Neutrino Mixing and CP Phase Correlations

A special form of the $3 \times 3$ Majorana neutrino mass matrix derivable from $μ- τ$ interchange symmetry accompanied by a generalized $CP$ transformation was obtained many years ago. It predicts $θ_{23} = π/4$ as well as $δ_{CP} = \pm π/2$, with $θ_{13} \neq 0$. 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.

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