Experimental Measurement of the Mass of the <i>τ</i> Lepton at the Beijing Electron Positron Collider (BEPC)

BES Collaboration

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《中国物理C》（英文）编辑部

2024年10月30日

Chinese Physics C> 1992, Vol. 16> Issue(S4) : 343-354

Experimental Measurement of the Mass of the τ Lepton at the Beijing Electron Positron Collider (BEPC)

BES Collaboration

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Abstract：
The τ lepton mass was measured with the data taken by the Beijing spectrometer (BES) at the BEPC at the Institute of High Energy Physics in Beijing. Approximately 5000 nb^-1 integrated luminosity was accumulated. Pairs of τ lepton produced near the threshold have been studied in eμ final states. The maximum likelihood method was used for both of predicting a sequence of experimental energies to approach the threshold and data fitting. The measurement yields the τ mass of 1776.9_-0.5^+0.4 ±02 MeV.

[1]	CAI Xiao , FU Cheng-Dong , MO Xiao-Hu , QIN Qing , WANG Yi-Fang , ZHANG Jian-Yong . A scenario for high accuracy τ mass measurement at BEPC-Ⅱ. Chinese Physics C, 2012, 36(7): 573-577. doi: 10.1088/1674-1137/36/7/001
[2]	ZHANG Yuan , YU Cheng-Hui , JI Da-Heng , XU Gang , WEI Yuan-Yuan , QIN Qing . Measurement and correction of coupling in BEPCⅡ. Chinese Physics C, 2011, 35(12): 1143-1147. doi: 10.1088/1674-1137/35/12/012
[3]	MO Xiao-Hu , CHU Yuan-Ping , DONG Hai-Yi , FU Cheng-Dong , LI Xiao-Nan , LIU Qian , QU Hua-Min , QIN Qing , SHEN Cheng-Ping , WANG Yi-Fang , XU Jin-Qiang , ZHANG Jian-Yong , ZHANG Qing-Jiang , ZHANG Yin-Hong , ZHANG Tian-Bao , ZHAO Zhuo . Beam energy measurement system at BEPCⅡ. Chinese Physics C, 2010, 34(6): 912-917. doi: 10.1088/1674-1137/34/6/050
[4]	MO Xiao-Hu , ZHANG Jian-Yong , ZHANG Tian-Bao , ZHANG Qing-Jiang , Achasov Mikhail , FU Cheng-Dong , Muchnoi Nikolay , QIN Qing , QU Hua-Min , WANG Yi-Fang , WU Jing-Min , XU Jin-Qiang , YU Bo-Xiang . Measurement of radiation dose at the north interaction point of BEPCⅡ. Chinese Physics C, 2009, 33(10): 914-921. doi: 10.1088/1674-1137/33/10/017
[5]	LIU Yu-Dong , YUE Jun-Hui , WANG Na . Studies on electron cloud instability in BEPCⅡ. Chinese Physics C, 2009, 33(S2): 71-74. doi: 10.1088/1674-1137/33/S2/018
[6]	MO Xiao-Hu , FU Cheng-Dong , ZHANG Jian-Yong , QIN Qing , QU Hua-Min , WANG Yi-Fang , XU Jin-Qiang , ZHANG Tian-Bao . Working principles of the energy measurement system at BEPCⅡ. Chinese Physics C, 2008, 32(12): 995-1002. doi: 10.1088/1674-1137/32/12/011
[7]	HUANG Wen-Xue , XIAO Guo-Qing , WANG Yue , TIAN Yu-Lin , ZHU Zhi-Chao , XU Hu-Shan , ZHAN Wen-Long . High precision mass measurement and LPT. Chinese Physics C, 2008, 32(S2): 197-200.
[8]	PEI Guo-Xi , SUN Yao-Lin , LIU Jin-Tong , CHI Yun-Long , LIU Yu-Cheng , LIU Nian-Zong . BEPCⅡ Positron Source. Chinese Physics C, 2006, 30(1): 66-70.
[9]	LIU Bo , GU Meng-Ping , CHi-Yun-Long , YANG Xing-Wang , TIAN Shuang-Min . Study on BEPC Experimental Electron Gun System. Chinese Physics C, 2005, 29(5): 507-511.
