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A multiplicative selection rule for mu meson-electron transitions is proposed. A = -1 is considered for the muon and its neutnino, while the for all other particles is +1. The selection mile then states that (-1) exp STAno. of initial (-1) parity particles! = (-1) exp STAno. of final (-1) parity particles!. Several reactions that are forbidden by an additive law but allowed by the multiplicative law are suggested; these reactions include mu + -- s+ + nu /sub mu / + nu /sub e/, e/sup -/ + e- -- mu - + mu - , and muonium -- antimu onium ( mu /sup +/e -- mu /sup -/e/sup +/). An intermediate-boson hypothesis is suggested. (T.F.H.)
Feinberg et al. (Sat,) studied this question.