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The $\eta'$ mass reduction in the nuclear medium is expected from thedegeneracy of the pseudoscalar-singlet and octet mesons when chiral symmetry ismanifest. In this study, we investigate the $\eta'N$ 2body interaction which isthe foundation of the in-medium $\eta'$ properties using the linear sigma modelas a chiral effective model. The $\eta'N$ interaction in the linear sigma modelcomes from the scalar meson exchange with U$_A$(1) symmetry effect and is foundto be fairly strong attraction. Moreover, the $\eta N$ transition is includedin our calculation, and is important for the imaginary part of the$\eta'$-optical potential. The transition amplitude of $\eta'N$ to the $\eta N$channel is relatively small compared to that of elastic channel. From theanalysis of the $\eta'N$ 2body system, we find a $\eta'N$ bound state with thebinding energy $12.3-3.3i$MeV. We expect that this strongly attractive two bodyinteraction leads to a deep and attractive optical potential.

The $\eta'N$ interaction from a chiral effective model and $\eta'$-$N$ bound state