First Direct Measurement of the Parity-Violating Coupling of the Z0 to the s-Quark
The SLD Collaboration
Abstract
We have made the first direct measurement of the parity-violating coupling of the Z0 boson to the strange quark, As, using ~550,000 e+e- ->Z0->hadrons events produced with a polarized electron beam and recorded by the SLD experiment. Z0 -> s-sbar events were tagged by the absence of B or D hadrons and the presence in each hemisphere of a high-momentum K+- or K0s. From the polar angle distributions of the strangeness-signed thrust axis, we obtained As=0.895+-0.066(stat.)+-0.062(syst.). The analyzing power and u-ubar plus d-dbar background were constrained using the data.
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