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 2.1: Group Report

Monday, March 28, 2022, 14:00–14:30, HK-H1

Measurement of neutral mesons in pp, p–Pb and Pb–Pb collisions with ALICE — •Marvin Hemmer for the ALICE collaboration — Institut für Kernphysik, Goethe-Universität Frankfurt

Multiplicity-dependent measurements of the neutral meson production in pp, p–Pb, and Pb–Pb collisions can be utilised to study different aspects of the hadronisation such as multi-parton interactions and collective effects. Furthermore, a better understanding of the neutral meson production can help to better constrain theoretical models of the production processes and can serve as crucial input for cocktail calculations needed for direct photon and dielectron analyses.

In ALICE, neutral mesons can be measured using different reconstruction methods. For the π⁰ and η mesons these methods are based on the detection of decay photons with calorimeters or by reconstructing e⁺e⁻ pairs from conversions in the detector material with the central tracking system. The ω meson is reconstructed using the measured π⁰ mesons together with an additional photon (ω→π⁰γ) or opposite charged pion tracks (ω→π⁺π⁻π⁰).

In this talk, an overview of the π⁰, η and ω measurements with ALICE is presented. In particular, we will focus on a multiplicity dependent measurement of π⁰ and η in pp collisions at √s = 13 TeV.

Supported by BMBF and the Helmholtz Association.