A left-right symmetric model with SU(2)-triplet fermions

TL;DR

This paper introduces a left-right symmetric model with SU(2)-triplet fermions, exploring their role in neutrino mass generation and embedding into SO(10) grand unification.

Contribution

The model incorporates SU(2)-triplet fermions with Majorana masses into a left-right symmetric framework, providing new mechanisms for neutrino mass generation.

Findings

Triplet fermions enable canonical and inverse seesaw mechanisms.

Model can be embedded into SO(10) grand unification.

Provides a unified framework for neutrino masses and grand unification.

Abstract

We consider an $SU(3)_c \otimes SU(2)_L \otimes SU(2)_R \otimes U(1)_{B-L}$ left-right symmetric model with three Higgs scalars including an $SU(2)_L$ doublet, an $SU(2)_R$ doublet and an $SU(2)_L \otimes SU(2)_R$ bidoublet. In addition to usual SU(2)-doublet fermions, our model contains SU(2)-triplet fermions with Majorana masses. The neutral components of the left-handed triplets can contribute a canonical seesaw while the neutral components of the right-handed triplets associated with the right-handed neutrinos can contribute a double/inverse-type seesaw. Our model can be embedded into an SO(10) grand unification theory where the triplets belong to the $45=(1,3,1,0) \oplus (1,1,3,0)\oplus ...$ representations.