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Measurement of Rb at SLD


We report a new measurement of $R_b = \Gamma_{Z^0 \to b\bar b}/ \Gamma_{Z^0 \to hadrons}$ using a double tag technique where the $b$ selection is based on topological reconstruction of the mass of the $B$-decay vertex. The measurement was performed using a sample of 150k hadronic $Z^0$ events collected with the SLD at the SLAC Linear Collider during the years 1993-1995. The method utilizes the 3-D vertexing abilities of the SLD CCD pixel vertex detector and the small stable SLC beams to obtain a high $b$ tagging efficiency of 37% for a purity of 97.2%. The high purity reduces the systematics introduced by charm contamination and correlations with $R_c$. We obtain a result of $R_b$ = 0.2176$\pm 0.0033_{stat.}\pm 0.0017_{syst.}\pm 0.0008_{R_c}$.

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