Measurement of Ac with charmed mesons at SLD
Abstract
We present a direct measurement of the parity-violation parameter Ac. The measurement is based on 550k Z0 decays collected by the SLD detector. The mean electron-beam polarization is |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 (pis) in the decay of D*+ -> D0 pis+. The results of these two methods are combined to give Ac = 0.688 +- 0.035(stat.) +- 0.025(sys.) (preliminary).
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