Lower limit on the top-quark mass from events with two leptons inpp¯collisions at √s=1.8 TeV

We present results from searches for the top quark pp{} collisions at the Fermilab Tevatron Collider. The data sample was collected during 1988--89 with the Collider Detector at Fermilab and has an integrated luminosity of 4.1 pb^-1. Our previous search for e{μ} final states for tt{}{→}e{ν}b {μ}{ν}b{} decays has been extended to include the ee and {μ}{μ} channels. In addition, we have searched in each event with a high-transverse-momentum lepton accompanied by hadron jets for a low-transverse-momentum muon as a tag of a bottom quark in tt{}{→}l{ν}bqq{}b{} decays. A lower limit on the top-quark mass of 91 GeV/c² is obtained at the 95% confidence level, assuming standard model decays.