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arXiv 0712.0780hep-ph
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费曼规范中的红外有限鬼传播子

Infrared finite ghost propagator in the Feynman gauge

A. C. Aguilar, J. Papavassiliou

摘要:

我们演示了如何从QCD的Schwinger-Dyson方程得到费曼规范下的红外有限鬼传播子。这种结构的关键成分是非微扰胶子-鬼顶点的纵向形状因子,与朗道规范中发生的情况相反,它对鬼的间隙方程有着重要的贡献。对相应的顶点方程的详细研究表明,在动态红外截止的存在下,这种形状因子在鬼动量消失的极限下仍然是有限的。这反过来又允许虚体自能在红外线中达到一个有限值,而不必假设胶子虚体顶点的任何额外性质,例如无质量极点的存在。简要概述了这一结果的影响和未来可能的方向。

英文摘要:

We demonstrate how to obtain from the Schwinger-Dyson equations of QCD an infrared finite ghost propagator in the Feynman gauge. The key ingredient in this construction is the longitudinal form factor of the non-perturbative gluon-ghost vertex, which, contrary to what happens in the Landau gauge, contributes non-trivially to the gap equation of the ghost. The detailed study of the corresponding vertex equation reveals that in the presence of a dynamical infrared cutoff this form factor remains finite in the limit of vanishing ghost momentum. This, in turn, allows the ghost self-energy to reach a finite value in the infrared, without having to assume any additional properties for the gluon-ghost vertex, such as the presence of massless poles. The implications of this result and possible future directions are briefly outlined.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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