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

RONG Gang; CA Ji-Mao; MAO Hu-Shun; WANG Tai-Jie; BAI Jing-Zhi; LI Wei-Guo

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.

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[2]	XU Ming-Mei , LIU Lian-Shou . A Monte Carlo Study on the Reconstruction Method for Instanton in Deep-Inelastic e⁺p Scattering. Chinese Physics C, 2007, 31(2): 119-124.
[3]	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.
[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 Zheng , YUAN Chang-Zheng , QI Na-Ding . Study of BES Ⅱ Muon Counter Performance. Chinese Physics C, 2003, 27(8): 716-721.
[6]	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.
[7]	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.
[8]	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.
[9]	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/dx Measurement in the BES Large Cylindrical Drift Chamber. Chinese Physics C, 1996, 20(S3): 213-224.
[10]	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/dx in the BES Large Cylindrical Drift Chamber. Chinese Physics C, 1996, 20(7): 577-587.
[11]	Jiang Zhijin , Wang Taijie , Huang Tao . Primary Vertex Fitting in BES. Chinese Physics C, 1995, 19(1): 1-7.
[12]	BES Collaboration . Precise Measurement of τ Mass. Chinese Physics C, 1995, 19(2): 97-105.
[13]	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.
[14]	Zhu Qiming , Zhou Huashi , Jiang Chunhua , Ni Huiling . Determining the Luminosity for BES by Spectrum Analysis of Bhabha Events in Small Angle. Chinese Physics C, 1993, 17(12): 1057-1064.
[15]	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.
[16]	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.
[17]	CHEN Yuan-Bo , DONG Xue-Sheng , HUANG Yin-Zhi , LI Da-Shi , LIN Wei , LIU Yue-Jun , PAN Zhao-Hui , WU Wei-Min , YANG Chang-You , ZHANG Bing-Yun , ZHANG Chang-Chun , ZHAO Wei-Ren , ZHU Guo-Sheng . THE BES ON-LINE DATA ANALYSIS SYSTEM. Chinese Physics C, 1989, 13(8): 680-688.
[18]	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.
[19]	YAN Chen , ZHAO Yu-Min , SUN Han-Cheng , YANG Chang-Gen , TANG Xiao-Wei . THE STUDY OF AN ELECTROSTATIC SPHERICAL GRID RETARDING SPECTROMETER FOR THE STUDY OF NEUTRINO REST MASS BY MEASURING BETA SPECTRUM FROM TRITIUM DECAY. Chinese Physics C, 1988, 12(6): 721-725.
[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
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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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