Elimination of Charmed Mesons as Source of Anomalous Lepton Events ine+e−Annihilations

An analysis of the Maryland-Pavia-Princeton experiment on inclusive muon production in $e^{-}{e}^{+}$ annihilations yields an upper limit for the ratio of charged-multiplicity events from the particle $U$, charge conjugate to the particle $\overline{U}$ that produced the muon, of $\frac{[U\to (n_{\mathrm{ch}}>~3\left)\right]}{[U\to (n_{\mathrm{ch}}=1\left)\right]}<0.33\mathrm{}$. If $U$ were a charmed meson, this ratio would be >2, a prediction incompatible with the data. The predicted ratio for $U$ a heavy lepton is ∼0.18, in good agreement with experiment.