摘要：

The non-perturbative property of Quantum Chromodynamics (QCD) in the low energy regime is critical to our understanding of the confinement of quarks and gluons into hadrons. The dynamical mechanism of confinement is one of the key issues in the research of fundamental structure of matter. BESIII collected the world’s largest data sets of e+e− annihilation in τ−charm energy region, which allow to shed light on this challenging issue. Search and study of QCD exotics beyond simple quark model provide critical information on the quantitative understanding of strong interaction and confinement in the low energy regime. Evidence for the observation of states with explicitly exotic quantum numbers forbidden by qqbar configuration, for instance the isovector 1-+  states π1(1400) and π1(1600), has been reported by several experiments. However, even after many years definitive conclusions have still to be reached.  Searching for the isoscalar 1-+ is very critical. In 2022, BESIII observed an isoscalar 1-+ exotic resonance, η1(1855),  in the amplitude analysis of J/ψ-->γηη'.

报告人简介：

刘北江，中国科学院高能物理研究所研究员。2008年于中国科学院高能物理研究所获得博士学位。历任BESIII国际合作组轻强子物理组长、物理分析负责人，现任报告委员会主席。主导BESIII胶球系统研究、1−+奇特态η1(1855)的首次发现；在分波分析方面做出重要贡献。主持科技部国家重点研发计划“奇特强子态及强子谱学研究”轻强子谱课题，基金委重点、面上等项目；入选中科院青年创新促进会，获基金委优秀青年基金。担任分波分析系列国际会议（ATHOS/PWA）国际顾问委员会成员，在ICHEP、HADRON等重要国际会议上做大会特邀综述报告。