Radiative Neutrino Mass in Type III Seesaw Model

Details Radiative Neutrino Mass in Type III Seesaw Model Radiative Neutrino Mass in Type III Seesaw Model

2009-02-09

arxiv.org/abs/0902.1434v2

Phys.Rev.D79:073003,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

21 pages, 1 figure; v2: added 3 sentences in sec 4 for clarifications, version published on 7 Apr 2009 in PR D79, 073003 (2009

Scientific paper

10.1103/PhysRevD.79.073003

The simplest type III seesaw model as originally proposed introduces one lepton triplet. It thus contains four active neutrinos, two massive and two massless at tree level. We determine the radiative masses that the latter receive first at two loops. The masses are generally so tiny that they are definitely excluded by the oscillation data, if the heavy leptons are not very heavy, say, within the reach of LHC. To accommodate the data on masses, the seesaw scale must be as large as the scale of grand unification. This indicates that the most economical type III model would entail no new physics at low energies beyond the tiny neutrino masses.

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