A meson-baryon molecular interpretation for some ${\Omega }_c$ excited baryons

Abstract

We explore the possibility that some of the five narrow ${\Omega }_c$ resonances recently observed at LHCb could correspond to pentaquark states, structured as meson-baryon bound states or molecules. The interaction of the low-lying pseudoscalar mesons with the ground-state baryons in the charm $+1$, strangeness $-2$ and isospin 0 sector is built from t-channel vector meson exchange, using effective Lagrangians. The resulting s-wave coupled-channel unitarized amplitudes show the presence of two structures with similar masses and widths to those of the observed ${\Omega }_c(3050{)}^0$ and ${\Omega }_c(3090{)}^0$. The identification of these resonances with the meson-baryon bound states found in this work would also imply assigning the values $1/2^{-}$ for their spin-parity. An experimental determination of the spin-parity of the ${\Omega }_c(3090{)}^0$ would help in disentangling its structure, as the quark-based models predict its spin-parity to be either $3/2^{-}$ or $5/2^{-}$.

9 pages, 4 figures

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Cited by in corpus (41)

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• Observed ${\Omega }_b$ spectrum and meson-baryon molecular states
• Double strangeness molecular-type pentaquarks from coupled channel dynamics
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• The molecular nature of some exotic hadrons
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• Toward establishing the low-lying $P$-wave excited ${\Sigma }_c$ baryon states
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• Exotic ${\Omega }_c^0$ baryons from meson-baryon scattering
• ${\Omega }_c$ excited states: a molecular approach with heavy-quark spin symmetry