Abstract
We present a direct measurement of the parity-violation parameter A{sub c} in the coupling of the Z{sup 0} to c-quarks with the SLD detector. The measurement is based on a sample of 530k hadronic Z{sup 0} decays, produced with a mean electron-beam polarization of |P{sub e}| = 73%. The tagging of c-quark events is performed using two methods: the exclusive reconstruction of D*{sup +}, D{sup +}, and D{sup 0} mesons, and the soft-pions ({pi}{sub s}) produced in the decay of D*{sup +} {yields} D{sup 0}{pi}{sub s}{sup +}. The large background from D mesons produced in B hadron decays is separated efficiently from the signal using precision vertex information. The combination of these two methods yields A{sub c} = 0:688 {+-} 0:041.
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