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→μ+μ− resonance. The muon momentum scale and resolution are measured using samples of J/ψ→μ+μ− and Z→μ+μ− 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 Υ→μ+μ− events. At the Z (J/ψ) 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 in situ correction for momenta up to 450 GeV with a precision better than 0.03 TeV−1.

Studies of the muon momentum calibration and performance of the ATLAS detector with pp collisions at sqrt(s) = 13 TeV

M Centonze;G Chiodini;E Gorini;S Grancagnolo;FG Gravili;M Greco;A Palazzo;M Primavera;S Spagnolo;A Ventura;
2023-01-01

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→μ+μ− resonance. The muon momentum scale and resolution are measured using samples of J/ψ→μ+μ− and Z→μ+μ− 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 Υ→μ+μ− events. At the Z (J/ψ) 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 in situ correction for momenta up to 450 GeV with a precision better than 0.03 TeV−1.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11587/500546
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