Supersymmetric Models and Neutrino Masses

TL;DR

This paper explores how supersymmetric see-saw models connect neutrino masses, lepton flavor violation, and baryogenesis, highlighting their potential to unify explanations for neutrino phenomena and the universe's matter-antimatter asymmetry.

Contribution

It analyzes the relationships between different see-saw models within supersymmetry and their implications for neutrino masses, lepton flavor violation, and baryon asymmetry.

Findings

Type II see-saw can generate lepton asymmetry for leptogenesis.

Reconstruction of high-energy parameters from neutrino data is partially feasible.

Grand Unification SUSY models support various see-saw mechanisms.

Abstract

Lepton flavour violation and neutrino masses are a signal for new Physics beyond the Standard Model and are deeply related. The minimal extension of the Standard Model to make it include neutrino masses is not satisfactory from a conceptual point of view, since it requires a severe fine-tuning of Yukawa couplings. See-saw models provide a consistent and natural mechanism to generate neutrino masses and require Physics beyond the Standard Model. In this thesis, the connections between models for neutrino masses and processes that violate lepton flavour are explored. The reconstruction of high energy parameters from neutrino data is partially possible within the framework of these see-saw models and it is enhanced by the knowledge of phenomena outside the neutrino sector, as it is the case of lepton number violation processes. Grand Unification SUSY models offer a consistent theoretical framework for Type I, Type II and Type III see-saw models. On the other hand, Type II see-saw has the attractive feature of producing a lepton asymmetry through triplet decays which can be converted into a baryon asymmetry with leptogenesis. Thus being, we studied a model to explain the baryonic density of the Universe constrained by the phenomenological neutrino data.