Naslov
Isolation of flow and nonflow correlations by two- and four-particle cumulant measurements of azimuthal harmonics in snn=200 GeV Au+Au collisions

Autori
Adamczyk, L. ; ... ; Planinić, Mirko ; ... ; Poljak, Nikola ; ...

Izvornik
Physics letters. B (0370-2693) 745 (2015); 40-47

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

Ključne riječi
STAR ; flow

Sažetak
A data-driven method was applied to Au+Au collisions at View the MathML source made with the STAR detector at RHIC to isolate pseudorapidity distance Δη-dependent and Δη-independent correlations by using two- and four-particle azimuthal cumulant measurements. We identified a Δη-independent component of the correlation, which is dominated by anisotropic flow and flow fluctuations. It was also found to be independent of η within the measured range of pseudorapidity |η|<1 . In 20–30% central Au+Au collisions, the relative flow fluctuation was found to be 34%±2%(stat.)±3%(sys.) for particles with transverse momentum pT less than 2 GeV/c . The Δη -dependent part, attributed to nonflow correlations, is found to be 5%±2%(sys.) relative to the flow of the measured second harmonic cumulant at | Δη|>0.7

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA