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First direct measurement of the parity-violating coupling of the Z(0) to the s quark

Abstract
We present the first direct measurement of As, the parity-violating coupling of the Z0 boson to the strange quark, using ∼550000 e+e−→Z0→hadrons events recorded by the SLC Large Detector with a polarized e− beam. We tagged Z0→s¯s events by the absence of B or D hadrons and the presence in each hemisphere of a high momentum K± or K0s. Fitting the polar angle distributions of the strangeness-signed thrust axis gave As=0.895±0.066(stat)±0.062(syst). The analyzing power and uu+dd background were constrained using the data, greatly reducing any model dependence.
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2000-01-01
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