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arxiv: hep-ph/9805219 · v4 · submitted 1998-05-04 · ✦ hep-ph

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Pathways to Naturally Small Neutrino Masses

Ernest Ma (UC Riverside)
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classification ✦ hep-ph
keywords neutrinoheavymassesoperatorrealizationsthreetripletanother
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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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