Energy dependence and fluctuations of anisotropic flow in Pb-Pb collisions at root(NN)-N-s=5.02 and 2.76 TeV
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Zinovjev, G. and Zmeskal, J. and Zou, S. and ALICE Collaboration... Show more Show less
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Abstract
Measurements of anisotropic flow coefficients with two-and
multi-particle cumulants for inclusive charged particles in Pb\{Pb
collisions at root s(NN) = 5 : 02 and 2.76TeV are reported in the
pseudorapidity range vertical bar eta vertical bar < 0 : 8 and
transverse momentum 0 : 2 < p(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 upp to the sixth flow harmonic
(v6) are reported and a detailed comparison among results at the two
energies is carried out. The pT dependence of anisotropic flow
coefficients and its evolution with respect to centrality and harmonic
number n are investigated. An approximate power-law scaling of the form
v(n) (p(T)) similar to p(T)(n/3) is observed for all flow harmonics at
low p(T) (0.2 < p(T) < 3 GeV/c). At the same time, the ratios
v(n)/v(m)(n/m) are observed to be essentially independent of pT for most
centralities up to about pT = 10 GeV/c. Analysing the di ff erences
among higher-order cumulants of elliptic flow (v(2)), which have di ff
erent sensitivities to flow fluctuations, a measurement of the
standardised skewness of the event-by-event v(2) distribution P (v(2))
is reported and constraints on its higher moments are provided. The
Elliptic Power distribution is used to parametrise P (v(2)), extracting
its parameters from fi ts to cumulants. The measurements are compared to
di ff erent model predictions in order to discriminate among
initial-state models and to constrain the temperature dependence of the
shear viscosity to entropy-density ratio.... Show more Show less