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arXiv 0910.5689hep-ph
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具有红外有限SDE解的QCD唯象

QCD phenomenology with infrared finite SDE solutions

A. A. Natale

摘要:

Schwinger-Dyson方程的求解以及纯胶QCD的格点模拟的最新进展表明胶子传播子和耦合常数是红外有限的。我们讨论了如何将这种非微扰信息引入到QCD的微扰展开中,给出了一些树级强子反应的例子,这些例子成功地拟合了实验数据,胶子传播子和耦合常数取决于动态生成的胶子质量。这个红外质量标度作为一个自然的截止,并消除了一些特设的参数通常发现在微扰QCD计算。这些IR有限格林函数的情况下,高阶项的微扰展开的应用进行了评论。

英文摘要:

Recent progress in the solution of Schwinger-Dyson equations (SDE), as well as lattice simulation of pure glue QCD, indicate that the gluon propagator and coupling constant are infrared (IR) finite. We discuss how this non-perturbative information can be introduced into the QCD perturbative expansion in a consistent scheme, showing some examples of tree level hadronic reactions that successfully fit the experimental data with the gluon propagator and coupling constant depending on a dynamically generated gluon mass. This infrared mass scale acts as a natural cutoff and eliminates some of the ad hoc parameters usually found in perturbative QCD calculations. The application of these IR finite Green's functions in the case of higher order terms of the perturbative expansion is commented.

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