Formation of η'(958)-mesic nuclei and axial U_A(1) anomaly at finite density

Abstract

We discuss the possibility to produce the bound states of the ${\eta }^{\prime }(958)$ meson in nuclei theoretically. We calculate the formation cross sections of the ${\eta }^{\prime }$ bound states with the Green function method for ($\gamma$,p) reaction and discuss the experimental feasibility at photon facilities like SPring-8. We conclude that we can expect to observe resonance peaks in ($\gamma$,p) spectra for the formation of ${\eta }^{\prime }$ bound states and we can deduce new information on ${\eta }^{\prime }$ properties at finite density. These observations are believed to be essential to know the possible mass shift of ${\eta }^{\prime }$ and deduce new information of the effective restoration of the chiral $U_A(1)$ anomaly in the nuclear medium.

4 pages, 3 figures

References in corpus (6)

• A reggeized model for eta and eta-prime photoproduction
• Pseudoscalar neutral mesons in hot and dense matter
• eta-Nucleus interactions and in-medium properties of N*(1535) in chiral models
• Effective restoration of the U_A(1) symmetry with temperature and density
• Testing Chiral Dynamics in Pionic Atoms
• Photoproduction of eta-prime-mesons from the Proton

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