Studies of the muon momentum calibration and performance of the ATLAS detector with $pp$ collisions at $\sqrt{s}$=13 TeV

Abstract

This paper presents the muon momentum calibration and performance studies for the ATLAS detector based on the $pp$ collisions data sample produced at $\sqrt{s}$=13 TeV at the LHC during Run 2 and corresponding to an integrated luminosity of 139 fb${}^{-1}$. An innovative approach is used to correct for potential charge-dependent momentum biases related to the knowledge of the detector geometry, using the $Z\to {\mu }^{+}{\mu }^{-}$ resonance. The muon momentum scale and resolution are measured using samples of $J/\psi \to {\mu }^{+}{\mu }^{-}$ and $Z\to {\mu }^{+}{\mu }^{-}$ events. A calibration procedure is defined and applied to simulated data to match the performance measured in real data. The calibration is validated using an independent sample of ${\rm Y}\to {\mu }^{+}{\mu }^{-}$ events. At the $Z$ ($J/\psi$) peak, the momentum scale is measured with an uncertainty at the 0.05% (0.1%) level, and the resolution is measured with an uncertainty at the 1.5% (2%) level. The charge-dependent bias is removed with a dedicated {\em in situ} correction for momenta up to 450 GeV with a precision better than 0.03 TeV${}^{-1}$.

arXiv comment54 pages in total, author list starting at page 37, 15 figures, 3 tables. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/MUON-2022-01/

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