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Model comparison for initial density fluctuations in high-energy heavy-ion collisions

Four models for the initial conditions of a fluid dynamic description of high-energy heavy-ion collisions are analyzed and compared. We study expectation values and event-by-event fluctuations in the initial transverse energy density profiles from Pb-Pb collisions. Specifically, introducing a Fourie...

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Main Authors: Flörchinger, Stefan (Author) , Grossi, Eduardo (Author) , Vahid Yousefnia, Kianusch (Author)
Format: Article (Journal)
Language:English
Published: 30 November 2020
In: Physical review
Year: 2020, Volume: 102, Issue: 5
ISSN:2469-9993
DOI:10.1103/PhysRevC.102.054914
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevC.102.054914
Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevC.102.054914
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Author Notes:Stefan Floerchinger, Eduardo Grossi, and Kianusch Vahid Yousefnia

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520 |a Four models for the initial conditions of a fluid dynamic description of high-energy heavy-ion collisions are analyzed and compared. We study expectation values and event-by-event fluctuations in the initial transverse energy density profiles from Pb-Pb collisions. Specifically, introducing a Fourier-Bessel mode expansion for fluctuations, we determine expectation values and two-mode correlation functions of the expansion coefficients. The analytically solvable independent point-sources model is compared to an initial-state model based on Glauber theory and two models based on the color glass condensate framework. We find that the large-wavelength modes of all investigated models show universal properties for central collisions and also discuss to what extent general properties of initial conditions can be understood analytically. 
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