Quark mixing in the discrete dark matter model

TL;DR

This paper explores a model where dark matter stability and quark mixing are explained through a residual A4 symmetry, predicting a large third neutrino mixing angle and consistent dark matter relic density.

Contribution

It introduces a novel approach combining A4 flavor symmetry with residual Z2 symmetry to generate quark masses, CKM mixing, and dark matter stability.

Findings

CKM matrix generated via renormalisable and dimension-six operators

Predicts a large third neutrino mixing angle

Dark matter relic density within the observed range

Abstract

We consider a model in which dark matter is stable as it is charged under a Z2 symmetry that is residual after an A4 flavour symmetry is broken. We consider the possibility to generate the quark masses by charging the quarks appropriately under A4. We find that it is possible to generate the CKM mixing matrix by an interplay of renormalisable and dimension-six operators. In this set-up, we predict the third neutrino mixing angle to be large and the dark matter relic density to be in the correct range. However, low energy observables - in particular meson-antimeson oscillations - strongly limit the available parameter space.