Observation of five new narrow ${\mathrm{\Omega }}_c^0$ states decaying to ${\mathrm{\Xi }}_c^{+}{K}^{-}$

The ${\mathrm{\Xi }}_c^{+}{K}^{-}$ mass spectrum is studied with a sample of $pp$ collision data corresponding to an integrated luminosity of 3.3 fb${}^{-1}$, collected by the LHCb experiment. The ${\mathrm{\Xi }}_c^{+}$ is reconstructed in the decay mode $p K^- \pi^+$\mathrm{.}Fivenew,narrowexcited$\Omega_c^0$statesareobserved:the$\Omega_c(3000)^0$,$\Omega_c(3050)^0$,$\Omega_c(3066)^0$,$\Omega_c(3090)^0$, and ${\mathrm{\Omega }}_c(3119{)}^0$. Measurements of their masses and widths are reported.