Abstract

This paper presents measurements of the leptonic asymmetries in Z{sup 0} decays measured with the SLD detector at the SLAC Linear Collider. A data sample of approximately 500,000 Z{sup 0} boson decays has been used. These measurements lead to a precise determination of the effective weak mixing angle sin{sup 2} {theta}{sub w}{sup eff}. The combined preliminary result is sin{sup 2} {theta}{sub w}{sup eff} = 0.23110 {+-} 0.00029.

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