Pion decay constant, electromagnetic form factor, and quark electromagnetic self-energy in quantum chromodynamics

We examine dynamical chiral symmetry breaking in quantum chromodynamics (QCD). To lowest order in a double perturbation expansion in g, the gauge coupling, and =exp (-1b{g^2}) we obtain exact representations for the pion decay constant f_ and electromagnetic form factor F_ (q^2). Using the experimental values for f_ and F_ (q^2), we estimate the dynamically generated quark mass to be 270-300 MeV, in good agreement with a value obtained from e^+e^- annihilation data. We also calculate the finite electromagnetic self-energy of a quark in QCD and discuss the implications.