Near-threshold production of the multi-strange $Ξ^-$ hyperon

Details Near-threshold production of the multi-strange $Ξ^-$ hyperon Near-threshold production of the multi-strange $Ξ^-$ hyperon

2003-02-18

arxiv.org/abs/nucl-ex/0302021v2

Phys.Rev.Lett.91:202301,2003

Physics

Nuclear Physics

Nuclear Experiment

Submitted to PRL

Scientific paper

10.1103/PhysRevLett.91.202301

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.

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