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arXiv 0910.4489hep-ph
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非微扰QCD有效电荷

Non-perturbative QCD effective charges

Arlene C. Aguilar, Joannis Papavassiliou

摘要:

利用由Schwinger-Dyson方程(SDEs)得到的胶子传播子和鬼传播子,我们构造了QCD的非微扰有效荷。我们采用两种不同的定义,尽管它们不同的场论起源,产生定性可比的结果,凭借一个至关重要的非微扰身份。最重要的是,无论是定义获得的QCD电荷冻结在深红外,在理论和唯象的预期。这种建设所需的各种理论成分进行了详细审查,并简要讨论了一些概念上的微妙之处。

英文摘要:

Using gluon and ghost propagators obtained from Schwinger-Dyson equations (SDEs), we construct the non-perturbative effective charge of QCD. We employ two different definitions, which, despite their distinct field-theoretic origin, give rise to qualitative comparable results, by virtue of a crucial non-perturbative identity. Most importantly, the QCD charge obtained with either definition freezes in the deep infrared, in agreement with theoretical and phenomenological expectations. The various theoretical ingredients necessary for this construction are reviewed in detail, and some conceptual subtleties are briefly discussed.

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