Mesons in Nuclei and Partial Restoration of Chiral Symmetry

TL;DR

This paper explores how partial restoration of chiral symmetry in nuclear matter affects meson properties, emphasizing the importance of wave function renormalization and discussing changes in specific mesons like ar, ta, K+, and ta' in nuclei.

Contribution

It highlights the role of partial chiral symmetry restoration and wave function renormalization in understanding meson behavior in nuclear media, focusing on specific mesons.

Findings

Partial restoration of chiral symmetry occurs in finite nuclear density.

Wave function renormalization significantly impacts meson properties.

Meson properties such as mass and decay constants are modified in nuclear medium.

Abstract

Recent topics on mesons in nuclei are discussed by especially emphasizing the role of the partial restoration of chiral symmetry in the nuclear medium. The spontaneously broken chiral symmetry in vacuum is considered to be incompletely restored in finite nuclear density systems with moderate reduction of the magnitude of the quark condensate. On the partial restoration of chiral symmetry, the wave function renormalization is important to be taken into account for the Nambu-Goldstone bosons. We also discuss the possible change of the meson properties in the nuclear medium and meson-nucleus systems for the $\bar K$, $\eta$, $K^{+}$ and $\eta^{\prime}$ mesons.