Kaon-pair production in hadron-induced reactions

Abstract

An experimental program has been initiated at the Cooler Synchrotron COSY-Jülich — a storage ring for (un-)polarized proton and deuteron beams up to 3.7 GeV/c — to investigate strangeness production in hadron-induced reactions. Besides studies of hyperon-production (pN → KY N, where Y = (Λ,Σ)), measurements of the production of kaon pairs have also been conducted; these comprise: pp → ppK ⁺ K ⁻ below (COSY-11) and above (ANKE) the φ-threshold, pp → dK ⁺ K ⁻ to study a ₀, f ₀, φ-production on the neutron (ANKE), pp → dK ⁺ $\bar K^0$ for kaon-pair production in the a ⁺₀ -channel (ANKE), pd → ³ HeK ⁺ K ⁻ which is sensitive to ³ He $\bar K$ final state interaction (MOMO), and dd → ⁴ HeK ⁺ K ⁻ which filters kaon pairs in the f ₀-channel (ANKE). ANKE, a magnetic spectrometer at an internal target position of COSY, is equipped with detector systems for positively and negatively charged particles. These can detect the kaons and one can reconstruct the intermediate K $\bar K$-states by their invariant mass. Alternatively, the K ⁺ and the two baryons or the nucleus in the final state are detected and the missing mass technique is applied to find the non-observed residuum. In this contribution, the recent ANKE results [1]–[4], as well as plans for future measurements are presented.

For the ANKE Collaboration