Production of K+
pairs in proton-proton collisions below the meson threshold
The pp→ppK+K- reaction was measured below the threshold at a beam energy of 2.568 GeV using the COSY-ANKE magnetic spectrometer. By assuming that the four-body phase space is distorted only by the product of two-body final-state interactions, fits to a variety of one-dimensional distributions permit the evaluation of differential and total cross sections. The shapes of the distributions in the Kp and Kpp invariant masses are reproduced only if the K-p interaction is even stronger than that found at higher energy. The cusp effect in the K+K - distribution at the K0K̄0 threshold is much more clear and some evidence is also found for coupling between the K-p and K̄0n channels. However, the energy dependence of the total cross section cannot be reproduced by considering only a simple product of such pairwise final-state interactions. © 2013 American Physical Society.
Ye, QJ; Hartmann, M; Chiladze, D; Dymov, S; Dzyuba, A; Gao, H; Gebel, R; Hejny, V; Kacharava, A; Lorentz, B; McHedlishvili, D; Merzliakov, S; Mielke, M; Mikirtytchiants, S; Ohm, H; Papenbrock, M; Polyanskiy, A; Serdyuk, V; Stein, HJ; Ströher, H; Trusov, S; Valdau, Y; Wilkin, C; Wüstner, P
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