论文标题
QCD有效电荷的实验确定$α_{g_1}（q）$
Experimental determination of the QCD effective charge $α_{g_1}(Q)$
论文作者
论文摘要
QCD有效电荷$α_{g_1}（q）$是一个可观察的，它表征了强相互作用的幅度。在高动量$ Q $下，它与QCD耦合$α_ {\ rm s}（q）$一致。在低$ Q $的情况下，它提供了对运行耦合的非扰动定义。我们已经从杰斐逊实验室（Jefferson Lab）进行的测量中提取了$α_{g_1}（q）$，该测量范围跨越了非常低至中等高的$ q $域，$ 0.14 \ leq q \ leq q \ leq 2.18 $ gev。与以前的提取相比，新结果的精度有所提高，下端的$ Q $覆盖率大大扩大。数据显示，$α_{g_1}（q）$在非常低$ q $的情况下变为$ q $。它们与基于Dyson-Schwinger方程和ADS/CFT二元性的QCD有效电荷的两个最新预测很好地进行了比较。
The QCD effective charge $α_{g_1}(Q)$ is an observable that characterizes the magnitude of the strong interaction. At high momentum $Q$, it coincides with the QCD running coupling $α_{\rm s}(Q)$. At low $Q$, it offers a nonperturbative definition of the running coupling. We have extracted $α_{g_1}(Q)$ from measurements carried out at Jefferson Lab that span the very low to moderately high $Q$ domain, $0.14 \leq Q \leq 2.18$ 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 $α_{g_1}(Q)$ 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.
