The ATLAS collaboration (Including: Becker, K., Facini, Gabriel, Harrison, P. F., Jones, E., Martin, T. A., Morgenstern, S., Murray, W. J., Roberts, B. A., Spangenberg, Martin and Vladimirov, V. E.). (2021) Measurement of the production cross section of pairs of isolated photons in pp collisions at 13 TeV with the ATLAS detector. Journal of High Energy Physics, 2021 (11). 169. doi:10.1007/jhep11(2021)169

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Abstract

A measurement of prompt photon-pair production in proton-proton collisions at s = 13 TeV is presented. The data were recorded by the ATLAS detector at the LHC with an integrated luminosity of 139 fb−1. Events with two photons in the well-instrumented region of the detector are selected. The photons are required to be isolated and have a transverse momentum of pT, γ12> 40 (30) GeV for the leading (sub-leading) photon. The differential cross sections as functions of several observables for the diphoton system are measured and compared with theoretical predictions from state-of-the-art Monte Carlo and fixed-order calculations. The QCD predictions from next-to-next-to-leading-order calculations and multi-leg merged calculations are able to describe the measured integrated and differential cross sections within uncertainties, whereas lower-order calculations show significant deviations, demonstrating that higher-order perturbative QCD corrections are crucial for this process. The resummed predictions with parton showers additionally provide an excellent description of the low transverse-momentum regime of the diphoton system.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Divisions:	Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH):	Hadrons -- Scattering, Collisions (Nuclear physics), Photon-photon interactions, Quantum theory, Photon detectors, Large Hadron Collider (France and Switzerland)
Journal or Publication Title:	Journal of High Energy Physics
Publisher:	Springer
ISSN:	1029-8479
Official Date:	22 November 2021
Dates:	Date Event 22 November 2021 Published 25 October 2021 Accepted
Volume:	2021
Number:	11
Article Number:	169
DOI:	10.1007/jhep11(2021)169
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Open Access (Creative Commons)
Date of first compliant deposit:	26 January 2022
Date of first compliant Open Access:	26 January 2022
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Contributors:	Contribution Name Contributor ID Research Group The ATLAS collaboration, UNSPECIFIED

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