Type I and $new$ seesaw in left-right symmetric theories

TL;DR

This paper introduces a new seesaw mechanism in left-right symmetric theories that allows for low B-L breaking scale, resulting in TeV-scale particles with potential observable effects at the LHC.

Contribution

It proposes a novel seesaw mechanism that decouples neutrino mass generation from the B-L scale in left-right symmetric models.

Findings

B-L gauge boson and heavy leptons can be at TeV scale.

The model predicts observable signatures at the LHC.

Neutrino masses are independent of B-L breaking scale.

Abstract

We extend the Type I seesaw and suggest a $new$ seesaw mechanism 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 determined irrespective of the B-L breaking scale and call it the $new$ seesaw mechanism. In this scenario B-L scale can be very low. This makes B-L gauge boson and the quasi-Dirac $heavy$ leptons very light. These TeV scale particles could have large impact on lepton flavor and CP violating processes. We also shed light on the phenomenological aspects of the model within the reach of the LHC.