Hadronic resonances enhanced by thresholds

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...

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Bibliographic Details
Published in:Physics letters. B 2016-07, Vol.758 (C), p.244-248
Main Authors: Caramés, T.F., Valcarce, A.
Format: Article
Language:English
Subjects:
Binding
Elementary particles
Extrapolation
Flavours
Joining
Spectra
Thresholds
Warning
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Summary: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 ND¯ 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.
ISSN:0370-2693
1873-2445
DOI:10.1016/j.physletb.2016.05.024