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

• Autor(a) principal: Fiolhais, M. C. N.
• Data de Publicação: 2021
• Outros Autores: Gonçalo, R., Veloso, F., Wolters, H., ATLAS Collaboration
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10316/105002; https://doi.org/10.1007/JHEP11(2021)169
• topic: Hadron-Hadron scattering (experiments); photon production; proton-proton scattering; QCD

A measurement of prompt photon-pair production in proton-proton collisions at p 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 wellinstrumented region of the detector are selected. The photons are required to be isolated and have a transverse momentum of pT, 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-leadingorder 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.