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N1+N2-leptogenesis in Δ(27) with a universal texture zero

26 Jul 2019, 17:20
20m
2210 room of the 2nd Teaching building (USTC)

2210 room of the 2nd Teaching building

USTC

Speaker

Aurora Melis

Description

We investigate the possibility of viable leptogenesis in an appealing Δ(27) model with a universal texture zero. The model accommodates the mass spectrum, mixing and CP phases for both quarks and leptons and allows for grand unification. Flavoured Boltzmann equations for the lepton asymmetries are solved numerically, taking into account both N1 and N2 right-handed neutrino decays. We show that leptogenesis is separately possible in either the N1 and N2 dominated scenarios, with the asymmetry in the electron flavour protected from the N1-washout by the texture zero. The two viable regions of the parameter space are M1[109,1012], with M1/M2[0.002,0.1], and M1[109,1010], with M1/M2<0.002 and M2 relatively close to M3, which however is not a natural expectation of the Δ(27) model. We conclude that the N1-dominated scenario is successful and the most natural option for the model.

Authors

Aurora Melis Fredrik Bjorkeroth Ivo de Medeiros Varzielas (CFTP, IST, University of Lisbon) María Luisa López Ibáñez (Università di Roma Tre) Oscar Manuel Vives Garcia (Univ. of Valencia and CSIC (ES))

Presentation materials