Gießen 2007 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 13: Physik mit schweren Ionen

HK 13.2: Vortrag

Dienstag, 13. März 2007, 14:30–14:45, F

Measurement of strange baryon resonances in heavy ion collisions — •Xavier Lopez for the FOPI collaboration — Gesellschaft für Schwerionenforschung, Planckstr. 1, 64291 Darmstadt, Germany

In-medium modifications of the production and propagation of strange particles in hot and dense nuclear matter [1] is one of the main topics in relativistic heavy-ion collisions. At SIS energies, complex mechanisms like strangeness exchange reaction (π+Y↔K⁻+B) complicate the interpretation of existing data [2], e.g. recent theoretical calculations predict an important coupling of the K⁻ with the Σ(1385) in the medium [3]. Therefore a systematic study of strange baryon resonances is needed to achieve a better understanding of strangeness production close to threshold.

The FOPI detector at the SIS accelerator of GSI-Darmstadt allows to measure and reconstruct a large variety of strange particles. Different excited states of strange baryon resonances like Σ(1385), K(892), H-dibaryons [4] and hypertritons have decay channels that allow their detection in large statistics data samples. The evidence for the resonances in the Ni+Ni and Al+Al systems at 1.9 AGeV will be presented.

(Work supported by BMBF (06HD155))

[1] J. Schaffner et al., Nucl. Phys. A 625, 325 (1997).

[2] W. Cassing et al., Nucl. Phys. A 727, 59 (2003).

[3] M.F.M. Lutz et al., Nucl. Phys. A 700, 193 (2002).

[4] R.L. Jaffe, Phys. Rev. Lett. 38, 195 (1977).