# Measurement of isolated-photon pair production in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector

6 Laboratoire de Physique Corpusculaire
LPC - Laboratoire de Physique Corpusculaire [Clermont-Ferrand]
7 APC - Neutrinos
LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies, APC - UMR 7164 - AstroParticule et Cosmologie
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 sqrt(s) = 7 TeV. 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 (|eta|<1.37 and 1.52<|eta|<2.37) and with an angular separation Delta R>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.
Document type :
Journal articles
Journal of High Energy Physics, Springer, 2013, 1, pp.086. <10.1007/JHEP01(2013)086>

http://hal.in2p3.fr/in2p3-00750107
Contributor : Emmanuelle Vernay <>
Submitted on : Friday, November 9, 2012 - 8:11:46 AM
Last modification on : Tuesday, June 30, 2015 - 10:57:19 AM

### Citation

G. Aad, S. Albrand, M.L. Andrieux, Q. Buat, B. Clement, et al.. Measurement of isolated-photon pair production in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector. Journal of High Energy Physics, Springer, 2013, 1, pp.086. <10.1007/JHEP01(2013)086>. <in2p3-00750107>

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