Weak interactions ine++e−→μ++μ−

The effects of the first-order neutral weak current in the reaction $e^{+}+e^{-}\to {\mu }^{+}+{\mu }^{-}$ are briefly reviewed. It is shown that the study of the front-back asymmetry and the polarization of the outgoing muon can provide considerable information about the nature of the neutral current associated with electron and muon. The effects of second-order charged weak interactions in $e^{+}+e^{-}\to {\mu }^{+}+{\mu }^{-}$, which can simulate first-order neutral-weak-current effects, are calculated in the Georgi-Glashow model and are shown to be smaller by at least a factor $\alpha$, the fine-structure constant.