1999/05/22 by M. Iwasaki, Masako Iwasaki, Iwasaki, Masako +2
Computer Science · Physics and Astronomy · #Computational Physics and Python Applications #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex
paper · pdf · doi:10.48550/arxiv.hep-ex/9905040
10 pages 5 figures Latex, Contribution to DPF '99
arxiv created 1999/05/22 · openalex publication_date 1999/05/22 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We present measurements of Z0 to heavy-quark coupling electroweak parameters, Rb, Rc, and parity-violation parameter Ac, from SLD. The measurements are based on approximately 550k hadronic Z0 events collected in 1993-98. Obtained preliminary results of Rb and Rc measurements are Rb = 0.2159 ± 0.0014 ± 0.0014 and Rc = 0.1685 ± 0.0047 ± 0.0043. In the Ac measurement, we use four methods to determine the initial-quark charge: combined Kaon charge and Vertex charge, lepton, exclusively reconstructed D*, D-mesons, and a new method using inclusive soft-pion from D*. The preliminary results of these four methods were combined to give Ac = 0.634 ± 0.027.