The last decade has witnessed great experimental progress that has led to measurements of
near-threshold cross sections—polarized as well as unpolarized—of high accuracy for …

A review of the present understanding of η′ and η meson physics and these mesons as a
probe of gluon dynamics in low-energy QCD is presented. Recent highlights include the …

Total and differential cross sections for the dp→ He3η reaction have been measured near
threshold for He3 center-of-mass momenta in the range from 17.1 MeV/c to 87.5 MeV/c. The …

We argue that η bound states in nuclei are sensitive to the singlet component in the η. The
bigger the singlet component, the more attraction and the greater the binding. Thus …

The production of η and η′ mesons in photon-and hadron-induced reactions on free and
quasi-free nucleons and on nuclei is reviewed. The extensive database on γ N→ η N, for …

Coherent photoproduction of η-mesons off 3He, ie the reaction γ3He→ η3He, has been
investigated in the near-threshold region. The experiment was performed at the Glasgow …

An exclusive measurement of the excitation function for the dd→ 3 He p π− reaction was
performed at the Cooler Synchrotron COSY-Jülich with the WASA-at-COSY detection …

The production of η′ mesons in photon-and hadron-induced reactions has been revisited
in view of the recent additions of high-precision data to the world data base. Based on an …

Recent results for the photoproduction of mesons off nuclei are reviewed. These
experiments have been performed for two major lines of research related to the properties of …

Taking advantage of both the high mass resolution of the COSY-11 detector and the high
energy resolution of the low-emittance proton beam of the cooler synchrotron COSY, we …