Track-Based Muon Alignment of the CMS Detector

The alignment of the CMS muon system is vital to maintaining reliable muon data. Misaligned muon detectors negatively impact the accuracy of recorded muon positions, which in turn affects the momentum resolution and sensitivity of the final physics analyses. To measure the misalignment of muon detectors, recorded muon tracks are used in a multidimensional fit on the misalignment degrees of freedom. The performance of this track-based alignment algorithm is measured by using muons in Z boson decays and evaluating the alignment’s accuracy in reconstructing the mass peak. Chamber alignment accuracies on the order of 100 $\upmu $m are achieved and alignment performance is presented using Run 2 data.