Improved Direct Measurement of Ab with the SLD Detector Using a Mass Tag and Momentum-Weighted Track Charge
- SLAC
We present an improved direct measurement of the parity-violation parameter A{sub b} in the Z boson-b quark coupling using a self-calibrating track-charge technique applied to a sample enriched in Z {yields} b{bar b} events via the topological reconstruction of the B hadron mass. Manipulation of the SLC electron-beam polarization permits the measurement of A{sub b} to be made independently of other Z-pole coupling parameters. From the 1996-98 sample of 400,000 hadronic Z decays,produced with an average beam polarization of 73.4%, we find A{sub b} = 0.906 {+-} 0.022(stat.) {+-} 0.023(syst.).
- Research Organization:
- Stanford Linear Accelerator Center, Menlo Park, CA (US)
- Sponsoring Organization:
- USDOE Office of Science (US)
- DOE Contract Number:
- AC03-76SF00515;
- OSTI ID:
- 801773
- Report Number(s):
- SLAC-PUB-9188
- Country of Publication:
- United States
- Language:
- English
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