Calibration study of the X-T relation for the BESⅢ drift chamber

KANG Xiao-Lin; WU Ling-Hui; WU Zhi; LUO Tao; HU Chen; WANG Hai-Xia; FANG Shuang-Shi; HE Kang-Lin; LI Wei-Dong; LI Wei-Guo; LIU Huai-Min; MAO Ze-Pu; WANG Liang-Liang; YUAN Ye; ZHANG Yao

doi:10.1088/1674-1137/39/2/026002

Chinese Physics C> 2015, Vol. 39> Issue(2) : 026002 DOI: 10.1088/1674-1137/39/2/026002

Calibration study of the X-T relation for the BESⅢ drift chamber

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Offline calibration plays an important role in BESⅢ offline data processing. In order to achieve good spatial and momentum resolution, it is necessary to implement high precision offline calibration for the BESⅢ drift chamber. This paper studies the time-to-distance relations, which are important calibration constants for track reconstruction. The parameterization of the time-to-distance relation, studies of left-right asymmetry and studies of variation with entrance angle are performed. The impact of dead channels on the time-to-distance relation is given special attention in order to reduce the shift in measured momentum for tracks passing near dead cells. Finally we present the resolutions for barrel Bhabha events (|cosθ|<0.8) from a J/ψ data set taken in 2012. The average spatial resolution is 123 μ and the momentum resolution for 1.548 GeV/c Bhabha tracks is 11.9 MeV/c.

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KANG Xiao-Lin, WU Ling-Hui, WU Zhi, LUO Tao, HU Chen, WANG Hai-Xia, FANG Shuang-Shi, HE Kang-Lin, LI Wei-Dong, LI Wei-Guo, LIU Huai-Min, MAO Ze-Pu, WANG Liang-Liang, YUAN Ye and ZHANG Yao. Calibration study of the X-T relation for the BESⅢ drift chamber[J]. Chinese Physics C, 2015, 39(2): 026002. doi: 10.1088/1674-1137/39/2/026002

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Received: 2014-05-12
Revised: 2014-06-28

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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Calibration study of the X-T relation for the BESⅢ drift chamber

Corresponding author: KANG Xiao-Lin,

Corresponding author: WU Ling-Hui,

Received Date: 2014-05-12

Accepted Date: 2014-06-28

Available Online: 2015-02-05

Abstract: Offline calibration plays an important role in BESⅢ offline data processing. In order to achieve good spatial and momentum resolution, it is necessary to implement high precision offline calibration for the BESⅢ drift chamber. This paper studies the time-to-distance relations, which are important calibration constants for track reconstruction. The parameterization of the time-to-distance relation, studies of left-right asymmetry and studies of variation with entrance angle are performed. The impact of dead channels on the time-to-distance relation is given special attention in order to reduce the shift in measured momentum for tracks passing near dead cells. Finally we present the resolutions for barrel Bhabha events (|cosθ|<0.8) from a J/ψ data set taken in 2012. The average spatial resolution is 123 μ and the momentum resolution for 1.548 GeV/c Bhabha tracks is 11.9 MeV/c.

Calibration study of the X-T relation for the BESⅢ drift chamber

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通讯作者: 陈斌, bchen63@163.com

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