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arXiv 2109.03528hep-ph
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标准模型及以后电荷的全阶重整化

All-order renormalization of electric charge in the Standard Model and beyond

Stefan Dittmaier

摘要:

电荷,定义在电子-光子相互作用顶点的汤姆逊极限中,在标准模型和任何自发破缺规范理论中都被重整化到所有的阶数,其中规范群GxU(1)具有与电磁规范对称性混合的群因子U(1)。在背景场方法的框架下,电荷重整化常数$Z_e$直接由光子波函数重整化常数得到,类似于QED中的情况,这证明了电荷普适性是一个副产品。利用任意$R_ξ$规范中的电荷普适性,通过公式化仅通过无穷小电荷耦合的"假费米子“的电荷重整化条件,$Z_e$可以用仅从规范玻色子自能获得的重整化常数来表示。

英文摘要:

Electric charge, as defined in the Thomson limit of the electron--photon interaction vertex, is renormalized to all orders both in the Standard Model and in any spontaneously broken gauge theory with gauge group GxU(1) with a group factor U(1) that mixes with electromagnetic gauge symmetry. In the framework of the background-field method the charge renormalization constant $Z_e$ is directly obtained from the photon wave-function renormalization constant, similar to the situation in QED, which proves charge universality as a byproduct. Exploiting charge universality in arbitrary $R_ξ$ gauge by formulating the charge renormalization condition for a ``fake fermion'' that couples only via an infinitesimal electric charge, $Z_e$ can be expressed in terms of renormalization constants that are obtained solely from gauge-boson self-energies.

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