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

Abstract
HTML
Reference
Related

PDF

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]	GUO Yun-Jun , HE Kang-Lin . Muon Identification Using the Efficiencies Ratio Method at BESⅡ. Chinese Physics C, 2007, 31(11): 1050-1055.
[2]	LIU Chang-Long , LU Yi-Ying , YIN LI . Effects of Additional Vacancy-Like Defects Produced by Ion Impealations on Boron Thermal Diffusion in Silicon. Chinese Physics C, 2005, 29(11): 1107-1111.
[3]	SHEN Shui-Fa , YU Xiao-Han . Decay of ⁸³Sr and Discussion of Its Daughter's Band Structures. Chinese Physics C, 2004, 28(S1): 78-80.
[4]	PENG Quan-Ling , SUN Jian , ZHAO Guang-Yuan , SHI Cai-Tu . Principle and Software Design of Helmhotz Coil Measurement System. Chinese Physics C, 2001, 25(9): 920-925.
[5]	Guo Hua . In-medium QMC Model Parameters and Quark Condensation in Nuclear Matter. Chinese Physics C, 1999, 23(5): 459-468.
[6]	Yang Jianjun , Ma Boqiang , Li Guanglie . Non-perturbative Quark Propagator and the Study of the Non-trivial Q² Dependence in the Nucleon Structure Functions. Chinese Physics C, 1997, 21(2): 146-156.
[7]	Yu Hong , Shen Qixing , Zhang Lin . Angular Distribution of Process e⁺e^－→τ⁺τ^－,τ^－→a₁υτ,a₁→ρπ and Characteristics of a₁ Meson. Chinese Physics C, 1994, 18(7): 583-590.
[8]	BES Collaboration . Experimental Study of Resonance f₂(1270) in the J/ψ Hadronic Decay. Chinese Physics C, 1993, 17(2): 97-106.
[9]	SANG Jian-Ping , LIU Chao-Shan , LIU Yong . Relation Between the Gap at Z=64 Subshell and the Abrupt Transition in the Region N=88～90. Chinese Physics C, 1991, 15(2): 150-157.
[10]	WU Zhong-Li . ANALYSIS OF THE MOMENTUM DISTRIBUTION WIDTH OF THE PREOJECTILE-LIKE-FRAGMENT FROM HEAVY ION COLLISIONS. Chinese Physics C, 1989, 13(8): 752-754.
[11]	HOU Ren-Chang , ZHAO Xuan . QUADRUPOLE-OCTUPOLE TWO-PHONON EXCITATIONS IN INELASTIC SCATTERING. Chinese Physics C, 1983, 7(2): 236-244.
[12]	Sa Ben-hao , Zhang Xi-zhen , Li Zhu-xia , Shi Yi-jin . A PRIMARY RESEARCH OF THE PHONON RENORMALIZATION OF NUCLEAR FIELD THEORY. Chinese Physics C, 1980, 4(3): 398-400.

Access

Get Citation

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.

RIS(for EndNote,Reference Manager,ProCite)

BibTex

Txt

Milestone

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

Article Metric

Article Views(4245)
PDF Downloads(510)
Cited by(0)

Policy on re-use

To reuse of subscription content published by CPC, the users need to request permission from CPC, unless the content was published under an Open Access license which automatically permits that type of reuse.

通讯作者: 陈斌, bchen63@163.com

1.
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.