Lepton Flavor Violation in SUSY GUT Model with Non-universal Sfermion Masses

We analyze lepton flavor violating τ → μγ and μ → eγ processes in SUSY GUT model in which sfermions have special mass spectrum. It is assumed that only third generation sfermions which are contained in 10(Q,Uc,Ec) of SU(5) can have a different mass from the others. This mass spectrum is led from E6 GUT model with horizontal symmetries. It is shown that branching ratios of τ → μγ and μ → eγ depend strongly on a right-handed stau mass. The weak scale stability requires the light stau, so large decay rates can be expected in this scenario. When stau is around 150 GeV and tan β ∼ 10, the branching ratios can be larger than Br(τ → μγ) ≃ 10−8 and Br(μ → eγ) ≃ 5× 10−12, which are within reach of future experiments. In addition, this model has an interesting feature that the final state charged lepton tends to have the right-handed chirality.