Strong thermal Leptogenesis: an exploded view of the low energy neutrino parameters in the SO(10)-inspired model

Abstract

Leptogenesis is an attractive scenario in which neutrino masses and baryon asymmetry of the Universe are explained together under a minimal set of assumptions. After formulating the problem of initial conditions and introducing the strong thermal leptogenesis conditions as solution, we show that, within the framework provided by the \soten~model of leptogenesis, the latter lead to a set of testable predictions on the same neutrino parameters currently under experimental investigations. The emerging scenario selects the normal ordering of the neutrino mass pattern, a large value for the reactor mixing angle, $2\mathrm{deg}\lesssim {\theta }_{13}\lesssim 20\mathrm{deg}$, as well as a non maximal atmospheric mixing angle, $16\mathrm{deg}\lesssim {\theta }_{23}\lesssim 41\mathrm{deg}$, and favours negative values for the Dirac phase \delta. The signature of the proposed strong thermal \soten~solutions is in the relation obtained between the effective Majorana mass and the lightest neutrino mass: $m_{ee}\approx 0.8m_1\approx 15$ meV.

Comments: Proceedings for the XXX-th International Workshop on High Energy Physics "Particle and Astroparticle Physics, Gravitation and Cosmology: Predictions, Observations and New Projects", June 23-27 2014, Protvino, Russia