Alignment and measurement of the magnetic field for the BESIII muon counter

TL;DR

This paper presents the first measurement of the magnetic field in the BESIII muon counter and details the alignment process, significantly improving muon detection accuracy and reducing systematic uncertainties in physics analyses.

Contribution

The study introduces the first magnetic field measurement of the BESIII muon counter and implements an alignment procedure using cosmic ray and di-muon data.

Findings

Magnetic field strength in the muon counter measured for the first time.

Alignment reduces offsets in muon hit positions.

Improved muon identification accuracy.

Abstract

Based on cosmic ray events without a magnetic field taken with the BESIII detector during the summer shutdown of BEPCII in 2012 and di-muon events from a data sample taken at center-of-mass energy of 3.686 GeV in 2009, we compare the coordinates of hits registered in the BESIII muon counter with the expected interaction point extrapolated from reconstructed tracks from the inner tracking system in the absence of a magnetic field. By minimizing the difference, we align the muon counter with the inner tracking system. Moreover, the strength of the magnetic field in the muon counter is measured for the first time with di-muon events from data taken at a center-of-mass energy of 3.686~GeV. After the alignment and the magnetic field strength measurement, the offsets in the reconstructed hit positions for muon tracks are reduced, which improves the muon identification. The alignment and magnetic field strength measurement have been adopted in the latest version of the BESIII offline software system. This addition to the software reduces the systematic uncertainty for the physics analysis in cases where the muon counter information is used.