Subtraction of Beam-Associated Background in R Measurement

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

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%.

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