Abstract
The convergence properties of a simple model for the nucleon quark distribution amplitude into Appell polynomials are studied and the model is used to calculate nucleon form factors in perturbative QCD. Treating the gluon propagator and the strong coupling [alpha][sub [ital S]] in various ways, we demonstrate that the freedom left in the unknown [ital [rvec k]][sub [perpendicular]] dependence of the full wave function is large enough to account for a wide range of form factor results. This is interpreted as a hint that higher-twist effects may give significant contributions to hadronic form factors in PQCD. Additionally, we find a ratio of [vert bar][ital F][sub 1][sup [ital n]]/[ital F][sub 1][sup [ital p]][vert bar][approx]1/2 at large momentum transfers.
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