Balazs Konya
Researcher
Electron and photon energy calibration with the ATLAS detector using LHC Run 2 data
Author
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