Sensitivity of observables to coarse-graining size in heavy-ion collisions

Fernando G. Gardim, Frédérique Grassi, Pedro Ishida, Matthew Luzum, Pablo S. Magalhães, Jacquelyn Noronha-Hostler

Research output: Contribution to journalArticlepeer-review

25 Scopus citations


An open question in the field of heavy-ion collisions is to what extent the size of initial inhomogeneities in the system affects measured observables. Here we present a method to smooth out these inhomogeneities with minimal effect on global properties, to quantify the effect of short-range features of the initial state. We show a comparison of hydrodynamic predictions with original and smoothened initial conditions for four models of initial conditions and various observables. Integrated observables (integrated vn, scaled vn distributions, normalized symmetric cumulants, event-plane correlations) as well as most differential observables [vn(pT)] show little dependence on the inhomogeneity sizes and instead are sensitive only to the largest-scale geometric structure. However, other differential observables such as the flow factorization ratio and subleading principal components are more sensitive to the granularity and could be a good tool to probe the short-scale dynamics of the initial stages of a heavy-ion collision, which are not currently well understood.

Original languageEnglish (US)
Article number064919
JournalPhysical Review C
Issue number6
StatePublished - Jun 29 2018

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


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