Neutrino mixing and CP phase correlations

Abstract

A special form of the 3×3 Majorana neutrino mass matrix derivable from μ–τ interchange symmetry accompanied by a generalized CP transformation was obtained many years ago. It predicts θ23=π/4 as well as δCP=±π/2, with θ13≠0. Whereas this is consistent with present data, we explore a deviation of this result which occurs naturally in a recent proposed model of radiative inverse seesaw neutrino mass.