Speaker
Description
We have studied nucleon and hyperon resonances based on the experimental scattering data and lattice QCD simulations within Hamiltonian effective field theory. Some of them are very exotic, for example, the $\Lambda(1405)$ is mainly a $\bar K N$ molecule and the $N^*(1440)$ is dynamically generated. However, the traditional triquark states are still very important and exist in the excited baryons, for example, the $\Lambda(1670)$ contains the conventional quark model $\Lambda(1P)$. Pion photoproductions or electroproductions are also essential processes to further disclose the properties of nucleon and hyperon resonances, and we have also investigated their experimental and very recent lattice QCD data. By these combined analyses, both the coupled channels and the triquark bases play special roles in these low lying baryon resonances. Recent progresses of the related topics will be also reviewed in this report.
