Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2006-06-15
Prog.Part.Nucl.Phys.58:351-386,2007
Physics
High Energy Physics
High Energy Physics - Experiment
38 pages, 18 figures
Scientific paper
10.1016/j.ppnp.2006.06.001
Quantum Chromodynamics (QCD), the gauge field theory of the Strong Interaction, has specific features, asymptotic freedom and confinement, which determine the behaviour of quarks and gluons in particle reactions at high and at low energy scales. QCD predicts that the strong coupling strength $\as$ decreases with increasing energy or momentum transfer, and vanishes at asymptotically high energies. In this review, the history and the status of experimental tests of asymptotic freedom are summarised. The world summary of measurements of $\as$ is updated, leading to an unambiguous verification of the running of $\as$ and of asymptotic freedom, in excellent agreement with the predictions of QCD. Averaging a set of measurements balanced between different particle processes and the available energy range, results in a new and improved world average of $\amz = 0.1189 \pm 0.0010 .$
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