The muon system of the CMS (Compact Muon Solenoid) experiment at the LHC (Large Hadron Collider, Geneva,Switzerland) consists of three gaseous detectors with complementary features: the Drift Tube Chambers (DT) inthe barrel and the Cathode Strips Chambers (CSC) in the forward region provide good spatial resolution, whilethe Resistive Plate Chambers (RPC), in both barrel and forward regions, have an excellent time resolution. Themeasurements of these detectors are used for triggering on muons in the hardware-based Level-1 trigger stage. TheGlobal Muon Trigger(GMT) processor is in charge of collecting and merging the information provided by the threedetectors. It transmits final L1 muon trigger candidates (GMT candidates) to the L1 Global Trigger Logic whichtakes the final trigger decision. The GMT algorithm allows to trace back the detectors whose measurements have beenused for each GMT candidate. This feature has been exploited to develop a method for the performance evaluationof the trigger provided by the RPC system.
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