η' meson under partial restoration of chiral symmetry in nuclear medium*
1 Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502, Japan
2 Department of Physics, Nara Women’s University, Nara 630-8506, Japan
3 Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
a e-mail: email@example.com
We shed light upon the η' mass in nuclear matter in the context of partial restoration of chiral symmetry, pointing out that the UA(1) anomaly effects causes the η'-η mass difference necessarily through the chiral symmetry breaking. As a consequence, it is expected that the η' mass is reduced by order of 100 MeV in nuclear matter where partial restoration of chiral symmetry takes place. The discussion given here is based on Ref. 
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