Complete Angular Distributions of the Deuteron Photo-Disintegration Reaction in the Few GeV Region

TL;DR

This paper presents comprehensive angular distribution measurements of deuteron photo-disintegration in the few GeV energy range, aiming to understand the transition from meson exchange to QCD descriptions.

Contribution

It provides experimental data that help compare meson exchange models and QCD-inspired models in the transition region.

Findings

Data covers a wide angular range at high energies.

Results inform the energy region where meson exchange models break down.

Findings support the transition from meson exchange to QCD regimes.

Abstract

The study of two body deuteron photo-disintegration is ideal for investigating the transition region from meson exchange to the Quantum Chromo Dynamics (QCD) regime because of its simplicity and amenability to calculation. In the past years, the theoretical efforts have been focused in two different directions: extending at higher energies the models based on meson exchange, and improving the models inspired by QCD principles to extrapolate their predictions at lower energies, in order to find out the approach that best describes the experimental data and in which energy region the transition between the two descriptions takes place.