Near-threshold production of the multi-strange ${\Xi }^{-}$ hyperon

Abstract

The yield for the multi-strange ${\Xi }^{-}$ hyperon has been measured in 6 AGeV Au+Au collisions via reconstruction of its decay products ${\pi }^{-}$ and $\Lambda$, the latter also being reconstructed from its daughter tracks of ${\pi }^{-}$ and p. The measurement is rather close to the threshold for ${\Xi }^{-}$ production and therefore provides an important test of model predictions. The measured yield for ${\Xi }^{-}$ and $\Lambda$ are compared for several centralities. In central collisions the ${\Xi }^{-}$ yield is found to be in excellent agreement with statistical and transport model predictions, suggesting that multi-strange hadron production approaches chemical equilibrium in high baryon density nuclear matter.

Submitted to PRL

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