Proton-proton collisions at production thresholds
  Recent results obtained by the COSY-11 collaboration concerning the production of eta and eta' mesons in the pp --> pp Meson reaction are presented. A comparison of the production amplitude for the pi(0), eta and eta' mesons at the same phase space volume allows to conclude that the proton-eta' interaction is in the order of, or smaller than, the proton-pi(0) one. A total cross section determined in a preliminary analysis of the data of elementary kaon and antikaon production via the pp-->ppK(+)K(-) reaction measured at excess energy of Q = 17 MeV is reported. 
P. Moskal, H.-H. Adam, A. Budzanowski, D. Grzonka, L. Jarczyk, A.   Khoukaz, K. Kilian, M. Koehler, P. Kowina, N. Lang, T. L...