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- Title
RECENT FEMTOSCOPY RESULTS FROM NA49:: EVIDENCE FOR NON-GAUSSIAN TAIL IN 3-D PION EMISSION SOURCE AT SPS.
- Authors
PAUL CHUNG; DANIELEWICZ, PAWEL
- Abstract
The NA49 experiment at CERN SPS has acquired a huge data set of Pb+Pb events over a broad range of energy and centrality during the last several years. This high statistics data set, coupled with a state-of-the-art analysis technique, allows for the first model-independent extraction and energy scan of 3D emission sources for pion pairs at SPS energies. These 3D pion emission 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 exhibits significant non-Gaussian tails in the longitudinal direction at 40 and 158 AGeV and in the outward direction at 158 AGeV. The ratio of the spatial extent in the outward compared to the sideward directions indicates a finite non-zero duration for pion emission. The spatial extent in the longidutional direction suggests that pions decouple from the system at ~10 fm/c at 158 AGeV and at ~8 fm/c at 40 AGeV.
- Subjects
COLLISIONS (Nuclear physics); PION-pion interactions; NUCLEAR reactions; PARTICLES (Nuclear physics); NUCLEAR physics; HEAVY ion collisions
- Publication
International Journal of Modern Physics E: Nuclear Physics, 2007, Vol 16, Issue 10, p3286
- ISSN
0218-3013
- Publication type
Article