Conditions on the Higgs-Yukawa couplings for lepton mass

Certain cubic conditions on the Higgs-Yukawa couplings for the three-generation masses of charged-leptons and neutrinos are reported here. Embodying an S3 symmetry, the associated mass values for e, μ, τ and the three neutrinos are in striking agreement (correspondence accuracy of O(10-6) for the e, μ, τ masses) with the experimental mass values, suggesting that the coupling theory features the conditions and the S3 symmetry