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
Phys. Lett. B 745 (2015) 40 A data-driven method was applied to measurements of Au+Au collisions at $\sqrt{s_{_{\rm NN}}} =$ 200 GeV made with the STAR detector at RHIC to isolate pseudorapidity distance $\Delta\eta$-dependent and $\Delta\eta$-independent correlations by using two- and four-particle...
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Format | Journal Article |
Language | English |
Published |
06.09.2014
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Subjects | |
Online Access | Get full text |
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Summary: | Phys. Lett. B 745 (2015) 40 A data-driven method was applied to measurements of Au+Au collisions at
$\sqrt{s_{_{\rm NN}}} =$ 200 GeV made with the STAR detector at RHIC to isolate
pseudorapidity distance $\Delta\eta$-dependent and $\Delta\eta$-independent
correlations by using two- and four-particle azimuthal cumulant measurements.
We identified a component of the correlation that is $\Delta\eta$-independent,
which is likely dominated by anisotropic flow and flow fluctuations. It was
also found to be independent of $\eta$ within the measured range of
pseudorapidity $|\eta|<1$. The relative flow fluctuation was found to be $34\%
\pm 2\% (stat.) \pm 3\% (sys.)$ for particles of transverse momentum $p_{T}$
less than $2$ GeV/$c$. The $\Delta\eta$-dependent part may be attributed to
nonflow correlations, and is found to be $5\% \pm 2\% (sys.)$ relative to the
flow of the measured second harmonic cumulant at $|\Delta\eta| > 0.7$. |
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DOI: | 10.48550/arxiv.1409.2043 |