Speaker
Description
The CMS muon system has been a key component of the experiment’s physics performance throughout more than 15 years of LHC operation. It provides efficient muon triggering, identification, and momentum measurement over a wide pseudorapidity range, relying on multiple complementary detector technologies. During Run 1 and Run 2, the system was based on Drift Tubes, Cathode Strip Chambers, and Resistive Plate Chambers, which have operated with high stability and availability under steadily increasing luminosity, pileup, and radiation conditions. More recently, Gas Electron Multiplier (GEM) detectors have been installed in the forward region during the Long Shutdown 2 and have been successfully integrated into CMS operations at the start of Run 3. Continuous detector monitoring, calibration, and maintenance, together with targeted upgrade and consolidation campaigns, have preserved high performance. The CMS muon system has delivered high-quality data for triggering and offline reconstruction, enabling flagship results such as the Higgs boson discovery and precision measurements of Standard Model processes. This contribution reviews the long-term operational experience of the CMS muon system and discusses its performance evolution and readiness for the High-Luminosity LHC.
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