Spectrum of the molecular hexaquarks

Abstract

We investigate the mass spectra of molecular-type hexaquark states in the dibaryon systems. These systems are composed of the charmed baryons $[\hat{I}{\pounds }_c^{(\ast )}$, $\hat{I}{ž}_c^{(\prime ,\ast )}]$, doubly charmed baryons $[\hat{I}{ž}_{cc}^{(\ast )}]$, and hyperons $[\hat{I}{\pounds }^{(\ast )}$, $\hat{I}{ž}^{(\ast )}]$. We consider all possible combinations of particle-particle and particle-antiparticle pairs, including the S-wave spin multiplets in each combination. We establish the underlying connections among the molecular tetraquarks, pentaquarks, and hexaquarks with the effective quark-level interactions. We find that the existence of molecular states in $D{D}^{\ast }$, $D{\bar{D}}^{\ast }$, and $\hat{I}{\pounds }_c{\bar{D}}^{(\ast )}$ systems leads to the emergence of a large number of deuteron-like hexaquarks in the heavy flavor sectors. Currently, there have been several experimental candidates for molecular tetraquarks and pentaquarks. The experimental search for near-threshold hexaquarks will further advance the establishment of the underlying dynamical picture of hadronic molecules and deepen our understanding of the role of spin-flavor symmetry in near-threshold residual strong interactions.

17 pages, 13 tables