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High Energy Physics - Phenomenology

arXiv:2205.01169 (hep-ph)
[Submitted on 2 May 2022 (v1), last revised 30 May 2022 (this version, v2)]

Title:Experimental determination of the QCD effective charge $α_{g_1}(Q)$

Authors:A. Deur, V. Burkert, J.P. Chen, W. Korsch
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Abstract:The QCD effective charge $\alpha_{g_1}(Q)$ is an observable that characterizes the magnitude of the strong interaction. At high momentum $Q$, it coincides with the QCD running coupling $\alpha_{\rm s}(Q)$. At low $Q$, it offers a nonperturbative definition of the running coupling. We have extracted $\alpha_{g_1}(Q)$ from measurements carried out at Jefferson Lab that span the very low to moderately high $Q$ domain, $0.14 \leq Q \leq 2.18$ GeV. The precision of the new results is much improved over the previous extractions and the reach in $Q$ at the lower end is significantly expanded. The data show that $\alpha_{g_1}(Q)$ becomes $Q$-independent at very low $Q$. They compare well with two recent predictions of the QCD effective charge based on Dyson-Schwinger equations and on the AdS/CFT duality.
Comments: 16 pages, 1 figure. Published version. Prepared for the Special Issue of PARTICLES: "Strong Interactions in the Standard Model: Massless Bosons to Compact Stars"
Subjects: High Energy Physics - Phenomenology (hep-ph); High Energy Physics - Experiment (hep-ex); Nuclear Experiment (nucl-ex)
Report number: JLAB-PHY-22-3609
Cite as: arXiv:2205.01169 [hep-ph]
  (or arXiv:2205.01169v2 [hep-ph] for this version)
  https://doi.org/10.48550/arXiv.2205.01169
Journal reference: Particles 5(2), 171 (2022)
Related DOI: https://doi.org/10.3390/particles5020015

Submission history

From: Alexandre Deur [view email]
[v1] Mon, 2 May 2022 19:25:13 UTC (70 KB)
[v2] Mon, 30 May 2022 11:22:45 UTC (70 KB)
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