Classification of simple heavy vector triplet models
Classification of simple heavy vector triplet models
复制标题
简单重向量三元组模型的分类
DOI：
10.1103/physrevd.95.075022
复制
发表时间：
2017
影响因子：
5
通讯作者：
長井 遼
中科院分区：
文献类型：
--
作者：
阿部智広;長井 遼
我们以与模型无关的方式从微扰幺正性的角度研究了自旋 1 重矢量玻色子的衰变模式 ()。微扰幺正性需要耦合之间存在某种关系。这些关系称为幺正和规则。我们从包含两个费米子和两个规范玻色子的过程中推导出幺正性和规则。我们找到了 SM 费米子 () 的耦合和 SM 规范玻色子 () 的耦合之间的关系。使用耦合关系，我们计算衰减到 和 的部分衰减宽度。我们证明了在包含偶数标量以及 SM 粒子的系统中。该结果与偶标量的数量无关。我们还表明，只要奇标量同时耦合到 SM 费米子和 SM 规范玻色子，奇标量的贡献就有助于变得更大。奇标量耦合的存在是构建预测模型的有用指南。我们的分析仅依赖于 的微扰幺正性。因此，我们的结果可以应用于各种模型。
We investigate decay modes of spin-1 heavy vector bosons () from the viewpoint of perturbative unitarity in a model-independent manner. Perturbative unitarity requires some relations among couplings. The relations are called unitarity sum rules. We derive the unitarity sum rules from processes that contain two fermions and two gauge bosons. We find the relations betweencouplings to the SM fermions () andcouplings to the SM gauge bosons (). Using the coupling relations, we calculate partial decay widths fordecays intoand. We show thatin the system that containsand-even scalars as well as the SM particles. This result is independent of the number of the-even scalars. We also show that contributions of-odd scalars help to makelarger thanas long as the-odd scalars couple to both the SM fermions and the SM gauge bosons. The existence of the-odd scalar couplings is a useful guideline to construct models that predict. Our analysis relies only on the perturbative unitarity of. Therefore, our result can be applied to various models.