Resummed differential cross sections for top-quark pairs at the LHC

Pecjak, Benjamin D.; Scott, Darren J.; Wang, Xing; Yang, Li Lin

Abstract

We present state of the art resummation predictions for differential cross sections in top-quark pair production at the LHC. They are derived from a formalism which allows the simultaneous resummation of both soft and small-mass logarithms, which endanger the convergence of fixed-order perturbative series in the boosted regime, where the partonic center-of-mass energy is much larger than the mass to the top quark. We combine such a double resummation at next-to-next-to-leading logarithmic′ (NNLL′) accuracy with standard soft-gluon resummation at next-to-next-to-leading logarithmic accuracy and with next-to-leading-order calculations, so that our results are applicable throughout the whole phase space. We find that the resummation effects on the differential distributions are significant, bringing theoretical predictions into better agreement with experimental data compared to fixed-order calculations. Moreover, such effects are not well described by the next-to-next-to-leading-order approximation of the resummation formula, especially in the high-energy tails of the distributions, highlighting the importance of all-orders resummation in dedicated studies of boosted top production.

Citation

Pecjak, B. D., Scott, D. J., Wang, X., & Yang, L. L. (2016). Resummed differential cross sections for top-quark pairs at the LHC. Physical Review Letters, 116(20), Article 202001. https://doi.org/10.1103/physrevlett.116.202001

• Journal Article Type: Article
• Acceptance Date: Apr 26, 2016
• Online Publication Date: May 19, 2016
• Publication Date: May 19, 2016
• Deposit Date: May 25, 2016
• Publicly Available Date: Jun 21, 2016
• Journal: Physical Review Letters
• Print ISSN: 0031-9007
• Electronic ISSN: 1079-7114
• Publisher: American Physical Society
• Peer Reviewed: Peer Reviewed
• Volume: 116
• Issue: 20
• Article Number: 202001
• DOI: https://doi.org/10.1103/physrevlett.116.202001
• Public URL: https://durham-repository.worktribe.com/output/1403840