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Experimental determination of the QCD effective charge $\alpha_{g_1}(Q)$

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arxiv 2205.01169 v2 pith:55AHZXJZ submitted 2022-05-02 hep-ph hep-exnucl-ex

A. Deur , V. Burkert , J.P. Chen , W. Korsch This is my paper · ORCID
classification hep-phhep-exnucl-ex
keywords alphachargeeffectivecouplinghighrunningverybecomes
verification ladder T0 review T1 audit T2 compute T3 formal
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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.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Asymptotic gauge symmetry and UV extension of the nonperturbative coupling in holographic QCD

    hep-ph 2025-05 conditional novelty 6.0 of 10

    A holographic effective strong coupling with momentum-dependent confinement strength and ultraviolet boundary conditions reproduces alpha_s data at all scales and gives alpha_s(MZ) = 0.1161 +/- 0.0017.

  2. Insight on confinement from the QCD effective charge

    hep-ph 2026-07 conditional novelty 5.5 of 10

    Assigning the imaginary poles of α_g1 to parton propagators produces long-distance damping e^{-Λ_s|x|/√2}|x|^{-5/2+d_a}, interpreting confinement as Green's-function suppression.

  3. Flipped Rotating Axion Non-minimally Coupled to Gravity: Baryogenesis and Dark Matter

    hep-ph 2025-02 conditional novelty 4.0 of 10

    A rotating axion, kicked into motion by a sign flip in its gravitational effective potential during kination, can co-generate baryon asymmetry and dark matter in a Majoron seesaw model.

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