Chinese Physics C > 1998, Vol. 22 > Issue(11): 990-995

Measurement of the τ Polarization Asymmetry in τ→a₁v→π^±π⁰π⁰v Decay at Z⁰Peak

Institute of High Energy Physics. CAS, Beijing 100039

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Abstract：
The τ polarization asymmetry in τ→a ₁v→π ^±π ⁰π ⁰v decay at Z ⁰peak is measured using data collected by L3 detector at LEP in 1992 and 1993, A _pol=－0.239±0.126±0.100, where the first error is statistical and the second systematic. And the effective electroweak mixing angle sin ²θ _w=0.2197±0.0219 is derived.

References

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Liu Zhenan, Chen Guoming, Chen Hesheng and Tang Xiaowei. Measurement of the τ Polarization Asymmetry in τ→a ₁v→π ^±π ⁰π ⁰v Decay at Z ⁰Peak[J]. Chinese Physics C, 1998, 22(11): 990-995.

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Received: 1997-12-02
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Measurement of the τ Polarization Asymmetry in τ→a₁v→π^±π⁰π⁰v Decay at Z⁰Peak

Corresponding author:Liu Zhenan,

Institute of High Energy Physics. CAS, Beijing 100039

Received Date:1997-12-02
Accepted Date:1900-01-01
Available Online:1998-11-05

Abstract:The τ polarization asymmetry in τ→a₁v→π^±π⁰π⁰v decay at Z⁰peak is measured using data collected by L3 detector at LEP in 1992 and 1993, A_pol=－0.239±0.126±0.100, where the first error is statistical and the second systematic. And the effective electroweak mixing angle sin²θ_w=0.2197±0.0219 is derived.