Extended Minimal Flavour Violating MSSM

Abstract

The recently reported measurements of the CP asymmetry a(psi K) by the BABAR and BELLE collaborations are in good agreement with the standard model prediction. With the anticipated precision in a(psi K) at the B factories and hadron colliders, one hopes to pin down any possible deviation from the SM. We discuss an extension of the MFV-supersymmetric models which comfortably accommodates the current measurements of the CP asymmetry a(psi K), but differs from the SM due to an additional flavour changing structure beyond the CKM matrix. We analyze the compatibility of this model with present data and suggest specific tests in forthcoming experiments in B physics. In addition to the CP-asymmetries in B-meson decays and the Bs-bar(Bs) mass difference, we emphasize measurements of the radiative transition b -> d gamma as sensitive probes of the postulated flavour changing structure. Interestingly, the CKM-unitarity analysis in these models also allows solutions with gamma > pi/2, where gamma=-arg(Vub). Such large values of gamma are hinted by the current measurements of the branchig ratios for the decays B -> pi pi and B -> K pi.