Survival of three-fold quasi-degenerate neutrino mass models with CP odd parity

Abstract

Quasi-degenerate Majorana neutrino mass model with CP-parity pattern (m1,−m2,m3) in the mass eigenvalues, exhibits a strong variation of the absolute neutrino masses with solar mixing angle. Numerical analysis shows that the range of solar angle tan2θ12=(0.50−0.45) corresponds to the range of the absolute neutrino mass scale m3=(0.4−0.1)eV. Considering the lower values, the model is far from discrimination from the bounds on absolute neutrino masses from 0νββ decay and cosmology.