dyk
|
Dispersive bounds for local form factors in $\Lambda_b \to \Lambda$
transitions
|
20 pages, 4 figures
|
Phys. Rev. D 108, 094509 (2023)
|
10.1103/PhysRevD.108.094509
|
EOS-2022-01, P3H-22-046, SI-HEP-2022-09, TUM-HEP 1399/22
|
hep-ph hep-lat
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the ten independent local form-factors relevant to the
$b$-baryon decay $\Lambda_b \to \Lambda \ell^+\ell^-$, combining information of
lattice QCD and dispersive bounds. We propose a novel parametrization of the
form factors in terms of orthonormal polynomials that diagonalizes the form
factor contributions to the dispersive bounds. This is a generalization of the
unitarity bounds developed for meson-to-meson form-factors. In contrast to
ad-hoc parametrizations of these form factors, our parametrization provides a
degree of control of the form-factor uncertainties at large hadronic recoil.
This is of phenomenological interest for theoretical predictions of, e.g.,
$\Lambda_b\to \Lambda \gamma$ and $\Lambda_b\to\Lambda \ell^+\ell^-$ decay
processes.
|
[
{
"created": "Thu, 12 May 2022 11:55:51 GMT",
"version": "v1"
},
{
"created": "Tue, 31 May 2022 14:25:28 GMT",
"version": "v2"
},
{
"created": "Wed, 22 Nov 2023 16:52:15 GMT",
"version": "v3"
}
] |
2023-11-27
|
[
[
"Blake",
"Thomas",
""
],
[
"Meinel",
"Stefan",
""
],
[
"Rahimi",
"Muslem",
""
],
[
"van Dyk",
"Danny",
""
]
] |
We investigate the ten independent local form-factors relevant to the $b$-baryon decay $\Lambda_b \to \Lambda \ell^+\ell^-$, combining information of lattice QCD and dispersive bounds. We propose a novel parametrization of the form factors in terms of orthonormal polynomials that diagonalizes the form factor contributions to the dispersive bounds. This is a generalization of the unitarity bounds developed for meson-to-meson form-factors. In contrast to ad-hoc parametrizations of these form factors, our parametrization provides a degree of control of the form-factor uncertainties at large hadronic recoil. This is of phenomenological interest for theoretical predictions of, e.g., $\Lambda_b\to \Lambda \gamma$ and $\Lambda_b\to\Lambda \ell^+\ell^-$ decay processes.
|
1104.3737
|
Bo-Qiang Ma
|
Haitao Liu, Yujie Chi, Lijing Shao, Bo-Qiang Ma
|
Octet Quark Contents from SU(3) Flavor Symmetry
|
6 pages, 5 figures, final version for journal publication
|
Europhys.Lett.94:31001,2011
|
10.1209/0295-5075/94/31001
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
With the parametrization of parton distribution functions (PDFs) of the
proton by Soffer \textit{et al.}, we extend the valence quark contents to other
octet baryons by utilizing SU(3) flavor symmetry. We find the method
practically useful. Fragmentation functions (FFs) are further obtained through
the phenomenological Gribov-Lipatov relation at the $x \to 1$ region. Our
results are compared with different models, and these different predictions can
be discriminated by upcoming experiments.
|
[
{
"created": "Tue, 19 Apr 2011 13:03:43 GMT",
"version": "v1"
}
] |
2011-05-23
|
[
[
"Liu",
"Haitao",
""
],
[
"Chi",
"Yujie",
""
],
[
"Shao",
"Lijing",
""
],
[
"Ma",
"Bo-Qiang",
""
]
] |
With the parametrization of parton distribution functions (PDFs) of the proton by Soffer \textit{et al.}, we extend the valence quark contents to other octet baryons by utilizing SU(3) flavor symmetry. We find the method practically useful. Fragmentation functions (FFs) are further obtained through the phenomenological Gribov-Lipatov relation at the $x \to 1$ region. Our results are compared with different models, and these different predictions can be discriminated by upcoming experiments.
|
1008.1497
|
Alysson Fabio Ferrari Prof.
|
A. F. Ferrari and A. Yu. Petrov
|
Lorentz violation in the linearized gravity
|
Presented at the Fifth Meeting on CPT and Lorentz Symmetry,
Bloomington, Indiana, June 28-July 2, 2010
| null |
10.1142/9789814327688_0053
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study some consequences of the introduction of a Lorentz-violating
modification term in the linearized gravity, which leads to modified dispersion
relations for gravitational waves in the vacuum. We also discuss possible
mechanisms for the induction of such a term in the Lagrangian.
|
[
{
"created": "Mon, 9 Aug 2010 13:14:46 GMT",
"version": "v1"
}
] |
2017-08-23
|
[
[
"Ferrari",
"A. F.",
""
],
[
"Petrov",
"A. Yu.",
""
]
] |
We study some consequences of the introduction of a Lorentz-violating modification term in the linearized gravity, which leads to modified dispersion relations for gravitational waves in the vacuum. We also discuss possible mechanisms for the induction of such a term in the Lagrangian.
|
1709.02662
|
Davide Meloni
|
Davide Meloni
|
GUT and flavor models for neutrino masses and mixing
|
Added new references
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the recent years neutrino experiments have studied in detail the
phenomenon of neutrino oscillations and most of the oscillation parameters have
been measured with a good accuracy. However, in spite of many interesting
ideas, the problem of flavor in the lepton sector remains an open issue. In
this review, we discuss the state of the art of models for neutrino masses and
mixings formulated in the context of flavor symmetries, with particular
emphasis on the role played by grand unified gauge groups.
|
[
{
"created": "Fri, 8 Sep 2017 11:49:49 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Oct 2017 12:36:30 GMT",
"version": "v2"
}
] |
2017-10-06
|
[
[
"Meloni",
"Davide",
""
]
] |
In the recent years neutrino experiments have studied in detail the phenomenon of neutrino oscillations and most of the oscillation parameters have been measured with a good accuracy. However, in spite of many interesting ideas, the problem of flavor in the lepton sector remains an open issue. In this review, we discuss the state of the art of models for neutrino masses and mixings formulated in the context of flavor symmetries, with particular emphasis on the role played by grand unified gauge groups.
|
0904.0030
|
Pedro Bicudo
|
P. Bicudo
|
Gluon Excitations and Quark Chiral Symmetry in the Meson Spectrum: an
Einbein Solution to the Large Degeneracy Problem of Light Mesons
|
2 figures, 1 table, more detailed version
|
Phys.Rev.D81:014011,2010
|
10.1103/PhysRevD.81.014011
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A large approximate degeneracy of the excited hadron spectra, appears in the
light meson spectra measured at LEAR, suggesting a novel principal quantum
number n+j in QCD spectra. We recently showed that the large degeneracy could
not be understood with state of the art confining and chiral invariant quark
models, derived in a truncated Coulomb gauge. To search for a solution to this
problem, here we add the gluon or string degrees of freedom. Although
independently the quarks or the gluons would lead to a 2 n +j or 2 n +l
spectrum, adding them may lead to the desired n+j pattern.
|
[
{
"created": "Tue, 31 Mar 2009 23:14:21 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Nov 2009 12:24:38 GMT",
"version": "v2"
}
] |
2010-04-06
|
[
[
"Bicudo",
"P.",
""
]
] |
A large approximate degeneracy of the excited hadron spectra, appears in the light meson spectra measured at LEAR, suggesting a novel principal quantum number n+j in QCD spectra. We recently showed that the large degeneracy could not be understood with state of the art confining and chiral invariant quark models, derived in a truncated Coulomb gauge. To search for a solution to this problem, here we add the gluon or string degrees of freedom. Although independently the quarks or the gluons would lead to a 2 n +j or 2 n +l spectrum, adding them may lead to the desired n+j pattern.
|
0911.3892
|
P. Q. Hung
|
P. Q. Hung and Chi Xiong
|
Implication of a Quasi Fixed Point with a Heavy Fourth Generation: The
emergence of a TeV-scale physical cutoff
|
6 pages, 4 figures. Title changed, modified abstract,added
figure,added comments
|
Phys.Lett.B694:430-434,2011
|
10.1016/j.physletb.2010.10.004
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
It has been shown in a recent paper that the Higgs quartic and Yukawa sectors
of the Standard Model (SM) with a heavy fourth generation exhibit at a two-loop
level a quasi fixed point structure instead of the one-loop Landau singularity
and which could be located in the TeV region, a scale which is denoted by
$\Lambda_{FP} $ in this paper. This provides the possibility of the existence
of a TeV-scale physical cutoff endowed with several implications. In the
vicinity of this quasi fixed point
bound states and Higgs-like condensates made up of the 4th generation quarks
and leptons get formed. It implies the possibility of a dynamical electroweak
symmetry breaking generated by 4th generation condensates. The quasi fixed
points also hint at at a possible restoration of scale symmetry at
$\Lambda_{FP} $ and above and the emergence of a theory which could be deeper
than the SM.
|
[
{
"created": "Thu, 19 Nov 2009 20:53:32 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Dec 2010 17:39:42 GMT",
"version": "v2"
}
] |
2011-04-20
|
[
[
"Hung",
"P. Q.",
""
],
[
"Xiong",
"Chi",
""
]
] |
It has been shown in a recent paper that the Higgs quartic and Yukawa sectors of the Standard Model (SM) with a heavy fourth generation exhibit at a two-loop level a quasi fixed point structure instead of the one-loop Landau singularity and which could be located in the TeV region, a scale which is denoted by $\Lambda_{FP} $ in this paper. This provides the possibility of the existence of a TeV-scale physical cutoff endowed with several implications. In the vicinity of this quasi fixed point bound states and Higgs-like condensates made up of the 4th generation quarks and leptons get formed. It implies the possibility of a dynamical electroweak symmetry breaking generated by 4th generation condensates. The quasi fixed points also hint at at a possible restoration of scale symmetry at $\Lambda_{FP} $ and above and the emergence of a theory which could be deeper than the SM.
|
hep-ph/0409023
|
Cyrille Marquet
|
Cyrille Marquet
|
A QCD dipole formalism for forward-gluon production
|
13 pages, 3 figures, Section II expanded, version to be published in
NPB
|
Nucl.Phys. B705 (2005) 319-338
|
10.1016/j.nuclphysb.2004.11.015
| null |
hep-ph
| null |
We derive inclusive and diffractive forward-gluon production in the
scattering of a $q\bar{q}$ dipole off an arbitrary target in the high-energy
eikonal approximation, suitable to study the saturation regime. We show how the
inclusive cross-section is related to the total cross-section for the
scattering of a colorless pair of gluons on the target: the gluon-production
cross-section can be expressed as a convolution between this $gg$ dipole total
cross-section and a dipole distribution. We then consider as an application the
forward-jet production from an incident hadron and describe forward-jet
production at HERA and Mueller-Navelet jets at Tevatron or LHC. We show how
these measurements are related to the $q\bar{q}-gg$ or $gg-gg$ dipole-dipole
cross-sections and why they are therefore well-suited for studying high-energy
scattering in QCD.
|
[
{
"created": "Thu, 2 Sep 2004 16:36:55 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Nov 2004 14:42:00 GMT",
"version": "v2"
}
] |
2009-11-10
|
[
[
"Marquet",
"Cyrille",
""
]
] |
We derive inclusive and diffractive forward-gluon production in the scattering of a $q\bar{q}$ dipole off an arbitrary target in the high-energy eikonal approximation, suitable to study the saturation regime. We show how the inclusive cross-section is related to the total cross-section for the scattering of a colorless pair of gluons on the target: the gluon-production cross-section can be expressed as a convolution between this $gg$ dipole total cross-section and a dipole distribution. We then consider as an application the forward-jet production from an incident hadron and describe forward-jet production at HERA and Mueller-Navelet jets at Tevatron or LHC. We show how these measurements are related to the $q\bar{q}-gg$ or $gg-gg$ dipole-dipole cross-sections and why they are therefore well-suited for studying high-energy scattering in QCD.
|
hep-ph/0102230
|
Xin-Nian Wang
|
Xin-Nian Wang and Xiaofeng Guo
|
Multiple Parton Scattering in Nuclei: Parton Energy Loss
|
Final version published in Nucl. Phys. A. 40 pages in RevTex with 15
postscript figures
|
Nucl.Phys.A696:788-832,2001
|
10.1016/S0375-9474(01)01130-7
|
LBNL-47155
|
hep-ph nucl-th
| null |
Multiple parton scattering and induced parton energy loss is studied in
deeply inelastic scattering (DIS) off nuclei. The effect of multiple scattering
of a highly off-shell quark and the induced parton energy loss is expressed in
terms of the modification to the quark fragmentation functions. We derive such
modified quark fragmentation functions and their QCD evolution equations in DIS
using generalized factorization of higher twist parton distributions. We
consider double-hard, hard-soft parton scattering as well as their
interferences in the same framework. The final result, which depends on both
the diagonal and off-diagonal twist-four parton distributions in nuclei,
demonstrates clearly the Landau-Pomeranchuk-Migdal interference features and
predicts a unique nuclear modification of the quark fragmentation functions.
|
[
{
"created": "Mon, 19 Feb 2001 08:12:18 GMT",
"version": "v1"
},
{
"created": "Sat, 29 Dec 2001 22:02:19 GMT",
"version": "v2"
}
] |
2014-11-17
|
[
[
"Wang",
"Xin-Nian",
""
],
[
"Guo",
"Xiaofeng",
""
]
] |
Multiple parton scattering and induced parton energy loss is studied in deeply inelastic scattering (DIS) off nuclei. The effect of multiple scattering of a highly off-shell quark and the induced parton energy loss is expressed in terms of the modification to the quark fragmentation functions. We derive such modified quark fragmentation functions and their QCD evolution equations in DIS using generalized factorization of higher twist parton distributions. We consider double-hard, hard-soft parton scattering as well as their interferences in the same framework. The final result, which depends on both the diagonal and off-diagonal twist-four parton distributions in nuclei, demonstrates clearly the Landau-Pomeranchuk-Migdal interference features and predicts a unique nuclear modification of the quark fragmentation functions.
|
1310.6352
|
Jan Heisig
|
Jan Heisig
|
Gravitino LSP and leptogenesis after the first LHC results
|
19 pages + references, 9 eps figures; v2: analysis improved, figures
2-5 updated, conclusions unchanged, presentation improved, references added,
matches journal version
|
JCAP04(2014)023
|
10.1088/1475-7516/2014/04/023
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Supersymmetric scenarios where the lightest superparticle (LSP) is the
gravitino are an attractive alternative to the widely studied case of a
neutralino LSP. A strong motivation for a gravitino LSP arises from the
possibility of achieving higher reheating temperatures and thus potentially
allow for thermal leptogenesis. The predictions for the primordial abundances
of light elements in the presence of a late decaying next-to-LSP (NSLP) as well
as the currently measured dark matter abundance allow us to probe the
cosmological viability of such a scenario. Here we consider a gravitino-stau
scenario. Utilizing a pMSSM scan we work out the implications of the 7 and 8
TeV LHC results as well as other experimental and theoretical constraints on
the highest reheating temperatures that are cosmologically allowed. Our
analysis shows that points with T_R>10^9 GeV survive only in a very particular
corner of the SUSY parameter space. Those spectra feature a distinct signature
at colliders that could be looked at in the upcoming LHC run.
|
[
{
"created": "Wed, 23 Oct 2013 20:00:00 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Apr 2014 20:04:35 GMT",
"version": "v2"
}
] |
2014-04-24
|
[
[
"Heisig",
"Jan",
""
]
] |
Supersymmetric scenarios where the lightest superparticle (LSP) is the gravitino are an attractive alternative to the widely studied case of a neutralino LSP. A strong motivation for a gravitino LSP arises from the possibility of achieving higher reheating temperatures and thus potentially allow for thermal leptogenesis. The predictions for the primordial abundances of light elements in the presence of a late decaying next-to-LSP (NSLP) as well as the currently measured dark matter abundance allow us to probe the cosmological viability of such a scenario. Here we consider a gravitino-stau scenario. Utilizing a pMSSM scan we work out the implications of the 7 and 8 TeV LHC results as well as other experimental and theoretical constraints on the highest reheating temperatures that are cosmologically allowed. Our analysis shows that points with T_R>10^9 GeV survive only in a very particular corner of the SUSY parameter space. Those spectra feature a distinct signature at colliders that could be looked at in the upcoming LHC run.
|
1712.03830
|
Ye Xing
|
Yu-Ji Shi and Wei Wang and Ye Xing and Ji Xu
|
Weak Decays of Doubly Heavy Baryons: Multi-body Decay Channels
|
47pages, 1figure. arXiv admin note: substantial text overlap with
arXiv:1707.06570
|
Eur. Phys. J. C, 78 (2018) 56
|
10.1140/epjc/s10052-018-5532-7
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The newly-discovered $\Xi_{cc}^{++}$ decays into the $ \Lambda_{c}^+
K^-\pi^+\pi^+$, but the experimental data has indicated that this decay is not
saturated by any two-body intermediate state. In this work, we analyze the
multi-body weak decays of doubly heavy baryons $\Xi_{cc}$, $\Omega_{cc}$,
$\Xi_{bc}$, $\Omega_{bc}$, $\Xi_{bb}$ and $\Omega_{bb}$, in particular the
three-body nonleptonic decays and four-body semileptonic decays. We classify
various decay modes according to the quark-level transitions and present an
estimate of the typical branching fractions for a few golden decay channels.
