Does universality of lepton also mean that two lepton families have the same renormalized coupling if they interact with a particular particle?
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Wikipedia: “The coupling of leptons to all types of gauge boson are flavour-independent: The interaction between leptons and a gauge boson measures the same for each lepton.” [Note: Recent experiments are raising questions about this.]
Lepton universality does not apply to their Higgs couplings; if it did, they would have the same mass.
As ACuriousMind put it so well here, “Lepton universality means all leptons behave the same, except when they don't.”
G. Smith
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