The LHCb Collaboration at the Large Hadron Collider at CERN discovered two pentaquark states Pc(4380) and Pc(4450). These two hidden-charm states are interpreted as the loosely bound Σc(2455)D* and Σc*(2520)D* molecular states in the boson exchange interaction model, which provides an explanation for why the experimental width of Pc(4450) is much narrower than that of Pc(4380). The discovery of the new resonances Pc(4380) and Pc(4450), indeed, opens a new page for hadron physics. The partners of Pc(4380) and Pc(4450) should be pursued in future experiments.
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Chen et al. (2015) studied this question.
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