Generalized parton distributions at zero skewness

• Muhammad Goharipour (School of Particles and Accelerators, IPM)

In this study, we present a new determination of the generalized parton distributions (GPDs) with their uncertainties at zero skewness, $\xi=0$, through a simultaneous analysis of all available experimental data of the nucleon electromagnetic form factors (FFs), nucleon charge and magnetic radii, proton axial FF (AFF), and wide-angle Compton scattering (WACS) cross section for the first time. This can be considered as the most comprehensive analysis of GPDs at $\xi=0$ performed so far. We show that such an analysis provides the simultaneous determination of three kinds of GPDs, namely $H^q$, $\tilde{H}^q$ and $E^q$, considering also the sea quark contributions. As a result, we find that the inclusion of the WACS and AFF data at larger values of the momentum transfer squared can put new constrains on GPDs and change them drastically in some cases. We also indicate that the results for the gravitational $FF$ $M_2$ and the proton total angular momentum $J^p$ calculated using the extracted GPDs are in more agreement with the light-cone QCD sum rules (LCSR) and lattice QCD predictions when all experimental data are included in the analysis simultaneously and the sea quark contributions are considered. This talk is based on arXiv:2211.09522 [hep-ph].