Quark exchange effects in single flavored dibaryons

Abstract

We reveal the quark exchange effects related to both the kinetic energy and various interactions in the single flavored dibaryon bound states with $^1S_0$ in the quark models. The hadron covalent bond can be established by the shared identical quarks due to the quark exchange effect between two colorless baryons. Such hadron covalent bond plays a decisive role in the deuteronlike di-$\Omega_{ccc}$ and di-$\Omega_{bbb}$ covalent molecule states. The $\sigma$-meson exchange is indispensable in the deuteronlike di-$\Delta^{++}$ and compact di-$\Omega$ states. The hadron covalent bond clearly appears in the di-$\Delta^{++}$ state but is hidden in the di-$\Omega$ state. The chromomagnetic interaction is always repulsive in the di-$\Delta^{++}$, di-$\Omega$, di-$\Omega_{ccc}$, and di-$\Omega_{bbb}$ states. The color-electric interaction is strongly attractive in the di-$\Omega$ state but weakly attractive or repulsive in the di-$\Delta^{++}$, di-$\Omega_{ccc}$, and di-$\Omega_{bbb}$ states.