Mainz 2022 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 56: Heavy-Ion Collisions and QCD Phases XI
HK 56.4: Vortrag
Donnerstag, 31. März 2022, 15:00–15:15, HK-H1
Σ0 reconstruction in Ag+Ag collisions at √sNN = 2.55 GeV with HADES — •Marten Becker for the HADES collaboration — Justus-Liebig-University Giessen
HADES investigates the moderate temperature and high density regime of the QCD phase diagram. Strangeness can give a direct insight into the created dense matter, in particular close to the nucleon nucleon production threshold. In 2019 HADES collected Ag+Ag collisions at 2.55 GeV center of mass energy. A newly installed electromagnetic calorimeter allows for photon detection. Furthermore the RICH detector was upgraded, which strongly improves electron identification and the detection of conversion-pairs. In this contribution preliminary results on the search for the Σ0 baryon, decaying electromagnetically into Λ + γ will be presented. Detailed simulations prove the feasibility of this measurement using photon detection in the electromagnetic calorimeter or by employing photon conversion method based on the reconstruction of low momentum electrons in the RICH. Using the photon detected in the electromagnetic calorimeter an estimate of the Λ/Σ0 ratio will be extracted.