Abstract
The measurement of azimuthal correlations of charged particles is presented for Pb-Pb collisions at sqrt{s_{mathrm{NN}}}=2.76 TeV and p-Pb collisions at sqrt{s_{mathrm{NN}}}=5.02 TeV with the ALICE detector at the CERN Large Hadron Collider. These correlations are measured for the second, third and fourth order flow vector in the pseudorapidity region |η| < 0.8 as a function of centrality and transverse momentum pT using two observables, to search for evidence of pT-dependent flow vector fluctuations. For Pb-Pb collisions at 2.76 TeV, the measurements indicate that pT-dependent fluctuations are only present for the second order flow vector. Similar results have been found for p-Pb collisions at 5.02 TeV. These measurements are compared to hydrodynamic model calculations with event-by-event geometry fluctuations in the initial state to constrain the initial conditions and transport properties of the matter created in Pb–Pb and p–Pb collisions.
Highlights
JHEP09(2017)032 deviate from the reaction plane and the odd flow coefficients v2n−1 are non-vanishing [8,9,10,11,12,13,14]
Three different technologies are employed in the Inner Tracking System (ITS): the two innermost layers are equipped with Silicon Pixel Detectors (SPD), the following two layers have Silicon Drift Detectors (SDD) and the two outer layers are double-sided Silicon Strip Detectors (SSD)
In Pb–Pb collisions, both v2{2}/v2[2] and r2 show deviations from unity, and the r2 results are consistent with previous measurements from the CMS collaboration
Summary
JHEP09(2017)032 deviate from the reaction plane and the odd flow coefficients v2n−1 are non-vanishing [8,9,10,11,12,13,14]. For Pb–Pb collisions at 2.76 TeV, the measurements indicate that pT-dependent fluctuations are only present for the second order flow vector.
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