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Description
The in-medium modification of the spectral function of the η' meson is studied based on the Tρ approximation by employing two models; one is called η'N-scattering model and the other the N(1895)-dominance model. In the η'N-scattering model, one single peak of the in-medium η' mode appears in the spectral function and the peak position shifts to higher energies along with the increase of the nuclear density reflecting the repulsive η'N scattering length. On the other hand, two branches related to the η' mode and N(1895)-hole mode appears in the N(1895)-dominance model. Once the spatial momentum is turned on, the peak positions in the spectral function approach the energies without the nuclear medium effect. Particularly, in the N(1895)-dominance model, the peak strength of the N(1895)-hole mode gets smaller with the finite momentum and the spectral function comes to have one single peak.
