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Scale and isolation sensitivity of diphoton distributions at the LHC

Gehrmann, Thomas; Glover, Nigel; Huss, Alexander; Whitehead, James

Scale and isolation sensitivity of diphoton distributions at the LHC Thumbnail


Authors

Thomas Gehrmann

Alexander Huss

James Whitehead



Abstract

Precision measurements of diphoton distributions at the LHC display some tension with theory predictions, obtained at next-to-next-to-leading order (NNLO) in QCD. We revisit the theoretical uncertainties arising from the approximation of the experimental photon isolation by smooth-cone isolation, and from the choice of functional form for the renormalisation and factorisation scales. We find that the resulting variations are substantial overall, and enhanced in certain regions. We discuss the infrared sensitivity at the cone boundaries in cone-based isolation in related distributions. Finally, we compare predictions made with alternative choices of dynamical scale and isolation prescriptions to experimental data from ATLAS at 8 TeV, observing improved agreement. This contrasts with previous results, highlighting that scale choice and isolation prescription are potential sources of theoretical uncertainty that were previously underestimated.

Citation

Gehrmann, T., Glover, N., Huss, A., & Whitehead, J. (2021). Scale and isolation sensitivity of diphoton distributions at the LHC. Journal of High Energy Physics, 2021(1), Article 108. https://doi.org/10.1007/jhep01%282021%29108

Journal Article Type Article
Acceptance Date Nov 30, 2020
Online Publication Date Jan 19, 2021
Publication Date 2021-01
Deposit Date Mar 15, 2021
Publicly Available Date Mar 15, 2021
Journal Journal of High Energy Physics
Print ISSN 1126-6708
Electronic ISSN 1029-8479
Publisher Scuola Internazionale Superiore di Studi Avanzati (SISSA)
Peer Reviewed Peer Reviewed
Volume 2021
Issue 1
Article Number 108
DOI https://doi.org/10.1007/jhep01%282021%29108
Public URL https://durham-repository.worktribe.com/output/1245535

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Publisher Licence URL
http://creativecommons.org/licenses/by/4.0/

Copyright Statement
Open Access . This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.






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