Measurement of isolated-photon pair production in collisions at TeV with the ATLAS detector
Collaboration
24 pages
Published in:
- JHEP 01 (2013) 086
e-Print:
- 1211.1913 [hep-ex]
Report number:
- CERN-PH-EP-2012-300
Experiments:
Citations per year
Abstract: (Springer)
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 . 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 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.Note:
- 24 pages plus author list (45 pages total), 5 figures, 5 tables, submitted to JHEP. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2012-05/
- hadron-hadron scattering
- higher-order: 2
- photon: transverse energy
- calorimeter: electromagnetic
- higher-order: 1
- higher-order: 0
- jet: hadronic
- p p: scattering
- two-photon
- ATLAS
References(34)
Figures(17)
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