Speaker
Description
The collective behaviour, associated with the quark-gluon plasma formation in ultrarelativistic heavy-ion collisions, has been observed also in high-multiplicity collisions of small systems such as pp and p--Pb at the LHC. Using the data recorded with the ALICE experiment, thanks to its unique particle identification capability and the forward multiplicity detectors, it is possible to study ultra-long-range correlations of identified particles. Such analyses allow to extract the flow coefficients of many different particle species free of non-flow contamination employing the template fit method. While the mass ordering has been observed before, a baryon-meson splitting in the intermediate $p_{\rm T}$ region, with a statistical significance larger than 3$\sigma$, is observed for the first time. Such a behaviour cannot be explained by the jet fragmentation alone, thus advocating the contribution from the quark coalescence that shows the evidence of partonic collectivity.
