b→s transitions:: A new frontier for indirect supersymmetry searches -: art. no. 075016

The present unitarity triangle fit, whose essential input is represented by the s-->d and b-->d transition processes, fully agrees with the SM. However, most of the phenomena involving b-->s transitions are still largely unexplored and hence b-->s phenomenology still constitutes a place for new physics manifestations, in spite of the tremendous experimental and theoretical progress on B-->X(s)gamma. We perform a systematic study of the CP conserving and violating supersymmetry (SUSY) contributions to b-->s processes in a generic minimal supersymmetric standard model (MSSM). We consider gluino exchange contributions including next-to-leading order QCD corrections and lattice hadronic matrix elements for DeltaB=2 and DeltaB=1 processes. We take into account all available experimental information on processes involving b-->s transitions (B-->X(s)gamma, B-->X(s)l(+)l(-) and the lower bound on the B-s-(B) over bar (s) mass difference DeltaM(s)). We study the correlations among the relevant observables under scrutiny at present or in a not too far future: DeltaM(s) and the amount of CP violation in B-->phiK(s), B-s-->J/psiphi, B-->X(s)gamma. In particular we discuss the recent data by BaBar and BELLE on the time-dependent CP asymmetry in the decay B-->phiK(S) which suggest a deviation from the SM expectation. Our results show that the processes involving b-->s transitions represent a splendid opportunity to constrain different MSSM realizations, and, even more important, that they offer concrete prospects to exhibit SUSY signals at B factories and hadron colliders in spite of all the past frustration in flavor changing neutral current searches of new physics hints.