The Importance of Being Majorana: Neutrinos versus Charged Fermions in Flavor Models

Details The Importance of Being Majorana: Neutrinos versus Charged Fermions in Flavor Models The Importance of Being Majorana: Neutrinos versus Charged Fermions in Flavor Models

2004-04-14

arxiv.org/abs/hep-ph/0404113v1

JHEP0411:055,2004

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, revtex4

Scientific paper

10.1088/1126-6708/2004/11/055

We argue that neutrino flavor parameters may exhibit features that are very different from those of quarks and charged leptons. Specifically, within the Froggatt-Nielsen (FN) framework, charged fermion parameters depend on the ratio between two scales, while for neutrinos a third scale--that of lepton number breaking--is involved. Consequently, the selection rules for neutrinos may be different. In particular, if the scale of lepton number breaking is similar to the scale of horizontal symmetry breaking, neutrinos may become flavor-blind even if they carry different horizontal charges. This provides an attractive mechanism for neutrino flavor anarchy.

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