Five-flavor pentaquarks and other light- and heavy-flavor symmetry partners of the LHCb hidden-charm pentaquarks

The discovery of three pentaquark peaks -- the $P_c(4312)$, $P_c(4440)$ and $P_c(4457)$ by LHCb collaboration has a series interesting consequences for hadron spectroscopy. If these hidden-charm objects are indeed hadronic molecules, as suspected, they will be constrained heavy-flavor SU(3)-flavor symmetries. combination two symmetries imply existence five-flavor pentaquarks with quark content $\bar{b} c s d u$ $b \bar{c} u$, that is, contain each five flavors hadronize. In addition, from symmetry alone we expect light-flavor partners $P_c$ strangeness $S=-1$ $S=-2$. resulting structure molecular is analogous to light-baryon octet can label $P_{Q' \bar{Q}}^N$, \bar{Q}}^{\Lambda}$, \bar{Q}}^{\Sigma}$, \bar{Q}}^{\Xi}$ depending on their heavy- light-quark (with $N$, $\Lambda$, $\Sigma$, $\Xi$ member which resembles $Q'$, $\bar Q$ heavy quark-antiquark pair). total predict $45$ new alone, extend up $109$ undiscovered states if also consider heavy-quark spin symmetry. an isoquartet ($I={3/2}$) ever observed, this in turn second multiplet resembling decuplet: \bar{Q}}^{\Delta}$, \bar{Q}}^{\Sigma^*}$, \bar{Q}}^{\Xi^*}$, \bar{Q}}^{\Omega}$.