Bonn 2020 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 24: Heavy-Ion Collisions and QCD Phases V

HK 24.4: Vortrag

Mittwoch, 1. April 2020, 15:00–15:15, J-HS F

First measurements of multi-harmonic correlations in ALICE — •Cindy Victorine Simone Mordasini for the ALICE collaboration — Technische Universität München (DE)

Genuine multiparticle azimuthal correlations have shown their usefulness to study and constrain the properties of the Quark-Gluon Plasma (QGP). Recently introduced, the measurements of the correlated fluctuations between two different flow amplitudes using Symmetric Cumulants have exhibited a better sensitivity to the transport properties of the QGP than the studies of single flow amplitudes.

The question of the genuine correlations between more than two flow amplitudes has then arisen. Their measurements can bring new and independent constraints on the system produced in heavy-ion collisions. In that respect, a generalisation of the Symmetric Cumulants has recently been proposed. This new set of observables is sensitive only to the genuine correlations between three and more flow amplitudes and has been named higher order Symmetric Cumulants.

In this talk, we present the first experimental results of these new higher order multi-harmonic correlations using data collected by ALICE in Pb–Pb collisions at √sNN = 2.76 TeV. We will address their potential to provide new insights on the origin of the correlations between the flow amplitudes. We will show comparisons with state-of-the-art hydrodynamic models as well.

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