Fermion masses and mixing with tri-bimaximal in SO(10) with type-I seesaw

TL;DR

This paper develops SO(10) grand unified models incorporating type-I and type-II seesaw mechanisms to achieve tri-bimaximal neutrino mixing, successfully fitting all fermion masses and recent experimental deviations.

Contribution

It introduces a model that combines type-I and type-II seesaw mechanisms within SO(10) to realize tri-bimaximal mixing without disrupting it, fitting all fermion data.

Findings

Achieves fit to all fermion masses and mixings

Incorporates recent T2K experimental results as deviations

Demonstrates compatibility of combined seesaw mechanisms with tri-bimaximal mixing

Abstract

We study a class of models for tri-bimaximal neutrino mixing in SO(10) grand unified SUSY framework. Neutrino masses arise from both type-I and type-II seesaw mechanisms. We use dimension five operators in order to not spoil tri-bimaximal mixing by means of type-I contribution in the neutrino sector. We show that it is possible to fit all fermion masses and mixings including also the recent T2K result as deviation from the tri-bimaximal.