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Type: Journal article
Title: Measurement of flow harmonics with multi-particle cumulants in Pb+Pb collisions at √sNN=2.76 TeV with the ATLAS detector
Other Titles: Measurement of flow harmonics with multi-particle cumulants in Pb+Pb collisions at root sNN=2.76 TeV with the ATLAS detector
Author: ATLAS Collaboration
Aad, G.
Citation: European Physical Journal C: Particles and Fields, 2014; 74(11):3157-1-3157-28
Publisher: Springer
Issue Date: 2014
ISSN: 1434-6044
Statement of
G. Aad … P. Jackson … L. Lee … A. Petridis … N. Soni ... M. White ... et al. (The ATLAS Collaboration)
Abstract: ATLAS measurements of the azimuthal anisotropy in lead-lead collisions at sNN---root=2.76 TeV are shown using a dataset of approximately 7 mu b -1 collected at the LHC in 2010. The measurements are performed for charged particles with transverse momenta 0.5<pT<20 GeV and in the pseudorapidity range |eta|<2.5. The anisotropy is characterized by the Fourier coefficients, vn, of the charged-particle azimuthal angle distribution for n=2-4. The Fourier coefficients are evaluated using multi-particle cumulants calculated with the generating function method. Results on the transverse momentum, pseudorapidity and centrality dependence of the vn coefficients are presented. The elliptic flow, v2, is obtained from the two-, four-, six- and eight-particle cumulants while higher-order coefficients, v3 and v4, are determined with two- and four-particle cumulants. Flow harmonics vn measured with four-particle cumulants are significantly reduced compared to the measurement involving two-particle cumulants. A comparison to vn measurements obtained using different analysis methods and previously reported by the LHC experiments is also shown. Results of measurements of flow fluctuations evaluated with multi-particle cumulants are shown as a function of transverse momentum and the collision centrality. Models of the initial spatial geometry and its fluctuations fail to describe the flow fluctuations measurements.
Keywords: ATLAS Collaboration
Rights: © CERN for the benefit of the ATLAS collaboration 2014. This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited. Funded by SCOAP3 / License Version CC BY 4.0
DOI: 10.1140/epjc/s10052-014-3157-z
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