Tai-Fu Feng

Two-loop supersymmetric corrections to lepton anomalous magnetic and electric dipole moments

Using the effective Lagrangian method, we analyze the electroweak corrections to the anomalous dipole moments of leptons from some special two-loop topological diagrams which are composed of neutralino-slepton (chargino-sneutrino) in the minimal supersymmetric extension of the standard model (MSSM). Considering the translational invariance of the inner loop momenta and the electromagnetic gauge invariance, we get all dimension six operators and derive their coefficients. After applying equations of motion to the external leptons, the anomalous dipole moments of leptons are obtained. The numerical results imply that there is a parameter space where the two-loop supersymmetric corrections to the muon anomalous dipole moments may be significant.

Complete analysis of the next-to-leading order supersymmetric QCD corrections to B-0-(B)over-bar(0) mixing

We present a complete next-to-leading-order calculation of the QCD corrections to B-0-(B) over bar (0) (K-0-(K) over bar (0)) mixing in the framework of minimal flavor violating supersymmetry. We take into account the contributions from the gluino and find that the gluino-mediated corrections modify the leading order result obviously even when the mass of the gluino m(g)(-)much greater thanm(w). In general, one cannot neglect gluino contributions.

Two-loop gluino contributions to the neutron electric dipole moment in the CP-violating minimal supersymmetric standard model

We analyze two-loop gluino corrections to the neutron electric dipole moment (EDM) in the minimal supersymmetry extension of the standard model (MSSM). The dependence of two-loop corrections on the relevant CP violating phases differs from that of the one-loop contributions, and there is a region in the parameter space where the two-loop contributions are comparable with the one-loop contributions. Our numerical results show that the two-loop corrections can be as large as 30% of the one-loop results.

Anomalous Higgs–top-quark couplings in the MSSM

The anomalous couplings of the top quark and the Higgs boson has been studied in an effective theory resulting in the framework of the minimal supersymmetric extension of the standard model (MSSM) when the heavy fields are integrated out. Constraints on the parameters of the model from the experimental data on the ratio

Two-loop gluino corrections to the inclusive decay B → X s γ in the C P violating MSSM with large tan β

R_b={\Gamma(Z\to b\bar{b})/\Gamma(Z\to hadrons)}

Mixing among the neutral Higgs bosons and rare B decays in the CP violating MSSM

are derived.

Two-loop gluino corrections to the inclusive

We investigate two-loop gluino corrections to the effective Lagrangian for

B\to X_{_s}\gamma

b\to s+\gamma(g)

decay in CP violating MSSM with large

in the minimal supersymmetric extension of the standard model (MSSM) at large

\tan\beta

\tan\beta