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

Abstract

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

All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2022-043.html (LHCb public pages)

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• Decay widths and mass spectra of single bottom baryons
• Heavy quark dominance in orbital excitation of singly and doubly heavy baryons
• Evidence for Two Excited ${\Omega }^{-}$ Hyperons
• Heavy-quark dominance and fine structure of excited heavy baryons ${\Sigma }_Q$, ${\Xi }_Q^{\prime }$ and ${\Omega }_Q$
• Systematic analysis of the mass spectra of triply heavy baryons
• First determination of the spin-parity of ${\Xi }_c(3055{)}^{+,0}$ baryons
• Observation of a new charmed baryon decaying to ${\Xi }_c^{+}{\pi }^{-}{\pi }^{+}$
• Mass spectra of singly heavy baryons in the relativized quark model with heavy-quark dominance
• Mass spectrum and magnetic moments of singly-charmed baryons: a quark-diquark model analysis of ${\Omega }_c(3185{)}^0$ and ${\Omega }_c(3327{)}^0$