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Measurement of the photon identification efficiencies with the ATLAS detector using LHC Run-1 data
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
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Number of Authors: 28402016 (English)In: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 76, article id 666Article in journal (Refereed) Published
Abstract [en]

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 root s = 7 TeV and 20.3 fb-1 at root 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.

Place, publisher, year, edition, pages
2016. Vol. 76, article id 666
Keywords [en]
Hadron-Collisions
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:uu:diva-314288DOI: 10.1140/epjc/s10052-016-4507-9ISI: 000389890600001OAI: oai:DiVA.org:uu-314288DiVA, id: diva2:1070426
Funder
EU, Horizon 2020EU, FP7, Seventh Framework Programme
Note

ATLAS Collaboration, for complete list of authors see http://dx.doi.org/10.1140/epjc/s10052-016-4507-9

Available from: 2017-02-01 Created: 2017-02-01 Last updated: 2017-11-29Bibliographically approved

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Bergeås Kuutmann, ElinBrenner, RichardEkelöf, TordEllert, MattiasFerrari, ArnaudÖhman, HenrikPelikan, DanielRangel-Smith, Camilla
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