Mainz 2022 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 2: Heavy-Ion Collisions and QCD Phases I

HK 2.4: Talk

Monday, March 28, 2022, 15:00–15:15, HK-H1

Measurement of ω mesons in pp and p–Pb collisions at √s_NN=5.02 TeV with ALICE — •Nicolas Strangmann for the ALICE collaboration — Institut für Kernphysik, Goethe-Universität Frankfurt

The ALICE experiment at the LHC investigates the properties of hot and dense nuclear matter in heavy-ion collisions. By comparing the particle production in pp and p–Pb collisions, possible initial state effects can be isolated, which arise from the partons being bound within nuclei. Measurements of the ω meson spectra in pp and p–Pb collisions not only allow for a determination of the nuclear modification factor R_pA, but also provide vital input for direct photon cocktail simulations.

In the analysis presented in this talk, ω mesons are reconstructed via their primary decay channel into three pions (π⁺π⁻π⁰). While the two charged pions can be identified with the tracking detectors (TPC, ITS), the π⁰ has to be reconstructed from its two decay photons, that are detected in the electromagnetic calorimeter (EMCal).

In this talk, the measurement of the ω meson production in pp and p–Pb collisions at √s_NN=5.02 TeV will be presented. This includes the signal extraction and various corrections of the ω meson yields as well as the derivation of the R_pA.

Supported by BMBF and the Helmholtz Association.