arXiv 1302.44392013-02-18hep-ph

从大$x$深度非弹性散射中提取$α_s$

Extraction of $α_s$ from deep inelastic scattering at large $x$

A. Courtoy, S. Liuti

备注：: 11pages, 5 figures, aps bibliography style
DOI：: 10.1016/j.physletb.2013.08.058

摘要：

本文分析了运行耦合常数在微扰QCD和非微扰QCD交叉点上的作用。虽然到目前为止在这两个制度中考虑的方法似乎是相互补充的，但通过有效耦合的定义可能会得到统一的描述，因为它们都提供了分析其在尺度低值下冻结的方法。我们提取的有效耦合从所有可用的实验数据上的非极化结构功能的质子，$F_2^p$，在大值的Bjorken $x$，包括共振区。我们认为，如果在耦合常数中包括非微扰效应，则可以解释在该区域观察到的部分子-强子对偶性。我们的分析结果是从微扰到非微扰QCD物理的平滑过渡，体现在中间尺度下耦合常数的运行。

英文摘要：

We present an analysis of the role of the running coupling constant at the intersection of perturbative and nonperturbative QCD. Although the approaches that have been considered so far in these two regimes appear to be complementary to each other, a unified description might derive through the definition of the effective coupling, as they both provide ways of analyzing its freezing at low values of the scale. We extract the effective coupling from all available experimental data on the unpolarized structure function of the proton, $F_2^p$, at large values of Bjorken $x$, including the resonance region. We suggest that parton-hadron duality observed in this region can be explained if nonperturbative effects are included in the coupling constant. The outcome of our analysis is a smooth transition from perturbative to nonperturbative QCD physics, embodied in the running of the coupling constant at intermediate scales.

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