The contribution of Resistive Plate Chamber (RPC) to muon reconstruction in
CMS has been studied on a sample of muons collected in proton-proton collisions
at sqrt(s) = 7 TeV at the LHC in 2011. Muon reconstruction is performed using
the all-silicon inner tracker and with up to four stations of gas-ionization
muon detectors. Drift Tubes and Cathode Strip Chambers detect muons in the
barrel and endcap regions, respectively, and are complemented by the RPC
system. Measured distributions of reconstructed hits in the RPCs crossed by
muons from Z decays with a transverse momentum pT above 20 GeV/c are well
reproduced by the Monte Carlo simulation. From the samples of J/psi and Z
events, the efficiencies for muons with and without the inclusion of the RPC
hits in the muon track reconstruction are measured and compared with the
simulation. Using RPC information in track reconstruction improves up to about
3% of offline reconstruction efficiency for the muons in the region of pT above
7 GeV/c, in good agreement with simulation.Comment: Presented by Minsuk Kim at the XI workshop on Resistive Plate
Chambers and Related Detectors - RPC2012, INFN Laboratori Nazionali di
Frascati Italy, February 5-10, 201
