Dynamics of the near threshold eta meson production in proton-proton interaction

TL;DR

This paper reports measurements of the analyzing power in proton-proton interactions producing eta mesons at near-threshold energies, indicating s-wave dominance in the production mechanism, and interprets results within meson exchange models.

Contribution

It provides new experimental data on analyzing power at specific energies and interprets these results within meson exchange theoretical frameworks.

Findings

Analyzing power values are consistent with zero at both energies.

Eta meson production is predominantly in s-wave.

Results support meson exchange models for eta production.

Abstract

We present the results of measurements of the analysing power for the p(pol)p --> pp eta reaction at the excess energies of Q=10 and 36 MeV, and interpret these results within the framework of the meson exchange models. The determined values of the analysing power at both excess energies are consistent with zero implying that the eta meson is produced predominantly in s-wave.