Generalized μ–τ reflection symmetry and leptonic CP violation

We propose a generalized μ–τμ–τ reflection symmetry to constrain the lepton flavor mixing parameters. We obtain a new correlation between the atmospheric mixing angle θ23θ23 and the “Dirac” CP violation phase δCPδCP. Only in a specific limit our proposed CP transformation reduces to standard μ–τμ–τ reflection, for which θ23θ23 and δCPδCP are both maximal. The “Majorana” phases are predicted to lie at their CP-conserving values with important implications for the neutrinoless double beta decay rates. We also study the phenomenological implications of our scheme for present and future neutrino oscillation experiments including T2K, NOνA and DUNE.