期刊
JOURNAL OF HIGH ENERGY PHYSICS
卷 -, 期 6, 页码 -出版社
SPRINGER
DOI: 10.1007/JHEP06(2011)037
关键词
Neutrino Physics; Global Symmetries; Rare Decays
资金
- CICYT [FPA2009-09017]
- project HEPHACOS [P-ESP-00346]
- MICINN [BES-2010-037869]
- German Excellence Initiative
- German 'Bundesministerium fur Bildung und Forschung' [05H09WOE]
We analyze the most natural formulations of the minimal lepton flavour violation hypothesis compatible with a type-I seesaw structure with three heavy singlet neutrinos N, and satisfying the requirement of being predictive, in the sense that all LFV effects can be expressed in terms of low energy observables. We find a new interesting realization based on the flavour group SU(3)(e) x SU(3)(l+N) (being e and l respectively the SU(2) singlet and doublet leptons). An intriguing feature of this realization is that, in the normal hierarchy scenario for neutrino masses, it allows for sizeable enhancements of mu -> e transitions with respect to LFV processes involving the tau lepton. We also discuss how the symmetries of the type-I seesaw allow for a strong suppression of the N mass scale with respect to the scale of lepton number breaking, without implying a similar suppression for possible mechanisms of N production.
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