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Chinese Physics C> 2007, Vol. 31> Issue(3) : 229-231 

Extract Signals by Fitting χ2 Distribution of the Kinematic Fit

  •  Institute of High Energy Physics, CAS, Beijing 100049, China

  • 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%.
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  • References

    [1] . Particl Data Group. Phys. Lett., 2004, B592: 612. Ablikim M et al(BES Collab.). Nucl. Instrum. Methods,2005, A552: 344

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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
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Received: 2006-07-10
Revised: 2006-08-17
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Extract Signals by Fitting χ2 Distribution of the Kinematic Fit

    Corresponding author: PING Rong-Gang,
  • Institute of High Energy Physics, CAS, Beijing 100049, China
  • Received Date: 2006-07-10
  • Accepted Date: 2006-08-17
  • Available Online: 2007-03-05

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%.

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