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General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. We present a study of jet multiplicities based on 37 000 hadronic Z ° boson decays. From this data we determine the strong X +0,012 coupling constant oq = 0.115 + 0.005 (e p. ) -O.OLO (theor.) to second order QCD at x/s = 91.22 GeV.

General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. We have measured the properties of Z°--,bl] decays using a sample of 944 inclusive muon events, corresponding to 18000 hadron events obtained with the L3 detector at LEP. We measured the partial decay width of the Z ° into bb, Fb6 = 353 _+ 48 MeV, and we determined the vector coupling of the Z ° to the b quark; g~,(b)=0.095 _+ 0.047. We measured the forward-backward charge asymmetry in e + e-~bl~ events at ,,/s ~ Mz, and obtained Ab~ = 13.3 _+ 9.9%.