Systematics of the heavy flavor hadronic molecules

With a quark level interaction, we give a unified description of the loosely bound molecular systems composed of the heavy flavor hadrons ((D) over bar, (D) over bar*), (Lambda c, Sigma c, and Sigma c*) and (Xi(c),Xi(c)',Xi(c)*). Using the P-c states as inputs to fix the interaction strength of light quark-quark pairs, we reproduce the observed P-cs and T-cc(+) states and predict another narrow T-cc('+) state with quantum numbers [D*D*](J=1)(I=0). If we require a satisfactory description of the T-cc(+) and P-c states simultaneously, our framework prefers the assignments of the P-c(4440) and P-c(4457) as the [Sigma c (D) over bar*](J=1/2)(I=1/2) and [Sigma c (D) over bar*](J=3/2)(I=1/2) states, respectively. We propose the isospin criterion to explain naturally why the experimentally observed T-cc, P-c, and P-cs molecular candidates prefer the lowest isospin numbers. We also predict the loosely bound states for the bottom dihadrons.