Speaker
Description
Interactions of proton-proton and proton-lead were not expected to form a deconfined hot and dense matter, called the Quark-Gluon Plasma (QGP). However, these small collision systems with high multiplicities revealed signs of collectivity, which are understood as a signature of the QGP emergence in heavy-ion collisions. An excellent tool to probe the presence of collectivity is the anisotropic flow measured with two- and multi-particle cumulants.
In this talk, we will present the first measurement of flow coefficients and their magnitude correlations using Symmetric Cumulants for charged particles in pp collisions at $\sqrt{s} = 13$ TeV, p-Pb at $\sqrt{s_{\rm{NN}}} = 5.02$ TeV, Xe-Xe at $\sqrt{s_{\rm{NN}}} = 5.44$ TeV and Pb-Pb collisions at $\sqrt{s_{\rm{NN}}} = 5.02$ TeV, collected at the LHC Run2 program. In addition, the flow coefficients of identified particles in p-Pb collisions will be presented. Such broad spectrum of colliding systems with different energies and wide range of multiplicity allows for detailed investigation of their collision dynamics. Non-flow effects, which are azimuthal correlations not originating from a common symmetry plane, are suppressed with the pseudorapidity separation and the subtraction method. Both methods are particularly important for studies of collectivity in small systems. The results are compared to various theoretical models, providing an important insight into initial conditions and into the nature of collective phenomena in different collision systems.
