Direct Measurements of A_b and A_c using Vertex/Kaon Charge Tags at SLD
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.).
Keywords
Cite
@article{arxiv.hep-ex/0410042,
title = {Direct Measurements of A_b and A_c using Vertex/Kaon Charge Tags at SLD},
author = {SLD Collaboration and K. Abe},
journal= {arXiv preprint arXiv:hep-ex/0410042},
year = {2008}
}
Comments
11 pages, 2 figures, 2 tables, to be submitted to Physical Review Letters; version 2 reflects changes suggested by the referee