The strong coupling constant alpha_S is the least well known of all constants of nature, which play a role in the Standard Model (SM) of
particle physics and related fields such as cosmology and astrophysics. For many searches for new physics beyond the SM as well as for some important precision tests of the SM using collider data the uncertainty on the value of 𝛼𝑆 is a limiting factor. In recent years progress in theoretical predictions of Quantum Chromodynamics (QCD), and the availability of collider data at the highest energies has led to many improved determinations of alpha_S. The current world average quotes an uncertainty of less than 1%. However, there are noticeable discrepancies between different categories of
determinations of alpha_S, which may limit the ultimate precision of future world averages. We plan to bring together in this workshop the
leading experts on determinations of alpha_S from theory and experiment and all important categories. With presentations of the latest results and intense discussion by all participants we will focus on a global view of advantages and problems of each method.
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