Dynamically Generated $\Xi (1690)$

TL;DR

This paper demonstrates that the $ ext{Xi}(1690)$ resonance can be understood as a molecular state generated dynamically through coupled-channel interactions in a chiral unitary framework, aligning well with experimental observations.

Contribution

The study introduces a coupled-channel chiral unitary approach to generate the $ ext{Xi}(1690)$ resonance dynamically, providing new insights into its molecular nature.

Findings

$ ext{Xi}(1690)$ appears near the $ar{K} ext{Sigma}$ threshold.

The resonance is well reproduced by the model.

The $ ext{Xi}(1690)$ is interpreted as a $ar{K} ext{Sigma}$ molecular state.

Abstract

We show that the $\Xi (1690)$ resonance can be dynamically generated in the $s$-wave $\bar{K} \Sigma$-$\bar{K} \Lambda$-$\pi \Xi$-$\eta \Xi$ coupled-channels chiral unitary approach. In our model, the $\Xi (1690)$ resonance appears near the $\bar{K} \Sigma$ threshold as a $\bar{K} \Sigma$ molecular state and the experimental data are reproduced well. We discuss properties of the dynamically generated $\Xi (1690)$.