Neutrino masses and proton decay in SO(10)

TL;DR

This paper examines constraints on SO(10) grand unified theories from proton decay limits and neutrino mass measurements, updating models with recent neutrino mixing data to derive an upper neutrino mass limit.

Contribution

It introduces an improved triangular relationship for Majorana neutrino masses incorporating current neutrino mixing parameters, refining the bounds on neutrino masses within SO(10) models.

Findings

Upper neutrino mass limit of 0.16 eV

Constraints on proton lifetime and B-L symmetry scale

Updated model with non-maximal mixing angles

Abstract

We consider the constraints on SO(10) unified models coming from the lower limits on proton lifetime and on the scale of B-L symmetry breaking within the framework of the seesaw model for neutrino masses. By upgrading a triangular relationship for the inverse of Majorana masses to the experimental situation with non maximal 2-3 mixing and non vanishing 1-3 mixing, we get for the sum of neutrino masses the upper limit 0.16 eV.