Hydrodynamic response in simulations within a multiphase transport model

TL;DR

This paper uses a multiphase transport model to simulate flow signatures in high-energy Pb-Pb collisions, analyzing flow fluctuations and response relations, and finds consistency with hydrodynamic models and insensitivity to nonflow effects.

Contribution

It demonstrates that the AMPT model reproduces flow fluctuations and response relations similar to hydrodynamic models in heavy-ion collisions.

Findings

Flow fluctuations are characterized by cumulant ratios and skewness.

The linear and cubic response relations between v2 and ε2 are consistent with hydrodynamic predictions.

The response relation is insensitive to nonflow effects.

Abstract

We carry out simulations using a multiphase transport (AMPT) model to describe the observed flow signatures in $\sqrt{s_{NN}}=2.76$ TeV Pb-Pb collisions. Especially, we calculate the flow fluctuations of $v_2$ in terms of cumulant ratios and the standardized skewness. Based on event-by-event AMPT simulations, we study the linear and cubic response relation between $v_2$ and $\varepsilon_2$. We found that the observed response relation is compatible to what has been noticed in hydrodynamic modelings, with similar dependence on shear viscosity. Besides, this response relation is not sensitive to nonflow effects.