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

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

2000-06-14

arxiv.org/abs/hep-ex/0006019v1

Phys.Rev.Lett.85:5059-5063,2000

Physics

High Energy Physics

High Energy Physics - Experiment

10 pages, 1 figure. Submitted to Physical Review Letters

Scientific paper

10.1103/PhysRevLett.85.5059

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.

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