Molecular picture for the $\mathrm{\Omega }(2012)$ revisited

We conduct a study of the interaction of the $\bar{K}{\mathrm{\Xi }}^{\ast }$, $\eta \Omega$($s$-wave)and$\bar K \Xi$($d$-wave) channels within a coupled channel unitary approach where the transition potential between the $\bar{K}{\mathrm{\Xi }}^{\ast }$ and $\eta \mathrm{\Omega }$ channels is obtained from chiral Lagrangians. The transition potential between $\bar{K}{\mathrm{\Xi }}^{\ast }$, $\eta \mathrm{\Omega }$ and $\bar{K}\mathrm{\Xi }$ is taken in terms of free parameters, which together with a cut off to regularize the meson-baryon loops are fitted to the $\mathrm{\Omega }(2012)$ data. We find that all data including the recent Belle experiment on $\Gamma_{\Omega^* \to \pi \bar K \Xi}/ \Gamma_{\Omega^* \to \bar K \Xi}$, are compatible with the molecular picture stemming from meson baryon interaction of these channels.