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

TL;DR

This paper explores how partial restoration of chiral symmetry in nuclear matter can lead to a significant reduction in the eta' meson mass, highlighting the role of the U_{A}(1) anomaly in this process.

Contribution

It demonstrates that the eta' meson mass decreases by about 100 MeV in nuclear matter due to partial chiral symmetry restoration and anomaly effects.

Findings

Eta' mass reduces by approximately 100 MeV in nuclear matter.

U_{A}(1) anomaly effects influence the eta'-eta mass difference.

Chiral symmetry restoration impacts meson properties in nuclear medium.

Abstract

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].