Lepton flavor violation from right-handed neutrino thresholds

Charged lepton flavor violation is reappraised in the context of a supersymmetric seesaw mechanism. It is pointed out that a nontrivial flavor structure of right-handed neutrinos, whose effect has been thus far less studied, can give rise to significant slepton flavor transitions. Under the premise that the neutrino Yukawa couplings are of O ( 1 ) , the right-handed neutrino mixing contribution could form a basis of the μ → e γ amplitude, which by itself might lead to an experimentally accessible rate, given a typical low-energy sparticle spectrum. Emphasis is placed on the crucial role of the recently measured lepton mixing angle θ 13 as well as the leptonic C P -violating phases.