The average muon detection efficiency of 137 CMS GE1/1 triple-GEM chambers was measured at 93.3% using 2023 collision data, with defect-free chambers reaching ~96%, confirming readiness for HL-LHC operation.
Acosta et al.,Large CMS Cathode Strip Chambers: Design and Performance, Nucl
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Efficiency measurements of GEM GE1/1 chambers in the upgraded CMS Endcap Muon System using 2023 collision data at $\sqrt{s}=13.6$ TeV
The average muon detection efficiency of 137 CMS GE1/1 triple-GEM chambers was measured at 93.3% using 2023 collision data, with defect-free chambers reaching ~96%, confirming readiness for HL-LHC operation.