Two-Photon Processes for Particle Production at High Energies

The literature of the past three years on the two-photon process for particle production $e^{\pm }+e^{-}\to e^{\pm }+{\gamma }^{*}+e^{-}+{\gamma }^{*}\to e^{\pm }+e^{-}+X$ (where $X$ is any $C=+\mathrm{state}$) or $p+p\to X_1+{\gamma }^{*}+X_2+{\gamma }^{*}\to X_1+X_2+{\mu }^{+}+{\mu }^{-}$ (where $X_1$,$X_2$ are hadron states) is reviewed in some detail. Both the theoretical aspects and the experimental feasibility of various processes are discussed especially for experimentalists' convenience.