Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-09-07
Phys.Rev.C80:044908,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
10 pages, 9 figures
Scientific paper
10.1103/PhysRevC.80.044908
We examine the characteristic quantities of pion-emitting sources extracted by model-independent imaging analysis in relativistic heavy ion collisions. The moments of the spatial separation of pion pair emission can provide the characteristic information about the source geometry and coherence. They are better for describing the non-Gaussian sources with granular and core-halo structures. An improved granular source model of quark-gluon plasma droplets can reproduce the main characteristics of the two-pion correlation functions and source functions in the experiment of $\sqrt{s_{\rm NN}}=200$ GeV Au+Au collisions. The transverse-momentum dependence of the normalized first-order moments of the separation for the granular source is consistent with that of the usual interferometry results of source radii, after taking into account the Lorentz contraction in the direction of transverse momentum of pion pair.
Ren Yan-Yu
Yang Zhi-Tao
Zhang Wei-Ning
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