The molecular nature of some exotic hadrons

A. Ramos, A. Feijoo, Q. Llorens +1

The exciting discovery by LHCb of the $P_c(4312{)}^{+}$ and $P_c(4450{)}^{+}$ pentaquarks, or the suggestion of a tetraquark nature for the $Z_c(3900)$ state seen at BESIII and Belle, have…