Amplitudes ratios in $\rho^0$ leptoproductions and GPDs

TL;DR

This paper models exclusive $ ho^0$ meson leptoproduction using the handbag approach, achieving good agreement with experimental data and predicting helicity amplitude ratios consistent with HERMES measurements.

Contribution

It introduces a model for $ ho^0$ leptoproduction within the handbag framework that accurately reproduces experimental observables and predicts helicity amplitude ratios.

Findings

Model agrees with experimental data across a wide energy range.

Predicted helicity amplitude ratios match HERMES measurements.

Provides insights into the underlying GPDs in exclusive meson production.

Abstract

We investigate exclusive leptoproduction of $\rho^0$ meson. These reactions were analyzed within the factorizing handbag approach. In our model good agreement of observables for light meson production with experimental data in a wide energy range was found. Using the model results we calculate the ratio of different helicity amplitudes for a transversely polarized proton target to the leading twist longitudinal amplitude. Our results are close to the amplitude ratios measured by HERMES.