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 Le- Lμ- Lτ for lepton doublets and arbitrary right-handed charges. Our model predicts an inverted neutrino mass hierarchy and it is able to reproduce the experimental values of the mixing angles of the PMNS matrix and of the r=Δmsun2/Δmatm2 ratio, with only a moderate fine tuning of the Lagrangian free parameters. 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 various lepton flavors.
Neutrino mixing and leptogenesis in a Le- Lμ- Lτ model
Arcadi G.;
2023-01-01
Abstract
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 Le- Lμ- Lτ for lepton doublets and arbitrary right-handed charges. Our model predicts an inverted neutrino mass hierarchy and it is able to reproduce the experimental values of the mixing angles of the PMNS matrix and of the r=Δmsun2/Δmatm2 ratio, with only a moderate fine tuning of the Lagrangian free parameters. 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 various lepton flavors.Pubblicazioni consigliate
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