Limit on the top-quark mass from proton-antiproton collisions ats=1.8TeV

We present results of searches for the top quark in $p\overline{p}$ collisions at $\sqrt{s}=1.8\mathrm{}$ TeV. The data sample was collected during 1988-1989 at the Fermilab Tevatron Collider and has an integrated luminosity of 4.1 ${\mathrm{pb}}^{-1\mathrm{}}$. We have extended our previous search for $e\mu$ final states to include the $\mathrm{ee}$ and $\mu \mu$ channels. In addition, we have searched for a low-transverse-momentum muon as a tag of the bottom quark in top decay events with a lepton and at least two jets. We obtain a lower limit on the top-quark mass of 91 GeV/${\mathit{c}}^2$ at the 95% confidence level assuming standard-model charged-current decays.