Radiative correction to the charge asymmetry in $e^{+}{e}^{-}\to {\mu }^{+}{\mu }^{-}$ process

We calculate the next-to-next-to-leading order (NNLO) QED corrections to the $C$-odd part of the differential cross section of the $e^{+}{e}^{-}\to {\mu }^{+}{\mu }^{-}$ process. This part contributes to the angular and forward-backward asymmetry. Together with our earlier paper [10.1007/JHEP08(2025)118], this work completes the analytical calculation of $e^{+}{e}^{-}\to {\mu }^{+}{\mu }^{-}$ differential cross section at NNLO.