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


Ahrens, V; Ferroglia, A; Neubert, M; Pecjak, B; Yang, L (2011). Top-pair forward-backward asymmetry beyond next-to-leading order. Physical Review D, 84(7):074004.

Abstract

We make use of recent results in effective theory and higher-order perturbative calculations to im- prove 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 NLO calculation with higher-order corrections from soft gluon resummation at NNLL accuracy performed in two dif- ferent 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 cut-off for the top and antitop quarks.

Abstract

We make use of recent results in effective theory and higher-order perturbative calculations to im- prove 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 NLO calculation with higher-order corrections from soft gluon resummation at NNLL accuracy performed in two dif- ferent 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 cut-off for the top and antitop quarks.

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Additional indexing

Other titles:The top-pair forward-backward asymmetry beyond NLO
Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute for Computational Science
Dewey Decimal Classification:530 Physics
Language:English
Date:October 2011
Deposited On:19 Feb 2012 09:46
Last Modified:10 Dec 2017 06:25
Publisher:American Physical Society
ISSN:1550-7998 (P) 1089-4918 (E)
Publisher DOI:https://doi.org/10.1103/PhysRevD.84.074004
Related URLs:http://arxiv.org/abs/1106.6051

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