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.