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arXiv 2104.07037hep-th
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微扰重整化群函数的模糊性和发散性

On Ambiguities and Divergences in Perturbative Renormalization Group Functions

Florian Herren, Anders Eller Thomsen

摘要:

从微扰理论中的3圈阶出发,在$ \overline{\text{MS}} $方案中选择场强重整化因子存在模糊性。更令人关注的是,平凡地选择厄米因子已被证明产生发散的重整化群函数,这通常被理解为有限量。我们证明了RG函数的发散是这样的,它们消失在RG方程由于沃德恒等式与味对称性。事实证明,任何这样的分歧可以使用重正化模糊性来去除,并且优选使用风味改进的$ β$函数。我们展示了我们的观测如何解决在以前的3-循环SM汤川$ β$ -函数的计算中出现的分歧的问题,并提供了第一次计算的味道改进的3-循环SM $ β$ -函数在无规范限制。

英文摘要:

There is an ambiguity in choosing field-strength renormalization factors in the $ \overline{\text{MS}} $ scheme starting from the 3-loop order in perturbation theory. More concerning, trivially choosing Hermitian factors has been shown to produce divergent renormalization group functions, which are commonly understood to be finite quantities. We demonstrate that the divergences of the RG functions are such that they vanish in the RG equation due to the Ward identity associated with the flavor symmetry. It turns out that any such divergences can be removed using the renormalization ambiguity and that the use of the flavor-improved $ β$-function is preferred. We show how our observations resolve the issue of divergences appearing in previous calculations of the 3-loop SM Yukawa $ β$-functions and provide the first calculation of the flavor-improved 3-loop SM $ β$-functions in the gaugeless limit.

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