Inelastice−pScattering and the Polarization Contribution to H Hyperfine Structure

We use the structure functions obtained from a specific resonance model of inelastic $e-p$ scattering to evaluate the polarizability correction to the ground-state hyperfine splitting of hydrogen. By requiring that the spin-flip amplitude for real Compton scattering satisfy the Drell-Hearn sum rule, we can fix the only free parameter in the model. We find that the polarizability corrections are approximately 1 ppm, in good agreement with the existing bounds on the uncertainty of quantum-electrodynamic calculations of hyperfine structure.