AMPT generates high elliptic flow with few-millibarn cross sections due to specific features in initial conditions, interactions, and partonic dynamics, identified via comparisons with the MPC model.
Anisotropic parton escape is the dominant source of azimuthal anisotropy in transport models
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abstract
We trace the development of elliptic anisotropy ($v_2$) via parton-parton collision history in two transport models. The parton $v_2$ is studied as a function of the number of collisions of each parton in Au+Au and $d$+Au collisions at $\sqrt{s_{_{\rm NN}}}=200$ GeV. It is found that the majority of $v_2$ comes from the anisotropic escape probability of partons, with no fundamental difference at low and high transverse momenta. The contribution to $v_2$ from hydrodynamic-type collective flow is found to be small. Only when the parton-parton cross-section is set unrealistically large does this contribution start to take over. Our findings challenge the current paradigm emerged from hydrodynamic comparisons to anisotropy data.
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2019 1verdicts
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How AMPT generates large elliptic flow with small cross sections
AMPT generates high elliptic flow with few-millibarn cross sections due to specific features in initial conditions, interactions, and partonic dynamics, identified via comparisons with the MPC model.