Manifestaion of SUSY in B decays a

SUSY effects on various flavor changing neutral current processes are discussed in the minimal supergravity model and the SU(5) grand unified theory with righthanded neutrino supermultiplets. In particular, in the latter case the neutrino Yukawa coupling constants can be a source of the flavor mixing in the right-handeddown-type-squark sector. It is shown that due to this mixing the time-dependent CP asymmetry of radiative B decay can be as large as 30% and the ratio of Bs–B̄s mixing and Bd–B̄d mixing deviates from the prediction in the standard model and the minimal supergravity model without the neutrino interaction.