First Direct Measurement of the Parity-Violating Coupling of the Z^0 to the s-Quark

Abstract

We have made the first direct measurement of the parity-violating coupling of the Z^0 boson to the strange quark, A_s, using ~550,000 e^+e^- ->Z^0->hadrons events produced with a polarized electron beam and recorded by the SLD experiment. Z^0 -> 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 K^0_s. From the polar angle distributions of the strangeness-signed thrust axis, we obtained A_s=0.895+-0.066(stat.)+-0.062(syst.). The analyzing power and u-ubar plus d-dbar background were constrained using the data.

10 pages, 1 figure. Submitted to Physical Review Letters

References in corpus (3)

• A High-Precision Measurement of the Left-Right Z Boson Cross-Section Asymmetry
• A Measurement of Rb using a Vertex Mass Tag
• Measurement of the Branching Fractions and Forward-Backward Asymmetries of the Z^0 into Light Quarks

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