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We report first results on a deep sub-threshold production of the doublystrange hyperon $\Xi^-$ in a heavy-ion reaction. At a beam energy of 1.76A GeVthe reaction Ar+KCl was studied with the High Acceptance Di-ElectronSpectrometer (HADES) at SIS18/GSI. A high-statistics and high-purity $\Lambda$sample was collected, allowing for the investigation of the decay channel$\Xi^- \to \Lambda \pi^-$. The deduced $\Xi^-/(\Lambda+\Sigma^0)$ productionratio of $(5.6 \pm 1.2 ^{+1.8}_{-1.7})\cdot 10^{-3}$ is significantly largerthan available model predictions.

Deep sub-threshold $\Xi^-$ production in Ar+KCl reactions at 1.76A GeV