Measurement of the energy response of the ATLAS calorimeter to charged pions from <i>W</i><SUP>±</SUP> → τ<SUP>±</SUP> (→π<SUP>±</SUP>ν<sub>τ</sub>)ν<sub>τ</sub> events in Run 2 data



Abbott, B, Abbott, DC, Abud, A Abed, Abeling, K, Abhayasinghe, DK, Abidi, SH, Aboulhorma, A, Abramowicz, H, Abreu, H, Abulaiti, Y
et al (show 2882 more authors) (2022) Measurement of the energy response of the ATLAS calorimeter to charged pions from <i>W</i><SUP>±</SUP> → τ<SUP>±</SUP> (→π<SUP>±</SUP>ν<sub>τ</sub>)ν<sub>τ</sub> events in Run 2 data. EUROPEAN PHYSICAL JOURNAL C, 82 (3). 223-.

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Abstract

The energy response of the ATLAS calorimeter is measured for single charged pions with transverse momentum in the range $10<p_\textrm{T}<300$ GeV. The measurement is performed using 139 $\textrm{fb}^{-1}$ of LHC proton-proton collision data at $\sqrt{s}=13$ TeV taken in Run 2 by the ATLAS detector. Charged pions originating from $\tau$-lepton decays are used to provide a sample of high-$p_\textrm{T}$ isolated particles, where the composition is known, to test an energy regime that has not previously been probed by in situ single-particle measurements. The calorimeter response to single-pions is observed to be overestimated by ${\sim}2\%$ across a large part of the $p_{\textrm{T}}$ spectrum in the central region and underestimated by ${\sim}4\%$ in the endcaps in the ATLAS simulation. The uncertainties in the measurements are ${\lesssim}1\%$ for $15<p_\textrm{T}<185$ GeV in the central region. To investigate the source of the discrepancies, the width of the distribution of the ratio of calorimeter energy to track momentum, the energies per layer and response in the hadronic calorimeter are also compared between data and simulation.

Item Type: Article
Additional Information: 43 pages in total, author list starting page 27, 11 figures, 0 tables, 6 aux figures. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/JETM-2018-08
Uncontrolled Keywords: hep-ex, hep-ex
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 19 Apr 2022 15:03
Last Modified: 08 Oct 2023 20:09
DOI: 10.1140/epjc/s10052-022-10117-2
Open Access URL: https://link.springer.com/article/10.1140/epjc/s10...
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3153367