Generating nonzero ${\theta }_{13}$ without breaking the $2$-$3$ symmetry of neutrino mass matrix

Abstract

The prediction of vanishing reactor angle was thought to be a signature of $2$-$3$ symmetry of neutrino mass matrix. But the present study addresses certain interesting facts related with $2$-$3$ symmetry which are not addressed so far. The investigation highlights that ${\theta }_{13}=0$, corresponds to a very special case in association with $2$-$3$ symmetry and to engender a non-zero ${\theta }_{13}$, the breakdown of $2$-$3$ symmetry is not essential.