Neutrino Masses in E_6 Unification

TL;DR

This paper demonstrates that a supersymmetric E_6 grand unification model with an anomalous U(1)_X symmetry naturally explains large neutrino mixing and mass features through a novel 'E-twisting' mechanism.

Contribution

It introduces the 'E-twisting' mechanism within an E_6 GUT framework to reproduce fermion mass matrices and neutrino properties.

Findings

Large neutrino mixing angles are naturally achieved.

The model reproduces fermion mass hierarchies.

The 'E-twisting' mechanism effectively explains neutrino masses.

Abstract

We show that the neutrino masses with large mixing between \nu_\mu and \nu_\tau are naturally reproduced in a supersymmetric E_6 grand unification model with an anomalous U(1)_X symmetry. We propose a simple scenario which incorporates a novel mechanism called `E-twisting' by which all the characteristic features of the fermion mass matrices, not only the quark/lepton's Dirac masses but also the neutrino's Majorana masses, can be well reproduced despite all the members in 27 of each generation are assigned a common U(1)_X charge.