Bonn 2020 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 14: Hadron Structure and Spectroscopy IV

HK 14.1: Gruppenbericht

Dienstag, 31. März 2020, 17:00–17:30, J-HS M

Σ0 production in p(3.5 GeV)p collisions at HADES — •Waleed Esmail and James Ritman for the HADES collaboration — Jülich Forschungszentrum, GmbH, IKP1, 52428 Jülich

Studying hyperon production at beam energies of a few GeV is important for many open questions in the field of hadron physics. While there are several experimental results for Λ hyperons in p+p reactions, measurements of Σ0 production are scarce. This study is a first step to gain access to the hyperon electromagnetic transition form factors with the upgraded HADES detector system. As a first step, existing HADES data taken in 2007 with a proton beam of kinetic energy 3.5 GeV incident on liquid hydrogen target were used to study the production of Σ0 baryons via the exclusive reaction ppp K+ Σ0 . Σ0s were identified via the decay Σ0 → Λ γ with subsequent decays Λ → p π. Since HADES was not equipped with an electromagnetic calorimeter at that time, photons are identified as a missing mass particle, while other charged particles are identified by their energy loss and time of flight. This talk will present a brief overview of the first results about the electromagnetic decay of the Σ0.

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