Chin. Phys. Lett.  2022, Vol. 39 Issue (7): 071201    DOI: 10.1088/0256-307X/39/7/071201
THE PHYSICS OF ELEMENTARY PARTICLES AND FIELDS |
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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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.
Received: 27 May 2022      Express Letter Published: 18 June 2022
PACS:  12.38.Aw (General properties of QCD (dynamics, confinement, etc.))  
  12.38.Bx (Perturbative calculations)  
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http://cpl.iphy.ac.cn/10.1088/0256-307X/39/7/071201       OR      http://cpl.iphy.ac.cn/Y2022/V39/I7/071201
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Qing Yu
Hua Zhou
Xu-Dong Huang
Jian-Ming Shen
and Xing-Gang Wu
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