Measurement of anisotropic flow coefficients in Pb-Pb collisions at S[sub NN] = 2.76 TeV by the CMS experiment

Abstract

We present azimuthal anisotropy in Pb-Pb collisions at SNN = 2.76 TeV measured by the CMS experiment. Severalmethodswere employed to extract the strength of the signal: the eventplane, cumulant and Lee-Yang zeros methods. These methods typically have different sensitivity to non-flow correlations and flow fluctuations. The second Fourier coefficient ν2 of the charged hadron azimuthal distributions was extracted as a function of transverse momentum, pseudorapidity and centrality in a broad kinematic range: 0.3<pT<12.0 GeV/c and |η|<2.4). The pT and centrality dependence of the higher-order flow harmonics ν3, ν4, ν5 are presented and discussed.