A Preliminary Measurement of Rb using the New SLD Vertex Detector
We report a new measurement of R{sub b} using data obtained during the 1996 SLD run. This measurement uses a double tag technique, where the selection of a b hemisphere is based on the reconstructed mass of the B hadron decay vertex. The method utilizes the 3D vertexing capabilities of SLD's new CCD vertex detector and the small and stable SLC beams to obtain a high b tagging efficiency and purity of 47.9% and 97.6%, respectively. We obtain a preliminary result of R{sub b} = 0.2101 {+-} 0.0034{sub stat.} {+-} 0.0022{sub syst.} {+-} 0.0003{sub R{sub c}} for 1996 data. With our previous measurement from1993-95 data, we obtain a combined preliminary 93-96 result of R{sub b} = 0.2124 {+-} 0.0024{sub stat.} {+-} 0.0017{sub syst.}.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (US)
- DOE Contract Number:
- AC03-76SF00515
- OSTI ID:
- 826626
- Report Number(s):
- SLAC-PUB-7585; TRN: US0403482
- Resource Relation:
- Other Information: PBD: 23 Jan 2004
- Country of Publication:
- United States
- Language:
- English
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