A model comparison of resonance lifetime modifications, a soft equation of state and non-Gaussian effects on $π-π$ correlations at FAIR/AGS energies

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dc.creatorLi, Qingfeng
dc.creatorBleicher, Marcus
dc.date2008-08-26
dc.date2008-11-05
dc.date.accessioned2026-07-07T12:15:21Z
dc.date.available2026-07-07T12:15:21Z
dc.descriptionHBT 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. Firstly, we find that different treatments of the resonance decay time can not 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. Secondly, with a soft equation of state with momentum dependence, the measured transverse momentum dependent HBT radii and $R_O/R_S$ ratio can be described fairly well. Thirdly, 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.
dc.description18 pages, 6 figures. To be published in J.Phys. G
dc.identifierhttps://arxiv.org/abs/0808.3457
dc.identifierhttp://arxiv.org/abs/0808.3457
dc.identifierJ.Phys.G36:015111,2009
dc.identifierdoi:10.1088/0954-3899/36/1/015111
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/211472
dc.subjectNuclear Theory
dc.titleA model comparison of resonance lifetime modifications, a soft equation of state and non-Gaussian effects on $π-π$ correlations at FAIR/AGS energies
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