Signatures of supersymmetry at B-factories

We discuss CP asymmetries in B-0-meson decays and B-s(0)-(B) over bar(s)(0) mixing within the framework of the supersymmetric standard model (SSM). It is shown that B-d(0)-B-d(0) and K-0-(K) over bar(0) mixings could receive sizable new contributions through box diagrams mediated by the charginos and charged Higgs bosons. This implies that the CP-violating phase of the Cabibbo-Kobayashi-Maskawa matrix may have a value which is different from the one predicted by the standard model (SM). The value of the CP-violating phase affects the amounts of the CP asymmetries and B-s(0)-(B) over bar(s)(0) mixing. We examine predictions for these quantities in both the SSM and the SM, exploring the difference between the two models.