Improved Direct Measurement Of Leptonic Coupling Asymmetries With Polarized Z Bosons

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PHYSICAL REVIEW LETTERS（2001）

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摘要

We present final measurements of the Z boson-lepton coupling asymmetry parameters A(e), A(mu), and A(tau) with the complete sample of polarized Z bosons collected by the SLD detector at the SLAG Linear Collider. From the left-right production and decay polar angle asymmetries in leptonic Z decays we measure A(e) = 0.1544 +/- 0.0060, A(mu) = 0.142 +/- 0.015, and A(tau) = 0.136 +/- 0.015. Combined with our left- right asymmetry measured from hadronic decays, we find A(e) = 0.1516 +/- 0.0021. Assuming lepton universality, we obtain a combined effective weak mixing angle of sin(2)theta (eff)(W) = 0.230 98 +/- 0.000 26.

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elementary particles

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