Subtraction of Beam-Associated Background in R Measurement

YAN Wen-Biao; CAI Xiao; CHI Shao-Peng; DAI Yu-Mei; HUANG Guang-Shun; LI Hui-Hong; WANG Zhi-Yong; ZHANG Lei; ZHANG Liang-Sheng; ZHAO Zheng-Guo

Chinese Physics C> 2002, Vol. 26> Issue(10) : 998-1003

Subtraction of Beam-Associated Background in R Measurement

Institute of High Energy Physics, CAS, Beijing 100039, China2 Department of Physics, Liaonin University, Shenyang 110036, China3 Institute of Particle Physics, Huazhong Normal University, Wuhan 430079, China4 China Center of Andvanced Science and Technology, Beijing 100080, China

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Abstract：
Using R scan data collected at BESⅡ detector, we study the character of beam-associated background. We use the method of f factor and the fitting of event vertices to subtract the residual beam-associated background. The difference between the R values obtained by using these two methods is between 0.3% and 2.3%.

References

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BAI J Z et al( BES collate.).Nucl. Inslr. Meth.，1994, A344:319; 2001，A458:627: DINC Hui-hung et al. HEYNP1992, 16:769(in Chinese)(丁慈良等.高能物理与核物理，1992, 16:769)2 BAI J Z，et al (RFS Collate.).Phys. Rev. Lett., 2000, 84:5943 BAI J Z et al ( RFS Collab.).Phys. Rev. Lett.，2002,88:1018024 ZHANG L. S et al. BES Internal Memorandum, 20005 MENC X C, Nuclear Electronics Detection Technology, 1996, 16;3886 MEND X C, Nuclear Electronics Detection Technology, 1997, 17:4787 Edwardfi C et al(Crystal Ball Colleb.).SLAC-PUB-5160, 1990

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YAN Wen-Biao, CAI Xiao, CHI Shao-Peng, DAI Yu-Mei, HUANG Guang-Shun, LI Hui-Hong, WANG Zhi-Yong, ZHANG Lei, ZHANG Liang-Sheng and ZHAO Zheng-Guo. Subtraction of Beam-Associated Background in R Measurement[J]. Chinese Physics C, 2002, 26(10): 998-1003.

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Received: 2002-01-22
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Subtraction of Beam-Associated Background in R Measurement

Corresponding author: YAN Wen-Biao,

Institute of High Energy Physics, CAS, Beijing 100039, China2 Department of Physics, Liaonin University, Shenyang 110036, China3 Institute of Particle Physics, Huazhong Normal University, Wuhan 430079, China4 China Center of Andvanced Science and Technology, Beijing 100080, China

Received Date: 2002-01-22
Accepted Date: 1900-01-01
Available Online: 2002-10-05

Abstract: Using R scan data collected at BESⅡ detector, we study the character of beam-associated background. We use the method of f factor and the fitting of event vertices to subtract the residual beam-associated background. The difference between the R values obtained by using these two methods is between 0.3% and 2.3%.