Measurement of the Parity-Violation Parameter $A_{b}$ from the Left-Right Forward-Backward Asymmetry of $b$ Quark Production in $Z^{0}$ Decays Using a Momentum-Weighted Track-Charge Technique

Publisher Website

10 April 1995

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 74 (15) , 2890-2894
https://doi.org/10.1103/physrevlett.74.2890

Abstract

Using an impact parameter tag to select an enriched sample of

Z^{0} \to b \bar{b}

events, and the net momentum-weighted track charge to identify the sign of the charge of the underlying

b

quark, we have measured the left-right forward-backward asymmetry for

b

quark production as a function of polar angle. Based on

1.8 {pb}^{- 1}

of

Z^{0}

decay data produced with a mean electron beam polarization of

P_{e} = 63 %

, this yields a direct measurement of the extent of parity violation in the

Zbb

coupling of

A_{b} = 0.87 \pm 0.11 (stat) \pm 0.09 (syst)

.

Keywords

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