Experimental Determination of the QCD Effective Charge αg1(Q)

被引：24
作者：
Deur, Alexandre [1 ,2 ]
Burkert, Volker [1 ]
Chen, Jian-Ping [1 ]
Korsch, Wolfgang [3 ]
机构：
[1] Thomas Jefferson Natl Accelerator Facil, Phys Div, Newport News, VA 23606 USA
[2] Univ Virginia, Dept Phys, Charlottesville, VA 22904 USA
[3] Univ Kentucky, Dept Phys & Astron, Lexington, KY 40506 USA
来源：
PARTICLES | 2022年 / 5卷 / 02期
关键词：
strong interaction; QCD; nonperturbative; running coupling constant; hadrons; nucleon; spin structure; DEPENDENT STRUCTURE-FUNCTION; SUM-RULES; SCATTERING; DYNAMICS; ALGEBRA; SCALE;
D O I：
10.3390/particles5020015
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The QCD effective charge alpha(g1)(Q) is an observable that characterizes the magnitude of the strong interaction. At high momentum Q, it coincides with the QCD running coupling alpha(s)(Q). At low Q, it offers a nonperturbative definition of the running coupling. We have extracted alpha(g1)(Q) from measurements carried out at Jefferson Lab that span the very low to moderately high Q domain, 0.14 <= Q <= 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(g1)(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.
引用
收藏
页码：171 / 179
页数：9
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