Chinese Physics C > 1993, Vol. 17 > Issue(10): 865-872

Application of dE/dx Method for e/π Identification to the Measurement of the Mass of τ Heavy Lepton by BES

Institute of High Energy Physics,Academia Sinica,Beijing 100039

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Abstract：
The application of dE/dx method for e/π identification to the measurement of the mass of τ heavy lepton by Beijing Spectrometer(BES) operated at Beijing Electron Positron Collider (BEPC) is described.With this method,the efficiency of selecting the eμ events from decaying from τ ⁺τ ^－is increased by a factor of more than 3 compared with using traditional e/π identification by electromagnetic shower measurement.It results in not only that the loss of the eμ events in off-line selection is reduced,but also that the amount of the time needed to run the BES/BEPC for data collection and computer CPU time for data off-line processing is reduced by ～75% for selecting the same number of τ ⁺τ ^－events.

References

[1]

Particle Data Group,J. J. Hernadez et al. ,Phys. Lev. B239(1990), I .2,Ⅱ.74.[2]丁慈良等，“北京谱仪”，高能物理与核物理，16(1992),769.[3]BES Collaboration,J. Z. Bai et al. ,SLAC-PUB-5870,BEPC-EP-92-O1 ,July 1992.[4]Mark-Ⅱ，Collaboration,R. M. Baltrusaitis et al. ,Phys. Rev. Lett. ,54(1985),1976.[5]毛慈顺，高能物理与核物理，10(1986),754;荣刚，"BES MDC dE/dx粒子辨认能力的棋拟研究"，第五次全国核电子学与探测器学术会议论文集，1990,8，兰州.[6]荣刚“北京谱仪主漂移室dE/dx系统效应的软件校正”，第四次全国高能实验物理学术会议，1991,10，北京.[7]荣刚，“北京谱仪dE/dx粒子鉴别的软件方法”，第四次全国离能实验物理学术会议，1991,10，北京.[8]荣刚，核电子学与探测技术，增刊12(1992),200.[9]Rong Gang ,"Note on BES dE/dx System",BES Collaboration Meeting, June 1992,Chengde/Beijing.[10]漆纳丁等，`л事例筛选”,BES内部报告，1992,1.

