TeV scale double seesaw in left-right symmetric theories

TL;DR

This paper proposes a novel double seesaw mechanism within left-right symmetric theories to generate neutrino masses, featuring TeV-scale particles that are potentially testable at colliders and relevant for leptogenesis.

Contribution

It introduces a next-to-minimal left-right symmetric model with a double seesaw mechanism, incorporating TeV-scale triplet fermions and right-handed neutrinos for the first time.

Findings

TeV-scale triplet fermions and right-handed neutrinos are viable in the model.

The model's particles are potentially observable at collider experiments.

Heavy fermion decays can lead to leptogenesis, explaining matter-antimatter asymmetry.

Abstract

We extend the Type I and Type III seesaw mechanisms to generate neutrino masses within the left-right symmetric theories where parity is spontaneously broken. We construct a next to minimal left-right symmetric model where neutrino masses are generated through a variant $double$ seesaw mechanism. In our model at least one of the triplet fermions and the right handed neutrinos are at TeV scale and others are heavy. The phenomenological aspects and testability of the TeV scale particles at collider experiments are discussed. The decays of heavy fermions leading to leptogenesis are pointed out.