JUNO and Neutrinoless Double Beta Decay

TL;DR

The paper analyzes how JUNO's precise measurement of neutrino oscillation parameters, especially the solar mixing angle, refines predictions for neutrinoless double beta decay half-lives, impacting future experimental tests of neutrino properties.

Contribution

It demonstrates that JUNO can measure the solar neutrino mixing angle with below 1% uncertainty, significantly narrowing the predicted half-life range for neutrinoless double beta decay.

Findings

JUNO can measure the solar mixing angle with less than 1% uncertainty.

This measurement reduces the half-life prediction range by a factor of two.

Remaining uncertainty is mainly due to nuclear matrix elements.

Abstract

We study the impact of the precision determination of oscillation parameters in the JUNO experiment on half-life predictions for neutrinoless double beta decay. We show that the solar neutrino mixing angle can be measured by JUNO with below 1% uncertainty. This implies in particular that the minimal value of the effective mass in the inverted mass ordering will be known essentially without uncertainty. We demonstrate that this reduces the range of half-life predictions in order to test this value by a factor of two. The remaining uncertainty is caused by nuclear matrix elements. This has important consequences for future double beta decay experiments that aim at ruling out the inverted mass ordering or the Majorana nature of neutrinos.