Radiatively Generated Leptogenesis inS4Flavor Symmetry Models

摘要

We study how leptogenesis can be implemented in the seesaw models withS4flavor symmetry, which lead to the tri-bimaximal neutrino mixing matrix. By considering renormalization groupevolution from a high-energy scale of flavor symmetry breaking (the GUT scale is assumed) to thelow-energy scale of relevant phenomena, the off-diagonal terms in a combination of Dirac Yukawa-coupling matrix can be generated and the degeneracy of heavy right-handed neutrino Majoranamasses can be lifted. As a result, the flavored leptogenesis is successfully realized. We also investigatehow the effective light neutrino mass|〈mee〉|associated with neutrinoless double beta decay can bepredicted along with the neutrino mass hierarchies by imposing the experimental data on the low-energy observables. We find a link between the leptogenesis and the neutrinoless double beta decaycharacterized by|〈mee〉|through a high-energy CP phaseϕ, which is correlated with the low-energyMajorana CP phases. It is shown that the predictions of|〈mee〉|for some fixed parameters of thehigh-energy physics can be constrained by the current observation of baryon asymmetry.