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arXiv · 1709.08737

A meson-baryon molecular interpretation for some $\Omega_c$ excited baryons

Glòria Montaña·Albert Feijoo·Àngels Ramos
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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 $5/2^-$.

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Glòria Montaña, Albert Feijoo, Àngels Ramos. 2017-09-25. A meson-baryon molecular interpretation for some $\Omega_c$ excited baryons. https://doi.org/10.1140/epja%2Fi2018-12498-1

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