Hadronic resonances enhanced by thresholds
| Autor: | Caramés, T. F., Valcarce, A. |
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| Rok vydání: | 2016 |
| Předmět: | |
| Zdroj: | Phys. Lett. B758, 244 (2016) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1016/j.physletb.2016.05.024 |
| Popis: | We present a neat example of a meson--baryon system where the vicinity of two different thresholds enhances the binding of a hadronic resonance, a pentaquark. As a consequence the pattern of states may change when moving among different flavor sectors, what poses a warning on naive extrapolations to heavy flavor sectors based on systematic expansions. For this purpose we simultaneously analyze the $N\bar D$ and $NB$ two-hadron systems looking for possible bound states or resonances. When a resonance is controlled by a coupled-channel effect, going to a different flavor sector may enhance or diminish the binding. This effect may, for example, generate significant differences between the charmonium and bottomonium spectra above open-flavor thresholds or pentaquark states in the open-charm and open-bottom sectors. Comment: 12 pages, 5 figures. To be published in Phys. Lett. B |
| Databáze: | arXiv |
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