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 2.5: Talk

Monday, March 28, 2022, 15:15–15:30, HK-H1

Neutral pion identification from merged clusters with ma- chine learning methods in ALICE — •Jan Honermann for the ALICE collaboration — Institut für Kernphysik, Münster, Deutsch- land

The ALICE detector at CERN LHC is designed for the study of hot nuclear matter. Historically, one of the first probes to confirm the presence of such hot nuclear matter in heavy-ion collisions were neutral pions. The production of neutral pions was found to be significantly suppressed in heavy-ion collisions compared to pp or deuteron-gold collisions. Most traditional identification methods for neutral pions in these studies rely on an invariant mass analysis of the decay products. When the energy of the neutral pion becomes too large, these methods stop working though, since hits of decay products can not be resolved individually any longer. In this talk, initial efforts to distinguish between these merged clusters from neutral pions and coincidental hits from background processes with the help of neural networks in 13TeV pp-collisions will be presented.

Supported in the contex of the BMBF ErUM Framework.