Speaker
Description
The discovery of the Higgs boson by the ATLAS and CMS experiments marked the beginning of a new era of precision measurements at the Large Hadron Collider. To fully exploit its physics potential, the High-Luminosity LHC will operate at substantially increased luminosities, resulting in much higher radiation levels and event densities. In response, CMS is upgrading its forward muon system with Gas Electron Multiplier (GEM) detectors. To ensure efficient, selective, and precise muon reconstruction in the forward region (1.55 < |η| < 2.8), three new GEM-based stations, GE1/1, GE2/1, and ME0, are being installed. These detectors provide excellent spatial resolution, high-rate capability, and radiation tolerance, while complementing the existing CSC and RPC systems. In particular, the GE1/1 station, composed of 144 triple-GEM detectors arranged in super-chambers on both CMS endcaps, covers the range 1.55 < |η| < 2.18 and delivers high efficiency and robust performance, significantly enhancing muon triggering and tracking during Run-3 and beyond. This work presents an overview of the CMS muon spectrometer upgrade with GEM detectors, focusing on the operational experience and performance studies of the GE1/1 station.
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