The offline data quality monitoring of the BESIII end cap TOF system

摘要

Purpose The end cap time of flight (TOF) at Beijing spectrometer was upgraded with multi-gap resistive plate chamber technology in order to improve the particle identification capability in 2015. The offline data quality monitoring is a critical aspect of the data processing chain aiming at providing data with good quality for physics analyses. Methods An offline data quality monitoring tool for upgraded end cap TOF has been developed to provide feedback about the functioning and performance of detector hardware and data processing chain. Results Detector information and reconstructed time-of- flight characteristics of charged tracks are filled into plots using full Bhabha events reconstruction results, and then, these plots are used to assess the operational conditions of the detector and the quality of the data by the experts. Conclusion This paper is describing the design and the content of performance of the offline data quality monitoring of end cap TOF and the data quality performance achieved during last 2 years' physical data taking.