Measurement of the production cross section of pairs of isolated photons in <i>pp</i> collisions at 13 TeV with the ATLAS detector



Aad, G, Abbott, B, Abbott, DC, Abed Abud, A ORCID: 0000-0002-2788-3822, Abeling, K, Abhayasinghe, DK, Abidi, SH, Abramowicz, H, Abreu, H, Abulaiti, Y
et al (show 2877 more authors) (2021) Measurement of the production cross section of pairs of isolated photons in <i>pp</i> collisions at 13 TeV with the ATLAS detector. JOURNAL OF HIGH ENERGY PHYSICS, 11 (11). 169-.

Access the full-text of this item by clicking on the Open Access link.

Abstract

A measurement of prompt photon-pair production in proton-proton collisions at $\sqrt{s}=13$ 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 $p_\mathrm{T,\gamma_{1(2)}} > 40(30)$ 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: Article
Additional Information: 52 pages in total, author list starting page 36, 12 figures, 5 tables, published in JHEP. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2017-30/
Uncontrolled Keywords: Hadron-Hadron scattering (experiments), photon production, proton-proton scattering, QCD
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 12 Jan 2022 16:37
Last Modified: 16 Oct 2023 18:04
DOI: 10.1007/JHEP11(2021)169
Open Access URL: https://link.springer.com/article/10.1007%2FJHEP11...
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3146237