International Conference on Exotic Atoms and Related Topics - EXA2017

We perform Dalitz plot analyses of $J/\psi$ three-body hadronic decays to ${\pi }^{+}{\pi }^{-}{\pi }^0$, $K^{+}{K}^{-}{\pi }^0$ and $K_S^0{K}^{\pm }{\pi }^{\mp }$ using the isobar and Veneziano models. The $J/\psi$ is produced through the Inital-State-Radiation process. We also perform Dalitz plot analyses of ${\eta }_c$ three-body hadronic decays to $K^{+}{K}^{-}{\pi }^0$ and $K_S^0{K}^{\pm }{\pi }^{\mp }$, where the ${\eta }_c$ is produced in two-photon interactions. An isobar model is used, as well as a Model Independent Partial Wave Analysis which allows to extract the amplitude and phase of the $K\pi$ S-wave up to a mass of 2.5 GeV.