HERMES impact for the access of Compton form factors

TL;DR

This paper uses HERMES DVCS measurements to extract Compton form factors, providing a detailed mapping of asymmetries into the GPD space and comparing different fitting approaches.

Contribution

It introduces a method to map DVCS asymmetries into Compton form factors using nearly complete measurements, emphasizing twist-two dominance and comparing various fitting techniques.

Findings

Successful mapping of asymmetries into Compton form factors

Comparison of local fits and global model-dependent fits

Confirmation of twist-two dominance in the analysis

Abstract

We utilize the DVCS asymmetry measurements of the HERMES collaboration for access to Compton form factors in the deeply virtual regime and to generalized parton distributions. In particular, the (almost) complete measurement of DVCS observables allows us to map various asymmetries into the space of Compton form factors, where we still rely in this analysis on dominance of twist-two associated Compton form factors. We compare this one-to-one map with local Compton form factor fits and a model dependent global fit.