Abstract
The hierarchy of lepton masses is studied in a dynamical model of family (horizontal) symmetry. Left-right symmetry for both vertical (electroweak) and horizontal gauge groups is favored. The decay μ→eγ puts a strong constraint on couplings as well as on the masses of both the horizontal gauge boson and the right handed Z boson.
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Fishbane, P.M., Hung, P.Q. Lepton masses in a dynamical model of family symmetry. Z. Phys. C - Particles and Fields 38, 649–652 (1988). https://doi.org/10.1007/BF01624371
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DOI: https://doi.org/10.1007/BF01624371