Gießen 2007 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 49: Poster
HK 49.5: Poster
Donnerstag, 15. März 2007, 16:00–17:00, P
a0/f0(980) production in pp, pn and dd interactions at ANKE/COSY — •Alexey Dzyuba for the ANKE collaboration — Institut für Kernphysik, Forschungszentrum Jülich, Germany — High Energy Physics Department, Petersburg Nuclear Physics Institut, Gatchina, Russia
Strangeness decays of the a0/f0(980) resonances are curently investigated in pp, pn and dd interactions close to KK threshold at the ANKE-spectrometer in an internal-beam experiment, at the Cooler Synchrotron (COSY). The variation of the initial state allows for selectiv production of the a0 (reaction pp→ dK+K0), f0 (dd→4HeK+K−), or both of them in the reaction pn→ dK+K−.
The differential spectra which have been measured for the reaction pp→ dK+K0 at two beam energies allow one to extract the contribution of kaon-pair production in relative S-wave. An independent analysis of these two data sets shows that the spectra can be explained without including a Flatte amplitude, but the combined analysis needs some resonance contribution, probably including interference with nonresonant KK production in S-wave.
The energy dependence of the pp→ dK+K0 total crossection has been used in order to separate different isospin KK contributions to the reaction pn→ dK+K−.
The data for the reaction dd→4HeK+K− are characterized by very small number of useful events. However, at best an upper limit for the total cross section can be determined.