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A meson-baryon molecular interpretation for some \(\Omega_{c}\) excited states

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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 contribute to a better understanding of its structure, as the quark-based models predict its spin-parity to be either \( 3/2^{-}\) or \( 5/2^{-}\). Predictions for the analogue bottom \(\Omega_{b}^{-}\) resonances are also given.

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Authors and Affiliations

  1. Departament de Física Quàntica i Astrofísica and Institut de Ciències del Cosmos (ICCUB), Universitat de Barcelona, Martí i Franquès 1, 08028, Barcelona, Spain

    Glòria Montaña, Albert Feijoo & Àngels Ramos

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  1. Glòria Montaña
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  2. Albert Feijoo
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  3. Àngels Ramos
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Correspondence to Àngels Ramos.

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Communicated by Shi-Lin Zhu

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Montaña, G., Feijoo, A. & Ramos, À. A meson-baryon molecular interpretation for some \(\Omega_{c}\) excited states. Eur. Phys. J. A 54, 64 (2018). https://doi.org/10.1140/epja/i2018-12498-1

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