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Isolation of Flow and Nonflow by Two- and Multi-Particle Cumulant Measurements of vn in sNN=200 GeV Au + Au Collisions by STAR

Li Yi - No affiliation found

2013/05/02 Full-length article DOI: 10.1016/j.nuclphysa.2013.02.034 Journal: Nuclear Physics A

Abstract:

AbstractWe apply a data-driven method to STAR Au + Au collisions at sNN=200 GeV to isolate Δη-dependent and Δη-independent correlations by using two- and four-particle Q-cumulant vn measurements. The Δη-independent part, dominated by flow, is found to be η-independent within the STAR TPC of ±1 unit of pseudo-rapidity. The Δη-dependent part may be associated to nonflow, and is responsible for the Δη drop in the measured two-particle v2 cumulant. We combine our result to four- and six-particle cumulants to gain further insights on the nature of flow fluctuations.