2007/05/31 by STAR Collaboration, B. I. Abelev, I. Selyuzhenkov · 1 citation
Physics and Astronomy · #nucl-ex
paper · pdf · doi:10.1103/physrevc.76.024915
published as Phys.Rev.C76:024915,2007 · 11 pages, 10 figures, 1 table, minor changes, accepted for publication in Phys. Rev. C
arxiv created 2007/08/02 · arxiv updated 2009/12/01
The system created in non-central relativistic nucleus-nucleus collisions possesses large orbital angular momentum. Due to spin-orbit coupling, particles produced in such a system could become globally polarized along the direction of the system angular momentum. We present the results of Lambda and anti-Lambda hyperon global polarization measurements in Au+Au collisions at sqrtsNN=62.4 GeV and 200 GeV performed with the STAR detector at RHIC. The observed global polarization of Lambda and anti-Lambda hyperons in the STAR acceptance is consistent with zero within the precision of the measurements. The obtained upper limit, |PLambda,anti-Lambda| <= 0.02, is compared to the theoretical values discussed recently in the literature.