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arXiv 2311.13630hep-ph
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两圈阶的功能匹配与重整化群方程

Functional Matching and Renormalization Group Equations at Two-Loop Order

Javier Fuentes-Martín, Ajdin Palavrić, Anders Eller Thomsen

AI总结:

本文提出一种系统方法,通过功能方法确定两圈有效拉格朗日量,证明匹配系数由圈积分硬区域决定,并应用于标量玩具模型计算匹配系数与重整化群方程。

摘要:

我们提出了一种系统方法,用于确定在紫外标量理论中积分掉一组重粒子后得到的两圈有效拉格朗日量。我们证明了匹配系数完全由圈积分的(双)硬区域决定,并给出了适用于图解方法和功能方法的匹配主公式。我们进一步采用功能方法来确定有效拉格朗日量的紧凑表达式,这些表达式不依赖于其结构或对称性的任何先验知识。相同的方法也适用于重整化群方程的计算。我们通过计算一个标量玩具模型中的两圈匹配系数和重整化群方程,展示了功能方法的应用。

英文摘要:

We present a systematic method for determining the two-loop effective Lagrangian resulting from integrating out a set of heavy particles in an ultraviolet scalar theory. We prove that the matching coefficients are entirely determined from the (double-)hard region of the loop integrals and present a master formula for matching, applicable to both diagrammatic and functional approaches. We further employ functional methods to determine compact expressions for the effective Lagrangian that do not rely on any previous knowledge of its structure or symmetries. The same methods are also applicable to the computation of renormalization group equations. We demonstrate the application of the functional approach by computing the two-loop matching coefficients and renormalization group equations in a scalar toy model.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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