Elliptic flow analysis in Au+Au collisions at sNN=200GeV : Fluctuations vs non-flow effects
Year: 2005
Type: article
Abstract: The cumulant method is applied to study elliptic flow (${v}_{2}$) in Au+Au collisions at $\sqrt{s}=200A$ GeV, with the UrQMD model. In this approach, the true event plane is known and both the nonflow effects and event-by-event spatial ($\ensuremath{\epsilon}$) and ${v}_{2}$ fluctuations exist. Qualitatively, the hierarchy of ${v}_{2}$s from two-, four-, and six-particle cumulants is consistent with the STAR data; however, the magnitude of ${v}_{2}$ in the UrQMD model is only 60% of the data. We find that the four- and six-particle cumulants are good measures of the real elliptic flow over a wide range of centralities except for the most central and very peripheral events. There the cumulant method is affected by the ${v}_{2}$ fluctuations. In midcentral collisions, the four- and six-particle cumulants are shown to give a good estimation of the true differential ${v}_{2}$, especially at large transverse momentum, where the two-particle cumulant method is heavily affected by the nonflow effects.
Source: Physical Review C
Authors: Xianglei Zhu, Marcus Bleicher, Horst Stöcker
Language: Latvian
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W1998001421