α_s(2019): Precision measurements of the QCD coupling

David d'Enterria , Stefan Kluth (eds.) , S. Alekhin , P. A. Baikov , A. Banfi , F. Barreiro , A. Bazavov , S. Bethke

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J. Bl\"umlein D. Boito N. Brambilla D. Britzger S. J. Brodsky S. Camarda K. G. Chetyrkin D. d'Enterria M. Dalla Brida X. Garcia i Tormo M. Golterman R. Horsley J. Huston M. Jamin A. Kardos A. Keshavarzi S. Kluth J. K\"uhn K. Maltman R. Miravitllas S.-O. Moch P. F. Monni D. Nomura T. Onogi R. P\'erez-Ramos S. Peris P. Petreczky J. Pires A. Poldaru K. Rabbertz F. Ringer S. Sint R. Sommer G. Somogyi J. Soto Z. Sz\H{o}r H. Takaura T. Teubner Z. Tr\'ocs\'anyi Z. Tulip\'ant A. Vairo A. Verbytskyi J.H. Weber X. Weichen G. Zanderighi

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classification ✦ hep-ph hep-ex

keywords alphacouplinghadronicmeasurementsprecisionbosoncollisionsdecays

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This document collects a written summary of all contributions presented at the workshop "$\alpha_s$(2019): Precision measurements of the strong coupling" held at ECT* (Trento) in Feb. 11--15, 2019. The workshop explored in depth the latest developments on the determination of the QCD coupling $\alpha_s$ from the key categories where high precision measurements are available: (i) lattice QCD, (ii) hadronic $\tau$ decays, (iii) deep-inelastic scattering and parton distribution functions, (iv) event shapes, jet cross sections, and other hadronic final-states in $e^+e^-$ collisions, (v) Z boson and W boson hadronic decays, and (vi) hadronic final states in p-p collisions. The status of the current theoretical and experimental uncertainties associated to each extraction method, and future perspectives were thoroughly reviewed. Novel $\alpha_s$ determination approaches were discussed, as well as the combination method used to obtain a world-average value of the QCD coupling at the Z mass pole.

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α_s(2019): Precision measurements of the QCD coupling

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