Cornering the revamped BMV model with neutrino oscillation data

Abstract

Using the latest global determination of neutrino oscillation parameters from [1] we examine the status of the simplest revamped version of the BMV (Babu–Ma–Valle) model, proposed in [2]. The model predicts a striking correlation between the “poorly determined” atmospheric angle θ23 and CP phase δCP, leading to either maximal CP violation or none, depending on the preferred θ23 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.