Measurement of the tt̅ production cross section using dilepton events in pp̅ collisions

Abstract

We present a measurement of the tt^-production cross section σtt^-in collisions at √s=1.96TeVusing 5.4 fb^-1 of integrated luminosity collected with the D∅ detector. We consider final states with at least two jets and two leptons (ee, eμ, μμ), and events with one jet for the eμ final state as well. The measured cross section is#963;tt^-=7.36^+0.90_-0.79(stat+syst) pb. This result combined with the cross section measurement in the lepton + jets final state yields σ_tt^-=7.56^+0.63_-0.56(stat+syst) pb, which agrees with the standard model expectation. The relative precision of 8% of this measurement is comparable to the precision of the latest theoretical calculations.