Electron and photon energy calibration with the ATLAS detector using 2015-2016 LHC proton-proton collision data

M Aaboud, Torsten Åkesson, Simona Bocchetta, Lene Bryngemark, Eric Corrigan, Caterina Doglioni, Kristian Gregersen, Eva Brottmann Hansen, Vincent Hedberg, Göran Jarlskog, Charles Kalderon, Edgar Kellermann, Balazs Konya, Else Lytken, Katja Mankinen, Caterina Marcon, Ulf Mjörnmark, Geoffrey Mullier, Ruth Pöttgen, Trine PoulsenOxana Smirnova, L Zwalinski, ATLAS Collaboration

Research output: Contribution to journalArticlepeer-review


This paper presents the electron and photon energy calibration obtained with the ATLAS detector using about 36 fb -1 of LHC proton-proton collision data recorded at s=13 TeV in 2015 and 2016. The different calibration steps applied to the data and the optimization of the reconstruction of electron and photon energies are discussed. The absolute energy scale is set using a large sample of Z boson decays into electron-positron pairs. The systematic uncertainty in the energy scale calibration varies between 0.03% to 0.2% in most of the detector acceptance for electrons with transverse momentum close to 45 GeV . For electrons with transverse momentum of 10 GeV the typical uncertainty is 0.3% to 0.8% and it varies between 0.25% and 1% for photons with transverse momentum around 60 GeV . Validations of the energy calibration with J/ψ → e + e - decays and radiative Z boson decays are also presented. © 2019 CERN for the benefit of the ATLAS collaboration.
Original languageEnglish
Article numberP03017
JournalJournal of Instrumentation
Issue number3
Publication statusPublished - 2019

Bibliographical note

Export Date: 29 May 2019

Subject classification (UKÄ)

  • Subatomic Physics

Free keywords

  • calibration and fitting methods
  • Calorimeter methods
  • cluster finding
  • Pattern recognition
  • Performance of High Energy Physics Detectors
  • Bosons
  • Electrons
  • Germanium compounds
  • Momentum
  • Photons
  • Tellurium compounds
  • Electron-positron pairs
  • Energy calibration
  • Energy scale calibrations
  • Fitting method
  • High energy physics detector
  • Proton proton collisions
  • Systematic uncertainties
  • Calibration


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