Physics Letters B
A data-driven method was applied to Au+Au collisions at √Sɴɴ = 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 | Δ η | > 0.7.
Original Publication Citation
Abdelwahab, N. M., Adamczyk, L., Adkins, J. K., Agakishiev, G., Aggarwal, M. M., Ahammed, Z., . . . Collaboration, S. (2015). Isolation of flow and nonflow correlations by two- and four-particle cumulant measurements of azimuthal harmonics in √Sɴɴ =200 GeV Au+Au collisions. Physics Letters B, 745, 40-47. doi: 10.1016/j.physletb.2015.04.033
Abdelwahab, N. M.; Adamczyk, L.; Adkins, J. K.; Agakishiev, G.; Aggarwal, M. M.; Ahammed, Z.; Alekseev, I.; Alford, J.; Anson, C. D.; Aparin, A.; and Bültmann, S., "Isolation of Flow and Nonflow Correlations by Two and Four Particle Cumulant Measurements of Azimuthal Harmonics in √Sɴɴ = GeV Au+Au Collisions" (2015). Physics Faculty Publications. 56.