Proton-antiproton annihilation into neutral strange mesons

In a search for gluonic hadrons, the formation channels pp → K s K s , pp → ηη, pp → π 0 η and pp → π 0 π 0 were studied in the mass range from 2.1 to 2.4 GeV using the Jetset (PS202) detector and an internal molecular hydrogen cluster jet target installed in the Low Energy Antiproton Ring (LEAR) at CERN. Cross sections for pp → K s K s have been obtained and limits are set on the non-observation of the ξ(2230). Conversely, we find evidence for a narrow signal in a preliminary analysis of our pp → ηη data consistent with a narrow ξ(2230).