Multi-strange particle production in relativistic heavy ion collisions at $\sqrt{s_{NN}}=62.4$ GeV

We present preliminary STAR results on measurements of multi-strange particles $Ξ$, $Ω$ and their anti-particles from Au+Au and Cu+Cu at $\sqrt{s_{NN}}=62.4$ GeV collisions. In order to better understand the role of strangeness enhancement in nucleus-nucleus collisions and its scaling properties with system size, we compare the results from Au+Au and Cu+Cu reactions for different event centrality classes. Strangeness enhancement is discussed in the context of multi-strange to pion ratios. Finally, $Ω/ϕ$ ratio is shown for different systems and energies for a systematic study.

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