Possible pentaquarks with heavy quarks

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 eta(c) with IJ(P) = 1/2 1/2(-) and NJ/psi with IJ(P) = 1/2 3/2(-) are bounded by channels coupling. However, NJ/psi with IJ(P) = 1/2 3/2(-) may be a resonance state in the D-wave N eta c scattering process. Moreover, P-c(4380) can be explained as the molecular pentaquark of Sigma D-*(c) with quantum numbers IJ(P) = 1/2 3/2(-). The state Sigma(cDD)-D-** with IJ(P) = 1/2 5/2(-) 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.