The strong coupling constant

Author(s): C. Ayala, M. A. Benitez-Rathgeb, J. Blümlein, D. Boito, N. Brambilla, D. Britzger, S. Camarda, A. M. Cooper-Sarkar, T. Cridge, G. Cvetic, M. Dalla Brida, A. Deur, F. Giuli, M. Golterman, A. H. Hoang, J. Huston, M. Jamin, A. V. Kotikov, V. G. Krivokhizhin, A. S. Kronfeld, V. Leino, K. Lipka, T. Mäkelä, B. Malaescu, K. Maltman, S. Marzani, V. Mateu, S. Moch, P. F. Monni, P. Nadolsky, P. Nason, A. V. Nesterenko, R. Perez-Ramos, S. Peris, P. Petreczky, A. Pich, K. Rabbertz, A. Ramos, D. Reichelt, A. Rodriguez-Sanchez, J. Rojo, M. Saragnese, L. Sawyer, M. Schott, S. Schumann, B. G. Shaikhatdenov, S. Sint, G. Soyez, D. Teca, A. Vairo, M. Vos, C. Waits, J. H. Weber, M. Wobisch, K. Xie, Giulia Zanderighi
Abstract: This document provides a comprehensive summary of the state-of-the-art, challenges, and prospects in the experimental and theoretical study of the strong coupling $\alpha_s$. The current status of the seven methods presently used to determine $\alpha_s$ based on: (i) lattice QCD, (ii) hadronic $\tau$ decays, (iii) deep-inelastic scattering and parton distribution functions fits, (iv) electroweak boson decays, hadronic final-states in (v) e+e-, (vi) e-p, and (vii) p-p collisions, and (viii) quarkonia decays and masses, are reviewed. Novel $\alpha_s$ determinations are discussed, as well as the averaging method used to obtain the PDG world-average value at the reference Z boson mass scale, $\alpha_s(m^2_Z)$. Each of the extraction methods proposed provides a "wish list" of experimental and theoretical developments required in order to achieve an ideal permille precision on $\alpha_s(m^2_Z)$ within the next 10 years.
Organisation(s): Particle Physics, Research Platform Erwin Schrödinger International Institute for Mathematics and Physics
External organisation(s): Universität Wien, Scientific Software Center
No. of pages: 131
Publication date: 03-2022
Austrian Fields of Science 2012: 103012 High energy physics
Keywords
Portal url: https://ucris.univie.ac.at/portal/en/publications/the-strong-coupling-constant(759b5d0b-d569-4f1c-8db0-9a17b7c8e503).html