First Direct Measurement of the Parity-Violating Coupling of the Z{sup 0} to the s-Quark
- SLAC
The authors have made the first direct measurement of the parity-violating coupling of the Z{sup 0} boson to the strange quark, A{sub s}, using {approximately}550,000 e{sup +}e{sup {minus}} --> Z{sup 0} --> hadrons event produced with a polarized electron beam and recorded by the SLD experiment. Z{sup 0} s anti-s events were tagged by the absence of B or D hadrons and the presence in each hemisphere of a high-momentum K{sup {+-}} or K{sub s}{sup 0}. From the polar angle distributions of the strangeness-signed thrust axis, the authors obtained A{sub s} = 0.895{+-}0.066(stat.){+-}0.062(syst.). The analyzing power and u anti-u + d anti-d background were constrained using the data.
- Research Organization:
- Stanford Linear Accelerator Center, Menlo Park, CA (US)
- Sponsoring Organization:
- USDOE Office of Energy Research (ER) (US)
- DOE Contract Number:
- AC03-76SF00515
- OSTI ID:
- 763785
- Report Number(s):
- SLAC-PUB-8408
- Country of Publication:
- United States
- Language:
- English
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