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

TL;DR

This paper explores strong thermal leptogenesis within an SO(10)-inspired model, predicting specific neutrino parameters and their relations, which are testable with current and upcoming experiments.

Contribution

It demonstrates that strong thermal leptogenesis in the SO(10) framework leads to testable predictions on neutrino mass ordering, mixing angles, and CP phases.

Findings

Normal neutrino mass ordering is favored.

Reactor mixing angle θ13 is predicted to be between 2° and 20°.

Effective Majorana mass m_ee is approximately 0.8 times the lightest neutrino mass.

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, $2\deg \lesssim \theta_{13} \lesssim 20\deg$, as well as a non maximal atmospheric mixing angle, $16\deg \lesssim \theta_{23} \lesssim 41\deg$, 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 0.8 \, m_1 \approx 15 $ meV.