Direct Measurements of A_b and A_c using Vertex/Kaon Charge Tags at SLD

Details Direct Measurements of A_b and A_c using Vertex/Kaon Charge Tags at SLD Direct Measurements of A_b and A_c using Vertex/Kaon Charge Tags at SLD

2004-10-15

arxiv.org/abs/hep-ex/0410042v2

Phys.Rev.Lett.94:091801,2005

Physics

High Energy Physics

High Energy Physics - Experiment

11 pages, 2 figures, 2 tables, to be submitted to Physical Review Letters; version 2 reflects changes suggested by the referee

Scientific paper

10.1103/PhysRevLett.94.091801

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.).

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