IMPACT OF DIFFERENT CLASSES OF SUPERSYMMETRIC MODELS ON RARE B DECAYS, B0-BBAR0 MIXING AND CP-VIOLATION

We analyze how different classes of supersymmetric extensions of the Standard Model can affect radiative B decays, B(O) - BBAR(O) mixing and CP-violation in nonleptonic as well as semileptonic B decays. We include radiative QCD corrections that typically provide sizeable enhancements for DELTA-B = 2 operators, adopt values of 100-150 GeV for gluino and squark masses and incorporate constraints provided by epsilon-K and B(d) - BBAR(d) mixing to obtain the following results: (i) BR(b --> s-gamma) can be enhanced over the Standard Model prediction up to the present tentative "experimental" bound. (ii) The rate of B(s) - BBAR(s) mixing can be enhanced such that even x(B(s)) >> 10 becomes conceivable. (iii) CP asymmetries of order 10-50% can arise in the KM favoured B(s) --> psi-phi mode. (iv) The pattern expected within the Standard Model for CP asymmetries in B(d) --> psi-K(s) vs. B(d) --> pi+ pi- vs. B(s) --> phi-rho etc. decays can be modified in a significant way. (v) CP-violation in semileptonic B(O) decays could reach the 1% level.