论文标题
高质量的Nelson-Barr解决方案解决了强大的CP问题，$θ=π$
High quality Nelson-Barr solution to the strong CP problem with $θ=π$
论文作者
论文摘要
我们讨论了强大的CP问题的尼尔森 - 巴尔（NB）解决方案的复合紫外线完成。在我们的构造中，CP对称性通过$θ=π$的隐藏QCD的动力学自发折断。我们专注于最小的NB构造实施，其中可见的扇区包含一对额外的矢量般的上/下夸克。我们表明，最小的NB理论遇到了质量问题，并讨论了复合紫外线完成如何解决。我们提出了一个简单的可计算方案，没有质量问题，其中隐藏扇区中的动态CP违规是通过标量门户介导的可见扇区，该扇区成功地实现了NB的结构。
We discuss composite UV completions of the Nelson-Barr(NB) solution to the strong CP problem. In our construction, the CP symmetry is broken spontaneously by the dynamics of a hidden QCD at $θ=π$. We focus on the minimal implementation of the NB construction where the visible sector contains one extra pair of vector-like up/down quarks. We show that the minimal NB theory suffers from a quality problem, and discuss how composite UV completions may resolve it. We present a simple calculable scheme, free of a quality problem, where dynamical CP violation in the hidden sector is mediated through a scalar portal to the visible sector, which successfully realizes the NB construction.
