Measurement of the polarized forward-backward asymmetry of b quarks at SLD
This thesis presents a direct measurement of the parity-violating parameter A{sub b} using the Left-Right Forward-Backward asymmetry of b{anti b} pair production at the Z{sup 0} pole. The measurement was done at the Stanford Linear Accelerator Center (SLAC) using data from the SLAC Large Detector (SLD). The authors take advantage of the high polarization of the SLAC Linear Collider (SLC) electron beam. To identify heavy flavor decays of the Z{sup 0}, they use a b-tag based on the topological reconstruction of the mass of the B vertex. Discrimination between the b and {anti b} quark directions is provided by a self-calibrating jet-charge technique. This technique allows calibration of the analyzing power from data and gives a much reduced model dependence. Based on the 1994--95 (1993) sample of 100,000 (50,000) Z{sup 0} decays recorded with an electron beam polarization of <P{sub e}> = 77% (63%), they have obtained A{sub b} = 0.911 {+-} 0.045(stat) {+-} 0.045(syst). This value is in goo d agreement with the Standard Model.
- Research Organization:
- Stanford Univ., Stanford Linear Accelerator Center, CA (US)
- Sponsoring Organization:
- USDOE Office of Energy Research, Washington, DC (US)
- DOE Contract Number:
- AC03-76SF00515
- OSTI ID:
- 296741
- Report Number(s):
- SLAC-R-510; ON: DE98059287; TRN: US200306%%87
- Resource Relation:
- Other Information: Supercedes report DE98059287; DN: Thesis submitted to the Univ. of Wisconsin, Madison, WI (US); TH: Thesis (Ph.D.); PBD: Jul 1997; PBD: 1 Jul 1997
- Country of Publication:
- United States
- Language:
- English
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