The strong coupling constant: State of the art and the decade ahead

d'Enterria, D.; Rojo, J.; Brambilla, N.; Reichelt, D.; Jamin, M.; Maltman, K.; Sint, S.; Krivokhizhin, V. G.; Teca, D.; Britzger, D.; Cooper-Sarkar, A. M.; Cridge, T.; Marzani, S.; Kronfeld, A. S.; Rodriguez-Sanchez, A.; Giuli, F.; Monni, P. F.; Zanderighi, G.; Huston, J.; Schott, M.; Makela, T.; Cvetic, G.; Moch, S.; Nadolsky, P.; Bluemlein, J.; Wobisch, M.; Sawyer, L.; Saragnese, M.; Leino, V.; Xie, K.; Weber, J. H.; Golterman, M.; Hoang, A. H.; Benitez-Rathgeb, M. A.; Schumann, S.; Kluth, S.; Deur, A.; Kotikov, A. V.; Ayala, C.; Camarda, S.; Malaescu, B.; Brida, M. Dalla; Mateu, V.; Petreczky, P.; Lipka, K.; Peris, S.; Nason, P.; Boito, D.; Waits, C.; Perez-Ramos, R.; Shaikhatdenov, B. G.; Pich, A.; Vos, M.; Nesterenko, A. V.; Ramos, A.; Rabbertz, K.; Soyez, G.; Vairo, A.

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PUBDB-2022-01776

The strong coupling constant: State of the art and the decade ahead

d'Enterria, D. (Corresponding author) ; Kluth, S. ; Zanderighi, G. ; Ayala, C. ; Benitez-Rathgeb, M. A. ; Bluemlein, J.DESY* ; Boito, D. ; Brambilla, N. ; Britzger, D.Extern* ; Camarda, S. ; Cooper-Sarkar, A. M. ; Cridge, T. ; Cvetic, G. ; Brida, M. D.DESY* ; Deur, A. ; Giuli, F. ; Golterman, M. ; Hoang, A. H. ; Huston, J. ; Jamin, M. ; Kotikov, A. V. ; Krivokhizhin, V. G. ; Kronfeld, A. S.Extern* ; Leino, V. ; Lipka, K.DESY* ; Makela, T. ; Malaescu, B. ; Maltman, K. ; Marzani, S. ; Mateu, V. ; Moch, S.Extern* ; Monni, P. F. ; Nadolsky, P. ; Nason, P. ; Nesterenko, A. V. ; Perez-Ramos, R. ; Peris, S. ; Petreczky, P. ; Pich, A. ; Rabbertz, K. ; Ramos, A. ; Reichelt, D. ; Rodriguez-Sanchez, A. ; Rojo, J. ; Saragnese, M. ; Sawyer, L. ; Schott, M. ; Schumann, S. ; Shaikhatdenov, B. G. ; Sint, S. ; Soyez, G. ; Teca, D. ; Vairo, A. ; Vos, M.Extern* ; Waits, C. ; Weber, J. H. ; Wobisch, M. ; Xie, K.

2022

130 pp. (2022) [10.3204/PUBDB-2022-01776]

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Please use a persistent id in citations: doi:10.3204/PUBDB-2022-01776

Report No.: FERMILAB-CONF-22-148-T; arXiv:2203.08271

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.

Keyword(s): parton: distribution function ; Z0: mass ; mass: scale ; final state: hadronic ; strong interaction: coupling constant ; p p: scattering ; electron p: scattering ; quarkonium: decay ; strong coupling ; deep inelastic scattering ; electroweak interaction ; lattice field theory

Note: 130 pages, 82 figures. White paper submitted to the Energy Frontier 'Proceedings of the US Community Study on the Future of Particle Physics' (Snowmass 2021)

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