Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2012-03-15
Physics
Nuclear Physics
Nuclear Theory
5 pages, 5 figures. Clarify some discussions in the introduction and a reference to ALICE data is added
Scientific paper
The anisotropy associated with the initial dipole asymmetry in heavy ion collisions is studied via the two-particle relative azimuthal azimuthal angle (\Delta\phi=\phi^a-\phi^b) correlations, within a multi-phase transport model. For a broad selection of centrality, transverse momenta (pT^{a,b}) and pseudorapidity (\eta^{a,b}), a fitting method is used to decompose the anisotropy into a rapidity-even component, characterized by the Fourier coefficient v1, and a global momentum conservation component. The extracted v1 values are negative for pT<=0.7-0.9 GeV, reach a maximum at 2-3 GeV, and decreases at higher pT. The v1 values vary weakly with \eta and centrality, but increases with collision energy and parton cross-section. The extracted global momentum conservation component is found to depend on \Delta\eta= \eta^a-\eta^b for \Delta\eta<3.
Jia Jiangyong
Mohapatra Soumya
Radhakrishnan Sooraj K.
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