Quark Matter 2005 Conference   Quark Matter 2005 Conference

Evidence for a long-range pion emission source in Au+Au Collisions at sqrt(sNN) = 200 GeV

Dr. Paul Chung

Collaboration: PHENIX


A deconfined phase of nuclear matter is expected to be formed at the high energy densities created in Au+Au collisions at RHIC. The presence of a large space-time extent of particle emission is an important constraint in understanding the nature of this phase transition. The PHENIX experiment at RHIC, has recently acquired ~ 1.5 billion minimum bias Au+Au events at sqrt(s_NN)=200GeV during the year-2004. This high statistics data set allows for the extraction of 3D emission sources for various particle types. These in turn afford a window into the evolution dynamics of the high energy density nuclear matter. A recent analysis of the data using 3D Source Imaging technique has revealed a previously undetected long-range structure in the two-pion source image. The presentation will focus on this new finding and provide details on the 3-Dimensional source shapes for pions, kaons and protons with comparisons to HBT parameters for systematic variation in kT, centrality and reaction plane.

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