Bd,s0-B¯d,s0 mixing and lepton flavour violation in SUSY GUTs: Impact of the first measurements of ϕs

In this work we re-examine the correlation between Bd,s0-B¯d,s0 mixing and lepton flavour violation in the light of recent experimental measurements in the Bs system. We perform a generic SUSY analysis of the allowed down squark mass insertion parameter space. In the SUSY GUT scenario this parameter space is then used to make predictions for LFV branching ratios. We find that the recent measurement for the CP phase ϕs excludes the lowest rates for τ→μγ and provides a lower bound of ∼3×10−9 for tanβ=10. Future experimental improvements in the bound on τ→μγ and the measurement of ϕs will constitute a strong test of the SUSY GUT scenario.