The RPC hits in the CMS muon reconstruction

Muon tracks in the events collected by the Compact Muon Solenoid experiment at the Large Hadron Collider are reconstructed using the Drift Tubes in the central barrel region, Cathode Strip Chambers in the endcap region and Resistive Plate Chambers (RPC) in both the barrel and endcaps. The RPC system is mainly used as trigger detector, however it also contributes to the muon reconstruction. The number of reconstructed hits in the RPC chambers crossed by the muons with the high transverse momentum ($p_T >$ 20 GeV/$c$) coming from $Z^0$ decays can be used to study the efficiency for single muons reconstructed offline. The muon reconstruction efficiencies with and without the inclusion of the RPC measurements in the track fitting are reported here.