Reanalysis of the most strange dibaryon within constituent quark models

TL;DR

This paper reanalyzes the most strange dibaryon $ ext{ extOmega} ext{ extOmega}$ using quark models, confirming its bound state with specific quantum numbers and exploring the effects of different interactions and channels on its stability.

Contribution

It provides a comparative analysis of the $ ext{ extOmega} ext{ extOmega}$ dibaryon in two quark models, highlighting the conditions for its binding and the impact of hidden-color channels and meson exchanges.

Findings

$ ext{ extOmega} ext{ extOmega}$ with $J^{P}=0^{+}$ is bound in both models.

Other quantum states are unbound.

The binding energy varies significantly between models.

Abstract

The most strange dibaryon $\Omega\Omega$ with quantum numbers $S=-6$, $I=0$, and $J^{P}=0^{+},~1^{-},~2^{+},~3^{-}$ is reanalyzed in the framework of quark delocalization color screening model (QDCSM) and chiral quark model (ChQM). The $\Omega\Omega$ dibaryon with $J^{P}=0^{+}$ is bound, and the one with other quantum numbers $J^{P}=1^{-},~2^{+},~3^{-}$ are all unbound in our calculation. The low-energy scattering phase shifts, the scattering length, and the effective range of the $\Omega\Omega$ dibaryon with $J^{P}=0^{+}$ also support the existence of such strange dibaryon. This dibaryon is showed to be a shallow bound state in QDCSM, while the binding energy becomes much larger in the ChQM by including the effect of the hidden-color channel coupling. And the scalar nonet meson-exchange in the ChQM also provides more attraction for the $\Omega\Omega$ system. Experimental search for such most strange dibaryon will provide much information for understanding the hadron-hadron interactions in different quark models.