Extraction of the Compton Form Factor H from DVCS measurements at Jefferson Lab

TL;DR

This paper extracts the real and imaginary parts of the Compton Form Factor H from DVCS measurements at Jefferson Lab using a global fit within the GPD framework, providing insights into nucleon structure.

Contribution

It presents a novel global fitting method to extract the Compton Form Factor H from DVCS data, with detailed error analysis and comparison to models.

Findings

Successful extraction of the real and imaginary parts of H

Comparison shows consistency with previous results and models

Enhanced understanding of GPD H in nucleon structure

Abstract

In the framework of Generalised Parton Distributions, we study the helicity-dependent and independent cross sections measured in Hall A and the beam spin asymmetries measured in Hall B at Jefferson Laboratory. We perform a global fit of these data and fits on each kinematical bin. We extract the real and imaginary parts of the Compton Form Factor $\mathcal{H}$ under the main hypothesis of dominance of the Generalised Parton Distribution $H$ and twist 2 accuracy. We discuss our results and compare to previous extractions as well as to the VGG model. We pay extra attention to the estimation of errors on the extraction of $\mathcal{H}$.