The quest for neutrinoless double beta decay: Pseudo-Dirac, Majorana and sterile neutrinos

TL;DR

This paper investigates predictions for neutrinoless double beta decay in models with pseudo-Dirac, Majorana, and sterile neutrinos, highlighting scenarios testable by upcoming experiments and the role of cosmological constraints.

Contribution

It analyzes neutrinoless double beta decay in 3 and 3+1 neutrino frameworks, emphasizing testable predictions and the interplay with cosmological data.

Findings

Some scenarios are falsifiable by near-term experiments.

Sterile neutrinos around 1 eV can influence decay predictions.

Future experiments can probe models even with normal hierarchy.

Abstract

In this paper we analyze the neutrinoless double beta decay predictions in some scenarios with admixture of pseudo-Dirac and Majorana neutrinos in the 3 and 3+1 neutrino frameworks. We found that some of the cases can be falsifiable in near-term and future generations of neutrinoless double beta decay experiments even for the normal neutrino mass hierarchy. In the 3+1 framework we consider the sterile neutrino with a mass of the order of 1 eV. The complementarity between cosmological constraints and the future sensitivity for the next generations of the neutrinoless double beta decay searches is exploited.