Event-by-Event Fluctuations of Azimuthal Particle Anisotropy in Au+Au Collisions at [sqrt]sNN=200  GeV

Event-by-Event Fluctuations of Azimuthal Particle Anisotropy in Au+Au Collisions at [sqrt]sNN=200  GeV

This Letter presents the first measurement of event-by-event fluctuations of the elliptic flow parameter v2 in Au+Au collisions at [sqrt]sNN=200  GeV as a function of collision centrality. The relative nonstatistical fluctuations of the v2 parameter are found to be approximately 40%. The results, i...

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Bibliographic Details
Main Authors: Busza, Wit, Alver, Burak Han, Ballintijn, Maarten, Decowski, Michael P., Gulbrandsen, K., Henderson, C., Kane, J. L., Kulinich, Piotr, Li, W., Reed, C., Stephans, George S. F., Vale, C., Vaurynovich, Siarhei S., Verdier, Robin, Veres, Gabor, Wenger, Edward Allen, Wyslouch, Boleslaw, Loizides, Constantinos, Roland, Christof E, Roland, Gunther M, van Nieuwenhuizen, Gerrit J
Other Authors: Massachusetts Institute of Technology. Department of Physics
Format: Article
Language:en_US
Published: American Physical Society 2010
Online Access:http://hdl.handle.net/1721.1/57493
https://orcid.org/0000-0002-3831-9071
https://orcid.org/0000-0003-3106-4894
https://orcid.org/0000-0001-8983-2169
https://orcid.org/0000-0003-3681-0649
https://orcid.org/0000-0002-4918-5128
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Summary:This Letter presents the first measurement of event-by-event fluctuations of the elliptic flow parameter v2 in Au+Au collisions at [sqrt]sNN=200  GeV as a function of collision centrality. The relative nonstatistical fluctuations of the v2 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 (nonflow 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.

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