We investigate the possibility of viable leptogenesis in an appealing 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 and right-handed neutrino decays. We show that leptogenesis is separately possible in either the and dominated scenarios, with the asymmetry in the electron flavour protected from the -washout by the texture zero. The two viable regions of the parameter space are , with , and , with and relatively close to , which however is not a natural expectation of the model. We conclude that the -dominated scenario is successful and the most natural option for the model.
Authors
Aurora MelisFredrik BjorkerothIvo 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))