Decay amplitudes are then parametrized in terms of a few SU(3) irreducible
amplitudes. With these amplitudes, we find a number of relations for decay
widths, which can be examined in future.
|
[
{
"created": "Fri, 8 Dec 2017 11:16:15 GMT",
"version": "v1"
}
] |
2018-01-26
|
[
[
"Shi",
"Yu-Ji",
""
],
[
"Wang",
"Wei",
""
],
[
"Xing",
"Ye",
""
],
[
"Xu",
"Ji",
""
]
] |
The newly-discovered $\Xi_{cc}^{++}$ decays into the $ \Lambda_{c}^+ K^-\pi^+\pi^+$, but the experimental data has indicated that this decay is not saturated by any two-body intermediate state. In this work, we analyze the multi-body weak decays of doubly heavy baryons $\Xi_{cc}$, $\Omega_{cc}$, $\Xi_{bc}$, $\Omega_{bc}$, $\Xi_{bb}$ and $\Omega_{bb}$, in particular the three-body nonleptonic decays and four-body semileptonic decays. We classify various decay modes according to the quark-level transitions and present an estimate of the typical branching fractions for a few golden decay channels. Decay amplitudes are then parametrized in terms of a few SU(3) irreducible amplitudes. With these amplitudes, we find a number of relations for decay widths, which can be examined in future.
|
1712.04880
|
Shaikh Saad
|
Shaikh Saad
|
Fermion Masses and Mixings, Leptogenesis and Baryon Number Violation in
Pati-Salam Model
|
48 pages, 10 figures. Replacement to match the published version
|
Nuclear Physics B 943 (2019) 114630
|
10.1016/j.nuclphysb.2019.114630
|
OSU-HEP-17-06
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this work we study a predictive model based on a partially unified theory
possessing the gauge symmetry of the Pati-Salam group, $SU(2)_L\times
SU(2)_R\times SU(4)_C$ supplemented by a global Peccei-Quinn symmetry,
$U(1)_{PQ}$. A comprehensive analysis of the Higgs potential is carried out in
a minimal set-up. The assumed Peccei-Quinn symmetry along with solving the
strong CP problem, can provide axion as the dark matter candidate. This minimal
set-up with limited number of Yukawa parameters can successfully incorporate
the hierarchies in the charged fermion masses and mixings. The automatic
existence of the heavy Majorana neutrinos generate the extremely small light
neutrino masses through the seesaw mechanism, which is also responsible for
producing the observed cosmological matter-antimatter asymmetry of the
universe. We find interesting correlation between the low scale neutrino
observables and the baryon asymmetry in this model. Baryon number violating
nucleon decay processes mediated by the scalar diquarks and leptoquarks in this
framework are found to be, $n,p\to \ell+m, \ell^c + m$ ($m=$ meson, $\ell=$
lepton, $\ell^c=$ antilepton) and $n,p\to \ell+\ell^c + \ell^c$. For some
choice of the parameters of the theory, these decay rates can be within the
observable range. Another baryon number violating process, the
neutron-antineutron oscillation can also be in the observable range.
|
[
{
"created": "Wed, 13 Dec 2017 17:49:05 GMT",
"version": "v1"
},
{
"created": "Fri, 10 May 2019 23:38:22 GMT",
"version": "v2"
}
] |
2019-05-14
|
[
[
"Saad",
"Shaikh",
""
]
] |
In this work we study a predictive model based on a partially unified theory possessing the gauge symmetry of the Pati-Salam group, $SU(2)_L\times SU(2)_R\times SU(4)_C$ supplemented by a global Peccei-Quinn symmetry, $U(1)_{PQ}$. A comprehensive analysis of the Higgs potential is carried out in a minimal set-up. The assumed Peccei-Quinn symmetry along with solving the strong CP problem, can provide axion as the dark matter candidate. This minimal set-up with limited number of Yukawa parameters can successfully incorporate the hierarchies in the charged fermion masses and mixings. The automatic existence of the heavy Majorana neutrinos generate the extremely small light neutrino masses through the seesaw mechanism, which is also responsible for producing the observed cosmological matter-antimatter asymmetry of the universe. We find interesting correlation between the low scale neutrino observables and the baryon asymmetry in this model. Baryon number violating nucleon decay processes mediated by the scalar diquarks and leptoquarks in this framework are found to be, $n,p\to \ell+m, \ell^c + m$ ($m=$ meson, $\ell=$ lepton, $\ell^c=$ antilepton) and $n,p\to \ell+\ell^c + \ell^c$. For some choice of the parameters of the theory, these decay rates can be within the observable range. Another baryon number violating process, the neutron-antineutron oscillation can also be in the observable range.
|
hep-ph/0101175
|
Giulia Zanderighi
|
Andrea Banfi, Giulia Zanderighi
|
Interplay between perturbative and non-perturbative QCD in three-jet
events
|
6 pages, 2 figures, talk given by G.Z. at the ISMD 2000 Conference,
to be published by the World Scientific Publishing Company, Singapore
| null | null | null |
hep-ph
| null |
We present the perturbative (PT) and non-perturbative (NP) analysis of the
cumulative out-of-event-plane momentum distribution in e+e- annihilation in the
near-to-planar three-jet region. A physical interpretation based on simple QCD
considerations and kinematical relations will be given, with the aim of
extending the described techniques to other multi-jet processes and, possibly,
to hadron-hadron collisions.
|
[
{
"created": "Tue, 16 Jan 2001 17:12:31 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Banfi",
"Andrea",
""
],
[
"Zanderighi",
"Giulia",
""
]
] |
We present the perturbative (PT) and non-perturbative (NP) analysis of the cumulative out-of-event-plane momentum distribution in e+e- annihilation in the near-to-planar three-jet region. A physical interpretation based on simple QCD considerations and kinematical relations will be given, with the aim of extending the described techniques to other multi-jet processes and, possibly, to hadron-hadron collisions.
|
hep-ph/0101080
|
Markus Diehl
|
Markus Diehl
|
Exclusive QCD
|
10 pages, Talk presented at RADCOR-2000, Carmel, CA, Sep. 2000.
Figure 4b corrected
| null | null |
DESY-01-001
|
hep-ph
| null |
I give a brief introduction to the physics of generalized parton
distributions and distribution amplitudes. I then report on the status of the
calculation of radiative corrections for the exclusive processes where these
quantities occur.
|
[
{
"created": "Tue, 9 Jan 2001 15:12:46 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Jan 2001 16:38:48 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Diehl",
"Markus",
""
]
] |
I give a brief introduction to the physics of generalized parton distributions and distribution amplitudes. I then report on the status of the calculation of radiative corrections for the exclusive processes where these quantities occur.
|
1712.08162
|
Valerio Bertone Dr
|
Valerio Bertone and Michiel Botje
|
A C++ interface to QCDNUM
|
6 pages
| null | null | null |
hep-ph cs.MS
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this document we report on the recent development of a C++ interface to
the FORTRAN-based evolution program QCDNUM. A short description of the
interface is given with a few basic examples of its usage.
|
[
{
"created": "Thu, 21 Dec 2017 08:20:43 GMT",
"version": "v1"
}
] |
2017-12-25
|
[
[
"Bertone",
"Valerio",
""
],
[
"Botje",
"Michiel",
""
]
] |
In this document we report on the recent development of a C++ interface to the FORTRAN-based evolution program QCDNUM. A short description of the interface is given with a few basic examples of its usage.
|
1008.0642
|
Christopher D. Carone
|
Christopher D. Carone, Joshua Erlich and Reinard Primulando (William
and Mary)
|
Decaying Dark Matter from Dark Instantons
|
19 pages LaTeX, 3 eps figures. v2,v3: references added
|
Phys.Rev.D82:055028,2010
|
10.1103/PhysRevD.82.055028
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We construct an explicit, TeV-scale model of decaying dark matter in which
the approximate stability of the dark matter candidate is a consequence of a
global symmetry that is broken only by instanton-induced operators generated by
a non-Abelian dark gauge group. The dominant dark matter decay channels are to
standard model leptons. Annihilation of the dark matter to standard model
states occurs primarily through the Higgs portal. We show that the mass and
lifetime of the dark matter candidate in this model can be chosen to be
consistent with the values favored by fits to data from the PAMELA and Fermi
LAT experiments.
|
[
{
"created": "Tue, 3 Aug 2010 20:00:37 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Aug 2010 01:30:11 GMT",
"version": "v2"
},
{
"created": "Wed, 22 Sep 2010 20:11:13 GMT",
"version": "v3"
}
] |
2014-11-21
|
[
[
"Carone",
"Christopher D.",
"",
"William\n and Mary"
],
[
"Erlich",
"Joshua",
"",
"William\n and Mary"
],
[
"Primulando",
"Reinard",
"",
"William\n and Mary"
]
] |
We construct an explicit, TeV-scale model of decaying dark matter in which the approximate stability of the dark matter candidate is a consequence of a global symmetry that is broken only by instanton-induced operators generated by a non-Abelian dark gauge group. The dominant dark matter decay channels are to standard model leptons. Annihilation of the dark matter to standard model states occurs primarily through the Higgs portal. We show that the mass and lifetime of the dark matter candidate in this model can be chosen to be consistent with the values favored by fits to data from the PAMELA and Fermi LAT experiments.
|
hep-ph/0011072
|
Hungchong Kim
|
Hungchong Kim, Su Houng Lee and Makoto Oka
|
Proper construction of the continuum in light-cone QCD sum rules
|
12 pages including 3 figures, substantially revised, version to be
published in Progress of Theoretical Physics
|
Prog.Theor.Phys. 109 (2003) 371-381
|
10.1143/PTP.109.371
| null |
hep-ph nucl-th
| null |
A proper way of subtracting the continuum contributions in light-cone QCD sum
rules (LCQSR) is demonstrated. Specifically, we calculate the continuum
corresponding to a typical OPE appearing in LCQSR by properly combining the
double dispersion relation with QCD duality. We demonstrate how the subtraction
terms can spuriously contribute to the sum rules. In the limit of zero external
momentum, taking out the spurious continuum is found to yield the sum rules
using the single-variable dispersion relation. The continuum factor constructed
in this way differs from the one appearing in usual LCQSR. The difference
substantially affects the extraction of hadronic parameters from the
correlation function involving baryon currents.
|
[
{
"created": "Mon, 6 Nov 2000 10:31:22 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Apr 2001 06:27:15 GMT",
"version": "v2"
},
{
"created": "Thu, 27 Feb 2003 01:51:17 GMT",
"version": "v3"
}
] |
2009-10-31
|
[
[
"Kim",
"Hungchong",
""
],
[
"Lee",
"Su Houng",
""
],
[
"Oka",
"Makoto",
""
]
] |
A proper way of subtracting the continuum contributions in light-cone QCD sum rules (LCQSR) is demonstrated. Specifically, we calculate the continuum corresponding to a typical OPE appearing in LCQSR by properly combining the double dispersion relation with QCD duality. We demonstrate how the subtraction terms can spuriously contribute to the sum rules. In the limit of zero external momentum, taking out the spurious continuum is found to yield the sum rules using the single-variable dispersion relation. The continuum factor constructed in this way differs from the one appearing in usual LCQSR. The difference substantially affects the extraction of hadronic parameters from the correlation function involving baryon currents.
|
hep-ph/0005228
|
Sanjay Reddy
|
Gregory W. Carter and Sanjay Reddy
|
Neutrino Propagation In Color Superconducting Quark Matter
|
12 pages, 5 figures
|
Phys.Rev. D62 (2000) 103002
|
10.1103/PhysRevD.62.103002
| null |
hep-ph astro-ph nucl-th
| null |
We calculate the neutrino mean free path in color superconducting quark
matter, and employ it to study the cooling of matter via neutrino diffusion in
the superconducting phase as compared to a free quark phase. The cooling
process slows when quark matter undergoes a second order phase transition to a
superconducting phase at the critical temperature $T_c$. Cooling subsequently
accelerates as the temperature decreases below $T_c$. This will directly impact
the early evolution of a newly born neutron star should its core contain quark
matter. Consequently, there may be observable changes in the early neutrino
emission which would provide evidence for superconductivity in hot and dense
matter.
|
[
{
"created": "Tue, 23 May 2000 21:35:12 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Carter",
"Gregory W.",
""
],
[
"Reddy",
"Sanjay",
""
]
] |
We calculate the neutrino mean free path in color superconducting quark matter, and employ it to study the cooling of matter via neutrino diffusion in the superconducting phase as compared to a free quark phase. The cooling process slows when quark matter undergoes a second order phase transition to a superconducting phase at the critical temperature $T_c$. Cooling subsequently accelerates as the temperature decreases below $T_c$. This will directly impact the early evolution of a newly born neutron star should its core contain quark matter. Consequently, there may be observable changes in the early neutrino emission which would provide evidence for superconductivity in hot and dense matter.
|
1606.09513
|
Leonard S. Kisslinger
|
Leonard S. Kisslinger, Debasish Das
|
$\Psi(2S)$ and $\Upsilon(3S)$ Suppression in p-Pb 8 TeV Collisions and
Mixed Heavy Quark Hybrid Mesons
|
5 pages,no figures
|
Int. J. Theoretical Physics, 55. 5152 (2016
|
10.1007/s10773-016-3136-2
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This brief report is an extension of a previus publication on $\Psi(2S)$ to
$J/\Psi(1S)$ suppression in p-Pb collisions at 5.02 TeV to estimate $\Psi(2S)$
to $J/\Psi(1S)$ and $\Upsilon(3S)$ to $\Upsilon(1S)$ suppression via p-Pb
collisions at 8 TeV as proposed by the LHCb.
|
[
{
"created": "Tue, 7 Jun 2016 17:17:55 GMT",
"version": "v1"
}
] |
2016-11-21
|
[
[
"Kisslinger",
"Leonard S.",
""
],
[
"Das",
"Debasish",
""
]
] |
This brief report is an extension of a previus publication on $\Psi(2S)$ to $J/\Psi(1S)$ suppression in p-Pb collisions at 5.02 TeV to estimate $\Psi(2S)$ to $J/\Psi(1S)$ and $\Upsilon(3S)$ to $\Upsilon(1S)$ suppression via p-Pb collisions at 8 TeV as proposed by the LHCb.
|
1404.2746
|
Angel Gomez Nicola
|
A. Gomez Nicola and R. Torres Andres
|
Electromagnetic effects in the pion dispersion relation at finite
temperature
|
28 pages, 7 figures. Version accepted for publication in Physical
Review D
|
Phys. Rev. D 89, 116009 (2014)
|
10.1103/PhysRevD.89.116009
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the charged-neutral pion self-energy difference at finite
temperature. Within Chiral Perturbation Theory we extend previous analysis in
the chiral and soft pion limits. Our analysis with physical masses leads to
additional contributions for temperatures typical of a meson gas, including a
momentum-dependent function for the self energy. In addition, a nonzero
imaginary part arises, which we define consistently in the Coulomb gauge and
comes from an infrared enhanced contribution due to thermal bath photons. For
distributions typical of a heavy-ion meson gas, the charged and neutral pion
masses and their difference depend on temperature through slowly increasing
functions. Chiral symmetry restoration is ultimately responsible for keeping
the corrections smooth and compatible with observed pion spectra. We study
phenomenological effects related to the electromagnetic damping leading to
corrections for transport coefficients and neutral-charged mean free times
differences. An important aspect is the connection with chiral symmetry
restoration through the relation of the pion mass difference with the
vector-axial spectral function difference, which holds at $T=0$ due to a sum
rule in the chiral and soft pion limits. We analyze the modifications of that
sum rule including nonzero pion masses and temperature, up to order $T^2$ and
$M_\pi^2$. Both effects produce terms making the pion mass difference grow
against chiral-restoring decreasing contributions. Finally, we analyze the
corrections to the previous ChPT and sum rule results within the resonance
saturation framework at finite temperature, including explicitly $\rho$ and
$a_1$ exchanges. Our results show that the ChPT result is robust at low and
intermediate temperatures, the leading corrections being of order $T^2
M_\pi^2/M_R^2$ with $M_R$ the involved resonance masses.
|
[
{
"created": "Thu, 10 Apr 2014 09:22:53 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Apr 2014 20:39:29 GMT",
"version": "v2"
},
{
"created": "Wed, 4 Jun 2014 06:01:44 GMT",
"version": "v3"
}
] |
2014-06-18
|
[
[
"Nicola",
"A. Gomez",
""
],
[
"Andres",
"R. Torres",
""
]
] |
We investigate the charged-neutral pion self-energy difference at finite temperature. Within Chiral Perturbation Theory we extend previous analysis in the chiral and soft pion limits. Our analysis with physical masses leads to additional contributions for temperatures typical of a meson gas, including a momentum-dependent function for the self energy. In addition, a nonzero imaginary part arises, which we define consistently in the Coulomb gauge and comes from an infrared enhanced contribution due to thermal bath photons. For distributions typical of a heavy-ion meson gas, the charged and neutral pion masses and their difference depend on temperature through slowly increasing functions. Chiral symmetry restoration is ultimately responsible for keeping the corrections smooth and compatible with observed pion spectra. We study phenomenological effects related to the electromagnetic damping leading to corrections for transport coefficients and neutral-charged mean free times differences. An important aspect is the connection with chiral symmetry restoration through the relation of the pion mass difference with the vector-axial spectral function difference, which holds at $T=0$ due to a sum rule in the chiral and soft pion limits. We analyze the modifications of that sum rule including nonzero pion masses and temperature, up to order $T^2$ and $M_\pi^2$. Both effects produce terms making the pion mass difference grow against chiral-restoring decreasing contributions. Finally, we analyze the corrections to the previous ChPT and sum rule results within the resonance saturation framework at finite temperature, including explicitly $\rho$ and $a_1$ exchanges. Our results show that the ChPT result is robust at low and intermediate temperatures, the leading corrections being of order $T^2 M_\pi^2/M_R^2$ with $M_R$ the involved resonance masses.
|
2208.11295
|
Debasish Borah
|
Devabrat Mahanta, Debasish Borah
|
WIMPy Leptogenesis in Non-Standard Cosmologies
|
50 pages, 21 captioned figures, matches version accepted for
publication in JCAP
| null |
10.1088/1475-7516/2023/03/049
| null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the possibility of generating baryon asymmetry of the universe from
dark matter (DM) annihilations during non-standard cosmological epochs.
