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Durham University

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Publication details

Ahrens, Valentin, Ferroglia, Andrea, Neubert, Matthias, Pecjak, Ben D. & Yang, Li Lin (2011). Top-pair forward-backward asymmetry beyond next-to-leading order. Physical Review D: Particles, Fields, Gravitation and Cosmology 84(7): 074004.

Author(s) from Durham


We make use of recent results in effective theory and higher-order perturbative calculations to improve the theoretical predictions of the QCD contribution to the top-quark pair production forward-backward asymmetry at the Tevatron. In particular, we supplement the fixed-order next-to-leading order calculation with higher-order corrections from soft-gluon resummation at next-to next-to-leading order accuracy performed in two different kinematic schemes, which allows us to make improved predictions for the asymmetry in the pp¯ and tt¯ rest frames as a function of the rapidity and invariant mass of the tt¯ pair. Furthermore, we provide binned results which can be compared with the recent measurements of the forward-backward asymmetry in events with a large pair invariant mass or rapidity difference. Finally, we calculate at NLO+NNLL order the top-quark charge asymmetry at the LHC as a function of a lower rapidity cutoff for the top and antitop quarks.