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抽取信号的χ2分布拟合方法

Rong-Gang PING,Xiao-Hu MO,Shu-Xian DU,Jing LIU,Lian-Liang MA,Cheng-Ping SHEN,Zhi-Yong WANG,Chang-Zheng YUAN

Kao Neng Wu Li Yu Ho Wu Li/High Energy Physics and Nuclear Physics（2007）

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Abstract
BESⅡ上测量ψ(2S)辐射衰变时,鉴于本底道的污染非常严重,提出了一种抽取信号事例数的χ2拟合方法.大量的蒙特卡罗模拟表明,信号道与各个本底道的χ2分布形状各不相同.这些特点提供了从数据的χ2分布中抽出信号道事例数的χ2拟合方法.从蒙特卡罗模拟的结果来看,χ2拟合方法的误差小于2%.
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Key words
radiative decay,fit to χ2 distribution,Monte-Carlo simulation
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