Considering the DM to be of weakly interacting massive particle (WIMP) type,
the generation of baryon asymmetry via leptogenesis route is studied where WIMP
DM annihilation produces a non-zero lepton asymmetry. Adopting a minimal
particle physics model to realise this along with non-zero light neutrino
masses, we consider three different types of non-standard cosmic history
namely, (i) fast expanding universe, (ii) early matter domination and (iii)
scalar-tensor theory of gravity. By solving the appropriate Boltzmann equations
incorporating such non-standard history, we find that the allowed parameter
space consistent with DM relic and observed baryon asymmetry gets enlarged with
the possibility of lower DM mass in some scenarios. While such lighter DM can
face further scrutiny at direct search experiments, the non-standard epochs
offer complementary probes on their own.
|
[
{
"created": "Wed, 24 Aug 2022 04:20:00 GMT",
"version": "v1"
},
{
"created": "Sun, 5 Mar 2023 05:23:35 GMT",
"version": "v2"
}
] |
2023-03-29
|
[
[
"Mahanta",
"Devabrat",
""
],
[
"Borah",
"Debasish",
""
]
] |
We study the possibility of generating baryon asymmetry of the universe from dark matter (DM) annihilations during non-standard cosmological epochs. Considering the DM to be of weakly interacting massive particle (WIMP) type, the generation of baryon asymmetry via leptogenesis route is studied where WIMP DM annihilation produces a non-zero lepton asymmetry. Adopting a minimal particle physics model to realise this along with non-zero light neutrino masses, we consider three different types of non-standard cosmic history namely, (i) fast expanding universe, (ii) early matter domination and (iii) scalar-tensor theory of gravity. By solving the appropriate Boltzmann equations incorporating such non-standard history, we find that the allowed parameter space consistent with DM relic and observed baryon asymmetry gets enlarged with the possibility of lower DM mass in some scenarios. While such lighter DM can face further scrutiny at direct search experiments, the non-standard epochs offer complementary probes on their own.
|
1912.08420
|
Jun He Prof.
|
Jun He, Yi Liu, Jun-Tao Zhu, Dian-Yong Chen
|
Y(4626) as a molecular state from interaction
${D}^*_s\bar{D}_{s1}(2536)-{D}_s\bar{D}_{s1}(2536)$
|
7 pages, 2 figures
|
Eur.Phys.J.C 80 (2020) 3, 246
|
10.1140/epjc/s10052-020-7820-2
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recently, a new structure $Y(4626)$ was reported by the Belle Colloboration
in the process $e^+e^-\to D_s^+D_{s1}(2536)^-$. In this work, we propose an
assignment of the $Y(4626)$ as a ${D}^*_s\bar{D}_{s1}(2536)$ molecular state,
which decays into the $D_s^+D_{s1}(2536)^-$ channel through a coupling between
${D}^*_s\bar{D}_{s1}(2536)$ and ${D}_s\bar{D}_{s1}(2536)$ channels. With the
help of the heavy quark symmetry, the potential of the interaction
${D}^*_s\bar{D}_{s1}(2536)-{D}_s\bar{D}_{s1}(2536)$ is constructed within the
one-boson-exchange model, and inserted into the quasipotential Bethe-Salpeter
equation. The pole of obtained scattering amplitude is searched for in the
complex plane, which corresponds to a molecular state from the interaction
${D}^*_s\bar{D}_{s1}(2536)-{D}_s\bar{D}_{s1}(2536)$. The results suggest that a
pole is produced near the ${D}^*_s\bar{D}_{s1}(2536)$ threshold, which exhibits
as a peak in the invariant mass spectrum of the ${D}_s\bar{D}_{s1}(2536)$
channel at about 4626 MeV. It obviously favors the $Y(4265)$ as a
${D}^*_s\bar{D}_{s1}(2536)$ molecular state. In the same model, other molecular
states from the interaction ${D}^*_s\bar{D}_{s1}(2536)-{D}_s\bar{D}_{s1}(2536)$
are also predicted, which can be checked in future experiments.
|
[
{
"created": "Wed, 18 Dec 2019 07:35:53 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Jul 2020 10:27:57 GMT",
"version": "v2"
}
] |
2020-07-16
|
[
[
"He",
"Jun",
""
],
[
"Liu",
"Yi",
""
],
[
"Zhu",
"Jun-Tao",
""
],
[
"Chen",
"Dian-Yong",
""
]
] |
Recently, a new structure $Y(4626)$ was reported by the Belle Colloboration in the process $e^+e^-\to D_s^+D_{s1}(2536)^-$. In this work, we propose an assignment of the $Y(4626)$ as a ${D}^*_s\bar{D}_{s1}(2536)$ molecular state, which decays into the $D_s^+D_{s1}(2536)^-$ channel through a coupling between ${D}^*_s\bar{D}_{s1}(2536)$ and ${D}_s\bar{D}_{s1}(2536)$ channels. With the help of the heavy quark symmetry, the potential of the interaction ${D}^*_s\bar{D}_{s1}(2536)-{D}_s\bar{D}_{s1}(2536)$ is constructed within the one-boson-exchange model, and inserted into the quasipotential Bethe-Salpeter equation. The pole of obtained scattering amplitude is searched for in the complex plane, which corresponds to a molecular state from the interaction ${D}^*_s\bar{D}_{s1}(2536)-{D}_s\bar{D}_{s1}(2536)$. The results suggest that a pole is produced near the ${D}^*_s\bar{D}_{s1}(2536)$ threshold, which exhibits as a peak in the invariant mass spectrum of the ${D}_s\bar{D}_{s1}(2536)$ channel at about 4626 MeV. It obviously favors the $Y(4265)$ as a ${D}^*_s\bar{D}_{s1}(2536)$ molecular state. In the same model, other molecular states from the interaction ${D}^*_s\bar{D}_{s1}(2536)-{D}_s\bar{D}_{s1}(2536)$ are also predicted, which can be checked in future experiments.
|
0711.0200
|
Georg Weiglein
|
Georg Weiglein
|
SUSY in the Light of B Physics and Electroweak Precision Observables
|
4 pages, submitted for the SUSY07 proceedings
| null | null |
IPPP/07/77, DCPT/07/154
|
hep-ph
| null |
Indirect information about the possible scale of supersymmetry (SUSY)
breaking can be obtained from the comparison of precisely measured observables
(and also of exclusion limits) with accurate theory predictions incorporating
SUSY loop corrections. Recent results are reviewed obtained from a combined
analysis of the most sensitive electroweak precision observables (EWPO), M_W,
sin^2_theta^eff, Gamma_Z, (g-2)_\mu and M_h, and B-physics observables (BPO),
BR(b -> s \gamma), BR(B_s -> \mu^+\mu^-), BR(B_u -> \tau \nu_\tau) and \Delta
M_{B_s}. Assuming that the lightest supersymmetric particle (LSP) provides the
cold dark matter density preferred by WMAP and other cosmological data, \chi^2
fits are performed to the parameters of the constrained minimal supersymmetric
extension of the Standard Model (CMSSM), in which the SUSY-breaking parameters
are universal at the GUT scale, and the non-universal Higgs model (NUHM), in
which this constraint is relaxed for the soft SUSY-breaking contributions to
the Higgs masses. Within the CMSSM indirect bounds on the mass of the lightest
CP-even Higgs boson are derived.
|
[
{
"created": "Thu, 1 Nov 2007 19:33:12 GMT",
"version": "v1"
}
] |
2007-11-02
|
[
[
"Weiglein",
"Georg",
""
]
] |
Indirect information about the possible scale of supersymmetry (SUSY) breaking can be obtained from the comparison of precisely measured observables (and also of exclusion limits) with accurate theory predictions incorporating SUSY loop corrections. Recent results are reviewed obtained from a combined analysis of the most sensitive electroweak precision observables (EWPO), M_W, sin^2_theta^eff, Gamma_Z, (g-2)_\mu and M_h, and B-physics observables (BPO), BR(b -> s \gamma), BR(B_s -> \mu^+\mu^-), BR(B_u -> \tau \nu_\tau) and \Delta M_{B_s}. Assuming that the lightest supersymmetric particle (LSP) provides the cold dark matter density preferred by WMAP and other cosmological data, \chi^2 fits are performed to the parameters of the constrained minimal supersymmetric extension of the Standard Model (CMSSM), in which the SUSY-breaking parameters are universal at the GUT scale, and the non-universal Higgs model (NUHM), in which this constraint is relaxed for the soft SUSY-breaking contributions to the Higgs masses. Within the CMSSM indirect bounds on the mass of the lightest CP-even Higgs boson are derived.
|
1209.3554
|
Yongseok Oh
|
Yong-Liang Ma, Ghil-Seok Yang, Yongseok Oh, Masayasu Harada
|
Skyrmions with vector mesons in the hidden local symmetry approach
|
REVTeX, 17 pages, 10 figures, to be published in Phys. Rev. D
|
Phys.Rev.D87:034023,2013
|
10.1103/PhysRevD.87.034023
| null |
hep-ph hep-th nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The roles of light $\rho$ and $\omega$ vector mesons in the Skyrmion are
investigated in a chiral Lagrangian derived from the hidden local symmetry
(HLS) up to $O(p^4)$ including the homogeneous Wess-Zumino (hWZ) terms. We
write a general "master formula" that allows us to determine the parameters of
the HLS Lagrangian from a class of holographic QCD models valid at large $N_c$
and $\lambda$ ('t Hooft constant) limit by integrating out the infinite towers
of vector and axial-vector mesons other than the lowest $\rho$ and $\omega$
mesons. Within this approach we find that the physical properties of the
Skyrmion as the solitonic description of baryons are \textit{independent} of
the HLS parameter $a$. Therefore the only parameters of the model are the pion
decay constant and the vector meson mass. Once determined in the meson sector,
we have a totally parameter-free theory that allows us to study unequivocally
the role of light vector mesons in the Skyrmion structure. We find, as
suggested by Sutcliffe, that inclusion of the $\rho$ meson reduces the soliton
mass, which makes the Skyrmion come closer to the
Bogomol'nyi-Prasad-Sommerfield (BPS) soliton, but the role of the $\omega$
meson is found to increase the soliton mass. In a stark contrast, the
$\Delta$-$N$ mass difference, which is determined by the moment of inertia in
adiabatic collective quantization of the Skyrmion, is increased by the $\rho$
vector meson, while it is reduced by the inclusion of the $\omega$ meson. All
these observations show the importance of the $\omega$ meson in the properties
of the nucleon and nuclear matter in the Skyrme model.
|
[
{
"created": "Mon, 17 Sep 2012 05:24:30 GMT",
"version": "v1"
},
{
"created": "Sun, 3 Feb 2013 06:38:25 GMT",
"version": "v2"
}
] |
2015-06-11
|
[
[
"Ma",
"Yong-Liang",
""
],
[
"Yang",
"Ghil-Seok",
""
],
[
"Oh",
"Yongseok",
""
],
[
"Harada",
"Masayasu",
""
]
] |
The roles of light $\rho$ and $\omega$ vector mesons in the Skyrmion are investigated in a chiral Lagrangian derived from the hidden local symmetry (HLS) up to $O(p^4)$ including the homogeneous Wess-Zumino (hWZ) terms. We write a general "master formula" that allows us to determine the parameters of the HLS Lagrangian from a class of holographic QCD models valid at large $N_c$ and $\lambda$ ('t Hooft constant) limit by integrating out the infinite towers of vector and axial-vector mesons other than the lowest $\rho$ and $\omega$ mesons. Within this approach we find that the physical properties of the Skyrmion as the solitonic description of baryons are \textit{independent} of the HLS parameter $a$. Therefore the only parameters of the model are the pion decay constant and the vector meson mass. Once determined in the meson sector, we have a totally parameter-free theory that allows us to study unequivocally the role of light vector mesons in the Skyrmion structure. We find, as suggested by Sutcliffe, that inclusion of the $\rho$ meson reduces the soliton mass, which makes the Skyrmion come closer to the Bogomol'nyi-Prasad-Sommerfield (BPS) soliton, but the role of the $\omega$ meson is found to increase the soliton mass. In a stark contrast, the $\Delta$-$N$ mass difference, which is determined by the moment of inertia in adiabatic collective quantization of the Skyrmion, is increased by the $\rho$ vector meson, while it is reduced by the inclusion of the $\omega$ meson. All these observations show the importance of the $\omega$ meson in the properties of the nucleon and nuclear matter in the Skyrme model.
|
1007.1993
|
Gino Isidori
|
Andrzej J. Buras, Katrin Gemmler, Gino Isidori
|
Quark flavour mixing with right-handed currents: an effective theory
approach
|
39 pages, 3 figs
| null |
10.1016/j.nuclphysb.2010.09.021
|
TUM-HEP-765/10
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The impact of right-handed currents in both charged- and neutral-current
flavour-violating processes is analysed by means of an effective theory
approach. More explicitly, we analyse the structure of dimension-six operators
assuming a left-right symmetric flavour group, commuting with an underlying
$SU(2)_L \times SU(2)_R \times U(1)_{B-L}$ global symmetry, broken only by two
Yukawa couplings. The model contains a new unitary matrix controlling
flavour-mixing in the right-handed sector. We determine the structure of this
matrix by charged-current data, where the tension between inclusive and
exclusive determinations of $|V_{ub}|$ can be solved. Having determined the
size and the flavour structure of right-handed currents, we investigate how
they would manifest themselves in neutral current processes, including
particle-antiparticle mixing, $Z\to b \bar b$, $B_{s,d}\to \mu^+\mu^-$, $B\to
{Xs,K,K*} \nu\bar\nu$, and $K\to \pi\nu\bar\nu$ decays. The possibility to
explain a non-standard CP-violating phase in $B_s$ mixing in this context, and
the comparison with other predictive new-physics frameworks addressing the same
problem, is also discussed. While a large $S_{\psi \phi}$ asymmetry can easily
be accommodated, we point out a tension in this framework between $|V_{ub}|$
and $S_{\psi K}$.
|
[
{
"created": "Mon, 12 Jul 2010 20:54:45 GMT",
"version": "v1"
}
] |
2015-05-19
|
[
[
"Buras",
"Andrzej J.",
""
],
[
"Gemmler",
"Katrin",
""
],
[
"Isidori",
"Gino",
""
]
] |
The impact of right-handed currents in both charged- and neutral-current flavour-violating processes is analysed by means of an effective theory approach. More explicitly, we analyse the structure of dimension-six operators assuming a left-right symmetric flavour group, commuting with an underlying $SU(2)_L \times SU(2)_R \times U(1)_{B-L}$ global symmetry, broken only by two Yukawa couplings. The model contains a new unitary matrix controlling flavour-mixing in the right-handed sector. We determine the structure of this matrix by charged-current data, where the tension between inclusive and exclusive determinations of $|V_{ub}|$ can be solved. Having determined the size and the flavour structure of right-handed currents, we investigate how they would manifest themselves in neutral current processes, including particle-antiparticle mixing, $Z\to b \bar b$, $B_{s,d}\to \mu^+\mu^-$, $B\to {Xs,K,K*} \nu\bar\nu$, and $K\to \pi\nu\bar\nu$ decays. The possibility to explain a non-standard CP-violating phase in $B_s$ mixing in this context, and the comparison with other predictive new-physics frameworks addressing the same problem, is also discussed. While a large $S_{\psi \phi}$ asymmetry can easily be accommodated, we point out a tension in this framework between $|V_{ub}|$ and $S_{\psi K}$.
|
1512.05359
|
David McKeen
|
David McKeen, Ann E. Nelson
|
CP Violating Baryon Oscillations
|
8 pages, 2 figures. v2: version to appear in PRD
|
Phys. Rev. D 94, 076002 (2016)
|
10.1103/PhysRevD.94.076002
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We enumerate the conditions necessary for $CP$ violation to be manifest in
$n$-$\bar n$ oscillations, and build a simple model that can give rise to such
effects. We discuss a possible connection between neutron oscillations and dark
matter, provided the mass of the latter lies between $m_p-m_e$ and $m_p+m_e$.
