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

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 µm) for barrel Bhabha events (| cos θ| < 0.8) from J/ψ data taken in 2012.