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SLAC-PUB-8618
An Improved Direct Measurement of Leptonic Coupling Asymmetries with Polarized Z Bosons

Abstract

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 SLAC 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 sin²theta_w^eff = 0.23098±0.00026.

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