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arXiv 2006.10951hep-phhep-th
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$4D$隐正则化中规范理论的双环重整化和与量纲方法的联系

Two-loop renormalisation of gauge theories in $4D$ Implicit Regularisation and connections to dimensional methods

A. Cherchiglia, D. C. Arias-Perdomo, A. R. Vieira, M. Sampaio, B. Hiller

摘要:

我们计算的两个回路$β$ -功能的标量和旋量量子电动力学以及纯杨米尔斯和量子色动力学使用背景场方法在一个完全的四维设置使用隐式正则化(IREG)。此外,与维的方法,如传统的维正则化(CDR)和降维(DRED)进行了全面的比较。与洛伦兹代数收缩/对称积分内发散积分以及重正化计划相关的微妙之处在IREG内进行了仔细讨论,其中重正化常数被完全定义为任意循环顺序的基本发散积分。此外,我们证实了这一假设,即动量路由不变性的费恩曼图实现通过设置定义良好的表面项为零的循环提供非阿贝尔规范不变的振幅内IREG就像它已被证明为阿贝尔理论。

英文摘要:

We compute the two-loop $β$-function of scalar and spinorial quantum electrodynamics as well as pure Yang-Mills and quantum chromodynamics using the background field method in a fully quadridimensional setup using Implicit Regularization (IREG). Moreover, a thorough comparison with dimensional approaches such as conventional dimensional regularization (CDR) and dimensional reduction (DRED) is presented. Subtleties related to Lorentz algebra contractions/symmetric integrations inside divergent integrals as well as renormalisation schemes are carefully discussed within IREG where the renormalisation constants are fully defined as basic divergent integrals to arbitrary loop order. Moreover, we confirm the hypothesis that momentum routing invariance in the loops of Feynman diagrams implemented via setting well-defined surface terms to zero deliver non-abelian gauge invariant amplitudes within IREG just as it has been proven for abelian theories.

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