Study of the calibration of X-T relation for the BESIII drift chamber

TL;DR

This paper details the calibration process of the X-T relation in the BESIII drift chamber, addressing asymmetries, dead channels, and achieving a spatial resolution of 123 μm for specific events.

Contribution

It presents a comprehensive calibration method for the X-T relation, including parameterization, asymmetry analysis, and correction for dead channels, improving tracking accuracy.

Findings

Achieved a spatial resolution of 123 μm for barrel Bhabha events.

Analyzed the impact of dead channels on the X-T relation.

Developed a parameterization method for the time-to-distance relation.

Abstract

This paper introduces the calibration of the time-to-distance relation for the BESIII drift chamber. The parameterization of the time-to-distance relation is presented. The studies of left-right asymmetry and the variation with the entrance angle are performed. The impact of dead channels on the time-to-distance relation is given special attention in order to reduce the shifts of the measured momenta for the tracks passing near dead cells. Finally we present the spatial resolution (123 {\mu}m) for barrel Bhabha events (|cos{\theta}|<0.8) from J/{\psi} data taken in 2012.