Measurement Of The Tbart Production Cross Section Using Dilepton Events In Pbarp Collisions

We present a measurement of the t{bar t} production cross section [sigma]{sub t{bar t}} in p{bar p} collisions at √s = 1.96 TeV using 5.4 fb−1 of integrated luminosity collected with the D0 detector. We consider final states with at least two jets and two leptons (ee, e[mu], [mu][mu]), and events with one jet for the the e[mu] final state as well. The measured cross section is [sigma]{sub t{bar t}} = 7.36{sub -0.79}{sup +0.90} (stat + syst) pb. This result combined with the cross section measurement in the lepton + jets final state yields [sigma]{sub t{bar t}} = 7.56{sub -0.56}{sup +0.63}(stat + syst) pb, which agrees with the standard model expectation. The relative precision of 8% of this measurement is comparable to the latest theoretical calculations.