$\eta$ bound state: theory and experiment

TL;DR

This paper reviews the theoretical predictions and experimental efforts to detect a quasi-bound $ ext{eta}$ meson within atomic nuclei, exploring its existence and properties.

Contribution

It provides a comprehensive overview of both theoretical models and experimental searches for the $ ext{eta}$ bound state in nuclei.

Findings

Theoretical models suggest possible binding of $ ext{eta}$ mesons in nuclei.

Experimental searches have yielded tentative evidence but no definitive confirmation.

The study highlights challenges and future directions in detecting $ ext{eta}$ bound states.

Abstract

The search for a quasi bound $\eta$ meson in atomic nuclei is reviewed. This tentative state is studied theoretically as well as experimentally.