Q. J. Ye, M. Hartmann, D. Chiladze, S. Dymov, A. Dzyuba, H. Gao, R. Gebel, V. Hejny, A. Kacharava, B. Lorentz, D. Mchedlishvili, S. Merzliakov, M. Mielke, S. Mikirtytchiants, H. Ohm, M. Papenbrock, A. Polyanskiy, V. Serdyuk, H. J. Stein, H. Stroeher, S. Trusov, Yu. Valdau, C. Wilkin, P. Wuestner
The pp -> ppK+K- reaction was measured below the phi 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 K0K0bar threshold is much more clear and some evidence is also found for coupling between the K-p and K0bar n channels. However, the energy dependence of the total cross section cannot be reproduced by considering only a simple product of such pair-wise final state interactions.
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http://arxiv.org/abs/1302.7210
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