• Open Access

Measurement of higher-order harmonic azimuthal anisotropy in PbPb collisions at sNN=2.76 TeV

S. Chatrchyan et al. (CMS Collaboration )
Phys. Rev. C 89, 044906 – Published 11 April 2014

Abstract

Measurements are presented by the CMS Collaboration at the Large Hadron Collider (LHC) of the higher-order harmonic coefficients that describe the azimuthal anisotropy of charged particles emitted in sNN=2.76 TeV PbPb collisions. Expressed in terms of the Fourier components of the azimuthal distribution, the n=3–6 harmonic coefficients are presented for charged particles as a function of their transverse momentum (0.3<pT<8.0GeV/c), collision centrality (0%–70%), and pseudorapidity (|η|<2.0). The data are analyzed using the event plane, multiparticle cumulant, and Lee-Yang zeros methods, which provide different sensitivities to initial-state fluctuations. Taken together with earlier LHC measurements of elliptic flow (n=2), the results on higher-order harmonic coefficients develop a more complete picture of the collective motion in high-energy heavy-ion collisions and shed light on the properties of the produced medium.

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  • Received 31 October 2013

DOI:https://doi.org/10.1103/PhysRevC.89.044906

Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

©2014 CERN, for the CMS Collaboration

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Vol. 89, Iss. 4 — April 2014

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