The $\eta$- and ${\eta }^{\prime }$-nucleus interactions and the search for $\eta$, ${\eta }^{\prime }$- mesic states

Steven D. Bass, Volker Metag, Pawel Moskal

The isoscalar $\eta$ and ${\eta }^{\prime }$ mesons are special in QCD, being linked both to chiral symmetry and to non-perturbative glue associated with the axial anomaly. The properties of these m…