eta' Production in Proton-Proton Scattering Close to Threshold


The pp->ppeta'(958) reaction has been measured at COSY using the internal beam and the COSY-11 facility. The total cross sections at the four different excess energies 1.5 MeV, 1.7 MeV, 2.9 MeV, and 4.1 MeV have been evaluated to be 2.5±0.5 nb, 2.9±1.1 nb, 12.7±3.2 nb, and 25.2±3.6 nb, respectively. In this region of excess energy the eta'(958) cross sections are much lower compared to those of the pi0 and eta production.

Preprint: FZJ-IKP(I)-1997-2 in PostScript format (168kB)
Publication: Phys.Rev.Lett. 80 (1998) 3202-3205