SUPERSYMMETRIC QCD FLAVOR-CHANGING TOP-QUARK DECAY

We present a detailed and complete calculation of the gluino and scala r quarks contribution to the flavor-changing top quark decay into a ch arm quark and a photon, gluon, or a Z(0) boson within the minimal supe r-symmetric standard model including flavor-changing gluino-quark-scal ar-quark couplings in the right-handed sector. We compare the results with the ones presented in an earlier paper where we considered flavor -changing couplings only in the left-handed sector. We show that these new couplings have important consequences leading to a large enhancem ent when the mixing of the scalar partners of the left-acid right-hand ed top quark is included. Furthermore CP violation in the flavor-chang ing top quark decay will occur when a SUSY phase is taken into account .