Measurement of Michel Parameter in τ Decay

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BES Collaborator. Measurement of Michel Parameter in τ Decay[J]. Chinese Physics C, 1998, 22(11): 961-968.
BES Collaborator. Measurement of Michel Parameter in τ Decay[J]. Chinese Physics C, 1998, 22(11): 961-968. shu
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Received: 1997-12-03
Revised: 1900-01-01
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Measurement of Michel Parameter in τ Decay

  • Institute of High Energy Physics, CAS, Beijing 100039

Abstract: We have analysed the e+e collision data collected with Beijing Spectrometer at the center-of-mass energy 4.03 GeV and selected e+e→τ±τ+→e±X+v's events, X± required as μ±、π± and ρ±. From fitting electron energy spectrum in τ→ev's decay, the measurement value of Michel parameter is given as ρτ→e=0.705, this result is in good agreement with the prediction of standrd Model.

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