Cornering the revamped BMV model with neutrino oscillation data

TL;DR

This paper assesses the viability of the revamped BMV neutrino model using current and future oscillation data, highlighting its constraints on the atmospheric angle and CP phase, and evaluating experimental prospects for testing it.

Contribution

It provides the first detailed analysis of the revamped BMV model's parameter space with current data and forecasts its testability with upcoming neutrino experiments.

Findings

Higher octant of $ heta_{23}$ is only allowed at 99% C.L.

The model predicts a strong correlation between $ heta_{23}$ and $\delta_{CP}$.

Future experiments like DUNE and T2HK can effectively test the model.

Abstract

Using the latest global determination of neutrino oscillation parameters from~\cite{deSalas:2017kay} we examine the status of the simplest revamped version of the BMV (Babu-Ma-Valle) model, proposed in~\cite{Morisi:2013qna}. The model predicts a striking correlation between the "poorly determined" atmospheric angle $\theta_{23}$ and CP phase $\delta_{CP}$, leading to either maximal CP violation or none, depending on the preferred $\theta_{23}$ octants. We determine the allowed BMV parameter regions and compare with the general three-neutrino oscillation scenario. We show that in the BMV model the higher octant is possible only at $99\%$ C.L., a stronger rejection than found in the general case. By performing quantitative simulations of forthcoming DUNE and T2HK experiments, using only the four "well-measured" oscillation parameters and the indication for normal mass ordering, we also map out the potential of these experiments to corner the model. The resulting global sensitivities are given in a robust form, that holds irrespective of the true values of the oscillation parameters.