Centrality dependence of hyperon global polarization in Au+Au collisions at RHIC

Details Centrality dependence of hyperon global polarization in Au+Au collisions at RHIC Centrality dependence of hyperon global polarization in Au+Au collisions at RHIC

2007-01-22

arxiv.org/abs/nucl-ex/0701034v1

J.Phys.G34:S1099-1102,2007

Physics

Nuclear Physics

Nuclear Experiment

Talk given at QM 2006, The 19th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions, November 14-20, 200

Scientific paper

10.1088/0954-3899/34/8/S164

We present the centrality dependence of Lambda and Anti-Lambda hyperon global polarization in Au+Au collisions at sqrt{s_NN}=62 GeV and 200 GeV measured with the STAR detector at RHIC. Within the precision of the measurement, we observe no centrality dependence of Lambda and Anti-Lambda hyperon global polarization and within our acceptance it is consistent with zero. Different sources of systematic uncertainties (feed down effects, spin precession) are discussed and estimated. The obtained upper limit, |P_{Lambda,Anti-Lambda}| < 0.02, is compared to theoretical predictions discussed recently in literatures.

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