We explain neutrino-produced trimuon events with a gauge model incorporating heavy leptons M^- and M⁰ with the cascade-decay chain M^-→M⁰μ^-ν and M⁰→μ^-μ⁺ν. Comparisons with trimuon data are made for M^- and M⁰ masses 7 and 3.5 GeV, respectively. This mechanism predicts same-sign dimuons at five times the trimuon rate.
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Barger et al. (1977) studied this question.
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