We apply our results to a possible baryogenesis scenario involving $CP$
violation in the oscillations of the $\Xi^0$.
|
[
{
"created": "Wed, 16 Dec 2015 21:00:06 GMT",
"version": "v1"
},
{
"created": "Sun, 11 Sep 2016 03:02:17 GMT",
"version": "v2"
}
] |
2016-10-12
|
[
[
"McKeen",
"David",
""
],
[
"Nelson",
"Ann E.",
""
]
] |
We enumerate the conditions necessary for $CP$ violation to be manifest in $n$-$\bar n$ oscillations, and build a simple model that can give rise to such effects. We discuss a possible connection between neutron oscillations and dark matter, provided the mass of the latter lies between $m_p-m_e$ and $m_p+m_e$. We apply our results to a possible baryogenesis scenario involving $CP$ violation in the oscillations of the $\Xi^0$.
|
1310.7579
|
Archana Anandakrishnan
|
Archana Anandakrishnan, Kuver Sinha
|
On the Viability of Thermal Well-Tempered Dark Matter in SUSY GUTs
|
Minor updates and added references
|
Phys. Rev. D 89, 055015 (2014)
|
10.1103/PhysRevD.89.055015
|
OHSTPY-HEP-T-13-005
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In a scenario with heavy supersymmetric sfermions and decoupled
supersymmetric Higgs sector, a well tempered neutralino is the remaining
candidate for thermal single-component sub-TeV dark matter. Well tempered
neutralinos are studied in the context of supersymmetric grand unified theories
with third family Yukawa coupling unification. A global chi^2 analysis is
performed, including the observables MW, MZ, GF, alpha_em, alpha_s(MZ), Mt,
mb(mb), Mtau, b -> s gamma, BR(Bs -> mu^+ mu^-), Mh and Omegah^2. Tensions in
simultaneously fitting the Higgs and bottom quark masses while also avoiding
gluino mass bounds from the LHC disfavors light Higgsinos with mass < 500 GeV,
ruling out light Bino/Higgsino dark matter candidates. Bino/Wino/Higgsino and
Bino/Wino candidates fare somewhat better although they are fine-tuned and
require departure from GUT scale gaugino mass universality (the example chosen
here is the mixed modulus-anomaly pattern). Implications for dark matter direct
detection of these models as well as collider signatures are briefly discussed.
Independent of the thermal dark matter viability, these models will be severely
constrained by the absence of a gluino at the next run of LHC.
|
[
{
"created": "Mon, 28 Oct 2013 20:00:00 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Nov 2013 18:16:39 GMT",
"version": "v2"
}
] |
2014-03-26
|
[
[
"Anandakrishnan",
"Archana",
""
],
[
"Sinha",
"Kuver",
""
]
] |
In a scenario with heavy supersymmetric sfermions and decoupled supersymmetric Higgs sector, a well tempered neutralino is the remaining candidate for thermal single-component sub-TeV dark matter. Well tempered neutralinos are studied in the context of supersymmetric grand unified theories with third family Yukawa coupling unification. A global chi^2 analysis is performed, including the observables MW, MZ, GF, alpha_em, alpha_s(MZ), Mt, mb(mb), Mtau, b -> s gamma, BR(Bs -> mu^+ mu^-), Mh and Omegah^2. Tensions in simultaneously fitting the Higgs and bottom quark masses while also avoiding gluino mass bounds from the LHC disfavors light Higgsinos with mass < 500 GeV, ruling out light Bino/Higgsino dark matter candidates. Bino/Wino/Higgsino and Bino/Wino candidates fare somewhat better although they are fine-tuned and require departure from GUT scale gaugino mass universality (the example chosen here is the mixed modulus-anomaly pattern). Implications for dark matter direct detection of these models as well as collider signatures are briefly discussed. Independent of the thermal dark matter viability, these models will be severely constrained by the absence of a gluino at the next run of LHC.
|
hep-ph/9903445
| null |
S.V. Molodtsov, A.M. Snigirev, G.M. Zinovjev
|
Towards Phonon-Like Excitations of Instanton Liquid
|
6 pages Rep. no:
|
Phys.Rev. D60 (1999) 056006
|
10.1103/PhysRevD.60.056006
| null |
hep-ph hep-lat hep-th nucl-th
| null |
The phonon-like excitations of (anti)-instanton ($\bar II$) liquid due to
adiabatic variations of vacuum wave functions are studied in this paper. The
kinetic energy term is found and the proper effective Lagrangian for such
excitations is evaluated. The properties of their spectrum, while corresponding
masses are defined by $\Lambda_{QCD}$, are investigated.
|
[
{
"created": "Mon, 22 Mar 1999 15:02:38 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Molodtsov",
"S. V.",
""
],
[
"Snigirev",
"A. M.",
""
],
[
"Zinovjev",
"G. M.",
""
]
] |
The phonon-like excitations of (anti)-instanton ($\bar II$) liquid due to adiabatic variations of vacuum wave functions are studied in this paper. The kinetic energy term is found and the proper effective Lagrangian for such excitations is evaluated. The properties of their spectrum, while corresponding masses are defined by $\Lambda_{QCD}$, are investigated.
|
0711.2789
|
Antonio M. Garcia-Garcia
|
Antonio M. Garcia-Garcia, James C. Osborn
|
Is the chiral phase transition induced by a metal-insulator transition?
|
5 pages, 4 figures. Contributions to the proceedings of ``Infrared
QCD in Rio: Propagators, Condensates and Topological Effects (IRQCD 2006)'',
Rio de Janeiro, Brazil, 5-9 Jun 2006
|
Braz.J.Phys.37:246-250,2007
| null | null |
hep-ph
| null |
We investigate the QCD Dirac operator with gauge configurations given by a
liquid of instantons in the region of temperatures about the chiral phase
transition. Both the quenched and unquenched cases are examined in detail. We
present evidence of a localization transition in the low lying modes of the
Dirac operator around the same temperature as the chiral phase transition.
Thus both level statistics and eigenvectors of the QCD Dirac operator at the
chiral phase transition have similar properties than those of a disordered
conductor at the metal-insulator transition. This strongly suggests the
phenomenon of Anderson localization (localization by destructive quantum
interference) is the leading physical mechanism in the restoration of the
chiral symmetry. Finally we argue that our findings are not in principle
restricted to the ILM approximation and may also be found in lattice
simulations.
|
[
{
"created": "Sun, 18 Nov 2007 15:07:44 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Garcia-Garcia",
"Antonio M.",
""
],
[
"Osborn",
"James C.",
""
]
] |
We investigate the QCD Dirac operator with gauge configurations given by a liquid of instantons in the region of temperatures about the chiral phase transition. Both the quenched and unquenched cases are examined in detail. We present evidence of a localization transition in the low lying modes of the Dirac operator around the same temperature as the chiral phase transition. Thus both level statistics and eigenvectors of the QCD Dirac operator at the chiral phase transition have similar properties than those of a disordered conductor at the metal-insulator transition. This strongly suggests the phenomenon of Anderson localization (localization by destructive quantum interference) is the leading physical mechanism in the restoration of the chiral symmetry. Finally we argue that our findings are not in principle restricted to the ILM approximation and may also be found in lattice simulations.
|
hep-ph/9306263
| null |
G.E. Forden, DZERO Collaboration
|
The Search for Large Rapidity Gaps Between Jets by DZERO
|
3 pages, AZPH-EXP/93-01
| null | null | null |
hep-ph
| null |
We have searched for high Pt (>40 GeV/c) jet events in ppbar collisions at
the Fermilab TEVATRON (S**1/2 = 1800 GeV/c2) which have large pseudo-rapidity
differences between the jets and are consistent with zero particle production
from the underlying event. Preliminary analysis indicates that a significant
fraction of these events with "voids" are present. (3 pages of plain text, 7
Figures available on request from the author)
|
[
{
"created": "Fri, 11 Jun 1993 16:00:00 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Forden",
"G. E.",
""
],
[
"Collaboration",
"DZERO",
""
]
] |
We have searched for high Pt (>40 GeV/c) jet events in ppbar collisions at the Fermilab TEVATRON (S**1/2 = 1800 GeV/c2) which have large pseudo-rapidity differences between the jets and are consistent with zero particle production from the underlying event. Preliminary analysis indicates that a significant fraction of these events with "voids" are present. (3 pages of plain text, 7 Figures available on request from the author)
|
2302.09889
|
Narmin Nasibova
|
Narmin Nasibova
|
Isospin symmetry of $\omega$ meson in the soft-wall model of holographic
QCD at finite temperature
|
19 pages, 11 figures. arXiv admin note: text overlap with
arXiv:2103.10494
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Coupling constants of $\rho$- and $\omega$- meson-nucleon are related with
each other by isospin relation. In present work, it is aimed at studying the
violation (if it exists) of isospin symmetry of the $\omega$-meson and to study
the temperature dependence of $\omega$-meson-nucleon-delta and
$\omega$-meson-delta coupling constants using the soft-wall model of
holographic QCD. Firstly, the coupling constants are obtained by applying the
profile functions of the vector and fermion fields to the model at a finite
temperature. The interaction Lagrangian is written, including the minimum and
magnetic interactions of vector and fermion fields which is defined in the bulk
of the 5-dimensional AdS space-time. Secondly, the temperature dependence of
the coupling constants $g_{\omega N N}(T)$, $g_{\omega \Delta \Delta}(T)$ and
$g_{\omega N \Delta}(T)$ has been plotted. Comparing $g_{\omega N N}(T)$ with
the coupling constant $g_{\rho NN}(T)$, it obtained that the isospin symmetry
of the omega meson is not violated at the finite temperature. It is also
observed that the coupling constants of the $\omega$ vector meson with baryons
decreases with increasing temperature, and this coupling constant becomes zero
near the Hawking phase transition temperature.
|
[
{
"created": "Mon, 20 Feb 2023 10:36:02 GMT",
"version": "v1"
}
] |
2023-02-21
|
[
[
"Nasibova",
"Narmin",
""
]
] |
Coupling constants of $\rho$- and $\omega$- meson-nucleon are related with each other by isospin relation. In present work, it is aimed at studying the violation (if it exists) of isospin symmetry of the $\omega$-meson and to study the temperature dependence of $\omega$-meson-nucleon-delta and $\omega$-meson-delta coupling constants using the soft-wall model of holographic QCD. Firstly, the coupling constants are obtained by applying the profile functions of the vector and fermion fields to the model at a finite temperature. The interaction Lagrangian is written, including the minimum and magnetic interactions of vector and fermion fields which is defined in the bulk of the 5-dimensional AdS space-time. Secondly, the temperature dependence of the coupling constants $g_{\omega N N}(T)$, $g_{\omega \Delta \Delta}(T)$ and $g_{\omega N \Delta}(T)$ has been plotted. Comparing $g_{\omega N N}(T)$ with the coupling constant $g_{\rho NN}(T)$, it obtained that the isospin symmetry of the omega meson is not violated at the finite temperature. It is also observed that the coupling constants of the $\omega$ vector meson with baryons decreases with increasing temperature, and this coupling constant becomes zero near the Hawking phase transition temperature.
|
1605.08267
|
Diego Aristizabal
|
D. Aristizabal Sierra, C. Simoes, D. Wegman
|
Radiative accidental matter
|
24 pages, 6 figures, 4 tables. Few typos corrected and references
added
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Accidental matter models are scenarios where the beyond-the-standard model
physics preserves all the standard model accidental and approximate symmetries
up to a cutoff scale related with lepton number violation. We study such
scenarios assuming that the new physics plays an active role in neutrino mass
generation, and show that this unavoidably leads to radiatively induced
neutrino masses. We systematically classify all possible models and determine
their viability by studying electroweak precision data, big bang
nucleosynthesis and electroweak perturbativity, finding that the latter places
the most stringent constraints on the mass spectra. These results allow the
identification of minimal radiative accidental matter models for which
perturbativity is lost at high scales. We calculate radiative charged-lepton
flavor violating processes in these setups, and show that $\mu\to e \gamma$ has
a rate well within MEG sensitivity provided the lepton-number violating scale
is at or below $10^6$ GeV, a value (naturally) assured by the radiative
suppression mechanism. Sizeable $\tau\to \mu \gamma$ branching fractions within
SuperKEKB sensitivity are possible for lower lepton-number breaking scales. We
thus point out that these scenarios can be tested not only in direct searches
but also in lepton-flavor violating experiments.
|
[
{
"created": "Thu, 26 May 2016 13:28:03 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Jun 2016 21:44:53 GMT",
"version": "v2"
}
] |
2016-06-15
|
[
[
"Sierra",
"D. Aristizabal",
""
],
[
"Simoes",
"C.",
""
],
[
"Wegman",
"D.",
""
]
] |
Accidental matter models are scenarios where the beyond-the-standard model physics preserves all the standard model accidental and approximate symmetries up to a cutoff scale related with lepton number violation. We study such scenarios assuming that the new physics plays an active role in neutrino mass generation, and show that this unavoidably leads to radiatively induced neutrino masses. We systematically classify all possible models and determine their viability by studying electroweak precision data, big bang nucleosynthesis and electroweak perturbativity, finding that the latter places the most stringent constraints on the mass spectra. These results allow the identification of minimal radiative accidental matter models for which perturbativity is lost at high scales. We calculate radiative charged-lepton flavor violating processes in these setups, and show that $\mu\to e \gamma$ has a rate well within MEG sensitivity provided the lepton-number violating scale is at or below $10^6$ GeV, a value (naturally) assured by the radiative suppression mechanism. Sizeable $\tau\to \mu \gamma$ branching fractions within SuperKEKB sensitivity are possible for lower lepton-number breaking scales. We thus point out that these scenarios can be tested not only in direct searches but also in lepton-flavor violating experiments.
|
1405.6078
|
Tuomas Hapola
|
Tuomas Hapola
|
Higgs Boson with Multiple Jets
|
4 pages, 5 figures, contribution to 49th Rencontres de Moriond on QCD
and High Energy Interactions (Moriond QCD 2014)
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The High Energy Jets (HEJ) framework accounts for large logarithms arising
from the wide angle hard gluon emissions. The resummation in HEJ is based on an
approximation to allow fast evaluation for arbitrary multiplicity. The
approximation is motivated by the high energy limit and as such captures the
leading logarithmic corrections in large invariant mass between the partons.
These corrections are important when there is a large separation in rapidity
between the produced jets. This situation arises in a Higgs boson plus jets
analysis. Furthermore, HEJ includes matching to full tree level accuracy up to
four jets. This talk will introduce the HEJ framework and discuss advances in
the formal accuracy attained within HEJ, and the application to predictions for
the production of Higgs boson plus jets.
|
[
{
"created": "Fri, 23 May 2014 14:40:01 GMT",
"version": "v1"
}
] |
2014-05-26
|
[
[
"Hapola",
"Tuomas",
""
]
] |
The High Energy Jets (HEJ) framework accounts for large logarithms arising from the wide angle hard gluon emissions. The resummation in HEJ is based on an approximation to allow fast evaluation for arbitrary multiplicity. The approximation is motivated by the high energy limit and as such captures the leading logarithmic corrections in large invariant mass between the partons. These corrections are important when there is a large separation in rapidity between the produced jets. This situation arises in a Higgs boson plus jets analysis. Furthermore, HEJ includes matching to full tree level accuracy up to four jets. This talk will introduce the HEJ framework and discuss advances in the formal accuracy attained within HEJ, and the application to predictions for the production of Higgs boson plus jets.
|
1110.6582
|
Artem Lipatov
|
A.V. Lipatov, M.A. Malyshev, N.P. Zotov
|
Drell-Yan lepton pair production at high energies in the
kt-factorization approach
|
14 pages, 6 figures
|
JHEP 12, 117 (2011)
|
10.1007/JHEP12(2011)117
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the framework of the kt-factorization approach, the production of
unpolarized Drell-Yan lepton pair at high energies is studied. The
consideration is based on the O(alpha) and $O(alpha alpha_s) off-shell partonic
matrix elements with virtual photon and Z boson exchange. The calculations
include leptonic decays of Z bosons with full spin correlations as well as
gamma - Z interference. The unintegrated parton densities in a proton are
determined by the Kimber-Martin-Ryskin prescription. Our numerical predictions
are compared with the data taken by the D0, CDF and CMS collaborations at the
Tevatron and LHC energies. Special attention is put on the specific angular
distributions measured very recently by the CDF collaboration for the first
time.
|
[
{
"created": "Sun, 30 Oct 2011 06:21:51 GMT",
"version": "v1"
}
] |
2015-06-03
|
[
[
"Lipatov",
"A. V.",
""
],
[
"Malyshev",
"M. A.",
""
],
[
"Zotov",
"N. P.",
""
]
] |
In the framework of the kt-factorization approach, the production of unpolarized Drell-Yan lepton pair at high energies is studied. The consideration is based on the O(alpha) and $O(alpha alpha_s) off-shell partonic matrix elements with virtual photon and Z boson exchange. The calculations include leptonic decays of Z bosons with full spin correlations as well as gamma - Z interference. The unintegrated parton densities in a proton are determined by the Kimber-Martin-Ryskin prescription. Our numerical predictions are compared with the data taken by the D0, CDF and CMS collaborations at the Tevatron and LHC energies. Special attention is put on the specific angular distributions measured very recently by the CDF collaboration for the first time.
|
hep-ph/0403012
|
Bohdan Grzadkowski
|
Patrizia Bucci, Bohdan Grzadkowski, Zygmunt Lalak and Radoslaw
Matyszkiewicz
|
Electroweak symmetry breaking and radion stabilization in universal
extra dimensions
|
20 pages, 2 figures, references added
|
JHEP 0404 (2004) 067
|
10.1088/1126-6708/2004/04/067
|
CERN-PH-TH/2004-036, IFT-2004-08
|
hep-ph
| null |
We discuss the stabilization of the scalar sector, including the radion, in
the gauge model with one universal extra dimension, within Higgs and Higgsless
scenarios. The stabilization occurs at the one-loop level, through the
fermionic contribution to the effective potential; in the Higgs case, for
stabilization to take place the bosonic contribution must be balanced by the
fermionic one, hence the scales of these two cannot differ too much. However,
there is no need for (softly broken) supersymmetry to achieve the stabilization
- it can be arranged for a reasonably wide range of couplings and mass scales.
