Search for high mass top quark production in {ital p{bar p}} collisions at {radical}{ital s}=1.8 TeV

We present new results on the search for the top quark in {ital p{bar p}} collisions at {radical}{ital s}=1.8 TeV with an integrated luminosity of 13.5{plus_minus}1.6 pb{sup --1}. We have considered {ital t{bar t}} production in the standard model using electron and muon dilepton decay channels ({ital t{bar t}}{r_arrow}{ital e}{mu}+ jets, {ital ee}+ jets, and {mu}{mu}+ jets) and single-lepton decay channels ({ital t{bar t}}{r_arrow}{ital e}+ jets and {mu}+ jets) with and without tagging of {ital b} quark jets. From all channels we have nine events with an expected background of 3.8{plus_minus}0.9. If we assume that the excess is due to {ital t{bar t}} production, and assume a top mass of 180 GeV/{ital c}{sup 2}, we obtain a cross section of 8.2{plus_minus}5.1 pb.