Naslov
Global polarization measurement in Au plus Au collisions

Autori
Abelev, B.I. ; ... ; Planinić, Mirko ; Poljak, Nikola ; et.al.

Izvornik
Physical Review C (0556-2813) 76 (2007), 2; 024915-1

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
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

Sažetak
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 sqrt{; ; s_NN}; ; =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, |P_{; ; Lambda, anti-Lambda}; ; | <= 0.02, is compared to the theoretical values discussed recently in the literature.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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