Comparative study of the proton-η and proton-η′ interactions via the pp and p-meson invariant mass distributions measured at COSY-11.

The COSY-11 collaboration has performed measurements of pp→ppη and pp→ppη′ reactions at the excess energy Q = 15.5 MeV. The determined pp and p—meson invariant mass distributions are used for comparative study of the interaction within proton—meson system. Presently we are finishing the analysis of the pp→ppη′ reaction and the resulted preliminary invariant mass distributions will be presented and compared to the theoretical predictions and to the corresponding spectra for the ppη system. [ABSTRACT FROM AUTHOR]