V. Zhukova

Charged hadron azimuthal anisotropy (v2) in \sqrt{s}_{NN} = 2.76 TeV Pb?Pb collisions from CMS

During the past decade, azimuthal correlation measurements have played a pivotal role in our understanding of the properties of high density QCD matter through their sensitivity to the early stage evolution of relativistic heavy-ion collisions. The CMS experiment has measured the anisotropy parameter, v2, using four different methods: event-plane, two- and four-particle cumulants, and Lee–Yang zeros. Consistent results are found for the different methods after considering their respective sensitivities to non-flow correlations and event-by-event fluctuations in the initial conditions. The anisotropy is studied as a function of transverse momentum, pseudorapidity and centrality in a broad kinematic range: 0.3 < pT < 12 GeV/c, |η| < 2.4, and in 12 centrality classes in the range 0–80%.