Can $\Omega(2012)$ be explained as a molecular state?

TL;DR

This study investigates the nature of the $ ext{Omega}(2012)$ baryon using quark models, finding it unlikely to be a molecular state and predicting two other resonance states for future experimental search.

Contribution

The paper provides a dynamical calculation of pentaquark systems with specific quark content, offering insights into the molecular nature of $ ext{Omega}(2012)$ and predicting new resonance states.

Findings

$ ext{Omega}(2012)$ is not a $ ext{Xi}^*ar{K}$ molecular state.

Two resonance states $ ext{Xi}^*ar{K}^*$ are predicted with specific masses and widths.

Predicted states are promising candidates for future experimental detection.

Abstract

We conduct a dynamical calculation of pentaquark systems with quark contents $sssu\bar{u}$ in the framework of two quark models: the chiral quark model(ChQM) and quark delocalization color screening model(QDCSM). The effective potentials between baryon and meson clusters are given, and the possible bound states are also investigated. Besides, the study of the scattering process of the open channels is also performed to look for any resonance state. The results show that the $\Omega(2012)$ is not suitable for the interpretation as a $\Xi^{*} \bar{K}$ molecular state in present quark models. Two resonance states: the $\Xi^{*}\bar{K}^{*}$ with $IJ^{P}=0\frac{3}{2}^{-}$ ($M=2328\sim2374$ MeV, $\Gamma=57\sim65.5$ MeV) and $IJ^{P}=1\frac{3}{2}^{-}$ ($M=2341\sim2386$ MeV, $\Gamma=31.5\sim100$ MeV) are obtained in both QDCSM and ChQM, which indicates that both of these two states are more possible to be existed and worthy of being searched by future experiments.