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arXiv · 2410.06956

Updated Determination of Ellis-Jaffe Sum Rules up to $\rm N^{3}LO$ QCD corrections

Hua Zhou·Qing Yu·Xing-Gang Wu
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Abstract

In this paper, we explore the properties of the Ellis-Jaffe Sum Rule (EJSR) by employing the Principle of Maximum Conformality (PMC) approach to address its perturbative part up to next-to-next-to-next-to-leading order ($\rm N^{3}LO$) QCD contributions. By applying the PMC, we achieve a precise perturbative QCD prediction for the EJSR, free from conventional ambiguities associated with the renormalization scale choices. Considering the presence of the $α_s$ Landau pole near the asymptotic scale, we incorporate the low-energy $α_s$ model based on analytic perturbation theory (APT) to refine the EJSR behavior in the infrared region. By combining the PMC approach with the low-energy APT model, the agreement between theoretical calculations and experimental measurements of EJSR is significantly improved, as evidenced by the reduced discrepancy from $χ^{2}/d.o. f|_{\rm Conv.}=1.86$ to $χ^{2}/d.o. f|_{\rm PMC}=1.19$, thereby validating the effectiveness of our approach.

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Hua Zhou, Qing Yu, Xing-Gang Wu. 2025-05-30. Updated Determination of Ellis-Jaffe Sum Rules up to $\rm N^{3}LO$ QCD corrections. https://doi.org/10.1016/j.physletb.2025.139610

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