Spontaneous CP violation in A4xSU(5) with Constrained Sequential Dominance 2

TL;DR

This paper develops a renormalizable A4xSU(5) model with spontaneous CP violation and CSD2, successfully fitting quark and lepton data and predicting a large leptonic CP phase and specific mixing angles.

Contribution

It constructs a unified A4xSU(5) model incorporating CSD2 and spontaneous CP violation, providing new insights into neutrino mixing and CP phases.

Findings

Predicts a reactor angle consistent with Daya Bay and RENO

Forecasts a Dirac CP phase around 130 degrees

Achieves a good fit to quark and lepton masses and mixings

Abstract

We revisit a two right-handed neutrino model with two texture zeros, namely an indirect model based on A4 with the recently proposed new type of constrained sequential dominance (CSD2), involving vacuum alignments along the (0,1,-1)^T and (1,0,2)^T directions in flavour space, which are proportional to the neutrino Dirac mass matrix columns. In this paper we construct a renormalizable and unified indirect A4xSU(5) model along these lines and show that, with spontaneous CP violation and a suitable vacuum alignment of the phases, the charged lepton corrections lead to a reactor angle in good agreement with results from Daya Bay and RENO. The model predicts a right-angled unitarity triangle in the quark sector and a Dirac CP violating oscillation phase in the lepton sector of delta approximately 130 degrees, while providing a good fit to all quark and lepton masses and mixing angles.