Inspired by the discovery of two pentaquarks P c (4380) and P c (4450) at the LHCb detector, we study possible hidden-charm molecular pentaquarks in the framework of quark delocalization color screening model. Our results suggest that both N η c with IJ P = is a resonance, it may not be a good candidate of the observed P c (4450) because of the opposite parity of the state to P c (4380), although the mass of the state is not far from the experimental value. In addition, the calculation is extended to the hidden-bottom pentaquarks, and similar properties to that of hidden-charm pentaquarks system are obtained.
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