Neutrino Mass Sum Rules

TL;DR

This paper investigates the robustness of neutrino mass sum rules in flavour models, analyzing how corrections and renormalisation group effects influence their predictive power for neutrino properties.

Contribution

It extends previous work by examining the impact of model-dependent corrections and renormalisation effects on neutrino mass sum rules, confirming their robustness under most conditions.

Findings

Renormalisation group effects have limited impact on sum rules.

Large model-dependent corrections can alter predictions at high neutrino masses.

Sum rules remain generally robust, supporting their use in testing flavour models.

Abstract

Neutrino mass sum rules are an important class of predictions in flavour models relating the Majorana phases to the neutrino masses. This leads, for instance, to enormous restrictions on the effective mass as probed in experiments on neutrinoless double beta decay. While up to now these sum rules have in practically all cases been taken to hold exactly, we will go here beyond that. While the effect of the renormalisation group running can be visible, the qualitative features do not change. This changes somewhat for model dependent corrections which might alter even the qualitative predictions but only for large corrections and a high neutrino mass scale close to the edge of the current limits. This finding backs up the solidity of the predictions derived in the literature apart from some exceptions, and it thus marks a very important step in deriving testable and robust predictions from neutrino flavour models.