Origin of the mass splitting of elliptic anisotropy in a multiphase transport model

被引:8
作者
Li, Hanlin [1 ,2 ]
He, Liang [2 ]
Lin, Zi-Wei [3 ]
Molnar, Denes [2 ]
Wang, Fuqiang [2 ]
Xie, Wei [2 ]
机构
[1] Wuhan Univ Sci & Technol, Coll Sci, Wuhan 430065, Hubei, Peoples R China
[2] Purdue Univ, Dept Phys & Astron, W Lafayette, IN 47907 USA
[3] E Carolina Univ, Dept Phys, Greenville, NC 27858 USA
关键词
QUARK-GLUON PLASMA; LONG-RANGE; ANGULAR-CORRELATIONS; COLLECTIVE FLOW; PB COLLISIONS; PERSPECTIVE; MATTER; SIDE;
D O I
10.1103/PhysRevC.93.051901
中图分类号
O57 [原子核物理学、高能物理学];
学科分类号
070202 ;
摘要
The mass splitting of elliptic anisotropy (nu(2)) at low transverse momentum is considered as a hallmark of hydrodynamic collective flow. We investigate a multiphase transport (AMPT) model where the nu(2) is mainly generated by an anisotropic escape mechanism, not of the hydrodynamic flow nature, and where mass splitting is also observed. We demonstrate that the nu(2) mass splitting in AMPT is small right after hadronization (especially when resonance decays are included); the mass splitting mainly comes from hadronic rescatterings, even though their contribution to the overall charged hadron nu(2) is small. These findings are qualitatively the same as those from hybrid models that combine hydrodynamics with a hadron cascade. We further show that there is no qualitative difference between heavy ion collisions and small system collisions. Our results indicate that the nu(2) mass splitting is not a unique signature of hydrodynamic collective flow and thus cannot distinguish whether the elliptic flow is generated mainly from hydrodynamics or the anisotropic parton escape.
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页数:5
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