Neutrino Masses and Leptogenesis in a Le − Lμ − Lτ model

We present a simple extension of the Standard Model with three right-handed neutrinos in a SUSY framework, with an additional U(1) F abelian flavor symmetry with a non standard leptonic charge for lepton doublets and arbitrary right-handed charges. We show how it is possible to provide the correct predictions for the mixing angles of the PMNS matrix and for the r = Δ m sun 2 / Δ m atm 2 parameter with a moderate fine tuning. The baryon asymmetry of the Universe is generated via thermal leptogenesis through CP-violating decays of the heavy right-handed neutrinos. We present a detailed numerical solution of the relevant Boltzmann equation accounting for the impact of the distribution of the asymmetry in the lepton flavors.