Dyon mass bounds from electric dipole moments

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Dyon 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> O(1) TeV.