Resonance dynamics in the coherent $\eta$ meson production in the $(p,p^\prime)$ reaction on the spin-isospin saturated nucleus

TL;DR

This paper investigates the resonance dynamics and interference effects in coherent $ ext{eta}$ meson production via the $(p,p')$ reaction on a spin-isospin saturated nucleus, emphasizing the role of the $N(1520)$ resonance.

Contribution

It provides a detailed analysis of resonance contributions, including nucleon Born terms, and highlights the significance of the $N(1520)$ resonance in the reaction mechanism.

Findings

Resonance dynamics significantly influence the cross section.

Interference effects between different resonances are crucial.

Cross section sensitivity to hadron-nucleus interactions is demonstrated.

Abstract

For the forward going proton and $\eta$ meson, the coherent $\eta$ meson production in the $(p,p^\prime)$ reaction on the spin-isospin saturated nucleus occurs only due to the $\eta$ meson exchange interaction between the beam proton and nucleus. In this process, the nucleon in the nucleus can be excited to resonances $N^*$ and the $\eta$ meson in the final state can arise due to $N^* \to N\eta$. We investigate the dynamics of resonances, including nucleon Born terms, and their interferences in the coherently added cross section of this reaction. We discuss the importance of $N(1520)$ resonance and show the sensitivity of the cross section to the hadron nucleus interaction.