$α_s$ 2002

Details $α_s$ 2002 $α_s$ 2002

2002-11-05

arxiv.org/abs/hep-ex/0211012v1

Nucl.Phys.Proc.Suppl.121:74-81,2003

Physics

High Energy Physics

High Energy Physics - Experiment

Talk presented at the QCD 02 High-Energy Physics International Conference in Quantum Chromodynamics, Montpellier (France), Jul

Scientific paper

10.1016/S0920-5632(03)01817-6

An update of measurements of the strong coupling constant $\alpha_s$ is given, representing the status of September 2002. The results convincingly prove the energy dependence of $\alpha_s$ and are in excellent agreement with the expectations of Quantum Chromodynamics, QCD. Evolving all results to the rest energy of the $Z^0$ boson, the new world average of $\alpha_s(M_Z)$ is determined from measurements which are based on QCD calculations in complete NNLO perturbation theory, giving $$ \alpha_s(M_Z) = 0.1183 \pm 0.0027 . $$

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