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One-loop corrections to the Zbb¯ vertex in models with scalar doublets and singlets
Nuclear Physics B ( IF 2.8 ) Pub Date : 2020-07-27 , DOI: 10.1016/j.nuclphysb.2020.115131
Duarte Fontes , Luís Lavoura , Jorge C. Romão , João P. Silva

We study the one-loop corrections to the Zbb¯ vertex in extensions of the Standard Model with arbitrary numbers of scalar doublets, neutral scalar singlets, and charged scalar singlets. Starting with a general parameterization of theories with neutral and singly-charged scalar particles, we derive the conditions that, in a renormalizable model, must be obeyed by the couplings in order for the divergent contributions to cancel. Then, we show that those conditions are indeed obeyed by the models that we are interested in, and we write down the full finite expression for the vertex in those models. We apply our results to some particular cases, highlighting the importance of the diagrams with neutral scalars.



中文翻译:

一环修正 žbb¯ 标量双峰和单峰的模型中的顶点

我们研究了对 žbb¯标准模型扩展中的顶点,具有任意数量的标量双峰,中性标量单峰和带电标量单峰。从具有中性和单电荷标量粒子的理论的一般参数化开始,我们得出条件,在可重归一化模型中,耦合必须服从这些条件才能消除发散的贡献。然后,我们证明我们感兴趣的模型确实遵守了这些条件,并写下了这些模型中顶点的完整有限表达式。我们将结果应用于某些特定情况,突出了具有中性标量的图的重要性。

更新日期:2020-08-04
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