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QCD symmetries in η- and η′-mesic nuclei
(Institute of Physics Jagiellonian University, 2014) Bass, S.; Thomas, A.; 2nd International Symposium on Mesic Nuclei (22 Sep 2013 - 25 Sep 2013 : Krakow, POLAND)
We discuss the role of QCD symmetries and confinement in understanding η- and η′-mesic nuclei. η and η′ bound states in nuclei are sensitive to the flavour-singlet component in the meson. The bigger the singlet component, the more attraction and the greater the binding. Recent results on the η′ mass in nuclei from the CBELSA/TAPS Collaboration are very similar to the prediction of the Quark Meson Coupling model. In the model, η–η′ mixing induces a factor of two enhancement of the η-nucleon scattering length aηN relative to the prediction with a pure octet η with real part about 0.8 fm.