Abstract
We describe in detail some of the patterns of leptonic mass matrices which lead to a correct spectrum for the neutrino and charged lepton masses, as well as, to a leptonic mixing in agreement with present data on neutrino oscillations. We consider both cases of quasi-degenerate and of hierchical neutrino masses. We point out some of the subtilities which arise in the case of quasi-degenerate Majorana neutrinos, where mixing is meaningful even in the exact degenerate limit. In the framework of hierchical neutrino masses, we describe the hypothesis of universal breaking of extended democracy, where large mixing in the leptonic sector naturally arises as a result of the seesaw mechanism.
This work was done in collaboration with M.N.Rebelo, and with E.Kh. Akhmedov and F.R. Joaquim
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Branco, G.C., Silva-Marcos, J.I. (2001). Patterns for the Neutrino Mass Matrices and Mixings. In: Branco, G.C., Shafi, Q., Silva-Marcos, J.I. (eds) Recent Developments in Particle Physics and Cosmology. NATO Science Series, vol 34. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-0676-7_3
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