Regge phenomenology of pion photoproduction off the nucleon at forward angles

TL;DR

This paper develops a parameter-free Regge model for pion photoproduction off nucleons at forward angles, accurately predicting cross sections and polarization asymmetries without fitting to data.

Contribution

It introduces a novel Regge model that uses empirically determined coupling constants, eliminating the need for parameter fitting in pion photoproduction analysis.

Findings

Accurately reproduces experimental cross sections and asymmetries

Uses coupling constants from decay widths and SU(3) relations

Achieves better agreement with data without fitting

Abstract

We present a Regge model for pion photoproduction which is basically free of parameters within the framework of the s-channel helicity amplitude. We use coupling constants of all exchanged mesons determined from empirical decay widths or from the SU(3) relations together with consistency check with existing estimates that are widely accepted in other reaction processes. Cross sections and spin polarization asymmetries at various photon energies are analyzed and results are obtained in better agreement with experimental data without referring to any fitting procedure.