{eta}- and {eta}{sup '}-mesic nuclei and U{sub A}(1) anomaly at finite density
- Research Center for Nuclear Physics(RCNP), Osaka University, Ibaraki, Osaka, 567-0047 (Japan)
- Showa Pharmaceutical University, Machida, Tokyo, 194-8543 (Japan)
- Department of Physics, Nara Women's University, Nara, 630-8506 (Japan)
We discuss theoretically the possibility of observing the bound states of the {eta} and {eta}{sup '}(958) mesons in nuclei. We apply the NJL model to study the {eta} and {eta}{sup '} meson properties at finite density and calculate the formation cross sections of the {eta} and {eta}{sup '} bound states with the Green function method for ({gamma},p) reaction. We also discuss the experimental feasibility at photon facilities like SPring-8. The contributions due to the {omega} meson production are also included to obtain the realistic ({gamma},p) spectra. We conclude that we can expect to observe resonance peaks in ({gamma},p) spectra for the formation of meson bound states and we can deduce new information on {eta} and {eta}{sup '} properties at finite density. These observations are believed to be essential to know the possible mass shift of {eta}{sup '} and deduce new information on the effective restoration of the U{sub A}(1) anomaly in the nuclear medium.
- OSTI ID:
- 20863886
- Journal Information:
- Physical Review. C, Nuclear Physics, Vol. 74, Issue 4; Other Information: DOI: 10.1103/PhysRevC.74.045203; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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