Extract Signals by Fitting χ2 Distribution of the Kinematic Fit

  • In measuring the ψ(2S) radiative decays at BESⅡ, contribution of the background is serious in most of the final states. To extract the number of signal events, a fit to the χ2 distribution of kinematic fit using signal and background components is proposed. Extensive Monte-Carlo simulations (MCS) are performed, and the results show that the shape of χ2 distribution of the signal channel looks different from those of the background channels, thus it provides us by fitting the χ2 distribution of the data to extract the number of signal events. An input-output test is performed using MCS, and the uncertainty of the fit method is found to be less than 2%.
  • 加载中
  • [1] . Particl Data Group. Phys. Lett., 2004, B592: 612. Ablikim M et al(BES Collab.). Nucl. Instrum. Methods,2005, A552: 344
  • 加载中

Get Citation
PING Rong-Gang, MO Xiao-Hu, DU Shu-Xian, LIU Jing, MA Lian-Liang, SHEN Cheng-Ping, WANG Zhi-Yong and YUAN Chang-Zheng. Extract Signals by Fitting χ2 Distribution of the Kinematic Fit[J]. Chinese Physics C, 2007, 31(3): 229-231.
PING Rong-Gang, MO Xiao-Hu, DU Shu-Xian, LIU Jing, MA Lian-Liang, SHEN Cheng-Ping, WANG Zhi-Yong and YUAN Chang-Zheng. Extract Signals by Fitting χ2 Distribution of the Kinematic Fit[J]. Chinese Physics C, 2007, 31(3): 229-231. shu
Milestone
Received: 2006-07-10
Revised: 2006-08-17
Article Metric

Article Views(2512)
PDF Downloads(833)
Cited by(0)
Policy on re-use
To reuse of subscription content published by CPC, the users need to request permission from CPC, unless the content was published under an Open Access license which automatically permits that type of reuse.
通讯作者: 陈斌, bchen63@163.com
  • 1. 

    沈阳化工大学材料科学与工程学院 沈阳 110142

  1. 本站搜索
  2. 百度学术搜索
  3. 万方数据库搜索
  4. CNKI搜索

Email This Article

Title:
Email:

Extract Signals by Fitting χ2 Distribution of the Kinematic Fit

    Corresponding author: PING Rong-Gang,
  • Institute of High Energy Physics, CAS, Beijing 100049, China

Abstract: In measuring the ψ(2S) radiative decays at BESⅡ, contribution of the background is serious in most of the final states. To extract the number of signal events, a fit to the χ2 distribution of kinematic fit using signal and background components is proposed. Extensive Monte-Carlo simulations (MCS) are performed, and the results show that the shape of χ2 distribution of the signal channel looks different from those of the background channels, thus it provides us by fitting the χ2 distribution of the data to extract the number of signal events. An input-output test is performed using MCS, and the uncertainty of the fit method is found to be less than 2%.

    HTML

Reference (1)

目录

/

DownLoad:  Full-Size Img  PowerPoint
Return
Return