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arXiv 1806.08397hep-phhep-lathep-th
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线性协变$R_ξ$规范中的胶子传播子

The gluon propagator in linear covariant $R_ξ$ gauges

Fabio Siringo, Giorgio Comitini

摘要:

通过对纯Yang-Mills理论的精确Faddeev-Popov拉格朗日量的屏蔽质量展开,导出了一般线性协变$R_ξ$规范中胶子传播子的显式解析表达式.在单圈情况下,如果加强了极点结构的规范不变性,胶子修饰函数是完全唯一确定的,不需要任何自由参数或外部输入。对于任何$ξ$,胶子传播子在IR中都是有限的,当从朗道规范($ξ=0$)到费曼规范($ξ=1$)时,其极限值略有减小。一个很好的协议被发现与晶格的范围$0<ξ<0.5$的数据是可用的。

英文摘要:

Explicit analytical expressions are derived for the gluon propagator in a generic linear covariant $R_ξ$ gauge, by a screened massive expansion for the exact Faddeev-Popov Lagrangian of pure Yang-Mills theory. At one-loop, if the gauge invariance of the pole structure is enforced, the gluon dressing function is entirely and uniquely determined, without any free parameter or external input. The gluon propagator is found finite in the IR for any $ξ$, with a slight decrease of its limit value when going from the Landau gauge ($ξ=0$) towards the Feynman gauge ($ξ=1$). An excellent agreement is found with the lattice in the range $0<ξ<0.5$ where the data are available.

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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