Bound on theW-boson electric dipole moment

A $W$-boson electric dipole moment $\frac{{\lambda }_{W}e}{2m_W}$ can induce fermion electric dipole moments via quantum loop corrections. Updating an analysis by Salzman and Salzman, we estimate this effect and find that the current neutron-electric-dipole-moment bound $\left|d_n\right|<\mathrm{}6\mathrm{}\times {10}^{-25\mathrm{}}$ e cm implies (barring an unforeseen cancellation) $\left|{\lambda }_W\right|<\mathrm{}1\mathrm{}\times {10}^{-3\mathrm{}}$ or $\left|d_W\right|<\mathrm{}{10}^{-19\mathrm{}}$ e cm. On the basis of this constraint, we conclude that electricdipole-moment contributions to radiative $W$-boson processes must be very small and effectively undetectable.