Heavy-lepton production ine−e+annihilation

In order to test the ansatz that heavy-lepton pairs mediate the production of final states in $e^{-}{e}^{+}$ annihilation with signature $e^{-}{\mu }^{+}$, we determine analytically the differential cross section for the process $e^{-}+e^{+}\to L^{-}+L^{+}\to \left(e^{-}{\overline{\nu }}_e{\nu }_L\right)+\left({\mu }^{+}{\nu }_{\mu }{\overline{\nu }}_L\right)$. We investigate both $V-A$ and $V+A$ heavy-lepton currents with the inclusion of the heavy-lepton spin correlation and compare them with the SLAC data.