2008/08/31 by Qingfeng Li, Marcus Bleicher
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #nucl-th
paper · pdf · doi:10.1088/0954-3899/36/1/015111
published as J.Phys.G36:015111,2009 · 18 pages, 6 figures. To be published in J.Phys. G
arxiv created 2008/11/05 · openalex publication_date 2008/11/11 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30
Hanbury-Brown–Twiss (HBT) correlations of π − –π − pairs at FAIR/AGS energies are investigated by using the UrQMD transport model and the CRAB analyzing program. Three different possible sources (treatment of resonance lifetimes, a soft equation of state and non-Gaussian effects) to understand the HBT R O / R S puzzle are investigated. First, we find that different treatments of the resonance decay time cannot resolve the HBT time-related puzzle, however it can modify the HBT radii at low transverse momenta to some extent to explain the data slightly. Second, with a soft equation of state with momentum dependence, the measured transverse momentum-dependent HBT radii and the R O / R S ratio can be described fairly well. Third, non-Gaussian effects are visible in the calculated correlation function. Using the Edgeworth expansion, one finds that the non-Gaussian effect is strongest in the longitudinal direction and weakest in the sideward direction.