Gießen 2007 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 45: Elektromagnetische und Hadronische Sonden

HK 45.2: Vortrag

Donnerstag, 15. März 2007, 14:30–14:45, A

Measurement of the reaction dd→ α K⁺K⁻ with ANKE/COSY — •Xiauhua Yuan for the ANKE collaboration — IMP, Lanzhou, China — IKP, FZ-Jülich

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 be a direct indication of IV.

An experiment on the reaction dd→ α (π0η) is under preparation for WASA. As a first step, a measurement of the dd→ α f₀→ α K⁺K⁻ cross section has been performed with ANKE in spring 2006. An upper limit of 100 dd→ α K⁺K⁻ events has been obtained from a first data analysis. The present status of the analysis will be presented.

This work is supported by DAAD.