Measurement of higher-order harmonic azimuthal anisotropy in PbPb collisions at s NN =2.76 TeV
Journal
Physical Review C - Nuclear Physics
Journal Volume
89
Journal Issue
4
Date Issued
2014
Author(s)
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 s NN = 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 < p T < 8.0 GeV/c), collision centrality (0%-70%), and pseudorapidity (
< 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.
Type
journal article