Measurement of tt̅ production in the t+jets topology using pp̅ collisions at √s=1.96 TeV

Abstract

We present a measurement of the tt̅ production cross section multiplied by the branching ratio to tau lepton decaying semihadronically (t_h) plus jets, σ(pp̅→tt̅+X).BR(tt̅ →t_h+jets), at a center of mass energy √s=1.96 TeV using 1fb^-1 of integrated luminosity collected with the D0 detector. Assuming a top quark mass of 170 GeV, we measure σtt̅.BR_th+j=0.60_-0.22^+0.23(stat)_-0.14^+0.15(syst)±0.04(lumi)pb. In addition, we extract the tt̅ production cross section using the tt̅→ t_h+jets topology, with the result σ_tt̅=6.9_-1.2^+1.2(stat)_-0.7^+0.8(syst)±0.4(lumi)pb. These findings are in good agreement with standard model predictions and measurements performed using other top quark decay channels.