Direct measurements of A(b) and A(c) using vertex and kaon charge tags at the SLAC detector

Authors

K Abe
et. al.

Publication Date

2005

Journal or Book Title

Physical Review Letters

Abstract

Exploiting the manipulation of the SLC electron-beam polarization, we present precise direct measurements of the parity violation parameters A_c and A_b in the Z boson–c quark and Z boson–b quark coupling. Quark/antiquark discrimination is accomplished via a unique algorithm that takes advantage of the precise SLD CCD vertex detector, employing the net charge of displaced vertices as well as the charge of kaons that emanate from those vertices. From the 1996-98 sample of 400,000 Z decays, produced with an average beam polarization of 73.4%, we find A_c = 0.673±0.029(stat.) ± 0.023(syst.) and A_b = 0.919 ± 0.018(stat.) ± 0.017(syst.).

DOI

https://doi.org/10.1103/PhysRevLett.94.091801

Volume

94

Issue

9

Recommended Citation

Abe, K and al., et., "Direct measurements of A(b) and A(c) using vertex and kaon charge tags at the SLAC detector" (2005). Physical Review Letters. 472.
https://doi.org/10.1103/PhysRevLett.94.091801