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HK: Physik der Hadronen und Kerne

HK 13: Poster Session: Heavy Ions

HK 13.1: Poster

Dienstag, 12. März 2002, 10:30–12:45, Foyer Chemie

Close dilepton pair rejection strategies for HADES — •Jaroslav Bielcik — GSI, Darmstadt

The second-generation dilepton spectrometer HADES at GSI has recently started to take physics data from heavy-ion induced reactions in the 1-2 AGeV energy range. The main contribution to the combinatorial background in the measured e⁺e− continuum comes from conversion pairs induced by π0 decay photons.The identification of these pairs and their removal from the track sample decreases significantly the combinatorial background to be subtracted from the reconstructed e⁺e⁻ mass distribution in order to isolate the vector meson e⁺e⁻ signal. A full simulation of the HADES spectrometer response to conversion pairs has been performed and was used to develop efficient strategies based on a cluster analysis in MDC and RICH subdetectors to identify such pairs.Our methods will be presented and results will be discussed.