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


Aad, G ORCID: 0000-0002-6665-4934, Abbott, B ORCID: 0000-0002-5888-2734, Abeling, K ORCID: 0000-0002-1002-1652, Abicht, NJ ORCID: 0000-0001-5763-2760, Abidi, SH ORCID: 0000-0002-8496-9294, Aboulhorma, A ORCID: 0000-0002-9987-2292, Abramowicz, H ORCID: 0000-0001-5329-6640, Abreu, H ORCID: 0000-0002-1599-2896, Abulaiti, Y ORCID: 0000-0003-0403-3697, Acharya, BS ORCID: 0000-0002-8588-9157 et al (show 2942 more authors) (2024) Electron and photon energy calibration with the ATLAS detector using LHC Run 2 data. Journal of Instrumentation, 19 (02). P02009-P02009.

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Abstract

<jats:title>Abstract</jats:title> <jats:p>This paper presents the electron and photon energy calibration obtained with the ATLAS detector using 140 fb<jats:sup>-1</jats:sup> of LHC proton-proton collision data recorded at √(<jats:italic>s</jats:italic>) = 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 <jats:italic>Z</jats:italic>-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 <jats:italic>Z</jats:italic>-boson decays, 0.4% at <jats:italic>E</jats:italic> <jats:sub>T</jats:sub> ∼ 10 GeV, and 0.3% at <jats:italic>E</jats:italic> <jats:sub>T</jats:sub> ∼ 1 TeV; for photons at <jats:italic>E</jats:italic> <jats:sub>T</jats:sub> ∼ 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 <jats:italic>J</jats:italic>/<jats:italic>ψ</jats:italic> → <jats:italic>ee</jats:italic> and radiative Z-boson decays.</jats:p>

Item Type: Article
Divisions: Faculty of Health and Life Sciences
Faculty of Science and Engineering > School of Physical Sciences
Faculty of Health and Life Sciences > Institute of Systems, Molecular and Integrative Biology
Depositing User: Symplectic Admin
Date Deposited: 04 Mar 2024 16:29
Last Modified: 16 Mar 2024 02:52
DOI: 10.1088/1748-0221/19/02/p02009
Open Access URL: https://iopscience.iop.org/article/10.1088/1748-02...
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3179097
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