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

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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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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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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.