Anisotropic Flow of Charged Particles in Pb-Pb Collisions at root S-NN=5.02 TeV
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ALICE Collaboration... Show more Show less
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Abstract
We report the first results of elliptic (v2), triangular (v3), and
quadrangular (v4) flow of charged particles in Pb-Pb collisions at a
center-of-mass energy per nucleon pair of root s(NN) = 5.02 TeV with the
ALICE detector at the CERN Large Hadron Collider. The measurements are
performed in the central pseudorapidity region vertical bar n vertical
bar < 0.8 and for the transverse momentum range 0.2 < p(T) < 5 GeV/c.
The anisotropic flow is measured using two-particle correlations with a
pseudorrapidity gap greater than one unit and with the multiparticle
cumulant method. Compared to results from Pb-Pb collisions at root s(NN)
= 2.76 TeV, the anisotropic flow coefficients v2, v3, and v4 are found
to increase by (3.0 +/- 0.6)\%, (4.3 +/- 1.4)\%, and (10.2 +/- 3.8)\%,
respectively, in the centrality range 0\%-50\%. This increase can be
attributed mostly to an increase of the average transverse momentum
between the two energies. The measurements are found to be compatible
with hydrodynamic model calculations. This comparison provides a unique
opportunity to test the validity of the hydrodynamic picture and the
power to further discriminate between various possibilities for the
temperature dependence of shear viscosity to entropy density ratio of
the produced matter in heavy-ion collisions at the highest energies.... Show more Show less