Multi-strange baryon elliptic flow in Au+Au collisions at sqrt(s_NN)= 200 GeV

Details Multi-strange baryon elliptic flow in Au+Au collisions at sqrt(s_NN)= 200 GeV Multi-strange baryon elliptic flow in Au+Au collisions at sqrt(s_NN)= 200 GeV

2005-04-22

arxiv.org/abs/nucl-ex/0504022v1

Phys.Rev.Lett.95:122301,2005

Physics

Nuclear Physics

Nuclear Experiment

6 pages, 3 figures, submitted to PRL

Scientific paper

10.1103/PhysRevLett.95.122301

We report on the first measurement of elliptic flow $v_2(p_T)$ of multi-strange baryons $\Xi+\bar{Xi}$ and $\Omega+\bar{Omega} in heavy-ion collisions. In minimum bias Au+Au collisions at sqrt(s_NN) = 200 GeV, a significant amount of elliptic flow, comparable to other non-strange baryons, is observed for multi-strange baryons which are expected to be particularly sensitive to the dynamics of the partonic stage of heavy-ion collisions. The $p_T$ dependence of $v_2$ of the multi-strange baryons confirms the number of constituent quark scaling previously observed for lighter hadrons. These results support the idea that a substantial fraction of the observed collective motion is developed at the early partonic stage in ultra-relativistic nuclear collisions at RHIC.

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