W0effects in electron-positron collisions on1−resonances

Cross sections are given for $e^{-}{e}^{+}$ collisions on $1^{-}$ resonances producing pairs of spin-½ particles in the tree approximation. Effects of neutral currents and beam polarization are included. Possibilities for measuring $W^0$ effects in collisions producing ${\mu }^{-}{\mu }^{+}$, ${\tau }^{-}{\tau }^{+}$ and $e^{-}{e}^{+}$ at the $\Upsilon$ and higher-mass resonances are discussed.