The rainbow truncation of the quark Dyson-Schwinger equation is combined with the ladder Bethe-Salpeter equation for the dressed quark-photon vertex to study the low-momentum behavior of the pion electromagnetic form factor. With model gluon parameters previously fixed by the pion mass and decay constant, the pion charge radius r_π is found to be in good agreement with the data. In this work, about half of r_π² is seen to be attributable to the presence of the ρ pole in the solution of the ladder Bethe-Salpeter equation.
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Maris et al. (2000) studied this question.
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