Bonn 2010 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 36: Postersitzung

HK 36.1: Poster

Mittwoch, 17. März 2010, 14:00–16:00, HG Aula

Electromagnetic probes of matter under extreme conditions — •Elena Belolaptikova1, Tetyana Galatyuk1, Claudia Höhne2, and Joachim Stroth11Goethe-Universität, Frankfurt, Germany — 2GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany

The study of the electromagnetic structure of hadrons plays an important role in understanding the nature of matter. In particular the emission of lepton pairs out of the hot and dense collision zone in heavy ion reactions is a promising probe to investigate in-medium properties of hadrons and in general the properties of matter under extreme conditions. A strong excess of lepton pairs observed by recent high energy heavy-ion dilepton experiments hint to a strong influence of baryons, however no data exist at highly compressed baryonic matter, achievable in heavy-ion collisions from 8-45 GeV/u beam energy. These conditions would allow to study the expected restoration of chiral symmetry by measuring in-medium modifications of hadronic properties, an experimental program which is foreseen by the future CBM experiment at FAIR. The experimental strategy how to assess best the low-mass vector mesons by means of their electromagnetic decay at different collision energies and system sizes is under careful investigation. The main goal is to study the feasibility to effectively reduce the combinatorial background with the currently foreseen experimental setup, which does not provide electron identification in front of the magnetic field. The systematic behaviour of the signal-to-background ratio as function of collision energy will be presented in this report.

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