On the Deviation in Cobimaximal Neutrino Mixing emanating from Charged Lepton Sector

Аннотация

The recent global fits of neutrino oscillation data is pointing towards non-maximal value of atmospheric neutrino mixing angle (${\theta }_{23}$) and normal hierarchical neutrino masses at about 1.6$\sigma$ and 2.5$\sigma$ confidence level, respectively. The neutrino mixing matrix with cobimaximal (CBM) pattern is known to predict maximal value of ${\theta }_{23}$ (=${45}^o$) and Dirac CP phase ${\delta }_{\text{CP}}=\pm \pi /2$ while the solar (${\theta }_{12}$) and reactor (${\theta }_{13}$) mixing angles are arbitrary. In this work, we study a simple deviation from this mixing pattern in order to accommodate non-maximal values of ${\theta }_{23}$. Also, we have calculated the prediction for Jarlskog CP rephasing invariant $J_{\text{CP}}$, sensitive to CP violation measured in the neutrino oscillation experiments.