Speaker
Description
Investigating the structures of baryon resonances is one of the fundamental tasks in hadron physics. However, the structures cannot be experimentally observed directly, and the theoretical studies face difficulty by the non-perturbative nature of QCD. The philosophy of “dynamical coupled-channel approaches” is to consider as many data as possible in all relevant coupled-channels, to extract the structures in a data-driven manner. In this talk I introduce the Juelich-Bonn-Washington coupled-channel approach, through which the transition form factors of twelve $N^*$ and $\Delta$ resonances has been extracted from more than $10^5$ data points. Some other information about the hadron structures, e.g. compositeness criteria, will also be discussed.