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Measurement of isolated-photon pair production in pp collisions at √s=7 TeV with the ATLAS detector

Research output: Contribution to journalArticle

Georges Aad, Bobby Acharya, ATLAS Collaboration

Original languageEnglish
Article number86
Pages (from-to)N/A
Number of pages41
JournalJHEP
Volume2013
Issue number1
DOIs
Publication statusPublished - Jan 2013

King's Authors

Abstract

The ATLAS experiment at the LHC has measured the production cross section of events with two isolated photons in the final state, in proton-proton collisions at s√=7TeV . The full data set collected in 2011, corresponding to an integrated luminosity of 4.9 fb−1, is used. The amount of background, from hadronic jets and isolated electrons, is estimated with data-driven techniques and subtracted. The total cross section, for two isolated photons with transverse energies above 25 GeV and 22 GeV respectively, in the acceptance of the electromagnetic calorimeter (|η| < 1.37 and 1.52 < |η| < 2.37) and with an angular separation ΔR > 0.4, is 44.0+3.2−4.2 pb. The differential cross sections as a function of the di-photon invariant mass, transverse momentum, azimuthal separation, and cosine of the polar angle of the largest transverse energy photon in the Collins-Soper di-photon rest frame are also measured. The results are compared to the prediction of leading-order parton-shower and next-to-leading-order and next-to-next-to-leading-order parton-level generators.

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