强CP问题的现状
Status of the strong $CP$ problem
- State Key Laboratory of Dark Matter Physics, Tsung-Dao Lee Institute and School of Physics and Astronomy, Shanghai Jiao Tong University（上海交通大学物理与天文学院、李政道研究所暗物质全国重点实验室）
- Key Laboratory for Particle Astrophysics and Cosmology (MOE), and Shanghai Key Laboratory for Particle Physics and Cosmology, Shanghai Jiao Tong University（上海交通大学粒子天体物理与宇宙学教育部重点实验室、上海粒子物理与宇宙学重点实验室）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本综述阐述粒子物理标准模型中强CP问题的基础物理，总结其理论与唯象学现状，介绍知名的Peccei–Quinn机制及QCD轴子，并提及该问题的替代方案与新视角受关注的情况。
AI中文摘要：
强CP问题仍是粒子物理标准模型中的重大开放问题之一，其最知名的解决方案是Peccei–Quinn机制，该机制预言了一种新的赝标量玻色子——QCD轴子。近年来，该问题的替代解决方案及基础的新视角重新受到关注。本综述对其 underlying physics（ underlying physics可译为基础物理）进行教学性阐述，并总结该问题当前的理论与唯象学现状。
英文摘要：
The strong $CP$ problem remains one of the major open questions in the Standard Model of particle physics. Its best-known solution is the Peccei--Quinn mechanism, which predicts a new pseudoscalar boson, the QCD axion. In recent years, alternative solutions and new perspectives on the foundations of the strong $CP$ problem have also received renewed attention. In this review, we provide a pedagogical account of the underlying physics and summarise the current theoretical and phenomenological status of the problem.
