ATLAS Muon System Performance & Detector Operation 2012

Muons are central in the study of some of the most important physics topics at the LHC. The ATLAS muon spectrometer is designed to provide excellent momentum resolution up to 1 TeV. By using events containing J/ψ, ϒ and Z bosons produced in pp collisions, the efficiency and the resolution of the muon spectrometer are determined from data and do not rely only on Monte Carlo simulation. This poster summarizes the detector performance achieved during the 2012 LHC run and reports the measured muon efficiency and momentum resolution, compared with the Monte Carlo simulation.