Estimation of level-1 trigger efficiency of RPC detectors in CMS experiment using cosmic muon data

For the estimation of Level-1 trigger efficiency of RPC detector of the muon system in CMS experiment at the LHC, two data driven methods, Tag&Probe and DTvsRPC, have been studied using cosmic muons. The results presented are based on the data collected by CMS detector during 2008. These two methods are found to provide good estimates of RPC trigger efficiency and they are also in good agreement with each other in the geometrical acceptance.