Tri-bi-maximal mixing in viable family symmetry unified model with extended seesaw

TL;DR

This paper proposes a Grand Unified SO(10) model with Delta(27) family symmetry that successfully fits fermion masses and mixings, utilizing an extended seesaw mechanism to achieve near tri-bi-maximal leptonic mixing.

Contribution

It introduces a novel SO(10) GUT model incorporating Delta(27) symmetry and an extended seesaw to explain fermion masses and leptonic mixing patterns.

Findings

Fermion masses and mixings fit well with experimental data.

Leptonic mixing is approximately tri-bi-maximal.

The extended seesaw mechanism is crucial for mixing generation.

Abstract

We present a Grand Unified model based on SO(10) with a Delta(27) family symmetry. Fermion masses and mixings are fitted and agree well with experimental values. An extended seesaw mechanism plays a key role in the generation of the leptonic mixing, which is approximately tri-bi-maximal.