Orateur
Description
This talk presents measurements by the ALICE Collaboration of neutral $\pi^0$, $\eta$, and $\omega$ meson production in proton-proton collisions at $\sqrt{s}$ = 13 TeV. Such measurements can constrain the proton parton distribution functions (PDF) and fragmentation functions (FF), and provide input for background corrections of direct photon and dileption analyses. Measurements of $\pi^0$ and $\eta$ meson distributions within and outside of reconstructed jets are reported, which constrain meson FFs. Distributions of inclusive meson production in multiplicity-selected pp collisions are also reported. Phenomena that are characteristic of quark-gluon plasma (QGP) formation, notably strangeness enhancement and the presence of collective flow, have been observed previously in high-multiplicity pp collisions. These new measurements provide additional insight into particle production and hadron chemistry, and the formation of the QGP in small systems.
