Study of the eta meson production with the polarised proton beam

TL;DR

This paper investigates eta meson production using polarized proton beams and the WASA detector to analyze partial wave contributions and reaction dynamics, providing insights into eta-proton interactions.

Contribution

It introduces a method to determine partial wave contributions in eta production through interference terms, advancing understanding of reaction mechanisms.

Findings

Partial wave interference terms identified

Energy and angular dependence characterized

Eta-proton interaction insights gained

Abstract

The azimuthally symmetric WASA detector and the polarised proton beam of COSY, enable investigations of energy and angular dependence of the beam analysing power in the pp --> ppeta reaction. The aim of the studies is the determination of the partial wave contributions via interference terms which are inaccessible from spin averaged observables. The partial wave decomposition is mandatory for the understanding of the reaction dynamics and for the determination of the eta-proton interaction, independently of the theoretical paradigm used.