Regular Article - Theoretical Physics
Neutrino mixing and leptogenesis in a model
Dipartimento di Scienze Matematiche e Informatiche, Scienze Fisiche e Scienze della Terra, Universita degli Studi di Messina, Via Ferdinando Stagno d’Alcontres 31, 98166, Messina, Italy
2 Dipartimento di Matematica e Fisica, Università di Roma Tre, Via della Vasca Navale 84, 00146, Rome, Italy
3 INFN Sezione di Roma Tre, Via della Vasca Navale 84, 00146, Rome, Italy
Accepted: 23 January 2023
Published online: 11 February 2023
We present a simple extension of the Standard Model with three right-handed neutrinos in a SUSY framework, with an additional abelian flavor symmetry with a non standard leptonic charge 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 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.
© The Author(s) 2023
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