Yang-Mills理论中的双圈有理项
Two-Loop Rational Terms in Yang-Mills Theories
摘要：
$D$维度中的散射振幅涉及源自UV极点与环路分子的$D-4$维度部分的相互作用的特定项。这样的贡献可以通过一组有限的过程独立的合理的counterterterms，这使得有可能计算循环振幅与数值工具，构建循环分子在四维。基于最近对双圈有理反项一般性质的研究[1]，本文研究了它们对重整化方案选择的依赖性。我们确定了一个非平凡形式的方案依赖，这源于质量和场的重正化与循环分子的$D-4$维部分的相互作用，我们表明，它可以通过一种新的单循环计数器项控制。这保证了给定可重整化理论的双回路有理反项可以用通用的重整化常数一劳永逸地导出，这可以后验地适应于任何方案。使用这种方法，我们提出了第一次计算的全套双圈合理的反项在杨米尔斯理论。结果适用于SU（N）和U（1）规范理论与任意质量的$n_{f}$费米子的耦合。
英文摘要：
Scattering amplitudes in $D$ dimensions involve particular terms that originate from the interplay of UV poles with the $D-4$ dimensional parts of loop numerators. Such contributions can be controlled through a finite set of process-independent rational counterterms, which make it possible to compute loop amplitudes with numerical tools that construct the loop numerators in four dimensions. Building on a recent study [1] of the general properties of two-loop rational counterterms, in this paper we investigate their dependence on the choice of renormalisation scheme. We identify a nontrivial form of scheme dependence, which originates from the interplay of mass and field renormalisation with the $D-4$ dimensional parts of loop numerators, and we show that it can be controlled through a new kind of one-loop counterterms. This guarantees that the two-loop rational counterterms for a given renormalisable theory can be derived once and for all in terms of generic renormalisation constants, which can be adapted a posteriori to any scheme. Using this approach, we present the first calculation of the full set of two-loop rational counterterms in Yang-Mills theories. The results are applicable to SU(N) and U(1) gauge theories coupled to $n_{f}$ fermions with arbitrary masses.
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