Global polarization measurement in Au+Au collisions

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Abstract

The system created in noncentral relativistic nucleus-nucleus collisions possesses large orbital angular momentum. Because of 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 Λ and Λ̄ hyperon global polarization measurements in Au+Au collisions at sNN=62.4 and 200 GeV performed with the STAR detector at the BNL Relativistic Heavy Ion Collider (RHIC). The observed global polarization of Λ and Λ̄ hyperons in the STAR acceptance is consistent with zero within the precision of the measurements. The obtained upper limit, |PΛ,Λ̄|≤0.02, is compared with the theoretical values discussed recently in the literature.

Original languageEnglish
Article number024915
JournalPhysical Review C - Nuclear Physics
Volume76
Issue number2
DOIs
Publication statusPublished - Aug 29 2007

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All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

Cite this

Abelev, B. I., Aggarwal, M. M., Ahammed, Z., Anderson, B. D., Arkhipkin, D., Averichev, G. S., ... Zuo, J. X. (2007). Global polarization measurement in Au+Au collisions. Physical Review C - Nuclear Physics, 76(2), [024915]. https://doi.org/10.1103/PhysRevC.76.024915