Bs→μ+μ− in supersymmetric grand unified theories

We investigate the recent CDF measurement of the Br(Bs→μ+μ−) 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 τ→μγ for a large CP phase in the Bs-B¯s mixing. Recall that there have been indication for a large CP phase in Bs mixing from Bs→J/ψϕ (Tevatron and LHCb) and dimuon asymmetry (D0). We also predict Br(τ→μη) for the possible range of values of Br(τ→μγ).