Leptogenesis from U(1) flavor symmetry
November 21, 2022
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. The model is able to reproduce the experimental values of the mixing angles of the PMNS matrix and of the 𝑟 = Δ𝑚^2sun/Δ𝑚^2atm 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 Equations (BE).
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