Gießen 2007 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 13: Physik mit schweren Ionen
HK 13.1: Vortrag
Dienstag, 13. März 2007, 14:15–14:30, F
Observation of Σ(1385) in proton induced reactions at FOPI — •Laura Fabbietti1, Paul Bühler2, Michael Cargnelli2, Paul Kienle2, 1, Reiner Krücken2, Philippe Schmid2, Ken Suzuki2, Hannes Zmeskal2, and Toshimutzo Yamazaki3 for the FOPI collaboration — 1Technische Universität München — 2Stefan Meyer Institut, Wien — 3Tokio University
Strangeness production in proton induced reactions is only sparsely known in the threshold energy range, especially for higher lying hyperon resonances. The reaction p+C was investigated at a bombarding energy of 3.5 GeV with the FOPI detector at the SIS18 accelerator of GSI. Employing a correlation analysis of Λ−π-pairs, we show the experimental results obtained for the reconstruction of the Σ*(1385)+− resonance. Our results provide a lower limit of the absolute cross section and give a first indication of the phase space distribution of the produced resonance. The Σ*(1385)/Λ ratio will be shown as well. The reconstruction and quantitative control of the background in the Λ−π-decay channel, is considered a reference point for the planned investigations of the Λ−p system that will address the question of the existence of di-baryonic strange resonances.