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 $\bar{K}{\Xi }^{\ast }$, $\eta \Omega$ 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 $\bar{K}{\Xi }^{\ast }$ channel, that can be observed in the $\Omega (2012)\to \bar{K}\pi \Xi$ decay which is incorporated automatically in our chiral unitary approach via the use of the spectral function of ${\Xi }^{\ast }$ in the evaluation of the $\bar{K}{\Xi }^{\ast }$ loop function.

Comments: 11 pages, 8 figures