Abstract
Abstract The elliptic flow anisotropies of charged particles and neutral pions ( π 0 s ) have been measured by the CMS collaboration for PbPb collisions at a nucleon-nucleon center-of-mass energy of 2.76 TeV. The second Fourier components of the anisotropic azimuthal distribution are obtained using an event-plane technique for π 0 s and four different analysis techniques for charged particles: event plane, two- and four-particle cumulants, and Lee-Yang Zeros. These techniques have different sensitivities to non-flow and flow fluctuation effects and their comparison helps disentangle hydrodynamic flow, initial state fluctuations and non-flow correlations. A comparison of the CMS measurements of v 2 ( p T ) from π 0 mesons and inclusive charged particles indicates a particle-species dependence in the azimuthal anisotropy at the LHC.
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