Nonzero theta(13) for neutrino mixing in the context of A(4) symmetry

TL;DR

This paper explores how the A(4) symmetry model, originally used for tribimaximal neutrino mixing, can be adapted to accommodate a nonzero theta(13) in light of recent T2K experimental results.

Contribution

The paper provides a detailed analysis of extending the A(4) symmetry framework to incorporate a nonzero theta(13) neutrino mixing angle.

Findings

A(4) symmetry can be modified to produce nonzero theta(13)

Compatibility with T2K results demonstrated

Potential implications for neutrino mass hierarchy

Abstract

In the original 2004 paper which first derived tribimaximal mixing in the context of A(4), i.e. the non-Abelian finite symmetry group of the tetrahedron (Plato's fire), as its simplest application, it was also pointed out how theta(13) nonzero may be accommodated. On the strength of the new T2K result that 0.03 (0.04) < sin^2 2 theta(13) < 0.28 (0.34) for delta(CP)=0 and normal (inverted) neutrino mass hierarchy, we perform a more detailed analysis of how this original idea may be realized in the context of A(4).