Coupled channels dynamics in the generation of the $\Omega (2012)$ resonance

Abstract

We look into the newly observed $\Omega (2012)$ state from the molecular perspective in which the resonance is generated from the $\bar{K} \Xi^*$, $\eta \Omega$ and $\bar{K} \Xi$ channels. We find that this picture provides a natural explanation of the properties of the $\Omega (2012)$ state. We stress that the molecular nature of the resonance is revealed with a large coupling of the $\Omega (2012)$ to the $\bar{K} \Xi^*$ channel, that can be observed in the $\Omega (2012) \rightarrow \bar{K} \pi \Xi$ decay which is incorporated automatically in our chiral unitary approach via the use of the spectral function of $\Xi^*$ in the evaluation of the $\bar{K} \Xi^*$ loop function.