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

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

2009-07-21

arxiv.org/abs/0907.3582v1

Phys.Rev.Lett.103:132301,2009

Physics

Nuclear Physics

Nuclear Experiment

4 pages, including 4 figures

Scientific paper

10.1103/PhysRevLett.103.132301

We report first results on a deep sub-threshold production of the doubly strange hyperon $\Xi^-$ in a heavy-ion reaction. At a beam energy of 1.76A GeV the reaction Ar+KCl was studied with the High Acceptance Di-Electron Spectrometer (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 $\Xi^-/(\Lambda+\Sigma^0)$ production ratio of $(5.6 \pm 1.2 ^{+1.8}_{-1.7})\cdot 10^{-3}$ is significantly larger than available model predictions.

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