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

CollaborationWith : Ancu, Lucian Stefan / Bilbao De Mendizabal, Javier / Calace, Noemi / Chatterjee, Avishek / Clark, Allan Geoffrey / Coccaro, Andrea / Delitzsch, Chris Malena / Della Volpe, Domenico / Ferrere, Didier / Gadomski, Szymon / Golling, Tobias / Gonzalez Sevilla, Sergio / Gramling, Johanna Léna / Guescini, Francesco / Iacobucci, Giuseppe / Katre, Akshay / Khoo, Teng Jian / Lionti, Anthony Eric / March Ruiz, Luis / Mermod, Philippe / Miucci, Antonio / Nackenhorst, Olaf / Paolozzi, Lorenzo / Ristic, Branislav / Schramm, Steven / Sfyrla, Anna / Vallecorsa, Sofia / Wu, Xin
Published in European Physical Journal. C. 2016, vol. 76, no. 12, p. 666
Collection Open Access - SCOAP3
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 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.
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ATLAS COLLABORATION. Measurement of the photon identification efficiencies with the ATLAS detector using LHC Run-1 data. In: European Physical Journal. C, 2016, vol. 76, n° 12, p. 666. https://archive-ouverte.unige.ch/unige:90875

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Deposited on : 2017-01-05

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