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

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

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Authors

Darren J. Scott

Xing Wang

Li Lin Yang



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 Mar 28, 2024
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

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Copyright Statement
Reprinted with permission from the American Physical Society: Physical Review Letters 116, 202001 © (2016) by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modified, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.





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