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HK: Fachverband Physik der Hadronen und Kerne
HK 56: Heavy-Ion Collisions and QCD Phases XIV
HK 56.6: Talk
Wednesday, March 13, 2024, 18:45–19:00, HBR 62: EG 05
Measurement of neutral meson production in small collision systems with ALICE — •Joshua König for the ALICE Germany collaboration — Institut für Kernphysik, Goethe-Universität Frankfurt
The precise measurement of the neutral meson production in pp collisions can be used to constrain fragmentation functions and parton density functions needed by pQCD calculations. The dependence of the measured neutral meson yield on the event charged-particle multiplicity can give further insight into possible final-state effects in high-multiplicity pp collisions, where other measurements show surprising similarities with results in heavy-ion collisions. Additionally, the measurement of neutral mesons serves as a baseline for direct photon analyses.
The measured neutral meson spectra cover a wide range in pT due to three independent photon reconstruction techniques available in ALICE, including two calorimeters as well as measured e+e− pairs from photon conversions in the detector material.
In this talk, the production cross sections of π0, η and ω mesons as a function of pT in pp and p–Pb collisions measured with ALICE will be presented. For pp collisions at √s = 13 TeV, the dependence of the π0 and η meson production on the charged-particle multiplicity is shown. Additionally, the production of these mesons inside reconstructed jets are used to provide a direct estimate of the fragmentation function.
Supported by BMBF and the Helmholtz Association
Keywords: ALICE; neutral mesons; pp collisions; fragmentation function; multiplicity