Eta-etaprime mixing in eta-mesic nuclei

TL;DR

This paper investigates how eta-etaprime mixing influences eta-mesic nuclei, revealing that mixing significantly enhances attraction and binding, which impacts the eta-nucleon scattering length estimation.

Contribution

It demonstrates, using the Quark Meson Coupling model, that eta-etaprime mixing doubles the predicted attraction compared to a pure octet eta scenario.

Findings

Mixing increases attraction in eta-mesic nuclei.

Enhanced eta-nucleon scattering length due to mixing.

Mixing effect is significant for understanding eta binding.

Abstract

Eta bound states in nuclei are sensitive to the flavour-singlet component in the eta. The bigger the singlet component, the more attraction and the greater the binding. eta-etaprime mixing plays an important role in understanding the value of the eta-nucleon scattering length a_{\eta N}. Working with the Quark Meson Coupling model, we find a factor of two enhancement from mixing relative to the prediction with a pure octet eta.