Speaker
Description
In the scope of the FAIR Phase-0 physics program, the HADES collaboration recorded 13.7 billion Ag(1.58A GeV)+Ag events in March 2019. With an available energy of 2.55 GeV in binary nucleon nucleon collisions, the lightest hadrons containing strangeness are produced at their free nucleon nucleon threshold energy. Therefore, they are ideal probes to investigate medium effects due to their steep excitation function.
In this contribution we present preliminary results on the production of Λ hyperons and K0S mesons which are identified based on their weak decay topologies with the help of an artificial neural network (ANN). Both particles are analyzed multi-differentially as a function of transverse momentum, rapidity and centrality. Furthermore, we present the reconstruction of the 3ΛH which is the lightest known hypernucleus via its weak 3He + π– decay channel. This constitutes the first successful measurement of hypernuclei at mid-rapidity in heavy-ion collisions at such low beam energies. We contribute to resolving the 3ΛH lifetime puzzle by performing a 3ΛH lifetime measurement. Finally, we explore our capabilities of measuring multi-strange hyperons which are produced far below their free nucleon nucleon threshold energy. All presented results are discussed with respect to our findings in Au+Au collisions at √sNN = 2.42 GeV and the available world data.
