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arXiv 1405.7340hep-ph
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QCD共形窗口中传播子和连续耦合的红外特性

Infrared behaviour of propagators and running coupling in the conformal window of QCD

Markus Hopfer, Christian S. Fischer, Reinhard Alkofer

摘要:

利用Dyson-Schwinger方法研究了具有大量手征夸克味的Landau规范QCD。传播子水平上的自洽处理使我们能够通过胶子方程中的夸克圈图来研究非猝灭效应。在临界费米子味数以上,非微扰运行耦合在很宽的动量范围内发展出一个平台。相应地,传播子在此动量范围内遵循幂律行为,表明共形行为。我们的值$N_f^{crit}=4.5$对夸克-胶子顶点的细节非常敏感,需要在未来的研究中进行更详细的研究。

英文摘要:

Using the Dyson-Schwinger approach we investigate Landau gauge QCD with a relatively large number of chiral quark flavours. A self-consistent treatment on the propagator level enables us to study unquenching effects via the quark loop diagram in the gluon equation. Above the critical number of fermion flavours the non-perturbative running coupling develops a plateau over a wide momentum range. Correspondingly, the propagators follow a power law behaviour in this momentum range indicating conformal behaviour. Our value $N_f^{crit}=4.5$ is strongly sensitive to the details of the quark-gluon vertex calling for more detailed investigations in future studies.

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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