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Top-pair forward-backward asymmetry beyond next-to-leading order.

Ahrens, Valentin; Ferroglia, Andrea; Neubert, Matthias; Pecjak, Ben D.; Yang, Li Lin

Authors

Valentin Ahrens

Andrea Ferroglia

Matthias Neubert

Li Lin Yang



Abstract

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.

Citation

Ahrens, V., Ferroglia, A., Neubert, M., Pecjak, B. D., & Yang, L. L. (2011). Top-pair forward-backward asymmetry beyond next-to-leading order. Physical Review D, 84(7), Article 074004. https://doi.org/10.1103/physrevd.84.074004

Journal Article Type Article
Publication Date 2011-10
Deposit Date Nov 20, 2012
Journal Physical Review D - Particles, Fields, Gravitation and Cosmology
Print ISSN 1550-7998
Electronic ISSN 1550-2368
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 84
Issue 7
Article Number 074004
DOI https://doi.org/10.1103/physrevd.84.074004
Public URL https://durham-repository.worktribe.com/output/1493424