Neutrino mass hierarchy and lepton flavor mixing  

作　　者：XING Zhi-zhong 

机构地区：[1]Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China

出　　处：《Chinese Science Bulletin》2011年第24期2594-2599,共6页

摘　　要：In the standard model of particle physics there are three species of neutrinos whose masses were originally assumed to be zero. But the discovery of solar and atmospheric neutrino oscillations indicates that neutrinos are massive and lepton flavors are mixed. In this brief review we first give an overview of our current knowledge about the neutrino mass spectrum and lepton flavor mixing angles, and then comment on the seesaw mechanisms which allow us to understand the origin of tiny neutrino masses. We pay particular attention to the nearly tri-bi-maximal neutrino mixing pattern and the Friedberg-Lee symmetry to derive it. A relatively promising possibility of detecting hot and warm neutrino dark matter in the Universe will also be discussed.In the standard model of particle physics there are three species of neutrinos whose masses were originally assumed to be zero. But the discovery of solar and atmospheric neutrino oscillations indicates that neutrinos are massive and lepton flavors are mixed. In this brief review we first give an overview of our current knowledge about the neutrino mass spectrum and lepton flavor mix- ing angles, and then comment on the seesaw mechanisms which allow us to understand the origin of tiny neutrino masses. We pay particular attention to the nearly tri-bi-maximal neutrino mixing pattern and the Friedberg-Lee symmetry to derive it. A relatively promising possibility of detecting hot and warm neutrino dark matter in the Universe will also be discussed.

关 键 词：中微子振荡 味混合 轻子 质量层 粒子物理学 标准模型 混合模式 混合角 

分 类 号：O572.321[理学—粒子物理与原子核物理] O572.32[理学—物理]