The search for a quasi bound η meson in atomic nuclei is reviewed. This tentative state is
studied theoretically as well as experimentally. The theory starts from elastic η nucleon …

A recently proposed method, based on dispersion theory, that allows the scattering length of
a hadronic two-body system to be extracted from corresponding final-state interactions is …

The optical potential approach for low-energy scattering of η mesons on three-body nuclei is
compared to an exact treatment of the η 3 N system using four-body scattering theory with …

In a recent paper by the TAPS collaboration\cite {exp} a first measurement of a bound
system of an $\eta $ meson and a ${^ 3} $ He nucleus was reported. In this comment we …

The possible existence of η-mesic nuclei poses an interesting and still open issue of
research. Since the occurence of such η-nucleus bound states is reflected in the …

AK-matrix formalism is used to relate the amplitudes for the three reactions pd→ He 3 η, π+
H 3→ He 3 η, and pd→ H 3 π+. Free parameters are fitted to the available experimental data …

The η− 3 N interaction is studied within the four-body scattering theory adopting purely
separable forms for the two-and three-body subamplitudes, limiting the basic two-body …

A microscopic few-body description of near-threshold coherent photoproduction of the η
meson on tritium and 3He targets is given. The photoproduction cross section is calculated …

A microscopic few-body description of near-threshold coherent photoproduction of the eta
meson on tritium and 3He targets is given. The photoproduction cross-section is calculated …

Threshold enhancements in reactions leading to the d-η [1, 2, 3, 4], 3He-η [5, 6] and 4He-η
[7, 8] final states clearly show the low energy η-nucleus interaction to be strong and …