# Universal Seesaw and $0\nu\beta\beta$ in new 3331 left-right symmetric model

## TL;DR

This paper proposes a novel left-right symmetric model with an extended gauge group that employs a universal seesaw mechanism for fermion masses and explores its implications for neutrinoless double beta decay at TeV scales.

## Contribution

It introduces a new class of left-right symmetric models without scalar bitriplets, utilizing vector-like fermions and a universal seesaw mechanism for fermion mass generation.

## Key findings

- Heavy-light neutrino mixing enhances $0
uetaeta$ signals at TeV scales.
- Model predicts observable $0
uetaeta$ decay in current experiments.
- Discusses symmetry breaking patterns to the Standard Model.

## Abstract

We consider a class of left-right symmetric model with enlarged gauge group $SU(3)_c \times SU(3)_L \times SU(3)_R \times U(1)_X$ without having scalar bitriplet. In the absence of scalar bitriplet, there is no Dirac mass term for fermions including usual quarks and leptons. We introduce new isosinglet vector-like fermions so that all the fermions get their masses through a universal seesaw mechanism. We extend our discussion to neutrino mass and its implications in neutrinoless double beta decay ($0\nu\beta\beta$). We show that for TeV scale $SU(3)_R$ gauge bosons, the heavy-light neutrino mixing contributes dominantly to $0\nu\beta\beta$ that can be observed at ongoing experiments. Towards the end we also comment on different possible symmetry breaking patterns of this enlarged gauge symmetry to that of the standard model.