Abstract
The CMS experiment at the CERN Large Hadron Collider (LHC) has a redundant muon system composed by three different detector technologies: Cathode Strip Chambers (CSC, in the endcap regions), Drift Tubes (DT, in the barrel region), and Resistive Plate Chambers (RPC, both in the barrel and endcap). The RPC are designed mainly as a trigger detector but they contribute also to the muon reconstruction. Thus the monitoring and the analysis of the system performance are necessary and essential for the final data quality. The main detector characteristics and the hit efficiency and cluster size are presented in the paper. The stability of the system in the conditions of high instantaneous luminosity and high number of pile up (PU) events are presented in a view of history monitoring and stable trend.
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