Phenomenological analysis of an SO(10) model for lepton-mixing angles and Majorana neutrino masses

An SO(10) model for the lepton sector, with constraints imposed by the Fritzsch ansatz, is discussed. It is found that ${\nu }_e$ is much lighter than ${\nu }_{\mu }$ and ${\nu }_{\tau }$, which are almost degenerate in mass with substantial mixing between them. A small ${\nu }_e$-${\nu }_{\mu }$ mixing angle theta≃4° is predicted. CP-violation effects in the leptonic sector are found to be negligible.