$C$ Violation in Electromagnetic Interactions

We have considered the reactions $e^{+}+e^{-}\to {\rho }^0+\gamma$ and $e^{+}+e^{-}\to {\mu }^{+}+{\mu }^{-}+\gamma$ with a view to detecting $p\gamma \gamma$ and $\gamma \gamma \gamma$ vertices. It is found that, depending on the nature of the form factors involved in these vertices, there could be substantial deviation from the normal cross section at energies available in the present-day colliding-beam machines.