Constraints on models for the initial collision geometry in ultra relativistic heavy ion collisions

Details Constraints on models for the initial collision geometry in ultra relativistic heavy ion collisions Constraints on models for the initial collision geometry in ultra relativistic heavy ion collisions

2010-02-03

arxiv.org/abs/1002.0649v2

Physics

Nuclear Physics

Nuclear Experiment

4 pages, 3 figs - version accepted for publication

Scientific paper

Monte Carlo (MC) simulations are used to compute the centrality dependence of the collision zone eccentricities ($\epsilon_{2,4}$), for both spherical and deformed ground state nuclei, for different model scenarios. Sizable model dependent differences are observed. They indicate that measurements of the $2^{\text{nd}}$ and $4^{\text{th}}$ order Fourier flow coefficients $v_{2,4}$, expressed as the ratio $\frac{v_4}{(v_2)^2}$, can provide robust constraints for distinguishing between different theoretical models for the initial-state eccentricity. Such constraints could remove one of the largest impediments to a more precise determination of the specific viscosity from precision $v_{2,4}$ measurements at the Relativistic Heavy Ion Collider (RHIC).

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