Fermion masses, Leptogenesis and Supersymmetric SO(10) Unification

TL;DR

This paper demonstrates how supersymmetric SO(10) models with additional singlets can simultaneously explain large lepton mixing angles, small quark mixing angles, and generate sufficient baryon asymmetry through leptogenesis, all consistent with current neutrino data.

Contribution

It introduces a supersymmetric SO(10) framework with extra singlets that unifies neutrino mixing, quark mixing, and leptogenesis without the gravitino problem.

Findings

Large lepton mixing angles achieved with small quark mixing angles.

Successful thermal leptogenesis at relatively low scales.

Compatibility with neutrino oscillation CP violation measurements.

Abstract

Current neutrino oscillation data indicate the existence of two large lepton mixing angles, while Kobayashi-Maskawa matrix elements are all small. Here we show how supersymmetric SO(10) with extra chiral singlets can easily reconcile large lepton mixing angles with small quark mixing angles within the framework of the successful Fritzsch ansatz. Moreover we show how this is fully consistent with the thermal leptogenesis scenario, avoiding the so-called gravitino problem. A sizeable asymmetry can be generated at relatively low scales. We present our results in terms of the leptonic CP violation parameter that characterizes neutrino oscillations.