Molecular nature of Pcs(4459) and its heavy quark spin partners

Inspired by the observation of the Pcs(4459) state by LHCb recently, we reexamine the results of the interaction of the J/ψΛ channel with its coupled channels, exploiting the coupled channel unitary approach combined with heavy quark spin and local hidden gauge symmetries. By tuning the only free parameter, we find a pole of (4459.07 + i6.89) MeV below the ... threshold, which was consistent with the mass and width of the Pcs(4459) state. Thus, we assume the Pcs(4459) state to be a ... bound state with the possible degeneracy of ... According to this degeneracy, it would have a two-pole structure, like Pc(4450) before. There is another pole in the ... sector, (4310.53 + i8.23) MeV, corresponding to a deep bound state of ... Furthermore, the previously predicted loosely bound states ... may exist as either bound states or unbound virtual states. We hope that future experiments can search for the... molecular states not only in their dominant decay channels ... but also in the channels J/ψΛ and ηcΛ in order to reveal their different natures.(ProQuest: ... denotes formulae omitted.)