Mainz 2004 – scientific programme
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T: Teilchenphysik
T 307: QCD III
T 307.2: Talk
Tuesday, March 30, 2004, 16:15–16:30, RW 5
Measurement of αs with 4-Jet Events — •Jochen Schieck, Siegfried Bethke, Stefan Kluth, and Christoph Pahl — Max-Planck-Institut für Physik, Föhringer Ring 6, 80805 München
Hadronic final states in e+e− annihilation are studied with event shape observables which are sensitive to configurations with at least four hard partons. We use data from the OPAL experiment ranging from √s=91 to 200 GeV. NLO and NLLA calcultions for the 4-Jet Rate from perturbative QCD are used to deterimine αs, the coupling constant of QCD.