An electroweak gauge model is discussed, where generations are associated with separate gauge groups with different couplings. The observed μ-e universality is the result of a mass-scale inequality, ν₀₃ν₁₂, in much the same way as strong isospin is the result of mᵤ, md1 GeV. However, in contrast to the standard model, it is now possible to have (1) a longer τ lifetime, (2) an observable B⁰-B̄⁰ mixing, and (3) many gauge bosons Wᵢ,Zᵢ in place of W,Z with M_Wᵢ>MW and M_Zᵢ>MZ.
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Li et al. (1981) studied this question.
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