Measurement of the top quark pair production cross section in pp̅ collisions using multijet final states

Abstract

We have studied tt̅ production using multijet final states in pp̅ collisions at a center-of-mass energy of 1.8 TeV, with an integrated luminosity of 110.3 pb^-1. Each of the top quarks with these final states decays exclusively to a bottom quark and a W boson, with the W bosons decaying into quark-antiquark pairs. The analysis has been optimized using neural networks to achieve the smallest expected fractional uncertainty on the tt̅ production cross section, and yields a cross section of 7.1±2.8(stat)±1.5 (syst) pb, assuming a top quark mass of 172.1 GeV/c². Combining this result with previous D∅ measurements, where one or both of the W bosons decay leptonically, gives a tt̅ production cross section of 5.9±1.2(stat)±1.1 (syst)pb.