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Landau-Khalatnikov-Fradkin transformations, Nielsen identities, their equivalence, and implications for QCD

机译:Landau-Khalatnikov-Fradkin转换,尼尔森身份,他们的等价和对QCD的影响

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The Landau-Khalatnikov-Fradkin transformations (LKFTs) represent an important tool for probing the gauge dependence of the correlation functions within the class of linear covariant gauges. Recently these transformations have been derived from first principles in the context of non-Abelian gauge theory (QCD) introducing a gauge invariant transverse gauge field expressible as an infinite power series in a Stueckelberg field. In this work we explicitly calculate the transformation for the gluon propagator, reproducing its dependence on the gauge parameter at the one-loop level and elucidating the role of the extra fields involved in this theoretical framework. Later on, employing a unifying scheme based upon the Becchi-Rouet-Stora-Tyutin symmetry and a resulting generalized Slavnov-Taylor identity, we establish the equivalence between the LKFTs and the Nielsen identities which are also known to connect results in different gauges.
机译:Landau-Khalatnikov-Fradkin变换(LKFTS)代表了探测相关功能在线性协调仪类别中的尺寸依赖性的重要工具。 最近,这些转变已经从非雅思仪表理论(QCD)的上下文中引入了一个规范不变的横向仪器领域,以斯图克尔伯格领域中的无限电力系列表示的规范不变横向规。 在这项工作中,我们明确地计算了Gluon传播者的转换,在一个环路级别中再现了对仪表参数的依赖性,并阐明了涉及本理论框架中所涉及的额外领域的作用。 稍后,采用基于Becchi-Rouet-Stora-tyutin对称性的统一方案和所产生的广义Slavnov-Taylor认证,我们建立了LKFTS与尼尔森身份之间的等价,也已知将结果连接在不同的仪表中。

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