Probing flavor models with Ge-76-based experiments on neutrinoless double-beta decay

TL;DR

This paper explores how staged Ge-76-based neutrinoless double-beta decay experiments can test neutrino flavor models early, by combining data from multiple phases to maximize physics insights and constrain theoretical scenarios.

Contribution

It proposes a staged experimental approach with quasi background-free measurements that enhances the ability to probe neutrino flavor models early in the experiment's timeline.

Findings

Sensitivity analysis shows early phases can constrain flavor models.

Combining data from stages improves overall physics reach.

Strategy maximizes physics output while minimizing experimental costs.

Abstract

The physics impact of a staged approach for double-beta decay experiments based on Ge-76 is studied. The scenario considered relies on realistic time schedules envisioned by the GERDA and the MAJORANA collaborations, which are jointly working towards the realization of a future larger scale Ge-76 experiment. Intermediate stages of the experiments are conceived to perform quasi background-free measurements, and different data sets can be reliably combined to maximize the physics outcome. The sensitivity for such a global analysis is presented, with focus on how neutrino flavor models can be probed already with preliminary phases of the experiments. The synergy between theory and experiment yields strong benefits for both sides: the model predictions can be used to sensibly plan the experimental stages, and results from intermediate stages can be used to constrain whole groups of theoretical scenarios. This strategy clearly generates added value to the experimental efforts, while at the same time it allows to achieve valuable physics results as early as possible.