Chong Sheng Li

Virtual effects of squark-gluino coupling on Z decays into bb

Virtual corrections of squark-gluino coupling to the process Z to bb are calculated in the minimal supersymmetric standard model. The corrections typically imply a few percent ( approximately 3%) reduction in the branching ratio; depending strongly on the gluino mass.

LEADING CORRECTIONS TO T -]H+B IN THE MINIMAL SUPERSYMMETRIC MODEL

We have computed the O( alpha mt2/mw2) correction to the top-quark decay into a charged Higgs and a bottom quark in the minimal supersymmetric standard model. The analytic expression of such a correction to the decay width is given. The numerical results are also presented. For some favourable values of parameters, the correction implies up to approximately 5% reduction in the partial width relative to the tree-level result. Finally, we have compared the correction with the EW correction in the standard model.