Muon Reconstruction and Identification in CMS

An event reconstruction at LHC is a challenging task. The Compact Muon Solenoid (CMS) is a general purpose experiment with a precise and redundant Muon System. A good muon reconstruction and identification is one of its design goals. In CMS muons are initially identified by dedicated Level-1 muon trigger while the precise reconstruction is completed at the High-Level Trigger and offline. In this note the CMS Muon System is presented. The muon reconstruction algorithms both for event selection during triggering steps and offline, are described. The CMS experience with alignment of the Muon System using cosmic data are also given. European