Jet physics in e+e- annihilation from 14 to 209 GeV
S. Kluth
Abstract
Results from the study of jets in hadronic final states produced in e+e- annihilation at sqrt(s)=14 to 209 GeV are discussed. Precise measurements of the strong coupling alphaS at many points of sqrt(s) provide convincing evidence for the running of alphaS as expected by QCD. Several measurements of the running b-quark mass mb(MZ) are combined yielding mb(MZ)=(2.92+-0.03(stat.)+-0.31(syst.)) GeV and compared with low energy results. Strong evidence for the running of the b-quark mass is found. Experimental investigations of the gauge structure of QCD are reviewed and then combined with the results for the colour factors CA=2.89+-0.01(stat.)+- 0.21(syst.) and CF=1.30+-0.01(stat.)+-0.09(syst.) and correlation coefficient rho=0.82. The uncertainties on the colour factors are below 10% and the agreement with the QCD expectation CA=3 and CF=4/3 is excellent.
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