The $\Omega(2012)$ as a hadronic molecule

TL;DR

The paper reviews the $ ext{Ω}(2012)$ baryon as a hadronic molecule, suggesting it is a dynamically generated state from coupled-channel interactions, and discusses alternative explanations for its nature.

Contribution

It provides a molecular perspective on the $ ext{Ω}(2012)$, proposing it as a dynamically generated state from specific coupled-channel interactions and comparing with other models.

Findings

$ ext{Ω}(2012)$ can be described as a $3/2^-$ molecular state.

Coupled-channel interactions of $ar{K} ext{Ξ}(1530)$ and $ ext{η} ext{Ω}$ generate the state.

Alternative explanations for the resonance are also considered.

Abstract

Recently, a new excited baryon state, $\Omega(2012)$, was observed in the invariant mass spectra of $K^-\Xi^0$ and $K^0_S \Xi^-$ by the Belle Collaboration. This state has a narrow width ($\sim 6$ MeV) compared to other baryon states with a similar mass. In this paper, we provide a mini-review on the $\Omega(2012)$ state from the molecular perspective, where it appears to be a dynamically generated state with spin-parity $3/2^-$ from the coupled-channels interactions of the $\bar{K} \Xi(1530)$ and $\eta \Omega$ in $s$-wave and $\bar{K} \Xi$ in $d$-wave. Additionally, alternative explanations for the $\Omega(2012)$ resonance are also discussed.