Abstract
The NA49 experiment has acquired a huge data set of Pb+Pb events over a broad range of energy at CERN SPS. This high statistics data set, coupled with a state-of-the-art analysis technique, allows for the first model-independent extraction of 3D two-pion emission sources at SPS energies. These sources provide new insights into the nature of a long-range source previously reported by PHENIX at RHIC. The new results indicate that the pion source displays significant non-Gaussian tails in the longitudinal direction at 40 and 158 A GeV and in the outward direction at 158 A GeV.
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