Speaker
Description
Measurements of azimuthal correlations revealed an unexpected collective behaviour in small collision systems similar to the one exhibited by the quark-gluon plasma in heavy-ion collisions. In this talk, the origin of collectivity in small collision systems, which is still not understood, is addressed by confronting different tunes of PYTHIA8, Herwig, and EPOS4 event generators using measurements of azimuthal correlations for inclusive and identified particles. In particular, anisotropic flow coefficients measured using two- and four-particle cumulants with various pseudorapidity gaps and balance functions are reported in different multiplicity classes of pp collisions at $\sqrt{s} = 13.6$ TeV and p-Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV. The results are compared with the available experimental data providing a quantitative Monte Carlo baseline for interpreting flow measurements in small collision systems.
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