Magnetic Dipole and Electric Quadrupole Moments of theW±Meson

It is shown that the magnetic dipole and the electric quadrupole moments of the $W^{\pm }$ meson must be equal to $\frac{e}{m}$ and $-\frac{e}{m^2}$, respectively, if we demand either that the Drell-Hearn sum rule is satisfied up to order ${\alpha }^2$ or that the helicity of $W^{\pm }$ is conserved in the scattering from an arbitrary electromagnetic field at high energies and at small but finite scattering angles.