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arXiv 1005.4598hep-ph
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关于大质量胶子传播子、PT-BFM方案和解耦与标度DSE解的低动量行为

On the massive gluon propagator, the PT-BFM scheme and the low-momentum behaviour of decoupling and scaling DSE solutions

J. Rodríguez-Quintero

摘要:

研究了在PT-BFM格式下由Landau规范Dyson-Schwinger方程(DSE)得到的Yang-Mills传播子的低动量行为。我们比较了鬼传播子的数值结果与解析结果,通过分析朗道规范中的鬼传播子DSE的低动量行为,假设截断一个恒定的鬼胶子顶点和一个简单的模型,为一个巨大的胶子传播子。得到的渐近表达式的定期或去耦鬼敷料功能的顺序${\cal O}(q^2)$被证明是非常适合的数值PT-BFM结果。此外,当在一定尺度下重整化的耦合尺度接近某个临界值时,数值PT-BFM传播子的行为趋向于标度传播子。我们还表明,缩放的解决方案,这意味着一个发散的鬼敷料功能,不能是一个DSE解决方案中的PT-BFM计划,但无法达到的限制情况。

英文摘要:

We study the low-momentum behaviour of Yang-Mills propagators obtained from Landau-gauge Dyson-Schwinger equations (DSE) in the PT-BFM scheme. We compare the ghost propagator numerical results with the analytical ones obtained by analyzing the low-momentum behaviour of the ghost propagator DSE in Landau gauge, assuming for the truncation a constant ghost-gluon vertex and a simple model for a massive gluon propagator. The asymptotic expression obtained for the regular or decoupling ghost dressing function up to the order ${\cal O}(q^2)$ is proven to fit pretty well the numerical PT-BFM results. Furthermore, when the size of the coupling renormalized at some scale approaches some critical value, the numerical PT-BFM propagators tend to behave as the scaling ones. We also show that the scaling solution, implying a diverging ghost dressing function, cannot be a DSE solution in the PT-BFM scheme but an unattainable limiting case.

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