Isolation of Flow and Nonflow Correlations by Two- and Four-Particle Cumulant Measurements of Azimuthal Harmonics in $\sqrt{s_{_{\rm NN}}} =$ 200 GeV Au+Au Collisions - INSPIRE

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Isolation of Flow and Nonflow Correlations by Two- and Four-Particle Cumulant Measurements of Azimuthal Harmonics in $\sqrt{s_{_{\rm NN}}} =$ 200 GeV Au+Au Collisions

STAR

Collaboration

•

N.M. Abdelwahab
(
- WLCAPP, Cairo
)

Sep 6, 2014

8 pages

Published in:

Phys.Lett.B 745 (2015) 40-47

Published: Apr 21, 2015

e-Print:

1409.2043 [nucl-ex]

DOI:

10.1016/j.physletb.2015.04.033

Experiments:

BNL-RHIC-STAR

View in:

reference search18 citations

Citations per year

Abstract: (Elsevier)

A data-driven method was applied to Au+Au collisions at sNN=200 GeV made with the STAR detector at RHIC to isolate pseudorapidity distance Δ η -dependent and Δ η -independent correlations by using two- and four-particle azimuthal cumulant measurements. We identified a Δ η -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 pT less than 2 GeV/c . The Δ η -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 .

Heavy-ion
Flow
Nonflow
fluctuation
particle flow: anisotropy
correlation
rapidity
Brookhaven RHIC Coll
transverse momentum
STAR

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Figures(8)

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