Bs → μ+μ- in supersymmetric grand unified theories

We investigate the recent CDF measurement of the Br(B-s -> mu(+)mu(-)) which shows excess over the Standard Model. We consider minimal supergravity motivated models (mSUGRA)/CMSSM and grand unified models, SU(5) and SO(10). In the grand unified models, the neutrino mixings provide an additional source of squark flavor violation through the quark-lepton unification. In the context of minimal SU(5) model, we find that the new CDF measurement has imposed a lower bound on the branching ratio of tau -> mu gamma for a large CP phase in the B-s-(B) over bar (s) mixing. Recall that there have been indication for a large CP phase in B-s mixing from Bs -> J/Psi phi, (Tevatron and LHCb) and dimuon asymmetry (DO). We also predict Br(tau -> mu eta) for the possible range of values of Br(tau ->mu gamma) (C) 2011 Elsevier B.V. All rights reserved.