Speaker
Description
Long-range azimuthal angle correlations of the produced particles have been observed in high multiplicity proton--lead (p--Pb) and proton--proton (pp) collisions, indicating the presence of collective effects in small systems. The origin of these effects is the subject of intense debate.
In this talk, we present the measurements of $v_{\rm n}$ of charged particle pairs and identified hadrons as a function of multiplicity and $p_{\rm T}$ in p--Pb and pp collisions at $\sqrt{s_{\rm NN}}=$ 5.02 TeV and $\sqrt{s}=$ 13 TeV, respectively. The non-flow contributions are significantly suppressed by the use of forward detectors, allowing a large pseudorapidity separation of the correlated particles up to $|\Delta \eta| \sim 8$. In addition, the template fit method is applied to further suppress the non-flow contamination in the measurements of $v_{\rm n}$. These results show the evolution of the anisotropic flow with the event multiplicity in small collision systems. It is observed that the splitting between $v_{\rm n}$ of baryons and mesons gradually decreases as the event centrality increases. Comparison with hydrodynamic model calculations indicates that the relative contributions from the quark-coalescence mechanism decrease towards lower multiplicity p--Pb collisions.
| What kind of work does this abstract pertain to? | Experimental |
|---|---|
| Which experiment is this abstract related to? | ALICE |
