μeproduction ine+e−annihilation

We calculate the observed cross section, the horizontal-vertical asymmetry, the angular-distribution parameter $\alpha$ ($\frac{d\sigma }{dcos\theta }\propto 1+\alpha {cos}^2\theta$), and the distribution of the decay-lepton momentum over a wide range of energy under the hypothesis that heavy leptons are produced in $e^{+}{e}^{-}$ annihilation. The heavy-lepton decay coupling is assumed to be vector and axial-vector in character. The use of the narrow-width approximation allows the distributions of interest to be expressed analytically as functions of $s$.