主 讲 人 ：王雅迪    副教授

活动时间：09月12日15时30分    

地      点 ：理科2号楼B409

讲座内容：

The strong and electromagnetic interactions are two main decay mechanisms in charmonium decays. The relative phase between them is a basic parameter in understanding the decay dynamics, especially for the precise measurements. Based on indirect studies on J/psi two body decay modes: 1-0-, 0-0-, 1-1-, and NNbar, the relative phase is around 90 degrees. There is also some results from psi(3686) which do not veto the 90 degrees possibility. From the theoretical point of view, both sub-amplitudes in perturbative QCD and QED should be real which means the relative phase should be 0 degree which is conflict with the indirect results. In this talk, we present the direct measurement with resonance scan method. By introducing the EM amplitude from continuum decay, the interference between EM and strong mechanism is measured directly in J/psi, psi(3686) and psi(3773) decays.

主讲人介绍：

王雅迪，华北电力大学副教授，博士生导师。博士毕业于中国科学技术大学粒子物理与核物理专业，本科毕业于河北师范大学物理学专业；曾先后在意大利国家核物理研究院弗拉斯卡蒂国家实验室、德国GSI亥姆霍兹美因茨研究所工作。长期从事高能粒子物理实验和相关软件开发, 北京谱仪（BESIII）合作组成员，在奇特强子态、轻强子谱、QCD物理等方面有重要贡献，曾获国自然青年基金以及北京市杰青项目资助。主讲本科生《原子核物理基础》、《核辐射探测与防护》、《理论力学》（核）等主干课程。