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

TL;DR

This paper investigates the $ta'N$ interaction using a chiral effective model, finding a strong attraction that leads to a predicted bound state, which has implications for in-medium $ta'$ properties.

Contribution

It introduces a novel calculation of the $ta'N$ interaction within a linear sigma model, predicting a bound state and deep optical potential.

Findings

Discovery of a $ta'N$ bound state with 12.3 MeV binding energy.

Identification of a strong attractive $ta'N$ interaction.

Implication of a deep optical potential for in-medium $ta'$ mesons.

Abstract

The $\eta'$ mass reduction in the nuclear medium is expected from the degeneracy of the pseudoscalar-singlet and octet mesons when chiral symmetry is manifest. In this study, we investigate the $\eta'N$ 2body interaction which is the foundation of the in-medium $\eta'$ properties using the linear sigma model as a chiral effective model. The $\eta'N$ interaction in the linear sigma model comes from the scalar meson exchange with U$_A$(1) symmetry effect and is found to be fairly strong attraction. Moreover, the $\eta N$ transition is included in 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 the analysis of the $\eta'N$ 2body system, we find a $\eta'N$ bound state with the binding energy $12.3-3.3i$MeV. We expect that this strongly attractive two body interaction leads to a deep and attractive optical potential.