Speaker
Ante Bilandzic
(Technische Universitaet Muenchen (DE))
Description
Multiparticle azimuthal correlations are utilized in anisotropic flow stud- ies as observables sensitive to the properties of Quark-Gluon Plasma (QGP), an extreme state of matter which can be produced in ultra-relativistic heavy- ion collisions. We will present the first results [1] for elliptic (v2), triangular (v3) and quadrangular flow (v4) of charged particles in Pb–Pb collisions at √sNN = 5.02 TeV recorded by ALICE during the LHC Run 2 operations. The comparison of experimental measurements to various theoretical calculations will be discussed.
In addition, results are reported for so-called symmetric cumulants. De- veloped by ALICE, these new multiparticle observables depend only on the correlations between event-by-event amplitude fluctuations of anisotropic flow harmonics vn, and are therefore independent on the corresponding sym- metry planes. The centrality dependence of correlation between fluctuations of the elliptic, v2, and quadrangular, v4, flow harmonics, as well as of anti- correlation between v2 and triangular, v3, flow harmonics will be discussed in two different regimes for the initial stages: geometry-dominated (in mid- central heavy-ion collisions) and fluctuation-dominated (in the most central heavy-ion collisions).
The measurement of individual flow harmonics together with symmetric cumulants further constrain details of initial stages and the transport prop- erties of the produced QGP. These results offer a unique opportunity to test the validity of the hydrodynamic picture and to discriminate between vari- ous possibilities for the temperature dependence of shear viscosity to entropy density ratio of the produced QGP.
| Collaboration | ALICE |
|---|
