942 research outputs found
Muon g-2 Anomaly confronted with the higgs global data in the Left-Right Twin Higgs Models
We will examine the Left-Right Twin Higgs(LRTH) Models as a solution of muon
g-2 anomaly with the background of the Higgs global fit data. In the
calculation, the joint constrains from the theory, the precision electroweak
data, the 125 GeV Higgs data, the leptonic flavor changing decay \mu \to
e\gamma decays, and the constraints m_{\nu_R}>m_T>m_{W_H} are all considered.
And with the small mass of the \phi^0, the direct searches from the channels can impose stringent upper limits on Br(h\to
\phi^0\phi^0) and can reduce the allowed region of m_{\phi^0} and f. It is
concluded that the muon g-2 anomaly can be explained in the region of 200 GeV
\leq M\leq 500 GeV, 700 GeV \leq f\leq 1100 GeV, 13 GeV \leq m_{\phi^0}\leq 55
GeV, 100 GeV \leq m_{\phi^\pm}\leq 900 GeV, and m_{\nu_R}\geq 15 TeV after
imposing all the constraints mentioned above.Comment: 18 pages, 4 figures, some typos modifie
Light axigluon and single top production at the LHC
The light axigluon model can explain the Tevatron
forward-backward asymmetry and at the same time satisfy the constraints from
the electroweak precision measurement and the and data, which
induces the flavor changing () couplings of axigluon with the and new
quarks. We investigate the effects of these couplings on the s- and
t-channel single top productions at the and the decays , and . Our numerical
results show that the light axigluon can give significantly contributions to
single top production and the rare top decays and .Comment: 22 pages, 8 figures; references added, contributions of new quarks to
rare decay processes adde
Associated production of the heavy charged gauge boson and a top quark at LHC
In the context of topflavor seesaw model, we study the production of the
heavy charged gauge boson associated with a top quark at the LHC.
Focusing on the searching channel , we carry out a full simulation of the signal and the
relevant standard model backgrounds. The kinematical distributions of final
states are presented. It is found that the backgrounds can be significantly
suppressed by sets of kinematic cuts, and the signal of the heavy charged boson
might be detected at the LHC with TeV. With a integrated
luminosity of \LL= 100 , a signal significance can be
achieved for TeV.Comment: 16 pages, 6 figure
Bottom partner B' and Zb production at the LHC
Some new physics models, such as "beautiful mirrors" scenario, predict the
existence of the bottom partner . Considering the constraints from the data
for the branching ratio and the asymmetry
on the relevant free parameters, we calculate the contributions of
to the cross section and the polarization asymmetry
for production at the . We find that the bottom partner
can generate significant corrections to and , which might
be detected in near future.Comment: 15 pages, 5 figures. Version published in Phys. Lett.
2-(DibutylÂamino)-3-(4-fluoroÂphenÂyl)-5,6,7,8-tetraÂhydro-7-methyl-6,8-diÂphenylÂpyridineÂ[3′,4′:2,3]thieno[5,4-d]pyrimidin-4(3H)-one
In the crystal structure of the title compound, C36H39FN4OS, the two fused rings of the thienopyrimidine system are coplanar. The 4-fluoroÂphenyl ring is twisted with respect to the heterocyclic pyrimidinone ring by 67.21 (14)°. The piperidine ring shows a half-chair conformation. One of the n-butyl chains is disordered equally over two sites. The crystal packing is stabilized by C—H⋯O hydrogen bonds
Ab initio study of the giant ferroelectric distortion and pressure induced spin-state transition in BiCoO3
Using configuration-state-constrained electronic structure calculations based
on the generalized gradient approximation plus Hubbard U method, we sought the
origin of the giant tetragonal ferroelectric distortion in the ambient phase of
the potentially multiferroic material BiCoO3 and identified the nature of the
pressure induced spin-state transition. Our results show that a strong Bi-O
covalency drives the giant ferroelectric distortion, which is further
stabilized by an xy-type orbital ordering of the high-spin (HS) Co3+ ions. For
the orthorhombic phase under 5.8 GPa, we find that a mixed HS and low-spin (LS)
state is more stable than both LS and intermediate-spin (IS) states, and that
the former well accounts for the available experimental results. Thus, we
identify that the pressure induced spin-state transition is via a mixed HS+LS
state, and we predict that the HS-to-LS transition would be complete upon a
large volume decrease of about 20%.Comment: 6 pages, 6 figures, 2 table
Accretion Disk for regular black holes with sub-Planckian curvature
We investigate the accretion disk for a sort of regular black holes which are
characterized by sub-Planckian curvature and Minkowskian core. We derive null
geodesics outside the horizon of such regular black holes and analyze the
feature of the light rays from the accretion disk which can be classified into
direct emission, lensed rings, and photon rings. We find that the observed
brightness under different emission models is mainly determined by direct
emission, while the contribution from the flux of the lensed and photon rings
is limited. By comparing with Bardeen black hole with a dS core, it is found
that the black hole with a Minkowskian core exhibits distinct astronomical
optical features when surrounded by accretion disk, which potentially provides
a way to distinguish these two sorts of black holes by astronomical
observation.Comment: 26 pages,9 figure
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