Origin of the mass splitting of elliptic anisotropy in a multiphase transport model
| Autor: | Li, Hanlin, He, Liang, Lin, Zi-Wei, Molnar, Denes, Wang, Fuqiang, Xie, Wei |
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| Rok vydání: | 2016 |
| Předmět: | |
| Zdroj: | Phys. Rev. C 93, 051901(R) (2016) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevC.93.051901 |
| Popis: | The mass splitting of elliptic anisotropy ($v_2$) at low transverse momentum is considered as a hallmark of hydrodynamic collective flow. We investigate a multiphase transport (AMPT) model where the $v_2$ 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 $v_2$ 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 $v_2$ 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 $v_2$ 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. Comment: 5 pages, 4 figures |
| Databáze: | arXiv |
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