Lambda-Hyperon Production via the pp->pK+Lambda Reaction 2 MeV above Threshold


The pp->pK+Lambda reaction was measured at COSY with a proton beam momentum of 2.345 GeV/c, i.e. with an excess energy of 2 MeV above threshold. The total cross section was determined to be 8.2±1.8 nb. The present data point close to the production threshold indicates, that existing phenomenological parametrizations of the total kaon production cross section are insufficient.

Preprint: KFA-IKP(I)-1996-3 in PostScript format (231kB)
Publication: Phys.Lett. B 388 (1996) 859-865