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

Aaboud, M. and Aad, G. and Abbott, B. and Abdallah, J. and Abdinov, O. and Krasznahorkay, Attila and Pásztor, Gabriella and Tóth, József (2016) Measurement of the photon identification efficiencies with the ATLAS detector using LHC Run-1 data. EUROPEAN PHYSICAL JOURNAL C, 76 (12). ISSN 1434-6044

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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 √s = 7 TeV and 20.3 fb−1 at √s = 8 TeV. The efficiencies are measured separately for converted and unconverted photons, in four dif- ferent pseudorapidity 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 predic- tions 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 determ- ined 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 5.6% in 8 TeV data, depending on the photon transverse momentum and pseudorapidity.

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