Isolation of flow and nonflow correlations by two- and four-particle cumulant measurements of azimuthal harmonics in √s[subscript NN] = 200 GeV Au+Au collisions
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Abdelwahab-2015-Isolation of flow an.pdf
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Author(s)
Stevens, Justin
van Nieuwenhuizen, Gerrit J
Date Issued
April 2015
Journal
Physics Letters B
Publisher
Elsevier
Citation
Abdelwahab, N. M., et al. “Isolation of Flow and Nonflow Correlations by Two- and Four-Particle Cumulant Measurements of Azimuthal Harmonics in √s[subscript NN] = 200 GeV Au+Au Collisions.” Physics Letters B 745 (May 2015): 40–47.
Version
Final published version
Abstract
A data-driven method was applied to Au+Au collisions a t√s[subscript NN] = 200 GeV made with the STAR detector at RHIC to isolate pseudorapidity distance Δη-dependent and Δη-independent correlations by using two- and four-particle azimuthal cumulant measurements. We identified a Δη-independent component of the correlation, which is dominated by anisotropic flow and flow fluctuations. It was also found to be independent of η within the measured range of pseudorapidity |η| < 1. In 20–30% central Au+Au collisions, the relative flow fluctuation was found to be 34% ± 2%(stat.) ± 3%(sys.) for particles with transverse momentum [subscript pT] less than 2 GeV/c. The Δη-dependent part, attributed to nonflow correlations, is found to be 5% ± 2%(sys.) relative to the flow of the measured second harmonic cumulant at |Δη| > 0.7.
MIT Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1016/j.physletb.2015.04.033
