$2\gamma$ and $3\gamma$ annihilation as calibration processes for high energy $e^{+}{e}^{-}$ colliders

E. Bartos, S. Bakmaev, E. A. Kuraev +2

Born differential cross sections and the lowest-order radiative correction to them are obtained in the kinematics of large-angle final photons emission in high-energy electron-posi…