RPC Overall Efficiency Measurement from Tracker Muons

From the Run-II, the RPCMuon reconstruction algorithm is included in the standard reconstruction, where the algorithm starts from the inner track and finds matched RPC hits(RPCRecHits) along its trajectory. The track extrapolation is done in this step and the results of extrapolation are stored in the muon objects. For the efficiency measurement using the track extrapolation in the RPCMuons, we require TrackerMuon identification on the muons. The TrackerMuon identification is done by extrapolating inner tracks to muon systems to find matching DT/CSC segments. The TrackerMuon and RPCMuon reconstruction are designed to run independently, to be complementary algorithms to each other. We use the tag-and-probe method to remove bias from the triggers - start from the SingleMuon dataset and require one muon(tag) to pass identification and isolation cuts but also require to be matched to the trigger object to accept the event. Then we select another muon(probe) in the event to study the efficiency, requiring TrackerMuon identification and to form Z resonance.