The primary instability in the model is the run-away of the radion vacuum
expectation value. It turns out that the requirement of the radion stability,
in the Higgs case, favours a Higgs boson mass below 0.26 TeV, which is
consistent with the Standard Model upper bound that follows from the
electroweak precision measurements. The typical radion mass is of the order of
10^{-6} eV. The radion mass can be made larger by rising the scale of fermion
masses, as clearly seen in the Higgsless case. The cosmological constant may be
cancelled by suitable counterterms, in such a way that the stabilization is not
affected.
|
[
{
"created": "Mon, 1 Mar 2004 17:13:58 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Mar 2004 13:36:55 GMT",
"version": "v2"
}
] |
2009-11-10
|
[
[
"Bucci",
"Patrizia",
""
],
[
"Grzadkowski",
"Bohdan",
""
],
[
"Lalak",
"Zygmunt",
""
],
[
"Matyszkiewicz",
"Radoslaw",
""
]
] |
We discuss the stabilization of the scalar sector, including the radion, in the gauge model with one universal extra dimension, within Higgs and Higgsless scenarios. The stabilization occurs at the one-loop level, through the fermionic contribution to the effective potential; in the Higgs case, for stabilization to take place the bosonic contribution must be balanced by the fermionic one, hence the scales of these two cannot differ too much. However, there is no need for (softly broken) supersymmetry to achieve the stabilization - it can be arranged for a reasonably wide range of couplings and mass scales. The primary instability in the model is the run-away of the radion vacuum expectation value. It turns out that the requirement of the radion stability, in the Higgs case, favours a Higgs boson mass below 0.26 TeV, which is consistent with the Standard Model upper bound that follows from the electroweak precision measurements. The typical radion mass is of the order of 10^{-6} eV. The radion mass can be made larger by rising the scale of fermion masses, as clearly seen in the Higgsless case. The cosmological constant may be cancelled by suitable counterterms, in such a way that the stabilization is not affected.
|
1704.01804
|
Edward Hardy
|
Bobby Samir Acharya, Malcolm Fairbairn, Edward Hardy
|
Glueball dark matter in non-standard cosmologies
|
28 pages, 3 figures, JHEP version
| null | null | null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Hidden sector glueball dark matter is well motivated by string theory,
compactifications of which often have extra gauge groups uncoupled to the
visible sector. We study the dynamics of glueballs in theories with a period of
late time primordial matter domination followed by a low final reheating
temperature due to a gravitationally coupled modulus. Compared to scenarios
with a high reheating temperature, the required relic abundance is possible
with higher hidden sector confinement scales, and less extreme differences in
the entropy densities of the hidden and visible sectors. Both of these can
occur in string derived models, and relatively light moduli are helpful for
obtaining viable phenomenology. We also study the effects of hidden sector
gluinos. In some parts of parameter space these can be the dominant dark matter
component, while in others their abundance is much smaller than that of
glueballs. Finally, we show that heavy glueballs produced from energy in the
hidden sector prior to matter domination can have the correct relic abundance
if they are sufficiently long lived.
|
[
{
"created": "Thu, 6 Apr 2017 12:25:48 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Aug 2017 21:53:23 GMT",
"version": "v2"
}
] |
2017-08-16
|
[
[
"Acharya",
"Bobby Samir",
""
],
[
"Fairbairn",
"Malcolm",
""
],
[
"Hardy",
"Edward",
""
]
] |
Hidden sector glueball dark matter is well motivated by string theory, compactifications of which often have extra gauge groups uncoupled to the visible sector. We study the dynamics of glueballs in theories with a period of late time primordial matter domination followed by a low final reheating temperature due to a gravitationally coupled modulus. Compared to scenarios with a high reheating temperature, the required relic abundance is possible with higher hidden sector confinement scales, and less extreme differences in the entropy densities of the hidden and visible sectors. Both of these can occur in string derived models, and relatively light moduli are helpful for obtaining viable phenomenology. We also study the effects of hidden sector gluinos. In some parts of parameter space these can be the dominant dark matter component, while in others their abundance is much smaller than that of glueballs. Finally, we show that heavy glueballs produced from energy in the hidden sector prior to matter domination can have the correct relic abundance if they are sufficiently long lived.
|
hep-ph/9908486
|
Masaaki Kuroda
|
Y. Kurihara (KEK), M. Kuroda (Meiji-Gakuin University) D. Schildknecht
(Bielefeld University)
|
High-Energy Cross Section for e^+e^- to W^+ W^- to 4 fermions + gamma
|
20 pages, Latex
|
Nucl.Phys. B565 (2000) 49-68
|
10.1016/S0550-3213(99)00671-9
|
BI-TP 99/30
|
hep-ph
| null |
A recently suggested high-energy Born-form representation of the one-loop
helicity amplitudes for e^+e^- to W^+W^- is supplemented by including W^+-
decay and hard-photon radiation. Results for the differential and the total
cross section for e^+e^- to W^+W^- to 4 fermions + gamma are given for the
high-energy region of sqrt(s) > 500 GeV.
|
[
{
"created": "Fri, 27 Aug 1999 14:01:32 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Oct 1999 01:22:06 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Kurihara",
"Y.",
"",
"KEK"
],
[
"Kuroda",
"M.",
"",
"Meiji-Gakuin University"
],
[
"Schildknecht",
"D.",
"",
"Bielefeld University"
]
] |
A recently suggested high-energy Born-form representation of the one-loop helicity amplitudes for e^+e^- to W^+W^- is supplemented by including W^+- decay and hard-photon radiation. Results for the differential and the total cross section for e^+e^- to W^+W^- to 4 fermions + gamma are given for the high-energy region of sqrt(s) > 500 GeV.
|
2110.03977
|
Raghunath Sahoo
|
Suman Deb, Golam Sarwar, Dhananjaya Thakur, Pavish S., Raghunath
Sahoo, and Jan-e Alam
|
Extension of Glauber-like model for Proton-Proton collisions using
anisotropic and inhomogeneous density profile
|
Presented in LHCP-2021. To appear as PoS. Slightly modified version
with corrected references
| null | null | null |
hep-ph hep-ex nucl-ex nucl-th
|
http://creativecommons.org/licenses/by/4.0/
|
Results from proton-proton ($pp$) collisions have routinely been used as a
baseline to analyze and understand the production of QCD matter expected to be
produced in nuclear collisions. But recent studies of small systems formed in
$pp$ collisions at the LHC energies hint at the possibility of producing medium
with collective behavior. Therefore, results from $pp$ collisions required more
careful investigation to understand whether QCD matter is produced in high
multiplicity $pp$ collisions. With this motivation, the Glauber model
traditionally used to study the heavy-ion collision dynamics at high energy is
applied here to understand the dynamics of $pp$ collisions. We have used
anisotropic and inhomogeneous quark/gluon-based proton density profile, a
realistic picture obtained from deep inelastic scattering results and this
model explains the charged particle multiplicity distribution of $pp$
collisions at LHC energies very well. Collision geometric properties like
impact parameter and mean number of binary collisions ($\langle N_{coll}
\rangle$), mean number of participants ($\langle N_{part} \rangle$) at
different multiplicities are determined for $pp$ collisions. We further used
these collision geometric properties to estimate average charged-particle
pseudorapidity density ($\langle dN_{ch}/d\eta \rangle$) and found it to be
comparable with the experimental results. Knowing $\langle N_{coll} \rangle$,
we have obtained nuclear modification-like factor ($R_{pp}$) in $pp$ collisions
which has not been done before to the best of our knowledge.
|
[
{
"created": "Fri, 8 Oct 2021 08:51:06 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Oct 2021 13:32:35 GMT",
"version": "v2"
}
] |
2021-10-28
|
[
[
"Deb",
"Suman",
""
],
[
"Sarwar",
"Golam",
""
],
[
"Thakur",
"Dhananjaya",
""
],
[
"S.",
"Pavish",
""
],
[
"Sahoo",
"Raghunath",
""
],
[
"Alam",
"Jan-e",
""
]
] |
Results from proton-proton ($pp$) collisions have routinely been used as a baseline to analyze and understand the production of QCD matter expected to be produced in nuclear collisions. But recent studies of small systems formed in $pp$ collisions at the LHC energies hint at the possibility of producing medium with collective behavior. Therefore, results from $pp$ collisions required more careful investigation to understand whether QCD matter is produced in high multiplicity $pp$ collisions. With this motivation, the Glauber model traditionally used to study the heavy-ion collision dynamics at high energy is applied here to understand the dynamics of $pp$ collisions. We have used anisotropic and inhomogeneous quark/gluon-based proton density profile, a realistic picture obtained from deep inelastic scattering results and this model explains the charged particle multiplicity distribution of $pp$ collisions at LHC energies very well. Collision geometric properties like impact parameter and mean number of binary collisions ($\langle N_{coll} \rangle$), mean number of participants ($\langle N_{part} \rangle$) at different multiplicities are determined for $pp$ collisions. We further used these collision geometric properties to estimate average charged-particle pseudorapidity density ($\langle dN_{ch}/d\eta \rangle$) and found it to be comparable with the experimental results. Knowing $\langle N_{coll} \rangle$, we have obtained nuclear modification-like factor ($R_{pp}$) in $pp$ collisions which has not been done before to the best of our knowledge.
|
1702.03733
|
Hiroshi Okada
|
SangJong Lee, Takaaki Nomura, Hiroshi Okada
|
Radiatively Induced Neutrino Mass Model with Flavor Dependent Gauge
Symmetry
|
18 pages, 7 figures, 2 tables; version accepted for publication in
Nuclear Physics B
| null |
10.1016/j.nuclphysb.2018.04.010
|
KIAS-P17013
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study a radiative seesaw model at one-loop level with a flavor dependent
gauge symmetry $U(1)_{\mu-\tau}$, in which we consider bosonic dark matter. We
also analyze the constraints from lepton flavor violations, muon $g-2$, relic
density of dark matter, and collider physics, and carry out numerical analysis
to search for allowed parameter region which satisfy all the constraints and to
investigate some predictions. Furthermore we find that a simple but adhoc
hypothesis induces specific two zero texture with inverse mass matrix, which
provides us several predictions such as a specific pattern of Dirac CP phase.
|
[
{
"created": "Mon, 13 Feb 2017 12:10:07 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Apr 2018 13:30:41 GMT",
"version": "v2"
}
] |
2018-05-09
|
[
[
"Lee",
"SangJong",
""
],
[
"Nomura",
"Takaaki",
""
],
[
"Okada",
"Hiroshi",
""
]
] |
We study a radiative seesaw model at one-loop level with a flavor dependent gauge symmetry $U(1)_{\mu-\tau}$, in which we consider bosonic dark matter. We also analyze the constraints from lepton flavor violations, muon $g-2$, relic density of dark matter, and collider physics, and carry out numerical analysis to search for allowed parameter region which satisfy all the constraints and to investigate some predictions. Furthermore we find that a simple but adhoc hypothesis induces specific two zero texture with inverse mass matrix, which provides us several predictions such as a specific pattern of Dirac CP phase.
|
hep-ph/0311369
|
Giovanni Salm\`e
|
J. P. B. C. de Melo (Univer. Estadual-Sao Paulo), T. Frederico
(ITA-Sao Paulo), E. Pace (Rome University), G. Salme` (INFN-Rome)
|
Electromagnetic form factor of the pion in the space- and time-like
regions within the front-form dynamics
|
9 pages + 4 figures. To appear in Phys. Lett. B
|
Phys.Lett. B581 (2004) 75-81
|
10.1016/j.physletb.2003.11.072
|
INFN - 1363/03
|
hep-ph
| null |
The pion electromagnetic form factor is calculated in the space- and
time-like regions from -10 $(GeV/c)^2$ up to 10 $(GeV/c)^2$, within a
front-form model. The dressed photon vertex where a photon decays in a
quark-antiquark pair is depicted generalizing the vector meson dominance
ansatz, by means of the vector meson vertex functions. An important feature of
our model is the description of the on-mass-shell vertex functions in the
valence sector, for the pion and the vector mesons, through the front-form wave
functions obtained within a realistic quark model. The theoretical results show
an excellent agreement with the data in the space-like region, while in the
time-like region the description is quite encouraging.
|
[
{
"created": "Fri, 28 Nov 2003 15:48:52 GMT",
"version": "v1"
}
] |
2009-11-10
|
[
[
"de Melo",
"J. P. B. C.",
"",
"Univer. Estadual-Sao Paulo"
],
[
"Frederico",
"T.",
"",
"ITA-Sao Paulo"
],
[
"Pace",
"E.",
"",
"Rome University"
],
[
"Salme`",
"G.",
"",
"INFN-Rome"
]
] |
The pion electromagnetic form factor is calculated in the space- and time-like regions from -10 $(GeV/c)^2$ up to 10 $(GeV/c)^2$, within a front-form model. The dressed photon vertex where a photon decays in a quark-antiquark pair is depicted generalizing the vector meson dominance ansatz, by means of the vector meson vertex functions. An important feature of our model is the description of the on-mass-shell vertex functions in the valence sector, for the pion and the vector mesons, through the front-form wave functions obtained within a realistic quark model. The theoretical results show an excellent agreement with the data in the space-like region, while in the time-like region the description is quite encouraging.
|
2008.04235
|
Wenchang Xiang
|
Wenchang Xiang, Mengliang Wang, Yanbing Cai, and Daicui Zhou
|
Solution to the Sudakov suppressed Balitsky-Kovchegov equation and its
application to the HERA data
|
15 pages, 4 figures
| null |
10.1088/1674-1137/abc0cc
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We analytically solve the Sudakov suppressed Balitsky-Kovchegov evolution
equation with the fixed and running coupling constants in the saturation
region. The analytic solution of the $S$-matrix shows the
$\exp(\mathcal{O}(\eta^2))$ rapidity dependence of the solution with the fixed
coupling constant is replaced by $\exp(\mathcal{O}(\eta^{3/2}))$ dependence in
the smallest dipole running coupling case rather than obeying the law found in
our previous publication, in which all the solutions of the next-to-leading
order evolution equations comply with $\exp(\mathcal{O}(\eta))$ rapidity
dependence once the QCD coupling is switched from the fixed coupling to the
smallest dipole running coupling prescription. This finding indicates that the
corrections of the sub-leading double logarithms in the Sudakov suppressed
evolution equation are significant, which compensate part of the evolution
decrease of the dipole amplitude made by running coupling effect. To test the
analytic findings, we calculate the numerical solutions of the Sudakov
suppressed evolution equation, the numerical results confirm the analytic
outcomes. Moreover, we use the numerical solutions of the evolution equation to
fit the HERA data. It shows that the Sudakove suppressed evolution equation can
give good quality fit to the data.
|
[
{
"created": "Mon, 10 Aug 2020 16:16:29 GMT",
"version": "v1"
}
] |
2021-02-03
|
[
[
"Xiang",
"Wenchang",
""
],
[
"Wang",
"Mengliang",
""
],
[
"Cai",
"Yanbing",
""
],
[
"Zhou",
"Daicui",
""
]
] |
We analytically solve the Sudakov suppressed Balitsky-Kovchegov evolution equation with the fixed and running coupling constants in the saturation region. The analytic solution of the $S$-matrix shows the $\exp(\mathcal{O}(\eta^2))$ rapidity dependence of the solution with the fixed coupling constant is replaced by $\exp(\mathcal{O}(\eta^{3/2}))$ dependence in the smallest dipole running coupling case rather than obeying the law found in our previous publication, in which all the solutions of the next-to-leading order evolution equations comply with $\exp(\mathcal{O}(\eta))$ rapidity dependence once the QCD coupling is switched from the fixed coupling to the smallest dipole running coupling prescription. This finding indicates that the corrections of the sub-leading double logarithms in the Sudakov suppressed evolution equation are significant, which compensate part of the evolution decrease of the dipole amplitude made by running coupling effect. To test the analytic findings, we calculate the numerical solutions of the Sudakov suppressed evolution equation, the numerical results confirm the analytic outcomes. Moreover, we use the numerical solutions of the evolution equation to fit the HERA data. It shows that the Sudakove suppressed evolution equation can give good quality fit to the data.
|
1808.01437
|
Andreas Metz
|
Shohini Bhattacharya, Christopher Cocuzza, Andreas Metz
|
Generalized quasi parton distributions in a diquark spectator model
|
14 pages; version to be published in PLB
| null |
10.1016/j.physletb.2018.09.061
| null |
hep-ph hep-lat
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recently the concept of quasi parton distributions (quasi-PDFs) for hadrons
has been proposed. Quasi-PDFs are defined through spatial correlation functions
and as such can be computed numerically using quantum chromodynamics on a
four-dimensional lattice. As the hadron momentum is increased, the quasi-PDFs
converge to the corresponding standard PDFs that appear in factorization
theorems for many high-energy scattering processes. Here we investigate this
new concept in the case of generalized parton distributions (GPDs) by
calculating the twist-2 vector GPDs in the scalar diquark spectator model. For
infinite hadron momentum, the analytical results of the quasi-GPDs agree with
those of the standard GPDs. Our main focus is to examine how well the
quasi-GPDs agree with the standard GPDs for finite hadron momenta. We also
study the sensitivity of the results on the parameters of the model. In
general, our model calculation suggests that quasi-GPDs could be a viable tool
for getting information about standard GPDs.
