Evidence for non-Gaussian tail in 3D pion emission source at the SPS
P Chung (Dept of Chemistry, SUNY Stony Brook, Stony Brook, NY, USA), and P Danielewicz (National Superconducting Cyclotron Laboratory and, Department of Physics, Astronomy, Michigan State University, East Lansing,, MI, USA) (for The NA49 Collaboration)
TL;DR
This study uses high-statistics data from CERN SPS to perform a model-independent analysis of 3D pion emission sources, revealing significant non-Gaussian tails that suggest complex emission dynamics at different energies.
Contribution
It provides the first model-independent energy scan of 3D pion emission sources at SPS energies, uncovering non-Gaussian features in the emission profiles.
Findings
Non-Gaussian tails observed in the longitudinal direction at 40 and 158 AGeV.
Non-Gaussian tails observed in the outward direction at 158 AGeV.
Results offer new insights into the long-range pion emission source.
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 displays significant non-Gaussian tails in the longitudinal direction at 40 and 158 AGeV and in the outward direction at 158 AGeV.
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