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arXiv 2203.09307hep-ph
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超越领先阶的分数阶解析QCD

Fractional Analytic QCD beyond Leading Order

A. V. Kotikov, I. A. Zemlyakov

AI总结:

本文在超越领先阶层次上利用逆对数展开构建分数阶解析QCD,证明该方法对所有宗量取值均适用,并给出基于多重对数、广义欧拉ζ函数和色散积分的紧凑结果,成功应用于极化Bjorken求和规则研究。

摘要:

分数阶解析QCD利用标准逆对数展开在超越领先阶的层次上被构建出来。研究表明,与通常的QCD耦合常数不同——对于通常的QCD耦合常数,这种展开只能在其宗量取大值时使用——在解析QCD的情形下,逆对数展开对解析耦合常数宗量的所有取值都适用。我们给出了四种不同的表述,其中两种主要基于多重对数函数和广义欧拉ζ函数,另外两种则基于色散积分。所得到的结果达到微扰论第5阶,具有紧凑的形式,并且不包含此前用于解决该问题时所使用的复杂特殊函数。作为一个例子,我们将所得结果应用于研究极化Bjorken求和规则,该求和规则目前已被非常精确地测量。

英文摘要:

Fractional analytic QCD is constructed beyond leading order using the standard inverse logarithmic expansion. It is shown that, contrary to the usual QCD coupling constant, for which this expansion can be used only for large values of its argument, in the case of analytic QCD, the inverse logarithmic expansion is applicable for all values of the argument of the analytic coupling constant. We present four different views, two of which are based primarily on Polylogarithms and generalized Euler $ζ$-functions, and the other two are based on dispersion integrals. The results obtained up to the 5th order of perturbation theory, have a compact form and do not contain complex special functions that were used to solve this problem earlier. As an example, we apply our results to study the polarized Bjorken sum rule, which is currently measured very accurately.

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