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Early measurements of a large forward-background asymmetry at the CDF and D0 experiments at Fermilab have generated much recent interest, but were hampered by large uncertainties. We present here a new measurement of the parton level forward-backward asymmetry of pair-produced top quarks, using a high-statistics sample with much improved precision. We study the rapidity, y{sub top}, of the top quark production angle with respect to the incoming parton momentum in both the lab and t{bar t} rest frames. We find the parton-level forward-backward asymmetries to be A{sub fb}{sup p{bar p}} = 0.150 {+-} 0.050{sup stat} {+-} 0.024{sup syst} A{sub fb}{sup t{bar t}} = 0.158 {+-} 0.072{sup stat} {+-} 0.024{sup syst}. These results should be compared with the small p{bar p} frame charge asymmetry expected in QCD at NLO, A{sub fb} = 0.050 {+-} 0.015. Additionally, we introduce a measurement of the A{sub fb} rapidity dependence dA{sub fb}/d({Delta}y). We find this to be A{sub fb}{sup t{bar t}}(|{Delta}y| 1.0) = 0.611 {+-} 0.210{sup stat} {+-} 0.246{sup syst} which we compare with model predictions 0.039 {+-} 0.006 and 0.123 {+-} 0.018 for the inner and outer rapidities, respectively.

Measurement of the inclusive forward-backward t$\bar{t}$ production asymmetry and its rapidity dependence dA<sub>fb</sub>/d(Δy)