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A Preliminary Measurement of Rc Using the SLD Detector

We report a new measurement of R{sub c} using data obtained with the SLD detector in 1993-1996. This measurement uses a double tag technique, where the selection of a c hemisphere is based on the reconstructed mass of the charm hadron decay vertex. The method utilizes the 3D vertexing capabilities of SLD's CCD vertex detectors and the small and stable SLC beams to obtain a high c-tagging efficiency and purity of 14% and 68%, respectively. We obtain a preliminary combined 93-96 result of R{sub c} = 0.181 {+-} 0.012{sub stat.} {+-} 0.008{sub syst.}.