| Article | |
| Report number | arXiv:2203.08271 ; FERMILAB-CONF-22-148-T |
| Title | The strong coupling constant: State of the art and the decade ahead |
| Author(s) | d'Enterria, D. (CERN) ; Kluth, S. (Munich, Max Planck Inst.) ; Zanderighi, G. (Munich, Max Planck Inst.) ; Ayala, C. (Tarapaca U.) ; Benitez-Rathgeb, M.A. (Vienna U.) ; Bluemlein, J. (DESY, Zeuthen) ; Boito, D. (Vienna U. ; Sao Paulo U.) ; Brambilla, N. (Munich, Tech. U.) ; Britzger, D. (Munich, Max Planck Inst.) ; Camarda, S. (CERN) ; Cooper-Sarkar, A.M. (Oxford U.) ; Cridge, T. (University Coll. London) ; Cvetic, G. (CCTVal, Valparaiso) ; Brida, M. Dalla (CERN) ; Deur, A. (Jefferson Lab) ; Giuli, F. (CERN) ; Golterman, M. (San Francisco State U. ; Barcelona, Autonoma U.) ; Hoang, A.H. (Vienna U. ; U. Vienna (main)) ; Huston, J. (Michigan State U., East Lansing (main)) ; Jamin, M. (Vienna U. ; Heidelberg University,) ; Kotikov, A.V. (Dubna, JINR) ; Krivokhizhin, V.G. (Dubna, JINR) ; Kronfeld, A.S. (Fermilab) ; Leino, V. (Munich, Tech. U.) ; Lipka, K. (DESY, Zeuthen) ; Makela, T. (DESY, Zeuthen) ; Malaescu, B. (Paris U., VI-VII) ; Maltman, K. (York U., Canada ; Adelaide U.) ; Marzani, S. (Genoa U.) ; Mateu, V. (Salamanca U., IUFFyM ; CSIC, Madrid) ; Moch, S. (Hamburg U., Inst. Exp. Phys. II) ; Monni, P.F. (CERN) ; Nadolsky, P. (Southern Methodist U.) ; Nason, P. (Munich, Max Planck Inst. ; Milan Bicocca U.) ; Nesterenko, A.V. (Dubna, JINR) ; Perez-Ramos, R. (IPSA, Paris ; Paris, LPTHE) ; Peris, S. (Barcelona, IFAE) ; Petreczky, P. (Brookhaven) ; Pich, A. (Valencia U., IFIC) ; Rabbertz, K. (KIT, Karlsruhe, IAP) ; Ramos, A. (Valencia U., IFIC) ; Reichelt, D. (Durham U.) ; Rodriguez-Sanchez, A. (IJCLab, Orsay) ; Rojo, J. (Amsterdam U. ; Nikhef, Amsterdam) ; Saragnese, M. (DESY, Zeuthen) ; Sawyer, L. (Louisiana Tech. U., Ruston) ; Schott, M. (Mainz U.) ; Schumann, S. (Gottingen U.) ; Shaikhatdenov, B.G. (Dubna, JINR) ; Sint, S. (Trinity Coll., Dublin) ; Soyez, G. (IPhT, Saclay) ; Teca, D. (CCTVal, Valparaiso) ; Vairo, A. (Munich, Tech. U.) ; Vos, M. (Valencia U., IFIC) ; Waits, C. (Louisiana Tech. U., Ruston) ; Weber, J.H. (Humboldt U., Berlin) ; Wobisch, M. (Louisiana Tech. U., Ruston) ; Xie, K. (Pittsburgh U.) |
| Publication | 2024-10-28 |
| Imprint | 2022-03-15 |
| Number of pages | 163 |
| Note | 135 pages, 45 figures. White paper for the "Energy Frontier Proceedings of the US Community Study on the Future of Particle Physics" (Snowmass 2021). Matches JPG published version |
| In: | J. Phys. G 51, 9 (2024) pp.090501 |
| In: | 2021 Snowmass Summer Study, Seattle, WA, United States, 11 - 20 July 2021, pp.090501 |
| DOI | 10.1088/1361-6471/ad1a78 |
| Subject category | hep-lat ; Particle Physics - Lattice ; hep-ex ; Particle Physics - Experiment ; hep-ph ; Particle Physics - Phenomenology |
| Abstract | Theoretical predictions for particle production cross sections and decays at colliders rely heavily on perturbative Quantum Chromodynamics (QCD) calculations, expressed as an expansion in powers of the strong coupling constant $\alpha_s$. The current $\mathcal{O}(1\%)$ uncertainty of the QCD coupling evaluated at the reference Z boson mass, $\alpha_s(m_Z) = 0.1179 \pm 0.0009$, is one of the limiting factors to more precisely describe multiple processes at current and future colliders. A reduction of this uncertainty is thus a prerequisite to perform precision tests of the Standard Model as well as searches for new physics. This report provides a comprehensive summary of the state-of-the-art, challenges, and prospects in the experimental and theoretical study of the strong coupling. The current $\alpha_s(m_Z)$ world average is derived from a combination of seven categories of observables: (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. We review the current status of each of these seven $\alpha_s(m_Z)$ extraction methods, discuss novel $\alpha_s$ determinations, and examine the averaging method used to obtain the world-average value. Each of the methods discussed provides a ``wish list'' of experimental and theoretical developments required in order to achieve the goal of a per-mille precision on $\alpha_s(m_Z)$ within the next decade. |
| Copyright/License | preprint: (License: CC BY-NC-ND 4.0) publication: © 2024 The Author(s) (License: CC-BY-4.0) |
Corresponding record in: Inspire
Record created 2022-04-12, last modified 2024-12-05