Measurements of Z{sup 0} to Heavy-quark couplings at SLD | Zendy

M. Iwasaki | Zendy

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Measurements of Z{sup 0} to Heavy-quark couplings at SLD

Author(s) -

M. Iwasaki

Publication year - 1999

Language(s) - English

Resource type - Reports

DOI - 10.2172/10090

Subject(s) - physics , hadron , particle physics , lepton , pion , meson , charge (physics) , vertex (graph theory) , quark , electroweak interaction , nuclear physics , b meson , coupling (piping) , electron , combinatorics , graph , mechanical engineering , mathematics , engineering

We present measurements of Z{sup 0} to heavy-quark coupling electroweak parameters, R{sub b}, R{sub c}, and parity-violation parameter A{sub c}, from SLD. The measurements are based on approximately 550k hadronic Z{sup 0} events collected in 1993-98. Obtained preliminary results of R{sub b} and R{sub c} measurements are R{sub b} = 0.2159 {+-} 0.0014 {+-} 0.0014 and R{sub c} = 0.1685 {+-} 0.0047 {+-} 0.0043. In the A{sub c} 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 A{sub c} = 0.634 {+-} 0.027

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