| We present a measurement of forward-backward asymmetries in top-antitop quark pairs produced in proton-antiproton collisions decaying via the lepton+jets channel. Using data recorded by the DZero experiment at the Fermilab Tevatron collider and corresponding to an integrated luminosity of 5.4 inverse femtobarns, we measure the forward-backward asymmetry in top-antitop quark events to be (9.2 +/- 3.7)%, after background processes have been subtracted. After correcting for the effects of acceptance and detector reconstruction, we measure an asymmetry of (19.6 +/- 6.5)%. In addition, we measure an acceptance-corrected asymmetry based on the lepton from top-antitop quark decay of (15.2 +/- 4.0)%. We compare these results to predictions from the MC@NLO next-to-leading-order QCD simulation. |
