Searches for transverse momentum dependent flow vector fluctuations in Pb--Pb and p--Pb collisions at the LHC

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2.76 TeV
5.02 TeV
Abstract Plain Text: 
The measurement of azimuthal correlations of charged particles is presented for Pb--Pb collisions at $\snn=$ 2.76 TeV and p--Pb collisions at $\snn=$ 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 $|\eta|<0.8$ as a function of centrality and transverse momentum $\pt$ using two observables, to search for evidence of $p_{\rm T}$-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.