|
[
{
"created": "Sat, 4 Aug 2018 06:54:44 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Sep 2018 12:35:32 GMT",
"version": "v2"
}
] |
2018-12-26
|
[
[
"Bhattacharya",
"Shohini",
""
],
[
"Cocuzza",
"Christopher",
""
],
[
"Metz",
"Andreas",
""
]
] |
Recently the concept of quasi parton distributions (quasi-PDFs) for hadrons has been proposed. Quasi-PDFs are defined through spatial correlation functions and as such can be computed numerically using quantum chromodynamics on a four-dimensional lattice. As the hadron momentum is increased, the quasi-PDFs converge to the corresponding standard PDFs that appear in factorization theorems for many high-energy scattering processes. Here we investigate this new concept in the case of generalized parton distributions (GPDs) by calculating the twist-2 vector GPDs in the scalar diquark spectator model. For infinite hadron momentum, the analytical results of the quasi-GPDs agree with those of the standard GPDs. Our main focus is to examine how well the quasi-GPDs agree with the standard GPDs for finite hadron momenta. We also study the sensitivity of the results on the parameters of the model. In general, our model calculation suggests that quasi-GPDs could be a viable tool for getting information about standard GPDs.
|
hep-ph/9612414
|
Valery Nazaruk
|
V.I.Nazaruk
|
Cause of Disparity between the Results for the $n\bar{n}$ Transition
Problem
|
7 pages, LaTeX
| null | null |
INR-1098
|
hep-ph nucl-th
| null |
We show that there is a double counting in the standard model of $n\bar{n}$
mixing in the medium, resulting in full cancellation of leading terms. The
direct calculation of $n\bar{n}$ transition, annihilation is performed. For
lower limit on the free-space $n\bar{n}$ oscillation time we get $\tau_{min}
\sim 10^{31}y$.
|
[
{
"created": "Thu, 19 Dec 1996 11:22:55 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Nazaruk",
"V. I.",
""
]
] |
We show that there is a double counting in the standard model of $n\bar{n}$ mixing in the medium, resulting in full cancellation of leading terms. The direct calculation of $n\bar{n}$ transition, annihilation is performed. For lower limit on the free-space $n\bar{n}$ oscillation time we get $\tau_{min} \sim 10^{31}y$.
|
2007.08529
|
Martin Hoferichter
|
Martin Hoferichter, Javier Men\'endez, Achim Schwenk
|
Coherent elastic neutrino-nucleus scattering: EFT analysis and nuclear
responses
|
28 pages, 11 figures; journal version
|
Phys. Rev. D 102, 074018 (2020)
|
10.1103/PhysRevD.102.074018
|
INT-PUB-20-026
|
hep-ph hep-ex nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The cross section for coherent elastic neutrino-nucleus scattering
(CE$\nu$NS) depends on the response of the target nucleus to the external
current, in the Standard Model (SM) mediated by the exchange of a $Z$ boson.
This is typically subsumed into an object called the weak form factor of the
nucleus. Here, we provide results for this form factor calculated using the
large-scale nuclear shell model for a wide range of nuclei of relevance for
current CE$\nu$NS experiments, including cesium, iodine, argon, fluorine,
sodium, germanium, and xenon. In addition, we provide the responses needed to
capture the axial-vector part of the cross section, which does not scale
coherently with the number of neutrons, but may become relevant for the SM
prediction of CE$\nu$NS on target nuclei with nonzero spin. We then generalize
the formalism allowing for contributions beyond the SM. In particular, we
stress that in this case, even for vector and axial-vector operators, the
standard weak form factor does not apply anymore, but needs to be replaced by
the appropriate combination of the underlying nuclear structure factors. We
provide the corresponding expressions for vector, axial-vector, but also
(pseudo-)scalar, tensor, and dipole effective operators, including
two-body-current effects as predicted from chiral effective field theory.
Finally, we update the spin-dependent structure factors for dark matter
scattering off nuclei according to our improved treatment of the axial-vector
responses.
|
[
{
"created": "Thu, 16 Jul 2020 18:00:01 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Oct 2020 14:36:17 GMT",
"version": "v2"
}
] |
2020-10-26
|
[
[
"Hoferichter",
"Martin",
""
],
[
"Menéndez",
"Javier",
""
],
[
"Schwenk",
"Achim",
""
]
] |
The cross section for coherent elastic neutrino-nucleus scattering (CE$\nu$NS) depends on the response of the target nucleus to the external current, in the Standard Model (SM) mediated by the exchange of a $Z$ boson. This is typically subsumed into an object called the weak form factor of the nucleus. Here, we provide results for this form factor calculated using the large-scale nuclear shell model for a wide range of nuclei of relevance for current CE$\nu$NS experiments, including cesium, iodine, argon, fluorine, sodium, germanium, and xenon. In addition, we provide the responses needed to capture the axial-vector part of the cross section, which does not scale coherently with the number of neutrons, but may become relevant for the SM prediction of CE$\nu$NS on target nuclei with nonzero spin. We then generalize the formalism allowing for contributions beyond the SM. In particular, we stress that in this case, even for vector and axial-vector operators, the standard weak form factor does not apply anymore, but needs to be replaced by the appropriate combination of the underlying nuclear structure factors. We provide the corresponding expressions for vector, axial-vector, but also (pseudo-)scalar, tensor, and dipole effective operators, including two-body-current effects as predicted from chiral effective field theory. Finally, we update the spin-dependent structure factors for dark matter scattering off nuclei according to our improved treatment of the axial-vector responses.
|
1209.4803
|
Priyotosh Bandyopadhyay
|
Priyotosh Bandyopadhyay, Eung Jin Chun, Hiroshi Okada and Jong-Chul
Park
|
Higgs Signatures in Inverse Seesaw Model at the LHC
|
25 pages, 10 figures and 10 tables
| null |
10.1007/JHEP01(2013)079
|
KIAS-P12026; HIP-2012-13/TH
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the inverse seesaw mechanism where the spontaneously broken B-L symmetry
induces tiny B-L violating Majorana masses for right-handed neutrinos,
non-standard Higgs signatures can arise due to a possible Higgs doublet and
singlet mixing and/or Higgs boson decays to a left- and right-handed neutrino.
This leads to a remarkable feature of hadronically quiet di-lepton final states
which can exhibit, in particular, lepton flavour violating signatures coming
from flavour-dependent neutrino Yukawa couplings. In this process, one lepton
coming from the right-handed decay could be soft enough can be missed by the
trigger level cuts of CMS and ATLAS for the di-lepton plus missing energy
signature. The prospects of such a signature are investigated for 8 TeV and 14
TeV center of mass energy of the LHC, taking the maximum value of the allowed
neutrino Yukawa coupling and the right-handed neutrino mass of 100 GeV. A
PYTHIA level simulation shows that the integrated luminosity of 10--20/fb and
1.6/fb for 8 TeV is required to observe the inclusive leptonic and lepton
flavour violating signatures, respectively. For 14 TeV, the reach is more and a
larger parameter space of the inverse seesaw model can be probed.
|
[
{
"created": "Fri, 21 Sep 2012 12:45:38 GMT",
"version": "v1"
}
] |
2015-06-11
|
[
[
"Bandyopadhyay",
"Priyotosh",
""
],
[
"Chun",
"Eung Jin",
""
],
[
"Okada",
"Hiroshi",
""
],
[
"Park",
"Jong-Chul",
""
]
] |
In the inverse seesaw mechanism where the spontaneously broken B-L symmetry induces tiny B-L violating Majorana masses for right-handed neutrinos, non-standard Higgs signatures can arise due to a possible Higgs doublet and singlet mixing and/or Higgs boson decays to a left- and right-handed neutrino. This leads to a remarkable feature of hadronically quiet di-lepton final states which can exhibit, in particular, lepton flavour violating signatures coming from flavour-dependent neutrino Yukawa couplings. In this process, one lepton coming from the right-handed decay could be soft enough can be missed by the trigger level cuts of CMS and ATLAS for the di-lepton plus missing energy signature. The prospects of such a signature are investigated for 8 TeV and 14 TeV center of mass energy of the LHC, taking the maximum value of the allowed neutrino Yukawa coupling and the right-handed neutrino mass of 100 GeV. A PYTHIA level simulation shows that the integrated luminosity of 10--20/fb and 1.6/fb for 8 TeV is required to observe the inclusive leptonic and lepton flavour violating signatures, respectively. For 14 TeV, the reach is more and a larger parameter space of the inverse seesaw model can be probed.
|
1511.04379
|
Sophia Borowka
|
S. Borowka
|
Calculation of multi-scale, multi-loop integrals using SecDec 3
|
5 pages, proceedings contribution to the XXXIX international
conference of theoretical physics "Matter to the deepest 2015"
| null |
10.5506/APhysPolB.46.2137
|
ZU-TH 37/15
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In these proceedings the publicly available program SecDec is briefly
described. Its main virtues and new features are summarized, including
suggestions for an optimal usage of the program.
|
[
{
"created": "Fri, 13 Nov 2015 17:37:21 GMT",
"version": "v1"
}
] |
2016-01-20
|
[
[
"Borowka",
"S.",
""
]
] |
In these proceedings the publicly available program SecDec is briefly described. Its main virtues and new features are summarized, including suggestions for an optimal usage of the program.
|
2009.02205
|
Benjamin Nachman
|
Kees Benkendorfer, Luc Le Pottier, and Benjamin Nachman
|
Simulation-Assisted Decorrelation for Resonant Anomaly Detection
|
17 pages, 7 figures
|
Phys. Rev. D 104, 035003 (2021)
|
10.1103/PhysRevD.104.035003
| null |
hep-ph hep-ex physics.data-an stat.ML
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A growing number of weak- and unsupervised machine learning approaches to
anomaly detection are being proposed to significantly extend the search program
at the Large Hadron Collider and elsewhere. One of the prototypical examples
for these methods is the search for resonant new physics, where a bump hunt can
be performed in an invariant mass spectrum. A significant challenge to methods
that rely entirely on data is that they are susceptible to sculpting artificial
bumps from the dependence of the machine learning classifier on the invariant
mass. We explore two solutions to this challenge by minimally incorporating
simulation into the learning. In particular, we study the robustness of
Simulation Assisted Likelihood-free Anomaly Detection (SALAD) to correlations
between the classifier and the invariant mass. Next, we propose a new approach
that only uses the simulation for decorrelation but the Classification without
Labels (CWoLa) approach for achieving signal sensitivity. Both methods are
compared using a full background fit analysis on simulated data from the LHC
Olympics and are robust to correlations in the data.
|
[
{
"created": "Fri, 4 Sep 2020 14:02:15 GMT",
"version": "v1"
}
] |
2021-08-11
|
[
[
"Benkendorfer",
"Kees",
""
],
[
"Pottier",
"Luc Le",
""
],
[
"Nachman",
"Benjamin",
""
]
] |
A growing number of weak- and unsupervised machine learning approaches to anomaly detection are being proposed to significantly extend the search program at the Large Hadron Collider and elsewhere. One of the prototypical examples for these methods is the search for resonant new physics, where a bump hunt can be performed in an invariant mass spectrum. A significant challenge to methods that rely entirely on data is that they are susceptible to sculpting artificial bumps from the dependence of the machine learning classifier on the invariant mass. We explore two solutions to this challenge by minimally incorporating simulation into the learning. In particular, we study the robustness of Simulation Assisted Likelihood-free Anomaly Detection (SALAD) to correlations between the classifier and the invariant mass. Next, we propose a new approach that only uses the simulation for decorrelation but the Classification without Labels (CWoLa) approach for achieving signal sensitivity. Both methods are compared using a full background fit analysis on simulated data from the LHC Olympics and are robust to correlations in the data.
|
hep-ph/9509327
|
Raymond Volkas
|
R. Foot, M. J. Thomson and R. R. Volkas
|
Large neutrino asymmetries from neutrino oscillations
|
12 pages, LaTeX, one figure
|
Phys.Rev.D53:5349-5353,1996
|
10.1103/PhysRevD.53.R5349
|
UM-P-95/90
|
hep-ph astro-ph
| null |
We re-examine neutrino oscillations in the early universe. Contrary to
previous studies, we show that large neutrino asymmetries can arise due to
oscillations between ordinary neutrinos and sterile neutrinos. This means that
the Big Bang Nucleosynthesis (BBN) bounds on the mass and mixing of ordinary
neutrinos with sterile neutrinos can be evaded. Also, it is possible that the
neutrino asymmetries can be large (i.e. $\stackrel{>}{\sim} 10\%$), and hence
have a significant effect on BBN through nuclear reaction rates.
|
[
{
"created": "Tue, 19 Sep 1995 06:36:41 GMT",
"version": "v1"
}
] |
2011-02-24
|
[
[
"Foot",
"R.",
""
],
[
"Thomson",
"M. J.",
""
],
[
"Volkas",
"R. R.",
""
]
] |
We re-examine neutrino oscillations in the early universe. Contrary to previous studies, we show that large neutrino asymmetries can arise due to oscillations between ordinary neutrinos and sterile neutrinos. This means that the Big Bang Nucleosynthesis (BBN) bounds on the mass and mixing of ordinary neutrinos with sterile neutrinos can be evaded. Also, it is possible that the neutrino asymmetries can be large (i.e. $\stackrel{>}{\sim} 10\%$), and hence have a significant effect on BBN through nuclear reaction rates.
|
hep-ph/0510084
|
Kuraev Eduard
|
V. Bytev, E. Bartos, M.V. Galynskii, E.A. Kuraev
|
Radiative corrections to chiral amplitudes in quasiperipheral kinematics
|
25 pages, 6 figures
|
J.Exp.Theor.Phys. 103 (2006) 224-240
|
10.1134/S1063776106080061
| null |
hep-ph
| null |
Chiral amplitudes for two jets processes in quasi-peripheral kinematics are
calculated at the Born and one loop correction level. The amplitudes of
subprocesses describing interaction of virtual and real photon with creation of
a charged fermion pair for various chiral states are considered in details.
Similar results are presented for Compton subprocess with virtual photon.
Contribution of emission of virtual, soft, and hard real additional photons
are taken into account explicitly. The relevant cross sections expressed in
terms of impact factors are in agreement with structure function approach in
the leading logarithmical approximation.
Contributions of the next to leading terms are presented in an analytical
form. Accuracy estimation is discussed.
|
[
{
"created": "Fri, 7 Oct 2005 07:51:34 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Mar 2006 13:04:20 GMT",
"version": "v2"
}
] |
2016-09-06
|
[
[
"Bytev",
"V.",
""
],
[
"Bartos",
"E.",
""
],
[
"Galynskii",
"M. V.",
""
],
[
"Kuraev",
"E. A.",
""
]
] |
Chiral amplitudes for two jets processes in quasi-peripheral kinematics are calculated at the Born and one loop correction level. The amplitudes of subprocesses describing interaction of virtual and real photon with creation of a charged fermion pair for various chiral states are considered in details. Similar results are presented for Compton subprocess with virtual photon. Contribution of emission of virtual, soft, and hard real additional photons are taken into account explicitly. The relevant cross sections expressed in terms of impact factors are in agreement with structure function approach in the leading logarithmical approximation. Contributions of the next to leading terms are presented in an analytical form. Accuracy estimation is discussed.
|
0901.0613
|
Jackson Wu
|
We-Fu Chang, John N. Ng, Jackson M. S. Wu
|
Exploring Non-Supersymmetric New Physics in Polarized M\o{}ller
Scattering
|
v2: 25 pages, 7 figures. Typos fixed, clarifications added,
presentation of plots improved, title slightly changed. To be published in
PRD
|
Phys.Rev.D79:055016,2009
|
10.1103/PhysRevD.79.055016
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study in an effective operator approach how the effects of new physics
from various scenarios that contain an extra $Z'$ neutral gauge boson or doubly
charged scalars, can affect and thus be tested by the precision polarized
M\o{}ller scattering experiments. We give Wilson coefficients for various
classes of generic models, and we deduce constraints on the parameter space of
the relevant coupling constants or mixing angles from the results of the SLAC
E158 experiment where applicable. We give also constraints projected from the
upcoming 1 ppb JLAB experiment. In the scenario where the extra $Z'$ is light
($M_{Z'} \ll M_W$), we obtain further constraints on the parameter space using
the BNL $g-2$ result where it is useful. We find that the BNL deviation from
the Standard Model cannot be attributed to a light extra $Z'$ neutral gauge
boson.
