Measurement of the photon identification efficiencies with the ATLAS detector using LHC Run 2 data collected in 2015 and 2016

Abstract

The efficiency of the photon identification criteria in the ATLAS detector is measured using 36.1 fb${}^{-1}$ to 36.7 fb${}^{-1}$ of $pp$ collision data at $\sqrt{s}$ = 13 TeV collected in 2015 and 2016. The efficiencies are measured separately for converted and unconverted isolated 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 with the predictions from simulation after correcting the variables describing the shape of electromagnetic showers in simulation for the average differences observed relative to data. Data-to-simulation efficiency ratios are determined to account for the small residual efficiency differences. These factors are measured with uncertainties between 0.5% and 5% depending on the photon transverse momentum and pseudorapidity. The impact of the isolation criteria on the photon identification efficiency, and that of additional soft $pp$ interactions, are also discussed. The probability of reconstructing an electron as a photon candidate is measured in data, and compared with the predictions from simulation. The efficiency of the reconstruction of photon conversions is measured using a sample of photon candidates from $Z\to \mu \mu \gamma$ events, exploiting the properties of the ratio of the energies deposited in the first and second longitudinal layers of the ATLAS electromagnetic calorimeter.

55 pages in total, author list starting page 39, 18 figures, 2 tables, published in EPJC. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/PERF-2017-02

References in corpus (28)

• PYTHIA 6.4 Physics and Manual
• PYTHIA 6.2 Physics and Manual
• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• A Brief Introduction to PYTHIA 8.1
• A general framework for implementing NLO calculations in shower Monte Carlo programs: the POWHEG BOX
• Matching NLO QCD computations with Parton Shower simulations: the POWHEG method
• Event generation with SHERPA 1.1
• The ATLAS Simulation Infrastructure
• PHOTOS Monte Carlo: a precision tool for QED corrections in Z and W decays
• Pileup subtraction using jet areas
• Performance of the ATLAS Trigger System in 2015
• The Catchment Area of Jets
• Muon reconstruction performance of the ATLAS detector in proton--proton collision data at $\sqrt{s}$=13 TeV
• Expected Performance of the ATLAS Experiment - Detector, Trigger and Physics
• Production and Integration of the ATLAS Insertable B-Layer
• Electron and photon energy calibration with the ATLAS detector using LHC Run 1 data
• Measurements of Higgs boson properties in the diphoton decay channel with 36 fb${}^{-1}$ of $pp$ collision data at $\sqrt{s}=13$ TeV with the ATLAS detector
• Electron reconstruction and identification in the ATLAS experiment using the 2015 and 2016 LHC proton-proton collision data at $\sqrt{s}$ = 13 TeV
• Search for new phenomena in high-mass diphoton final states using 37 fb${}^{-1}$ of proton-proton collisions collected at $\sqrt{s}=13$ TeV with the ATLAS detector
• Electron and photon energy calibration with the ATLAS detector using 2015-2016 LHC proton-proton collision data
• On the characterisation of the underlying event
• Reconstruction of primary vertices at the ATLAS experiment in Run 1 proton-proton collisions at the LHC
• Measurement of the photon identification efficiencies with the ATLAS detector using LHC Run-1 data
• Measurement of the Higgs boson mass in the $H\to Z{Z}^{\ast }\to 4\ell$ and $H\to \gamma \gamma$ channels with $\sqrt{s}=13$ TeV $pp$ collisions using the ATLAS detector
• Measurement of the cross section for inclusive isolated-photon production in $pp$ collisions at $\sqrt{s}=13$ TeV using the ATLAS detector
• Information and treatment of unknown correlations in the combination of measurements using the BLUE method
• Search for new phenomena with photon+jet events in proton-proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Performance of the ATLAS Transition Radiation Tracker in Run 1 of the LHC: tracker properties

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