München 2006 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 55: Hauptvortr
äge
HK 55.4: Hauptvortrag
Freitag, 24. März 2006, 12:00–12:30, A
Probing the in-medium properties of hadrons with di-electrons — •Christian Sturm — J.W. Goethe-Universität Frankfurt, Max-von-Laue-Str.1, 60438 Frankfurt am Main
The spectroscopy of electron-positron pairs represents a unique tool to investigate the properties of hadrons in dense nuclear matter produced in relativistic heavy ion collisions. At bombarding energies of 1-2 GeV/nucleon available at SIS/GSI nuclear matter is compressed up to 3 times the saturation density at moderate life times. The di-lepton spectrometer HADES at GSI is designed to study electron-positron pairs emitted in collisions of heavy ions as well as in proton and pion induced reactions on protons and nuclei. A major goal is to investigate hadron properties in the vacuum and in nuclear matter, in particular to search for in-medium mass modifications of light vector mesons. In C+C collisions at 2 GeV/nucleon incident energy almost 20000 e+e− pairs have been reconstructed in the invariant mass range up to 1 GeV/c2 . In p+p collisions at 2.2 GeV incident energy the η meson has been identified in the electromagnetic decay channel η → e+ e− γ as well as in the hadronic decay channel η → π+ π− π0 to determine the electron reconstruction efficiency. The e+e− invariant mass spectra obtained in C+C and p+p reactions will be shown and compared to transport model calculations.
This project is supported by BMBF, GSI and the EU.