Recent femtoscopy results from NA49: evidence for a non-Gaussian tail in the 3-dimensional two-pion emission source at SPS
AUTOR(ES)
Chung, P., Danielewicz, P.
FONTE
Brazilian Journal of Physics
DATA DE PUBLICAÇÃO
2007-09
RESUMO
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 two-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 two-pion source function is essentially Gaussian from 20 AGeV to 80 AGeV but it displays significant non-Gaussian tails at 158 AGeV.
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