Dibaryons: Molecular versus compact hexaquarks

Hexaquarks constitute a natural extension of complex quark systems, just as tetra-and pentaquarks do.To this end, the current status of d*(2380) in both experiment and theory is reviewed. Recent high-precision measurements in the nucleon-nucleon channel and analyses thereof have established d*(2380) as an indisputable resonance in the long-sought dibaryon channel. Important features of this I(J~P) = 0(3~+) state are its narrow width and deep binding relative to the ?(1232)?(1232) threshold. Its decay branchings favor theoretical calculations predicting a compact hexaquark nature of this state. We review the current status of experimental and theoretical studies on d*(2380) as well as new physics aspects it may bring in future. In addition, we review the situation at the ?(1232)N and N*(1440)N thresholds, where evidence for a number of resonances of presumably molecular nature has been found – similar to the situation in charmed and beauty sectors. Finally, we briefly discuss the situation of dibaryon searches in the flavored quark sectors.