Coupled-channel effects in the pp -> ppK+K- reaction
  The cross sections for the pp -> ppK+K- reaction were measured at three beam energies 2.65, 2.70, and 2.83 GeV at the COSY-ANKE facility. The shape of the K+K- spectrum at low invariant masses largely reflects the importance of K\bar{K} final state interactions. It is shown that these data can be understood in terms of an elastic K+K- rescattering plus a contribution coming from the production of a K0\bar{K}0 pair followed by a charge-exchange rescattering. Though the data are not yet sufficient to establish the size of the cusp at the K0\bar{K}0 threshold, the low mass behaviour suggests that isospin-zero production is dominant. 
A. Dzyuba, M. Buescher, M. Hartmann, I. Keshelashvili, V. Koptev, Y.   Maeda, A. Sibirtsev, H. Stroeher, C. Wilkin