Hyperon and charged kaon pair production close to threshold

Wolke, M.; Adam, H.-H.; Balewski, J. T.; Budzanowski, A.; Goodman, C.; Grzonka, D.; Jarczyk, L.; Jochmann, M.; Khoukaz, A.; Kilian, K.; Ko¨hler, M.; Kowina, P.; Lister, T.; Moskal, P.; Lang, N.; Oelert, W.; Quentmeier, C.; Santo, R.; Schepers, G.; Seddik, U.
June 2000
AIP Conference Proceedings;2000, Vol. 512 Issue 1, p143
Academic Journal
Close-to-threshold data on the elementary kaon and antikaon production channels in the proton-proton interaction have been taken using the COSY-11 installation at the cooler synchrotron COSY Ju¨lich. The experimental technique applied at the internal COSY-11 facility—designed for meson production studies at small excess energies—is outlined. The threshold excitation functions for the kaon-hyperon production via the reactions pp→pK[sup +]Λ and pp→pK[sup +]Σ[sup 0] are presented. The magnitude of the production amplitudes is compared at equal excess energies and physical implications of the observed Σ[sup 0] suppression in the threshold region are discussed. In addition, within a Dalitz plot analysis the spin-averaged S-wave scattering parameters could be extracted for the Λ-p channel. With the possibility of detecting all final state particles the elementary antikaon production in the reaction pp→ppK[sup +]K[sup -] has been investigated. Results on the exclusive total cross section fix the scale of the strangeness dissociation into two kaons. © 2000 American Institute of Physics.


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