Σ0 reconstruction in Ag+Ag collisions at 1.58 AGeV with the HADES experiment.

In this contribution we will discuss the production of Σ0 baryons in Ag+Ag collisions at 1.58AGeV beam energy measured by HADES. The experimental upgrade with an electromagnetic calorimeter enables a clear reconstruction of the Σ0. The first sub threshold Σ0 production in A+A collisions is compared to available p+p data as well as transport calculations and statistical hadronisation models. [ABSTRACT FROM AUTHOR]