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Measurements of anisotropic flow coefficients with two- and multi-particlecumulants for inclusive charged particles in Pb-Pb collisions at$\sqrt{{\textit s}_\text{NN}} = 5.02$ and 2.76 TeV are reported in thepseudorapidity range $|\eta| < 0.8$ and transverse momentum $0.2 < p_\text{T} <50$ GeV/$c$. The full data sample collected by the ALICE detector in 2015(2010), corresponding to an integrated luminosity of 12.7 (2.0) $\mu$b$^{-1}$in the centrality range 0-80%, is analysed. Flow coefficients up to the sixthflow harmonic ($v_6$) are reported and a detailed comparison among results atthe two energies is carried out. The $p_\text{T}$ dependence of anisotropicflow coefficients and its evolution with respect to centrality and harmonicnumber $n$ are investigated. An approximate power-law scaling of the form$v_n(p_\text{T}) \sim p_\text{T}^{n/3}$ is observed for all flow harmonics atlow $p_\text{T}$ ($0.2 < p_\text{T} < 3$ GeV/$c$). At the same time, the ratios$v_n/v_m^{n/m}$ are observed to be essentially independent of $p_\text{T}$ formost centralities up to about $p_\text{T} = 10$ GeV/$c$. Analysing thedifferences among higher-order cumulants of elliptic flow ($v_2$), which havedifferent sensitivities to flow fluctuations, a measurement of the standardisedskewness of the event-by-event $v_2$ distribution $P(v_2)$ is reported andconstraints on its higher moments are provided. The Elliptic Power distributionis used to parametrise $P(v_2)$, extracting its parameters from fits tocumulants. The measurements are compared to different model predictions inorder to discriminate among initial-state models and to constrain thetemperature dependence of the shear viscosity to entropy-density ratio.

journal of high energy physics

Energy dependence and fluctuations of anisotropic flow in Pb-Pb  collisions at $\mathbf{\sqrt{{\textit s}_\text{NN}}} = \mathbf{5.02}$ and  $\mathbf{2.76}$ TeV