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.

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[14]	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.
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[16]	BES Collaboration . τ Mass Measurement at Beijing Electron Positron Collider (BEPC). Chinese Physics C, 1992, 16(10): 865-875.
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[19]	Li Jin , Mao Zepu . Measurement of the Bunch Length of Beijing Electron Positron Collider. Chinese Physics C, 1991, 15(S3): 219-225.
[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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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.