Observation of new ${\mathrm{\Omega }}_c^0$ states decaying to the ${\mathrm{\Xi }}_c^{+}{K}^{-}$ final state

Two new excited states, ${\mathrm{\Omega }}_c(3185{)}^0$ and ${\mathrm{\Omega }}_c(3327{)}^0$, are observed in the ${\mathrm{\Xi }}_c^{+}{K}^{-}$ invariant-mass spectrum using proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of $9{\mathrm{f}\mathrm{b}}^{-1}$. Five previously observed excited ${\mathrm{\Omega }}_c^0$ states are confirmed, namely ${\mathrm{\Omega }}_c(3000{)}^0$, ${\mathrm{\Omega }}_c(3050{)}^0$, ${\mathrm{\Omega }}_c(3065{)}^0$, ${\mathrm{\Omega }}_c(3090{)}^0$, and ${\mathrm{\Omega }}_c(3119{)}^0$. The masses and widths of these seven states are measured with the highest precision to date.