Supersymmetric Left-Right models with Gauge Coupling Unification and Fermion Mass Universality

TL;DR

This paper investigates gauge coupling unification and fermion mass unification in supersymmetric left-right models, proposing modifications to achieve unification and analyzing the resulting phenomenology, including neutrino mass explanations.

Contribution

It introduces modified supersymmetric left-right models with added fields to achieve gauge and fermion mass unification, and explores their phenomenological implications.

Findings

Unification requires additional fields beyond minimal models.

Gauged B-L symmetry can remain unbroken down to TeV scale.

Type I seesaw naturally explains small neutrino masses.

Abstract

We explore the unification of gauge couplings and fermion masses in two different types of supersymmetric left-right models, one with Higgs triplets and the other with both Higgs triplets as well as bitriplets. The minimal versions of these models do not give rise to the desired unification and some extra fields have to be added. After such a modification, it is possible in one model to get gauged $B-L$ symmetry to be unbroken down to TeV scale. We also identify the parameter space at the electroweak scale which gives rise to fermion mass unification at a high scale $M_{G}$. Type I seesaw emerges as the natural explanation of the small neutrino masses in both the models.