Spatial anisotropy: a method to study anisotropic flow in heavy ion collisions

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CUI Xiang-Li, LV Yan, WANG Xiao-Lian and PENG Ru. Spatial anisotropy: a method to study anisotropic flow in heavy ion collisions[J]. Chinese Physics C, 2011, 35(5): 471-474. doi: 10.1088/1674-1137/35/5/013
CUI Xiang-Li, LV Yan, WANG Xiao-Lian and PENG Ru. Spatial anisotropy: a method to study anisotropic flow in heavy ion collisions[J]. Chinese Physics C, 2011, 35(5): 471-474.  doi: 10.1088/1674-1137/35/5/013 shu
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Received: 2010-07-21
Revised: 2010-11-16
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Spatial anisotropy: a method to study anisotropic flow in heavy ion collisions

Abstract: We introduce a method to study anisotropic flow parameter vn as a collective probe to Quark Gluon Plasma in relativistic heavy ion collisions. The emphasis is put on the use of the Fourier expansion of initial spatial azimuthal distributions of participant nucleons in the overlapped region. The coefficients εn of Fourier expansion are called the spatial anisotropy parameter for the n-th harmonic. We propose that collective dynamics can be studied by vn/εn. In this paper, we will discuss in particular the second (n=2) and the fourth (n=4) harmonics.

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