Precise perturbative predictions from fixed-order calculations

作者：Yan Jiang, Zhi-Fei Wu, Jian-Ming Shen, Xing-Gang Wu · 发表于：Journal of Physics G Nuclear and Particle Physics · 年份：2023 · DOI：10.1088/1361-6471/acb281 · 被引用次数：13 · 研究领域：Particle physics theoretical and experimental studies、Quantum Chromodynamics and Particle Interactions、High-Energy Particle Collisions Research

Abstract The intrinsic conformality (iCF) is a general property of the renormalizable gauge theory, which ensures the scale invariance of a fixed-order series at each perturbative order. Following the idea of iCF, we suggest a novel single-scale setting approach under the principle of maximum conformality (PMC) with the purpose of removing the conventional renormalization scheme and scale ambiguities. We call this newly suggested single-scale procedure the PMC ∞ -s approach, in which an overall effective α s , and hence an overall effective scale is achieved by identifying the { β 0 } terms at each order. Its resultant conformal series is scale-invariant and satisfies all renormalization group requirements. The PMC ∞ -s approach is applicable to any perturbatively calculable observable, and its resultant perturbative series provides an accurate basis for estimating the contribution from the unknown higher-order (UHO) terms. Using the Higgs decay into two gluons up to five-loop quantum chromondynamics (QCD) corrections as an example, we show how the PMC ∞ -s works, and we obtain Γ H PMC ∞ − s PAA = 334.45 − 7.03 + 7.07 KeV and Γ H PMC ∞ − s B . A . = 334.45 − 6.29 + 6.34 KeV . Here the errors are squared averages of those mentioned in the body of the text. The Pad e ...