Orateur
Description
Measurements of high-multiplicity pp and pA collisions at LHC energies have revealed that these small colliding systems exhibit quark-gluon plasma-like features, such as collective behaviour and strangeness enhancement. A method to narrow down the origin of this phenomenon is to relate the strangeness production to Multi-Parton Interactions (MPIs). Although the MPIs cannot be measured directly, the observable $R_{\rm T}$, quantifying the magnitude of the underlying event (UE), can be used as an experimental proxy.
Final results of the charged particle production as a function of $R_{\rm T}$ in pp, p--Pb and Pb--Pb collisions at $\sqrt{s_{\rm{NN}}}$ = 5.02 TeV will be presented in the toward, away and transverse regions relative to the hard scattering. In addition, results on the production of identified hadrons ($\pi$, K, p) and strange particles ($\rm{K}_{S}^{0}$, $\Lambda$ and $\Xi$) as a function of $R_{\rm T}$ in pp collisions at $\sqrt{s}$ = 13 TeV will be discussed to explore the particle species dependence. All these results will be compared with predictions from QCD-inspired Monte Carlo event generators such as PYTHIA and EPOS.
