A data-driven performance evaluation method for CMS RPC trigger through the CMS muon trigger

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) in the barrel and the Cathode Strips Chambers (CSC) in the forward region provide good spatial resolution, while the Resistive Plate Chambers (RPC), in both barrel and forward regions, have an excellent time resolution. The measurements of these detectors are used for triggering on muons in the hardware-based Level-1 trigger stage. The Global Muon Trigger(GMT) processor is in charge of collecting and merging the information provided by the three detectors. It transmits final L1 muon trigger candidates (GMT candidates) to the L1 Global Trigger Logic which takes the final trigger decision. The GMT algorithm allows to trace back the detectors whose measurements have been used for each GMT candidate. This feature has been exploited to develop a method for the performance evaluation of the trigger provided by the RPC system.