SMuK 2023 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 54: AI Topical Day – Heavy-Ion Collisions and QCD Phases XI (joint session HK/AKPIK)
HK 54.2: Vortrag
Donnerstag, 23. März 2023, 14:15–14:30, HSZ/0105
Measurement of the Λ separation energy in hypertriton with ALICE using machine learning techniques — •Regina Michel for the ALICE Germany collaboration — GSI Helmholtzzentrum für Schwerionenforschung — Technische Universität Darmstadt
Hypertriton Λ3H is the lightest hypernucleus, consisting of a Λ hyperon, a proton and a neutron. It is structured as a halo nucleus, where the Λ hyperon is very loosely bound to a "deuteron core". Measurements of the Λ separation energy can be used as a test for QCD, for some models of neutron stars and to constrain the possible difference of the lifetimes of Λ3H and Λ. The Λ separation energy can be measured via the invariant mass of the hypertriton decay products. The two-body-decay Λ3H → 3He + π is considered. Monte Carlo simulations are conducted to simulate the hypertriton interactions and decays while propagating through the detector. A data sample from Pb-Pb collisions at a center-of-mass energy of √sNN = 5.02 TeV recorded with ALICE at the LHC is analyzed using machine learning techniques.