  The effect of the self-energy on the photon-proton elastic scattering is
investigated for the backward and the forward directions. The shape of the
Thomson scattering at the photon energy $\omega \to 0$ is broken by taking into
account the self-energy of proton. The electromagnetic polarizabilities
$\bar{\alpha}\pm\bar{\beta}$ are calculated by the lowest-order perturbative
treatment.
