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HK: Fachverband Physik der Hadronen und Kerne

HK 9: Elektromagnetische und Hadronische Sonden

HK 9.8: Vortrag

Montag, 10. März 2008, 18:15–18:30, 1C

Measurement of the Reaction dd→ α K⁺K⁻ with Anke/Cosy — •Xiaohua Yuan for the ANKE collaboration — Institut für kernphysik, FZ Jülich, D-52425 Jülich, Deutschland

Precise knowledge of the a₀(980) and f₀(980) coupling constants to kaons would allow one to determine the KK content of the a₀/f₀. However, the values for g_a0KK and g_f0KK are still poorly known.

The isospin-violating (IV) a₀/f₀ mixing amplitude is in leading order proportional to the product of g_a0KK and g_f0KK. Since the a₀ and the f₀ are rather narrow overlapping resonances, a₀-f₀ mixing should give the dominant contribution to the IV effect via the reaction chain dd→ α f₀(I=0) → α a₀⁰(I=1) → α (π⁰η). Any observation of π⁰η production in the dd→ α X reaction would thus be a direct indication of IV.

An experiment on the reaction dd→ α (π⁰η) is under preparation for WASA-at-COSY. As a first step, a measurement of the dd→ α f₀→ α K⁺K⁻ cross section has been performed with ANKE in spring 2006. About 10 dd→ α K⁺K⁻ events have been deduced from a preliminary analysis. The present status of the analysis will be presented.

This work is supported by DAAD.