Charmed excited baryons with heavy-quark spin symmetry

Abstract

Recently five ${\Omega }_c$ excited states have been reported by the LHCb Collaboration, four of them corroborated by Belle. The Belle Collaboration has also discovered in 2017 one excited ${\Xi }_c$ with mass of 2930 MeV. In view of these recent detections, we analyze the possible molecular description of these states, using a unitarized baryon-meson model that incorporates both chiral and heavy-quark spin symmetries in a consistent manner. We pay a special attention to the renormalization procedure, so as to determine the robustness of our predictions. Within our model, we generate dynamically several ${\Omega }_c$ and ${\Xi }_c$ states. We find that, at least, three of our ${\Omega }_c$ states can be identified with the experimental ones and have spin-parity $J=1/2^{-}$ or $J=3/2^{-}$. Moreover, we find a plausible molecular description of not only the ${\Xi }_c(2930)$ state, but also ${\Xi }_c(2790)$, ${\Xi }_c(2815)$ and ${\Xi }_c(2970)$, reported in the PDG. Interestingly, we determine that ${\Xi }_c(2930)$ and ${\Xi }_c(2970)$ are heavy-quark spin partners with $J=1/2^{-}$ and $J=3/2^{-}$, respectively, while obtaining that ${\Xi }_c(2930)$, ${\Omega }_c(3090)$ or the ${\Omega }_c(3119)$, and ${\Sigma }_c(2800)$ would belong to the same SU(3) multiplet.

arXiv comment6 pages, contribution to the proceedings of the XVIII International Conference on Hadron Spectroscopy and Structure (HADRON2019), Guilin, China, 16-21 August 2019

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