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Image of Hannah Herde in front of Fysicum captured by Johan Joelsson

Hannah Herde

Interests: Higgs physics • dark matter searches • solid state tracking detectors • track reconstruction • active teaching methods • digital art • improv

Image of Hannah Herde in front of Fysicum captured by Johan Joelsson

Electron and photon energy calibration with the ATLAS detector using LHC Run 2 data

Author

  • G Aad
  • Torsten Åkesson
  • Caterina Doglioni
  • Alexander Ekman
  • Vincent Hedberg
  • Hannah Herde
  • Balazs Konya
  • Else Lytken
  • Ruth Pöttgen
  • Nathan Daniel Simpson
  • Oxana Smirnova
  • L. Zwalinski
Show all

Summary, in English

This paper presents the electron and photon energy calibration obtained with the ATLAS detector using 140 fb−1 of LHC proton-proton collision data recorded at √s = 13 TeV between 2015 and 2018. Methods for the measurement of electron and photon energies are outlined, along with the current knowledge of the passive material in front of the ATLAS electromagnetic calorimeter. The energy calibration steps are discussed in detail, with emphasis on the improvements introduced in this paper. The absolute energy scale is set using a large sample of Z-boson decays into electron-positron pairs, and its residual dependence on the electron energy is used for the first time to further constrain systematic uncertainties. The achieved calibration uncertainties are typically 0.05% for electrons from resonant Z-boson decays, 0.4% at ET ∼ 10 GeV, and 0.3% at ET ∼ 1 TeV; for photons at ET ∼ 60 GeV, they are 0.2% on average. This is more than twice as precise as the previous calibration. The new energy calibration is validated using J/ → ee and radiative Z-boson decays. © 2024 Institute of Physics. All rights reserved.

Department/s

  • Particle and nuclear physics
  • eSSENCE: The e-Science Collaboration
  • Department of Physics

Publishing year

2024

Language

English

Publication/Series

Journal of Instrumentation

Volume

19

Issue

2

Document type

Journal article

Publisher

IOP Publishing

Topic

  • Subatomic Physics

Keywords

  • calibration
  • Calorimeter methods; Pattern recognition
  • cluster finding
  • fitting methods; Performance of High Energy Physics Detectors
  • Bosons
  • Calorimeters
  • Electron energy levels
  • Electrons
  • Pattern recognition
  • Photons
  • Tellurium compounds
  • Calorimeter method;
  • Cluster finding
  • Electrons energy
  • Energy calibration
  • Fitting method
  • Fitting method;
  • High energy physics detector
  • Performance
  • Performance of high energy physic detector
  • Photon energy
  • Calibration

Status

Published

ISBN/ISSN/Other

  • ISSN: 1748-0221