Resolution of the ATLAS muon spectrometer monitored drift tubes in LHC Run 2
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Peer-reviewed
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Abstract
The momentum measurement capability of the ATLAS muon spectrometer relies
fundamentally on the intrinsic single-hit spatial resolution of the monitored
drift tube precision tracking chambers. Optimal resolution is achieved with a
dedicated calibration program that addresses the specific operating conditions
of the 354000 high-pressure drift tubes in the spectrometer. The calibrations
consist of a set of timing offsets and drift time to drift distance transfer
relations, and result in chamber resolution functions. This paper describes
novel algorithms to obtain precision calibrations from data collected by ATLAS
in LHC Run 2 and from a gas monitoring chamber, deployed in a dedicated gas
facility. The algorithm output consists of a pair of correction constants per
chamber which are applied to baseline calibrations, and determined to be valid
for the entire ATLAS Run 2. The final single-hit spatial resolution, averaged
over 1172 monitored drift tube chambers, is
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1748-0221