Charmonium and charmoniumlike states at the BESⅢ experiment

作     者：Chang-Zheng Yuan Chang-Zheng Yuan

作者机构：Institute of High Energy PhysicsChinese Academy of Sciences University of Chinese Academy of Sciences 

出 版 物：《National Science Review》 (国家科学评论(英文版))

年 卷 期：2021年第8卷第11期

页      面：26-38页

核心收录：

学科分类：07[理学] 070202[理学-粒子物理与原子核物理] 0702[理学-物理学] 

基　　金：supported in part by the National Key Research and Development Program of China (2020YFA0406301) the National Natural Science Foundation of China (11961141012,11835012 and 11521505) the CAS Center for Excellence in Particle Physics (CCEPP) 

摘      要：Charmonium is a bound state of a charmed quark and a charmed antiquark,and a charmoniumlike state is a resonant structure that contains a charmed quark and antiquark pair but has properties that are incompatible with a conventional charmonium *** operating at center-of-mass energies from 2 to5 GeV,the BESⅢ experiment can access a wide mass range of charmonium and charmoniumlike states,and has contributed significantly in this *** review BESⅢ results involving conventional charmonium states,including the first observation of the M1 transition Ψ(2 S) γη(2 S) and the discovery of theΨ2(3823) state;and report on studies of charmoniumlike states,including the discoveries of the Z(3900)and Z(4020) tetraquark candidates,the resolution of the fine structure of the Y(4260) state,the discovery of the new production process e~+e~-γX(3872) and the uncovering of strong evidence for the commonality among the X(3872),Y(4260) and Z(3900) *** prospects for further research at BESⅢ and proposed future facilities are also presented.