Rates for the production of lepton pairs via the reactions $e^{+}{e}^{-}\to \tilde{Z}\tilde{\gamma }$, $\tilde{Z}\to \tilde{\gamma }{l}^{+}{l}^{-}$ ($l=e or \mu$) are calculated. Cuts are made in the energies and angles of the produced leptons to eliminate the $\tau$ background. The possible background from production of a new heavy lepton is also calculated.

• Received 20 October 1983

DOI:https://doi.org/10.1103/PhysRevD.29.1317