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

BES Collaboration

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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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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[2]	Sneha Pradhan , S. K. Maurya , A. Errehymy , G. Mustafa , P.K. Sahoo . Gravitationally deformed polytropic models in extended teleparallel gravity and influence of decoupling parameters on constraining mass-radius relation. Chinese Physics C, 2025, 49(10): 105110. doi: 10.1088/1674-1137/ade4a1
[3]	Xiaoxuan Lin , Wei Kou , Shixin Fu , Rong Wang , Chengdong Han , Xurong Chen . Revisiting the deuteron mass radius via near-threshold ρ⁰, ω, and ϕ meson photoproduction. Chinese Physics C, 2025, 49(10): 103105. doi: 10.1088/1674-1137/ade1c9
[4]	Shuang Qu , Jin-Yan Zhang , Man Bao . Nuclear mass predictions with a Bayesian neural network. Chinese Physics C, 2025, 49(10): 104106. doi: 10.1088/1674-1137/ade958
[5]	Yi Wei Hao , Yi Fei Niu , Zhong Ming Niu . The Role of Fission in Mass Sensitivity Study of the r-process. Chinese Physics C, 2025, 49(): 1-7. doi: 10.1088/1674-1137/adfe55
[6]	. Search for the lepton number violation decay ω→π⁺π⁺e⁻e⁻+c.c.. Chinese Physics C, 2025, 49(10): 103002. doi: 10.1088/1674-1137/ade955
[7]	LIANG Jun , LIU Yan-Chun , ZHU Qiao . Thermodynamics of noncommutative geometry inspired black holes based on Maxwell-Boltzmann smeared mass distribution. Chinese Physics C, 2014, 38(2): 025101. doi: 10.1088/1674-1137/38/2/025101
[8]	HUANG Jiang , XIONG Yong-Qian , CHEN De-Zhi , LIU Kai-Feng , YANG Jun , LI Dong , YU Tiao-Qin , FAN Ming-Wu , YANG Bo . A permanent magnet electron beam spread system used fora low energy electron irradiation accelerator. Chinese Physics C, 2014, 38(10): 107008. doi: 10.1088/1674-1137/38/10/107008
[9]	YANG Hong-Xun (for the BESⅡ collaboration) . Partial wave analysis of J/ψ→ppπ⁰ and measurement of J/ψ→ppη, ppη´. Chinese Physics C, 2009, 33(12): 1331-1335. doi: 10.1088/1674-1137/33/12/048
[10]	HUANG Wen-Xue , WANG Yue , ZHU Zhi-Chao , TIAN Yu-Lin , XU Hu-Shan , SUN Zhi-Yu , XIAO Guo-Qing , ZHAN Wen-Long . Experimental Study of the High-Voltage Breakdown and Simulations for the RFQ Cooler and Buncher RFQ1L. Chinese Physics C, 2006, 30(S2): 261-264.
[11]	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.
[12]	BES Collaboration . Experimental Study of Resonance f₂(1270) in the J/ψ Hadronic Decay. Chinese Physics C, 1993, 17(2): 97-106.

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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.