Elliptic flow analysis in Au+Au collisions at {radical}(s{sub NN})=200 GeV: Fluctuations vs non-flow effects

Journal Article · Thu Dec 15 04:00:00 EST 2005 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.72.064911· OSTI ID:20771140

Xianglei, Zhu ^[1]; Bleicher, Marcus ^[2]; Stoecker, Horst ^[1]

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1. Frankfurt Institute for Advanced Studies (FIAS), Max-von-Laue-Strasse 1, D-60438 Frankfurt (Germany)
2. Institut fuer Theoretische Physik, Johann Wolfgang Goethe-Universitaet, Max-von-Laue-Strasse 1, D-60438 Frankfurt (Germany)

The cumulant method is applied to study elliptic flow (v{sub 2}) in Au+Au collisions at {radical}(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 ({epsilon}) and v{sub 2} fluctuations exist. Qualitatively, the hierarchy of v{sub 2}s from two-, four-, and six-particle cumulants is consistent with the STAR data; however, the magnitude of v{sub 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{sub 2} fluctuations. In midcentral collisions, the four- and six-particle cumulants are shown to give a good estimation of the true differential v{sub 2}, especially at large transverse momentum, where the two-particle cumulant method is heavily affected by the nonflow effects.

• OSTI ID: 20771140
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 6 Vol. 72; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

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PARTICLE IDENTIFICATION
TRANSVERSE MOMENTUM