[1]	CAO Xue-Xiang,LI Wei-Dong,Roy A,LIU Chun-Lei,MAO Ze-Pu,CHEN Shen-Jian,DENG Zi-Yan,HE Kang-Lin,HUANG Xing-Tao,HUANG Bin,HUANG Yan-Ping,JIA Lu-Kui,JI Xiao-Bin,LI Xiu-Rong,LIU Chun-Yan,LIU Huai-Min,MA Qiu-Mei,MA Xiang,QIU Jin-Fa,WANG Da-Yong,WU Ling-Hui,WU Zhi,YUAN Ye,ZHANG Xue-Yao,ZHAO Chuan,ZHANG Yao,ZOU Jia-Heng. Studies of dE/dxmeasurements with the BESⅢ. Chinese Physics C, 2010, 34(12): 1852-1859.
[2]	QIN Hu,DONG Liao-Yuan,SHEN Xiao-Yan,JIN Shan,LUO Cheng-Lin. Weight of dE/dx and TOF in Particle Identification. Chinese Physics C, 2004, 28(7): 738-743.
[3]	WANG Zheng,YUAN Chang-Zheng,QI Na-Ding. Study of BES Ⅱ Muon Counter Performance. Chinese Physics C, 2003, 27(8): 716-721.
[4]	JI Xiao-Bin,SHEN Xiao-Yan. Performance Study of p,pin BES Ⅱ Detector. Chinese Physics C, 2003, 27(12): 1058-1061.
[5]	WANG Jun,LV Feng,TONG Guo-Liang,ZHANG Chang-Chun,HONG Tao,YUAN Jian-Ming,XU Ye. Study of Neutral Track Measurement at BESⅡ. Chinese Physics C, 2002, 26(2): 116-121.
[6]	HONG Tao,LV Feng,ZHANG Chang-Chun,TONG Guo-Liang,SHEN Xiao-Yan,MAO Ze-Pu,LI Wei-Guo,SUN Liang-Feng,BIAN Jian-Guo,WANG Jun,YU Guo-Wei,YUAN Jian-Ming. BESⅡ Error Matrix Correction on Charged Channel. Chinese Physics C, 2001, 25(7): 607-616.
[7]	HU Hai-Ming,QI Xiang-Rong,HUANG Guang-Shun,ZHAO Zheng-Guo. Initial State Radiative Correction in R Measurement at BES. Chinese Physics C, 2001, 25(8): 701-709.
[8]	HUANG GuangShun,CHENG BaoSen,YUAN ChangZheng,LI XinHua,QIXiangRong,LIU Jing,CHEN GuangPei,CHEN JiangChuan,HU HaiMing,HU Tao,JU Xin,LI Jin,MAO ZePu,XUE ShengTian,ZHANG LiangSheng,ZHENG ZhiPeng,ZHOU Li,ZHAO ZhengGuo. New Methods to Measure Integrated Luminosity at BES. Chinese Physics C, 2000, 24(5): 373-378.
[9]	Li Haibo,Yuan Changzheng,Li Jin,Li Xinhua. Study of Neutral Track Measurement at BES. Chinese Physics C, 1999, 23(7): 607-615.
[10]	Qian Chengde,Feng Sheng,Tong Guoliang,Wu Yigen. Electron Identification in the Measurement of MichelParameter in τ Lepton Decay. Chinese Physics C, 1998, 22(5): 388-392.
[11]	BES Collaboration. Measurements of the Branching Ratios for the Decays J/ψ→γπ⁰,γη, γη'→ 3γ at BES. Chinese Physics C, 1997, 21(5): 385-392.
[12]	Rong Gang,Ma Jimao,Mao Huishun,Bai Jingzhi,Xie Peipei,Yan Jie,Wang Yunyong,Mao Zepu,Liu Rongguang,Sun Shijun,Li Weiguo,Song Xiaofei,Wu Zhengdong. Study of Particle Identification Using dE/dxMeasurement in the BES Large Cylindrical Drift Chamber. Chinese Physics C, 1996, 20(S3): 213-224.
[13]	Rong Gang,Ma Jimao,Mao Huishun,Bai JingZhi,Xie Peipei,Yan Jie,Wang Yunyong,Mao Zepu,Liu Rongguang,Sun Shijun,Li Weiguo,Song Xiaofei,Wu Zhendong. Study of Particle Identification Using dE/dxin the BES Large Cylindrical Drift Chamber. Chinese Physics C, 1996, 20(7): 577-587.
[14]	Jiang Zhijin,Wang Taijie,Huang Tao. Primary Vertex Fitting in BES. Chinese Physics C, 1995, 19(1): 1-7.
[15]	Yu Zhongqiang,Zhao Dixin,Gu Jianhui,Guo Yanan,Zhang Bingyun,Ding Huiliang,Li Weidong. Trigger Efficiency Measurement of BES. Chinese Physics C, 1995, 19(12): 1062-1067.
[16]	BES Collaboration. Precise Measurement of τ Mass. Chinese Physics C, 1995, 19(2): 97-105.
[17]	BAI JINGZHI,BIAN QING,CHEN LEJUN,CHEN SHENNAN,CHEN YAQING,CHEN ZHAOQING,CHI YANKUN,CUI HUACHUAN,CUI XIANGZONG,DENG SHUEN,DENG YIWEI,DING HUILIANG,DONG BAOZHAONG,DONG XUESHENG,DU XIA,DU ZHIZHEN,FANG CHENG,FENG ZHONG,FU ZHENGSHAN,GAO CUISHAN,GAO MEILI,GAO SHUQI,GAO WENXIU,GAO YUANNING,GU SHUDI,GU WEIX,,,,,,,,,,,,,,,,,,,. Beijing Spectrometer. Chinese Physics C, 1992, 16(9): 769-789.
[18]	ZHANG Ge,ZHU Shan-Gen,ZHOU Yong-Shen,ZHAO Meng,ZHAO Di-Xin,LI Jia,HAN Shi-Wen,FU Zheng-Shan. Magnetic Axis Measurement in the Solenoid of Beijing Spectrometer. Chinese Physics C, 1991, 15(3): 200-206.
[19]	ZHU Yong-Sheng,ZHANG Liang-Sheng,GAO Wen-Xiu,ZHANG Yi-Ping,ZHAO Ping-De,ZHANG Jia-Wen,LI Fang,CHEN Le-Jun,XU Zhi-Qing. MUON COUNTER IN BES. Chinese Physics C, 1989, 13(7): 586-593.
[20]	MAO Hui-Shun. ESTIMATION OF ENERGY LOSS dE/dX AT MAIN DRIFT CHAMBEROF BEIJING SPECTROMETER. Chinese Physics C, 1986, 10(6): 752-756.

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RONG Gang, CA Ji-Mao, MAO Hu-Shun, WANG Tai-Jie, BAI Jing-Zhi and LI Wei-Guo. Application of dE/dx Method for e/π Identification to the Measurement of the Mass of τ Heavy Lepton by BES[J]. Chinese Physics C, 1993, 17(10): 865-872.

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Received: 1900-01-01
Revised: 1900-01-01

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通讯作者:陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Application of dE/dx Method for e/π Identification to the Measurement of the Mass of τ Heavy Lepton by BES

Corresponding author:RONG Gang,

Institute of High Energy Physics,Academia Sinica,Beijing 100039

Received Date:1900-01-01

Accepted Date:1900-01-01

Available Online:1993-10-05

Abstract:The application of dE/dx method for e/π identification to the measurement of the mass of τ heavy lepton by Beijing Spectrometer(BES) operated at Beijing Electron Positron Collider (BEPC) is described.With this method,the efficiency of selecting the eμ events from decaying from τ⁺τ^－is increased by a factor of more than 3 compared with using traditional e/π identification by electromagnetic shower measurement.It results in not only that the loss of the eμ events in off-line selection is reduced,but also that the amount of the time needed to run the BES/BEPC for data collection and computer CPU time for data off-line processing is reduced by ～75% for selecting the same number of τ⁺τ^－events.

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Application of dE/dx Method for e/π Identification to the Measurement of the Mass of τ Heavy Lepton by BES

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