Measurement of the correlation between flow harmonics of different order in lead-lead collisions at √sNN=2.76 TeV with the ATLAS detector

ATLAS, Collaboration; Beck, Hans Peter; Cervelli, Alberto; Ereditato, Antonio; Haug, Sigve; Kabana, Sonja; Meloni, Federico; Mullier, Geoffrey André Adrien; Pretzl, Klaus-Peter; Stramaglia, Maria Elena; Stucci, Stefania; Weber, Michael (2015). Measurement of the correlation between flow harmonics of different order in lead-lead collisions at √sNN=2.76 TeV with the ATLAS detector. Physical review. D - particles, fields, gravitation, and cosmology, C92(3), 034903. American Physical Society 10.1103/PhysRevC.92.034903

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Correlations between the elliptic or triangular flow coefficients vm (m =2 or 3) and other flow harmonics vn (n =2 to 5) are measured using √sNN=2.76 TeV Pb+Pb collision data collected in 2010 by the ATLAS experiment at the LHC, corresponding to an integrated lumonisity of 7 μ b¯¹. The vm -vn correlations are measured in midrapidity as a function of centrality, and, for events within the same centrality interval, as a function of event ellipticity or triangularity defined in a forward rapidity region. For events within the same centrality interval, v₃ is found to be anticorrelated with v₂ and this anticorrelation is consistent with similar anticorrelations between the corresponding eccentricities ϵ₂ and ϵ₃. On the other hand, it is observed that v₄ increases strongly with v₂, and v₅ increases strongly with both v₂ and v₃. The trend and strength of the v m -v n correlations for n =4 and 5 are found to disagree with ϵm -ϵn correlations predicted by initial-geometry models. Instead, these correlations are found to be consistent with the combined effects of a linear contribution to vn and a nonlinear term that is a function of v 2 2 or of v₂v₃, as predicted by hydrodynamic models. A simple two-component fit is used to separate these two contributions. The extracted linear and nonlinear contributions to v₄ and v₅ are found to be consistent with previously measured event-plane correlations.

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