Speaker
Description
A high-performance muon detector system is crucial to realise physics goals of the CMS experiment at the LHC. The CMS muon spectrometer, consisting of different detector technologies across different pseudorapidity (η) regions, demonstrated efficient tracking and triggering of muons during Run1 and Run2 of the LHC operations. The legacy CMS muon detector system, consists of drift tube (DT) chambers in the barrel and cathode strip chambers (CSC) in the endcap regions, complemented by Resistive Plate Chambers (RPC) in both the barrel and endcap. During the long shutdown (LS) 2 period, Gas Electron Multiplier (GEM) chambers were added in the first station of forward regions to enhance the redundancy of the muon system while maintaining the precision of muon momentum resolution at the Level-1 trigger. Several muon system upgrades are planned to withstand the challenging conditions of increased instantaneous luminosity and higher pileup expected during the high-luminosity LHC (HL-LHC) operation. The upgrades targeting the detector electronics have been completed for CSCs during LS2, while those planned for DTs will be implemented during LS3. Another GEM-based station (GE2/1) as well as the new generation RPC (iRPC) stations (RE3/1 and RE4/1), will be instrumented at high-η regions. Various detector demonstrators corresponding to these upgrades were installed in the CMS detector during LS2 to test new detection technologies and readout systems during Run3 with the aim to refine and optimise data-taking parameters and test the detector components before the final production and installation for future LHC upgrades. The performance studies for all four muon sub-detector systems, carried out using the first dataset collected at a collision energy of 13.6 TeV in 2022, are reported in this presentation. Furthermore, the operation stability and performance evaluation of the DT, GEM and iRPC demonstrators are also presented.
| Collaboration / Activity | CMS |
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