Constraining models of initial conditions with elliptic and triangular flow data

Abstract

We carry out a combined analysis of elliptic and triangular flow data using viscous relativistic hydrodynamics. We show that these data allow to put tight constraints on models of the early dynamics of a nucleus-nucleus collision. Specifically, the rms values of the initial ellipticity ${\epsilon }_2$ and the initial triangularity ${\epsilon }_3$ are constrained to lie within a narrow band for each centrality. We use these constraints as a filter for existing Monte-Carlo models of initial state, and provide a simple test that can be performed on any candidate model to determine its compatibility with data.

7 pages, 2 figures. v2: Minor modifications

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