ScholarWorks@UMass Amherst

Title

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

Authors

The SLD Collaboration

Publication Date

2000

Journal or Book Title

Physical Review Letters

Abstract

We present the first direct measurement of A_s, 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 A_s=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.

DOI

https://doi.org/10.1103/PhysRevLett.85.5059

Pages

5059-5063

Volume

85

Issue

24

Recommended Citation

The SLD Collaboration, "First direct measurement of the parity-violating coupling of the Z(0) to the s quark" (2000). Physical Review Letters. 486.
https://doi.org/10.1103/PhysRevLett.85.5059