Imaging of granular sources in high energy heavy ion collisions

Details Imaging of granular sources in high energy heavy ion collisions Imaging of granular sources in high energy heavy ion collisions

2008-08-18

arxiv.org/abs/0808.2413v4

J.Phys.G36:015113,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages, 6 figures

Scientific paper

10.1088/0954-3899/36/1/015113

We 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

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