[10]	Ma Boqiang . High Precision Test of QCD at Beijing Electron Positron Collider. Chinese Physics C, 1999, 23(9): 922-925.
[11]	Guo Zhiyuan , Qin Qing , Zhang Chuang . A Study on Bunch Lengthening in the Beijing Electron-Positron Collider. Chinese Physics C, 1996, 20(S4): 403-410.
[12]	He Yuanjin , Xin Mingrui , Zhang Tianbao . Measurement of Characteristic Positron Annihilation Lifetime in HgCdTe. Chinese Physics C, 1994, 18(S3): 315-319.
[13]	Rong Gang , Ma Jimao , Mao Huishun , Wang Tajie , Bai Jingzhi , Li Weiguo . Application of dE/dr Method for e/π Identification of the Measurement of the Mass of τ Heavy Lepton by BES. Chinese Physics C, 1993, 17(S3): 215-224.
[14]	Wu Jimin , He Zhuoxiu . The Implications of the New Measurement of Lepton τ Mass. Chinese Physics C, 1993, 17(S2): 125-131.
[15]	BES Collaboration . τ Mass Measurement at Beijing Electron Positron Collider (BEPC). Chinese Physics C, 1992, 16(10): 865-875.
[16]	Liu Nianzong , Zhang Caidi , Zheng Linsheng , Hu Lidong , Zhao Xiaojian , Zhong Xuechu , Deng Hu , Zhu Shangen , Zhang Ge , Zhang Zhuxiang , Zhang Liangsheng , Zhou Yongshen , Xu Jianguo , Tan Yiping , Han Shurong , Han Ying , Bao Xiumin . Test Beam on the Beijing Electron Positron Collider (BEPC) and Physics Work on It. Chinese Physics C, 1992, 16(S4): 355-366.
[17]	LI Jin , MAO Ze-Pu . The Measurement of Bunch Length of Beijing Electron Positron Collider. Chinese Physics C, 1991, 15(5): 385-390.
[18]	Li Jin , Mao Zepu . Measurement of the Bunch Length of Beijing Electron Positron Collider. Chinese Physics C, 1991, 15(S3): 219-225.
[19]	PEI Guo-Xi , XIE Jia-Lin , ZHOU Shu , SUN Song-Lan . OPTIMIZATION OF BEPC POSITRON SOURCE. Chinese Physics C, 1990, 14(2): 110-117.
[20]	Pei Guoxi , Xie Jialin , Zhou Shu , Sun Songlan . Optimization of the BEPC Positron Source. Chinese Physics C, 1990, 14(S2): 125-134.

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BES Collaboration. Experimental Measurement of the Mass of the τ Lepton at the Beijing Electron Positron Collider (BEPC)[J]. Chinese Physics C, 1992, 16(S4): 343-354.

BES Collaboration. Experimental Measurement of the Mass of the τ Lepton at the Beijing Electron Positron Collider (BEPC)[J]. Chinese Physics C, 1992, 16(S4): 343-354. shu

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Received: 1992-04-20

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沈阳化工大学材料科学与工程学院沈阳 110142

Experimental Measurement of the Mass of the τ Lepton at the Beijing Electron Positron Collider (BEPC)

BES Collaboration

Received Date: 1992-04-20

Abstract: The τ lepton mass was measured with the data taken by the Beijing spectrometer (BES) at the BEPC at the Institute of High Energy Physics in Beijing. Approximately 5000 nb^-1 integrated luminosity was accumulated. Pairs of τ lepton produced near the threshold have been studied in eμ final states. The maximum likelihood method was used for both of predicting a sequence of experimental energies to approach the threshold and data fitting. The measurement yields the τ mass of 1776.9_-0.5^+0.4 ±02 MeV.