论文标题
费米子复合模型的扰动单位性界限
Perturbative unitarity bounds for fermions composite models
论文作者
论文摘要
扰动单位性是推断给定有效场理论的有效性范围的强大工具。在这里，我们研究了在Fermion Compositess的情况下出现的Dimension-5和Dimension-6的参数空间中的束缚。这些操作员通常在LHC的实验搜索中使用这些操作员，以约束普通标准模型费米和质量$ M $的激发状态之间的触点和量表相互作用。我们得出了激发中微子的生产过程的统一性，然后实现了这种结合，并将其与运行2的最新实验排除曲线，高亮度和LHC的高能量构型进行了比较。结果还适用于通过Dimension-6触点相互作用产生通用的单个激发态的搜索。到目前为止，在这些有效模型中忽略的一级界限非常引人注目，并且还可以作为探索参数空间（$ m，λ$）的指南，此外还可以作为标准请求$ m \ m \leλ$。
Perturbative unitarity is a powerful tool for inferring the range of validity of a given effective field theory. Here, we study such a bound in the parameter space of dimension-5 and dimension-6 effective operators that arise in a scenario of fermion compositeness. These operators are routinely used in experimental searches at the LHC to constraint contact and gauge interactions between ordinary Standard Model fermions and excited states of mass $M$. We derive the unitarity bound for the production process of an excited neutrino, then we implement such bound and compare it with the recent experimental exclusion curves for Run 2, the High-Luminosity and High-Energy configurations of the LHC. The results also apply to the searches where a generic single excited state is produced via dimension-6 contact interactions. The unitarity bound, so far overlooked in these effective models, is quite compelling and can serve as a guide for exploring the parameter space ($M,Λ$) in addition to the standard request $M \le Λ$.
