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

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 \(\sqrt{s} = 7\) \(\text {TeV}\) and 20.3 fb\(^{-1}\) at \(...

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Main Authors: Aaboud, Morad (Author) , Anders, Christoph (Author) , Andrei, George Victor (Author) , Baas, Alessandra Edda (Author) , Brandt, Oleg (Author) , Djuvsland, Julia Isabell (Author) , Dunford, Monica (Author) , Ferreira de Lima, Danilo Enoque (Author) , Geisler, Manuel Patrice (Author) , Giulini, Maddalena (Author) , Hanke, Paul (Author) , Jongmanns, Jan (Author) , Kluge, Eike-Erik (Author) , Kolb, Mathis (Author) , Kretz, Moritz (Author) , Kugel, Andreas (Author) , Lang, Valerie (Author) , Lisovyi, Mykhailo (Author) , Meier, Karlheinz (Author) , Meyer zu Theenhausen, Hanno (Author) , Narrias Villar, Daniel Isaac (Author) , Radescu, Voica (Author) , S̜ahinsoy, Merve (Author) , Schätzel, Sebastian (Author) , Scharf, Veit (Author) , Schöning, André (Author) , Schultz-Coulon, Hans-Christian (Author) , Sosa Corral, David E. (Author) , Stamen, Rainer (Author) , Starovoitov, Pavel (Author) , Suchek, Stanislav (Author) , Wessels, Martin (Author)
Corporate Author: ATLAS Collaboration (Author)
Format: Article (Journal)
Language:English
Published: 03 December 2016
In: The European physical journal. C, Particles and fields
Year: 2016, Volume: 76, Issue: 12
ISSN:1434-6052
DOI:10.1140/epjc/s10052-016-4507-9
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1140/epjc/s10052-016-4507-9
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Author Notes:ATLAS Collaboration*
Description
Summary: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 \(\sqrt{s} = 7\) \(\text {TeV}\) and 20.3 fb\(^{-1}\) at \(\sqrt{s} = 8\) \(\text {TeV}\). The efficiencies are measured separately for converted and unconverted photons, in four different pseudorapidity regions, for transverse momenta between 10 \(\text {GeV}\) and 1.5 \(\text {TeV}\). 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 \(\text {TeV}\) data and between 0.5% and 5.6% in 8 \(\text {TeV}\) data, depending on the photon transverse momentum and pseudorapidity.
Item Description:*ATLAS Collaboration: M. Aaboud, C.F. Anders, V. Andrei, A.E. Baas, O. Brandt, J.I. Djuvsland, M. Dunford, D.E. Ferreira de Lima, M.P. Geisler, M. Giulini, P. Hanke, J. Jongmanns, E.-E. Kluge, M. Kolb, M. Kretz, A. Kugel, V.S. Lang, M. Lisovyi, K. Meier, H. Meyer zu Theenhausen, D.I. Narrias Villar, V. Radescu, M. Sahinsoy, S. Schaetzel, V. Scharf, A. Schoening, H.-C. Schultz-Coulon, D. Sosa, R. Stamen, P. Starovoitov, S. Suchek, M. Wessels [und viele weitere Personen]
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Physical Description:Online Resource
ISSN:1434-6052
DOI:10.1140/epjc/s10052-016-4507-9

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