A Kinematic Fit Method for All-Photon Events

DU Shu-Xian; YUAN Chang-Zheng

Chinese Physics C> 2006, Vol. 30> Issue(7) : 670-674

A Kinematic Fit Method for All-Photon Events

DU Shu-Xian ,
YUAN Chang-Zheng ^,

Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China2 Graduate University of Chinese Academy of Sciences, Beijing 100049, China

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Abstract：
An improved kinematic fit method is developed for analyzing all-photon events, where the interaction point is unknown. The fitting algorithm is checked with Monte Carlo samples to ensure that the fitting program works properly. This is applied to the Monte Carlo simulated ψ(2S) decays. A higher efficiency is achieved. This method can be generally applied to analyzing all-photon events at electron-positron collider.

References

[1]

. ZHENG Zhi-Peng, ZHU Yong-Sheng et al. Electron-Positron Physics at BES. Nanning: Guangxi Science Technology Publishing House, 1998(in Chinese)(郑志鹏，朱永生等.北京谱仪正负电子物理.南宁:广西科学技术出版社，1998)2. BAI Jing-Zhi et al. Nucl. Instr. Meth., 1994, A344: 319-334; BAI Jing-Zhi et al. Nucl. Instr. Meth., 2001, A458:627-6373. DU Shu-Xian, YUAN Chang-Zheng, LIU Jue-Ping et al.HEP NP, 2003, 27(6): 521-525(in Chinese)(杜书先，苑长征，刘觉平等.高能物理与核物理，2003, 27(6):521-525)4. ZHU Yong-Sheng. Probability and Statistics in Experiment Physics. Beijing: Science Press, 1991(in Chinese)(朱永生.实验物理中的概率和统计.北京:科学出版社，1991)5. Frodesen A G, Skjeggestad O, T#934;fte H. Probability and Statistics in Particle Physics. New York: Columbia University Press, 1979

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DU Shu-Xian and YUAN Chang-Zheng. A Kinematic Fit Method for All-Photon Events[J]. Chinese Physics C, 2006, 30(7): 670-674.

DU Shu-Xian and YUAN Chang-Zheng. A Kinematic Fit Method for All-Photon Events[J]. Chinese Physics C, 2006, 30(7): 670-674. shu

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Received: 2006-01-17
Revised: 2006-02-17

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沈阳化工大学材料科学与工程学院沈阳 110142

A Kinematic Fit Method for All-Photon Events

DU Shu-Xian
YUAN Chang-Zheng ^,

Corresponding author: YUAN Chang-Zheng,

Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China2 Graduate University of Chinese Academy of Sciences, Beijing 100049, China

Received Date: 2006-01-17
Accepted Date: 2006-02-17
Available Online: 2006-07-05

Abstract: An improved kinematic fit method is developed for analyzing all-photon events, where the interaction point is unknown. The fitting algorithm is checked with Monte Carlo samples to ensure that the fitting program works properly. This is applied to the Monte Carlo simulated ψ(2S) decays. A higher efficiency is achieved. This method can be generally applied to analyzing all-photon events at electron-positron collider.