  Recently the concept of quasi parton distributions (quasi-PDFs) for hadrons
has been proposed. Quasi-PDFs are defined through spatial correlation functions
and as such can be computed numerically using quantum chromodynamics on a
four-dimensional lattice. As the hadron momentum is increased, the quasi-PDFs
converge to the corresponding standard PDFs that appear in factorization
theorems for many high-energy scattering processes. Here we investigate this
new concept in the case of generalized parton distributions (GPDs) by
calculating the twist-2 vector GPDs in the scalar diquark spectator model. For
infinite hadron momentum, the analytical results of the quasi-GPDs agree with
those of the standard GPDs. Our main focus is to examine how well the
quasi-GPDs agree with the standard GPDs for finite hadron momenta. We also
study the sensitivity of the results on the parameters of the model. In
general, our model calculation suggests that quasi-GPDs could be a viable tool
for getting information about standard GPDs.
