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Addepalli, S. V.; Antel, C.; Arling, J.-H.; Balaji, S.; Basson, C. R.; Battaglia, M.; Bawa, H. S.; Bellerive, A.; Bellos, P.; Beresford, L.; Bhopatkar, V. S.; Bi, R.; Bielski, R.; Biswas, D.; Bozson, A. J.; Brahimi, N.; Bruni, G.; Cabrera Urbán, S.; Carney, R. M. D.; Chelkov, G. A.; Cooper-Sarkar, A. M.; Costanzo, D.; De Castro, S.; Dell’Acqua, A.; Derendarz, D.; Doria, A.; Erdmann, J.; Fayard, L.; Fu, Y.; Goblirsch-Kolb, M.; González de la Hoz, S.; Goossens, L.; Grefe, C.; Gupta, R.; Gutierrez Zagazeta, L. F.; Haaland, E. S.; Hamer, M.; Hansen, J. D.; Hasib, A.; Hays, C. P.; Hou, S.; Kaczmarska, A.; Karpova, Z. M.; Khoda, E. E.; Klingl, T.; Kong, A. X. Y.; Kuechler, J. T.; Kulchitsky, Y.; Lankford, A. J.; Lazzaroni, M.; Lehmann Miotto, G.; Lohwasser, K.; Lou, X.; Lozano Bahilo, J. J.; Luci, C.; MacDonald, J. C.; Maslennikov, A. L.; McNamara, P. C.; Mdhluli, J. E.; Miyagawa, P. S.; Mokgatitswane, G.; Muškinja, M.; Nag Nag, A.; Ng, Y. W. Y.; Nisati, A.; Oishi, R.; O’neill, A. P.; Owen, M.; Palestini, S.; Petridou, C.; Petukhova, K.; Pokharel, I.; Proudfoot, J.; Rajagopalan, S.; Rassloff, D. F.; Ricci, E.; Rimoldi, A.; Rivera Vergara, J. C.; Robles Gajardo, C. M.; Roepe, A. R.; Roland, B.; Rurikova, Z.; Schamberger, R. D.; Schumm, B. A.; Seidel, S. C.; Shope, D. R.; Sopkova, F.; Spieker, T. M.; Testa, M.; Thomson, E.; Trischuk, D. A.; Vallier, A.; Viehhauser, G. H. A.; Villaplana Perez, M.; Wang, P.; Weber, S. A.; Woźniak, K. W.; Yeletskikh, I.; Yorita, K.; Zhang, B.
The journal of high energy physics, 2021, Letnik: 2021, Številka: 11Journal Article
A bstract 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 p T , γ 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.
