Eccentricity Fluctuation in Initial Conditions of Hydrodynamics

TL;DR

This paper investigates how fluctuations in initial collision eccentricity influence the elliptic flow in heavy-ion collisions, revealing a modest effect in Au+Au but a significant enhancement in Cu+Cu collisions.

Contribution

It introduces a hybrid model combining hydrodynamics and hadronic transport to analyze eccentricity fluctuations' impact on elliptic flow.

Findings

Eccentricity fluctuations modestly affect Au+Au collisions.

Significantly enhance v_2 in Cu+Cu collisions.

Highlights importance of initial condition fluctuations.

Abstract

We study effects of eccentricity fluctuations on the elliptic flow coefficient v_2 at mid-rapidity in both Au+Au and Cu+Cu collisions at sqrt{s_{NN}}=200 GeV by using a hybrid model that combines ideal hydrodynamics for space-time evolution of the quark gluon plasma phase and a hadronic transport model for the hadronic matter. We find that the effect of eccentricity fluctuation is modest in semicentral Au+Au collisions but significantly enhances v_2 in Cu+Cu collisions.