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

Mullier, Geoffrey; Haug, Sigve; Weber, Michael; Meloni, Federico; Cervelli, Alberto; Beck, Hans Peter; Stucci, Stefania; Ereditato, Antonio (2016). Measurement of the photon identification efficiencies with the ATLAS detector using LHC Run-1 data. European physical journal. C - particles and fields, 76(12) EDP Sciences 10.1140/epjc/s10052-016-4507-9

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

Item Type:

Journal Article (Original Article)


08 Faculty of Science > Physics Institute > Laboratory for High Energy Physics (LHEP)

UniBE Contributor:

Haug, Sigve; Weber, Michael and Beck, Hans Peter


500 Science > 530 Physics
500 Science > 510 Mathematics




EDP Sciences




Annette Krebs-Wegenast

Date Deposited:

26 Jul 2017 12:46

Last Modified:

30 Jul 2017 02:15

Publisher DOI:


Additional Information:

Kollaboration - Es sind nur die Berner Autoren namentlich erwähnt.




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