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Top-quark pair production at high invariant mass: an NNLO soft plus virtual approximation

Ferroglia, Andrea; Pecjak, Ben D.; Yang, Li Lin

Authors

Andrea Ferroglia

Li Lin Yang



Abstract

e obtain a soft plus virtual approximation to the NNLO QCD contributions to the top-pair invariant mass distribution at hadron colliders. It is valid up to corrections of order m2t/M2mt2/M2, with M the pair invariant mass. This is currently the most complete QCD calculation for a differential cross section in top-quark pair production, and is useful for describing the high invariant mass region characteristic of boosted top quarks. We use our results to construct an improved NNLO approximation for the pair invariant mass distribution and compare it with previous, less complete approximations based on logarithmic terms from NNLL soft-gluon resummation alone. We find that the new NNLO approximation produces moderate enhancements of the differential cross section compared to previous ones, the effect being slightly more important at low values of invariant mass than at high ones. On the other hand, at high values of invariant mass the new NNLO corrections are dominated by even higher-order effects included in NNLL soft-gluon resummation, reaffirming the need for resummation in describing the highly boosted regime.

Citation

Ferroglia, A., Pecjak, B. D., & Yang, L. L. (2013). Top-quark pair production at high invariant mass: an NNLO soft plus virtual approximation. Journal of High Energy Physics, 2013(9), Article 032. https://doi.org/10.1007/jhep09%282013%29032

Journal Article Type Article
Acceptance Date Aug 7, 2013
Online Publication Date Sep 6, 2013
Publication Date Sep 6, 2013
Deposit Date Dec 9, 2015
Publicly Available Date Apr 22, 2016
Journal Journal of High Energy Physics
Print ISSN 1126-6708
Publisher Scuola Internazionale Superiore di Studi Avanzati (SISSA)
Peer Reviewed Peer Reviewed
Volume 2013
Issue 9
Article Number 032
DOI https://doi.org/10.1007/jhep09%282013%29032
Related Public URLs http://arxiv.org/abs/1306.1537

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