Impact of recent updates to neutrino oscillation parameters on the effective Majorana neutrino mass in 0$\nu\beta\beta$ Decay

TL;DR

This paper assesses how recent neutrino oscillation data and cosmological constraints impact the expected signals in neutrinoless double-beta decay experiments, highlighting the experimental prospects for both neutrino mass hierarchies.

Contribution

It provides updated calculations of the effective Majorana neutrino mass and decay half-lives based on the latest oscillation and cosmological data, informing future experimental sensitivities.

Findings

Normal hierarchy neutrino mass sum ~0.06 eV/c²

Inverted hierarchy neutrino mass sum ~0.102 eV/c²

Upcoming experiments can probe IH and NH scenarios effectively

Abstract

We investigate how recent updates to neutrino oscillation parameters and the sum of neutrino masses influence the sensitivity of neutrinoless double-beta (0$\nu\beta\beta$) decay experiments. Incorporating the latest cosmological constraints on the sum of neutrino masses and laboratory measurements on oscillations, we determine the sum of neutrino masses for both the normal hierarchy (NH) and the inverted hierarchy (IH). Our analysis reveals a narrow range for the sum of neutrino masses, approximately 0.06 eV/c$^2$ for NH and 0.102 eV/c$^2$ for IH. Utilizing these constraints, we calculate the effective Majorana masses for both NH and IH scenarios, establishing the corresponding allowed regions. Importantly, we find that the minimum neutrino mass is non-zero, as constrained by the current oscillation parameters. Additionally, we estimate the half-life of 0$\nu\beta\beta$ decay using these effective Majorana masses for both NH and IH. Our results suggest that upcoming ton-scale experiments will comprehensively explore the IH scenario, while 100-ton-scale experiments will effectively probe the parameter space for the NH scenario, provided the background index can achieve 1 event/kton-year in the region of interest.