Hadrons in nuclei and chiral symmetry in quantum chromodynamics

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The phenomenon of the spontaneous breakdown of chiral symmetry in the QCD vacuum was studied in the aspect of partial restoration of chiral symmetry in nuclear medium. To study the partial restoration, an in-medium chiral effective theory wasdeveloped. The quark condensate and the pion properties in the nuclear medium werecalculated beyond the linear density approximation. The η’ meson in nuclear medium was discussed in the viewpoint of partial restoration of chiral symmetry. It was shown that the η’ meson could have a strong attractive potential in nucleus.