  We apply a dynamical three-constituent quark light-front model to study the
proton. The dynamics is based on the notion of a diquark (bound or virtual) as
the dominant interaction channel, which paramaterizes a contact interaction
between the quarks in order to build the three-body Faddeev Bethe-Salpeter
equations for the valence state, and we focus on the totally symmetric part of
the wave function. The Dirac electromagnetic form factor is used to fix the
model parameters, and the valence wave function is obtained. From that we
investigate its Ioffe-time image, non-polarized longitudinal and transverse
momentum distributions, and the double momentum distribution.
