Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2007-02-16
Phys.Rev.Lett.104:142301,2010
Physics
Nuclear Physics
Nuclear Experiment
5 pages, 2 figures, Published in Phys. Rev. Lett.
Scientific paper
10.1103/PhysRevLett.104.142301
This paper presents the first measurement of event-by-event fluctuations of the elliptic flow parameter v_2 in Au+Au collisions at sqrt(s_NN) = 200GeV as a function of collision centrality. The relative non-statistical fluctuations of the v_2 parameter are found to be approximately 40%. The results, including contributions from event-by-event elliptic flow fluctuations and from azimuthal correlations that are unrelated to the reaction plane (non-flow correlations), establish an upper limit on the magnitude of underlying elliptic flow fluctuations. This limit is consistent with predictions based on spatial fluctuations of the participating nucleons in the initial nuclear overlap region. These results provide important constraints on models of the initial state and hydrodynamic evolution of relativistic heavy ion collisions.
Alver B.
for the PHOBOS Collaboration
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