• [1]

    . 　DING Hui-Liang et al (BES Collab. ) . HEP NP ,1992 ,16 :769 (inChinese)(丁慧良等(北京谱仪合作组) . 高能物理与核物理,1992 , 16 :769)2.　BAI Jing-Zhi et al (BES Collab. ) . BES Upgrade. Nucl . Instrum.Methods ,2001 ,A458 :6273.　ZHENG Zhi-Peng , ZHU Yong-Sheng. Physics in Collision at Beijing Spectrometer. Nanning : Science and Technique Publisher of Guangxi ,1998. 40 (in Chinese)(郑志鹏,朱永生. 北京谱仪正负电子物理. 南宁:广西科学技术出版社,1998. 40)4.　RONG Gang et al . HEP NP ,2001 ,25 :154 (in Chinese)(荣刚等. 高能物理与核物理,2001 ,25 :154)5.　ZHU Yong-Sheng et al . Probability and Statistics in Experimental Physics. Beijing :Science Publisher ,1991 (in Chinese)(朱永生等. 实验物理中的概率与统计. 北京: 科学出版社,1991)6.　Birks J B. Phys. Rev. ,1951 ,84 :3647.　Particle Data Group. Rhys. Rev. ,2002 ,D66 :1958.　Blum W. Particle Detection with Drift Chambers. New York :Springer-Verlag. 258