Abstract
We discuss a general leptonic model based on the SU(2) L ⊗ U(1) ⊗ SU(2) R gauge group and we present general results for the ℓ → ℓ′ γ and νℓ → νℓ′ γ processes, which can be used for any model based on the SU(2) L ⊗ U(1) ⊗ SU(2) R gauge group or on any of its subgroups. The predictions of the μ → e γ branching ratio and of the neutrino lifetime for various models discussed in the literature are reviewed. The main results are summarized in tables.
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