A measurement of the (p)over-bar-p -> KsKs eta cross section at beam momenta around 1.6 GeV/c

The PS185 experiment at LEAR/CERN has studied strangeness production in (p) over barp collisions with final states such as <(<Lambda>)over bar>Lambda, <(<Sigma>)over bar>(0)Lambda + c.c, <(<Sigma>(+))over bar>Sigma (+), <(<Si gma>(-))over bar>Sigma (-) and KSKS. The hyperon polarisation in the reacti on (p) over bar C-12 --> <(<Lambda>)over bar>LambdaX was studied in a recen t analysis. As a spin-off, about 32,000 KSKSX events could be extracted whi ch come either from (p) over barp or (p) over bar C-12 interactions. We fin d peaks at 555 MeV/c(2) and 786 MeV/c(2) in the missing mass distributions which are attributed to the (p) over barp --> K(s)K(s)eta and (p) over barp --> K(s)K(s)omega reactions respectively. We obtain sigma ((p) over barp --> K(S)K(S)eta) = (2.78 +/- 0.19 +/- 0.55)m ub at p((p) over bar) approximate to 1.6 GeV/c when normalising to the know n cross section for (p) over barp --> K(s)K(s)omega.