Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2009-04-02
Physics
Nuclear Physics
Nuclear Theory
8 pages, 8 figures, 1 tables
Scientific paper
The system size dependence of dihadron azimuthal correlations in ultra-relativistic heavy ion collision is simulated by a multi-phase transport model. The structure of correlation functions and yields of associated particles show clear participant path-length dependences in collision systems with a partonic phase. The splitting parameter ($D$) and Root Mean Square Width ($\Delta \phi_{rms}$) of away side correlation functions increase with collision system size from $^{14}$N+$^{14}$N to $^{197}$Au+$^{197}$Au collisions. The double-peak structure of away side correlation functions can only be formed in sufficient "large" collision systems. These properties provide some hints to study onset of deconfinement, which is related to the QCD phase boundary and QCD critical point, by an energy-size scan.
Cai Xiang-Zhou
Chen Jacqueline H.
Ma Guo Lin
Ma Yong-Ge
Zhang Sheng
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