Improved Direct Measurement of the Parity-Violation Parameter Ab Using a Mass Tag and Momentum-Weighted Track Charge

Kenji Abe et al. (SLD Collaboration)
Phys. Rev. Lett. 90, 141804 – Published 10 April 2003

Abstract

We present an improved direct measurement of the parity-violation parameter Ab in the Z boson–b-quark coupling using a self-calibrating track-charge technique applied to a sample enriched in Zbb¯ events via the topological reconstruction of the B hadron mass. Manipulation of the Stanford Linear Collider electron-beam polarization permits the measurement of Ab to be made independently of other Z-pole coupling parameters. From the 1996–1998 sample of 400 000 hadronic Z decays, produced with an average beam polarization of 73.4%, we find Ab=0.906±0.022(stat)±0.023(syst).

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  • Received 29 August 2002

DOI:https://doi.org/10.1103/PhysRevLett.90.141804

©2003 American Physical Society

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Vol. 90, Iss. 14 — 11 April 2003

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