Hadronic resonances enhanced by thresholds

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.

arXiv comment12 pages, 5 figures. To be published in Phys. Lett. B

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Cited by in corpus (4)

• Exotic $bc\bar{q}\bar{q}$ four-quark states
• Revisiting hidden-charm pentaquarks from QCD sum rules
• Hidden and open heavy-flavor hadronic states
• The axial charges of the hidden-charm pentaquark states