Abstract
An extension of the Zee model involving a light right handed neutrino, ν R is considered. We update constraints on couplings between the bilepton scalar, the active neutrinos, ν R and the charged leptons. We find that the most stringent constraint currently comes from measurements limiting the width of the decay μ→e γ . These are used to predict the upper bound on violation of lepton universality in W boson decays.
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