|
[
{
"created": "Tue, 6 Jan 2009 09:37:35 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Mar 2009 16:24:59 GMT",
"version": "v2"
}
] |
2009-11-13
|
[
[
"Chang",
"We-Fu",
""
],
[
"Ng",
"John N.",
""
],
[
"Wu",
"Jackson M. S.",
""
]
] |
We study in an effective operator approach how the effects of new physics from various scenarios that contain an extra $Z'$ neutral gauge boson or doubly charged scalars, can affect and thus be tested by the precision polarized M\o{}ller scattering experiments. We give Wilson coefficients for various classes of generic models, and we deduce constraints on the parameter space of the relevant coupling constants or mixing angles from the results of the SLAC E158 experiment where applicable. We give also constraints projected from the upcoming 1 ppb JLAB experiment. In the scenario where the extra $Z'$ is light ($M_{Z'} \ll M_W$), we obtain further constraints on the parameter space using the BNL $g-2$ result where it is useful. We find that the BNL deviation from the Standard Model cannot be attributed to a light extra $Z'$ neutral gauge boson.
|
hep-ph/0510270
|
Sebastian Sapeta
|
S.Sapeta
|
Diffraction at Tevatron and LHC in the Miettinen-Pumplin model
|
6 pages, 3 figures; Talk presented at the XLV Cracow School of
Theoretical Physics, Zakopane, Poland, June 3-12, 2005
|
Acta Phys.Polon. B36 (2005) 3689-3696
| null | null |
hep-ph
| null |
The process of soft diffractive dissociation in hadronic collisions is
discussed in the framework of the Miettinen-Pumplin model. A good description
of the data in the ISR-Tevatron energy range is found. Predictions for the
total, elastic and single diffractive cross sections for the LHC are also
presented. The total cross section is expected to be 15% smaller than that
given by Donnachie and Landshoff in the model with soft pomeron. The
diffractive cross section remains constant in the Tevatron-LHC energy range.
|
[
{
"created": "Thu, 20 Oct 2005 15:01:40 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Sapeta",
"S.",
""
]
] |
The process of soft diffractive dissociation in hadronic collisions is discussed in the framework of the Miettinen-Pumplin model. A good description of the data in the ISR-Tevatron energy range is found. Predictions for the total, elastic and single diffractive cross sections for the LHC are also presented. The total cross section is expected to be 15% smaller than that given by Donnachie and Landshoff in the model with soft pomeron. The diffractive cross section remains constant in the Tevatron-LHC energy range.
|
1504.03799
|
Weizhen Deng
|
Yi-Long Luan, Xiao-Lin Chen and Wei-Zhen Deng
|
Meson Electro-Magnetic Form Factors in an Extended Nambu--Jona-Lasinio
model including Heavy Quark Flavors
| null |
Chinese Physics C Vol. 39, No. 11 (2015) 113103
|
10.1088/1674-1137/39/11/113103
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Based on an extended NJL model including heavy quark flavors, we calculate
the form factors of pseudo-scalar and vector mesons. After take into account of
the vector-meson-dominance effect which introduce a form factor correction to
the quark vector coupling vertices, the form factors and electric radii of
$\pi^+$ and $K^+$ of pseudo-scalar meson in light flavor sector fit the
experimental data well. Also the magnetic moments of light vector meson
$\rho^+$ and $K^{*+}$ are comparable with other theoretical calculation. The
form factors in light-heavy flavor sector are presented to confront with future
experiments or theoretical calculations.
|
[
{
"created": "Wed, 15 Apr 2015 07:19:39 GMT",
"version": "v1"
},
{
"created": "Sun, 21 Jun 2015 11:08:33 GMT",
"version": "v2"
}
] |
2015-09-24
|
[
[
"Luan",
"Yi-Long",
""
],
[
"Chen",
"Xiao-Lin",
""
],
[
"Deng",
"Wei-Zhen",
""
]
] |
Based on an extended NJL model including heavy quark flavors, we calculate the form factors of pseudo-scalar and vector mesons. After take into account of the vector-meson-dominance effect which introduce a form factor correction to the quark vector coupling vertices, the form factors and electric radii of $\pi^+$ and $K^+$ of pseudo-scalar meson in light flavor sector fit the experimental data well. Also the magnetic moments of light vector meson $\rho^+$ and $K^{*+}$ are comparable with other theoretical calculation. The form factors in light-heavy flavor sector are presented to confront with future experiments or theoretical calculations.
|
2208.03790
|
Ephraim Fischbach
|
Ephraim Fischbach, Dennis E. Krause, Quan Le Thien, and Carol Scarlett
|
Implications of Recent KATRIN Results for Lower-Limits on Neutrino
Masses
|
5 pages, 6 figures, Revtex
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
Recently announced results from the KATRIN collaboration imply an upper bound
on the effective electron anti-neutrino mass $m_{\nu_{e}}$, $m_{\nu_{e}}<
0.8~{\rm eV}/c^{2}$. Here we explore the implications of combining the KATRIN
upper bound using a previously inferred lower bound on the smallest neutrino
mass state, $m_{i,{\rm min}}\gtrsim 0.4~{\rm eV}/c^{2}$ implied by the
stability of white dwarfs and neutron stars in the presence of long-range
many-body neutrino-exchange forces. By combining a revised lower bound estimate
with the expected final upper bound from KATRIN, we find that the available
parameter space for $m_{\nu_{e}}$ may be closed completely within the next few
years. We then extend the argument when a single light sterile neutrino flavor
is present to set a lower mass limit on sterile neutrinos.
|
[
{
"created": "Sun, 7 Aug 2022 19:06:19 GMT",
"version": "v1"
}
] |
2022-08-09
|
[
[
"Fischbach",
"Ephraim",
""
],
[
"Krause",
"Dennis E.",
""
],
[
"Thien",
"Quan Le",
""
],
[
"Scarlett",
"Carol",
""
]
] |
Recently announced results from the KATRIN collaboration imply an upper bound on the effective electron anti-neutrino mass $m_{\nu_{e}}$, $m_{\nu_{e}}< 0.8~{\rm eV}/c^{2}$. Here we explore the implications of combining the KATRIN upper bound using a previously inferred lower bound on the smallest neutrino mass state, $m_{i,{\rm min}}\gtrsim 0.4~{\rm eV}/c^{2}$ implied by the stability of white dwarfs and neutron stars in the presence of long-range many-body neutrino-exchange forces. By combining a revised lower bound estimate with the expected final upper bound from KATRIN, we find that the available parameter space for $m_{\nu_{e}}$ may be closed completely within the next few years. We then extend the argument when a single light sterile neutrino flavor is present to set a lower mass limit on sterile neutrinos.
|
hep-ph/0407306
|
Thomas D. Cohen
|
Thomas D. Cohen
|
Large Nc Continuum Reduction and the Thermodynamics of QCD
| null |
Phys.Rev.Lett. 93 (2004) 201601
|
10.1103/PhysRevLett.93.201601
| null |
hep-ph hep-lat nucl-th
| null |
It is noted that if large Nc continuum reduction applies to an observable,
then that observable is independent of temperature for all temperatures below
some critical value. This fact, plus the fact that mesons and glueballs are
weakly interacting at large Nc is used as the basis for a derivation of large
Nc continuum reduction for the chiral condensate. The structure of this
derivation is quite general and can be extended to a wide class of observables.
|
[
{
"created": "Tue, 27 Jul 2004 13:43:31 GMT",
"version": "v1"
}
] |
2009-11-10
|
[
[
"Cohen",
"Thomas D.",
""
]
] |
It is noted that if large Nc continuum reduction applies to an observable, then that observable is independent of temperature for all temperatures below some critical value. This fact, plus the fact that mesons and glueballs are weakly interacting at large Nc is used as the basis for a derivation of large Nc continuum reduction for the chiral condensate. The structure of this derivation is quite general and can be extended to a wide class of observables.
|
hep-ph/9708457
|
Zhi Gang Yu
|
Guang-jiong Ni and Haibin Wang
|
New Regularization-Renormalization Method in Quantum Electrodynamics and
Qualitative Calculation on Lamb Shift
|
9 pages, no figures
| null | null | null |
hep-ph
| null |
A simple but effective method for regularization-renormalization (R-R) is
proposed for handling the Feynman diagram integral (FDI) at one loop level in
quantum electrodynamics (QED). The divergence is substituted by some constants
to be fixed via experiments. So no counter term, no bare parameter and no
arbitrary running mass scale is involved. Then the Lamb Shift in Hydrogen atom
can be calculated qualitatively and simply as $\Delta E(2S_{1/2})- \Delta
E(2P_{1/2})=996.7 MHz$ versus the experimental value $1057.85 MHz$.
|
[
{
"created": "Mon, 25 Aug 1997 22:51:23 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Ni",
"Guang-jiong",
""
],
[
"Wang",
"Haibin",
""
]
] |
A simple but effective method for regularization-renormalization (R-R) is proposed for handling the Feynman diagram integral (FDI) at one loop level in quantum electrodynamics (QED). The divergence is substituted by some constants to be fixed via experiments. So no counter term, no bare parameter and no arbitrary running mass scale is involved. Then the Lamb Shift in Hydrogen atom can be calculated qualitatively and simply as $\Delta E(2S_{1/2})- \Delta E(2P_{1/2})=996.7 MHz$ versus the experimental value $1057.85 MHz$.
|
0810.5667
|
Oliver Fochler
|
Oliver Fochler, Andrej El, Zhe Xu and Carsten Greiner
|
QCD plasma equilibration, elliptic flow and jet-quenching - phenomena of
common origin
|
Proc. 24th Winter Workshop on Nuclear Dynamics (2008), South Padre,
Texas, USA
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Fast thermalization, a subsequent strong buildup of elliptic flow of QCD
matter and jet-quenching as found at the Relativistic Heavy Ion Collider (RHIC)
are understood as the consequence of perturbative QCD (pQCD) interactions
within the 3+1 dimensional parton cascade BAMPS. The main contributions stem
from pQCD inspired bremsstrahlung. Comparisons to Au+Au data of the flow
parameter v_2 as a function of participation number as well as the gluonic
contribution to the nuclear modification factor R_AA for most central
collisions are given. Also the shear viscosity to entropy ratio is dynamically
extracted, which lies in the range of 0.08-0.15, depending on the chosen
coupling constant.
|
[
{
"created": "Fri, 31 Oct 2008 11:53:30 GMT",
"version": "v1"
}
] |
2008-11-03
|
[
[
"Fochler",
"Oliver",
""
],
[
"El",
"Andrej",
""
],
[
"Xu",
"Zhe",
""
],
[
"Greiner",
"Carsten",
""
]
] |
Fast thermalization, a subsequent strong buildup of elliptic flow of QCD matter and jet-quenching as found at the Relativistic Heavy Ion Collider (RHIC) are understood as the consequence of perturbative QCD (pQCD) interactions within the 3+1 dimensional parton cascade BAMPS. The main contributions stem from pQCD inspired bremsstrahlung. Comparisons to Au+Au data of the flow parameter v_2 as a function of participation number as well as the gluonic contribution to the nuclear modification factor R_AA for most central collisions are given. Also the shear viscosity to entropy ratio is dynamically extracted, which lies in the range of 0.08-0.15, depending on the chosen coupling constant.
|
1403.0415
|
Sergei Nedelko
|
Sergei N. Nedelko, Vladimir E. Voronin
|
Domain wall network as QCD vacuum and the chromomagnetic trap formation
under extreme conditions
|
20 pages, 10 figures
| null |
10.1140/epja/i2015-15045-8
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The ensemble of Euclidean gluon field configurations represented by the
domain wall network is considered. A single domain wall is given by the
sine-Gordon kink for the angle between chromomagnetic and chromoelectric
components of the gauge field. The domain wall separates the regions with
self-dual and anti-self-dual fields. The network of the domain wall defects is
introduced as a combination of multiplicative and additive superpositions of
kinks. The character of the spectrum and eigenmodes of color-charged
fluctuations in the presence of the domain wall network is discussed. The
concept of the confinement-deconfinement transition in terms of the ensemble of
domain wall networks is outlined. Conditions for the formation of thick domain
wall junction during heavy ion collisions are discussed, and the spectrum of
color charged quasiparticles inside the trap is evaluated. An important
observation is the existence of the critical size $L_c$ of the trap stable
against gluon tachyonic modes, which means that deconfinement can occur only in
a finite region of space-time in principle. The size $L_c$ is related to the
value of gluon condensate $\langle g^2F^2\rangle$.
|
[
{
"created": "Mon, 3 Mar 2014 12:48:14 GMT",
"version": "v1"
}
] |
2015-06-18
|
[
[
"Nedelko",
"Sergei N.",
""
],
[
"Voronin",
"Vladimir E.",
""
]
] |
The ensemble of Euclidean gluon field configurations represented by the domain wall network is considered. A single domain wall is given by the sine-Gordon kink for the angle between chromomagnetic and chromoelectric components of the gauge field. The domain wall separates the regions with self-dual and anti-self-dual fields. The network of the domain wall defects is introduced as a combination of multiplicative and additive superpositions of kinks. The character of the spectrum and eigenmodes of color-charged fluctuations in the presence of the domain wall network is discussed. The concept of the confinement-deconfinement transition in terms of the ensemble of domain wall networks is outlined. Conditions for the formation of thick domain wall junction during heavy ion collisions are discussed, and the spectrum of color charged quasiparticles inside the trap is evaluated. An important observation is the existence of the critical size $L_c$ of the trap stable against gluon tachyonic modes, which means that deconfinement can occur only in a finite region of space-time in principle. The size $L_c$ is related to the value of gluon condensate $\langle g^2F^2\rangle$.
|
2308.05944
|
Victoria Puyam
|
Victoria Puyam and N. Nimai Singh
|
$A_{5}$ symmetry and deviation from Golden Ratio mixing with charged
lepton flavor violation
|
26 figures and 4 tables
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A neutrino mass model that can satisfy the exact golden ratio mixing is
constructed using $A_{5}$ discrete symmetry group. The deviation from the
golden ratio mixing is studied by considering the contribution from the charged
lepton sector in a linear seesaw framework. A definite pattern of charged
lepton mass matrix predicted by the model controls the leptonic mixing angles.
By taking the observed $\theta_{13}$ as the input value, we can obtain the
values of all the mixing angles and Dirac CP-violating phase within the current
experimental bounds.
The model predicts that only the normal neutrino mass ordering is consistent
with the current oscillation data. We also study the charged lepton flavor
violation (cLFV) process such as $\mu \rightarrow e +\gamma$ and $\tau
\rightarrow e +\gamma$ and neutrinoless double beta decay parameter $m_{\beta
\beta}$. The present neutrino mass model can explain the current and future
sensitivity of the cLFV processes and the present sensitivity of neutrinoless
double beta decay parameter when the masses of quasi-Dirac neutrinos are in the
TeV range.
|
[
{
"created": "Fri, 11 Aug 2023 05:37:13 GMT",
"version": "v1"
},
{
"created": "Sun, 3 Mar 2024 11:02:32 GMT",
"version": "v2"
}
] |
2024-03-05
|
[
[
"Puyam",
"Victoria",
""
],
[
"Singh",
"N. Nimai",
""
]
] |
A neutrino mass model that can satisfy the exact golden ratio mixing is constructed using $A_{5}$ discrete symmetry group. The deviation from the golden ratio mixing is studied by considering the contribution from the charged lepton sector in a linear seesaw framework. A definite pattern of charged lepton mass matrix predicted by the model controls the leptonic mixing angles. By taking the observed $\theta_{13}$ as the input value, we can obtain the values of all the mixing angles and Dirac CP-violating phase within the current experimental bounds. The model predicts that only the normal neutrino mass ordering is consistent with the current oscillation data. We also study the charged lepton flavor violation (cLFV) process such as $\mu \rightarrow e +\gamma$ and $\tau \rightarrow e +\gamma$ and neutrinoless double beta decay parameter $m_{\beta \beta}$. The present neutrino mass model can explain the current and future sensitivity of the cLFV processes and the present sensitivity of neutrinoless double beta decay parameter when the masses of quasi-Dirac neutrinos are in the TeV range.
|
hep-ph/9811325
|
James Wells
|
James D. Wells (CERN), Alexander Moiseev (NASA), Jonathan F. Ormes
(NASA)
|
Illuminating dark matter and primordial black holes with interstellar
antiprotons
|
18 pages, 3 figures
|
Astrophys.J. 518 (1999) 570
|
10.1086/307325
|
CERN-TH/98-362
|
hep-ph astro-ph
| null |
Interstellar antiproton fluxes can arise from dark matter annihilating or
decaying into quarks or gluons that subsequently fragment into antiprotons.
