Searches for transverse momentum dependent ow vector uctuations in Pb-Pb and p-Pb collisions at the LHC

Abstract

The measurement of azimuthal correlations of charged particles is presented for Pb{Pb collisions at p sNN = 2.76TeV and p{Pb collisions at sNN = 5.02TeV with the ALICE detector at the CERN Large Hadron Collider. These correlations are measured for the second, third and fourth order ow vector in the pseudorapidity region < 0:8 as a function of centrality and transverse momentum pT using two observables, to search for evidence of pT-dependent ow vector uctuations. For Pb{Pb collisions at 2.76TeV, the measurements indicate that pT-dependent uctuations are only present for the second order ow vector. Similar results have been found for p{Pb collisions at 5.02TeV. These measurements are compared to hydrodynamic model calculations with event-by-event geometry uctuations in the initial state to constrain the initial conditions and transport properties of the matter created in Pb{Pb and p{Pb collisions.