A data-driven method was applied to Au+Au collisions at 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 . In 20–30% central Au+Au collisions, the relative flow fluctuation was found to be for particles with transverse momentum less than . The Δη-dependent part, attributed to nonflow correlations, is found to be relative to the flow of the measured second harmonic cumulant at .
Isolation of flow and nonflow correlations by two- and four-particle cumulant measurements of azimuthal harmonics in sNN=200GeV Au+Au collisions
di Ruzza, B.;
2015-01-01
Abstract
A data-driven method was applied to Au+Au collisions at 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 . In 20–30% central Au+Au collisions, the relative flow fluctuation was found to be for particles with transverse momentum less than . The Δη-dependent part, attributed to nonflow correlations, is found to be relative to the flow of the measured second harmonic cumulant at .I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.