Radiative Neutrino Mass in Type III Seesaw Model

Abstract

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.

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

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• Extending two Higgs doublet models for two-loop neutrino mass generation and one-loop neutrinoless double beta decay
• Lepton FCNC in Type III Seesaw Model
• A Higgs Quadruplet for Type III Seesaw and Implications for $\mu \to e\gamma$ and $\mu -e$ Conversion
• Neutrino phenomenology, W mass anomaly & muon $(g-2)$ in minimal type-III seesaw using $T^{\prime }$ modular symmetry
• Type III seesaw under $A_4$ modular symmetry with leptogenesis
• Recent Neutrino Data and Type III Seesaw with Discrete Symmetry
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