Measurements of Parity-Violation Parameters at SLD

TL;DR

This paper reports precise measurements of parity-violation parameters for bottom, charm, and strange quarks at the Z^0 resonance using data from the SLD detector, providing important tests of the Standard Model.

Contribution

It presents the first direct measurements of $A_b$, $A_c$, and $A_s$ at the Z^0 resonance with high statistical precision from SLD data collected over several years.

Findings

Measured $A_b = 0.914\pm0.024$

Measured $A_c = 0.635\pm0.027$

Measured $A_s = 0.895\pm0.066(stat.)\pm 0.062(sys.)$

Abstract

We present direct measurements of the parity-violation parameters $A_b$, $A_c$, and $A_s$ at the $Z^0$ resonance with the SLD detector. The measurements are based on approximately 530k hadronic $Z^0$ events collected in 1993-98. Obtained results are $A_b = 0.914\pm0.024$ (SLD combined: preliminary), $A_c = 0.635\pm0.027$ (SLD combined: preliminary), and $A_s = 0.895\pm0.066(stat.)\pm 0.062(sys.)$.