Chinese Acad Sci, Inst High Energy Phys, Beijing 100039, Peoples R China
The accuracy of neutral track measurement by Barrel Shower Counter (BSC) at BES is investigated. The photon energy in BSC is corrected using radiative Bhabha events and the error is determined. The error of photon position in BSC is also determined using the e(+)e(-)-->gamma gamma(gamma) process. All these results can be applied to BES analysis including neutral tracks, and the systematic error can be remarkably reduced when the kinematic fit is adopted.