Speaker
Description
High-multiplicity proton-proton collisions at LHC show the onset of phenomena typical of heavy-ion collisions, such as collective effects, suppression of short-lived resonances, and strangeness enhancement. These effects, whose origin is still under debate, suggest a complex particle production mechanism whose relative contributions evolve smoothly going from low to high multiplicity collisions. Light-flavor hadrons are the most abundant particles produced in pp collisions and multi-differential measurements of their production yields play a key role in the study of the hadronization mechanism.
In this contribution, recent measurements of light-flavor hadron production as a function of the charged-particle multiplicity and the (unweighted) transverse spherocity in pp collisions are presented and discussed in the context of phenomenological models implemented in general-purpose Monte Carlo generators. These results are complemented by detailed measurements of the neutral pion, eta, and omega mesons in several multiplicity classes in pp collisions at $\sqrt{s}$ = 13 TeV up to an unprecedented high $p_{\rm T}$. These measurements allow a test of perturbative QCD calculations and represent an important baseline for heavy-ion studies. Finally, preliminary results that show the ALICE performance in measuring particle production using the newest 900 GeV pp data sample collected in October 2021 will also be presented.
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