Research output: Contribution to journal › Article

ATLAS Collaboration

Original language | English |
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Article number | 034903 |

Journal | Physical Review C - Nuclear Physics |

Volume | 92 |

Issue number | 3 |

DOIs | |

Published | 1 Jan 2015 |

Additional links |

Correlations between the elliptic or triangular flow coefficients v_{m} (m = 2 or 3) and other flow harmonics v_{n} (n = 2 to 5) are measured using √s_{NN} = 2.76 TeV Pb + Pb collision data collected in 2010 by the ATLAS experiment at the LHC, corresponding to an integrated luminosity of 7 μb−^{1}. The v_{m}-v_{n} 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, v_{3} is found to be anticorrelated with v_{2} and this anticorrelation is consistent with similar anticorrelations between the corresponding eccentricities, ∊_{2} and ∊_{3}. However, it is observed that v_{4} increases strongly with v_{2}, and v_{5} increases strongly with both v_{2} and v_{3}. The trend and strength of the v_{m}-v_{n} correlations for n = 4 and 5 are found to disagree with ∊_{m}-∊_{n} correlations predicted by initial-geometry models. Instead, these correlations are found to be consistent with the combined effects of a linear contribution to v_{n} and a nonlinear term that is a function of v_{2}^{2} or of v_{2}v_{3}, as predicted by hydrodynamic models. A simple two-component fit is used to separate these two contributions. The extracted linear and nonlinear contributions to v_{4} and v_{5} are found to be consistent with previously measured event-plane correlations.

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