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The three pentaquark states, $P_c(4312)$, $P_c(4440)$ and $P_c(4457)$,discovered by the LHCb Collaboration in 2019, can be arranged into a completeheavy quark spin symmetry multiplet of hadronic molecules of$\bar{D}^{(\ast)}\Sigma_{c}^{(\ast)}$. In the heavy quark mass limit, the$\Sigma_{c}^{(\ast)}$ baryons can be related to the doubly charmed tetraquarkstates of isospin 1, i.e., $T_{\bar{c}\bar{c}}^{(\ast)}$($T_{\bar{c}\bar{c}}^{0}$, $T_{\bar{c}\bar{c}}^{1}$, $T_{\bar{c}\bar{c}}^{2}$),via heavy antiquark diquark symmetry, which dictates that the$\bar{D}^{(\ast)}\Sigma_{c}^{(\ast)}$ interactions are the same as the$\bar{D}^{(\ast)}T_{\bar{c}\bar{c}}^{(\ast)}$ interactions up to { heavyantiquark diquark symmetry} breakings. In this work, we employ thecontact-range effective field theory to systematically study the$\bar{D}^{(\ast)}T_{\bar{c}\bar{c}}^{(\ast)}$ systems, and we show theexistence of a complete heavy quark spin symmetry multiplet of hadronicmolecules composed of a doubly charmed tetraquark state and a charmed meson.These are a new kind of hadronic molecules and, if discovered, can lead to abetter understanding of the many exotic hadrons discovered so far. In addition,we summarise the triply charmed hexaquark states formed by differentcombinations of hadrons. In particular, we show that $\bar{\Omega}_{ccc}{p}$system can bind by the Coulomb force, which is analogous to a hydrogenlikeatom.

Hadronic molecules composed of a doubly charmed tetraquark state and a charmed meson