b→s transitions: A new frontier for indirect supersymmetry searches

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→Xsγ. 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 ΔB=2 and ΔB=1 processes. We take into account all available experimental information on processes involving b→s transitions (B→Xsγ, B→Xsl+l- and the lower bound on the Bs-B-bars mass difference ΔMs). We study the correlations among the relevant observables under scrutiny at present or in a not too far future: ΔMs and the amount of CP violation in B→φKs, Bs→J/ψφ, B→Xsγ. In particular we discuss the recent data by BaBar and BELLE on the time-dependent CP asymmetry in the decay B→φKS 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