Darmstadt 2008 – wissenschaftliches Programm
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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 ga0KK and gf0KK are still poorly known.
The isospin-violating (IV) a0/f0 mixing amplitude is in leading order proportional to the product of ga0KK and gf0KK. 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.