Low-energy phenomena of the lepton sector in an A4 symmetry model with heavy inverse seesaw neutrinos

Abstract An extension of the two Higgs doublet model including inverse seesaw neutrinos and neutral Higgs bosons was constructed based on the A4 symmetry in order to explain the recent neutrino oscillation data. This model can distinguish two well-known normal and inverted order schemes of neutrino data once both the effective masses mβ in tritium beta decays and 〈m〉 in the neutrinoless double beta decay are observed. The lepton flavor violating decays of the charged leptons eb → eaγ, μ → 3e, the Standard Model-like Higgs boson decays h → ebea, and the μ–e conversions in some nuclei are generated from loop corrections. The experimental data on the branching ratio Br(μ → eγ, 3e) predict that the upper bounds of Br(τ → μγ, eγ) and Br(h → eaeb) are much smaller than the planned experimental sensitivities. In contrast, the μ–e conversions are promising signals for experiments.