Measurement of the $t\bar{t} production cross section in $p\bar{p}$ collisions at $\sqrt{s}$ = 1.8 TeV

Abstract

We update the measurement of the top production cross section using the CDF detector at the Fermilab Tevatron. This measurement uses $t\bar{t}$ decays to the final states $e+ν$+jets and $μ+ν$+jets. We search for $b$ quarks from $t$ decays via secondary-vertex identification or the identification of semileptonic decays of the $b$ and cascade $c$ quarks. The background to the $t\bar{t}$ production is determined primarily through a Monte Carlo simulation. However, we calibrate the simulation and evaluate its uncertainty using several independent data samples. For a top mass of 175 $GeV/c^2$, we measure $σ_{t\bar{t}}=5.1 \pm 1.5$ pb and $σ_{t\bar{t}}=9.2 \pm 4.3$ pb using the secondary vertex and the lepton tagging algorithms, respectively. Finally, we combine these results with those from other $t\bar{t}$ decay channels and obtain $σ_{t\bar{t}} = 6.5^{+1.7}_{-1.4}$ pb.