On the Fukugita-Tanimoto-Yanagida Ansatz with Partially Non-degenerate Right-handed Majorana Neutrinos

Midori Obara; Zhi-zhong Xing

doi:10.1016/j.physletb.2006.11.010

paper

On the Fukugita-Tanimoto-Yanagida Ansatz with Partially Non-degenerate Right-handed Majorana Neutrinos

arXiv:hep-ph/0608280 · doi:10.1016/j.physletb.2006.11.010

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) $M_{3} = M_{2} \neq = M_{1}$ , (B) $M_{2} = M_{1} \neq = M_{3}$ and (C) $M_{1} = M_{3} \neq = M_{2}$ , 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.

17 pages, 4 figures, references added, minor changes

On the Fukugita-Tanimoto-Yanagida Ansatz with Partially Non-degenerate Right-handed Majorana Neutrinos

Abstract

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