Dark Matter and Lepton Flavour Violation in a Hybrid Neutrino Mass Model

TL;DR

This paper introduces a hybrid neutrino mass model combining seesaw and loop contributions, linking neutrino data with dark matter stability and lepton flavor violation, and analyzing its experimental implications.

Contribution

It proposes a novel hybrid model with an extra U(1) symmetry that stabilizes dark matter and connects neutrino masses with lepton flavor violation and electroweak observables.

Findings

Model compatible with current experimental limits

Large Yukawa couplings are feasible and near detection thresholds

Correlations between neutrino data, dark matter, and rare decays

Abstract

We describe a hybrid model in which the light neutrino mass matrix receives both tree-level seesaw and loop-induced contributions. An additional U(1) gauge symmetry is used to stabilize the lightest right-handed neutrino as the Dark Matter candidate. After fitting the experimental neutrino data, we analyze and correlate the phenomenological consequences of the model, namely its impact on electroweak precision measurements, the Dark Matter relic abundance, lepton flavour violating rare decays and neutrinoless double beta decay. We find that natural realizations of the model characterized by large Yukawa couplings are compatible with and close to the current experimental limits.