Nature of the newly found $\mathrm{\Omega }(2109)$

We present model calculations to reveal the nature of the newly found ${\mathrm{\Omega }}^{-}(2109)$ by the BESIII Collaboration, and show that the state has a strong correlation with the ${\bar{K}}^{\ast }(892)\mathrm{\Xi }$ system. Our study is based on solving scattering equations in a coupled channel approach, which involves $K^{-}{\mathrm{\Xi }}^0$, ${\bar{K}}^0{\mathrm{\Xi }}^{-}$, $K^{\ast -}{\mathrm{\Xi }}^0$, and ${\bar{K}}^{\ast 0}{\mathrm{\Xi }}^{-}$. We obtain the lowest order amplitudes for different spin and isospin cases and find that an isoscalar state with spin-parity $1\mathrm{/}{2}^{-}$ is generated with precisely the same mass as ${\mathrm{\Omega }}^{-}(2109)$. We do not find any state with total spin 3/2, nor do we find any state in the isovector sector. We determine correlation functions to encourage such an experimental study and confirm the nature of ${\mathrm{\Omega }}^{-}(2109)$.