Chodrow plot and the interaction of K+K−

Measurements of the pp→ ppK+K− reaction, performed with the experiment COSY-11 at the Cooler Synchrotron COSY, reveal a significant discrepancy between obtained excitation function and theoretical expectations neglecting interactions of kaons. Thus, the observed enhancement of the data above the predictions may be plausibly assigned to the influence of K+K− or K p interaction. This may manifest itself even stronger in the distributions of the differential cross-sections. Therefore, in order to deepen our knowledge about the low energy dynamics of the ppKK system we investigate population of events for the pp → ppK+K− reaction as a function of the invariant masses of two particle subsystems. In particular generalizations of the Dalitz plot for the four particles proposed by Chodrow and Goldhaber will be presented.