Measurements of the correlated fluctuations of the amplitudes of two different flow harmonics have been shown to be more sensitive to the properties of the Quark-Gluon Plasma created in ultrarelativistic heavy-ion collisions than the flow harmonics taken individually. In particular, their computation have given constraints to the details of the temperature dependence of shear viscosity to entropy density ratio, to which the measurements of individual flow harmonics are nearly insensitive. These observations have been made using a set of recently introduced observables called Symmetric Cumulants.
In this poster, the theoretical framework for the generalisation of Symmetric Cumulants to three and more different harmonics is presented. This new set of observables can provide information previously inaccessible and thus, independent constraints on the system produced in the nuclear collisions. Predictions of their centrality dependence at LHC energies for the coordinate space and for the momentum space obtained with the iEBE-VISHNU model are shown as well.
Based on C. Mordasini, A. Bilandzic, D. Karakoç and S. F. Taghavi, "Higher
order Symmetric Cumulants", arXiv:1901.06968 [nucl-ex].