Pseudoscalar meson photoproduction on nucleon target

TL;DR

This paper models pseudoscalar meson photoproduction on nucleons using the Quark-Gluon String model, emphasizing the importance of planar diagrams at low energies and comparing predictions with experimental data.

Contribution

It introduces a method to incorporate planar diagrams into the Quark-Gluon String model for gamma-p collisions at low energies, extending previous approaches.

Findings

Model predictions align with SLAC experimental data.

Planar diagrams significantly impact meson production at low energies.

Predictions for HERMES energies are provided.

Abstract

We consider the photoproduction of secondary mesons in the framework of the Quark-Gluon String model. At relatively low energies, not only cylindrical, but also planar diagrams have to be accounted for. To estimate the significant contribution of planar diagrams in gamma-p collisions at rather low energies, we have used the expression obtained from the corresponding phenomenological expression for pi-p collisions. The results obtained by the model are compared to the existing SLAC experimental data. The model predictions for light meson production at HERMES energies are also presented.