Hidden-charm and bottom meson-baryon molecules coupled with five-quark states

摘要

In this paper, we investigate the hidden-charm pentaquarks as$\bar{D}^{(\ast)}\Lambda_{\rm c}$ and $\bar{D}^{(\ast)}\Sigma^{(\ast)}_{\rm c}$molecules coupled to the five-quark states. Furthermore, we extend ourcalculations to the hidden-bottom sector. The coupling to the five-quark statesis treated as the short range potential, where the relative strength for themeson-baryon channels is determined by the structure of the five-quark states.We found that resonant and/or bound states appear in both the charm and bottomsectors. The five-quark state potential turned out to be attractive and, forthis reason, it plays an important role to produce these states. In the charmsector, we need the five-quark potential in addition to the pion exchangepotential in producing bound and resonant states, whereas, in the bottomsector, the pion exchange interaction is strong enough to produce states. Thus,from this investigation, it emerges that the hidden-bottom pentaquarks are morelikely to form than their hidden-charm counterparts; for this reason, wesuggest that the experimentalists should look for states in the bottom sector.