Electron-Muon and Electron-Hadron Production in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>e</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mrow><mml:msup><mml:mrow><mml:mi>e</mml:mi></mml:mrow><mml:mrow><mml:mo>−</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>Collisions

We observe anomalous $e\ensuremath{\mu}$ and $e$-hadron events in ${e}^{+}{e}^{\ensuremath{-}}$ collisions at SPEAR in an experiment that uses a lead-glass counter system to identify electrons. The anomalous events are observed in the two-charged-prong topology. Their properties are consistent with the production of a pair of heavy leptons in the reaction ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\tau}}^{+}{\ensuremath{\tau}}^{\ensuremath{-}}$ with subsequent decays of ${\ensuremath{\tau}}^{\ifmmode\pm\else\textpm\fi{}}$ into leptons and hadrons. Under the assumption that they come only from this source, we measure the branching ratios $B(\ensuremath{\tau}\ensuremath{\rightarrow}e{\ensuremath{\nu}}_{e}{\ensuremath{\nu}}_{\ensuremath{\tau}})=(22.4\ifmmode\pm\else\textpm\fi{}5.5)%$ and $B(\ensuremath{\tau}\ensuremath{\rightarrow}h+\mathrm{neutrals})=(45\ifmmode\pm\else\textpm\fi{}19)%$.