We have observed 1522 neutrino events with a μ^- secondary and 8 events with a μ⁺ secondary from a beam consisting mostly of neutrinos. The μ⁺ events are consistent in number and kinematic properties with beam contamination by ν_μ. This experiment sees no evidence for production of heavy positively charged leptons. Assuming a coupling constant equal to the universal Fermi constant and a branching ratio to muons $B=0.3$, our 90% confidence lower limit corresponds to M_Y⁺8.4 GeV/c².
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Barish et al. (1974) studied this question.
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