An A4 x Z4 model for neutrino mixing

TL;DR

This paper extends an A4 x U(1) flavor model to incorporate a nonzero reactor angle in neutrino mixing, avoiding sequestering issues and allowing for potential dark matter candidates.

Contribution

It introduces a minimal modification to the A4 x U(1) model to achieve realistic neutrino mixing angles without large RG effects.

Findings

Achieves nonzero theta13 ~ 0.1 in the model

Circumvents sequestering by avoiding superheavy scales

Allows for a dark matter candidate with Z4 charge

Abstract

The A4 x U(1) flavor model of He, Keum, and Volkas is extended to provide a minimal modification to tribimaximal mixing that accommodates a nonzero reactor angle theta13 ~ 0.1. The sequestering problem is circumvented by forbidding superheavy scales and large coupling constants which would otherwise generate sizable RG flows. The model is compatible with (but does not require) a stable or metastable dark matter candidate in the form of a complex scalar field with unit charge under a discrete subgroup Z4 of the U(1) flavor symmetry.