| THE PHYSICS OF ELEMENTARY PARTICLES AND FIELDS |
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Novel and Self-Consistency Analysis of the QCD Running Coupling $\alpha_{\rm s}(Q)$ in Both the Perturbative and Nonperturbative Domains |
| Qing Yu1,2, Hua Zhou1,2, Xu-Dong Huang1, Jian-Ming Shen3, and Xing-Gang Wu1* |
1Department of Physics, Chongqing Key Laboratory for Strongly Coupled Physics, Chongqing University, Chongqing 401331, China
2Department of Physics, Norwegian University of Science and Technology, Høgskoleringen 5, N-7491 Trondheim, Norway
3School of Physics and Electronics, Hunan University, Changsha 410082, China
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| Cite this article: |
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Qing Yu, Hua Zhou, Xu-Dong Huang et al 2022 Chin. Phys. Lett. 39 071201 |
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Abstract The quantum chromodynamics (QCD) coupling $\alpha_{\rm s}$ is the most important parameter for achieving precise QCD predictions. By using the well measured effective coupling $\alpha^{g_1}_{\rm s}(Q)$ defined from the Bjorken sum rules as a basis, we suggest a novel self-consistency way to fix the $\alpha_{\rm s}$ at all scales: The QCD light-front holographic model is adopted for its infrared behavior, and the fixed-order pQCD prediction under the principle of maximum conformality (PMC) is used for its high-energy behavior. Using the PMC scheme-and-scale independent perturbative series, and by transforming it into the one under the physical V scheme, we observe that a precise $\alpha_{\rm s}$ running behavior in both the perturbative and nonperturbative domains with a smooth transition from small to large scales can be achieved.
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Received: 27 May 2022
Express Letter
Published: 18 June 2022
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| PACS: |
12.38.Aw
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(General properties of QCD (dynamics, confinement, etc.))
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12.38.Bx
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(Perturbative calculations)
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