Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-08-04
Physics
High Energy Physics
High Energy Physics - Phenomenology
7 pages, 3 figures. Contribution to the workshop "30 years of strong interactions", Spa, Belgium, 6-8 April 2011
Scientific paper
Models for Majorana neutrino masses can be classified according to the level in perturbation theory at which the effective dimension five operator $LLHH$ is realized. The possibilities range from the tree-level up to the three-loop level realizations. We discuss some general aspects of this approach and speculate about a model independent classification of the possible cases. Among all the realizations, those in which the effective operator is induced by radiative corrections open the possibility for lepton number violation near -or at- the electroweak scale. We discuss some phenomenological aspects of two generic radiative realizations: the Babu-Zee model and supersymmetric models with bilinear R-parity violation.
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