In-medium $\eta^{\prime}$ mass and $\eta^{\prime}N$ interaction based on chiral effective theory

@article{Sakai2013InmediumM,
  title={In-medium \$\eta^\{\prime\}\$ mass and \$\eta^\{\prime\}N\$ interaction based on chiral effective theory},
  author={Shuntaro Sakai and Daisuke Jido},
  journal={Physical Review C},
  year={2013},
  volume={88},
  pages={064906}
}
The in-medium eta' mass and the eta'N interaction are investigated in an effective theory based on the linear realization of the SU(3) chiral symmetry. We find that a large part of the eta' mass is generated by the spontaneous breaking of chiral symmetry through the U_A (1) anomaly. As a consequence of this observation, the eta' mass is reduced in nuclear matter where chiral symmetry is partially restored. In our model, the mass reduction is found to be 80MeV at the saturation density… 
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