τ Mass Measurement at Beijing Electron Positron Collider (BEPC)

BES Collaboration

Chinese Physics C> 1992, Vol. 16> Issue(10) : 865-875

τ Mass Measurement at Beijing Electron Positron Collider (BEPC)

BES Collaboration

Institute of High Energy Physics,Acadamia Sinica,Beijing 100039

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Abstract：
The τ lepton mass was measured with data taken by the BES detector at BEPC collider at Institute of High Energy Physics in Beijing.Approximately 5000nb^－1 luminosity was accumulated.Pairs of τ lepton produced near the threshold have been studied in eμ final states.The likelihood method was used for both of predicting a series of experimental energy and data fitting.The measurement yields the τ mass to be 1776.9±0.4±0.2MeV.

References

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DELCO collaboration P. R. L. 41(1978), 13.SPEC collaboration P. L. 77B(1978), 331.DASP collaboration P. L. 73B(1978), 109.MARKII collaboration P. L. 109B (1982), 119.[2] Revie w of particle properties, P. L. B239(1990), 11. 2.[3] M. Voloshin, talk presented at 1989 SLAC Workshop on tau charm factory, SLAC-REP-343.[4] 王平，在τ实验巾的理论截面(BES内部报告，1991). (Internal Report of B ES, 1992),[5] E. A. Kuraev and V. S. Fadin, Sov. J. Nucl.. Phys., 41(1985), 466.[6] I. Jones; Likelihood Function Method in Tau Mass Experiment (Internal Report of BES, 1991).[7] M. H. Ye, Z. P. Zheng, Proccedings of Lepton-Photon Conference (1989), 122.[8] 李金，τ质量测量的实验方案(BES内部报告，1991)[9] F. Poter, The BES Strategy of Tau Mass Experiment (Internal Report of BES, 1991).[10] 漆纳丁，胡涛，马东红，李玉山，姜之进等，事例选择，本底的排斥，Monte Carlo模拟和τ侧量中LFF方法的应用(内部报告BES, 1992).

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BES Collaboration. τ Mass Measurement at Beijing Electron Positron Collider (BEPC)[J]. Chinese Physics C, 1992, 16(10): 865-875.

BES Collaboration. τ Mass Measurement at Beijing Electron Positron Collider (BEPC)[J]. Chinese Physics C, 1992, 16(10): 865-875. shu

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

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