Dibaryons: Molecular versus Compact Hexaquarks

Abstract

Hexaquarks constitute a natural extension of complex quark systems like also tetra- and pentaquarks do. To this end the current status of $d^{\ast }(2380)$ in both experiment and theory is shortly reviewed. Recent high-precision measurements in the nucleon-nucleon channel and analyses thereof have established $d^{\ast }(2380)$ 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 its deep binding relative to the $\Delta (1232)\Delta (1232)$ 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 $d^{\ast }(2380)$ as well as new physics aspects it may bring in the future. In addition, we review the situation at the $\Delta (1232)N$ and $N^{\ast }(1440)N$ thresholds, where evidence for a number of resonances of presumably molecular nature have 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.

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• Systematics of fully heavy dibaryons
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• Is $d^{\ast }(2380)$ a compact hexaquark state?
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