TY - INPR
A1 - Zhu, Xianglei
A1 - Bleicher, Marcus
A1 - StÃ¶cker, Horst
T1 - Elliptic flow analysis at RHIC : fluctuations vs. non-flow effects
N2 - The cumulant method is applied to study elliptic flow (v_2) in Au+Au collisions at sqrt s=200 AGeV, with the UrQMD model. In this approach, the true event plane is known and both the non-flow effects and event-by-event spatial (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 mid-central 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 non-flow effects.
Y1 - 2005
UR - http://publikationen.ub.uni-frankfurt.de/opus4/frontdoor/index/index/docId/3431
UR - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hebis:30-19779
ER -