Phys. Rev. Lett. 81, 1171–1174 (1998)Pathways to Naturally Small Neutrino MassesReceived 11 May 1998; published in the issue dated 10 August 1998 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. © 1998 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.81.1171
DOI:
10.1103/PhysRevLett.81.1171
PACS:
14.60.Pq, 12.10.Kt
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