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利用L3合作组1992年和1993年的数据，通过τ→a1v→π±π0π0v道测量了由Z0衰变的τ的极化不对称性A(pol)＝－0．239±0．126±0．100，其中第一项误差为统计误差，第二项误差为系统误差．由此推断有效电弱混合角sin2θw＝0．2197±0．0219．
Using the 1992 and 1993 data of the L3 cooperative group, the polarization asymmetry of τ of Z0 decayed by τ → a1v → π ± π0π0v was measured as A (pol) = - 0.239 ± 0.126 ± 0. 100, of which the first error is the statistical error, the second error is the systematic error. From this we can infer the effective electric weak mixing angle sin2θw = 0.2197 ± 0.0219.