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.
Dissipation and elliptic flow at RHIC
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abstract
We compare elliptic flow evolution from ideal hydrodynamics and covariant parton transport theory, and show that, for conditions expected at RHIC, dissipation significantly reduces elliptic flow even for extreme parton cross sections and/or densities sigma_gg * dN/d\eta(b=0) ~ 45 mb * 1000. The difference between transport and hydrodynamic elliptic flow is established rather early during the evolution of the system, but the buildup of elliptic flow is surprisingly insensitive to the choice of the initial (formation or thermalization) time in both models.
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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.