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 \sNN{ 200}, and mid-rapidity yields for the $\Lambda$, $\bar{ \Lambda}$, $K^{ 0}_{ S}$ particles in Au+Au at \sNN{ 200}. 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.
Categories: nucl-ex