Abstract
Taking three right-handed Majorana neutrino masses M i to be partially non-degenerate, we make a new analysis of the Fukugita–Tanimoto–Yanagida ansatz and confront it with current neutrino oscillation data. We determine the parameter space for cases (A) M 3 = M 2 ≠ M 1 , (B) M 2 = M 1 ≠ M 3 and (C) M 1 = M 3 ≠ M 2 , and examine their respective deviations from the original M 1 = M 2 = M 3 case. The numerical constraints on three light neutrino masses, three neutrino mixing angles and three CP-violating phases are also obtained, together with the predictions for the Jarlskog invariant of CP violation and the effective masses of the tritium beta decay and the neutrinoless double-beta decay.
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