Measurement of Ac with Charmed Mesons at SLD
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We present a direct measurement of the Z0 to cc-bar coupling
parity-violation parameter Ac with the SLD detector.
The measurement is based on the entire SLD data sample of 530k 
hadronic Z0 decays, produced with a mean electron-beam polarization 
of Pe = 73%. The tagging of c-quark events was performed using 
two methods: the exclusive reconstruction of D*+, D+, and D0 mesons, 
and the inclusive PT spectrum of soft-pions (pi_s) in the decay of 
D*+ -> D0 pi_s+. The combination of these two methods yields a 
precision of +-0.040.