51,970 research outputs found
130 GeV gamma-ray line and enhancement of in the Higgs triplet model plus a scalar dark matter
With a discrete symmetry being imposed, we introduce a real singlet
scalar to the Higgs triplet model with the motivation of explaining the
tentative evidence for a spectral feature at = 130 GeV in the Fermi
LAT data. The model can naturally satisfy the experimental constraints of the
dark matter relic density and direct detection data from Xenon100. The doubly
charged and one charged scalars can enhance the annihilation cross section of
via the one-loop contributions, and give the negligible
contributions to the relic density. for
GeV can reach \ord(1)\times10^{-27} cm^3 s^{-1} for the small
charged scalar masses and the coupling constant of larger than 1. Besides, this
model also predict a second photon peak at 114 GeV from the annihilation
, and the cross section is approximately 0.76 times that of
, which is below the upper limit reported by Fermi LAT.
Finally, the light charged scalars can enhance LHC diphoton Higgs rate, and
make it to be consistent with the experimental data reported by ATLAS and CMS.Comment: 15 pages, 4 figure
Dynamics of Gravity as Thermodynamics on the Spherical Holographic Screen
The dynamics of general Lovelock gravity, viewed on an arbitrary spherically
symmetric surface as a holographic screen, is recast as the form of some
generalized first law of thermodynamics on the screen. From this observation
together with other two distinct aspects, where exactly the same temperature
and entropy on the screen arise, it is argued that the thermodynamic
interpretation of gravity is physically meaningful not only on the horizon, but
also on a general spherically symmetric screen.Comment: 10 pages, revtex4; v2: minor corrections, references added? v3: the
summary paragraph replaced by the discussion of the general static case,
minor corrections/clarifications/modifications, references added, match the
published versio
Heavy quark spin symmetric molecular states from and other coupled channels in the light of the recent LHCb pentaquarks
We consider the states, together with and other coupled channels, and take an interaction consistent with heavy
quark spin symmetry, with the dynamical input obtained from an extension of the
local hidden gauge approach. By fitting only one parameter to the recent three
pentaquark states reported by the LHCb collaboration, we can reproduce the
three of them in base to the mass and the width, providing for them the quantum
numbers and approximate molecular structure as ,
, and , and isospin
. We find another state around 4374 MeV, of
structure, for which indications appear in the experimental spectrum. Two other
near degenerate states of and nature are also found around 4520 MeV, which although less clear,
are not incompatible with the observed spectrum. In addition, a state at the same energy appears, which however does not couple
to in wave, and hence it is not expected to show up in the LHCb
experiment.Comment: 8 page
Classes of Measures Generated by Capacities
We introduce classes of measures in the half-space
generated by Riesz, or Bessel, or Besov capacities in , and give
a geometric characterization as Carleson-type measures
gauge vector field on a codimension-2 brane
In this paper, we obtain a gauge invariant effective action for a bulk
massless gauge vector field on a brane with codimension two by using a
general Kaluza-Klein (KK) decomposition for the field. It suggests that there
exist two types of scalar KK modes to keep the gauge invariance of the action
for the massive vector KK modes. Both the vector and scalar KK modes can be
massive. The masses of the vector KK modes contain two parts,
and , due to the existence of the two extra
dimensions. The masses of the two types of scalar KK modes and
are related to the vector ones, i.e.,
and . Moreover, we
derive two Schr\"{o}dinger-like equations for the vector KK modes, for which
the effective potentials are just the functions of the warp factor.Comment: 15 pages,no figures, accepted by JHE
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