Measurement of the Polarized Forward-Backward Asymmetry of Z0 bb Using a Lifetime Tag and Momentum-Weighted Track Charge
- SLAC
We present a direct measurement of the parity violating parameter A{sub b} by analyzing the left right forward backward asymmetry of b quarks in e{sup +}e{sup -} {yields} Z{sup 0} {yields} b{bar b}. The SLD experiment observes hadronic decays of Z{sup 0} bosons produced at resonance in collisions of longitudinally polarized electrons and unpolarized positrons at the SLC. Heavy flavor decays of the Z{sup 0} are identified by using the topologically reconstructed mass of B hadrons. The asymmetry A{sub b} is measured with a self calibrating technique employing momentum weighted track charge from both hemispheres in the tagged events. From our 1994-1995 sample of 3.6 pb{sup -1} of e{sup +}e{sup -} annihilation data with a luminosity weighted average e{sup -} polarization of 77%, and our 1993 sample of 1.8 pb{sup -1} with a luminosity-weighted polarization of 63%, we obtain A{sub b} = 0.911 {+-} 0.045(stat.) {+-} 0.045(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:
- 826629
- Report Number(s):
- SLAC-PUB-7629
- Country of Publication:
- United States
- Language:
- English
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