The left-right asymmetry for b quarks, Ab, is precisely predicted by the Weinberg-Salam-Glashow model of particle interactions, now the standard model for high-energy particle physics. As a test of this model, Ab is directly measured at the SLC Large Detector (SLD) by taking advantage of the unique polarized electron beam at the Stanford Linear Collider (SLC) and measuring the left-right forward-backward asymmetry of 6 quarks. To measure the asymmetry, b quarks are identified using muons of

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... total and transverse momenta. The result for the 1993 data sample of 37,643 hadronic 2s is Ab = 0.91 f 0.19 2 0.06, where the first error is statistical and the second systematic. This result is in agreement with the standard model prediction ofAb = 0.935.