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

Pecjak, Benjamin D. and Scott, Darren J. and Wang, Xing and Yang, Li Lin (2016) 'Resummed differential cross sections for top-quark pairs at the LHC.', Physical review letters., 116 (20). p. 202001.


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.

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Publisher 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.
Date accepted:26 April 2016
Date deposited:21 June 2016
Date of first online publication:19 May 2016
Date first made open access:21 June 2016

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