CP-phase effects on the effective neutrino mass $m_{ee}$ in the case of quasi-degenerate neutrinos

J. Maalampi, J. Riittinen

We study the possibility that the three mass states of the ordinary active neutrinos actually split into pairs of quasi-degenerate states, with $\Delta m_{k{k}^{\prime }}^2\sim 10^{-12}$ eV${}^2$ or…