Gießen 2024 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 23: Heavy-Ion Collisions and QCD Phases V

HK 23.4: Talk

Tuesday, March 12, 2024, 16:45–17:00, HBR 62: EG 18

Accessing the p−Σ⁺ interaction via femtoscopy with ALICE
— •Benedict Heybeck — Institut für Kernphysik, Johann Wolfgang Goethe-Universität Frankfurt, Frankfurt, Germany

The Σ-nucleon interaction is crucial for the description of neutron stars and potential Σ-hypernuclei. Since Σ-baryons have similar masses and quark content as Λ-baryons, their interaction might be similar. However, models do not even agree if the Σ-nucleon interaction is attractive or repulsive and scattering data is scarce. Thus, two-particle intensity interferometry (femtoscopy) of Σ-baryons and nucleons can provide valuable information.
Σ⁺-baryons decay into a proton and a neutral pion via the weak interaction with a branching ratio of 51.57%. The neutral pion decays electromagnetically almost exclusively into two photons which are challenging to measure with the ALICE apparatus.
In this talk, a new reconstruction method will be shown which makes use of machine learning techniques and significantly improves the reconstruction efficiency of the Σ-baryons.
The obtained correlation function will be discussed and related to latest theoretical predictions and scattering data.

Keywords: Femtoscopy; Strangeness; Machine learning