HADES experiments investigating in-medium hadron properties

Piotr Salabura

Institute of Physics Jagiellonian University, Krakow, Poland

The HADES spectrometer installed at GSI Darmstadt is a second generation experiment designed to measure  e+e- pairs (dielectrons) in the SISBEVALAC energy regime.  The main goal of the experiment is to measure electromagnetic emissivity of a compressed baryonic matter formed in course of heavy ion collisions and ultimately learn about in-medium hadron properties.  For this purpose a dedicated programme focusing on systematic investigation of dielectron production in nucleon-nucleon, proton-nucleus and heavy ion reactions is on-going.  A comparison of the nucleon-nucleon data to the one obtained in more complex systems allows for isolation of true in-medium effects and study their properties.  Furthermore, thank to excellent particle identification capabilities of the detector, investigations have also been extended to strangeness production, which at these energies is confined to a high density zone of the collision.  In particular intriguing new results on hadrons containing two strange quarks (phi(1022) and Ksi(1321)) will be discussed.  In the talk overview of results and perspective for future investigations, in particular in the new FAIR project, will be given.

Agakishiev, C.,  et al. (HADES collaboration) Phys.Rev. C 80 (2009) 025209.

Agakishiev, C.; et al. (HADES collaboration) Phys. Rev.Lett. 103 (2009) 13230.

Agakishiev, C.; et al. (HADES collaboration) Phys.Rev. C 84 (2011) 014902.