2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/46210Dyon loops give a contribution to the matrix element for light-by-light scattering that violates parity and time-reversal symmetry. This effect induces an electric dipole moment for the electron, of order $M^{-2}$, where $M$ is the dyon mass. The current limit on the electric dipole moment of the electron yields the lower mass bound $M>{\cal O}(1)~\mbox{TeV}$.LaTeX + 1 figure as uuencoded PostScript fileHigh Energy Physics - PhenomenologyAtomic Physicstext