Friday 14 February, 11:00h, at Nikhef in H331
Speaker: Dr. Manuel Lorenz (Goethe-Universität – Frankfurt am Main, ExtreMe Matter Institute EMMI – Darmstadt)
Title: "Recent results on dilepton and strangeness production with HADES"
Abstract:
Data on particle production in heavy ion collisions in the energy regime of 1-2 A GeV have been collected over almost three decades now. As most of the newly created hadrons are produced below or slightly above their free NN-thresholds, data are usually interpreted with the help of phenomenological models, rather than comparing to elementary reference measurements.
Driven by advance in detector technology, more and more rare and penetrating probes have become accessible, and still keep challenging our knowledge about the properties of the created system and its dynamical evolution. The HADES experiment, installed at the Helmholtzzentrum für Schwerionenforschung (GSI) accelerator facility in Darmstadt, investigates dielectron emission and strangeness production in various collision systems (p+p, p+n, p+A and A+A). The observed low-mass dielectron and .. enhancement in intermediate heavy-ion collisions indicates the onset of medium effects, on the one hand, and underlines the importance of a solid knowledge of contributions of baryon resonances on the other hand. The latter turned out to be of eminent importance for the interpretation of the spectral shape of the meson already in elementary data and moreover for the extraction of additional medium eff ects in p+A and A+A collisions.
In this talk, I summarize the findings of HADES so far and give an outlook to the recently collected data from Au+Au collisions at 1.23 A GeV, which represent the most advanced data sample of heavy ion collisions in terms of precision and statistics (7*109 collected events) in this energy regime.
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