The Effects from the Complex Parameters on t → ch0 Within the Minimal Supersymmetric Standard Model**The project supported in part by National Natural Science Foundation of China and a grant from the University of Science and Technology of China

Abstract

We investigate the effects from complex parameters on the branching ratio (BR) of the flavor changing rare decay t → ch0 contributed by the electroweak interactions in the framework of the minimal supersymmetric standard model with complex parameters. We study the dependence of the BR on the possible relevant additional parameters which could be the original sources inducing CP-violation, i.e., the complex phase angles and in squark and chargino sectors and appearing in Cabibbo–Kobayashi–Maskawa matrix. We find that these parameters influence the BR obviously and the effects induced by and are much larger than by . With the different chosen values of the complex parameters, the BR is in the range between 10-10 and 10-8, depending mainly on the phase angles of the higgsino mass parameter and the trilinear coupling .