Perturbative QCD analysis of exclusive pair production of higher-generation nucleons

Results are presented of a perturbative QCD analysis of heavy-baryon form factors to leading order in ${\alpha }_s$ including all higher-twist quark-mass effects. A dip in the total cross section for the $e^{+}$ $e^{\mathrm{-}}$ pair production of some higher-generation nucleons is predicted. The results are consistent with the definition of charge form factors at zero momentum transfer and reproduce the well-known anomalous magnetic moments of nucleons. These considerations resolve a sign ambiguity in previous leading-twist analyses of the hard-scattering contribution to the proton magnetic form factor.