Speaker
Description
Motivated by the recent BESIII report on $J/\psi\rightarrow\gamma K^S_0K^S_0\pi^0$ decay, we firstly perform a disperisve analysis to study the final-state-interactions (FSIs) in the three-body unitarity and try to gain some insights into the nature of long-standing puzzles of isos-scalar pseudo-scalar $\eta(1405/1475)$ which is related the radially excited states of $\eta-\eta'$ and pseudo-scalar glueballs. The two-body FSIs are established from the low-energy meson-meson scattering data within the Muskhelishvili-Omnes framework and then the generic three-body FSIs below 1.6GeV are learned by the Khrui-Trieman framework. The experimental data are described and the pole structure of $\eta(1405/1475)$ by analytical continuation will also be reported.
