Analysis of the Reaction: $np \rightarrow np \pi^+ \pi^-$ from the Point of View of Oper-Model

TL;DR

This paper analyzes the $np ightarrow np \pi^+ \pi^-$ reaction across different neutron momenta, demonstrating that at high energies it aligns with the OPER model, while at lower energies additional mechanisms are needed.

Contribution

It introduces a combined approach using OPER and OBE models to describe the reaction at various incident neutron momenta.

Findings

At momenta above 3 GeV/c, the reaction characteristics fit the reggeized π exchange model.

Below 3 GeV/c, the one baryon exchange mechanism is necessary for accurate description.

The study clarifies the energy-dependent mechanisms governing the reaction.

Abstract

The reaction $np \rightarrow np \pi^+ \pi^-$ was studied at the various momenta of incident neutrons. It was shown that the characteristics of the reaction at the momenta above 3 GeV/c could be described by the model of reggeized $\pi$ exchange (OPER). At the momenta below 3 GeV/c, it was necessary to use additionally the mechanism of one baryon exchange (OBE).