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.

[1]	Jian-Yong Zhang , Xiao Cai , Xiao-Hu Mo , Di-Zhou Guo , Jian-Li Wang , Bai-Qi Liu , M. N. Achasov , A. A. Krasnov , N. Yu. Muchnoi , E. E. Pyata , E. V. Mamoshkina , F. A. Harris . Upgrade of beam energy measurement system at BEPC-Ⅱ. Chinese Physics C, 2016, 40(7): 076001. doi: 10.1088/1674-1137/40/7/076001
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[3]	JIA Han-Bing , MA Bo-Qiang . Mass effect in polarization investigation at BEPC/BES and the B-factory. Chinese Physics C, 2013, 37(1): 013102. doi: 10.1088/1674-1137/37/1/013102
[4]	F. P. An et al. (Daya Bay collaboration) . Improved measurement of electron antineutrino disappearance at Daya Bay. Chinese Physics C, 2013, 37(1): 011001. doi: 10.1088/1674-1137/37/1/011001
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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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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.