Description of the newly observed ${\mathrm{\Omega }}_c^{\ast }$ states as molecular states

In this work, we study the strong decays of the newly observed ${\mathrm{\Omega }}_c^{\ast }(3185)$ and ${\mathrm{\Omega }}_c^{\ast }(3327)$ assuming that ${\mathrm{\Omega }}_c^{\ast }(3185)$ and ${\mathrm{\Omega }}_c^{\ast }(3327)$ as $S$-wave $D\mathrm{\Xi }$ and $D^{\ast }\mathrm{\Xi }$ molecular state, respectively. Since the ${\mathrm{\Omega }}_c^{\ast }$ was observed in the ${\mathrm{\Xi }}_c^{+}{K}^{-}$ invariant mass distributions, the partial decay width of ${\mathrm{\Omega }}_c^{\ast }(3185)$ and ${\mathrm{\Omega }}_c^{\ast }(3327)$ into ${\mathrm{\Xi }}_c^{+}{K}^{-}$ through hadronic loops are evaluated with the help of the effective Lagrangians. Moreover, the decay channel of ${\mathrm{\Xi }}_c^{{}^{\mathrm{\prime }}}\bar{K}$ is also included. The decay process is described by the $t$-channel $\mathrm{\Lambda }$, $\mathrm{\Sigma }$ baryons and $D_s$, $D_s^{\ast }$ mesons exchanges, respectively. By comparison with the LHCb observation, the current results support the ${\mathrm{\Omega }}_c^{\ast }(3327)$ with$J^P=3\mathrm{/}{2}^{-}$ as pure $D^{\ast }\mathrm{\Xi }$ molecule while the ${\mathrm{\Omega }}_c^{\ast }(3327)$ with $J^P=1\mathrm{/}{2}^{-}$ can not be well reproduced in the molecular state picture. In addition, the spin-parity $J^P=1\mathrm{/}{2}^{-}$ $D\mathrm{\Xi }$ molecular assumptions for the ${\mathrm{\Omega }}_c^{\ast }(3185)$ can’t be conclusively determined. It may be a meson-baryon molecule with a big $D\mathrm{\Xi }$ component. Although the decay width of the ${\mathrm{\Omega }}_c^{\ast }\to \bar{K}{\mathrm{\Xi }}_c^{{}^{\mathrm{\prime }}}$ is of the order several MeV, it can be well employed to test the molecule interpretations of ${\mathrm{\Omega }}_c^{\ast }(3185)$ and ${\mathrm{\Omega }}_c^{\ast }(3327)$.