Abstract:

The CDF and D0 experiments have recently reported new measurements of the forward-backward asymmetry in top quark pair production inThe CDF and D0 experiments have recently reported new measurements of the forward-backward asymmetry in top quark pair production in ppbar collisions at the Fermilab Tevatron. In the CDF measurements presented here, significant inclusive asymmetries are observed in a 5 fb-1 sample in both the lepton+jets and the dilepton decay modes of the ttbar pair, with a combined AFB = 0.20 ± 0.07, compared to an NLO QCD prediction of 0.07. In the lepton+ jets mode the asymmetry is found to be consistent with conservation under interchange of t and tbar, and most significant at large ttbar rapidity difference and invariant mass. I will discuss the significance of these measurements in the context of top physics and recent theoretical model-building.