2011/09/15 by L. Millischer, Laurent Millischer, Millischer, Laurent
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High-Energy Particle Collisions Research #Particle Detector Development and Performance #Particle physics theoretical and experimental studies #hep-ex
paper · pdf · doi:10.48550/arxiv.1109.3310
Presented at DPF 2011
arxiv created 2011/09/15 · openalex publication_date 2011/09/15 · arxiv updated 2011/09/16 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
In this paper we present the measurement of the integrated and differential production cross sections of pairs of prompt isolated photons in proton-proton collisions at a centre-of-mass energy of 7 TeV with the Compact Muon Sollenoid (CMS) detector at the Large Hadron Collider (LHC). A next-to-leading order (NLO) perturbative QCD (pQCD) prediction was compared to the measurement, which was performed on a sample corresponding to an integrated luminosity of 36 inverse picobarn. While the agreement on integrated cross sections is satisfactory, a discrepancy is observed in the region of the phase space populated by photons with small relative angle, where the theoretical prediction underestimates the measured cross section.