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Köln 2004 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 11: Poster Session: Electromagnetic and Hadronic Probes

HK 11.18: Poster

Tuesday, March 9, 2004, 13:30–15:30, Foyer

Investigation of the Scalar Resonance a0+(980) at ANKE* — •V. Kleber — Institut für Kernphysik, Universität zu Köln, 50937 Köln / Forschungszentrum Jülich, 52425 Jülich

The scalar resonances a0/f0(980) have been observed in many experiments. However, their nature is not yet understood and they are interpreted, e.g., as genuine mesons (and thus members of the scalar nonet), KK molecules or compact qqqq states. At COSY–Jülich an experimental program has been started, using the ANKE spectrometer, which aims at exclusive data on a0/f0 production from pp, pn, pd and dd interactions close to the KK threshold. The final goal will be the extraction of the charge-symmetry breaking a0/f0 mixing amplitude to shed light on the nature of the light scalar resonances. Here, we report about the first exclusive study of the reactions ppdK+K^0 and ppdπ+η. The measurements were performed at beam energies of Tp=2.65 and 2.83 GeV, corresponding to excess energies of 46 and 103 MeV above the KK threshold. From the measurement at the lower energy the total cross section of the reaction ppdK+K^0 as well as differential distributions have been extracted. The main contribution to this reaction is interpreted as a0K+K0 decays. The large background contribution from multiple-pion production to the reaction ppdπ+η makes the analysis more complex than in the case of kaon production. The data at the higher energies are still under analysis, and the current status will be presented. * supported by FZJ, BMBF and DPG

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