Global polarization measurement in Au+Au collisions

Abelev, B. I. and Planinić, Mirko and Poljak, Nikola and Zuo, J. X. (STAR Collaboration) (2007) Global polarization measurement in Au+Au collisions. Physical Review C, 76 (2). pp. 24915-10. ISSN 0556-2813

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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 Λ¯ 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 Λ¯ hyperons in the STAR acceptance is consistent with zero within the precision of the measurements. The obtained upper limit, ∣PΛ,Λ¯∣<=0.02, is compared with the theoretical values discussed recently in the literature.

Item Type: Article
Keywords: nucleus nucleus, colliding beams scattering, heavy ion gold Lambda, hadroproduction Lambda, hadronic decay angular distribution Lambda, polarization Antilambda, polarization transverse momentum, dependence impact parameter, dependence polarization, upper limit magnetic detector, STAR experimental results Brookhaven RHIC Coll 200 GeV-cms/nucleon
Date: August 2007
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (2007) by the American Physical Society.
Divisions: Faculty of Science > Department of Physics
Project code: 119-0982887-1006
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 01 Jul 2014 11:03
Last Modified: 01 Jul 2014 11:03

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