Patterns for the Neutrino Mass Matrices and Mixings

  • G. C. Branco
  • J. I. Silva-Marcos
Part of the NATO Science Series book series (NAII, volume 34)


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.


Neutrino Mass Charged Lepton Solar Neutrino Majorana Neutrino Neutrino Mass Matrix 
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Copyright information

© Springer Science+Business Media Dordrecht 2001

Authors and Affiliations

  • G. C. Branco
    • 1
  • J. I. Silva-Marcos
    • 1
  1. 1.Departamento de Física, Instituto Superior TécnicoCentro de Física das Interacções Fundamentais(CFIF)LisboaPortugal

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