Scotogenic majorana neutrino masses in a predictive orbifold theory of flavour

TL;DR

This paper explores a 6D orbifold model with $A_4$ symmetry that predicts fermion masses and neutrino phenomena, incorporating a scotogenic mechanism for Majorana neutrino masses and a dark matter candidate.

Contribution

It introduces a novel 6D orbifold compactification with $A_4$ symmetry that naturally explains flavour observables and implements a scotogenic neutrino mass mechanism.

Findings

Predicts quark and lepton mass hierarchies and mixing angles.

Provides a viable WIMP dark matter candidate.

Explains neutrino oscillation data and neutrinoless double beta decay.

Abstract

The use of extra space-time dimensions provides a promising approach to the flavour problem. The chosen compactification of a 6-dimensional orbifold implies a remnant family symmetry $A_4$. This makes interesting predictions for quark and lepton masses, for neutrino oscillations and neutrinoless double beta decay, providing also a very good global description of all flavour observables. Due to an auxiliary $\mathbb{Z}_4$ symmetry, we implement a scotogenic Majorana neutrino mass generation mechanism with a viable WIMP dark matter candidate.