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arXiv 2006.02852hep-ph
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双回路计算中的有理项

Rational terms in two-loop calculations

Stefano Pozzorini, Hantian Zhang, Max F. Zoller

摘要:

我们提出了一个扩展的重正化过程的基础上的R-操作在$D$维度在两个循环的水平,在其中的分子的所有费曼图可以在四维中构建,和合理的条款所产生的相互作用的$(D-4)$维分子部分和UV极点完全重建从一个有限的一组通用的本地counterterterterms。这表示$R_2$类型的有理项的概念扩展到两个循环。我们提供了一个通用的方法来计算一个和两个循环的合理的counterterterterms从大量的单尺度蝌蚪积分。最后,我们提出了一套完整的合理的counterterterteres的UV起源QED到两个圈的顺序。

英文摘要:

We present an extension of the renormalisation procedure based on the R-operation in $D$ dimensions at two-loop level, in which the numerators of all Feynman diagrams can be constructed in four dimensions, and the rational terms stemming from the interplay of $(D-4)$-dimensional numerator parts and UV poles are fully reconstructed from a finite set of universal local counterterms. This represents an extension of the concept of rational terms of type $R_2$ to two loops. We provide a general method to compute one and two-loop rational counterterms from massive one-scale tadpole integrals. Finally, we present the full set of rational counterterms of UV origin for QED up to two-loop order.

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