AXIONS AND OTHER SIMILAR PARTICLES

• 来源期刊: 中国物理C（英文版）
• 年，卷（期）: 2016,（10）
• 页码范围: 620-632
• 页数: 13页
• 语种: 中文

摘要

Introduction In this section,we list coupling-strength and mass limits for light neutral scalar or pseudoscalar bosons that couple weakly to normal matter and radiation.Such bosons may arise from a global spontaneously broken U(1) symmetry,resulting in a massless Nambu-Goldstone (NG) boson.If there is a small explicit symmetry breaking,either already in the Lagrangian or due to quantum effects such as anomalies,the boson acquires a mass and is called a pseudo-NG boson.Typical examples are axions (A0) [1,2],familons [3] and Majorons [4],associated,respectively,with a spontaneously broken Peccei-Quinn,family and lepton-number symmetry.