Kaon-hyperon production in proton-proton scattering has been
studied in the
reaction channels close to threshold.
At equal excess energies (Q ~ 13 MeV), Lambda
production is found to be favoured over Sigma0
production by a factor 28 (+6,-9) and thus
exceeding the known high energy (Q > 300 MeV)
ratio by an order of magnitude.
Experiments were performed using the internal COSY-11 facility at the cooler synchrotron COSY Jülich. Results are presented and physics implications for the underlying reaction mechanisms are discussed.
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Publication: Proceedings 'Hadrons in Dense Matter', GSI Darmstadt, ISSN 0720-8715, p. 27-34