4 Detector Performance

The CMS muon detector merges different detector tecniques operating in different environments and with different requirements. A glance into the overall detector performance is therefore required. The important parameter is the muon momentum resolution. The two detectors were carefully simulated in order to correctly reproduce test beam data and a Kalman filter algorithm for track reconstruction was implemented in the official simulation program. The overall performance of the muon detector is given in Figure 9, where the momentum resolution obtained using the muon system and the inner tracker data points in two relevant positions is reported. The solid line that fits the points shows that the resolution function scales in the same way in the barrel and encap regions, thus confirming that the parameters fixed for the muon chambers provides homogeneity inside the detector.

Figure 9: Muon chambers+inner tracker muon momentum resolution in two relevant positions of the detector.