Λ and Λ¯ polarization in Au-Au collisions at RHIC

Experiments at RHIC have shown that in 200 GeV Au-Au collisions, the Λ and Λ¯ hyperons are produced with very small polarizations (Abelev et al., 2007) [1], almost consistent with zero. These results can be understood in terms of a model that we proposed (Barros and Hama, 2008) [2]. In this Letter, we show how this model may be applied in such collisions, and also will discuss the relation of our results with other models, in order to explain the experimental data.