Imaging of granular sources in high energy heavy ion collisions

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dc.creatorYang, Zhi-Tao
dc.creatorZhang, Wei-Ning
dc.creatorHuo, Lei
dc.creatorZhang, Jing-Bo
dc.date2008-08-18
dc.date2008-11-13
dc.date.accessioned2026-07-07T12:15:16Z
dc.date.available2026-07-07T12:15:16Z
dc.descriptionWe investigate the source imaging for a granular pion-emitting source model in high energy heavy ion collisions. The two-pion source functions of the granular sources exhibit a two-tiered structure. Using a parametrized formula of granular two-pion source function, we examine the two-tiered structure of the source functions for the imaging data of Au+Au collisions at Alternating Gradient Synchrotron (AGS) and Relativistic Heavy Ion Collider (RHIC). We find that the imaging technique introduced by Brown and Danielewicz is suitable for probing the granular structure of the sources. Our data-fitting results indicate that there is not visible granularity for the sources at AGS energies. However, the data for the RHIC collisions with the selections of $40 < {\rm centrality} < 90%$ and $0.20<k_{\rm T}<0.36$ GeV/c are better described by the model with granular emission than that of one Gaussian. The model with granular source has more parameters than the simple Gaussian, hence can describe more complicated shapes.
dc.description14 pages, 6 figures
dc.identifierhttps://arxiv.org/abs/0808.2413
dc.identifierhttp://arxiv.org/abs/0808.2413
dc.identifierJ.Phys.G36:015113,2009
dc.identifierdoi:10.1088/0954-3899/36/1/015113
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/211454
dc.subjectHigh Energy Physics - Phenomenology
dc.titleImaging of granular sources in high energy heavy ion collisions
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