Electron-positron annihilation into heavy leptons at two loops

Roman E. Gerasimov, Petr A. Krachkov, Roman N. Lee

We calculate the NNLO QED corrections to the $C$-even part of differential cross section of $e^{+}{e}^{-}\to {\mu }^{+}{\mu }^{-}$ process. We neglect power corrections in the electron mass and obtai…