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We adopt the chiral perturbation theory to calculate the$\Sigma_{c}^{(*)}\bar{D}^{(*)}$ interaction to the next-to-leading order (NLO)and include the couple-channel effect in the loop diagrams. We reproduce thethree $P_c$ states in the molecular picture after including the$\Lambda_{c}\bar{D}^{(*)}$ intermediate states. We also discuss some novelobservations arising from the loop diagrams.

Hidden charm pentaquark states and $\Sigma_c^{(*)}\bar{D}^{(*)}$ interaction in chiral perturbation theory

Hidden charm pentaquark states and $\Sigma_c^{()}\bar{D}^{()}$ interaction in chiral perturbation theory