Mainz 2022 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 35: Heavy-Ion Collisions and QCD Phases VII
HK 35.5: Talk
Wednesday, March 30, 2022, 15:15–15:30, HK-H1
Measurement of the Λ separation energy in hypertriton with ALICE using machine learning techniques — •Regina Michel for the ALICE collaboration — GSI Helmholtzzentrum für Schwer-ionenforschung — Technische Universität Darmstadt
Hypertritron 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 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 flying through the detector. A data sample from Pb-Pb collisions at √sNN = 5.02 TeV recorded with ALICE at the LHC is analyzed using machine learning techniques.