Impact of a positron beam at JLab on an unbiased determination of DVCS Compton Form Factors

TL;DR

This paper assesses how future positron beam measurements at JLab could enhance the unbiased determination of Compton form factors, crucial for understanding proton structure.

Contribution

It introduces a Bayesian reweighting approach to quantify the impact of proposed measurements on Compton form factor uncertainties.

Findings

Future measurements could significantly improve the determination of the real part of the Compton form factor.

Enhanced form factor knowledge aids in understanding proton mechanical properties.

Results support the value of positron beams for GPD studies.

Abstract

The impact of potential future measurements of beam charge asymmetries on the current knowledge of Compton form factors is evaluated. Elaborating on the results of a global neural network fit to deeply virtual Compton scattering data, a Bayesian reweighting analysis quantifies the improved determination of the real part of the Compton form factor $\mathcal{H}$. Such an improvement is particularly relevant for the experimental determination of the proton mechanical properties or for universality studies of generalized parton distributions through analyses of virtual Compton scattering in both spacelike and timelike regions.