期刊论文

Recent advances in experimental studies of the doubly charmed baryons

中文

中国科学基金

1000-8217

2018

32

6

589-595

10.16262/j.cnki.1000-8217.2018.06.007

国家自然科学基金（项目批准号:11161140590,11575091,11435003,11425524）； 国家重点研发计划项目“大型强子对撞机LHCb实验的物理研究”（项目编号:2017YFA0402100）； 中组部“青年***计划”等资助；

本校为其他机构

双粲重子是夸克模型预言的由两个粲夸克和一个轻夸克组成的重子,其内部结构预期迥异于诸如质子和中子等普通重子,具有独特的性质,研究和寻找双粲重子是粒子物理理论和实验共同关注的重大课题。我们经过多年的努力,利用位于欧洲核子研究中心大型强子对撞机上的LHCb实验于2016年采集的质心能量为13万亿电子伏特的质子-质子对撞数据,在实验上首次观测到由两个粲夸克和一个上夸克组成的双粲重子,并测量了其质量和寿命。我们也通过该双粲重子的另一个衰变道证实了该发现。这些研究成果开创了一个新的粒子物理实验研究领域,将加深我们对于强相互作用和夸克模型的理解。

The doubly charmed baryons are formed by two charm quarks and one light quark, as precllcted by the quark model. They are expected to have different internal structures than those of the normal baryons such as the proton and the neutron, therefore have unique properties. Study and search for the doubly charmed baryons is the key research topic both for the theoretical and experimental particle physics. After enormous efforts in the past years, we have discovered the doubly charmed baryon containing two charm quarks and one up quark for the first time, and measured its mass and lifetime. Such d...