Performance in muon identification and muon momentum measurement by the compact muon solenoid experiment at the LHC

The Compact Muon Solenoid (CMS) experiment at the LHC is based on a 4T superconducting solenoid. The muon momentum is measured in three ways - bending angle measurement immediately after the coil, sagitta measurement in the return yoke, and sagitta measurement in the inner tracker. The first two measurements are performed with the muon detector alone, independent of the inner tracker (stand alone measurement). The best resolution is obtained when all three methods are combined. The simulated performance for both stand alone and best resolutions will be presented for momenta from a few GeV to a few TeV in rapidity range from 0 to 2.4. The redundency of the measurement makes the system robust against background. Effect of the background or muon identification will be presented. Benchmark physics processes will be used to illustrate the performance of the muon system.