Determining neutrino mass hierarchy in an extended Left-Right model

TL;DR

This paper investigates how a TeV scale left-right symmetric model with type-II seesaw dominance can constrain the light neutrino mass scale and determine the neutrino mass hierarchy by analyzing lepton flavor violation and neutrinoless double beta decay.

Contribution

It derives bounds on the lightest neutrino mass in different hierarchies within an extended left-right model using new physics contributions to rare decays.

Findings

Bounds on light neutrino mass for normal hierarchy

Bounds on light neutrino mass for inverted hierarchy

Constraints on neutrino mass hierarchy from decay processes

Abstract

We derive the lower bound on absolute scale of lightest neutrino mass for normal hierarchy and inverted hierarchy pattern of light neutrinos by studying the new physics contributions to charged lepton flavour violating decays and neutrinoless double beta decay in the framework of a TeV scale left-right symmetric model. Neutrino mass is generated in the model via type-II seesaw dominance with the help of a heavy sterile neutrino. This scenario allows large light-heavy neutrino mixing and the mixing facilitates new channels for neutrinoless double beta decay and lepton flavour violating decays. We express all the model parameters in terms of oscillation parameters in order to constrain light neutrino mass scale and extract information on neutrino mass hierarchy.