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Title: | A meson-baryon molecular interpretation for some (Ωc) excited states |
Author: | Montaña Faiget, Glòria Feijoo Aliau, Albert Ramos Gómez, Àngels |
Keywords: | Barions Quarks Baryons Quarks |
Issue Date: | 25-Apr-2018 |
Publisher: | Società Italiana di Fisica & Springer Verlag |
Abstract: | We explore the possibility that some of the five narrowΩcresonances recently observed at LHCbcould correspond to pentaquark states, structured as meson-baryon bound states or molecules. The inter-action 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. Theresulting s-wave coupled-channel unitarized amplitudes show the presence of two structures with similarmasses and widths to those of the observedΩc(3050)0andΩc(3090)0. The identification of these reso-nances 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 theΩc(3090)0would contributeto a better understanding of its structure, as the quark-based models predict its spin-parity to be either3/2−or 5/2−. Predictions for the analogue bottomΩ−bresonances are also given. |
Note: | Versió postprint del document publicat a: https://doi.org/10.1140/epja/i2018-12498-1 |
It is part of: | European Physical Journal A, 2018, vol. 54, num. 4, p. 64 |
URI: | http://hdl.handle.net/2445/129966 |
Related resource: | https://doi.org/10.1140/epja/i2018-12498-1 |
ISSN: | 1434-6001 |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) |
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