Tübingen 2003 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 12: Poster-Sitzung: Instrumentation und Anwendungen
HK 12.13: Poster
Dienstag, 18. März 2003, 13:30–15:30, Foyer
Particle identification in the HADES detector† — •T. Christ1, J. Bielcik2, T. Eberl1, L. Fabbietti1, M. Golubeva3, R. Holzmann2, M. Jaskula4, C. Müntz2, J. Otwinowski4, P. Salabura4, M. Sánchez5, P. Tlusty6, K. Tyminska2, D. Zovinec7, and P. Zumbruch2 — 1TUM, Department E12, München, Germany — 2GSI, Darmstadt, Germany — 3INR, Troitsk, Russia — 4Jagiellonian Univ., Cracow, Poland — 5Univ. of Santiago, Santiago de Compostela, Spain — 6Czech Academy of Sciences, Rez, Czech Republic — 7Slovak Academy of Sciences, Bratislava, Slovak Republic
The HADES spectrometer installed at GSI has been designed to study primarily dilepton production in medium-energy heavy-ion, as well as proton– and pion-induced reactions. Efficient particle identification (PID) and the suppression of closed lepton pairs is of prime importance for the extraction of the rare physics signals of interest, i.e. lepton pairs from vector meson decays. To this aim Hades delivers — next to direct lepton PID in a RICH, as well as in a Pre-shower detector — momentum, velocity and energy-loss of all charged particles detected in TOF counters and drift chambers. We demonstrate that from a combination of these observables PID can be achieved for leptons over the full momentum range and for hadrons up to 1.2 GeV/c. Likewise, rejection of close pairs is realized through an analysis of hit patterns. The implementation and performance of various PID algorithms will be discussed, and charged particle spectra from 1 – 2 AGeV C+C collisions will be presented. † supported by GSI, BMBF, INTAS and EU