Hierarchical neutrino masses and mixing in non minimal-SU(5)

TL;DR

This paper explores a non-minimal supersymmetric SU(5) model with added superfields that produce a hierarchical neutrino mass spectrum and large mixing angles, consistent with experimental data.

Contribution

It introduces a specific non-minimal SU(5) extension that realizes a Type I+III see-saw mechanism for hierarchical neutrino masses and large mixing angles.

Findings

Hierarchical neutrino masses with m_3 > m_2 >> m_1 are achieved.

Large neutrino mixing angles b_{23} > b_{12} >> b_{13} are explained.

Extra colored states are kept at high scales to ensure proton stability.

Abstract

We consider the problem of neutrino masses and mixing within the framework of a non-minimal supersymmetric SU(5) model extended by adding a set of 1,24 chiral superfields accommodating three right-handed neutrinos. A Type I+III see-saw mechanism can then be realized giving rise to a hierarchical mass spectrum for the light neutrinos of the form m_3> m_2>> m_1 consistent with present data. The extra colored states are pushed to the unification scale by proton stability constraints, while the intermediate see-saw energy scale and the unification scale are maintained in phenomenologically acceptable ranges. We also examine the issue of large neutrino mixing hierarchy \theta_{23}> \theta_{12}>> \theta_{13} in the above framework of hierarchical neutrino masses.