Hidden-charm meson-baryon molecules with a short-range attraction from five quark states

Abstract

We investigate the exotic baryons as $\bar{D}^{(\ast)}\Lambda_{\rm c}$ and $\bar{D}^{(\ast)}\Sigma^{(\ast)}_{\rm c}$ molecules coupled to the compact five-quark ($5q$) states. The coupling to the $5q$ state is introduced by the contact term, where the relative strength for the meson-baryon channels is determined by the spin structure of the $5q$ states. We also introduce the one pion exchange potential (OPEP). Resonant and/or bound states are found close to the hidden-charm meson-baryon thresholds. The OPEP is not strong enough to produce a state. The states are obtained, when the $5q$ potential with the finite coupling strength is introduced. The spectrum structure is given by the spin configuration of the $5q$ states.