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S. and Warchol, J. and Watts, G. and Wayne, M. and Weber, M. and Welty-Rieger, L. and White, A. and Wicke, D. and Williams, M. R. J. and Wilson, G. W. and Wobisch, M. and Wood, D. R. and Wyatt, T. R. and Xie, Y. and Xu, C. and Yacoob, S. and Yamada, R. and Yang, W. -C. and Yasuda, T. and Yatsunenko, Y. A. and Ye, Z. and Yin, H. and Yip, K. and Youn, S. W. and Yu, J. and Zelitch, S. and Zhao, T. and Zhou, B. and Zhu, J. and Zielinski, M. and Zieminska, D. and Zivkovic, L. and , D0 Collaboration (2011) Forward-backward asymmetry in top quark-antiquark production. Physical Review D, 84 (11). -. ISSN 1550-7998
We present a measurement of forward-backward asymmetry in top quark-antiquark production in proton-antiproton collisions in the final state containing a lepton and at least four jets. Using a data set corresponding to an integrated luminosity of 5.4 fb(-1), collected by the D0 experiment at the Fermilab Tevatron Collider, we measure the t (t) over bar forward-backward asymmetry to be (9.2 +/- 3.7)% at the reconstruction level. When corrected for detector acceptance and resolution, the asymmetry is found to be (19.6 +/- 6.5)%. We also measure a corrected asymmetry based on the lepton from a top quark decay, found to be (15.2 +/- 4.0)%. The results are compared to predictions based on the next-to-leading-order QCD generator MC@NLO. The sensitivity of the measured and predicted asymmetries to the modeling of gluon radiation is discussed.
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