We report on a measurement of the mass dependence of the forward-backward charge asymmetry, $A_{\mathrm{FB}}$, and production cross section $d\sigma /dM$ for $e^{+}{e}^{-}$ pairs with mass $M_{\mathrm{ee}}>40\mathrm{}\mathrm{GeV}{/c}^2$. The data sample consists of $108{\mathrm{pb}}^{-1\mathrm{}}$ of $p\overline{p}$ collisions at $\sqrt{s}=1.8\mathrm{TeV}$ taken by the Collider Detector at Fermilab during 1992–1995. The measured asymmetry and $d\sigma /dM$ are compared with the predictions of the standard model and a model with an extra $Z^{\prime }$ gauge boson.

• Received 11 June 2001

DOI:https://doi.org/10.1103/PhysRevLett.87.131802