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arXiv 1808.07615hep-ph
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广义规范固定的双环有效势

Two-loop effective potential for generalized gauge fixing

Stephen P. Martin, Hiren H. Patel

摘要:

我们得到了一般可重整化理论的双回路有效势,使用广义规范固定方案,其中包括作为特殊情况的背景场$R_ξ$规范,费米规范,和熟悉的朗道规范,并在裸和\MSbar重整化方案中使用尺寸正则化。作为例子,结果,然后专门的阿贝尔希格斯模型和标准模型。在标准模型的情况下,我们研究了真空期望值和最小真空能量如何数值地依赖于规范固定参数。在固定的两个回路的顺序表现出足够大的规范固定参数的非收敛行为的结果,这可能是解决了一个remmation的高阶贡献。

英文摘要:

We obtain the two-loop effective potential for general renormalizable theories, using a generalized gauge-fixing scheme that includes as special cases the background-field $R_ξ$ gauges, the Fermi gauges, and the familiar Landau gauge, and using dimensional regularization in the bare and \MSbar renormalization schemes. As examples, the results are then specialized to the Abelian Higgs model and to the Standard Model. In the case of the Standard Model, we study how the vacuum expectation value and the minimum vacuum energy depend numerically on the gauge-fixing parameters. The results at fixed two-loop order exhibit non-convergent behavior for sufficiently large gauge-fixing parameters; this can presumably be addressed by a resummation of higher-order contributions.

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