Neutrino-less double beta decay in the $\nu$ Standard Model

TL;DR

This paper analyzes the potential of current and future neutrinoless double beta decay experiments to detect Majorana neutrino masses within a comprehensive 3+3 Type-I seesaw model across a wide range of right-handed neutrino mass scales.

Contribution

It provides a detailed study of the 3+3 Type-I seesaw model's implications for neutrinoless double beta decay, updating experimental constraints and illustrating discovery prospects.

Findings

Current and next-generation experiments have broad discovery potential.

The model allows for detectable signals in both normal and inverted neutrino mass orderings.

Constraints from various experiments shape the viable parameter space.

Abstract

We perform a comprehensive study of the $3+3$ Type-I seesaw model for a broad range of right-handed mass scales (from keV to 10 TeV). We take into account and, in some cases, update the constraints from a large number of high- and low-energy experiments and study the implications on neutrino-less double beta ($0\nu\beta\beta$) decay experiments. We illustrate our findings through profile likelihood plots for the half-life $T_{1/2}^{0\nu}$ and two-dimensional plots correlating $T_{1/2}^{0\nu}$ to neutrino masses. We find that in this simple class of models for Majorana neutrino masses, current and next-generation $0\nu\beta\beta$ decay experiments have a broad discovery potential in both the normal and inverted orderings of the spectrum of light active neutrinos.