Strangeness Enhancement in Cu+Cu and Au+Au Collisions at \sqrt{s_{NN}} = 200 GeV

The STAR collaboration
Agakishiev, G. , Aggarwal, M.M. , Ahammed, Z. , Alakhverdyants, A.V. , Alekseev, I. , Alford, J. , Anderson, B.D. , Anson, C.D. , Arkhipkin, D. , Averichev, G.S.
Phys.Rev.Lett. 108 (2012) 072301, 2012.

Abstract (data abstract)
BNL-RHIC. We report new STAR measurements of mid-rapidity yields for the $\Lambda$, $\bar{\Lambda}$, $K^0_S$, $\Xi^-$, $\bar{\Xi}^+$, $\Omega^-$, $\bar{\Omega}^+$ particles in Cu+Cu collisions at $\sqrt{s_{NN}} = 200$ GeV, and mid-rapidity yields for the $\Lambda$, $\bar{\Lambda}$, $K^0_S$ particles in Au+Au at $\sqrt{s_{NN}} = 200$ GeV. We show that at a given number of participating nucleons, the production of strange hadrons is higher in Cu+Cu collisions than in Au+Au collisions at the same center-of-mass energy. We find that aspects of the enhancement factors for all particles can be described by a parameterization based on the fraction of participants that undergo multiple collisions.

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