Extraction of the Compton Form Factor H from DVCS Measurements in the Quark Sector

TL;DR

This paper extracts the real and imaginary parts of the Compton Form Factor H from various Deeply Virtual Compton Scattering measurements, providing insights into the quark sector with systematic error analysis.

Contribution

It introduces a method to extract the CFF H from multiple experimental data sets, emphasizing systematic error estimation and comparison with theoretical models.

Findings

Real and imaginary parts of H extracted with 20-50% uncertainty

Results compared with VGG model and previous extractions

Systematic errors carefully estimated and discussed

Abstract

Working at twist 2 accuracy and assuming the dominance of the Generalized Parton Distribution H we study the helicity-dependent and independent cross sections measured in Hall A, the beam spin asymmetries measured in Hall B at Jefferson Laboratory and beam charge, beam spin and target spin asymmetries measured by Hermes. We extract the real and imaginary parts of the Compton Form Factor H, the latter being obtained with a 20--50% uncertainty. We pay extra attention to the estimation of systematic errors on the extraction of H. We discuss our results and compare to other extractions as well as to the popular VGG model.