The offline Data Quality Monitoring system of the ATLAS Muon Spectrometer

Abstract

The ATLAS detector has been designed to exploit the full discovery potential of the LHC proton-proton collider at CERN. Its Muon Spectrometer (MS) has been optimized to measure final state muons from those interactions with good momentum resolution in a wide momentum range. In order to ensure that the hardware, DAQ and reconstruction software of the ATLAS MS is functioning properly, Data Quality Monitoring (DQM) tools have been developed both for the online and the offline environment. The offline DQM is performed on histograms of interesting quantities, which are filled during data processing with the ATLAS software framework at the CERN Tier0 facility. Then those histograms can be displayed and browsed by shifters and experts. They are also given as input to the Data Quality Monitoring Framework (DQMF) application, which performs the actual data quality assessment and sets status flags. The offline muon DQM structure and content, as well as the corresponding tools developed, are presented, with examples from the cosmic ray data collected for the MS Barrel during the commissioning phase.