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arXiv · 1605.04428

Hadronic resonances enhanced by thresholds

T. F. Caramés·A. Valcarce
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Abstract

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.

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T. F. Caramés, A. Valcarce. 2016-05-14. Hadronic resonances enhanced by thresholds. https://doi.org/10.1016/j.physletb.2016.05.024

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