Muons and tauons as KK modes?? Hello, everybody: I have (what I think is) a silly question. We all know that μ and τ particles are just as electrons, but with larger mass. Could it be that they are heavier Kaluza-Klein modes of the e in a higher dimensional theory, where the extra dimension is compactified? I know I'm talking without mentioning a specific model (I don't know any), but I wonder if it is plausible or if there is a physical/mathematical argument against such a thing. Thanks!