The Electroweak Correction of Decay H → bb in Standard Model

We reevaluated the decay H → bb up to one-loop order of electroweak corrections in standard model with the nowadays parameters, determined by the best measurements including thelatest ones from LEP and SLC. Within error range of the CDF measurement of top-quark; mass, the electroweak correction reduces the decay width less than 0.7% and the correction value varies in the range of 0.5%.     

Electroweak radiative corrections to $$W^+W^-\gamma $$ production at the ILC

We consider holographic superconductors in a rotating black string spacetime. In view of the mandatory introduction of the \(A_\varphi \) component of the vector potential we are left with three equations to be solved. Their solutions show that the rotation parameter \(a\) influences the critical temperature \(T_\mathrm{c}\) and the conductivity \(\sigma \) in a simple but non-trivial way.     

Probing R-parity Violating Interactions via pp^-→eμ＋X Channel on Tevatron

We investigate the lepton flavor violation processes pp→eμX induced by R-parity violating interactions at the Tevatron hadron collider. The theoretical calculation and Monte Carlo simulation demonstrate that with a set of suitable cuts on experimental observables, one might be capable to reduce the standard model physical background to a controllable level so that the signals of R-parity violating interactions could be detected distinctively. Furthermore, clear sneutrino information can be abstracted from the purified event sample where other SUSY scalar quark ``pollution' is heavily suppressed. We conclude that with a reasonable assumption of 10 fb^-1 integrated luminosity, the experiments at the Tevatron machine would have potential to discover sneutrino in the region of m_{\tilde{ν}}≤400 GeV via lepton flavor violation eμ production channels, or extend the mass scale constraint up to m_{\tilde{ν}}≥ 550 GeV at 95% CL.     

e+e?γ production at photon-photon colliders at complete electroweak NLO accuracy

We present the NLO electroweak radiative corrections to the \begin{document}$ e^+e^-\gamma $\end{document} production in γγ collision, which is an ideal channel for calibrating the beam luminosity of a Photon Linear Collider. We analyze the dependence of the total cross section on the beam colliding energy, and then investigate the kinematic distributions of final particles at various initial photon beam polarizations at EW NLO accuracy. The numerical results indicate that the EW relative corrections to the total cross section are non-negligible and become increasingly significant as the increase of the beam colliding energy, even can exceed –10% in the \begin{document}${{J}} = 2$\end{document} γγ collision at \begin{document}$ \sqrt{\hat{s}} = 1\; {\rm{TeV}} $\end{document}. Such EW corrections are very important and should be taken into consideration in precision theoretical and experimental studies at high-energy γγ colliders.     

Probe R-Parity Violating Supersymmetry in Forward--Backward Asymmetry

We investigate the possibility of probing R-parity violating interactions in forward-backward asymmetries, and conclude that the Tevatron collider is the best place to measure new interactions involving the first generation of quarks. With additional down type squark ~dk contributions, the charge asymmetry in e＋e— events around Z-pole mass region at the Tevatron will be sensitive to R-parity violating couplings λ’11k, which was inaccessible to the LEP Qfb had inclusive measurement. Assuming no apparent deviation from SM prediction is observed, λ’11k〈 0.19 at 95% C.L. with squark mass Mdk=100 GeV can be derived.     

The Decay H0 → W+W- in the Two-Higgs-Doublet Model

The additional weak corrections at one-loop level to process H₀ → W⁺W^- in the two-fliggsdoublet model are calculated. The corrections from the extra Higgs sector depend strongly on the masses of Higgs sectors and the ratio of vacuum expectation values tanβ. It is shown that the general two-Higgs-doublet model admits flexibility in adjusting the one-loop corrections for the decay. In particular, for the heavy Ho boson the additional corrections imply a 5~14% reduction, when M_Ho < 1 TeV, due to relative light H₁ mass and heavy H₂, Φ masses which we used.     

SUSY—QCD Corrections to B^0—B^0 Mixing

We study the SUSY-QCD corrections to B^0-B^0 mixing with a reasonable SUSY parameter space and find that contribution from gluio is proportional to log(mg/μω) where μω is the weak interaction energy scale and by no means negligible.     

Top Quark Flavor Changing Decay t→ cH^0 in Little Higgs Model

We study theoretically the quantum effects of the littlest Higgs model （LH） mediated by flavor changing one-loop Feynman diagrams on the rare decay process t→ cH^0. The comparison of the decay width in the LH model with that in the standard model （SM） is made. We find that the decay branch ratio of t→ cH^0 in the LH model is at most of the order-10^-12, which is two order larger than in the SM. The numerical results show that the difference between the branch ratios in the LH model and the SM is generally sensitive to the LH model parameters, such as symmetry breaking scale f, Higgs boson mass mH0, and x=v＇4f/v^2 in our chosen parameter space, but relatively insensitive to the value choice of the cosine of the mixing angle c and the ratio λ1/λ2.