Search for the H dibaryon in (K^{-},K^{+}) reactions

We have studied (${\mathit{K}}^{\mathrm{-}}$,${\mathit{K}}^{+}$) reactions from an emulsion target. The S=-2 H dibaryon has been searched for by the analysis of the ${\mathit{K}}^{+}$ momentum spectrum together with emulsion data. No evidence of H production was observed in the mass range of 1.90–2.16 GeV/${\mathit{c}}^2$. Upper limits for the production cross section of the H are (0.2–0.6)% of that for the quasifree ${\mathrm{\Xi }}^{\mathrm{-}}$ production at the 90% confidence level.