Dresden 2013 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 1: Eingeladene Hauptvorträge

HK 1.2: Hauptvortrag

Montag, 4. März 2013, 10:00–10:40, HSZ-02

Variety of Strangeness Physics with HADES — •Eliane Epple — Excellence Cluster "Universe", 85748 Garching

During the last years the HADES collaboration has produced a variety of physics results in the SIS energy regime connected to strangeness. Within this talk I will highlight what we have learned about strange particles produced in light and heavy systems.

In the reaction p+p (3.5 GeV) we have studied resonances like Λ(1405), which reveals surprising properties. This resonance might serve as a doorway to a new field of investigation, including also the search for a kaonic nuclear bound state, the so-called ppK⁻. As it decays into p+Λ, it is important to understand the final state p+K⁺+Λ precisely.

To study the cold nuclear medium, we have compared p+p to p+Nb reactions at the same beam kinetic energy of 3.5 GeV. In the strangeness sector, we concentrate on the analysis of K_S⁰ and Λ’s. We want to learn how the medium affects the particle properties. As we compare our data to transport models, effects such as in-medium potentials or in-medium scattering processes can be studied.

In our recent data of Au+Au (1.25 AGeV) I will show our first successes in reconstructing kaons and Λ’s. Our future plans with HADES are measurements of pion-induced reactions on elementary and nuclear targets. Again, the focus is on the study of the interaction of strange particles with the ambient nuclear medium to quantify further the particle absorption and nuclear potentials.