Berlin 2005 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 9: Elektromagnetische und Hadronische Proben
HK 9.7: Vortrag
Freitag, 4. März 2005, 18:15–18:30, TU MA004
Energy dependence of the pd→3Heη′ production close to threshold. — •H.-H. Adam, A. Khoukaz, R. Santo, and A. Täschner — Institut für Kernphysik, Universität Münster, Germany
Measurements on the near-threshold production of neutral mesons in the reaction channel pd→3He X0 (X0 = η, ω, η′, φ) are of general interest for many reasons. This reaction channel might be well suited for rare decay studies of neutral mesons and furthermore, in case of e.g. the η-meson production recent measurements resulted in data that are remarkable for both their strength and energy dependence. The observed rapid decrease of the production amplitude squared |f|2 with increasing excess energy at threshold was found to be dominated by a strong 3He-η final state interaction and the presence of N*(1535) resonance. In contrast to this, only little is known for the corresponding case of the η′ meson production.
New data close to threshold are under evaluation by the COSY-11 collaboration, in order to study the corresponding production amplitude with respect to the absolute scale and a possible deviation from phase-space expectations, similar to the η case. The determination of the excitation function in the near-threshold region is also desirable for studies on the dominant production mechanism and for the confirmation of theoretical predictions.
Newest results on our investigations on the pd→3He η′ excitation function close to threshold at excess energies up to 10 MeV, using the COSY-11 installation, will be presented. This work is supported by FZ Jülich.