Hadronic structures from threshold cusps and triangle singularities

by Prof. Fengkun Guo (ITP, CAS)

Thursday 29 Oct 2020, 11:00 → 12:00 Asia/Shanghai

B105 (CHEP)

Abstract: The spectrum of hadrons is the manifestation of color confinement of quantum chromodynamics. Hadronic resonances correspond to poles of the S-matrix. Since 2003, lots of new hadron resonant structures containing heavy quarks were discovered. Many of them are candidates of exotic hadrons. However, the S-matrix also has kinematical singularities due to the on-shellness of intermediate particles, such as two-body thresholds and triangle singularities, and they can produce resonant-like structures as well. Such effects need to be taken into account in data analysis. Moreover, they can also be used as tools for precision measurements. In this talk, I will discuss their physical picture and a few examples related to exotic hadron candidates, including X(3872), Zc(3900) and X(6900). 报告人简介：郭奉坤，中国科学院理论物理研究所研究员。2002年本科毕业于山东大学，2007年在中科院高能物理研究所获得博士学位，随后在德国于利希研究中心以及波恩大学从事博士后研究工作，并担任德国DFG项目负责人。2015年加入理论物理研究所。主要从事强子谱、有效场论等方面的研究工作。 Both online and on-site meeting are available. On-site meeting is in room B105, school of physics, Peking University. Online Tencent/VOOV meeting: link: https://meeting.tencent.com/s/BtrZb6YbBRp4 ID: 360 639 674

Slides PKU2020_FKGuo.pptx