Direct Measurement of A_b using Charged Kaons at the SLD Detector

Details Direct Measurement of A_b using Charged Kaons at the SLD Detector Direct Measurement of A_b using Charged Kaons at the SLD Detector

1999-07-30

arxiv.org/abs/hep-ex/9907066v1

Physics

High Energy Physics

High Energy Physics - Experiment

10 pages, 2 figures. Paper contributed to EPS-HEP 99 and Lepton-Photon Symposium 1999

Scientific paper

We report a new measurement of A_b using data obtained by SLD in 1997-98. This measurement uses a vertex tag technique, where the selection of a b hemisphere is based on the reconstructed mass of the bottom 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 b-event tagging efficiency and purity of 78% and 97%, respectively. Charged kaons identified by the CRID detector provide an efficient quark-antiquark tag, with the analyzing power calibrated from the data. We obtain a preliminary result of A_b = 0.997 \pm 0.044 \pm 0.067

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