Speaker
Description
The reconstruction and precise measurement of muons are essential for a wide range of physics analyses within the ATLAS experiment at the Large Hadron Collider (LHC). During Run-3, the ATLAS Muon Spectrometer underwent major upgrades, most notably the installation of the New Small Wheel system, designed to improve tracking and triggering performance in the forward region. Assessing the performance of these new detectors with proton–proton collision data at a center-of-mass energy of 13.6 TeV is therefore a crucial step for ensuring the accuracy and reliability of physics results. Using well-known di-muon resonances, we provide a detailed evaluation of muon reconstruction, identification, and isolation efficiencies, as well as momentum scale and resolution. State-of-the-art techniques developed for Run-3 allow us to characterize the detector response with unprecedented precision. This contribution presents the latest results on muon performance, highlighting the impact of the recent upgrades on ATLAS physics capabilities.
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