SMuK 2023 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 27: Heavy-Ion Collisions and QCD Phases V

HK 27.5: Vortrag

Mittwoch, 22. März 2023, 15:15–15:30, SCH/A216

First measurements of Σ⁺ and Σ⁻ with ALICE
— •Benedict Heybeck for the ALICE Germany collaboration — Institut für Kernphysik, Johann Wolfgang Goethe-Universität Frankfurt, Frankfurt, Germany

The first measurements of Σ⁺- and Σ⁻-baryons with ALICE in pp collisions at √s = 13 TeV will be presented.
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 particular, since these photons have low momenta. However, Σ baryons are an important probe to study the strangeness production in pp collisions. Furthermore, the reconstructed Σ baryons can be used for correlation measurements with protons to improve the understanding of the interaction between nucleons and hyperons.