We measure the forward-backward asymmetry of the top quark--antiquark pair events (\(\afbtt\)) in the dilepton final state with the full
CDF run II data, corresponding to an integrated luminosity of \(9.1~\fbm\). The inclusive \(\afbtt\) is \(\afbtt = 0.12 \pm 0.11 (\stat) \pm 0.07 (\syst) = 0.12 \pm 0.13\).
This result is consistent with the NNLO standard model expectation of \(\afbtt = 0.095 \pm 0.007\) and the CDF measurement in the lepton + jets
final state of \(\afbtt = 0.164 \pm 0.047\). We also measure the \(\afbtt\) as a function of the rapidity difference of the top pairs (\(\dy\)).
The results are \(\afbtt(|\dy|<0.5)=0.12\pm0.33(\stat)\pm0.20(\syst) = 0.12\pm0.39\) and \(\afbtt(|\dy|>0.5)=0.13\pm0.13(\stat)\pm0.11(\syst)=0.13\pm0.17\),
which can be compared to the predictions from the Powheg Monte Carlo at 0.017 and 0.081, respectively.
The slope of the \(\afbtt\) vs. \(|\dy|\) is estimated to be \(\alpha=0.14\pm0.15\), consistent with the NNLO SM prediction.
Top reconstruction performance derived from Powheg MC