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SLAC-PUB-7879
An Improved Inclusive Measurement of Ac Using the SLD Detector

Abstract

We report a new measurement of Ac using data obtained by SLD in 1993-97. This measurement uses a vertex tag technique, where the selection of a c hemisphere is based on the reconstructed mass of the charm hadron decay vertex. The method uses the 3D vertexing capabilities of SLD's CCD vertex detector and the small and stable SLC beams to obtain a high c-event tagging efficiency and purity of 28% and 81%, respectively. Charged kaons identified by the CRID detector and the charge of the reconstructed vertex provide an efficient quark-antiquark tag. We obtain a preliminary result of Ac=0.650+/-0.041+/-0.033.

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