Pathways to Naturally Small Neutrino Masses

Details Pathways to Naturally Small Neutrino Masses Pathways to Naturally Small Neutrino Masses

1998-05-04

arxiv.org/abs/hep-ph/9805219v4

Phys.Rev.Lett.81:1171-1174,1998

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages including 5 figures; corrected minus signs in Eqs.(5)-(6), no result is affected

Scientific paper

10.1103/PhysRevLett.81.1171

In the minimal standard electroweak gauge model, there is an effective dimension-five operator which generates neutrino masses, and it has only three tree-level realizations. One is the canonical seesaw mechanism with a right-handed neutrino. Another is having a heavy Higgs triplet as recently proposed. The third is to have a heavy Majorana fermion triplet, an example of which is presented here in the context of supersymmetric SU(5) grand unification. The three generic one-loop realizations of this operator are also discussed.

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