Measurements of anisotropic flow and flow fluctuations in Xe–Xe and Pb–Pb collisions with ALICE
Abstract
Anisotropic flow is a key observable to characterise the system created
in heavy-ion collisions, as it is sensitive to the system's initial
state, transport properties, the equation of state and freeze-out
conditions. In these proceedings we present the anisotropic flow
coefficients of inclusive charged particles in Pb-Pb collisions at root
s(NN) = 2.76 and 5.02 TeV, and in Xe-Xe collisions at root s(NN) = 5.44
TeV. The results are reported for a wide range of particle transverse
momentum within the pseudo-rapidity range vertical bar eta vertical bar
< 0.8 at different collision centralities. The energy and system
dependence are found to place strong constraints on the temperature
dependence of eta/s and the modeling of the initial state, respectively.
We also present detailed studies of flow fluctuations in heavy-ion
collisions, in order to precisely characterise the underlying flow
probability density function. We find evidence of non-Bessel-Gaussian
fluctuations and discuss the origin of this observation.
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