Neutrino Mixing With Non-Zero $\theta_{13}$ In Zee-Babu Model

TL;DR

This paper derives an exact neutrino mass matrix solution in the Zee-Babu model, showing how non-zero θ13 and CP violation can arise, and identifies parameter regions consistent with experimental data.

Contribution

It provides an exact analytical solution for the neutrino mass matrix in the Zee-Babu model and explores conditions leading to realistic mixing angles and mass hierarchy.

Findings

Non-zero θ13 generated with nearly equal Yukawa couplings

Normal mass hierarchy preferred under tribimaximal mixing conditions

Parameter regions consistent with recent experimental neutrino data

Abstract

The exact solution for the neutrino mass matrix of the Zee-Babu model is derived. Tribimaximal mixing imposes conditions on the Yukawa couplings, from which the normal mass hierarchy is preferred. The derived conditions give a possibility of Majorana maximal $\mathrm{CP}$ violation in the neutrino sector. We have shown that non-zero $\theta_{13}$ is generated if Yukawa couplings between leptons almost equal to each other. The model gives some regions of the parameters where neutrino mixing angles and the normal neutrino mass hierarchy obtained consistent with the recent experimental data.