Isospin dependence of the eta meson production in hadronic collisions

TL;DR

This paper investigates the isospin dependence of eta meson production in hadronic collisions, using recent experimental data to analyze cross section ratios and their energy dependence through a specific theoretical parametrization.

Contribution

It provides the first determination of the isospin I=0 component of the total cross section for NN-->NN eta reactions near threshold using recent COSY-11 data.

Findings

The I=0 component of the cross section is quantified.

Energy dependence of cross section ratios is well described by the Faldt and Wilkin parametrization.

Results improve understanding of eta meson production mechanisms.

Abstract

Based on recent COSY-11 results of measurements of total cross sections for the quasi-free pn-->pn eta reaction we determine the isospin I=0 component of the total cross section for the NN-->NN eta reaction down to the threshold. We show that the energy dependence of the total cross section ratios {\sigma_{I=0}(pn-->pn eta)}/{\sigma(pp-->pp eta)} and \sigma_{I=0}(pn-->pn eta)}/{\sigma(pn-->d eta)} can be described using the Faldt and Wilkin analitical parametrization of the nucleon-nucleon final state interaction.