Evaporation of primordial black holes also can produce a significant antiproton
cosmic-ray flux. Since the background of secondary antiprotons from spallation
has an interstellar energy spectrum that peaks at $\sim 2\gev$ and falls
rapidly for energies below this, low-energy measurements of cosmic antiprotons
are useful in the search for exotic antiproton sources. However, measurement of
the flux near the earth is challenged by significant uncertainties from the
effects of the solar wind. We suggest evading this problem and more effectively
probing dark-matter signals by placing an antiproton spectrometer aboard an
interstellar probe currently under discussion. We address the experimental
challenges of a light, low-power-consuming detector, and present an initial
design of such an instrument. This experimental effort could significantly
increase our ability to detect, and have confidence in, a signal of exotic,
nonstandard antiproton sources. Furthermore, solar modulation effects in the
heliosphere would be better quantified and understood by comparing results to
inverse modulated data derived from existing balloon and space-based detectors
near the earth.
|
[
{
"created": "Fri, 13 Nov 1998 21:06:32 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Wells",
"James D.",
"",
"CERN"
],
[
"Moiseev",
"Alexander",
"",
"NASA"
],
[
"Ormes",
"Jonathan F.",
"",
"NASA"
]
] |
Interstellar antiproton fluxes can arise from dark matter annihilating or decaying into quarks or gluons that subsequently fragment into antiprotons. Evaporation of primordial black holes also can produce a significant antiproton cosmic-ray flux. Since the background of secondary antiprotons from spallation has an interstellar energy spectrum that peaks at $\sim 2\gev$ and falls rapidly for energies below this, low-energy measurements of cosmic antiprotons are useful in the search for exotic antiproton sources. However, measurement of the flux near the earth is challenged by significant uncertainties from the effects of the solar wind. We suggest evading this problem and more effectively probing dark-matter signals by placing an antiproton spectrometer aboard an interstellar probe currently under discussion. We address the experimental challenges of a light, low-power-consuming detector, and present an initial design of such an instrument. This experimental effort could significantly increase our ability to detect, and have confidence in, a signal of exotic, nonstandard antiproton sources. Furthermore, solar modulation effects in the heliosphere would be better quantified and understood by comparing results to inverse modulated data derived from existing balloon and space-based detectors near the earth.
|
hep-ph/9407402
| null |
B. Moussallam
|
Chiral Sum-Rules for ${\cal L}^{WZ}_{(6)}$ Parameters and Application to
$\pi^0,\eta,\eta'$ Decays
|
An important sign error was corrected and the paper has somewhat
expanded
|
Phys.Rev. D51 (1995) 4939-4949
|
10.1103/PhysRevD.51.4939
| null |
hep-ph
| null |
The chiral expansion of the low energy processes $\pi^0\to\gamma\gamma$ and
$\eta\to\gamma\gamma$ is reconsidered with particular emphasis on the question
of the evaluation of the two low-energy parameters from ${\cal L}^{WZ}_{(6)}$
which are involved at chiral order six. It is shown how extensive use of
sum-rules and saturation with resonances as well as constraints from asymptotic
QCD effectively determine their values. Predictions for the widths are
presented for both standard and non-standard values of the quark mass ratio
$m_s/{\hat m}$. A precise relation is established between the usual
phenomenological $\eta-\eta'$ mixing parameters and those of the chiral
expansion. The large size of the chiral correction to the $\eta$ decay can be
understood on the basis of a simple counting rule: $O(1/N_c)\sim\ O(m_q)$. It
is shown how this counting rule eventually allows one to include the $\eta'$
into the effective lagrangian in a consistent and systematic way.
|
[
{
"created": "Fri, 29 Jul 1994 16:32:01 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Mar 1995 13:44:26 GMT",
"version": "v2"
}
] |
2009-10-28
|
[
[
"Moussallam",
"B.",
""
]
] |
The chiral expansion of the low energy processes $\pi^0\to\gamma\gamma$ and $\eta\to\gamma\gamma$ is reconsidered with particular emphasis on the question of the evaluation of the two low-energy parameters from ${\cal L}^{WZ}_{(6)}$ which are involved at chiral order six. It is shown how extensive use of sum-rules and saturation with resonances as well as constraints from asymptotic QCD effectively determine their values. Predictions for the widths are presented for both standard and non-standard values of the quark mass ratio $m_s/{\hat m}$. A precise relation is established between the usual phenomenological $\eta-\eta'$ mixing parameters and those of the chiral expansion. The large size of the chiral correction to the $\eta$ decay can be understood on the basis of a simple counting rule: $O(1/N_c)\sim\ O(m_q)$. It is shown how this counting rule eventually allows one to include the $\eta'$ into the effective lagrangian in a consistent and systematic way.
|
0807.0394
|
Alfredo Valcarce
|
A. Valcarce, J. Vijande, P. Gonzalez, H. Garcilazo
|
Hadron physics: a quark-model analysis
|
Talk given at the 6th International Conference on Perspectives in
Hadronic Physics, Trieste, Italy, 12-16 May 2008
|
AIPConf.Proc.1056:47-54,2008
|
10.1063/1.3013079
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss recent results on heavy and light baryon spectroscopy
|
[
{
"created": "Wed, 2 Jul 2008 16:27:52 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Valcarce",
"A.",
""
],
[
"Vijande",
"J.",
""
],
[
"Gonzalez",
"P.",
""
],
[
"Garcilazo",
"H.",
""
]
] |
We discuss recent results on heavy and light baryon spectroscopy
|
hep-ph/9906547
|
Aude Gehrmann
|
A. Gehrmann-De Ridder (Karlsruhe University,TTP & DESY)
|
Deep-inelastic Electron-Photon Scattering at High Q^2 : Neutral and
Charged Current Reactions
|
Talk given at the International Conference on the Structure and
Interactions of the Photon, PHOTON 99, Freiburg im Breisgau, Germany, May
23-27, 1999. To be published in the Proceedings. 6 pages, 6 postscript
figures. The complete paper, including figures, is also available via
anonymous ftp at ftp://ttpux2.physik.uni-karlsruhe.de/ttp99/ttp99-30/ or via
www at http://www-ttp.physik.uni-karlsruhe.de/Preprints/
|
Nucl.Phys.Proc.Suppl. 82 (2000) 385-390
|
10.1016/S0920-5632(00)00182-1
|
TTP99-30
|
hep-ph
| null |
We present the results of a calculation of deep inelastic electron-photon
scattering at a linear collider for very high virtuality of the intermediate
gauge boson up to NLO in perturbative QCD. The real photon is produced
unpolarized via the Compton back scattering of laser light of the incoming
beam. For $Q^2$ values close to the masses squared of the Z and W gauge bosons,
the deep inelastic electron-photon scattering process receives important
contributions not only from virtual photon exchange but also from the exchange
of a Z-boson and a W-boson. We find that the total cross section for center of
mass energies above $500 \rm{GeV}$ is at least of ${\cal O}(pb)$ and has an
important charged current contribution.
|
[
{
"created": "Wed, 30 Jun 1999 12:11:57 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Ridder",
"A. Gehrmann-De",
"",
"Karlsruhe University,TTP & DESY"
]
] |
We present the results of a calculation of deep inelastic electron-photon scattering at a linear collider for very high virtuality of the intermediate gauge boson up to NLO in perturbative QCD. The real photon is produced unpolarized via the Compton back scattering of laser light of the incoming beam. For $Q^2$ values close to the masses squared of the Z and W gauge bosons, the deep inelastic electron-photon scattering process receives important contributions not only from virtual photon exchange but also from the exchange of a Z-boson and a W-boson. We find that the total cross section for center of mass energies above $500 \rm{GeV}$ is at least of ${\cal O}(pb)$ and has an important charged current contribution.
|
1606.00775
|
Ivan Ni\v{s}and\v{z}i\'c
|
Simon Bra{\ss}, Gudrun Hiller and Ivan Nisandzic
|
Zooming in on $B\to K^\ast \ell\ell$ decays at low recoil
|
18 pages, v2: references and clarifications added, conclusions
unchanged, matches published version
|
Eur.Phys.J. C77 (2017) no.1, 16
|
10.1140/epjc/s10052-016-4576-9
|
DO-TH 16/06, SI-HEP-2016-11
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We analyse $B\to K^\ast \ell\ell$ decays in the region of low hadronic
recoil, where an operator product expansion (OPE) in $1/m_b$ applies. Using a
local model for charm contributions based on $e^+ e^- \to hadrons$ against the
OPE provides a data-driven method to access the limitations to the OPE's
accuracy related to binnings in the dilepton mass. Model-independent fits to
$B\to K^\ast \mu \mu $ low recoil angular observables exhibit presently only
small sensitivity to different charm models. They give similar results as the
fits based on the OPE, and are in agreement with the standard model, but leave
also room for new physics. Measurements with resolution small enough to probe
charm resonances would be desirable.
|
[
{
"created": "Thu, 2 Jun 2016 17:36:08 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Jan 2017 13:11:28 GMT",
"version": "v2"
}
] |
2017-02-01
|
[
[
"Braß",
"Simon",
""
],
[
"Hiller",
"Gudrun",
""
],
[
"Nisandzic",
"Ivan",
""
]
] |
We analyse $B\to K^\ast \ell\ell$ decays in the region of low hadronic recoil, where an operator product expansion (OPE) in $1/m_b$ applies. Using a local model for charm contributions based on $e^+ e^- \to hadrons$ against the OPE provides a data-driven method to access the limitations to the OPE's accuracy related to binnings in the dilepton mass. Model-independent fits to $B\to K^\ast \mu \mu $ low recoil angular observables exhibit presently only small sensitivity to different charm models. They give similar results as the fits based on the OPE, and are in agreement with the standard model, but leave also room for new physics. Measurements with resolution small enough to probe charm resonances would be desirable.
|
1801.09325
|
Teruyuki Kitabayashi
|
Teruyuki Kitabayashi, Hirona Matsumura, Kantaro Minakuchi and Hiroshi
Ozaki
|
$S_4$ symmetric four-generation models for charged leptons
|
11 pages, no figure
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose $S_4$ symmetric four-generation models for charged leptons.
Although an $S_4$ symmetric four-generation model has been already proposed,
there are some additional symmetries in the model. We construct four-generation
models for charged leptons with only requirement of exact $S_4$ symmetry. It
turned out that at least one of the models is consistent with observations of
charged lepton masses and predicts the mass of the charged lepton of the fourth
generation to be 556 GeV.
|
[
{
"created": "Mon, 29 Jan 2018 00:19:35 GMT",
"version": "v1"
},
{
"created": "Sat, 30 Jun 2018 02:52:50 GMT",
"version": "v2"
}
] |
2018-07-03
|
[
[
"Kitabayashi",
"Teruyuki",
""
],
[
"Matsumura",
"Hirona",
""
],
[
"Minakuchi",
"Kantaro",
""
],
[
"Ozaki",
"Hiroshi",
""
]
] |
We propose $S_4$ symmetric four-generation models for charged leptons. Although an $S_4$ symmetric four-generation model has been already proposed, there are some additional symmetries in the model. We construct four-generation models for charged leptons with only requirement of exact $S_4$ symmetry. It turned out that at least one of the models is consistent with observations of charged lepton masses and predicts the mass of the charged lepton of the fourth generation to be 556 GeV.
|
1808.07867
|
Christopher Lee
|
Guido Bell, Andrew Hornig, Christopher Lee, Jim Talbert
|
$e^+ e^-$ angularity distributions at NNLL$^\prime$ accuracy
|
51 pages + appendices, 18 figures. v2: minor clarifications and
corrections, references updated. v3: version published in JHEP
|
JHEP 01 (2019) 147
|
10.1007/JHEP01(2019)147
|
SI-HEP-2018-19, LA-UR-18-24071, DESY 18-083
|
hep-ph hep-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present predictions for the $e^{+}e^{-}$ event shape angularities at
NNLL$^{\prime}$ resummed and $\mathcal{O}(\alpha_s^{2})$ matched accuracy and
compare them to LEP data at center-of-mass energies $Q=91.2$ GeV and $Q=197$
GeV. We perform the resummation within the framework of Soft-Collinear
Effective Theory, and make use of recent results for the two-loop angularity
soft function. We determine the remaining NNLL$^{\prime}$ and
$\mathcal{O}(\alpha_s^2)$ ingredients from a fit to the EVENT2 generator, and
implement a shape function with a renormalon-free gap parameter to model
non-perturbative effects. Using values of the strong coupling $\alpha_s(m_Z)$
and the universal non-perturbative shift parameter $\Omega_1$ that are
consistent with those obtained in previous fits to the thrust and $C$-parameter
distributions, we find excellent agreement between our predictions and the LEP
data for all angularities with $a\in[-1,0.5]$. This provides a robust test of
the predictions of QCD, factorization, and the universal scaling of the
non-perturbative shift across different angularities. Promisingly, our results
indicate that current degeneracies in the $\{\alpha_s(m_Z),\Omega_1\}$
parameter space could be be alleviated upon fitting these parameters to
experimental data for the angularity distributions.
|
[
{
"created": "Thu, 23 Aug 2018 17:58:26 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Sep 2018 22:45:20 GMT",
"version": "v2"
},
{
"created": "Mon, 28 Jan 2019 19:24:08 GMT",
"version": "v3"
}
] |
2019-01-30
|
[
[
"Bell",
"Guido",
""
],
[
"Hornig",
"Andrew",
""
],
[
"Lee",
"Christopher",
""
],
[
"Talbert",
"Jim",
""
]
] |
We present predictions for the $e^{+}e^{-}$ event shape angularities at NNLL$^{\prime}$ resummed and $\mathcal{O}(\alpha_s^{2})$ matched accuracy and compare them to LEP data at center-of-mass energies $Q=91.2$ GeV and $Q=197$ GeV. We perform the resummation within the framework of Soft-Collinear Effective Theory, and make use of recent results for the two-loop angularity soft function. We determine the remaining NNLL$^{\prime}$ and $\mathcal{O}(\alpha_s^2)$ ingredients from a fit to the EVENT2 generator, and implement a shape function with a renormalon-free gap parameter to model non-perturbative effects. Using values of the strong coupling $\alpha_s(m_Z)$ and the universal non-perturbative shift parameter $\Omega_1$ that are consistent with those obtained in previous fits to the thrust and $C$-parameter distributions, we find excellent agreement between our predictions and the LEP data for all angularities with $a\in[-1,0.5]$. This provides a robust test of the predictions of QCD, factorization, and the universal scaling of the non-perturbative shift across different angularities. Promisingly, our results indicate that current degeneracies in the $\{\alpha_s(m_Z),\Omega_1\}$ parameter space could be be alleviated upon fitting these parameters to experimental data for the angularity distributions.
|
2202.04618
|
Angel Salvador Miramontes L\'opez
|
\'Angel S. Miramontes, Reinhard Alkofer, Christian S. Fischer and
H\`elios Sanchis-Alepuz
|
Electromagnetic and strong isospin breaking in light meson masses
|
9 pages, 2 figures
| null |
10.1016/j.physletb.2022.137291
| null |
hep-ph hep-lat nucl-th
|
http://creativecommons.org/licenses/by/4.0/
|
We study electromagnetic as well as strong isospin breaking effects in the
isospin mass splittings of light pseudoscalar and vector mesons. To this end we
employ a coupled system of quark Dyson-Schwinger and meson Bethe-Salpeter
equations whose interaction kernels contain gluon, pion and photon exchange
interactions. In bound states, QCD-induced isospin breaking is manifest on
different levels. On the one hand, a different explicit up- and down-quark mass
directly affects the propagators of the constituent quarks. On the other hand,
it leads to different interaction kernels within the isospin multiplets. In
addition, electromagnetic isospin breaking is induced via a photon exchange
diagram. Using the kaon iso-doublet and the charged pion masses as input to
determine the up, down and strange quark masses we find for the pion, kaon and
rho meson mass splittings different patterns each. In particular, our results
provide evidence that the effects from two sources of mass splittings, the
different quark masses and the different quark charges, do not add up linearly.
|
[
{
"created": "Wed, 9 Feb 2022 18:27:39 GMT",
"version": "v1"
}
] |
2022-07-20
|
[
[
"Miramontes",
"Ángel S.",
""
],
[
"Alkofer",
"Reinhard",
""
],
[
"Fischer",
"Christian S.",
""
],
[
"Sanchis-Alepuz",
"Hèlios",
""
]
] |
We study electromagnetic as well as strong isospin breaking effects in the isospin mass splittings of light pseudoscalar and vector mesons. To this end we employ a coupled system of quark Dyson-Schwinger and meson Bethe-Salpeter equations whose interaction kernels contain gluon, pion and photon exchange interactions. In bound states, QCD-induced isospin breaking is manifest on different levels. On the one hand, a different explicit up- and down-quark mass directly affects the propagators of the constituent quarks. On the other hand, it leads to different interaction kernels within the isospin multiplets. In addition, electromagnetic isospin breaking is induced via a photon exchange diagram. Using the kaon iso-doublet and the charged pion masses as input to determine the up, down and strange quark masses we find for the pion, kaon and rho meson mass splittings different patterns each. In particular, our results provide evidence that the effects from two sources of mass splittings, the different quark masses and the different quark charges, do not add up linearly.
|
hep-ph/0702153
|
Anna-Zuzana Dubnickova
|
S.Dubnicka, A.Z. Dubnickova, E.A. Kuraev
|
Ground state $1/2^+$ octet baryon sum rules predicting a chain of
inequalities for hadron photoproduction total cross-sections on corresponding
baryons
|
Revtex, 9 pages, 1 figure
| null | null | null |
hep-ph
| null |
Sum rules are derived relating Dirac mean square radii and anomalous magnetic
moments of various couples of the ground state $1/2^+$ octet baryons with the
convergent integral of the difference of hadron photoproduction cross-sections
on the corresponding baryons. Taking into account the present knowledge of
static parameters of baryons a chain of inequalities for total hadronic
photoproduction cross-sections on baryons is found from those sum rules.
|
[
{
"created": "Thu, 15 Feb 2007 16:19:39 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Dubnicka",
"S.",
""
],
[
"Dubnickova",
"A. Z.",
""
],
[
"Kuraev",
"E. A.",
""
]
] |
Sum rules are derived relating Dirac mean square radii and anomalous magnetic moments of various couples of the ground state $1/2^+$ octet baryons with the convergent integral of the difference of hadron photoproduction cross-sections on the corresponding baryons. Taking into account the present knowledge of static parameters of baryons a chain of inequalities for total hadronic photoproduction cross-sections on baryons is found from those sum rules.
|
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