The role of the $P_{11}(1710)$ in the $NN{\to}N{\Sigma}K$ reaction
  Using the resonance model, which was successfully applied for the study of the $pp{\to}p{\Lambda}K^+$ reaction, we investigate $NN{\to}N{\Sigma}K$ reactions that should provide cleaner information about resonance excitations and meson exchange contributions. For this purpose we demonstrate that the invariant mass distribution for the ${\Sigma}K$ system, as well as the Dalitz plot for the $NN{\to}N{\Sigma}K$ reaction, provide direct information about the ${\Sigma}K$ production mechanism, which can be tested in the near future by experiments at COSY. 
A. Sibirtsev (Giessen U.), K. Tsushima (Adelaide U.) W. Cassing   (Giessen U.), A. W. Thomas (Adelaide U.)