  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 FFs (AFFs) and
wide-angle Compton scattering (WACS) cross sections for the first time, and we
investigate whether there is any tension between these data. This can be
considered 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 $, $ \widetilde{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 $ Q^2=-t $ can put new constraints on GPDs and change them drastically
in some cases. We show that there is a considerable tension between the WACS
and the proton magnetic form factor ($ G_M^p $) data, especially at larger
values of $ -t $. However, we 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 relatively good agreement with the light-cone QCD sum
rules (LCSRs) and lattice QCD predictions when the sea-quark contributions are
considered and both WACS and $ G_M^p $ data are included in the analyses
simultaneously.
