Inverted neutrino mass hierarchy and mixing in the Zee-Babu model

TL;DR

This paper demonstrates that the Zee-Babu model can successfully fit recent neutrino oscillation data with an inverted hierarchy, predicting no CP violation and consistent neutrinoless double beta decay parameters.

Contribution

It shows the Zee-Babu model's capability to accommodate recent neutrino data with specific phase predictions and no CP violation at two-loop level.

Findings

Majorana phases are zero

Dirac phase is 0 or π, indicating no CP violation

Predicted neutrinoless double beta decay parameters are consistent with recent data

Abstract

We show that the neutrino mass matrix of the Zee-Babu model is able to fit the recent data on neutrino masses and mixing with non-zero $\theta_{13}$ in the inverted neutrino mass hierarchy. The results show that the Majorana phases are equal to zero and the Dirac phase ($\de$) is predicted to either $0$ or $\pi$, i. e, there is no CP violation in the Zee-Babu model at the two loop level. The effective mass governing neutrinoless double beta decay and the sum of neutrino masses are consistent with the recent analysis.