Octet baryon and heavy meson interactions in chiral effective field theory

We calculate the effective potentials of the octet baryon and heavy meson systems using the chiral effective field theory up to the next-to-leading order. We consider the contact terms, one-pseudoscalar-meson and two-pseudoscalar-meson exchange contributions, facilitating a comprehensive analysis of the short-, mid-, and long-range interactions in these systems. The low energy constants (LECs) are correlated with those of the N̅N interaction using a quark-level Lagrangian approach. We also incorporate the decuplet baryon contributions in the loop diagrams. Our research provides new insights into several near-threshold charmed baryons [e.g., Λ_c(2940), Ξ_c(3055), and Ω_c(3188), etc.] around 3 GeV from the hadronic molecular perspective. We also identify several molecular states, designated as Ξ_c, within the mass range of 3100-3500 MeV. Further measurements of their resonance parameters and decay patterns in experiments will help to discriminate the conventional baryon and hadronic molecule explanations for these near-threshold states.