Nuclear bound state of eta'(958) and partial restoration of chiral symmetry in the eta' mass

Abstract

The in-medium mass of the ${\eta }^{\prime }$ meson is discussed in a context of partial restoration of chiral symmetry in nuclear medium. The ${\eta }^{\prime }$ mass is expected to be reduced by order of 100 MeV at the saturation density. The reduction is a consequence of the suppression of the anomaly effect on the ${\eta }^{\prime }$ mass induced by partial restoration of chiral symmetry. This strong attraction in ${\eta }^{\prime }$ nuclear systems does not accompany large absorption of ${\eta }^{\prime }$ into nuclear matter. This leads to the possibility of so narrow bound states of the ${\eta }^{\prime }$ meson in nuclei to be seen in hadronic reactions with light nuclear targets.

5 pages, 2 figures, accepted version

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• Spectroscopy of ${\eta }^{\prime }$-nucleus bound states at GSI and FAIR --- very preliminary results and future prospects ---
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