ABACHI, S (reprint author), FERMILAB NATL ACCELERATOR LAB,POB 500,BATAVIA,IL 60510, USA.
We present results on the search for the top quark in p ($) over bar p collisions at root s = 1.8 TeV with an integrated luminosity of 13.5 +/- 1.6 pb(-1). We have considered t ($) over bar t production in the standard model using electron and muon dilepton decay channels (t ($) over bar t --> e mu + jets, ee + jets, and mu mu + jets) and single-lepton decay channels (t ($) over bar t --> e + jets and mu + jets) with and without tagging of b quark jets. An analysis of these data optimized for top quark masses below 140 GeV/c(2) gives a lower top quark mass limit of 128 GeV/c(2). An analysis optimized for higher top quark masses yields a events with an expected background of 3.8 +/- 0.9. If we assume that the excess is due to t ($) over bar t production, and assuming a top mass of 180 GeV/c(2), we obtain a cross section of 8.2 +/- 5.1 pb.