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Measurement of the photon identification efficiencies with the ATLAS detector using LHC Run-1 data

Collaboration, ATLAS; (2016) Measurement of the photon identification efficiencies with the ATLAS detector using LHC Run-1 data. Eur. Phys. J. C , 76 (12) , Article 666. 10.1140/epjc/s10052-016-4507-9. Green open access

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Abstract

The algorithms used by the ATLAS Collaboration to reconstruct and identify prompt photons are described. Measurements of the photon identification efficiencies are reported, using 4.9 fb$^{-1}$ of $pp$ collision data collected at the LHC at $\sqrt{s} = 7$ TeV and 20.3 fb$^{-1}$ at $\sqrt{s} = 8$ TeV. The efficiencies are measured separately for converted and unconverted photons, in four different pseudo rapidity regions, for transverse momenta between 10 GeV and 1.5 TeV. The results from the combination of three data-driven techniques are compared to the predictions from a simulation of the detector response, after correcting the electromagnetic shower momenta in the simulation for the average differences observed with respect to data. Data-to-simulation efficiency ratios used as correction factors in physics measurements are determined to account for the small residual efficiency differences. These factors are measured with uncertainties between 0.5% and 10% in 7 TeV data and between 0.5% and 3% in 8 TeV data, depending on the photon transverse momentum and pseudorapidity.

Type: Article
Title: Measurement of the photon identification efficiencies with the ATLAS detector using LHC Run-1 data
Open access status: An open access version is available from UCL Discovery
DOI: 10.1140/epjc/s10052-016-4507-9
Publisher version: http://dx.doi.org/10.1140/epjc/s10052-016-4507-9
Language: English
Additional information: © Springer International Publishing AG. 40 pages plus author list (57 pages total), 17 figures, 2 tables, submitted to Eur. Phys. J. C, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/PERF-2013-04/
Keywords: hep-ex, hep-ex
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery-pp.ucl.ac.uk/id/eprint/1507512
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