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SLAC-PUB-8195
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 (pi small, Greeks) in the decay of D*+--->D0pi small, Greeks+.The results of these two methods are combined to give
Ac = 0.688 ± 0.035(stat.)= 0.025(sys.) (preliminary).

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