Isolation of flow and nonflow correlations by two- and four-particle cumulant measurements of azimuthal harmonics in Au+Au collisions
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 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 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. (author)
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY (United States). Relativistic Heavy Ion Collider (RHIC)
- Sponsoring Organization:
- USDOE Office of Science (SC), Nuclear Physics (NP); USDOE Office of Science (SC), High Energy Physics (HEP); Nuclear Physics (NP) (SC-26) USDOE Office of Science (SC); High Energy Physics (HEP) (SC-25)
- Contributing Organization:
- STAR Collaboration
- Grant/Contract Number:
- NRF-2012004024; SC00112704; AC02-06CH11357; AC02-05CH11231
- OSTI ID:
- 1213873
- Alternate ID(s):
- OSTI ID: 1184849; OSTI ID: 1201356; OSTI ID: 1221988
- Report Number(s):
- BNL-108156-2015-JA; S0370269315002762; PII: S0370269315002762
- Journal Information:
- Physics Letters B, Journal Name: Physics Letters B Vol. 745 Journal Issue: C; ISSN 0370-2693
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- Netherlands
- Language:
- English
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