COMPARATIVE STUDIES OF LOW ENERGY ppη AND ppη' SYSTEMS WITH THE COSY-11 DETECTOR

摘要

We present a comparison of the two-body invariant mass distributions for the pp → ppη and pp → ppη' reactions, both measured at a nominal excess energy value of Q = 15.5 MeV. For the pp → ppη reaction, in addition, the differential cross-sections were extracted for an excess energy of Q = 10 MeV. The comparison of the results for the η and η' meson production rather excludes the hypothesis that the enhancement observed in the invariant mass distributions is due to the interaction of the meson and the proton.