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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
Gardim, Fernando G. [1] ; Grassi, Frederique [2] ; Ishida, Pedro [2] ; Luzum, Matthew [2] ; Magalhaes, Pablo S. [1] ; Noronha-Hostler, Jacquelyn [3]
Total Authors: 6
Affiliation:
[1] Univ Fed Alfenas, Inst Ciencia & Tecnol, BR-37715400 Pocos De Caldas, MG - Brazil
[2] Univ Sao Paulo, Inst Fis, Rua Matao 1371, BR-05508090 Sao Paulo, SP - Brazil
[3] Rutgers State Univ, Dept Phys & Astron, Piscataway, NJ 08854 - USA
Total Affiliations: 3
Document type: Journal article
Source: Physical Review C; v. 97, n. 6 JUN 29 2018.
Web of Science Citations: 9
Abstract

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 v(n), scaled v(n) distributions, normalized symmetric cumulants, event-plane correlations) as well as most differential observables {[}v(n)(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. (AU)

FAPESP's process: 17/05685-2 - Hadronic physics in high energy nuclear collisions
Grantee:Jun Takahashi
Support type: Research Projects - Thematic Grants
FAPESP's process: 15/00011-8 - Extracting properties of the Quark Gluon Plasma from RHIC and LHC data
Grantee:Frédérique Marie Brigitte Sylvie Grassi
Support type: Regular Research Grants
FAPESP's process: 16/03274-2 - Development of a 3+1 hydrodynamical code for studies of the Quark Gluon Plasma
Grantee:Frédérique Marie Brigitte Sylvie Grassi
Support type: Research Grants - Visiting Researcher Grant - International
FAPESP's process: 15/50438-8 - Observing the minibang through its fluctuation spectrum
Grantee:Frédérique Marie Brigitte Sylvie Grassi
Support type: Regular Research Grants
FAPESP's process: 16/24029-6 - Investigating the strong nuclear interactions under extreme conditions
Grantee:Matthew William Luzum
Support type: Research Grants - Young Investigators Grants