Bochum 1998 – wissenschaftliches Programm

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HK: Hadronen und Kerne

HK 12: Heavy Ion Reactions II, Ultrarelativistic Energies

HK 12.1: Gruppenbericht

Montag, 16. März 1998, 17:00–17:30, P

Studies of Au+Au collisions at 6, 8 and 10.8 AGeV at the AGS — •A. Gillitzer — Physik-Department E12, Technische Universität München, D-85748 Garching, Germany

In a 3 months beamtime from November 1996 data were taken with the E802 spectrometer [1] at the AGS for Au+Au collisions at incident energies of 6, 8, and 10.8 AGeV. Experiment E917, a successor experiment of E866 [2], has two main objectives, namely studies of the excitation function of particle production and collective flow phenomena and, at the full energy, the investigation of the possible medium modification of the φ meson. Indications for a shift of the φ mass in Si+Au collisions were discussed in previous studies [3]. Compared to previous experiments the statistics of accumulated φ→K⁺K⁻ events has been considerably increased. The sensitivity of the experiment for the observation of a possible φ mass shift in the φ→K⁺K⁻ decay is discussed in comparison to simulations. Other aspects of the experiment are the production of multistrange baryons such as Ξ and strange antibaryons such as Λ and Ξ, and correlations of identical particles including K⁻K⁻ and of non-identical particles. The instrumental improvements of the setup and first results of the data analysis will be presented.

[1] T. Abott et al., Nucl. Instr. Meth. A290 (1990) 41

[2] L. Ahle et al., Nucl. Phys. A610 (1996) 139c

[3] Y. Wang et al., Nucl. Phys. A590 (1995) 539c