1208.0982 (Daisuke Jido et al.)

eta' meson under partial restoration of chiral symmetry in nuclear
medium    [PDF]

Daisuke Jido, Hideko Nagahiro, Satoru Hirenzaki, Shuntaro Sakai

We shed light upon the eta' mass in nuclear matter in the context of partial restoration of chiral symmetry, pointing out that the U_{A}(1) anomaly effects causes the eta'-eta mass difference necessarily through the chiral symmetry breaking. As a consequence, it is expected that the eta' 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. [1].

View original: http://arxiv.org/abs/1208.0982